# Specific Heat Capacity and Latent Heat Questions A2 Physics

Size: px
Start display at page:

Transcription

1 1. An electrical heater is used to heat a 1.0 kg block of metal, which is well lagged. The table shows how the temperature of the block increased with time. temp/ C time/s (a) Plot a graph of temperature against time on the graph paper provided. (b) (c) (d) adequate scale (1 mark) filling the paper points plotted correctly (1 mark) best fit line (at least a point to right and left of line) (1 mark) Determine the gradient of the graph. Clearly marked, use of triangle minimum size 8cm (1 mark) gradient = ( C/s) (1 mark) The heater provides thermal energy at the rate of 48 W. Use your value for the gradient of the graph to determine a value for the specific heat capacity of the metal in the block. mcδθ = Q = Pt mc(δθ/t) = P c = P/(m x gradient of the graph) = 48/0.056 c = J kg 1 K 1 (or J kg 1 C 1 ) (1 mark) The heater in part (c) is placed in some crushed ice that has been placed in a funnel as shown. The heater is switched on for 200 s and 32 g of ice are found to have melted during this time. Use this information to calculate a value for the specific latent heat of fusion for water, stating one assumption made. Q = Pt = ml 48 x 200 = 32 x 10 3 x l (1 mark) h e a t e r l = 3.0 x 10 5 J kg 1 (1 mark) Any sensible assumption, e.g. no heat lost to surroundings or temperature does not change or all heat is transferred to ice (1 mark) (3) (Total 10 marks) (3) (2) (2) c r u s h e d i c e LOJ 2010 cyberphysics.co.uk 1

2 Q2 (a) A student immerses a 2.0kW electric heater in an insulated beaker of water. The heater is switched on and after 120 s the water reaches boiling point. The data collected during the experiment is given below. initial mass of beaker 25 g initial mass of beaker and water 750 g initial temperature of water 20 C final temperature of water 100 C the specific heat capacity of water if the thermal capacity of the beaker is negligible. mcδθ = Q = Pt c (100 20) (1 mark) = (1 mark) c = 4100 (1 mark) J kg 1 (1 mark) (b) The student in part (a) continues to heat the water so that it boils for 105 s. When the mass ofthe beaker and water is measured again, it is found that it has decreased by 94 g. (i) a value for the specific latent heat of vaporisation of water. Q = ml = Pt x l = (1 mark) l = J kg 1 (1 mark) (ii) State two assumptions made in your calculation. no evaporation (before water heated to boiling point) (1 mark) no heat lost (to the surroundings) (1 mark) heater 100% efficient (1 mark) - any two Q3 A tray containing 0.20 kg of water at 20 C is placed in a freezer. (a) The temperature of the water drops to 0 C in 10 minutes. specific heat capacity of water = 4200 J kg -1 K 1 (i) the energy lost by the water as it cools to 0 C, energy lost by water = (1 mark) (b) = J (1 mark) [1.68 x 10 4 J] (ii) the average rate at which the water is losing energy, in J s 1. rate of loss of energy = (1.68 x 10 4 )/(10 x 60) = 28W (1 mark) (i) Estimate the time taken for the water at 0 C to turn completely into ice. specific latent heat of fusion of water = 3.3 x 10 5 J kg 1 ΔQ = ml = Pt (28 t) = (1 mark) [8 marks] t = s (1 mark) ( s) (ii) State any assumptions you make. constant rate of heat loss (1 mark) ice remains at 0oC (1 mark) Q4 (a) A 2.0kW heater is used to heat a room from 5 C to 20 C. The mass of air in the room is 30 kg. Under these conditions the specific heat capacity of air = 1000 J kg -1 K -1. LOJ 2010 cyberphysics.co.uk 2

