ROTATIONAL MOTION MCQ Quiz: GKFix - Bridge of Knowledge - Page 279

Question 1391

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What is the significance of the cross product in the torque expression τ = rᵢ × mᵢg?

It calculates linear momentum
It gives the scalar mass
It measures speed
It accounts for the direction and perpendicular distance in torque

Question 1392

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What type of equilibrium is achieved when a body is balanced at its centre of gravity?

Dynamic equilibrium
Thermal equilibrium
Chemical equilibrium
Mechanical equilibrium

Question 1393

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Under what condition does the centre of gravity coincide with the centre of mass?

Only in symmetric bodies
In zero gravity
In non-uniform gravitational field
In uniform gravitational field

Question 1394

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What does the equation Σ mᵢrᵢ = 0 imply about the origin when rᵢ is measured from it?

The origin is the geometric center
The origin is the point of suspension
The origin is the centre of mass
The origin is arbitrary

Question 1395

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Why can g be taken out of the summation in the torque equation Σ rᵢ × mᵢg?

Because g is zero
Because g varies with height
Because g is scalar
Because g is constant for all particles in uniform gravity