Calorimetry: A 0.600-kg piece of metal X is heated to 100°C and placed in an aluminum can of mass 0.200-kg which contains 0.500 kg of water initially at 17.3°C. The final equilibrium temperature of the mixture is 20.2°C, what is the specific heat of metal X? The specific heats of water and aluminum are 4186 J/kg ? K (water) and 910 J/kg ? K (aluminum).
A. 140 J/kg ? K
B. 270 J/kg ? K
C. 450 J/kg ? K
D. 900 J/kg ? K
Answer: A
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A 2-kg ball is thrown horizontally at. a speed of 10 m/s. At the same time, a 1-kg ball is dropped from the same height. Ignoring air resistance, which ball hits the ground first?
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Air at 30°C and 200 kPa is flowing in a 30-cm-diameter pipe and passes through the bend shown. An estimate of the pressure difference between the inside of the bend and the outside of the bend is approximately:
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(B) 140 Pa
(C) 180 Pa
(D) 240 Pa