3 (i) the gain in thermal energy of the air, Q = = J(1 mark) (ii) the minimum time required to heat the room. P t = 4.5 x 10 5 (1 mark) t = 45 x 10 5 /2000 = 225 s (1 mark) (b) State and explain one reason why the actual time taken to heat the room is longer than the value calculated in part (a)(ii). Heat is lost to surroundings or other objects in room or to heater itself(1 mark) therefore more (thermal) energy is required from heater (1 mark) [or because convection currents cause uneven heating or rate of heat transfer decreases as temperature increases] Q5. A bicycle and its rider have a total mass of 95 kg. The bicycle is travelling along a horizontal road at a constant speed of 8.0ms -1. (a) the kinetic energy of the bicycle and rider. Ek = ½mv 2 Ek = ½ x 95 x (1 mark) = 3040 J (1 mark) (b) The brakes are applied until the bicycle and rider come to rest. During braking, 60% of the kinetic energy of the bicycle and rider is converted to thermal energy in the brake blocks. The brake blocks have a total mass of 0.12 kg and the material from which they are made has a specific heat capacity of 1200 J kg -1 K -1. (i) the maximum rise in temperature of the brake blocks. 60% of the KE = 0.60 x 3040 = 1824 (J) (1 mark) Q = mc 1824 = 0.12 x 1200 x (1 mark) = 13 K (1 mark) (12.7 K) (ii) State an assumption you have made in part (b)(i). No heat is lost to the surroundings (1 mark) Q6. A female runner of mass 60 kg generates thermal energy at a rate of 800W. (a) Assuming that she loses no energy to the surroundings and that the average specific heat capacity of her body is 3900 J kg -1 K -1, calculate (i) the thermal energy generated in one minute, Energy in one minute = = J(1 mark) (ii) the temperature rise of her body in one minute = Δθ (1 mark) Δθ = 0.21 K (1 mark) (0.205 K) LOJ 2010 cyberphysics.co.uk 3

4 (b) In practice it is desirable for a runner to maintain a constant temperature. This may be achieved partly by the evaporation of sweat. The runner in part (a) loses energy at a rate of 500W by this process. the mass of sweat evaporated in one minute. specific latent heat of vaporisation of water = 2.3 x 10 6 J kg -1 ΔQ = ml Energy in one minute: (1 mark) = m (1 mark) So m = kg (1 mark) (c) Explain why, when she stops running, her temperature is likely to fall. She is not generating as much heat internally (1 mark) but is still losing heat (at the same rate) [or still sweating] (1 mark) hence her temperature will drop (1 mark) [8 marks] Q7. The diagram on the right shows a tube containing small particles of lead. When the tube is inverted the particles of lead fall freely through a vertical height equal to the length of the tube. (a) Describe the energy changes that take place in the lead particles during one inversion of the tube. Lead particles fall and lose potential energy (as tube is inverted) (1 mark). This is converted to kinetic energy (1 mark).kinetic energy is converted into heat energy on impact (1 mark) (b) The tube is made from an insulating material and is used in an experiment to determine the specific heat capacity of lead. The following results are obtained. mass of lead: kg number of inversions: 50 length of tube: 1.2m change in temperature of the lead: 4.5K (i) (ii) (iii) the change in potential energy of the lead as it falls after one inversion down the tube, Ep = mgh = = 0.29(4) J (1 mark) the total change in potential energy after 50 inversions, total change of energy (= ) = 15 J (1 mark) (14.7 J) (use of 0.29 gives 14.(5) J) the specific heat capacity of the lead = c 4.5 (1 mark) c = 131 J kg 1 K 1 (1 mark) (130.7 J kg 1 K 1 ) (use of 15 from (ii) gives 133 J kg 1 K 1 ) [7 marks] LOJ 2010 cyberphysics.co.uk 4

5 Q8. In an experiment to measure the temperature of the flame of a Bunsen burner, a lump of copper of mass 0.12 kg is heated in the flame for several minutes. The copper is then transferred quickly to a beaker, of negligible heat capacity, containing 0.45 kg of water, and the temperature rise of the water measured. specific heat capacity of water = 4200 J kg -1 K -1 specific heat capacity of copper = 390 J kg -1 K -1 (a) If the temperature of the water rises from 15 C to 35 C, calculate the thermal energy gained by the water. ΔQ = mcδ (1 mark) ΔQ = (35 15) = J (1 mark) ( J ) (b) (i) State the thermal energy lost by the copper, assuming no heat is lost during its transfer J (1 mark) (ii) the fall in temperature of the copper. mcδt = ΔQ ΔT = (1 mark) ΔT = 812 K (1 mark) use of ΔQ =3.78 x 10 4 J gives ΔT = 808 K (iii) Hence calculate the temperature reached by the copper while in the flame. ( ) = 847 ºC (1 mark) (use of 808 gives 843 ºC) (6 marks) Q9. (a) the energy released when 1.5 kg of water at 18 C cools to 0 C and then freezes to form ice, also at 0 C. specific heat capacity of water = 4200 J kg -1 K -1 specific latent heat of fusion of ice = J kg -1 Water cooling to zero ΔQ = mct ΔQ 1 = (1 mark) = (J) (1 mark) Ice forming Δ Q 2 = = (J) (1 mark) total energy released (= ) = J(1 mark) (b) Explain why it is more effective to cool cans of drinks by placing them in a bucket full of melting ice rather than in a bucket of water at an initial temperature of 0 C. Ice requires an input of latent heat energy to melt (1 mark). It therefore takes this energy from the drink before the drink begins to take energy from the melted ice. It therefore stays at 0 ºC for longer that it would in the cold water (1 mark) (6 marks) (63 marks Total) LOJ 2010 cyberphysics.co.uk 5

