What element is found in all life on Earth?
a. hydrogen
b. iron
c. carbon
d. oxygen
e. nitrogen
c
Physics & Space Science
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What temperature is needed to fuse helium into carbon?
A) 5,800 K B) 100,000 K C) 15 million K D) 100 million K E) one billion K
Physics & Space Science
Twenty milliseconds is
a. 0.00002 s. b. 0.0002 s. c. 0.002 s. d. 0.02 s. e. 20000 s.
Physics & Space Science
Which of the following atoms normally has one covalent bond to it?
a. I b. O c. C d. P e. Kr
Physics & Space Science
A child on a merry-go-round is moving with speed 4 m/s in a circle with radius 2 m. If the child's mass is 30 kg, what is the centripetal force?
Physics & Space Science