Question 551: Centre of Mass and Rotational Motion

Question

A rigid body rotates with an angular momentum L. If its rotational kinetic energy is made four times, its angular momentum will become

Accepted Answer

Angular momentum,
$$\begin{aligned}
\mathrm{L} & =\sqrt{2 \mathrm{KI}} \
\mathrm{K} & =4 \mathrm{~K} \quad 	ext{(given)}\
	herefore \quad \mathrm{L} & =\sqrt{2 	imes 4 \mathrm{KI}}=2 \sqrt{2 \mathrm{KI}}=2 \mathrm{~L}
\end{aligned}$$

Answer

4 L

Answer

16 L

Answer

$$\sqrt2$$ L

Answer

2 L

Centre of Mass and Rotational Motion

A rigid body rotates with an angular momentum L. If its rotational kinetic energy is made four times, its angular momentum will become

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