The planet HAT-P-32b has more than twice the radius of Jupiter, yet is only the same mass. It orbits its star more than a factor of ten closer than Mercury's orbit around the Sun. Which is the most plausible explanation for its large size?
A) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter.
B) Planets that are close to a star are hotter, causing them to puff up.
C) It is made of elements other than hydrogen and helium which do not compress under their own gravity.
D) The hydrogen and helium gas compressed under their own gravity.
B) Planets that are close to a star are hotter, causing them to puff up.
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A solar heating system has a 25.0% conversion efficiency; the solar radiation incident on the panels is 800 W/m2 . What is the increase in temperature of 25.0 kg of water in a 1.00-h period by a 3.40-m2-area collector? (cw = 4 186 J/kg/°C)
a. 93.6°C b. 6.88°C c. 23.4°C d. 46.8°C e. 17.5°C
An object is placed 10 cm in front of a concave mirror with a 20-cm focal length. Determine the image location (in cm)
a. ?20 b. ?15 c. ?10 d. ?5 e. 6.7
A box weighing 550N slides at constant speed across a flat parking lot, under the influence of a stiff wind. The wind applies a force of 155N parallel to the surface of the parking lot. What is the angle relative to the vertical of the contact force applied by the ground.
a. 
b. 
c. 
d. 
e. 
A cheetah can maintain its maximum speed of 96.0 km/hr for 26.0 seconds. What minimum distance must a gazelle running 85.0 km/hr be ahead of the cheetah to escape?
a. 96 m b. 79 m c. 40 m d. 73 m e. 67 m