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EPChap09-Solution2

EPChap09-Solution2 - Chap.9 HW2 Questions 5 Figure 9-28...

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6 Chap.9 HW2 Questions 5. Figure 9-28 shows graphs of force magnitude versus time for a body involved in a collision. Rank the graphs according to the magnitude of the impulse on the body, greatest first. = = tf ti x ix fx dt F p p Impulse This is the area under the F versus t curve. In all three cases it is equal to 12 F o t o so they all tie Problems 35. A 91 kg man lying on a surface of negligible friction shoves a 68 g stone away from himself, giving it a speed of 4.0 m/s. What speed does the man acquire as a result? There are no external forces in the horizontal direction therefore f i P P ) v = Since the man is initially stationary 0 = i P v Let + x be the direction the stone is thrown, then writing out f P explicitly ( m s is the stone, m m is the man) s m v m m v v m v m s m s m m m s s / 10 3 4 91 068 . 0 0 3 × = = = + = The negative sign indicates that the man moves in the -x direction, opposite to the direction of motion of the stone.

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