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Q. A hot ( ) lump of metal has a mass of 250 g and a specific heat of 0.25 . John drops the metal into a 500-g calorimeter containing 75 g of water at . The calorimeter is constructed of a material that has a specific heat of 0.10 . When equilibrium is reached, what will be the final temperature?

Q. A small sphere with massof 1.50 g hangs by a thread between two parallel vertical plates 5.0 cm apart. The charge on the sphere is q = 8.90 x .000001 C. What potential difference between the plates will cause the thread to assume an angle of 30.0 degrees with the vertical?

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