The speed an object needs to move away from the gravitational pull of Earth is called
A. orbital velocity.
B. random velocity.
C. rotational velocity.
D. escape velocity.
Answer: D
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Spherical Mirrors: A beam of light that is parallel to the principal axis strikes a convex mirror. What happens to the reflected beam of light?
A. It also is parallel to the principal axis. B. It is perpendicular to the principal axis. C. It appears to be coming from the focal point on the other side of the mirror. D. It appears to be coming from the center of curvature of the mirror. E. It appears to be coming from a point between the focal point and the center of curvature of the mirror.
What's the best explanation for jovian planets farther from the Sun having less mass?
What will be an ideal response?
After a skydiver reaches terminal velocity,
A. the force of gravity no longer performs work on the skydiver. B. work performed by the force of gravity is converted into gravitational potential energy. C. gravitational potential energy is no longer available to the system of the skydiver plus the Earth. D. gravitational potential energy is converted into thermal energy. E. thermal energy is converted into gravitational potential energy.
The ozone layer
a. reflects all EM waves. b. reflects high frequency radio waves. c. reflects low frequency radio waves. d. is responsible for the greenhouse effect. e. absorbs ultraviolet light in sunlight.