70) If the
mass of the earth increased, with no change in radius, what would happen
to your weight?
change proportionally to the increase in mass
71) What causes a lunar
eclipse? Explain completely.
Earth casts its shadow on the moon
72) The value of the
acceleration due to gravity, g, is dependent upon what variables?
g= F/m = GM/R^{2 }
, depends on mass and distance
73) What causes a solar
eclipse? Explain completely.
Moon gets
between observer on earth and the sun
74) When a star collapses to
form a black hole, what happens to its mass?
unchanged
75) What is the
gravitational field strength at the center of the Earth?
net
strength is zero
76) Are tides more likely to
occur on a large planet or a small planet? Why?
large,
greater differential gravitational pull
77) According to Newton’s
laws, a rock and a pebble will fall with the same acceleration in a
gravitational field even though the gravitational force on each is
different. Explain why this is possible.
acceleration is always the same.
78) If you were to weigh
yourself in an elevator that is accelerating upward, would your weight be
greater or less than normal? Explain why.
as long as
it is accelerating, you would weigh more on the scale
79) Gravitation weakens as
the inverse square of distance, while tidal gravity (force per kilogram)
weakens with the inverse
cube or third
power
