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An object rotates and increases from 5 to 20 revolutions per second in 15 s. Find...

An object rotates and increases from 5 to 20 revolutions per second in 15 s. Find the initial and final angular velocity of the object, then find the angular acceleration of the object.
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Answer #1

Solution:

From the information given,

i = 5 rev/s = 5*2 = 31.416 rad/s

f = 20 rev/s = 20*2 = 125.7 rad/s

Using angular dynamics,

= f - i/t

= 125.7 - 31.416/15

= 6.3 rad/s2.

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