Two bodies with masses m1 and m2 are both moving east with velocities of magnitudes v1 and v2, where v1 is less than v2 . The magnitude of the velocity of the center of mass of this system of two bodies is
a. less than v1.
b. equal to v1.
c. equal to the average of v1 and v2.
d. greater than v1 and less than v2.
e. greater than v2.
d
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Your friend left your house and is now driving 40 miles per hour, but she has been speeding up the whole time since she left your house, and has gone 10 miles. How long has she been driving?
A) shorter than 15 minutes B) longer than 15 minutes C) 15 minutes
In order for a photon to eject an electron from a metal's surface in the photoelectric effect, the photon's
A) frequency must be greater than a certain minimum value. B) speed must be greater than a certain minimum value. C) wavelength must be greater than a certain minimum value. D) momentum must be zero.
Astronomers who subscribe to the Big Bang theory believe the Big Bang occurred
A) about 14 billion years ago. B) at the beginning of time. C) both of these D) neither of these
A device used by Charles Coulomb to measure the presence or absence of electric charge is called a(n) ________
Fill in the blank(s) with the appropriate word(s).