The interstellar medium is composed of mainly _____
a. equal parts of gas and dust
b. mostly dust and some gas
c. mostly gas and some dust
d. dust only
e. gas only
c
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Raising the current through a resistor from 8.50 A to 11.3 A increases the power by
A. 33.0%. B. 77.0%. C. 113%. D. 157%. E. 0% (no change).
What do astronomers think is the eventual fate of a white dwarf?
What will be an ideal response?
If a wave has a period of 0.100 sec, it has a frequency of
a. 1/10 Hz. b. 3.2 Hz. c. 100 Hz. d. 10 Hz.
A 30-year-old woman takes a trip on a rocket, leaving her 20-year-old brother behind. She travels at a speed of 0.8c, and is gone 20 years, according to the younger brother. When she returns, how many years older/younger is she than her brother?
a. 2 years younger b. 2 years older c. 3 years older d. 10 years older e. 8 years older