I am stuck completely on this question, it is exam revision and I am having trou

Question

I am stuck completely on this question, it is exam revision and I am having trouble understanding it at all.

My methodology hasbeen to calculate torque due to mass, then mass moment of inertia, then using parallel axis theorem, finding accel due to torque, but am stuck.

I know that there is a level of integration or derivation but am completely stuck on this question.

If you upload images, please show all working and make sure they're legible! I need to know where I'm going wrong on this.

Thanks!

Explanation / Answer

torque=I*alpha I=1/12 ml^2=10*4/12=3.33 kgm^2 angular acc=I/75=0.044 rad/s^2 b). final angular spees=0.044*t=0.177 rad/s c) angle covered by rod in 4 sec=0.5*0.044*16=0.355 rad=20.37 dgrees radial force=5*0.177^2*0.5=0.4425 at angle of 20.37 degrees d) kinetic energy=0.5I 0.177^2=0.0522 joules=work done by torque

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