Exam I. Spring 2004 Serway & Jewett, Chapters 15. Fill in the bubble for the correct answer on the answer sheet. next to the number.


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1 Agin/Meye PART I: QUALITATIVE Exam I Sping 2004 Seway & Jewett, Chaptes 15 Assigned Seat Numbe Fill in the bubble fo the coect answe on the answe sheet. next to the numbe. NO PARTIAL CREDIT: SUBMIT ONE ANSWER ONLY Note that in qualitative multiple choice questions, sometimes one answe is clealy coect, while the othes ae clealy incoect. Howeve, with some questions you must choose the best o most complete answe. Note also that even though this section is qualitative, the fomula sheet may be useful fo some questions. 20 poblems, 3 pts each =60 pts =50% of exam 1) An example of vecto quantity would be: a) speed b) density c) tempeatue d) velocity e) distance taveled 2) (135.5 x 1.43) computed to the coect # of significant digits is: a) b) 211 c) 2.1 x 10 2 d) e) ) Which of the following descibes an object moving with constant velocity? a) A ca sliding to a halt at a snowcoveed intesection b) A toy tain taveling in a cicle at constant speed c) A ball thown out the window of a tall building d) A peson walking on a staight sidewalk at constant speed e) A box sliding down a fictionless hill 4) An object with constant acceleation will, ove time, always: a) speed up b) slow down c) change diection d) change speed e) change velocity
2 5) An object has a velocity of m/s at t=0. If acceleation is constant and negative, a velocity the object could have at some late time is: a) zeo m/s b) m/s c) m/s d) 10.0 m/s e) 3.00 m/s 6) The displacement of an object at time t=7 seconds is 15.0 m. One possible distance taveled causing this displacement is: a) m b) 0.00 m c) 7.00 m d) 14.0 m e) 17.0 m 7) In the velocity vs. time gaph shown below, which statement is false? v(t) m/s 0 T seconds a) The object stats fom est b) The object stops at one point c) The object expeiences constant acceleation d) The object changes diection e) The object has a changing speed 8) The fundamental unit equivalent fo Newtons (the unit of foce) is: a) kg m/s b) s 2 /kg m c) kg m/s 2 d) kg m 2 /s 2 e) m kg 2 /s 9) When two vectos A and B, which have diffeent diections and magnitudes, ae added, thei esultant will have a magnitude: a) A+B b) 2 2 A + B c) ½(A+ B) d) zeo e) This cannot be detemined without moe infomation. 10) A child sleds down a hill. On a second tip down, his fathe, with mass 4 times that of the child, goes WITH the child in the same sled. The atio of the sled/hill coefficient of kinetic fiction on the fist (child only) ide to that on the second (child and fathe) ide is: a) 5:1 b) 1:4 c) 1:25 d) 1:5 e) 1:1
3 11) Planes get lift (the foce that keeps them in the ai) by maintaining a minimum ai speed (the speed of ai moving past the wings of the plane.) To maximize lift, on a windy day, a pilot should: a) take off into the wind and land with the wind b) take off with the wind and land into the wind c) both take off and land with the wind d) both take off and land into the wind e) take off pependicula to the pevailing wind 12) A ca bakes while taveling aound a 90 degee cone. In this situation: a) a t 0 and a 0 b) a t = 0 and a 0 c) a t 0 and a =0 d) a t = 0 and a =0 e) a 0, but impossible to tell about a t 13) Conside you exam pape esting on you desk. The Newton s thid law eaction foce due to the action of the exam s weight on the desk is: a) the fiction between the pape and desk b) the foce of you pencil pushing down on the pape c) the foce of the desk pushing up on the pape d) nonexistent in this case e) a foce lage than the weight of the exam 14) An oange sitting on a shelf can be defined as being in a state of equilibium. This means: a) no foces ae acting on the oange b) all foces acting on the oange cancel each othe out c) only the foce of gavity is acting on the oange d) the oange is in a state of feefall e) even if someone pushed on the oange, it would not move 15) A ca on an icy oad takes a cone too fast and slides off the oad. The appopiate physics explanation fo this would be that the ice esulted in: a) too little centipetal foce b) too much fictional foce c) too much centipetal foce d) too little nomal foce e) too much nomal foce 16) A pojectile is launched ove a level suface on the eath. Which of these statements about the pojectile is false? a) vetical acceleation is always m/s 2 b) hoizontal velocity is constant c) speed is a maximum when the pojectile s at gound level d) velocity is zeo at the peak of its flight e) the flight path is the shape of a paabola 17) An object hee on eath has a mass of 41 kg. On the moon, whee the gavitational acceleation is 1/6 th that of eath, the object would: a) have a lowe mass b) have a highe mass c) have a lowe weight d) have a highe weight e) have the same mass and weight
