Question

When seen from below, the blades of

a ceiling fan are seen to be revolving

anticlockwise and their speed is

decreasing. Select correct statement

about the directions of its angular

velocity and angular acceleration.

(A) Angular velocity upwards, angular

acceleration downwards.

(B) Angular velocity downwards,

angular acceleration upwards.

(C) Both, angular velocity and angular

acceleration, upwards.

(D) Both, angular velocity and

angular acceleration, downwards​

Answer 1

Both, angular velocity and angular  acceleration, upwards.

Option (C) is correct.

Explanation:

• If the speed of the ceiling fan is decreasing then the direction of angular velocity will be in upward direction.
• But in counterclockwise direction, if the speed of the angular velocity increasing than the angular acceleration will be pointing in the downward direction.
• Therefore we can say that in anti-clockwise direction the angular velocity will be in upward direction.

Answer 2

Answer:

angular velocity downwards,angular acceleration upward this is a correct ans