An example of a heat mover is a(n)
a. refrigerator
b. air conditioner
c. heat pump
d. all of the above
e. none of the above
D
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Arnold can bench press 315 pounds in his gym in California. That is exactly six big 45-pound weight plates and the 45-pound bar. He can lift all that one time, but he cannot lift 325 pounds even once. At the NASA gym on the Moon, Arnold would
A. be unable to bench press 315 pounds due to weak gravitational field of the Moon. B. be able to bench press more than 315 pounds. C. be able to bench press the bar and more than 6 weight plates.
Consider two less-than-desirable options. In the first you are driving 30 mph and crash head-on into an identical car also going 30 mph
In the second option you are driving 30 mph and crash head-on into a stationary brick wall. In neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. Which of these two situations would result in the greatest impact force? A) hitting the brick wall B) hitting the other car C) The force would be the same in both cases. D) We cannot answer this question without more information. E) None of these is true.
A blacksmith drops a 550 °F piece of iron into a vat of 75 °F water in order to cool it to 100 °F. How many kilograms of water are needed per kilogram of iron? Assume all the thermal energy from the iron is transferred to the water and none of the water evaporates. The specific heats of water and iron are 4186 J/kg/°C and 448 J/kg/°C, respectively
a. 9.3 kg b. 0.78 kg c. 0.52 kg d. 1.9 kg
What is the quantum number n of a particle of mass m confined to a one-dimensional box of length L when its momentum is 4h/L?
a. 1 b. 4 c. 2 d. 8 e. 16