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Gravity
Key Concepts:
Terms in this set (34)
Is there change in the force of gravity between two objects when their masses are doubled and the distance between them is also doubled?
The force of gravity is quadrupled.
The force of gravity is doubled.
The force of gravity is tripled.
There is no change.
There is no change.
A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater?
the force on A
the force on B
both forces on each other are the same
both forces on each other are the same
As a bowling ball that rolls off the edge of a table falls, its horizontal component of motion
increases.
decreases.
remains constant.
remains constant.
A rock is thrown upward at 50° with respect to the horizontal. As it rises, its vertical component of velocity
remains unchanged.
decreases.
increases.
decreases.
A hunter aims a rifle at an angle of 10° above the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. The bullet to hit the ground first is
the dropped one.
the fired one.
both hit at the same time
the dropped one.
A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 s later?
500 m
100 m
98 m
50 m
none of the above
100 m
If the volume of an object doubles with no change in mass, its density would be
half.
double.
unchanged.
half.
When a chocolate bar is cut in half, its density of each half is
unchanged.
doubled.
halved.
unchanged.
Which has the greater density, a lake full of water or a cupful of lake water?
the cupful of lake water
the lake
both have the same density
both have the same density
Which will remain the same for two identical books, one lying flat and the other standing on an end?
weight only
pressure only
both pressure and weight
none of the above
weight only
When you stand on tiptoes on a bathroom scale, there is an increase in
pressure on the scale, not registered as weight.
weight reading.
both weight and pressure on the scale.
none of the above
pressure on the scale, not registered as weight.
Water pressure at the bottom of a lake depends on the
surface area of the lake.
depth of the lake.
weight of water in the lake.
all of the above
depth of the lake.
In which case is the pressure you exert on the floor the greatest?
Standing on tiptoes on one foot
Standing on tiptoes
Lying flat
The pressure is the same for all these answers.
Standing on tiptoes on one foot
What common liquid covers more than two-thirds of our planet, makes up 60% of our bodies, and sustains our lives and lifestyles in countless ways?
blood
water
bromine
mercury
water
A completely submerged object always displaces its own
weight of fluid.
density of fluid.
volume of fluid.
all of the above
none of the above
volume of fluid.
A block of Styrofoam floats on water while a same-size lead block lies submerged in the water. The buoyant force is greatest on the
lead.
Styrofoam.
same for both
lead.
The buoyant force on a submerged boulder acts upward because _______.
water is denser at the bottom of the boulder
it is easier to lift when submerged
equal water pressures act on all sides
greater water pressure acts on the bottom than on the top
greater water pressure acts on the bottom than on the top
The buoyant force that acts on a 10-ton ship floating in the ocean is
greater than 10 tons.
less than 10 tons.
10 tons.
depends on the density of seawater
10 tons.
Buoyant force acts upward on a submerged object because
the weight of fluid displaced reacts with an upward force.
pressure against its bottom is greater than pressure against its top.
it acts in a direction to oppose gravity.
if it acted downward, nothing would float.
pressure against its bottom is greater than pressure against its top.
How much buoyant force acts on a 10-ton ship floating in a fresh-water lake?
less than 10 tons
more than 10 tons
10 tons
not enough information
10 tons
When an object is partly or wholly immersed in a liquid, it is buoyed up
and floats because of Archimedes' principle.
by a force equal to its own weight.
but sinks.
by a force equal to the weight of liquid displaced.
none of the above
by a force equal to the weight of liquid displaced.
The product of gas pressure and volume for a given mass of gas is constant
never.
whether or not the temperature changes.
if the temperature doesn't change.
none of the above
if the temperature doesn't change.
When a gas in a container is squeezed to half its volume at constant temperature, the gas pressure
doubles.
quadruples.
is half.
remains the same.
doubles.
How deep must an inverted drinking glass be pushed beneath the surface of water so that the volume of enclosed air is squeezed to half?
29.4 m
10.3 m
76 cm
14.7 m
20.6 m
...
Atmospheric pressure is caused by the
weight of the atmosphere.
effect of the Sun's energy on the atmosphere.
temperature of the atmosphere.
density of the atmosphere.
weight of the atmosphere.
Compared with a mercury barometer, the column height for a water barometer would be
higher.
lower.
the same.
higher.
Consider two vertical tubes of equal cross-section area, one containing water and the other mercury. If the liquid pressures at the bottom of the tubes are equal, both liquids would have equal
volumes.
densities.
weights.
number of molecules.
none of the above
weights.
A change in pressure at any point in a confined fluid at rest is transmitted
to points of lower pressure.
in the direction of lower energies.
undiminished to all points in the fluid.
all of the above
none of the above
undiminished to all points in the fluid.
A hydraulic device has two pistons, one with a small cross-section area and another piston with a larger cross-section area. If a given force is applied to the small piston, the output force on the larger-area piston will be
less.
greater.
the same.
all of the above
none of the above
greater.
If a pressure of 20 kPa is applied to one piston in a simple hydraulic device, the pressure on a piston of larger area will be
more than 20 kPa.
less than 20 kPa.
the same 20 kPa.
all of the above
none of the above
the same 20 kPa.
As a helium-filled balloon rises in the air, it becomes
more dense.
heavier.
bigger.
all of the above
none of the above
bigger
A common 5-L metal can will float in air if it is
evacuated of air.
Nonsense! Unless the can and displaced air weigh the same, the can can't float in air.
thrown high enough into the air.
filled with a very large amount of helium.
Nonsense! Unless the can and displaced air weigh the same, the can can't float in air.
Airplane lift is achieved when air pressure on the bottom of its wings is
greater than pressure on top.
the same as pressure on top.
less than pressure on top.
greater than pressure on top.
If air speed is greater along the top surface of a bird's wings, pressure of the moving air there is
more.
unaffected.
less.
turbulent.
less
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