Venus is much hotter than the Earth. Which of the following explains most of this temperature difference?
A) Venus has much more carbon dioxide in its atmosphere.
B) Venus's clouds have a very high reflectivity.
C) Venus rotates backward compared to its orbital rotation.
D) The sunlight reaching Venus is more concentrated because of its closer distance to the Sun.
A) Venus has much more carbon dioxide in its atmosphere.
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Why does the Sun look flattened near the horizon?
A. The Sun is cooler on the horizon, so it looks flattened. B. The larger refraction near the horizon lifts the lower edge of the Sun more than the upper edge and makes the Sun look flattened. C. The Sun's light is reflected off the horizon, making the Sun appear compressed. D. Earth's dense atmosphere compresses the gaseous Sun.
A nuclear reaction, which gives off a total of 1.2 × 10^17 J of energy, expends how much mass in the process? (c = 3.00 × 10^8 m/s)
a. 0.1 kg b. 1.3 kg c. 4.0 kg d. 13.3 kg e. 7.5 kg
An airplane flies 120 km at a constant altitude in a direction 30.0° north of east. A wind is blowing that results in a net horizontal force on the plane due to the air of 2.40 kN in a direction 10.0° south of west
How much work is done by the air on the plane? A) -2.70 × 108 J B) -0.985 × 108 J C) -221 × 108 J D) 221 × 108 J E) 0.821 × 108 J
A nonrelativistic proton is confined to a length of 2.0 pm on the x-axis. What is the kinetic energy of the proton if its speed is equal to the minimum uncertainty possible in its speed?
(1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s, mproton = 1.67 × 10-27 kg) A) 5.1 eV B) 51 eV C) 510 eV D) 5100 eV E) 51,000 eV