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PHYS-1100 Spring 2010 Exam 2 answer key

PHYS-1100 Spring 2010 Exam 2 answer key - 1 On a trip to...

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Unformatted text preview: 1. On a trip to New Orleans you drive the first 40 miles (64.4 , km) at a speed of 68 mph (30.4 m/s), but traffic congestion slows you down so that for the last 40 miles you can only make 45 mph (20.1 mfs) Your approximate average speed is - " " 25.3 m/s - # C o.‘ Ill/S d) 21.1 m/s e) none of these are even approximately correct ante!“ ISL 6914/0” 2 gm» 1’ M/5 . 2. In the absence of air resistance, a baseballthrown vertically upward from the sidewalk outside of Nicholson Hall just barely reaches the height of the top of the observatory dome on the roof. Falling back down, it strikes the sidewalk 3.26 seconds afier it was thIOWn. Approximately how' far above the sidewalk is the top of the 3 c9 dome? . a) 9.0 In 7 I ll m o 5 m e) none of these are even approximately correct ,3. A . w? 9 . j ‘16 f:¥—;/,é35 ' l f 3. A moving particle is experiencing an acceleration of constant magnitude that is always in a direction perpendicular to its direction of travel. What can you say about the speed (magnitude of velocity) of the article? . ‘_~_ . _ . . p a) it's getting faster / 1’1 25 L5 7%? (WC/("ADM it's getting slower ’- 8"? 0541760? W C i gay/Cm mgr“ PM [71;] a can QM once/MW . not enou_' 1n orrnatron 1s given to be sure P 4. A ball was thrown vertically downward from the roof of a tall building. Later, an identical ball was thrown horizontally, with the same speed, and from the same spot as the first ball. Which of the‘following are true statements? . , ‘ ' a ust before they struck the ground, both balls had the same velocityX fi'gflL am MM 56 £99, fan b) just before they struc e ground, both 3 had the same acceleration c) Just e ore they struck the ground, both” 1515 Had undergo one “the sam ame displacement X d) all of the above (a—c) are true 5mm 9 9’ I 91/6 9 6) none of the above (a—c) are true _ 7 5 4-— 5. You are driving along a city street at a steady (and legal) speed. Sadly, you are so busy texting a classmate about the upcoming physics exam that you fail to notice the school bus in hunt of you turning on its flashers and slowing to a stop. Which of the position versus time graphs below (drawn by the State Trooper who witnessed the event) most appropriately represents the motions of your car (solid line) and the school bus (dashed line)? Take the . _. du direction as the positive x direction. M2? €606 6. in a centrifuge used to train astronauts, the trainee is seated in a gondola at the end of an 11 meter long boom that rotates at a rate of 1 revolution every 3 seconds. How many ‘g’s" will the astronaut trainee experience? Recall thar "g" is the magnitude of the Earth's free-fall gravitational acceleration a) 2.1g b)7.8g ., 277‘}? 06g r “-12.— “ I e) none of the above are even approximately a _ For the next four questions, the position vector of a particle, as a function of time, t, is given by: m) z (2.02:2 —4.0t)i+(l.0t3 —4.0r2)’j meters 7. What IS the approximate magnitude of the average velocity of the fipartiele over the two— second interval from 2. 0 s _< t < 4.0 s ? VEM V , c)15m/SS W4— fité g5 ' d) 18 m/s e1? none of these are even approximately correct :[§(75)2 l/[f/sfla 7“[1(‘/5)3 L/MSJZL —— [26%) we] was) «pf/2%} wig/V z) 1&4 8” m 1. .2 . A: — _§:fi: 3,4 +19" /5 ,5 Em ‘ (81%) {$75) 2:8,?13’é 8. In what approximate direction (expressed as an angle measured Counterciockwise from the +2: axis) Is the particle moving at t= 3.0 s ? ' a)339° t, El/ée 7%? dlr90¥fm _ . b)111° 7L 5 :3 1716* {3:05 1166174))“ 17‘ gaff-=3? c 201° d) 21 ' . none of these are even approximately correct . l'ep. ice ascons antaece erat1onm éy ' , -* 04,14: C) the particle has constant acceleration (1) none of the above (a—c) are TRUE statements . A - e) all of the above ((a—c) are TRUE statements r‘“ x + (é‘f r" 8 a ' ' Cmgfiwl Answer the following four questions pertaining to the velocity versus time graph shown below, which represents the motion of a particle moving along a straight line. . - \ elocity vs Time 10. What is the approximate velocityof the particle at time t = 24 seconds? ' W a) +0.12 m/s . _ _ b) —0.8 m/s 0) —o.29 m/s S 11. What is the approximate acceleration of the particle at time t ,—_l 24 seconds? . m/2 -_ 1:):2131/22 Rae “/L/M/é 7 m , . .. f :L f. "‘5 *7, RUM 520$ ’ A 12. Approximately What is the particle's displacement during the entire 36 seconds graphed? CM 507sz Wale: Wye, gave/1 Eek” #93141 $173? ' (ea/Me '7) : +93 ‘ - e)—11m {£8 éox‘95>(§M/Apy) :\Sré'/’VZ- 13. What is the approximate average velocity of the particle during the 36 second interval? a) 0 m/s b)*0.24m/S m Ollle/QCGMM {é 14/; / r57;— ”4/5 , __._+ilim/s l/fiya : f 3 32?” — e)+l. nil/S '- A basketball thrown onto thereof of a house rolls back down off the roof and lands on the ground below. The pitch of the roof was "5 on 12" meaning the angle of the” roof is 23 degrees from the horizontal, and the ball had a speed of 4.0 m/s when it left the roof, at a point 3.2 m above the ground. 14 Approximately how much time elapsed until the ball struck the groundines [:3 Fotgl/‘fT’LO fl b)0.81s - c 0.735 V- V0 ”fa: ”t e none of the above are even approximately correct 5 if :aéé‘ys 4.919 151$C {—3 2 o “55> W 901,5 fir/ookafléa ca , 15. Approximately how far (horizontally) from the edge of the roofi the ball land? 16. When the ball was 1 6 m above the ground the magnitude of the horizontal component of 1ts velocity was approxmately 7b)“; 9W Q9 WW Hp [Capt 7L}? M06 Orv/51691230 ‘ 353% d) 1 6 m/s e) none of the above are even approximately correct c) the same as at the moment it left the roof ' l / d) not enough information is provided to determine the speed 507 V f 5 MM! ...
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