### FXA 2008. Candidates should be able to : Define and apply the concept of specific heat capacity. Select and apply the equation : E = mcδθ

UNIT G484 Module 3 4.3.3 Thermal Properties of Materials 1 Candidates should be able to : Define and apply the concept of specific heat capacity. Select and apply the equation : E = mcδθ The MASS (m) of

### Energy Matters Heat. Changes of State

Energy Matters Heat Changes of State Fusion If we supply heat to a lid, such as a piece of copper, the energy supplied is given to the molecules. These start to vibrate more rapidly and with larger vibrations

### Type: Single Date: Homework: READ 12.8, Do CONCEPT Q. # (14) Do PROBLEMS (40, 52, 81) Ch. 12

Type: Single Date: Objective: Latent Heat Homework: READ 12.8, Do CONCEPT Q. # (14) Do PROBLEMS (40, 52, 81) Ch. 12 AP Physics B Date: Mr. Mirro Heat and Phase Change When bodies are heated or cooled their

### Practical Applications of Freezing by Boiling Process

Practical Applications of Freezing by Boiling Process Kenny Gotlieb, Sasha Mitchell and Daniel Walsh Physics Department, Harvard-Westlake School 37 Coldwater Canyon, N. Hollywood, CA 9164 Introduction

### Experiment 1: Colligative Properties

Experiment 1: Colligative Properties Determination of the Molar Mass of a Compound by Freezing Point Depression. Objective: The objective of this experiment is to determine the molar mass of an unknown

### UNIT 6a TEST REVIEW. 1. A weather instrument is shown below.

UNIT 6a TEST REVIEW 1. A weather instrument is shown below. Which weather variable is measured by this instrument? 1) wind speed 3) cloud cover 2) precipitation 4) air pressure 2. Which weather station

### Topic Page Contents Page

Heat energy (11-16) Contents Topic Page Contents Page Heat energy and temperature 3 Latent heat energy 15 Interesting temperatures 4 Conduction of heat energy 16 A cooling curve 5 Convection 17 Expansion

### The final numerical answer given is correct but the math shown does not give that answer.

Note added to Homework set 7: The solution to Problem 16 has an error in it. The specific heat of water is listed as c 1 J/g K but should be c 4.186 J/g K The final numerical answer given is correct but

### Physics Intermediate 2

Physics Intermediate 2 Physics: Intermediate 2 1 MECHANICS AND HEAT The knowledge and understanding for this unit is given below. Kinematics 1. Describe how to measure an average speed. 2. Carry out calculations

### Worksheet #17. 2. How much heat is released when 143 g of ice is cooled from 14 C to 75 C, if the specific heat capacity of ice is 2.087 J/(g C).

Worksheet #17 Calculating Heat 1. How much heat is needed to bring 12.0 g of water from 28.3 C to 43.87 C, if the specific heat capacity of water is 4.184 /(g? 2. How much heat is released when 143 g of

1/7 2009/11/14 上 午 11:10 Manage this Assignment: Chapter 16 Due: 12:00am on Saturday, July 3, 2010 Note: You will receive no credit for late submissions. To learn more, read your instructor's Grading Policy

### Gravitational Potential Energy

Gravitational Potential Energy Consider a ball falling from a height of y 0 =h to the floor at height y=0. A net force of gravity has been acting on the ball as it drops. So the total work done on the

### Name: Class: Date: 10. Some substances, when exposed to visible light, absorb more energy as heat than other substances absorb.

Name: Class: Date: ID: A PS Chapter 13 Review Modified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true. 1. In all cooling

### SUGGESTED ACTIVITIES

SUGGESTED ACTIVITIES (Thermal Energy) From Invitations to Science Inquiry 2 nd Edition by Tik L. Liem: Activity Page Number Concept Warm a Bottle by Shaking 184 Heat, Friction The Confused Bottles 206

### 1. The Kinetic Theory of Matter states that all matter is composed of atoms and molecules that are in a constant state of constant random motion

Physical Science Period: Name: ANSWER KEY Date: Practice Test for Unit 3: Ch. 3, and some of 15 and 16: Kinetic Theory of Matter, States of matter, and and thermodynamics, and gas laws. 1. The Kinetic

### Specific Heat (slope and steepness)

1 Specific Heat (slope and steepness) 10 pages. According to the Physical Science text book, the Specific Heat of a material is DEFINED as the following: Specific heat is the amount of heat energy required

### MIT 2.810 Manufacturing Processes and Systems. Homework 6 Solutions. Casting. October 15, 2015. Figure 1: Casting defects

MIT 2.810 Manufacturing Processes and Systems Casting October 15, 2015 Problem 1. Casting defects. (a) Figure 1 shows various defects and discontinuities in cast products. Review each one and offer solutions

### Phys222 W11 Quiz 1: Chapters 19-21 Keys. Name:

Name:. In order for two objects to have the same temperature, they must a. be in thermal equilibrium.

