(Solved): 2. What is the work Wrot done by a torque exerted on an object as it turns by an angle ? ...

2. What is the work $W_{\text{rot }}$ done by a torque $?$ exerted on an object as it turns by an angle $?$ ? When using SI units for torque and work, should you use radians or degrees for $?$ ? 3. What is the change in rotational kinetic energy $?K{E}_{\text{rot }}$ caused by a net rotational work $W_{\text{rot? }}$ ? 4. What is the change in angular momentum $?L$ caused by a net torque $?$ applied for a time $?t$ ? 5. If an object initially has rotational velocity ${?}_i$ and moment of inertial $I_i$, and its moment of inertia changes to $I_f$ without any external torque, what is its fina rotational velocity ${?}_f$ ? Explain why.