NEET 2022, Physics Q2: Kinematics and Dynamics of Rotational Motion

NEET2022Physics

The angular speed on a fly wheel moving with uniform angular acceleration changes from 1200 rpm to 3120 rpm in 16 seconds. The angular acceleration in rad/s $^{2}$ is :

A
$4 π$
B
$12 π$
C
$104 π$
D
$2 π$

Solution

Using $ω = ω_{0} + α t$ , the angular acceleration is $α = \frac{ω - ω _{0}}{t}$ .

Change in speed: $3120 - 1200 = 1920$ rpm $= \frac{1920 \times 2 π}{60}$ rad/s $= 64 π$ rad/s.

$α = \frac{64 π}{16} = 4 π$ rad/s $^{2}$ .

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NEET 2022, Physics Q2: Kinematics and Dynamics of Rotational Motion

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