Conceptual Physics - Chapter 13

If a 1-L container is immersed halfway into water, what is the volume of water displaced? What is the buoyant force on the container? 1 L displaced, 1 N buoyant force 1 L displaced, 10 N buoyant force 0.5 L displaced, 5 N buoyant force 0.5 L displaced, 10 N buoyant force

0.5 L displaced, 5 N buoyant force

What is the buoyant force acting on a 10-ton ship floating in the ocean? less than 10 tons 10 tons more than 10 tons depends on density of sea water

10 tons

If an object submerged in water displaces 10 kg of water, the buoyant force on the submerged object is __________. 10 kg more than 100 N 10 N 100 N

100 N

How is the density of a fish controlled? How is the density of a submarine controlled? A fish changes its volume, and a submarine changes its volume, too. A fish changes its weight, whereas a submarine changes its mass. A fish changes its weight, whereas a submarine changes its volume. A fish changes its volume, whereas a submarine changes its weight.

A fish changes its volume, whereas a submarine changes its weight.

Distinguish between adhesive and cohesive forces. Adhesive forces are attractive, whereas cohesive forces are repulsive. Adhesive forces are always stronger than cohesive forces. Adhesive forces are between unlike substances, whereas cohesive forces are between like substances. Adhesive forces are between like substances, whereas cohesive forces are between unlike substances.

Adhesive forces are between unlike substances, whereas cohesive forces are between like substances.

Why is there no horizontal buoyant force on a submerged object? Force vectors on the sides cancel one another. Forces on the sides are zero at every point. Forces on the top and bottom add and cancel gravity. Force vectors on the top and bottom cancel one another.

Force vectors on the sides cancel one another.

On a boat ride, the skipper gives you a life preserver filled with lead pellets. When he sees the skeptical look on your face, he says that you'll experience a greater buoyant force if you fall overboard than your friends who wear Styrofoam-filled preservers. He is correct about the buoyancy and you have nothing to fear. He is correct about the buoyancy, but you will nevertheless sink. He is incorrect about the buoyancy, but you will float anyway. He is completely incorrect.

He is correct about the buoyancy, but you will nevertheless sink.

A scuba diver is planning to dive to the same depth in the open ocean and in a deep lake. Considering that salt water is denser that fresh water, where would the diver feel more pressure? Same in both In the ocean In the lake We need to know the depth of the diver to answer this question.

In the ocean

If you punch holes in the side of a container filled with water, in what direction does the water initially flow outward from the container? It comes out 45 degrees below horizontal. It drops straight down. The bottom one comes straight out, whereas the upper ones come out at a downward angle. It flows straight out, perpendicular to the wall.

It flows straight out, perpendicular to the wall.

A loaded ship arrives at the first freshwater lock of the Panama Canal, will it float higher or lower than in the open ocean? I need to know the weight of the ship to answer. It will float lower. It will float at the same level. It will float higher.

It will float lower.

When Dr. Hewitt immerses the object in water, how does the loss of weight of the object compare with the buoyant force of the water? Loss of weight is equal to the buoyant force. Loss of weight is greater than the buoyant force. Loss of weight is less than the buoyant force.

Loss of weight is equal to the buoyant force.

Fill in the blanks: An object denser than water will _______ in water. An object less dense than water will _______ in water. An object with the same density as water will _______ in water. Sink, float, sink Float, sink, float Sink, float, neither sink nor float Float, sink, neither sink nor float

Sink, float, neither sink nor float

What geometrical shape has the least surface area for a given volume? Cube Sphere Disk Cylinder

Sphere

Why do the gondolas of the Falkirk Wheel (see Figure 13.19 in the textbook) have the same weight whether or not they carry boats? The boats displace their volume of water. The boats displace water out of the gondolas equal to their weights. Water is pumped into the gondolas until the weight is correct. The boats displace their volume of air.

The boats displace water out of the gondolas equal to their weights.

What is the buoyant force that acts on a submerged object equal to? The buoyant force is equal to the weight of the object submerged. The buoyant force is equal to both the weight of the fluid displaced and the weight of the object. The buoyant force is equal to the weight of the fluid displaced by the submerged object.

The buoyant force is equal to the weight of the fluid displaced by the submerged object.

The large piston of a hydraulic lift has an area twice the area of the small piston. In comparison to a force applied on the small piston, what would the force exerted by the large piston be? The large piston would have the same force. The large piston would have double the force. The large piston would have half the force. The large piston would have a larger force.

