A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 650 K and 270 K, performs 4.3 kJ of net work and rejects 8.0 kJ of heat in a single cycle. The thermal efficiency of this heat engine is closest to
A) 0.35.
B) 0.31.
C) 0.28.
D) 0.38.
E) 0.42.
A
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What is special about the ratio distance traveled per unit of time?
A) it is constant for light B) it is relative to a frame of reference C) distance traveled very much depends on time
What do we mean by "The Oxygen Crisis" in relation to the evolution of life on Earth?
A) the extinction of older anaerobic life as oxygen builds up in the atmosphere B) the time period before the development of the ozone layer C) a period when evolution accelerated so rapidly that there was insufficient oxygen available D) the destruction of oxygen in the early atmosphere
At the time of a full moon, an astronaut on the Moon looking at Earth would see a
a. full Earth moon. b. first-quarter Earth moon. c. last-quarter Earth moon. d. new Earth moon.
If light of wavelength 690 nm is used in a double-slit experiment with slit separation 0.206 mm, what angle separates the two 4th order maxima?
a. 
b. 
c. 
d. 
e. 