If the momentum of the person is P, the momentum of the skateboard in the situation shown in the figure is:
a. P.
b. –P.
c. zero.
d. 2P.
e. -2P.
b
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An electron traveling toward the magnetic north with speed 400 km/s enters a region where the earth's magnetic field has the magnitude 5.0 × 10-5 T and is directed downward at 45° below horizontal
What magnitude magnetic force acts on the electron? (e = 1.60 × 10-19 C)
Which one of the following does not contribute to the problem of greenhouse-effect heating of the atmosphere?
A) automobile engines B) wood stoves C) nuclear power plants D) coal-burning power plants E) Actually, all of the above contribute to the problem.
A telescope design that uses a lens and no mirrors is a refractor
Indicate whether the statement is true or false
The Michelson interferometer is a device that may be used to measure:
a. magnifying power of lenses. c. atomic masses. b. light wavelength. d. electron charge.