(3 pt) A person on a bicycle coasts without pedaling for 4.0 s before beginning to...
- (3 pt) A person on a bicycle coasts without pedaling for 4.0 s
before beginning to pedal again. The person has an initial velocity
of 6.7 m/s to the east when they start coasting. The bicycle feels
a resisting force of 18 N to the west during this coasting motion.
The combined mass of the person and the bicycle is 73 kg.
- What is the impulse of the resisting force?
- What is the change in the combined momentum of the person and the bicycle as they coast?
- What is the person’s velocity when they stop coasting and begin pedaling again?
Homework Answers
a. impulse = F.t = 18x4 = 72 kg.m/s .
b. change in momentum P = - 72 kg.m/s
c. vf = ( mvi - P )/m
vf = ( 73x6.7 - 72 )/73
vf = 5.7 m/s .
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(3 pt) A person on a bicycle coasts without pedaling for 4.0 s
before beginning to...
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