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

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

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