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Question :
1. 2 600 rev/min equivalent to which of the following?
A. : 2102140

1. 2 600 rev/min is equivalent to which of the following?

A. 2600 rad/s

B. 43.3 rad/s

C. 273 rad/s

D. 60 rad/s

2. A grindstone spinning at the rate of 8.3 rev/s has what approximate angular speed?

A. 3.2 rad/s

B. 26 rad/s

C. 52 rad/s

D. 81 rad/s

3. A 0.12-m-radius grinding wheel takes 5.5 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration?

A. 9.6 rad/s^{2}

B. 4.8 rad/s^{2}

C. 1.6 rad/s^{2}

D. 0.33 rad/s^{2}

4. What is the angular speed about the rotational axis of the Earth for a person standing on the surface?

A. 7.3 ´ 10^{-5 }rad/s

B. 3.6 ´ 10^{-5} rad/s

C. 6.28 ´ 10^{-5 }rad/s

D. 3.14 ´ 10^{-5 }rad/s

5. A spool of thread has an average radius of 1.00 cm. If the spool contains 62.8 m of thread, how many turns of thread are on the spool? "Average radius" allows us to not need to treat the layering of threads on lower layers.

A. 100

B. 1 000

C. 3 140

D. 62 800