What is the source of the energy for the creation of heavy elements [heavier than iron]?
A) The shock of a supernova explosion.
B) Fission.
C) Helium fusion.
D) Gravitational collapse.
E) Hydrogen fusion.
A
Physics & Space Science
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Brownian motion is caused by
A) thermal agitation. B) perpetual motion. C) particles larger than atoms bumping into them. D) interactions between atoms and molecules. E) almost invisible bugs.
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When steam condenses, the H2O
1) releases energy. 2) absorbs energy. 3) neither of these. When water freezes, the H2O 4) releases energy. 5) absorbs energy. 6) neither of these.
Physics & Space Science
To the nearest percent, what fraction of an iceberg is submerged? (rice = 917 kg/m3, rsea = 1.03 × 10^3 kg/m3.)
a. 95% b. 93% c. 91% d. 89% e. 77%
Physics & Space Science
A 3,000 kg truck experiences a net force of 2,000 N. What is its acceleration?
Physics & Space Science