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    Research on rotational of rigid body.

    My teacher ask us to do a research on physics. I have been choose a topic of torque. I need to find a problem statement before i can start my research. My problem is i have no idea on problem statement. Can somebody help me? ASAP!
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    Block moving down an inclined plane, spring problem.

    You are missing the loss of energy in this part. So, the equation should be U-T1=Wf (where U = potential energy of spring, T1=total initial energy of object, Wf= work done by friction) U is equal to T2 ( T2 = total final energy of object) It is because when the spring is compress by object, so...