Heat Engines: A certain heat engine extracts 1.30 kJ of heat from a hot temperature reservoir and discharges 0.70 kJ of heat to a cold temperature reservoir. What is the efficiency of this engine?
A. 46%
B. 54%
C. 86%
D. 27%
E. 13%
Answer: A
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If the density of the universe is lower than the critical density, this means that:
A) the universe is expanding at a rate equal to the escape speed of the universe. B) the universe is expanding at a rate less than the escape speed of the universe. C) the universe is expanding at a rate greater than the escape speed of the universe. D) the universe is expanding at a rate equal to the speed of light. E) the universe is expanding at a rate greater than the speed of light.
Compared to red light, the wavelength of green light is
A. longer B. the same length C. shorter
The electric field between square the plates of a parallel-plate capacitor has magnitude E
The potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. The magnitude of the electric field between the plates is now equal to A) E/2. B) 2E. C) E/4. D) E. E) 4E.
The magnitude of the magnetic field at point P for a certain electromagnetic wave is 2.12 ?T. What is the magnitude of the electric field for that wave at P? (c = 3.0 × 108 m/s)
A) 745 N/C B) 636 N/C C) 5.23 µN/C D) 7.45 µN/C E) 6.36 µN/C