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Answer 25-28
025 10.0 points A steel ball bearing is 4 cm in diameter at 20°C. A bronze plate has a hole that is 3.996 cm in diameter at 20°C. What common temperature must they have in order for the ball to just squeeze through the hole? Answer in units of C. 026 10.0 points A square hole 5.9 cm along each side is cut in a sheet of copper. Find the change in the area of this hole if the temperature of the sheet is increased by 45 K. The coefficient of expasion is 1.7 × 10-5 (°C)-1. Answer in units of cm2 027 10.0 points A container of volume 0.6 m3 contains 5.3 mol of argon gas at 24°C. Assuming argon behaves as an ideal gas, find the total internal energy of this gas. The value of the gas constant is 8.31451 J/mol K. Answer in units of J. 028 10.0 points A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 325 g of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? The heat of fusion of ice is 3.33 x 10% J/kg. Answer in units of W.
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