What technique for measuring distance can you use to discover Hubble's Law?
A.) Cepheid variables in galaxies.
B.) White dwarf supernovae in galaxies.
C.) Redshifts of bright objects in galaxies.
D.) A and B.
E.) All of the above.
Ans: D.) A and B.
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The center of mass of an object has to be located within the object
Indicate whether the statement is true or false
The Coulomb constant, k, has a value of 
The permittivity of free space,
has the units
A. 
B. N·m/C.
C. 
D. 
E. that are not given.
Suppose we could magically double the mass of the moon, double the mass of Earth, and double the distance between Earth and the moon, all at the same time. How would this affect the force that the moon exerts on Earth?
A) The force would be halved. B) The force would be quadrupled. C) The force would be doubled. D) The force would be unchanged. E) The force would be multiplied by eight.
A mass is attached to a vertical spring and bobs up and down between points A and B. Where is the mass located when its kinetic energy is a minimum?
A) midway between A or B B) at either A or B C) one-fourth of the way between A and B