The following statements refer to man-made, artificial satellites in orbit around Earth. Which is an accurate statement?
A) The velocity required to keep a satellite in a given orbit depends on the mass of the satellite.
B) The period of revolution of a satellite moving about the Earth is independent of the size of the orbit it travels.
C) A satellite in a large diameter circular orbit will always have a longer period of revolution about the Earth than will a satellite in a smaller circular orbit.
D) It is possible to have a satellite traveling at either a high speed or at a low speed in a given circular orbit.
E) Only circular orbits are possible for artificial satellites.
C
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Sun is considered to be a
A) low-mass star. B) intermediate-mass star. C) high-mass star. D) brown dwarf.
A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill with no air resistance. Which object rises to a greater height?
A) The heavy object, because it has greater initial kinetic energy. B) The light object, because gravity slows it down less. C) The lightweight object, because the force of gravity on it is less. D) The heavy object, because it has more mass to carry it up the hill. E) They both slide to exactly the same height.
The type of adhesive that cures by the exclusion of oxygen is called ___________.
Fill in the blank(s) with the appropriate word(s).
The crust of Mars is believed to ____ than Earth's
a. be much thinner b. be younger c. contain more water d. be more geologically active e. be much stronger