Why are smaller terrestrial bodies such as Mercury or the Moon “geologically dead”?
a. They cooled off faster than Earth did.
b. They don’t have erosion.
c. They were hit by fewer meteorites than Earth.
d. They are made of different materials than Earth.
Answer : a. They cooled off faster than Earth did.
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Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge. b. Z has a negative charge. c. Y has a positive charge. d. Z is neutral (has no net charge.) e. Y is negatively charged or neutral (has no net charge.)
As a 4-10 solar mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity
A) decreases. B) first decreases, then increases. C) increases. D) remains roughly constant. E) first increases, then decreases.
A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car
A) The force of collision on the truck is greater then the force of collision on the car. B) The force of collision on the truck is equal to the force of collision on the car. C) The force of collision on the truck is smaller than the of collision force on the car. D) The truck did not slow down during the collision. E) The car did not slow down during the collision.
The moons of Mars are ______________; that is, they always keep the same face toward the planet
Fill in the blank(s) with correct word