Transcription of UNIT HOMEWORK MOMENTUM ANSWER KEY
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UNIT HOMEWORK MOMENTUM ANSWER KEY
UNIT HOMEWORK MOMENTUM ANSWER KEY MOMENTUM FORMULA & STUFF FROM THE PAST: p = m v, TKE = mv2, d = v t 1. An ostrich with a mass of 146 kg is running to the right with a velocity of 17 m/s. a. Calculate the MOMENTUM (in kg m/s) of the ostrich . Ans. p = m v = 146 kg 17 m/s = 2482 kg m/s b. Calculate the kinetic energy (in J) of the ostrich . Ans. TKE = mv2 = (146 kg)(17 m/s)2 = 21,097 J c. Calculate the distance (in m) travelled by the ostrich after 5 seconds. Ans. d = v t = 17 m/s 5 s = 85 m 2. A 21 kg child is riding a kg bike with a velocity of m/s to the left. a. Calculate the MOMENTUM (in kg m/s) of the child-bike system. Ans. p = m v = (21 kg + kg) m/s = ( kg) m/s = kg m/s b.
The ostrich from Probl. 1 collides with the child and his bike from Probl. 2. Assume the collision is elastic. Make the right the positive direction. a) What is the total momentum of the ostrich/child/bike system together (in kg m/s)? Ans. p total = p ostrich + p
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