The intensity of light from the Sun is 1.3 kW/m2 at the distance of the Earth. The Earth's radius is 6.4 × 10^6 m. If all the sunlight that hits the Earth were absorbed, what would be the magnitude of the resulting force on the Earth?
a. 0.0087 N
c. 5.6 × 10^8 N
b. 1.8 × 10^8 N
d. 87 N
C
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When we say that Jupiter is at opposition, we mean that it
A) appears on the opposite side of the sky from the Sun, so that it is on our meridian at midnight. B) is behind the Sun as seen from Earth, so that it appears close to the Sun in our sky. C) is at its greatest western elongation. D) is at the point in its orbit where it is farthest from the Sun.
Via the rotation curve method, we can estimate the mass of galaxies like M31 from
a. Doppler shifts of material at the edge of its disk and computing P = 2?r/v. b. the distances of the Doppler shift points from its center. c. Doppler shifts of material at the edge of its disk and computing P = 2?r/v and the distances of the Doppler shift points from its center. d. It is impossible to estimate the mass of M31.
Thermodynamic Devices: An ideal reversible heat pump is taking heat from the outside air at -10.0°C and discharging it into the house at 18.0°C. What is the coefficient of performance of this heat pump?
A. 10.4 B. 9.44 C. 0.644 D. 0.533 E. 0.0962
The water level in a water tower is 50.00 m above the ground. What is the gauge pressure of the water at a faucet that is 2.000 m above the ground?
A. 500,200 
B. 470,400
C. 451,300
D. 422,400
E. 410,400