The hydrogen absorption lines are the strongest in ________ type stars.
A. A
B. B
C. O
D. G
Answer: A
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Gravitational Potential Energy: A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height. The gravitational potential energy of the second stone compared to that of the first stone is
A. one-fourth as much. B. one-half as much. C. twice as much. D. four times as much. E. the same.
Why is the sky blue?
A) The atmosphere reflects the color of the oceans. B) The atmosphere reflects the light from the Sun. C) The atmosphere scatters the light from the Sun. D) The oceans refract the light from the Sun into the atmosphere. E) The oceans reflect the light from the Sun into the atmosphere.
A geosynchronous satellite is one that stays above the same point on the Earth, which is possible only if it is above one of the Earth's poles
Indicate whether the statement is true or false
A student has made the statement that the electric flux through one half of a Gaussian surface is always equal and opposite to the flux through the other half of the Gaussian surface. This is
A. never true. B. never false. C. true whenever enclosed charge is symmetrically located at a center point, or on a center line or centrally placed plane. D. true whenever no charge is enclosed within the Gaussian surface. E. true only when no charge is enclosed within the Gaussian surface.