10. A 2.50-kg rock is attached at the end of a thin, very light rope 1.45 m long. You start it swinging by releasing it when the rope makes an 11° angle with the vertical. You record the observation that it rises only to an angle of 4.5° with the vertical after swings. (a) How much energy has this system lost during that time? (b) What happened to the “lost” energy? Explain how it could have been “lost.”

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Q: 6. Find the angular momentum of a thin 6.9-kg rod of length 7.5 m if it rotates about its midpoint…

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Q: The moment when A and B is contact, both of A,B are spinning 250rpm counter-clockwise. After…

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Q: 0.1 rad/s O 0.8 rad/s O 0.2 rad/s O 0.4 rad/s

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.