The theory of continental drift is attributed to
A) H.H. Hess.
B) Alfred Wegener.
C) W. Loma Prieta.
D) Simon Tectonic.
Answer: B
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Answer the following statement(s) true (T) or false (F)
One can raise a quantity q to a power a when a has units.
A machinist needs to remove a tight fitting pin of material A from a hole in a block made of material B. The machinist heats both the pin and and the block to the same high temperature and removes the pin easily
What statement relates the coefficient of thermal expansion of material A to that of material B? A) Material B has a greater coefficient of expansion than does material A. B) The situation is not possible, heating block B will shrink the hole in the material as the material expands with increasing temperature. C) Material B has the same coefficient of expansion as does material A. D) Material B has a negative coefficient of expansion and A has a positive coefficient of expansion. E) Material A has a greater coefficient of expansion than does material B.
The 1560 kg solid steel door to a bank vault is 2.00 m high, 1.00-m wide and 10-cm thick. One hinge is 60.0 cm down from the top on the left-hand side of the door. The other hinge is 30.0 cm up from the bottom. What horizontal force, in what direction, does the door exert on the upper hinge?
A. 6950 N, left B. 6950 N, right C. 7640 N, left D. 7640 N, right E. 15,300 N, left
The three fusion reactions in the Sun that form helium from hydrogen are together called the
a. proton-proton chain. b. hydrogen cycle. c. helium sequence. d. neutrino exchange.