What proportion of their lives do stars spend fusing hydrogen to helium in their cores?
A) 90%
B) 70%
C) 50%
D) 10%
A
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The unit of capacitance, the farad, is dimensionally equivalent to which of the following?
a. V/C b. V?C c. J/V d. C/V
Energy transfer by convection is primarily restricted to
A) solids. B) liquids. C) gases. D) fluids. E) none of the above
Ohm's Law: For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?
A. power B. resistivity C. 1/(resistivity) D. resistance E. 1/(resistance)
Light consisting of a mixture of red and blue light enters a 40°, 70°, 70° prism along a line parallel to the side opposite the 40° vertex. The index of refraction of the prism material for blue light is 1.530,
and for red light it is 1.525. What is the angle between the two emerging beams of light? A) 0.5° B) 0.9° C) 0.1° D) 0.3° E) 0.7°