### Compute the time t for the pencil to hit the ground

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Q. The bolts on a car wheel require tightening to the torque of 90 N•m. If a 30 cm long wrench is used, what is the magnitude of the force necessary when the force applied at 53° to the wrench?

Q. Compute the time t for the pencil to hit the ground, assuming that it falls from standing perfectly vertical and maintains the angular acceleration.

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