Rotational Motion Question 21
Question: A pulley of radius 2 m is rotated about its axis by a force $ F=(20t-5t^{2}) $ newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg $ m^{2} $ , the number of rotations made by the pulley before its direction of motion if reversed is
[AIEEE 2011]
Options:
A) More than 9
B) Less than 3
C) More than 3 but less than 6
D) More than 6 but less than 9
Show Answer
Answer:
Correct Answer: C
Solution:
- [c] The correct option is C More than 3 but less than 6 Total number of revolution before reversal = $\frac{36}{2π}$
The value which is more than 3 and less than 6
