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A mountain climber wears a goose down jacket 3.3cm thick with total surface area 1.2m^2 . The temperature at the surface of the clothing is -20C and at the skin is 34 C .
Part A Determine the rate of heat flow by conduction through the jacket assuming it is dry and the thermal conductivity k is that of down. Express your answer using two significant figures. Q/t=_____W
Part B Determine the rate of heat flow by conduction through the jacket assuming the jacket is wet, so k is that of water and the jacket has matted to 0.40 cm thickness. Express your answer using two significant figure. Q/t=_____W
What approximations or simplifying assumptions must you make in the calculations? (Note: Some of these choices are false because they are wrong physics!)
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A 2.78-kg steel ball strikes a massive wall at 10.0 m/s at an angle of ? = 60.0° with the plane of the wall, what is the average force exerted by the wall on the ball
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