Question

A constant torque is applied to a rigid wheel whose moment of inertia is 2.0 kg · m2 around the axis of rotation. If the wheel starts from rest and attains an angular velocity of 25.0 rad/s in 13.0 s, what is the applied torque (in N · m)? (Indicate the direction with the sign of your answer.)

Answer 1

The applied torque is 3.84 N-m.

Step-by-step explanation:

Given that,

Moment of inertia of the wheel is
`2\ kg-m^2`

Initial speed of the wheel is 0 (at rest)

Final angular speed is 25 rad/s

Time, t = 13 s

The relation between moment of inertia and torque is given by :

`\tau=I\alpha \\\\\tau=I* (\omega_f)/(t)\\\\\tau=2* (25)/(13)\\\\\tau=+3.84\ N-m`

So, the applied torque is 3.84 N-m.