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A 54.2 g block of copper whose temperature is 400 K is placed in an insulating box with a 120 g block of lead whose temperature is 200 K.
(a) What is the equilibrium temperature of the two-block system?
(b) What is the change in the internal energy of the system between the initial state and the equilibrium state?
(c) What is the change in the entropy of the system?
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a 1200 kg car going 25m/s is brought to stop using its brakes. what is the change in temperature of the brakes and wheels
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The Hall voltage across a conductor in a 42mT magnetic field is 1.9mu V. When used with the equal current in a different magnetic field, the voltage across the conductor is 2.7mu V.
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The intensity (in W/m2) of one sound is 7.12 times as great as the intensity of another sound. Relative to the quieter sound
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