### AS COMPETITION PAPER 2007 SOLUTIONS

AS COMPETITION PAPER 2007 Total Mark/50 SOLUTIONS Section A: Multiple Choice 1. C 2. D 3. B 4. B 5. B 6. A 7. A 8. C 1 Section B: Written Answer Question 9. A mass M is attached to the end of a horizontal

### Chapter 10 Temperature and Heat

Chapter 10 Temperature and Heat GOALS When you have mastered the contents of this chapter, you will be able to achieve the following goals: Definitions Define each of the following terms, and use it an

### Chapter 10 Temperature and Heat

Chapter 10 Temperature and Heat What are temperature and heat? Are they the same? What causes heat? What Is Temperature? How do we measure temperature? What are we actually measuring? Temperature and Its

### Temperature. Temperature

Chapter 8 Temperature Temperature a number that corresponds to the warmth or coldness of an object measured by a thermometer is a per-particle property no upper limit definite limit on lower end Temperature

### A n = 2 to n = 1. B n = 3 to n = 1. C n = 4 to n = 2. D n = 5 to n = 2

North arolina Testing Program EO hemistry Sample Items Goal 4 1. onsider the spectrum for the hydrogen atom. In which situation will light be produced? 3. Which color of light would a hydrogen atom emit

### REASONING AND SOLUTION

39. REASONING AND SOLUTION The heat released by the blood is given by Q cm T, in which the specific heat capacity c of the blood (water) is given in Table 12.2. Then Therefore, T Q cm 2000 J 0.8 C [4186

### Materials 10-mL graduated cylinder l or 2-L beaker, preferably tall-form Thermometer

VAPOR PRESSURE OF WATER Introduction At very low temperatures (temperatures near the freezing point), the rate of evaporation of water (or any liquid) is negligible. But as its temperature increases, more

### Why hot water freezes faster than cold water

Why hot water freezes faster than cold water By Daniel Muthukrishna Undergraduate Engineering/Physics Student at the University of Queensland Images also produced by Daniel Muthukrishna Some of the main

### To measure the solubility of a salt in water over a range of temperatures and to construct a graph representing the salt solubility.

THE SOLUBILITY OF A SALT IN WATER AT VARIOUS TEMPERATURES 2007, 1995, 1991 by David A. Katz. All rights reserved. Permission for academic use provided the original copyright is included. OBJECTIVE To measure

### Triple Point Experiment

Equipment List Rotary vane vacuum pump 2-stage, 2 to 7 CFM. For example, Edwards 2M2 (2 CFM), Edwards RV5 (3.5 CFM), Edwards E2M8 (6.7 CFM) or equivalent. Bell jar Nalgene polycarbonate plastic, 5-5/8

### Chemistry 212 VAPOR PRESSURE OF WATER LEARNING OBJECTIVES

Chemistry 212 VAPOR PRESSURE OF WATER LEARNING OBJECTIVES The learning objectives of this experiment are to explore the relationship between the temperature and vapor pressure of water. determine the molar

### MCQ - ENERGY and CLIMATE

1 MCQ - ENERGY and CLIMATE 1. The volume of a given mass of water at a temperature of T 1 is V 1. The volume increases to V 2 at temperature T 2. The coefficient of volume expansion of water may be calculated

### Refrigeration Basics 101. By: Eric Nelson

Refrigeration Basics 101 By: Eric Nelson Basics Refrigeration is the removal of heat from a material or space, so that it s temperature is lower than that of it s surroundings. When refrigerant absorbs

### How To Understand Evaporator

SECTION 5 COMMERCIAL REFRIGERATION UNIT 21 EVAPORATORS AND THE REFRIGERATION SYSTEM UNIT OBJECTIVES After studying this unit, the reader should be able to Define high-, medium-, and low-temperature refrigeration.

