A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?
A) upward
B) northward
C) southward
D) eastward
E) westward
E
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If the input to an RLC series circuit is 
, then the current in the circuit is
A.
.B.
.?C.
.D.
.E.
.A cannonball fired from a long-barrel cannon will have a greater muzzle velocity because the cannonball receives a greater
A) force. B) impulse. C) both of these D) none of the above
Two velocity vectors are added: one of magnitude 2.0 m/s and one of magnitude 4.0 m/s. Not knowing the respective directions, we can say that the magnitude of the sum of the vectors will be
A. less than 2.0 m/s. B. between 6.0 m/s and 4.0 m/s. C. 2.0 m/s. D. 6.0 m/s. E. between 6.0 m/s and 2.0 m/s.
Imagine you are holding a long rope under tension attached to a distant support. You can generate periodic waves by shaking the end up and down. Changing which of the following will least affect the velocity of waves along the string?
A. Tension B. Frequency C. Mass per unit length of rope D. None of these choices affect the wave speed