Question 1

You are camping in the breathtaking mountains if Colorado. You spy an unopened diet soda can floating motionless below the surface of a lake. What is the direction and amount of force the water exerts on it?
A) Zero
B) Down, equal to the can's weight
C) Up, equal to the can's weight
D) Not enough information is given

Accepted Answer

The water exerts an upward buoyant force on the can, equal to the weight of the water displaced by the can. This is why the can floats below the surface rather than sinking or rising, indicating equilibrium between the can's weight and the buoyant force.

Question 2

Lead sinkers actually float on the surface of liquid mercury. Which takes up more space: 1 kg of mercury or 1 kg of lead?
A) Mercury
B) Lead
C) Neither take up any space
D) Not enough information is given

Accepted Answer

The answer of Lead sinkers actually float on the surface...

Question 3

A popular drink is composed by pouring several types of beverage (one on top of the other) in order to get a layering effect. In what order should the individual beverages be poured into the glass so that your drink is stable?
A) Least dense first and then in order of increasing density.
B) Most dense first and then in order of decreasing density.
C) Most dense on the top and bottom to hold the least dense fluids in the middle.
D) Not enough information is given

Accepted Answer

To achieve a stable layering effect in a drink, you should pour the most dense beverage first and then continue in order of decreasing density. This method ensures that the heavier liquids stay at the bottom and the lighter ones on top, preventing them from mixing easily.

Question 4

Water weighs about 10 N per liter. A 4.0 liter ball is pushed underwater. What is the buoyant force on the ball?
A) 4.0 liters
B) 10 N
C) 20 N
D) 40 N

Accepted Answer

The buoyant force on an object submerged in water is equal to the weight of the water displaced by the object. Since water weighs about 10 N per liter and the ball displaces 4.0 liters of water, the buoyant force is 4.0 liters x 10 N/liter = 40 N.

Question 5

Water weighs about 10 N per liter. A 4.0 kg ball floats on the water's surface. What is the weight of the water being displaced by the ball?
A) Much less than 2000 N
B) Much more than 40 N
C) About 40 N
D) Not enough information is given

Accepted Answer

The weight of the water displaced by the ball is equal to the weight of the ball itself due to the principle of buoyancy. Since the ball weighs 4.0 kg and the acceleration due to gravity is approximately 9.8 m/s^2, its weight is 4.0 kg * 9.8 m/s^2 = 39.2 N, which is about 40 N.

Question 6

Why will a rolled - up ball of aluminum foil float in water but solid aluminum will float?
A) It won't - the ball will sink.
B) Due to the air inside, the average density of the ball is lower than water.
C) Aluminum is less dense than water anyway.
D) Water cannot get in to equalize the pressure.

Accepted Answer

The rolled-up ball of aluminum foil floats because the air trapped inside lowers its average density compared to water, allowing it to float. Solid aluminum, being denser than water, would sink.

Question 7

One warm spring day you and some friends go to the beach at a nearby lake. You are tossing a soft, almost fully inflated beach ball around when someone accidentally knocks it into the lake. Although it is a warm day, the water is still very cold so nobody wants to retrieve the ball. You notice that the ball seems to have deflated somewhat after sitting in the water for a while. The contact with the cool water has caused the temperature of the air inside the ball to drop, resulting in
A) a decrease in the pressure inside the ball.
B) an increase in the density of the air inside the ball.
C) a decrease in the density of the air inside the ball.
D) an increase in the pressure inside the ball.

Accepted Answer

The answer of One warm spring day you and some...

Question 8

You are trying to deliver water to a sink in the tree house in your backyard. You run an old hose from the spigot behind your home, across your yard, and up the tree to a sink inside the tree house. You let water fill the hose all the way to the tree house sink and then leave the hose pressurized overnight, with no water flowing in it. Unfortunately, the hose cannot tolerate high pressure anymore and it springs a leak around midnight. By morning your whole backyard is a swamp. The most likely site for the leak is
A) on the way up the tree-the most vertical portion of the hose.
B) on the ground-the lowest point on the hose.
C) at the spigot-the first point on the hose.
D) at the sink-the highest point on the hose.

