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Question :
11. Starting from rest, a wheel undergoes constant angular acceleration : 2102151

11. Starting from rest, a wheel undergoes constant angular acceleration for a period of time *T*. At what time after the start of rotation does the wheel reach an angular speed equal to its average angular speed for this interval?

A. 0.25 *T*

B. 0.50 *T*

C. 0.67 *T*

D. 0.71 *T*

12. Starting from rest, a wheel undergoes constant angular acceleration for a period of time *T*. At which of the following times does the average angular acceleration equal the instantaneous angular acceleration?

A. 0.50 T

B. 0.67 T

C. 0.71 T

D. all of the above

13. A Ferris wheel starts at rest and builds up to a final angular speed of 0.70 rad/s while rotating through an angular displacement of 4.9 rad. What is its average angular acceleration?

A. 0.10 rad/s^{2}

B. 0.05 rad/s^{2}

C. 1.8 rad/s^{2}

D. 0.60 rad/s^{2}

14. A Ferris wheel, rotating initially at an angular speed of 0.50 rad/s, accelerates over a 7.0-s interval at a rate of 0.040 rad/s^{2}. What is its angular speed after this 7-s interval?

A. 0.20 rad/s

B. 0.30 rad/s

C. 0.46 rad/s

D. 0.78 rad/s

15. A Ferris wheel, rotating initially at an angular speed of 0.500 rad/s, accelerates over a 7.00-s interval at a rate of 0.040 0 rad/s^{2}. What angular displacement does the Ferris wheel undergo in this 7-s interval?

A. 4.48 rad

B. 2.50 rad

C. 3.00 rad

D. 0.500 rad