Jupiter gives back into space twice the energy it gets from the distant Sun. Where is this energy coming from, for the most part?
A) the impact energy of comets like SL-9
B) helium rain descending into its mantle and core
C) the slow escape of gravitational energy left from its formation
D) the radioactive decay of U-238 in its iron-rich core, just as with the Earth
E) the combined tidal stress of all four large Galilean moons
C
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The difference in blood pressure between the head and the foot of a person who is 2.000 m tall and standing up is (density of blood is 1,060 
A. 155.9 mmHg. B. 142.3 mmHg. C. 126.3 mmHg. D. 102.4 mmHg. E. 198.3 mmHg.
The four fundamental forces that operate in the universe today are ________
A) strong force, weak force, electromagnetic force, gravity B) nuclear force, electromagnetic force, gravity, tidal force C) nuclear force, gravity, electric force, magnetic force D) strong force, weak force, electric force, magnetic force
In the figure below, the current is measured with the ammeter at the bottom of the circuit. When the switch is opened, the reading on the ammeter
A mirror with a focal length 20 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the height of the image?
A) 1.0 cm B) 1.6 cm C) -16 cm D) -1.0 cm E) 16 cm