### Chapter 10: Temperature and Heat

Chapter 10: Temperature and Heat 1. The temperature of a substance is A. proportional to the average kinetic energy of the molecules in a substance. B. equal to the kinetic energy of the fastest moving

### Weight The weight of an object is defined as the gravitational force acting on the object. Unit: Newton (N)

Gravitational Field A gravitational field as a region in which an object experiences a force due to gravitational attraction Gravitational Field Strength The gravitational field strength at a point in

### AQA Level 1/2 Certificate in Physics PAPER 1 SPECIMEN MARK SCHEME. AQA Level 1/2 Certificate in Physics Paper 1 MS

AQA Level /2 Certificate in Physics PAPER SPECIMEN MARK SCHEME AQA Level /2 Certificate in Physics Paper MS MARK SCHEME Information to Examiners. General The mark scheme for each question shows: the marks

### Experiment 12E LIQUID-VAPOR EQUILIBRIUM OF WATER 1

Experiment 12E LIQUID-VAPOR EQUILIBRIUM OF WATER 1 FV 6/26/13 MATERIALS: PURPOSE: 1000 ml tall-form beaker, 10 ml graduated cylinder, -10 to 110 o C thermometer, thermometer clamp, plastic pipet, long

### Unit 3: States of Matter Practice Exam

Page 1 Unit 3: States of Matter Practice Exam Multiple Choice. Identify the choice that best completes the statement or answers the question. 1. Two gases with unequal masses are injected into opposite

### 1. At which temperature would a source radiate the least amount of electromagnetic energy? 1) 273 K 3) 32 K 2) 212 K 4) 5 K

1. At which temperature would a source radiate the least amount of electromagnetic energy? 1) 273 K 3) 32 K 2) 212 K 4) 5 K 2. How does the amount of heat energy reflected by a smooth, dark-colored concrete

### 14 HEAT AND HEAT TRANSFER METHODS

CHAPTER 14 HEAT AND HEAT TRANSFER METHODS 469 14 HEAT AND HEAT TRANSFER METHODS Figure 14.1 (a) The chilling effect of a clear breezy night is produced by the wind and by radiative heat transfer to cold

### CHAPTER 14 THE CLAUSIUS-CLAPEYRON EQUATION

CHAPTER 4 THE CAUIU-CAPEYRON EQUATION Before starting this chapter, it would probably be a good idea to re-read ections 9. and 9.3 of Chapter 9. The Clausius-Clapeyron equation relates the latent heat

### TEACHER BACKGROUND INFORMATION THERMAL ENERGY

TEACHER BACKGROUND INFORMATION THERMAL ENERGY In general, when an object performs work on another object, it does not transfer all of its energy to that object. Some of the energy is lost as heat due to

### 5. Which temperature is equal to +20 K? 1) 253ºC 2) 293ºC 3) 253 C 4) 293 C

1. The average kinetic energy of water molecules increases when 1) H 2 O(s) changes to H 2 O( ) at 0ºC 3) H 2 O( ) at 10ºC changes to H 2 O( ) at 20ºC 2) H 2 O( ) changes to H 2 O(s) at 0ºC 4) H 2 O( )

### Q1. A student studied the reaction between dilute hydrochloric acid and an excess of calcium carbonate.

Q. A student studied the reaction between dilute hydrochloric acid and an excess of calcium carbonate. calcium carbonate + hydrochloric acid calcium chloride + water + carbon dioxide The student measured

### HEAT AND CONSERVATION OF ENERGY

1 HEAT AND CONSERVATION OF ENERGY I. INTRODUCTION A. Overview of the Unit In this unit students develop a model for the conservation of energy that is built from a variety of investigations utilizing fairly

### Rusty Walker, Corporate Trainer Hill PHOENIX

Refrigeration 101 Rusty Walker, Corporate Trainer Hill PHOENIX Compressor Basic Refrigeration Cycle Evaporator Condenser / Receiver Expansion Device Vapor Compression Cycle Cooling by the removal of heat

### Pre-Lab Notebook Content: Your notebook should include the title, date, purpose, procedure; data tables.

Determination of Molar Mass by Freezing Point Depression M. Burkart & M. Kim Experimental Notes: Students work in pairs. Safety: Goggles and closed shoes must be worn. Dispose of all chemical in the plastic

### POURING THE MOLTEN METAL

HEATING AND POURING To perform a casting operation, the metal must be heated to a temperature somewhat above its melting point and then poured into the mold cavity to solidify. In this section, we consider

### GCSE COMBINED SCIENCE: TRILOGY

GCSE COMBINED SCIENCE: TRILOGY Higher Tier Paper 5: Physics 1H H Specimen 2018 Time allowed: 1 hour 15 minutes Materials For this paper you must have: a ruler a calculator the Physics Equation Sheet (enclosed).

