When heating 2 kg of ice from –40°C, 2 kg of water from 20°C to 50°C, and 2 kg of steam from 100°C to 125°C, which requires the most energy?
a. the ice
b. the water
c. The steam, it's obvious since it is the hottest.
d. All three take the same amount.
b
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Friction: A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30, and the coefficient of kinetic friction is 0.20. What horizontal force must be applied to the box to cause it to start sliding along the surface?
Fill in the blank(s) with the appropriate word(s).
Which contributes more to the cost of your electric bill each month, a 1500-Watt hair dryer or a 600-Watt microwave oven?
a) hair dryer b) microwave oven c) both contribute equally d) depends upon what you cook in the oven e) depends upon how long each one is on
When the measured quantity 45.67 kg is divided by the measured quantity 3.42 L, the answer should have how many significant figures?
a. Three b. One c. Four d. Two
Materials A, B, and C have R values of 1, 4, and 8 ft2-°F-hr/Btu, respectively. If the rate of heat transfer through material A alone is 20 Btu/hr, then the rate of heat transfer through the combination of A, B and C is _____
a. 1.5 b. 2.5 c. 4.0 d. 7.0 e. 80 Btu/hr