Question

A uniform rod with length l is free to rotate about an axis at ground level. The rod makes an angle ϕ with horizontal and is released from rest.

A) The rod will not rotate.

B) The rod will rotate clockwise.

C) The rod will rotate counterclockwise.

D) The direction of rotation depends on the value of ϕ.

Answer 1

When a uniform rod is released from rest and can rotate freely, it will start rotating counterclockwise if it is initially at an angle ϕ with respect to the horizontal.

Step-by-step explanation:

When a uniform rod is released from rest and can rotate freely, it will start rotating counterclockwise if it is initially at an angle ϕ with respect to the horizontal. Therefore, the correct answer is C) The rod will rotate counterclockwise. This is because gravity exerts a torque on the rod, causing it to rotate in the counterclockwise direction.

Answer 2

The uniform rod released from rest at an angle will rotate clockwise due to gravitational torque.

Step-by-step explanation:

The question is related to the rotation of a uniform rod in physics and involves analyzing the motion when the rod is released from rest at an angle. According to the conservation of angular momentum and the principles of rotational dynamics, if the rod is uniform and released from rest at an angle φ with horizontal, the rod will rotate around its axis due to the gravitational torque. Hence, the correct answer is B) The rod will rotate clockwise, assuming that the diagram or scenario implies a typical coordinate system where clockwise rotation is seen from above the axis.