Which of the following is not a conserved quantity?
A) energy
B) momentum
C) angular momentum
D) radiation
D
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If the mass of the Earth decreased by a factor of two with no change in radius, your weight would
a. increase by a factor of 4. b. increase by a factor of 2. c. stay the same. d. decrease by a factor of 2. e. decrease by a factor of 4.
Infra-red radiation is produced by
A) mechanical oscillators that move air back and forth. B) molecules in thermal motion. C) nuclear vibrations. D) electric currents oscillating in human-made electronic devices. E) electrons orbiting around the nucleus in atoms.
Magnet A has twice the magnetic field strength of magnet B and pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is
A) about 50 N. B) exactly 100 N. C) more than 100 N. D) not enough information
About what percentage of molecules in the air make up the atmosphere below a 6-kilometer altitude?
A) 20% B) 30% C) 40% D) 50% E) more than 50%