Two spaceships approach Earth from the same direction. One has a speed of 0.21c and the other a speed of 0.34c, both relative to Earth. What is the speed of one spaceship relative to the other?
A) 0.13c
B) 0.14c
C) 0.15c
D) 0.16c
E) 0.18c
B
Physics & Space Science
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The axes on a Hertzsprung-Russell (H-R) diagram represent
A) luminosity and surface temperature. B) mass and luminosity. C) luminosity and apparent brightness. D) mass and radius.
Physics & Space Science
The number of electrons delivered daily to an average American home by an average power utility in the early 21st century was
A) zero. B) 110. C) 220. D) billions of billions. E) none of the above
Physics & Space Science
A uniform rod (mass m = 1.0 kg and length L = 2.0 m) pivoted at one end oscillates in a vertical plane as shown below. The period of oscillation (in s) is approximately
?
?
a.
4.0.
b.
1.6.
c.
3.2.
d.
2.3.
e.
2.0.
Physics & Space Science
Briefly describe Mars's surface
What will be an ideal response?
Physics & Space Science