An aluminum bar (E 5 70 GPa, ? 5 0.33) of diameter 20 mm is stretched by axial forces P, causing its diameter to decrease by 0.022 mm. The load P is approximately:
(A) 73 kN
(B) 100 kN
(C) 140 kN
(D) 339 kN
(A) 73 kN
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What is a superbubble?
A) a very low-density region of interstellar space, formed by the merger of several bubbles B) a very high-density region of interstellar space, filled with gas ejected from nearby star systems C) a bubble so large that it fills much of the galactic halo D) the region of space cleared by a powerful supernova E) a cloud of gas that can form a million or more stars
The type of radiation that fogged Becquerel’s photographic plates was probably
A. Alpha radiation. B. Beta radiation. C. Gamma radiation. D. Either alpha or beta radiation. E. Either beta or gamma radiation.
If there is a full moon visible from Paris one evening, twelve hours later in Australia there will be a ________ visible.
A. full moon B. first quarter moon C. crescent moon D. new moon
The amount of heat transferred to a system can be measured in _______.
Fill in the blank(s) with the appropriate word(s)