Humans cannot survive on the surface of Mars for long periods of time because
a. there is not enough oxygen in the atmosphere.
b. the range in temperature between day and night is too large.
c. the flux of UV radiation reaching the surface is too high.
d. the atmospheric pressure would be too low.
e. all of the above
e. all of the above
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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).
A surveyor stands 100 m from the base of a building, and uses a transit to determine that the angle of elevation to the building's roof is 19.0°. If the transit height is 0.80 m, what is the height of the building?
a. 94.6 m b. 95.4 m c. 35.2 m d. 34.4 m
Light from a 560-nm monochromatic source is incident upon the surface of fused quartz (n = 1.56) at an angle of 30°. What is the angle of reflection from the surface?
a. 30° c. 60° b. 75° d. 15°
Nuclear Binding Energy: The stability of 
Cl with respect to alpha, beta-plus and beta-minus decay is to be determined. The following atomic masses are known:
A. not subject to alpha, beta-plus or beta-minus decay. B. subject to alpha decay only. C. subject to beta-plus decay only. D. subject to beta-minus decay only. E. subject to beta-plus or beta-minus decay, but not to alpha decay.