Question

A 500 n gymnast performing a giant swing with an angular velocity of 5 rad/sec, exerts 90 nm of torque on the support bar. what is the magnitude of torque exerted by the bar on gymnast?

A. none of the above
B. 45 nm
C. 100 nm
D. 90 nm

Answer 1

When a gymnast exerts 90 Nm of torque on the support bar, the bar exerts an equal and opposite torque of 90 Nm back on the gymnast according to Newton's third law. Option D is the correct answer.

Step-by-step explanation:

The question is related to the concept of torque and Newton's third law of motion in Physics. According to Newton's third law, for every action, there is an equal and opposite reaction.

So, when the gymnast exerts a torque of 90 Nm on the support bar, the support bar exerts an equal and opposite torque back on the gymnast. The magnitude of the torque exerted by the bar on the gymnast is therefore 90 Nm.

The correct option, based on this analysis, is D. 90 nm.