ROTATIONAL MOTION MCQ Quiz: GKFix - Bridge of Knowledge - Page 93

Question 461

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How does the presence of L_⊥ affect the mechanical stress in a rotating shaft?

It reduces stress
It has no effect
It causes vibrational stresses due to unbalanced angular momentum
It cools the shaft

Question 462

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What is the relationship between the time derivative of L_z and external torque?

They are unrelated
dL_z/dt is half of τ_z
dL_z/dt equals the external torque about the z-axis
dL_z/dt is always zero

Question 463

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Why is the angular momentum vector not necessarily constant even if speed is constant in circular motion?

Because mass changes
Because ω decreases
Because its direction depends on position, which changes continuously
Because friction acts

Question 464

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What is the effect of increasing the radius of a rotating ring on its moment of inertia?

It decreases linearly
It remains unchanged
It increases linearly
It increases quadratically with radius

Question 465

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How does the angular momentum of a planet in elliptical orbit behave?

It increases near perihelion
It decreases near aphelion
It remains constant in magnitude and direction
It reverses direction