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Chapter 7: Q32P (page 318)
A certain motor is capable of doing 3000 J of work in 11 s . What is the power output of this motor?
The power output of this motor is 272.2 W.
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An oil company included in its advertising the following phrase: "Energy - not just a force, its power!" In technical usage, what are the differences among the terms energy, force, and power?
Question: In the Niagara Falls hydroelectric generating plant, the energy of falling water is converted into electricity. The height of the falls is about 50m. Assuming that the energy conversion is highly efficient, approximately how much energy is obtained from one kilogram of falling water? Therefore, approximately how many kilograms of water must go through the generators every second to produce a megawatt of power 1 X 106W?
of boiling water (temperature , heat capacity ) are poured into an aluminum pan whose mass is 1050 g and initial temperature (the heat capacity of aluminum is ).
(a) After a short time, what is the temperature of the water?
(b) What simplifying assumptions did you have to make? (1) The thermal energy of the water doesn't change. (2) Thermal energy of the aluminum doesn't change. (3) Energy transfer between the system (water plus pan) and the surroundings was negligible during this time. (4) The heat capacities for both water and aluminum hardly change with temperature in this temperature range.
(c) Next you place the pan on a hot electric stove. While the stove is heating the pan, you use a beater to stir the water, doing 29541 J of work and the temperature of the water and pan increases to . How much energy transfer due to a temperature difference was there from the stove into the system consisting of the water plus the pan?
A box with its contents has a total mass of 36 kg. It is dropped from a very high building. (a) After reaching terminal speed, what is the magnitude of the air resistance force acting upward on the falling box? (b) The box survived the fall and is returned to the top of the building. More objects are put into the box, and the box with its contents now has a total mass of 71 kg. The box is dropped, and it reaches a higher terminal speed than before. After reaching terminal speed, what is the magnitude of the air resistance force acting upward on the falling box? (The fact that the heavier object reaches a higher terminal speed shows that the air resistance force increases with increasing speed.)
At separation in Figure 7.15, what is the physical significance of the quantity A ? Of the quantity B ? Of the quantity C ? In Figure 7.16, which of the states are bound states of a two-atom system? Which are unbound states?
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