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A metal coin of mass 5g and radius 1 cm is fixed to a thin stick AB of negligible mass as shown in the figure.  The system is initially at rest.  The constant torque, that will make the system rotate about AB at 25 rotations per second in 5 s, is closed to : 

(a)

4.0 Nm

(b)

7.9 Nm

(c)

2.0 Nm

(d)

1.6 Nm



Question ID - 51357 | SaraNextGen Top Answer

A metal coin of mass 5g and radius 1 cm is fixed to a thin stick AB of negligible mass as shown in the figure.  The system is initially at rest.  The constant torque, that will make the system rotate about AB at 25 rotations per second in 5 s, is closed to : 

(a)

4.0 Nm

(b)

7.9 Nm

(c)

2.0 Nm

(d)

1.6 Nm

1 Answer
127 votes
Answer Key / Explanation : (c) -

+t

⇒ 25=5

=10

⇒  =

=

=2.0Nm

127 votes


127