justunme
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In this problem assume that all of the energy expended goes into working against drag. Assume that F is proportional to v-squared exactly & that the air is motionless with respect to the ground. Suppose a cyclist and the bicycle have a combined mass of 60kg and is moving a 5m/s.
A) If the drag force on the cyclist is 10N, how much energy does the cyclist use in traveling 1 km?
B) If speed is doubled to 10 m/s, how much energy is used in traveling 1 km?
C) Upon slowing down to 5 m/s, we hit a head wind of 5 m/s, How much power is being expended?
2. Homework Equations
W = Fd
P = W/change in time3. The Attempt at a Solution
A) W = 10N x 1km = 10 kj
B) ?
C) ?
A) If the drag force on the cyclist is 10N, how much energy does the cyclist use in traveling 1 km?
B) If speed is doubled to 10 m/s, how much energy is used in traveling 1 km?
C) Upon slowing down to 5 m/s, we hit a head wind of 5 m/s, How much power is being expended?
2. Homework Equations
W = Fd
P = W/change in time3. The Attempt at a Solution
A) W = 10N x 1km = 10 kj
B) ?
C) ?
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