Accepted Answer

The most likely site for the leak is on the ground, the lowest point on the hose, because water pressure is highest at the lowest points due to gravity. This increased pressure can cause weak spots in the hose to fail first.

Question 9

The brake system in most cars makes use of a hydraulic system. This system consists of a fluid filled tube connected at each end to a piston. Assume that the piston attached to the brake pedal has a cross sectional area of one half a square inch and the piston attached to the brake pad has a cross section area of two square inches. When you apply a force of 10 pounds to the piston attached to the brake pedal, the force at the brake pad will be,
A) 5 pounds.
B) 10 pounds.
C) 20 pounds.
D) 40 pounds.

Accepted Answer

The hydraulic system follows Pascal's principle, which states that pressure applied to a confined fluid is transmitted undiminished throughout the fluid. The force is multiplied by the ratio of the areas of the pistons. The area of the brake pad piston is four times that of the brake pedal piston (2 square inches / 0.5 square inches = 4). Therefore, the force is multiplied by 4, resulting in a force of 40 pounds at the brake pad.

Question 10

The Coelocanth is a very interesting, quite primitive fish that live deep in the ocean. Watching these beautiful creatures on a nature documentary, you notice that they are able to stay basically at one position in the water with only slight movements of its lobed fins. This indicates that
A) you don't have to be athletic to get on a documentary.
B) the density of the fish is less than the density of the water.
C) the density of the fish is greater than the density of the water.
D) the density of the fish is about equal to the density of the water.

Accepted Answer

The ability of the Coelacanth to maintain its position in the water with minimal movement suggests that its density is roughly equal to that of the water, allowing it to achieve neutral buoyancy.

Question 11

A block of hardwood is floating easily on the surface of a lake. As a storm approaches, the density and pressure of the air above the lake begin to decrease. As a result of this decrease in air pressure and density, the block of wood
A) moves upward slightly and floats higher in the water.
B) continues to float just as it did before.
C) moves downward slightly and floats lower in the water.
D) sinks to the bottom of the lake.

Accepted Answer

The answer of A block of hardwood is floating easily...

Question 12

As we have studied, columns of water and those of air are fundamentally important in earth science. Using three similarities and three differences please compare and contrast columns of water and columns of air.

Accepted Answer

The answer of As we have studied, columns of water...

Question 13

For an object that is floating on a fluid,
A) The weight of fluid displaced is less than its weight.
B) The weight of the fluid displaced is greater than the object's weight.
C) The weight of the fluid displaced equals the object's weight.
D The weight of the object becomes less than in air.

Accepted Answer

The principle of buoyancy, also known as Archimedes' principle, states that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid that the object displaces. For an object to float, the weight of the fluid displaced must equal the object's weight.

Question 14

For an object that sinks in a fluid,
A) The weight of fluid displaced is less than its weight.
B) The weight of the fluid displaced is greater than the object's weight.
C) The weight of the fluid displaced equals the object's weight.
D) The weight of the object becomes more than in air.

Accepted Answer

For an object that sinks in a fluid, the weight of the fluid displaced is less than the object's weight. This is because the buoyant force (equal to the weight of the fluid displaced) is not enough to counteract the object's weight, causing it to sink.

Question 15

For an object that is neutrally buoyant in a fluid,
A) The weight of fluid displaced is less than its weight.
B) The weight of the fluid displaced is greater than the object's weight.
C) The weight of the fluid displaced equals the object's weight.
D) The object has zero weight.

Accepted Answer

For an object to be neutrally buoyant in a fluid, the weight of the fluid displaced by the object must equal the object's weight, according to Archimedes' principle. This balance allows the object to float without sinking or rising.

