Radiant energy emitted by our planet is
A) terrestrial energy.
B) the outcome of radioactivity in Earth's interior.
C) electromagnetic.
D) all of the above
Answer: D
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In which case would the net force due to water pressure on a solid object be greater?
(i) when the object is in water at 100-meter depth (ii) when the object is in water at 200-meter depth
1.(i) 2.(ii) 3.Choices (i) and (ii) would have the same net force due to the water on them. 4.It depends on the orientation of the object.Which one of the following is TRUE?
A) Most elliptical galaxies contain only young stars. B) Most galaxies appear to be approaching the Milky Way Galaxy. C) Irregular galaxies rarely have star formation taking place in them. D) Smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the Milky Way. E) Galaxy collisions destroy most of the stars in the galaxies involved.
A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to increase the wavelength is to
a. increase the tension on the hose and shake the end more times per second. b. decrease the tension on the hose and shake the end more times per second. c. increase the tension on the hose and shake the end fewer times per second. d. decrease the tension on the hose and shake the end fewer times per second. e. keep the tension and frequency the same but increase the length of the hose.
A capacitor is connected in series with a resistor and a switch. With the switch open, the capacitor is charged to 9.0 V. When the switch is closed, how long will it take for the voltage across the capacitor to drop to 6.0 V if the time constant of the circuit is 4.0 s?
A. 0.3 s B. 1.2 s C. 1.6 s D. 2.7 s E. 12 s