### M SERIES REFRIGERANT COIL MODULE REFRIGERANT COILS for R-22, R-407C, R-410A

Bulletin 20-20.2 / July 2012 M SERIES REFRIGERANT COIL MODULE REFRIGERANT COILS for R-22, R-407C, R-410A ➀ ➁ ➂ Model Number Key M 2430 C L 1 - A - ➀ Unit Type M=Modular Nominal Capacity 2430=24000 to 30000

### Saeid Rahimi. Effect of Different Parameters on Depressuring Calculation Results. 01-Nov-2010. Introduction. Depressuring parameters

Effect of Different Parameters on Depressuring Calculation Results Introduction Saeid Rahimi 01-Nov-2010 Emergency depressuring facilities are utilized to accomplish at least one of the following objectives:

### SOLUBILITY OF A SALT IN WATER AT VARIOUS TEMPERATURES LAB

SOLUBILITY OF A SALT IN WATER AT VARIOUS TEMPERATURES LAB Purpose: Most ionic compounds are considered by chemists to be salts and many of these are water soluble. In this lab, you will determine the solubility,

### THE PSYCHROMETRIC CHART: Theory and Application. Perry Peralta NC State University

THE PSYCHROMETRIC CHART: Theory and Application Perry Peralta NC State University PSYCHROMETRIC CHART Identify parts of the chart Determine moist air properties Use chart to analyze processes involving

### Kinetic Theory & Ideal Gas

1 of 6 Thermodynamics Summer 2006 Kinetic Theory & Ideal Gas The study of thermodynamics usually starts with the concepts of temperature and heat, and most people feel that the temperature of an object

### Test 5 Review questions. 1. As ice cools from 273 K to 263 K, the average kinetic energy of its molecules will

Name: Thursday, December 13, 2007 Test 5 Review questions 1. As ice cools from 273 K to 263 K, the average kinetic energy of its molecules will 1. decrease 2. increase 3. remain the same 2. The graph below

### Energy and Energy Transformations Test Review

Energy and Energy Transformations Test Review Completion: 1. Mass 13. Kinetic 2. Four 14. thermal 3. Kinetic 15. Thermal energy (heat) 4. Electromagnetic/Radiant 16. Thermal energy (heat) 5. Thermal 17.

### GATEWAY SCIENCE B651/01 PHYSICS B Unit 1 Modules P1 P2 P3 (Foundation Tier)

F GENERAL CERTIFICATE OF SECONDARY EDUCATION GATEWAY SCIENCE B651/01 PHYSICS B Unit 1 Modules P1 P2 P3 (Foundation Tier) *CUP/T63931* Candidates answer on the question paper A calculator may be used for

### Scholars Research Library

Available online at www.scholarsresearchlibrary.com Scholars Research Library Archives of Physics Research, 2010, 1 (2):103-111 (http://scholarsresearchlibrary.com/archive.html) ISSN 0976-0970 Lubricating

### Freezing Point Depression: Why Don t Oceans Freeze? Teacher Advanced Version

Freezing Point Depression: Why Don t Oceans Freeze? Teacher Advanced Version Freezing point depression describes the process where the temperature at which a liquid freezes is lowered by adding another

### 18 Q0 a speed of 45.0 m/s away from a moving car. If the car is 8 Q0 moving towards the ambulance with a speed of 15.0 m/s, what Q0 frequency does a

First Major T-042 1 A transverse sinusoidal wave is traveling on a string with a 17 speed of 300 m/s. If the wave has a frequency of 100 Hz, what 9 is the phase difference between two particles on the

### Work, Power, Energy Multiple Choice. PSI Physics. Multiple Choice Questions

Work, Power, Energy Multiple Choice PSI Physics Name Multiple Choice Questions 1. A block of mass m is pulled over a distance d by an applied force F which is directed in parallel to the displacement.

### Recovery of Elemental Copper from Copper (II) Nitrate

Recovery of Elemental Copper from Copper (II) Nitrate Objectives: Challenge: Students should be able to - recognize evidence(s) of a chemical change - convert word equations into formula equations - perform

### ES 106 Laboratory # 2 HEAT AND TEMPERATURE

ES 106 Laboratory # 2 HEAT AND TEMPERATURE Introduction Heat transfer is the movement of heat energy from one place to another. Heat energy can be transferred by three different mechanisms: convection,

### Science Department Mark Erlenwein, Assistant Principal

Staten Island Technical High School Vincent A. Maniscalco, Principal The Physical Setting: CHEMISTRY Science Department Mark Erlenwein, Assistant Principal - Unit 1 - Matter and Energy Lessons 9-14 Heat,

### Investigation M3: Separating Mixtures into Component Parts

Investigation M3: Separating Mixtures into Component Parts Goals: Use various methods to separate mixtures, make inferences from temperature/time graphs, and identify substances. 81 Activity M3.3: What

