A charge of 2.0 ?C flows onto the plates of a capacitor when it is connected to a 12. V battery. How much work was done in charging this capacitor?
A) 24. ?J
B) 12. ?J
C) 48. ?J
D) 0.14 mJ
E) 21. ?J
B
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Three engines operate between reservoirs separated in temperature by 300 K. The reservoir temperatures are as follows:
Engine A: Th 5 1 000 K, Tc 5 700 K Engine B: Th 5 800 K, Tc 5 500 K Engine C: Th 5 600 K, Tc 5 300 K Rank the engines in order of their theoretically possible efficiency, from highest to lowest.
1.A, B, C 2.B, C, A 3.C, B, A 4.C, A, BDoes Venus’s surface experience meteorite impacts today? How do you know?
a. Yes. This is confirmed by Venus’s atmospheric composition, especially the abundance of deuterium. b. Not many. Since the atmosphere of Venus is very thick, most meteorites cannot reach the surface of Venus. c. No. Since Venus does not have a magnetic field, it does not attract meteoroids onto its surface. d. Yes. Meteorites fall onto Venus’s surface often because of the planet’s slow retrograde rotation and absence of moons.
Relative to the stars, the Moon moves about ____ eastward in the sky each night
a. 1° b. 5° c. 13° d. 27.3° e. 29.5°
Jane has a mass of 50 kilograms. Express her mass in grams and hectograms
A) 50,000 g; 5,000 hg B) 500,000 g; 500 hg C) 500,000 g; 5,000 hg D) 50,000 g; 500 hg E) 50,000 g; 5,000 kg