# Assign6 - PHY 2130 Homework solutions Assignment 6 6.5(a If...

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PHY 2130 Homework solutions Assignment 6 6.5 (a) If ball bullet p p = , then ( 29 ( 29 3 3 3.00 10  kg 1.50 10   m s 0.145 kg bullet bullet ball ball m v v m - × × = = = 31.0  m s . (b) The kinetic energy of the bullet is ( 29 ( 29 2 -3 3 2 3 3.00 10  kg 1.50 10   m s 1 3.38 10  J 2 2 bullet bullet bullet KE m v × × = = = × while that of the baseball is ( 29 ( 29 2 2 0.145 kg 31.0  m s 1 69.7 J 2 2 ball ball ball KE m v = = = . The bullet has the larger kinetic energy by a factor of 48.4. 6.16 Choose the positive direction to be from the pitcher toward home plate. (a) ( 29 ( 29 ( 29 ( 29 ( 29 0.15 kg 22  m s 20  m s f i Impulse F t p m v v = ∆ = ∆ = - = - - ( 29 6.3 kg m s,  or    Impulse F t = ∆ = - 6.3 kg m s  toward the pitcher (b) 3 3 6.3 kg m s   3.2 10  N,   2.0 10  s Impulse F t - - = = = - × × or F = 3 3.2 10  N toward the pitcher ×

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6.22 Consider the thrower first, with velocity after the throw of thrower v . Applying conservation
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Assign6 - PHY 2130 Homework solutions Assignment 6 6.5(a If...

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