If all the uranium in the world were exhausted, breeder reactors would be
A) in greater demand.
B) relics of a brief age.
C) both of these
D) neither of these
Answer: B
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Two wires, one copper and the other steel, of equal length stretch the same amount under an applied load P. The moduli of elasticity for each is Es 5 210 GPa and Ec 5 120 GPa. The ratio of the diameter of the copper wire to that of the steel wire is approximately:
(A) 1.00
(B) 1.08
(C) 1.19
(D) 1.32
When droplets of condensation form on the outside of a glass of ice water, it must be that in the air right next to the glass
a. the temperature is near the dew point b. the humidity is near the saturation density c. the relative humidity is near 100% d. all of the above
The yield strength of metals is proportional to the negative _________ power of the grain diameter.
Fill in the blank(s) with the appropriate word(s).
A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N) is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s2. What is the magnitude of the force of friction acting on the block?
A. 2.0 N B. 1.4 N C. 1.6 N D. 2.8 N E. 3.4 N