Question

Q.3. A flywhed rotates with a constant retardation due to braking. From 0 to t = 10
seconds, it made 300 revolutions. At time te 7.5 seconds, its angular velocity was 40 x rad/
sec. Determine (a) value of constant retardation, (b) total time taken to come to rest, and (c)
total resolutions made till it comes to rest.
​

Answer 1

Answer:

ω

f

=ω

i

+at

ω

f

= final angular velocity

ω

i

= initial angular velocity

ω= angular acceleration, t=time

Insorting values we get

100=300+9×2

⇒a=−100

min

2

relation

[-denotes reterdation]

As each rotation consists of 2π radian

So a=−100×2x

(min)

2

radian

=−200π

(min)

2

radian