Midterm%202%20Solution

# Midterm%202%20Solution - Q1 You are enjoying a trip in a...

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Q1 You are enjoying a trip in a small boat when suddenly a big wave causes you to fall into the water. What’s the main heat loss mechanism while you are submerged fully clothed in the water? 1) Conduction 2) Convection 3) Radiation Q2 The heat loss of a house to the outside in winter is mainly due to heat conduction. When the temperature difference between outside and inside is doubled, the energy needed to heat the house is 1) doubled; 2) tripled; 3) halved; 4) the same. Q3 Human bodies radiate mainly 1) at ultraviolet wavelengths; 2) visible lights; 3) at infrared wavelengths; 4) radio waves.

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Q4 A skater, Joe, is in Energy Skate Park to test a track. Joe comes down from an initial height of 5m above the lowest point of an almost frictionless track with speed at 36km/hr. His weight is 60kg. How fast does Joe move when he passes the lowest point of the track for the first time? Because small frictions are present, after going up and down for many times, Joe finds that he finally comes to a complete stop. How
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Midterm%202%20Solution - Q1 You are enjoying a trip in a...

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