A general condition that two waves undergo constructive interference is that
A. their phase difference is zero.
B. their phase difference is
C. their phase difference is
D. their phase difference is an even integral multiple of
E. their phase difference is an odd integral multiple of
D. their phase difference is an even integral multiple of
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Which feature of Neptune's atmosphere has disappeared since the Voyager 2 fly-by?
a. white methane clouds b. Great Dark Spot c. belt-zone circulation d. Great Red Spot e. its bluish hue
The energy in the atmospheres of most of the jovian planets comes
A) almost entirely from their interiors. B) almost entirely from the Sun. C) both the Sun and their interiors, with both contributing significantly. D) tidal heating.
Three galaxies, each of mass m = 4.0 × 10^41 kg, lie in a plane at the corners of an equilateral triangle with sides of 5.0 × 10^22 m length. The magnitude of the force the other two galaxies exert on each galaxy is
a. 4.3 × 10^27 N. b. 6.4 × 10^27 N. c. 7.4 × 10^27 N. d. 8.6 × 10^27 N. e. 4.3 × 10^28 N.
Carnot Engine: The ocean thermal energy conversion project uses the surface water near tropical islands with a temperature of 20°C as the hot temperature reservoir, and the water at some depth, with a temperature of 5.0°C, as the cold temperature reservoir for a heat engine. What is the maximum possible efficiency of an engine running between those two temperatures?
A. 4.7% B. 5.1% C. 7.9% D. 15% E. 30%