An ac power generator produces 50 A (rms) at 3600 V. The voltage is stepped up to 100000 V by an ideal transformer and the energy is transmitted through a long distance power line which has a resistance of 100 ohms. What percentage of the power delivered by the generator is dissipated as heat in the long-distance power line?
0.18%
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As an electron slows down from 0.9980c to 0.5000c, how much momentum does it lose? (c = 3.0 × 108 m/s, melectron = 9.11 × 10-31 kg)
What will be an ideal response?
A bit of matter that enters Earth's atmosphere and survives to reach the ground is called
a. a meteor. b. a meteoroid. c. a meteorite. d. a minor planet. e. an asteroid.
A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars. If gm is the free-fall acceleration at the surface of Mars, what is the free-fall acceleration at the location of the satellite?
A) gm/9 B) 0 C) gm D) gm/3 E) gm/16
What is the average translational kinetic energy per molecule of an ideal gas at a temperature of 300 K? The Boltzmann constant is 1.38 × 10-23 J/K
A) 1.7 × 10-21 J B) 8.3 × 10-21 J C) 6.2 × 10-21 J D) 2.1 × 10-21 J E) 4.1 × 10-21 J