Suppose that, in Iceland, scientists discover geothermal vents that produce pressurized steam at 300°C. Engineers construct a heat engine that uses this steam as a hot reservoir and a nearby glacier as a cold reservoir. What is the maximum possible efficiency of this engine
A. 300%
B. 100%
C. 52%
D. 45%
E. 22%
F. Other
C. 52%
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A friction force
A. is a contact force that acts parallel to the contact surfaces. B. is a normal force between contact surfaces. C. is a scalar quantity since it can act in any direction along a surface. D. does not depend on the nature of the surfaces.
Danny Diver weighs 500 N and steps off a diving board 10 m above the water. Danny hits the water with kinetic energy of
A) 10 J. B) 500 J. C) 510 J. D) 5000 J. E) more than 5000 J.
The Earth's density increases with depth. If instead the Earth had uniform density, but the same angular velocity and mass, how would its rotational kinetic energy compare to the actual value?
a. It would be the same as the actual value. b. It would be less than the actual value. c. It would be greater than the actual value. d. More information is needed to find the answer.
The binding energy of the hydrogen atom in its ground state is -13.6 eV. What is the energy when it is in the n = 5 state?
A) 2.72 eV B) -2.72 eV C) 0.544 eV D) -0.544 eV E) -68 eV