The large piston would have double the force.

There is a condition in which the buoyant force on an object does equal the weight of the object. What is this condition? The object is neutrally buoyant, so it will neither sink nor float. It will float almost completely out of the water. It will sink. It will float.

The object is neutrally buoyant, so it will neither sink nor float.

What happens to the pressure in all parts of a confined fluid if the pressure in one part is increased? The pressure everywhere increases by different amounts depending on the area of each part. The pressure everywhere decreases to conserve total pressure. The pressure everywhere increases by the same amount. The pressure in the other parts remains the same.

The pressure everywhere increases by the same amount.

Why does the buoyant force act upward on an object submerged in water? The pressure upward on the top is greater than the downward pressure on the deeper bottom. The pressure downward on the deeper bottom is less than the upward pressure on the top. Water shields the object from gravity. The pressure upward on the deeper bottom is greater than the downward pressure on the top.

The pressure upward on the deeper bottom is greater than the downward pressure on the top.

If you swim beneath the surface in saltwater, will the pressure be greater than in freshwater at the same depth? Why or why not? The pressure will be greater because saltwater is less dense. The pressure will be the same because it only depends on the depth. The pressure will be less because saltwater is more dense. The pressure will be greater because saltwater is more dense. The pressure will be less because saltwater is less dense.

The pressure will be greater because saltwater is more dense.

How does water pressure 2 m below the surface of a small pond compare with water pressure 2 m below the surface of a huge lake? The pressure will be zero in both cases. The pressure will be the same. The pressure will be less. The pressure will be greater.

The pressure will be the same.

When Dr. Hewitt immerses an object in water the second time and catches the water that is displaced by the object, how does the weight lost by the object compare to the weight of the water displaced? The weight loss of the object is less than the weight of the water displaced. The weight loss of the object is greater than the weight of the water displaced. The weight loss of the object is equal to the weight of the water displaced.

The weight loss of the object is equal to the weight of the water displaced.

Water pressure is greatest against the top of a submerged object. bottom of a submerged object. sides of a submerged object. is the same against all surfaces. none of these.

bottom of a submerged object.

The operation of a hydraulic press best illustrates __________. Archimedes' principle streamline flow of fluids conservation of energy differences in pressure

conservation of energy

The pressure increases on a block resting on a table when you increase the __________. density of the block downward force on the block surface area downward force and surface area

downward force on the block

Water pressure in a lake is ____________. greater at the bottom the same at any point greater at the surface greater midway to the bottom

greater at the bottom

Water pressure provided by a water tower is greater if the tower is taller. holds more water. Both A and B. None of the above.

is taller.

Surface tension is caused by __________. the interaction between air and a water surface water's tendency to remain wet temperature variations in liquids molecular attractions

molecular attractions

When You Stand on Tiptoes on a Bathroom Scale, There Is an Increase In weight reading. pressure on the scale. both weight and pressure on the scale. None of these.

pressure on the scale.

Consider Two Tubes Filled With Water at the Same Height, One With Freshwater and the Other With Saltwater. The Pressure Is Greater at the Bottom of the Tube With freshwater. saltwater. Both the same. Depends on whether the tubes have the same cross-sectional area.

saltwater.

Two life preservers have identical volumes, but one is filled with styrofoam while the other is filled with sand. When the two life preservers are fully submerged, the buoyant force is greater on the one filled with styrofoam. sand. same on each

same on each

A stone of volume V submerged in water displaces the _________. same density times volume same weight of water same volume of water same volume and weight of water

same volume of water

The pressure at the bottom of a jug filled with water does NOT depend on water density. the height of the liquid. none of the given variants the acceleration due to gravity. surface area of the water

surface area of the water

The caissons of the Falkirk Wheel are balanced only when __________. their water levels are the same the same number of boats are in each they carry boats of equal weights boats are not heavily loaded

their water levels are the same

The reason that buoyant force acts upward on a submerged object is that it acts in a direction to oppose gravity. if it acted downward, nothing would float. the weight of fluid displaced reacts with anupward force. upward pressure against the bottom is greater than downward pressure against the top of the submerged object.

upward pressure against the bottom is greater than downward pressure against the top of the submerged object.

A dam is thicker at the bottom than at the top partly because water is denser at deeper levels. water pressure is greater with increasing depth. surface tension exists only on the surface of liquids. it looks better. none of these.

water pressure is greater with increasing depth.