The average mass of the atoms of an element in naturally occurring samples is called the ______________ mass of the element
a. atomic
b. average
c. relative
d. molecular
a
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Consider the situation described in problem E9T.10. If current flows in the loop, the magnetic field will exert magnetic forces on the various loop legs, and in some cases there may be a net magnetic force on the loop. If so, we will have to exert a force to keep the loop moving at a constant velocity. In each of the five cases, determine whether the net force we have to exert is The loop has not yet entered the magnetic field.
A. forward (in the +x direction).
B. backward (in the -x direction).
C. zero.
D. some other direction (specify).
Moonquakes on the Moon were detected by:
A) the radar observations over time from Earth. B) the seismographs left these by the Apollo astronauts. C) laser beams reflected off mirrors left on the Moon by Apollo missions. D) seismographs attached to the Russian Lunar rovers. E) telescopic observations of lunar landslides.
Suppose a bug spatters upon your windshield as you drive down the road. Which sustains the greater change of momentum?
A) insufficient information B) the bug C) both the same D) the car
If the Moon is 3rd quarter phase, what shape does it have in the sky?
A) a half circle B) a quarter circle C) a full circle D) nothing (It is impossible to view a 3rd quarter moon.)