Question

Section of hollow pipe and a solid cylinder have the same radius, mass, and length. They
both rotate about their long central axes with the same angular speed. Which object has the
higher moment of inertia? (a) the hollow pipe (b) the solid cylinder (c) they have the same
rotational kinetic energy (d) impossible to determine​

Answer 1

Answer:

• Option B (The hollow pipe has the higher angular momentum)

Explanation:

Angular momentum = $I*w$

I = Moment of inertia

w = Angular velocity

Hollow pipe can be considered as hollow cylinder

Moment of Inertia of Hollow cylinder = $Mr^2$

Moment of Inertia of solid cylinder= $\frac{Mr^2}{2}$

Clearly Moment of inertia of hollow pipe is greater which states that Angular momentum of it will be greater.

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