The main problem spacecraft have encountered in landing on Venus is:
A) the thick atmosphere.
B) the acid rain.
C) the strong winds.
D) the rocky surface.
E) the extremely high temperatures.
E
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Stellar spectra tell us that ________ is the second most abundant element in the Sun
A) carbon B) helium C) iron D) hydrogen E) oxygen
A helium balloon rises because of
a. Archimedes' principle. b. Pascal's principle. c. Bernoulli's principle. d. Torricelli's principle. e. none of these principles.
Dimensional Analysis: The gravitational force of attraction F between two tiny masses m1 and m2 that are separated by a distance r is F = G 
. In the SI system, force has units of kg ? m/s2 . Use the given gravitational force formula to determine the SI units of G in terms of the fundamental quantities of mass, length, and time.
Fill in the blank(s) with the appropriate word(s).
A source of sound waves is placed at the center of a very large sound-reflecting wall. The source emits 0.500 W of power. Two meters from the source the intensity in W/m2 is
a. 9.95 × 10^?3. b. 1.99 × 10^?2. c. 0.313. d. 0.399. e. 0.625.