A ball thrown vertically upward, at the top of its path (just before it starts to fall) has:
a. an instantaneous speed of zero.
b. the same instantaneous speed it had throughout its trajectory.
c. gone as low as it is going to go.
d. an instantaneous speed of 10 meters per second.
e. an acceleration of zero.
a
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The value of an object's acceleration may be characterized in equivalent words by which of the following?
a. displacement b. rate of change of displacement c. velocity d. rate of change of velocity
State Einstein's principle of equivalence
What will be an ideal response?
All the following statements about Mars are true. Which one might have led to a significant loss of atmospheric gas to space?
A) The axis tilt of Mars is thought to change significantly with time. B) Mars lost any global magnetic field that it may once have had. C) Outgassed water molecules are split apart, and the oxygen then reacts chemically with surface rock on Mars. D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.
An automobile with a mass of 2000 kg is moving north on a level, straight highway with a constant velocity of 80 km/h. What is the unbalanced force acting on the automobile?
Indicate whether the statement is true or false