An Earth satellite in an elliptical orbit has its smallest speed
A) closest to Earth.
B) when getting farther from Earth.
C) when farthest from Earth.
D) need more information
Answer: C
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The most distant stars we can measure stellar parallax for are approximately
A) 50 parsecs away. B) 500 parsecs away. C) 5,000 parsecs away. D) halfway across the Milky Way Galaxy. E) in the Andromeda Galaxy.
It is unlikely that we will be able to detect the signals from civilizations in other galaxies because
A) signals from other galaxies will be severely weakened by distance, making them far harder for us to detect B) other galaxies are unlikely to harbor intelligent civilizations C) signals from civilizations on other galaxies will not reach us before we give up listening D) they will most likely transmit at wavelengths that will be absorbed by intergalactic gas
If Earth's axis were tilted at 40°, the seasons of the year would
a. be shorter. b. be harsher. c. be longer. d. not change. e. be milder.
If I double the mass per unit length of guitar string, its natural frequency changes by what factor?
a. 2.0 c. 1.0 b. 1.4 d. 0.71