The body of a swimmer occupies a volume of 2 cubic feet. What is the buoyant force when the swimmer is immersed in water? (The weight density of water is 62.4 pounds per cubic foot.)
124.8 lb
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Which of the following statements about planetary nebulas is correct?
A. They expand at a typical rate of 20 kilometers per second. B. They contain flakes of carbon and silicon material. C. Their shape can be very irregular. D. They are shells of glowing gas and dust ejected by dying Sun-like stars. E. All of these choices are correct.
A moderator is inserted into a fission reaction to absorb neutrons and prevent additional fissions
Indicate whether the statement is true or false
According to Newton's Law of Gravitation, if the distance between two bodies is doubled the attractive force between them becomes
A. half as large. B. one quarter as large. C. twice as large. D. four times as large. E. unchanged.
You can choose between a heat pump and an electric heater to heat your house. If you assume that the electric heater is 100% efficient at turning electrical energy into heat, an electric heat pump of what coefficient of performance (COP) will result in the same cost of electricity for the same amount of heating? Assume that the motor that runs the heat pump is 100% efficient
1.0.25 2.0.5 3.1.0 4.2.0