Thermal efficiency (non-Carnot) is
A) Q/T.
B) Q/m.
C) 1 – Qcold/Qhot.
D) Q - W.
E) 1 - Tcold/Thot.
C
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A radioactive isotope has a half-life of one month. At the end of one month, the amount of the original isotope still remaining is
1) none, 2) one-quarter, 3) one-half, 4) three-fourths, and at the end of two months, the amount of original isotope remaining is 5) none. 6) one-fourth. 7) one-half. 8) three-fourths.
Which of the following played the most important role in the ring's formation?
A) Saturn's differential rotation B) Saturn's Roche limit C) Saturn's distance from the Sun D) debris from volcanoes on Mimas E) tidal resonance with Titan
In a fission reaction, such as occurs in a nuclear power plant,
A) thermal energy and other forms of energy are converted to nuclear energy. B) nuclear energy is converted to thermal energy and other forms of energy. C) heat is converted to work. D) nuclear energy is created. E) energy is created.
As a space shuttle is launched into orbit, the direction of its acceleration
a. always points upward. b. always points downward. c. varies between pointing upward and pointing downward. d. stays constant.