FINAL: CH5 Flashcards
If a loaf of bread is compressed, its A.) molecules decrease in size B.) density decreases C.) density increases D.) none of the above
C.) density increases
When a chocolate bar is cut in half, its density is A.) halved B.) unchanged C.) doubled D.) none of the above
B.) unchanged
Compared to a bar of pure gold, the density of a pure gold ring is A.) less B.) the same C.) more D.) none of the above
B.) the same
If the mass of an object were to double with no change in mass, its density would
A.) be half
B.) double
C.) unchanged
B.) double
If the volume of an object were to double with no change in mass, its density would
A.) be half
B.) double
C.) unchanged
A.) be half
When you stand on tiptoes on a bathroom scale, there is an increase in
A.) weight reading
B.) pressure on the scale, not registered as weight
C.) both weight and pressure on the scale
D.) none of the above
E.) all of the above
B.) pressure on the scale, not registered as weight
Water pressure at the bottom of a lake depends on the A.) weight of water in the lake B.) surface area of the lake C.) depth of the lake D.) all of the above
C.) depth of the lake
The pressure in a liquid depends on liquid A.) density B.) depth C.) both D.) neither
C.) both
Consider two tubes filled with water at the same height, one with fresh water and the other tube with salt water. The pressure is greater at the bottom of the tube with
A.) fresh water
B.) salt water
C.) both the same
D.) depends on whether the tubes have the same cross-sectional area
E.
B.) salt water
Water pressure is greatest against the A.) top of a submerged object B.) bottom of a submerged object C.) sides of a submerged object D.) same against all sides E.) none of the above
B.) bottom of a submerged object
A dam is thicker at the bottom than at the top because
A.) water is denser at deeper levels
B.) water pressure is greater at deeper levels
C.) water is cooler at deeper levels
D.) dams look better
E.) none of the above
B.) water pressure is greater at deeper levels
The pressure at the bottom of a jug filled with water does NOT depend on A.) the acceleration due to gravity B.) water density C.) the height of the liquid D.) surface area of the water E.) none of the above
D.) surface area of the water.
Pumice is a volcanic rock that floats. Compared with the density of water, its density is A.) less B.) the same C.) more D.) none of the above
A.) less
A completely submerged solid object always displaces its own A.) volume of fluid B.) weight of fluid C.) density of fluid D.) all of the above E.) none of the above
A.) volume of fluid
A fish staying motionless in water displaces its own A.) volume of water B.) weight of water C.) both D.) neither
C.) both
Buoyant force acts upward on a submerged object because
A.) upward pressure on bottom is greater than downward pressure on top of the object
B.) it acts in a direction to oppose gravity
C.) if it acted downward, nothing would float
D.) the weight of fluid displaced reacts with an upward force
E.
A.) upward pressure on bottom is greater than downward pressure on top of the object
What is the buoyant force acting on a 10-ton ship floating in the ocean? A.) less than 10 tons B.) 10 tons C.) more than 10 tons D.) depends on the density of seawater
B.) 10 tons.
because it’s floating!
What is the buoyant force acting on a 10-ton ship floating in a fresh water lake? A.) less than 10 tons B.) 10 tons C.) more than 10 tons D.) not enough information
B.) 10 tons.
because its floating!
What is the weight of water displaced by a 100-ton floating ship? A.) less than 100 tons B.) 100 tons C.) more than 100 tons D.) depends on the ships shape
B.) 100 tons
because its floating!
When an object is partly or wholly immersed in a liquid, it is buoyed up
A.) by a force equal to its own weight
B.) by a force equal to the weight of liquid displaced
C.) and floats because of Archimedes principle
D.) but sinks
E.) none of the above
B.) by a force equal to the weight of liquid displaced.
The reason a life jacket helps you float is that
A.) the jacket causes you to weigh less
B.) the jacket has the same density as an average human
C.) the jacket repels water
D.) if you sink, the jacket sinks
E.) the combined density of you and the jacket is less than average density of water.
E.) the combined density of you and the jacket is less than average density of water.
A lobster crawls onto a bathroom scale submerged on the ocean bottom. Compared to its weight above the surface, its apparent weight under water is
A.) greater
B.) less
C.) the same
B.) less
Two life preservers have identical volumes, one filled with Styrofoam and the other filled with sand. When both life preservers are fully submerged, the buoyant force is greater on the one filled with
A.) styrofoam
B.) sand
C.) same on each if volumes remain the same
C.) same on each if volumes remain the same
An egg is placed at the bottom of a bowl filled with water. Salt is slowly added to the water until the egg rises and floats. From this experiment, we conclude that
A.) egg shell calcium is repelled by sodium chloride
B.) the density of salt water exceeds the density of the egg
C.) buoyant force does not always act upward
D.) salt sinks to the bottom
E.) none of the above
B.) the density of salt water exceeds the density of the egg
