If a heat engine has an efficiency of 28.0% and its power output is 540 W, what is the rate of heat input from the combustion phase?
a. 151 W
b. 2 030 W
c. 1 930 W
d. 1 830 W
e. 1 730 W
c
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If you were all powerful, how could you make the difference between a planet's night and day temperatures larger?
A) Increase the greenhouse gas content of the planet's atmosphere. B) Increase the tilt of the planet's rotation axis. C) Make the planet rotate more slowly. D) Increase the number of impact craters on the planet.
A point charge Q is placed on the x axis at x = ?2.0 m. A second point charge, ?Q, is placed at x = 1.0 m. If Q = 60 ?C, what is the magnitude of the electrostatic force on a 40-?C charge placed at the origin?
a. 16 N b. 27 N c. 32 N d. 11 N e. 3.0 N
A large water storage container is filled to a depth of 3.0 m. The volume above the water is filled with air. In order to pump the water from the container, the air pressure in the container is increased by 3.0 105 N/m2 . What happens to the pressure in the water at a depth of 1.0 m when the air pressure is increased?
a. Nothing, it is still at a depth of 1.0 m and the pressure in the water depends only on the depth. b. It increases by 1.0 105 N/m2, since it is at 1/3 the depth of the water. c. It increases by 2.0 105 N/m2, since it is at 2/3 the depth from the bottom of the container. d. It increases by 3.0 105 N/m2. e. It increases by 3.0 105 N/m2 + 9.8 103 N/m2 since it is 1.0 m deep in the water.
A spool of thread has an average radius of 1.00 cm. If the spool contains 47.5 m of thread, how many turns of thread are on the spool? "Average radius" allows us to not need to treat the layering of threads on lower layers
a. 15.1 b. 756 c. 149 d. 7.56