4 18) The velocity of an object is descibed by the equation: v ( t ) = 5î + 6tĵ + 7tkˆ m/s. This object is acceleating in which diections? a) y only b) y and z c) x, y, and z d) z only e) the object is not acceleating 19) A peson is standing on a scale in an elevato. The scale eads 180 lb with the elevato at est. The peson pesses the up button, then watches the scale while the elevato acceleates upwad to a constant velocity, tavels a bit, and then slows to a stop at a highe floo whee the scale again eads 180 lb. Duing the tip, the scale s eading would: a) decease, etun to 180 lb, incease b) incease, etun to 180 lb, decease c) incease and stay at a highe value d) decease and stay at a lowe value e) stay at 180 lb fo the whole tip 20) A teache pushes an ease pependiculaly against a chalkboad whee it stays. The foce that keeps the ease fom falling to the floo is povided by: a) the teache s hand b) the nomal foce c) static fiction d) kinetic fiction e) centipetal foce
5 Pat II: QUANTITATIVE Mak the bubble fo the coect answe on the answe sheet. Use the backs of these test pages fo scatch wok. PARTIAL CREDIT POSSIBLE: Select one (1), two (2), o thee (3) answes 6 points if you mak the single coect answe 4 points if the coect answe is among you two choices 2 points if the coect answe is among you thee choices 10 poblems, 6 pts each =60 pts = 50% of exam 21) A ca stats fom est and acceleates at a constant ate of 5.41 m/s 2 fo 4.00 seconds. The ca's aveage velocity duing this time inteval is: a) 21.6 m/s b) 10.8 m/s c) 5.41 m/s d) 7.20 m/s e) 0 m/s 22) A ball undegoing constant acceleation olls down a hill. At point A, its velocity is 2.65 m/s. At point B, its velocity is 4.21 m/s. If the two measuements ae taken 3.10 seconds apat, find the constant ate of acceleation. a) 6.86 m/s 2 b) 1.36 m/s 2 c) 3.43 m/s 2 d) 2.21 m/s 2 e) m/s 2 23) A penny is dopped fom an obsevation deck 421 m above a sidewalk. Neglecting ai esistance, find the speed of the penny as it hits the sidewalk? a) depends on the mass of the penny b) 42.9 m/s c) 64.2 m/s d) 90.8 m/s e) 1030 m/s Fo poblems 2425, the displacement of an object is descibed by the equation: t 5iˆ 2 ( ) = + 6t ˆj + 7 tkˆ m. 24) The displacement of this object at t=2.00 seconds is: a) ( 2 ) = 5 iˆ + 24 ˆj + 14 kˆ m b) ( 2 ) = 24 ˆj + 14 kˆ m c) ( 2 ) = 5iˆ + 12 ˆj + 14 kˆ m d) 43 m e) 18 m 25) At t=3.00 seconds, the ycomponent of this object s velocity is: a) 12 m/s b) 24 m/s c) 33 m/s d) 36 m/s e) 90 m/s
6 26) Conside the vecto R = 7.51 iˆ ˆj m. Coectly expessed in pola coodinates, this vecto is: a) 13.4 m at 55.9 above the +x axis b) m at 55.9 above the +x axis c) 18.6 m at 55.9 above the +x axis d) 13.4 m at 34.1 above the +x axis e) 13.4 m at 34.1 below the +x axis 27) A ball with mass kg is tied to a sting and then swung in a hoizontal cicle with adius 1.45 m at a speed of 9.60 m/s. The tension foce in the sting is: a) 3.64 N b) 5.01 N c) 19.2 N d) 35.0 N e) 36.7 N 28) A block with mass 2.50 kg slides at a constant velocity down a wooden amp aised to an angle of 14.5 above the hoizontal. What is the coefficient of kinetic fiction between the block and amp? a).251 b).259 c).310 d).502 e) ) A loaded sled with combined mass=271 kg ests on a level suface with µ k = Two people pull on opes attached to the sled as shown fom above. If F1 = F2 = 550 N, find the net acceleation of the sled. a) 1.15 m/s 2 b) 1.81 m/s 2 c) 1.88 m/s 2 d) 3.60 m/s 2 e) 4.07 m/s 2 F F2 30) A baseball fan is in the stands just behind an outfield wall. She thows a ball onto the field. When the ball leaves he hand it has a puely hoizontal velocity of 17.9 m/s and is 3.30 m above the level playing field. How fa fom the outfield wall the field does the ball hit the gound? a) 5.42 m b) 10.4 m c) 14.7 m d) 18.4 m e) 29.6 m
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