The ocean originated from ____
A) water vapor produced by cellular respiration in early living organisms
B) radioactive heating of Earth's interior, and the heating of the surface by meteorites striking and melting the outer layers of Earth
C) capture of water molecules in space by Earth's gravity
D) volcanic gases, radioactive heating of Earth's interior, and a barrage of icy comets or asteroids striking and melting the outer layers of Earth
D
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Gilbert is attracted toward Earth by a 500-N gravitational force. The Earth is attracted toward Gilbert with a force of
A. 1000 N. B. zero. C. 500 N. D. 250 N.
A 10-N block and a 1-N block lie on a horizontal frictionless table. To push them with equal acceleration, we would have to push with
A) equal forces on each block. B) 10 times as much force on the heavier block. C) 10 squared or 100 times as much force on the heavier block. D) one-tenth as much force on the heavier block. E) none of the above
Nuclear fission is the process of
A) bringing light atoms together to make heavier atoms B) splitting of heavy atoms to make light atoms C) using solar energy to excite atomic nuclei D) producing nuclear fuel
The structure of tumor necrosis factor includes which of the following?
A) four helical segments B) only b-pleated sheet C) both a-helix and b-pleated sheet D) four cysteine residues which form two disulfide bridges