PHY 138 - Chapter 5 Solutions (Part 2)

# PHY 138 - Chapter 5 Solutions (Part 2) - Problem 5.18 The...

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Problem 5.18 The distance the sled travels before coming to rest is !" m 0 . 2 s m 81 . 9 10 . 0 2 s m 0 . 2 2 2 1 2 1 2 2 2 0 2 0 2 0 # \$ % ( ) \$ % ( ) # # # * # * + # g v d mv mgd mv fd K W , . Problem 5.19 The initial mechanical energy is mgh U K E i i i # - # . The final mechanical energy is 2 2 1 mv U K E f f f # - # Then, Conservation of Energy yields m 1 . 4 s m 8 . 9 2 s m 0 . 9 2 2 1 2 2 2 2 2 # \$ % ( ) \$ % ( ) # # # # # g v h v gh mv mgh E E f i

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Problem 5.23 The height of the motorcycle can be found by using conservation of energy. We will assume that the bottom of the ramp has U = 0. Then, the height above the jump of the apogee is !" m 93 . 6 s m 81 . 9 2 s m 0 . 33 s m 0 . 35 2 2 1 2 1 2 1 2 1 2 1 2 2 2 2 2 2 2 2 2 2 2 # \$ % ( ) \$ % ( ) * \$ % ( ) # * # * # - # - # # g v v v v gh gh v v mgh mv mv E E f i f i f i f i f i . Problem 5.26 The altitude of the pole vaulter when she crosses the bar is !" m 05 . 5 s m 81 . 9 2 s m 0 . 1 s m 10 2 2 1 2 1 2 1 2
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PHY 138 - Chapter 5 Solutions (Part 2) - Problem 5.18 The...

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