Question

A fly wheel rotates about a fixed axis and slows down from 300 r.p.m. to 100 r.p.m. in 2 minutes. Then its angular retardation in radian/minute² is –

• A. $\frac{100}{\pi}$
• B. 100
• C. 100 p
• D. 200 p

Answer 1

Answer: (D)

200 p

Answer 2

a = $\frac{\omega_{2}–\omega_{1}}{t}$ = $\frac{2\pi(100–300)}{2}$ = – 200 p rad/m²