The angular momentum of a system remains constant
A) when the total kinetic energy is constant.
B) when no net external force acts on the system.
C) when the linear momentum and the energy are constant.
D) when no torque acts on the system.
E) all the time since it is a conserved quantity.
Answer: D
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An electron is traveling due south when it enters a uniform magnetic field directed due west. Which of the following statements concerning this situation is false?
a) The subsequent motion of the electron will be the same as if there were an electric field directed due west and no magnetic field present. b) The electron will follow a curved path. c) The direction of the magnetic force on the electron will vary with time. d) The magnitude of the magnetic force will be constant with time. e) The direction of the magnetic field and the direction of the magnetic force on the electron are perpendicular to one another.
Light is refracted through a diamond. If the angle of incidence is 30°, and the angle of refraction is 12°, what is the index of refraction?
a. 1.3 b. 2.4 c. 2.6 d. 1.8 e. 0.4
The average star spends ________ of its lifetime on the main sequence
a. 1% b. 2% c. 10% d. 20% e. 90%
Cosmological redshift is the result of
A) the high speeds at which galaxies move within clusters. B) the expansion of the universe. C) very old, red stars in distant galaxies. D) supermassive black holes.