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Question :
21. The end of the cutting cord a gas-powered weed : 2102153

21. The end of the cutting cord on a gas-powered weed cutter is 0.15 m in length. If the motor rotates at the rate of 20 rev/s, what is the tangential speed of the end of the cord?

A. 628 m/s

B. 25 m/s

C. 19 m/s

D. 63 m/s

22. A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of 0.050 m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.15 m/s?

A. 3.0 rev/s

B. 1.5 rev/s

C. 0.48 rev/s

D. 0.24 rev/s

23. Consider a point on a bicycle wheel as the wheel makes exactly four complete revolutions about a fixed axis. Compare the linear and angular displacement of the point.

A. Both are zero.

B. Only the angular displacement is zero.

C. Only the linear displacement is zero.

D. Neither is zero.

24. Consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the linear and angular velocities of the point.

A. Both are constant.

B. Only the angular velocity is constant.

C. Only the linear velocity is constant.

D. Neither is constant.

25. Consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the linear and angular accelerations of the point.

A. Both are zero.

B. Only the angular acceleration is zero.

C. Only the linear acceleration is zero.

D. Neither is zero.