# HW 11 - lie(el7352 HW11 markert(56480 This print-out should...

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lie (el7352) – HW11 – markert – (56480) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A copper telephone wire has essentially no sag between poles 22 m apart on a winter day when the temperature is - 18 C. How much longer is the wire on a summer day when the temperature is 32 C? As- sume that the thermal coefficient of copper is constant throughout this range at its room temperature value of 1 . 7 × 10 5 ( C) 1 . Answer in units of cm. 002 10.0 points The absolute temperature of a sample of monatomic ideal gas is doubled at constant volume. What effect, if any, does this have on the pressure and density of the sample of gas? Pressure Density 1. Remains the same Doubles 2. Remains the same Remains the same 3. Doubles Remains the same 4. Multiplied by 4 Doubles 5. Doubles Multiplied by 4 003 (part 1 of 2) 10.0 points An air bubble originating from an under water diver has a radius of 9 mm at some depth h . When the bubble reaches the surface of the water, it has a radius of 8 mm. Assuming the temperature of the air in the bubble remains constant, determine the abso- lute pressure at this depth h . The acceleration of gravity is 9 . 8 m / s 2 .

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