A satellite engine has an exhaust speed of 2.80 × 10^4 m/s and ejects ionized gas at a rate of 2.50 × 10^–6 kg/s. What is the instantaneous thrust of the engine?
a. 8.93 × 10^–11 N
b. 7.00 × 10^–2 N
c. 5.30 × 10^2 N
d. 1.12 × 10^10 N
b
Physics & Space Science
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Polaris is 132 pc from Earth and has an absolute visual magnitude of –3.1 . What is the apparent visual magnitude of this star?
a. 0.74 b. 1.18 c. 0.5 d. 2.5
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Spectral lines shifted toward higher frequencies are called ________.
A. red shifted B. blue shifted C. Lines cannot be shifted toward higher frequencies.
Physics & Space Science
The more massive a star is, the longer it lives because it has more hydrogen to fuse into helium.
Answer the following statement true (T) or false (F)
Physics & Space Science
About how hot was the Big Bang when matter and energy "decoupled"?
A) 900 million K B) 15 million K C) 3,000 K D) 300 K E) 2.73 K
Physics & Space Science