Which of the following quantities is conserved for a planet orbiting a star in a circular orbit? Only the planet itself is to be taken as the system; the star is not included.
A. Momentum and energy.
B. Energy and angular momentum.
C. Momentum and angular momentum.
D. Momentum, angular momentum and energy.
E. None of the above.
Answer: B
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A particle (charge = +2.0 mC) moving in a region where only electric forces act on it has a kinetic energy of 5.0 J at point A. The particle subsequently passes through point B which has an electric potential of +1.5 kV relative to point A. Determine the kinetic energy of the particle as it moves through point B
a. 3.0 J b. 2.0 J c. 5.0 J d. 8.0 J e. 10.0 J
An AM station is broadcasting at 980 kHz, while an FM station up the road is assigned 98 MHz. How do their carrier waves compare?
What will be an ideal response?
Where would you find Van Allen belts of radiation?
a. Within Earth's core b. Within Earth's ozone layer c. Within Earth's magnetosphere d. Within Earth's mantle e. Within Earth's subduction zones
The energy of a photon
a. is proportional to the wavelength of the light. b. is inversely proportional to the wavelength of the light. c. depends only on the speed of the light. d. depends only on the mass of the photon. e. depends on both the mass and speed of the photon.