Exam2-2010 solutions

# Exam2-2010 solutions - PHYSICS 111 EXAM 2 FALL 2010 In all...

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PHYSICS 111 EXAM 2 FALL 2010 In all problems neglect the effects of air friction. 19. A student starting from rest pulls a 50.0 kg box across a level frictionless surface for a distance of 25.0 m with a force of 30.0 N. W= F~O x How much work is done by the student? .::. "30 Q7~SO{'l-5) (a) 208 J (b) 317 J (c) 528 J 614 ~(e) 750 J ~14- t> 20. A 25.0 kg child starting from rest slides down a slide. The top of the slide is 8.00 m vertically above the ground. His speed at the bottom was 9.0 m/s. How much energy was lost due to friction? ... ' YJF =: w-t"k.- LI2rt--1r7. (a) 0 J (b) 582 J @'959(d) 1.23x103 J (e) 1.96x103 J =2.,(q'11)'t-tc>~Ii)'" I"::l. ...' ;:;: 1~61. .-lot,- A 0.53 kg ball compresses tr::= D -7 u ~ - =~ o~ a vertical spring a distance . c:: - _:_~/- 5.0 cm as shown to the right. ~ ~ 21. How high h will the ball rise if released? The spring constant is 1000. N/m. Ignore all friction. WL}~ = ±Kx"'- (a) 15 cm @) 24 cri!)(c) 35 cm (d) 41 cm (e) 56 cm h-;: /(x-'7. . = ,t060( s/tOQ)7. "l. W'--,. ,-(. >"J)'\t '1t I 22. In the above problem the work done by the spring on the ball k:"~ . is + and the work done by gravity on the ball while it is . . gOing up IS - . @:_. .~ (a) positive, positive (b) positive, zero 9 positive, negat~ (d) negative, positive (e) negative, negative

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pencil rested upright on a sheet of paper as shown to the right. The lecturer atterrlpted to remove the paper without knocking over the pencil. Which statement below best describes this demonstration. (a) The force
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Exam2-2010 solutions - PHYSICS 111 EXAM 2 FALL 2010 In all...

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