Review. Prep for Exam 2 Wednesday, 10/23 at 7:15pm. 10/23/2013 Physics 218
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1 Chapters 5, 6, 7, 8 Review Prep for Exam 2 Wednesday, 10/23 at 7:15pm Blocker /23/2013 Physics 218 1
2 Learning Goals Chapter 5 How to use Newton s Laws to solve problems involving forces that act on a body in equilibrium. How to use Newton s 2 nd Law to solve problems involving the forces that act on an accelerating body. The nature of the different types of frictional forces: Static, Kinetic, Rolling, and Fluid Resistance, and how to solve problems that involve these forces. How to solve problems involving forces that act on a body moving along a circular path. 10/23/2013 Physics 218 2
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6 5.99) Block A, with a weight 3w slides down an incline of 36.9 degrees at a constant speed. Plank B, weight w, rests on top of block A. A) draw a free body diagram of block A. B) If coefficient of kinetic friction is the same between a-b and a-ramp, solve for its value. 10/23/2013 Physics 218 6
7 5.119) A small bead can slide without friction on a circular hoop of radius m. The hoop rotates at a constant rate of 4.00 rev/sec about the vertical. Find the angle beta that the bead will make when in equilibrium. 10/23/2013 Physics 218 7
8 Learning Goals Chapter 6 What it means for a force to do work and how to calculate the amount of work done. The definition of kinetic energy of a body and what it means physically. How the total work done on a body changes the body s kinetic energy and how to use this principle to solve problems in mechanics. How to use the relationship between the total work and the change in kinetic energy when the forces are not constant, the body follows a curved path or both. How to solve problems involving power. 10/23/2013 Physics 218 8
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12 6.75) A small block of mass.090 kg is attached to a cord passing through a hole in a frictionless horizontal surface as shown. The block is originally i revolving at a distance of 0.40m with a speed of 0.70 m/s. The cord is then pulled from below, changing g the radius of the circle to 0.10 m. At this new distance the speed of the block is observed to be 2.80 m/s. A) What was the tension in the cord in the original configuration? B) find the work done by the person pulling on the cord. 10/23/2013 Physics
13 6.77) A block of ice of mass 4.00 kg is initially at rest on a frictionle ss surface. r A worker then applies a force F to it resulting in motion along the x - axis with x(t) given by the following : x ( t ) = α t + β t, where α = m/s and β = m/s 3 a) Find the velocity of the block of ice the work done by the force F duringthe at t = 4.00 s. b) Calculate first 4.00 s of motion. 10/23/2013 Physics
14 Learning Goals- chapter 7 How to use the concept of gravitational potential energy in problems that involve vertical motion. How to use the concept of elastic potential energy in problems involving a moving body attached to a stretched or compressed spring. The distinction between conservative and non-conservative forces and how to solve problems involving both kinds of forces. How to calculate the properties of a conservative force if you know the corresponding potential energy function. How to use energy diagrams to understand the motion of an object moving in a straight line under the influence of a conservative force. 10/23/2013 Physics
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18 7.42) A 2.00 kg block is pushed against a spring with a force constant of k=400 N/m and negligible mass, compressing it 0.220m. A) What is the speed of the block on the horizontal. B) How high up the ramp will the block slide before coming to rest? 10/23/2013 Physics
19 7.46) A car in an amusement park rolls without friction along the track as shown. If it starts from rest at point A at height h above the horizontal, what is the minimum height that it must be released with to make it through the loop without falling off at B? 10/23/2013 Physics
20 Learning Goals-chapter 8 The meaning of the momentum of a particle(system) and how the impulse of the net force acting on a particle causes the momentum to change. The conditions under which the total momentum of the system of particles is constant (conserved). How to solve two-body collision problems. The distinction between elastic, inelastic and completely inelastic collisions. The definition of the center of mass of a system and what determines how the center of mass moves. 10/23/2013 Physics
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24 8.50) You are at the controls of a particle accelerator sending a beam of protons 1.50 X 10 7 m/s at a gas target of an unknown element. Your detector tells you that some protons bounce straight back with a speed of 1.2 X 10 7 m/s. Assume that the collision is elastic, find the mass of the unknown element. 10/23/2013 Physics
25 8.78) A small wooden block of mass 0.80 kg is suspended from a light cord that is 1.60 m long. The block is initially at rest. A bullet of mass 12.0 g is fired at the block with a horizontal velocity of v o. The bullet strikes the block and becomes embedded in it. When the block has risen a vertical height of 0.80 m, the tension in the cord it 4.80 N. What is the initial velocity of the bullet? 10/23/2013 Physics
26 A 45.0 kg woman stands up in a 60.0 kg canoe 5.0 m long. She walks from a point 1.00 m from one end to a point 1.00 m from the other end. If you ignore there resistance of motion of the canoe in water, how far does the canoe move in this process? 10/23/2013 Physics
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