A heat engine absorbs 64 kcal of heat each cycle and exhausts 42 kcal
(a) What is the efficiency of this engine?
(b) How much work does this engine do per cycle?
What will be an ideal response?
(a) 34% (b) 22 kcal
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Doppler-shift observations of a spectroscopic binary star can enable astronomers to calculate ________ of its individual stars
a. the minimum masses b. the sizes c. both minimum masses and sizes d. neither minimum masses nor sizes
The strength of the Coriolis effect depends on
A) a planet's distance from the Sun. B) the amount of greenhouse gases in the atmosphere. C) a planet's size and rotation rate. D) a planet's temperature. E) the tilt of a planet's axis.
Which of the following is needed in order to produce a uranium fission bomb?
A) an isotope separation, or enrichment, facility B) plutonium C) deuterium and tritium D) All of the above. E) None of the above.
Sunspots are dark because
a. regions of the photosphere are obscured by material in the chromosphere. b. shock waves move through the photosphere. c. the sun rotates differentially. d. the strong magnetic field inhibits the currents of hot gas rising from below. e. they radiate their energy into space faster than the rest of the photosphere.