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Q1. A copper vat is 12 m long at room temperature (20 degrees Celsius). How much longer is it as it contains boiling water at 1 atm pressure?

Q2. A string that passes over a pulley has a 0.321 kg mass attached to one end and a 0.636 kg mass attached to the other end. The pulley which is a disk of radius 9.40 cm has friction in its axle. What is the magnitude of frictional torque that should be exerted by the axle if the system is to be in static equilibrium?

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