A heat engine absorbs 2 500 J of heat from a hot reservoir and expels 1 000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2 500 J of heat to the hot reservoir, requiring 1 500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?
a. 1.0 (no)
b. 1.0 (yes)
c. 1.5 (yes)
d. 1.5 (no)
e. 2.5 (no)
B
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Our most detailed knowledge of Uranus and Neptune comes from:
A) spacecraft exploration. B) the Hubble Space telescope. C) ground based visual telescopes. D) ground based radio telescopes. E) manned missions.
What technology do astronomers use to search for extraterrestrial life??
a. space observatories
b. radio telescopes
c. refracting telescopes
d. reflecting telescopes
e. FM radio and televisions
A superconductor expels any magnetic field from its interior. This is called __________
Fill in the blank(s) with correct word
When a grating having 5000 lines/cmis illuminated by monochromatic light, the angle between the central maximum and the fourth order maximum is 47.2°. What is the wavelength of the light?
A) 138 nm B) 183 nm C) 367 nm D) 637 nm