Which planet may have helium rain in its interior, and what does this rain do?
A) Saturn, where it generates heat as it falls downward
B) Uranus, where it makes the ground wet
C) Neptune, where it is restructuring the planet's interior
D) Jupiter, where it may be an energy source for the Great Red Spot
A) Saturn, where it generates heat as it falls downward
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Three 1.0 
C charges are placed along the x-axis, one charge at x = -10 cm, another at the origin, and the last one at x = 10 cm. What is the total potential energy of this arrangement?
A. 0.27 J B. -0.27 J C. 0.72 J D. 0.23 J E. infinite (or indeterminate)
The closest known star to our solar system is Alpha Centauri, which is approximately 4.30 light years away. A spaceship with a constant speed of 0.800c relative to the earth travels from Earth to this star
(a) How much time would elapse during the trip on a clock on board the spaceship? (b) How much time would elapse during the trip on a clock on Earth? What will be an ideal response?
Suppose we imagine the Sun to be about the size of a grapefruit. Which of the following describes the size and distance of Earth on the same scale?
A) Earth is the size of a tip of a ballpoint pen about 1 meter away from the Sun. B) Earth is the size of a golf ball about 1 meter away from the Sun. C) Earth is the size of a tip of a ballpoint pen about 15 meters away from the Sun. D) Earth is the size of a golf ball about 15 meters away from the Sun. E) Earth is the size of a marble about 25 miles away from the Sun.
A spring (k = 600 N/m) is placed in a vertical position with its lower end supported by a horizontal surface. The upper end is depressed 20 cm, and a 4.0-kg block is placed on top of the depressed spring. The system is then released from rest. How far above the point of release will the block rise?
a. 46 cm b. 36 cm c. 41 cm d. 31 cm e. 20 cm