Unformatted text preview: with the cart without If the top block is just about to slide, then
Newton’s second law for block 1, Also, by
Therefore, Newton’s law for the two blocks together gives Therefore, 7 Problem 7. [28pt] Select the appropriate answer for each multiplechoice question. An
explanation is not required if your answer is correct, but is required for partial credit in the
event of an incorrect answer.
(a) [4pt] A 0.280kg ball makes an elastic headon collision with a second ball initially at rest.
The second ball moves off with one fourth the original speed of the first ball. The mass of the
second ball is
[A] 0.280 kg [B] 0.560 kg [C] 0.840 kg [D] 1.12 kg If primes denote the final velocities, we are given that
the relative speeds are maintained, so [E] 1.96 kg For an elastic collision, Therefore, Momentum conservation implies that Therefore, which implies that Then kg, so the answer is E. (b) [4pt] A cubic block of cherry wood with sides of 10.0 cm has a density of 800 kg/m3. The
cubic block flo...
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This document was uploaded on 03/09/2014 for the course PHYS 221 at Ohio Northern University.
 Fall '12
 ScottYost
 Physics

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