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A wheel of radius R and mass M is placed...

A wheel of radius R and mass M is placed at the bottom of a fixed step of height R as shown in the figure. A constant force is continuously applied on the surface of the wheel so that it just clims the step without slipping. Consider the torque `tau` about an axis normal to the plane of the paper passing through the point Q. Which of the following options is/are correct?

A

U the force is applied normal to the oircum ference at point P, then r is zero

B

If the force is applied tangentially at point Sgtj then x ?ÿ 0 but tl »e w heel never climbs the step

C

If the force is applied at point P tangentially, then t decreases continuously as the wheel climbs

D

If the force is applied normal to the circunv ference al point X, then r is constant

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