Not enough information. You need to know the length of the pedal arms to answer

Question

Not enough information. You need to know the length of the pedal arms to answer this question. None of the above. He does not perform any work on the pedals as they are moving in circles. How much metabolic energy does cyclist A use, when she rides a distance of 2.5 km on a level surface at a constant speed of 6.0 m/s? (Assume the air is still.) 1.4 kJ 5.8 kJ 15 kJ 48 kJ 190 kJ Cyclist A and cyclist B ride next to each other on a level surface at a constant speed of 4.0 m/s. They have their chains on the same sprocket size in the front (the chain wheel), but cyclist A uses a relatively small sprocket on the rear cassette, while cyclist B uses a larger sprocket in the rear. Which of the following statements is correct about the rate at which they use metabolic energy? (Assume the air is still) Cyclist A uses metabolic energy at a faster rate due to the larger mass. Cyclist A uses metabolic energy at a faster rate due to the larger rear sprocket. Cyclist B uses metabolic energy at a faster rate due to the smaller rear sprocket.

Explanation / Answer

since Cyclist A cycle rear sprocket is large,it takes more time to complete one revolution, the front sprocket must be rotated more. So Cyclist A will have to pedal more than cyclist B to make one revolution for the rear sprocket and hence use more metabolic energy.

option (B) is correct answer

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