As the solar nebula contracts, it
A) cools due to condensation.
B) reverses its direction of rotation.
C) loses angular momentum.
D) spins faster due to conservation of angular momentum.
E) flattens out into the ecliptic plane around the Sun's poles.
D
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A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point
A) down the ramp. B) up the ramp. C) vertically downward. D) perpendicular to the ramp. E) None of the above choices is correct.
Which of the following involves the greatest heat transfer?
a. One gram of steam at 100°C changing to water at 100°C. b. One gram of ice at 0°C changing to water at 0°C. c. One gram of water cooling from 100°C to 0°C. d. One gram of ice heating from -100°C to 0°C.
The universal accelerating force could NOT be considered:
A) antigravity. B) Einstein's cosmological constant. C) dark energy. D) vacuum pressure. E) dark matter.
An AC power generator produces 25 A (rms) at 3600 V. The energy is transmitted through a long-distance power line, which has a total resistance of 50 W. What percentage of the power delivered by the generator is dissipated as heat in the long-distance line if a step-up transformer is not used?
a. 69% c. 0.09% b. 35% d. 1.8%