Question 7

A bicycle wheel, radius 0.30 m and mass 2 kg (concentrated on the rim), is rotating at 4 rev/s. After 16 seconds the wheel has just stopped because of friction. What was the magnitude of the average torque due to frictional forces?

• A.    0.09 kg m²/s
• B.    0.45 kg m²/s²
• C.    0.09 kg m²/s²
• D.    0.45 kg m²/s
• E.    None of the above

Formula Sheet

Question 6

Question 8

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