Which is a characteristic of irregular satellites?
a. prograde rotation
b. orbit closely to parent planet
c. spherical shape
d. highly inclined orbit
e. relatively large in size
d
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If the Earth were represented as a basketball (˜10 in. in diameter) and the Moon as a baseball (˜3 in. in diameter) then, to order of magnitude, what size would best represent the diameter of the Sun?
a. 10 ft b. 100 ft c. 1000 ft d. 10000 ft
An electron a distance d from a proton feels an electrostatic force of magnitude 
. Imagine that we move the electron so that it is a distance 2d from a helium nucleus (which has two protons and two neutrons). The magnitude of the force on the electron now is b , where b is
A. 4 B. 2 C. 1 D. 1/2 E. 1/4
What spacecraft was intentionally destroyed in 2003 so that it could not hit Europa?
A) Cassini B) Voyager 2 C) Galileo D) Huygens E) Pioneer 11
What is meant by "the heat death of the universe"?
A) The universe will end in a giant inferno. B) The universe will reach thermal equilibrium. C) Some day the sun will explode and we will all burn. D) Some day the sun will cease to provide electromagnetic radiation. E) The radiation from the stars will continuously heat up the universe.