Radio telescopes are important in astronomy because
a. they can detect cool hydrogen.
b. they have high magnification.
c. the can detect interstellar dust clouds.
d. they are very inexpensive to build on tops of mountains.
e. they don't need to be as large as optical telescopes to achieve the same resolving power.
A
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A star whose mass is 5 times larger than the Sun's and whose luminosity is 100 times larger than the Sun's has a main sequence lifetime about
A. 5 times longer than the Sun's. B. 5 times shorter than the Sun's. C. 20 times shorter than the Sun's. D. 100 times shorter than the Sun's. E. 500 times longer than the Sun's.
Compared to the volume of a kilogram of feathers, the volume of a kilogram of lead is
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A circuit joins points A, B, C and D into a single square loop. The voltage drop from A to B, B to C and C to D are -5.2V, 2.1V, and 1.0V, respectively. If one were to measure the voltage drop from C to B, one would obtain:
A. 2.1V B. -4.1V C. -6.1V D. -2.1V E. 4.1V F. 6.1V