Fission fragments tend to be radioactive because they have
A)
more protons than neutrons.
B)
more neutrons than protons.
C)
too many more protons than neutrons.
D)
too many more neutrons than protons.
E)
the same number of neutrons as protons.
D
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What is thought to be the reason that there are no small impact craters on Mars?
A) Like Venus, Mars' atmosphere is too thick and these meteorites do not survive to make impacts on the surface. B) The surface of Mars is too young to have impact craters. C) Due to the gravitational pull of Mars' moons, most small meteoroids are deflected and never make it to the surface. D) The wind blows small dust particles, eroding the surface of Mars, erasing small impact craters faster than they can form. E) None of the above. Mars has lots of small impact craters.
The normal force is always equal to the force of gravity
Indicate whether the statement is true or false
If a 22 
resistor has a current of 2.0 A flowing through it, what is the potential difference across it?
A. 0.091 V B. 44 V C. 11 V D. 24 V E. 20 V
If all the "dark matter" in the Universe were somehow instantaneously removed, which of the following would happen?
A) The Solar System would fly apart. B) All the stars in the Milky Way would collapse into the central black hole. C) Clusters of galaxies would no longer be gravitationally bound together. D) Atoms would split into nuclei and free electrons.