### Chapter 18 Temperature, Heat, and the First Law of Thermodynamics. Problems: 8, 11, 13, 17, 21, 27, 29, 37, 39, 41, 47, 51, 57

Chapter 18 Temperature, Heat, and the First Law of Thermodynamics Problems: 8, 11, 13, 17, 21, 27, 29, 37, 39, 41, 47, 51, 57 Thermodynamics study and application of thermal energy temperature quantity

### Total Heat Versus Sensible Heat Evaporator Selection Methods & Application

Total Heat Versus Sensible Heat Evaporator Selection Methods & Application Scope The purpose of this paper is to provide specifying engineers, purchasers and users of evaporators in industrial refrigeration

### Chemistry Unit 3 Reading Assignment Energy and Kinetic Molecular Theory

Chemistry Unit 3 Reading Assignment Energy and Kinetic Molecular Theory The story behind the difficulty we have with energy is fascinating to those of us who struggle with trying to teach energy in a coherent

### Lecture 30 - Chapter 6 Thermal & Energy Systems (Examples) 1

Potential Energy ME 101: Thermal and Energy Systems Chapter 7 - Examples Gravitational Potential Energy U = mgδh Relative to a reference height Increase in elevation increases U Decrease in elevation decreases

### States of Matter and the Kinetic Molecular Theory - Gr10 [CAPS]

OpenStax-CNX module: m38210 1 States of Matter and the Kinetic Molecular Theory - Gr10 [CAPS] Free High School Science Texts Project This work is produced by OpenStax-CNX and licensed under the Creative

### ES 106 Laboratory # 6 MOISTURE IN THE ATMOSPHERE

ES 106 Laboratory # 6 MOISTURE IN THE ATMOSPHERE 6-1 Introduction By observing, recording, and analyzing weather conditions, meteorologists attempt to define the principles that control the complex interactions

### FREESTUDY HEAT TRANSFER TUTORIAL 3 ADVANCED STUDIES

FREESTUDY HEAT TRANSFER TUTORIAL ADVANCED STUDIES This is the third tutorial in the series on heat transfer and covers some of the advanced theory of convection. The tutorials are designed to bring the

### LASER MELTED STEEL FREE SURFACE FORMATION

METALLURGY AND FOUNDRY ENGINEERING Vol. 33, 2007, No. 1 Aleksander Siwek * LASER MELTED STEEL FREE SURFACE FORMATION 1. INTRODUCTION Many phisical phenomena happen on the surface of worked object in the

### AIR CONDITIONING TECHNOLOGY

AIR CONDITIONING TECHNOLOGY PART 9 Water Cooled Condensers & Cooling Towers IN LAST month s article we looked at how Air Cooled Condensers are used to transfer the total heat of rejection from the air

### Determination of Molar Mass by Boiling Point Elevation of Urea Solution

Determination of Molar Mass by Boiling Point Elevation of Urea Solution CHRISTIAN E. MADU, PhD AND BASSAM ATTILI, PhD COLLIN COLLEGE CHEMISTRY DEPARTMENT Purpose of the Experiment Determine the boiling

### Physical Properties of a Pure Substance, Water

Physical Properties of a Pure Substance, Water The chemical and physical properties of a substance characterize it as a unique substance, and the determination of these properties can often allow one to

### Q1. (a) The graph shows the temperature inside a flat between 5 pm and 9 pm. The central heating was on at 5 pm.

Q. (a) The graph shows the temperature inside a flat between 5 pm and 9 pm. The central heating was on at 5 pm. (i) What time did the central heating switch off? () (ii) Closing the curtains reduces heat

### Study the following diagrams of the States of Matter. Label the names of the Changes of State between the different states.

Describe the strength of attractive forces between particles. Describe the amount of space between particles. Can the particles in this state be compressed? Do the particles in this state have a definite

### Chem 106 Thursday Feb. 3, 2011

Chem 106 Thursday Feb. 3, 2011 Chapter 13: -The Chemistry of Solids -Phase Diagrams - (no Born-Haber cycle) 2/3/2011 1 Approx surface area (Å 2 ) 253 258 Which C 5 H 12 alkane do you think has the highest

### Comparing Air Cooler Ratings Part 1: Not All Rating Methods are Created Equal

Technical Bulletin By Bruce I. Nelson, P.E., President, Colmac Coil Manufacturing, Inc. Comparing Air Cooler Ratings Part 1: Not All Rating Methods are Created Equal SUMMARY Refrigeration air coolers (evaporators)

### So T decreases. 1.- Does the temperature increase or decrease? For 1 mole of the vdw N2 gas:

1.- One mole of Nitrogen (N2) has been compressed at T0=273 K to the volume V0=1liter. The gas goes through the free expansion process (Q = 0, W = 0), in which the pressure drops down to the atmospheric

### Activity 5 At a Glance

At a Glance Testing Your Hypothesis by Boiling Water Below Its Boiling Temperature Purpose To have students boil water below its typical boiling temperature by reducing the pressure above the surface of

### The Fundamentals of Thermoelectrics

The Fundamentals of Thermoelectrics A bachelor s laboratory practical Contents 1 An introduction to thermoelectrics 1 2 The thermocouple 4 3 The Peltier device 5 3.1 n- and p-type Peltier elements..................

