A large _______________ makes it easier for a planet to hold onto orbiting ring particles
Fill in the blank(s) with correct word
mass
planet
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Which of the following explains why, about 13,000 years from now, Vega will be a better North Star than Polaris?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
A camera lens is initially set at f/8 for a shutter speed of 1/250 s. If the amount of lighting on the subject is unchanged, and the lens is set at f/4, what is the proper shutter speed at this setting?
a. 1/1000 s b. 1/500 s c. 1/250 s d. 1/2 s e. 1/8 s
Give some examples of simple harmonic motion:
a. Mass and spring b. pendulum c. light d. a and B
Radiative energy is
A) heat energy. B) energy from nuclear power plants. C) energy carried by light. D) energy of motion.