MHT CET · Physics · Rotational Motion

A flywheel at rest is to reach an angular velocity of $24 rad s^{- 1}$ in $8 s$ with constant angular acceleration. The total angle turned through during this interval is

A $24 rad$
B $48 rad$
C $72 rad$
D $96 rad$

Verified Solution

Answer & Solution

Correct Answer

(D) $96 rad$

Step-by-step Solution

Detailed explanation

ω_{0} = 0, ω = 24 rad s^{- 1}, t = 8 s

∴ α = \frac{ω - ω_{0}}{t} = \frac{24}{8} = 3 {rad s}^{- 2}

θ = ω_{0} t + \frac{1}{2} α t^{2}

= 0 + \frac{1}{2} \times 3 \times {(8)}^{2}

= \frac{3 \times 64}{2} = 96 rad .

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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A flywheel at rest is to reach an angular velocity of 24 rad s-1 in 8 s with constant angular acceleration. The total angle turned through during this interval is

Step-by-step Solution

A flywheel at rest is to reach an angular velocity of $24 rad s^{- 1}$ in $8 s$ with constant angular acceleration. The total angle turned through during this interval is