Two isotopes that undergo nuclear fission are
A) U-235 and Pu-239.
B) Th-238 and U-235.
C) all of these
D) none of these
Answer: A
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The density of air in the previous question would be __________ the density at the surface.
a. one-third b. one-half c. three times d. four times
Most stars radiate much like black bodies. Consider two stars having the same surface temperature, the second having 10 times the diameter of the first. The power radiated per unit area is
A) 102 times larger for the 2nd. B) 10 times larger for the 2nd. C) the same for both. D) 104 times larger for the 2nd. E) 108 times larger for the 2nd.
Determine the resistance R when I = 1.5 A
a.
40 ?
b.
8.0 ?
c.
85 ?
d.
28 ?
e.
32 ?
A 10-kg object, hung by an ideal spring, causes the spring to stretch 2.0 cm. What is the spring constant for this spring?
A) 5.0 N/cm B) 49 N/cm C) 0.20 N/cm D) 20 N/m E) 0.0020 N/cm