Question 1 What is the condition(s) for static equilibrium of an extended object

Question

Question 1

What is the condition(s) for static equilibrium of an extended object

Question 1 options:

A) Only the sum of all torques should be zero.

B) Only the sum of all forces in components should be zero.

C) Only when there is neither a force nor a torque present.

D) The sum of forces and the torques should be equal to zero.

E) The sum of all forces should be equal to zero and the sum of all torques should be equal to zero.

Question 2

Which has more effect when trying to loosen a screw using a wrench; doubling the wrench arm or doubling the force?

Question 2 options:

A) doubling the force.

B) doubling the arm.

C) neither one has any effect.

D) they have the same effect.

E) depends on the value of the force and the length of the arm.

Question 3  A-rod in a toy is rotating with 8 rad/s around an axis through its center and perpendicular to its length. At a later time, without applying any force or torque, the rod starts to rotate around an axis through one of its ends, also perpendicular to its length. The new angular velocity is:

Question 3 options:

A) 8 rad/s.

B) 32 rad/s.

C) 2 rad/s.

D) 16 rad/s.

E) 4 rad/s.

Question 4 To increase the capacity of compact discs, suppose the new such discs made of the same material and thickness, but with twice the diameter. By what factor the moment of inertia will change? Give your answer as a whole number.

Your Answer: Question 4 options:

Answer units

Explanation / Answer

ANSWER 1

option E is correct

sum of all forces and torque should be equal to zero.

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