A reversible engine takes in energy at a rate of 555 W and exhausts energy at 482 W
(a) How much power does it produce?
(b) What is its efficiency?
(c) If operated in reverse as a refrigerator, what would be its performance coefficient (COP)?
(a) 73 W (b) 13.2% (c) 6.6
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Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 20 km/s/Mly. How fast would a galaxy 1000 Mly distant be receding from us?
A) 20,000 km/s B) 20 Mly/s C) 0.20 times the speed of light D) 50 km/s E) 20 km/s
Ohm's Law: The current through a piece of lab equipment must be limited to 2.75 A when it is run by a 120-V dc power supply. What must be the resistance of this equipment?
Fill in the blank(s) with the appropriate word(s).
At a fixed depth within a fluid at rest, the pressure pushing upward is
A) less than the pressure pushing downward. B) zero, because pressure only pushes equal in all horizontal direction. C) zero, because the fluid above does not support the weight of the fluid below. D) greater than the pressure pushing downward. E) equal to the pressure pushing downward.
Detailed study of stellar spectra in 1897, which enabled the development of the H-R diagram, was performed by:
A) E.C. Pickering. B) Harlow Shapley. C) James Lick. D) John Herschel. E) Antonia Maury.