What element makes up Io's thin atmosphere?
a. sulfur
b. hydrogen
c. helium
d. carbon dioxide
e. methane
a
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In a reflecting telescope the objective is a ____
a. prism b. mirror c. lens d. diffraction grating e. photographic plate
Addition by 1. Components: The figure shows three vectors, src="https://sciemce.com/media/4/ppg__cp1pbb0313192044__f15g1q36g6.jpg" style="vertical-align: -5.0px;" />.
, 
, and 
, along with their magnitudes. Determine the magnitude and direction of the vector given by 
+ 
- 
Fill in the blank(s) with the appropriate word(s).
An astronaut is traveling at a high rate of speed from the Earth to a distant star system. Observers here on Earth note the relativistic effect that the astronaut's clocks run slow. What relativistic effect, if any, does the astronaut observe?
a. Her pulse rate slows. b. The distance from the Earth to the star system has decreased. c. Her clocks run faster. d. There is no relativistic effect to be observed by the astronaut since she is the one doing the moving.
When evaporation at the ocean surface exceeds precipitation, the salinity of seawater
A) increases. B) decreases. C) stays the same.