In a negatively-curved Universe (like the surface of a saddle), the angles of a triangle add up to
A. exactly 180 degrees.
B. less than 180 degrees.
C. more than 180 degrees.
Answer: B
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Phase Angles: In the circuit shown in the figure, the 60-Hz ac source has a voltage amplitude of 120 V, the capacitive reactance is 800 ?, the inductive reactance is 300 ?, and the resistance is 560 ?. What is the phase angle?
A. -42° B. +42° C. -69° D. +69° E. -21°
A ball is subjected to a pressure of 2.0 atmospheres. The un-squeezed diameter of the ball is 10.0 cm. The squeezed diameter of the ball is 9.999 cm. The bulk strain on the ball is
a. 
b. 
c. 
d. 
e. 
How many grams of U-235 must be fissioned every day to produce 1000 MW of electricity in a nuclear power plant that is 1/3 efficient? [Assume 208 MeV/fission and 1 MeV = 1.6 × 10^?13 J]
In which stage of a star's evolutionary cycle does it spend the most time?
A. the post-main sequence B. the pre-main sequence C. the main sequence D. It depends on the mass of the star.