### Volcano in the lab: a wax volcano in action: teacher s notes

Volcano in the lab: a wax volcano in action: teacher s notes Level This activity is designed for students aged 11-14, as a simple demonstration of igneous activity. English National Curriculum reference

### BB-18 Black Body High Vacuum System Technical Description

BB-18 Black Body High Vacuum System Technical Description The BB-18 Black Body is versatile and is programmed for use as a fixed cold target at 80 K or variable target, at 80 K- 350 K no extra cost. The

### Answer, Key Homework 6 David McIntyre 1

Answer, Key Homework 6 David McIntyre 1 This print-out should have 0 questions, check that it is complete. Multiple-choice questions may continue on the next column or page: find all choices before making

### Forms of Energy. Freshman Seminar

Forms of Energy Freshman Seminar Energy Energy The ability & capacity to do work Energy can take many different forms Energy can be quantified Law of Conservation of energy In any change from one form

### 7. What is the current in a circuit if 15 coulombs of electric charge move past a given point in 3 seconds? (1) 5 A (3) 18 A (2) 12 A (4) 45 A

1. Compared to the number of free electrons in a conductor, the number of free electrons in an insulator of the same volume is less the same greater 2. Most metals are good electrical conductors because

### Every mathematician knows it is impossible to understand an elementary course in thermodynamics. ~V.I. Arnold

Every mathematician knows it is impossible to understand an elementary course in thermodynamics. ~V.I. Arnold Radiation Radiation: Heat energy transmitted by electromagnetic waves Q t = εσat 4 emissivity

### Thermodynamics AP Physics B. Multiple Choice Questions

Thermodynamics AP Physics B Name Multiple Choice Questions 1. What is the name of the following statement: When two systems are in thermal equilibrium with a third system, then they are in thermal equilibrium

### HEAT TRANSFER ANALYSIS OF COLD STORAGE

HEAT TRANSFER ANALYSIS OF COLD STORAGE Upamanyu Bangale and Samir Deshmukh Department of Mechanical Engineering, SGBA University, Amravati, India ABSTRACT India is largest producer of fruit and vegetable

### Vicot Solar Air Conditioning. V i c o t A i r C o n d i t i o n i n g C o., l t d Tel: 86-531-8235 5576 Fax: 86-531-82357911 Http://www.vicot.com.

Vicot Solar Air Conditioning V i c o t A i r C o n d i t i o n i n g C o., l t d Tel: 86-531-8235 5576 Fax: 86-531-82357911 Http://www.vicot.com.cn Cooling, heating, and domestic hot water. Return on investment

### Mechanical Energy. Mechanical Energy is energy due to position or motion.

Mechanical Energy Mechanical Energy is energy due to position or motion. Position: This means that matter can have energy even though it is not moving. If you knock something off of your kitchen counter,

### Natural Convection. Buoyancy force

Natural Convection In natural convection, the fluid motion occurs by natural means such as buoyancy. Since the fluid velocity associated with natural convection is relatively low, the heat transfer coefficient

### Apparatus error for each piece of equipment = 100 x margin of error quantity measured

1) Error Analysis Apparatus Errors (uncertainty) Every time you make a measurement with a piece of apparatus, there is a small margin of error (i.e. uncertainty) in that measurement due to the apparatus

### Experiment 6 ~ Joule Heating of a Resistor

Experiment 6 ~ Joule Heating of a Resistor Introduction: The power P absorbed in an electrical resistor of resistance R, current I, and voltage V is given by P = I 2 R = V 2 /R = VI. Despite the fact that

### Exam on Heat and Energy

Exam on Heat and Energy True/False Indicate whether the statement is true or false. 1. Energy is the ability to cause change. 2. Energy is measured in joules. 3. When you ride a playground swing, your

### The Distance Learning Centre

The Distance Learning Centre STUDENT ASSESSMENT SHEET SUBJECT: Physics UNIT TITLE: Introduction to Physics: Solving Problems in Basic Physics LEVEL: 3 Formative Assessment (Ungraded) CREDITS: 3 How to