A wheel is rotating at 900 r.p.m. about its axis. When power is cut off it comes to rest in 1 minute. The angular retardation in rad / s 2 is

Question

A wheel is rotating at 900 r.p.m. about its axis. When power is cut off it comes to rest in 1 minute. The angular retardation in rad / s 2 is (A) (π/2) (B) (π/4) (C) (π/6) (D) (π/8)

Tardigrade Admin · Accepted Answer

Angular retardation, α=(ω2-ω1/t) =(2 π(n2-n1)/t) =(2 π(0-(900/60))/60) =(π/2) rad / s 2

Q. A wheel is rotating at $900 r . p . m$ . about its axis. When power is cut off it comes to rest in 1 minute. The angular retardation in $r a d / s^{2}$ is

$\frac{π}{2}$

$\frac{π}{4}$

$\frac{π}{6}$

$\frac{π}{8}$

Angular retardation, $α = \frac{ω _{2} - ω _{1}}{t}$
$= \frac{2 π ( n _{2} - n _{1} )}{t}$
$= \frac{2 π ( 0 - \frac{900}{60} )}{60}$
$= \frac{π}{2} r a d / s^{2}$

Q. A wheel is rotating at 900r.p.m. about its axis. When power is cut off it comes to rest in 1 minute. The angular retardation in rad/s2 is

2π​

4π​

6π​

8π​