Question

Consider a torque ⃗τ that is constant in both magnitude and direction, and acts on a rigid body of mass 10 kg at a point 1 m from the pivot.
How much work does the torque do on the rigid body, if it turns through an angle of 180◦ while the torque is acting? Assume the acceleration due to gravity is 10 m/s2.

1. 180 N ·
m 2. 100 N ·
m 3. 180 τ
4. π τ
5. We need the rotational inertia of the body.
6. Zero
7. 50 N · m 8. 200 N · m

Answer 1

the answer is pi t , number 4.