The Earth has a radius of about 6000 km. How long would it take for an object traveling at the speed of light to circle the Earth? (Recall that the speed of light is 300,000 km/s.)
A) 1/300,000 of a second (0.0000033 s)
B) 1/6000 of a second (0.000017 s)
C) 1/8 of a second (0.0125 s)
D) 1/2 of a second (0.5 s)
C) 1/8 of a second (0.0125 s)
Physics & Space Science
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A wire carries a steady current of 0.1 A over a period of 200 s. What total charge passes through the wire in this time interval?
a. 2 C c. 0.005 C b. 200 C d. 20 C
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The absolute magnitude of the Sun is
A) -26.7. B) -12.1. C) 0. D) +4.8. E) +26.7.
Physics & Space Science
Globular clusters contain mostly blue stars
Indicate whether the statement is true or false
Physics & Space Science
The color of a firework comes from the glowing of
A) molecules. B) atoms. C) gun powder. D) laser light.
Physics & Space Science