Calculate the percentage composition by mass (to the nearest 0.1) of each element in sodium sulfide, Na2S
58.9% Na, 41.1% S
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The images below show six objects in our solar system. Rank these objects by size (average equatorial radius), from largest to smallest. (Not to scale.)
Dark energy accounts for what percent of the known energy in the universe?
A) 68% B) 24% C) 8% D) 94%
As measured from the Earth, a spacecraft is moving at speed 0.80c when it releases a probe at speed 0.60c relative to the spacecraft in a forward direction. What would be the speed of the probe as measured from the Earth?
a. 0.70c b. 0.81c c. c d. 0.95c
What is a magnetosphere?
A) the uppermost layer of any planetary atmosphere B) the layer of a planet in which its magnetic field is generated C) the region in a planet's atmosphere in which auroras occur D) a region of space around a planet in which the planet's magnetic field can trap charged particles