You travel 2640 feet in thirty seconds while in a 65 mi/hr zone. (There are 5280 ft in one mi.) Your average speed is
A. less than the speed limit.
B. larger than the speed limit.
C. exactly the speed limit.
Answer: A
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A 7 cm diameter heat exchanger rod at 400ºC is surrounded by a 15 cm diameter heat shield. If the surroundings are a black body at 20ºC, determine the equilibrium temperature of the shield if (a) both rod and shield are black bodies, (b) emissivity of both is 0.7, and (c) the rod is a black body and the shield has emissivity of 0.7.
Why can't the Moon always pass through the center of the umbra? a. The Moon's rotation is slightly faster than its revolution around Earth. b. The Moon's orbit is inclined by 5 degrees to the plane of Earth's orbit. c. The Moon's synodic cycle changes a few minutes per cycle
d. The Moon's orbit changes with the seasons. e. The Moon is not in its full moon lunar phase.
Your rearview mirror states "OBJECTS IN THIS MIRROR ARE CLOSER THAN THEY APPEAR." The mirror is
A. convex B. concave C. planar
A 100-kg student eats a 200-Calorie doughnut. To "burn it off", he decides to climb the steps of a tall building. How high (in m) would he have to climb to expend an equivalent amount of work? (1 food Calorie = 103 calories.)
a. 273 b. 623 c. 418 d. 854 e. 8 400