Question 16

Suppose you have an aquarium and you notice that you have a solid plastic decoration and a rock of about the same mass but the decoration is twice as large as the rock. Both are totally submerged in the water. The buoyant force on the plastic object is about ___________as that on the rock.
A) twice as big.
B) the same.
C) half as big.
D) one quarter as big.

Accepted Answer

The buoyant force depends on the volume of the displaced fluid. Since the plastic decoration is twice as large in volume as the rock, it displaces twice as much water, resulting in a buoyant force that is twice as big.

Question 17

Water weighs about 10 N per liter on Earth. A 4.0 liter ball is pushed underwater on the space shuttle, where gravity was 1/10 that on Earth. What is the buoyant force on the ball?
A) 1N
B) 10 N
C) 4 N
D) 40 N

Accepted Answer

The answer of Water weighs about 10 N per liter...

Question 18

For your high school science project you are able to get community support and terraform Mars, so that liquid water could exist on its surface. Suppose you have two cans of soda - one barely floats and one barely sinks in fresh water on Earth. Taking them to Mars, with the gravitational acceleration being 1/3 its value on earth,
A) Both objects will now float because they are lighter.
B) The buoyant behavior of the two objects will be the same.
C) Both objects will sink because the water is lighter.
D) We can't say anything until we know if the water on Mars is freshwater or not.

Accepted Answer

The answer of For your high school science project you...

Question 19

Suppose you are ill and have to go to the hospital for shot. When the nurse points the fluid - filled syringe skyward to clear the air out of it, he presses the plunger down but no fluid comes out because the needle is plugged. When the plunger is pressed down and no fluid is moving,
A) The pressure of the fluid in the needed is much less than in the larger syringe.
B) The pressure of the fluid in the needle is much more than in the larger syringe.
C) The pressure of the fluid in the needle and much larger syringe are the same.
D) The pressure of the fluid everywhere is zero.

Accepted Answer

The pressure of the fluid in the needle and the larger syringe are the same because pressure is transmitted equally throughout a fluid in a closed system, according to Pascal's principle.

Question 20

You and your family are on a trip to the local museum and you notice that in the aquarium there are four fish: fish 1 is floating, fish 2 is stationary 2m below the water's surface, fish 3 is stationary 4 m below the water's surface and fish 5 is on the sand at bottom of the tank. (Note: things don't look good for fish 1 and fish 4 but that's beside the3 point here) Your Mom says that she'll buy you lunch if you rank the densities of the fish in order of increasing density, including the density of water in your ranking. Please select your ranking below.
A) 1<water<2<3<4
B) 1<2=3=water<4
C) 4<3<2<water<1
D) 4<3=2=water<1

Accepted Answer

Fish 1 is floating, indicating it is less dense than water. Fish 2 and 3 are stationary at different depths, indicating they have the same density as water. Fish 4 is on the bottom, indicating it is denser than water.

Quiz 5: Fluids

You are camping in the breathtaking mountains if Colorado. You spy an unopened diet soda can floating motionless below the surface of a lake. What is the direction and amount of force the water exerts on it?

Lead sinkers actually float on the surface of liquid mercury. Which takes up more space: 1 kg of mercury or 1 kg of lead?

A popular drink is composed by pouring several types of beverage (one on top of the other) in order to get a layering effect. In what order should the individual beverages be poured into the glass so that your drink is stable?

Water weighs about 10 N per liter. A 4.0 liter ball is pushed underwater. What is the buoyant force on the ball?

Water weighs about 10 N per liter. A 4.0 kg ball floats on the water's surface. What is the weight of the water being displaced by the ball?

Why will a rolled - up ball of aluminum foil float in water but solid aluminum will float?

The Coelocanth is a very interesting, quite primitive fish that live deep in the ocean. Watching these beautiful creatures on a nature documentary, you notice that they are able to stay basically at one position in the water with only slight movements of its lobed fins. This indicates that

A block of hardwood is floating easily on the surface of a lake. As a storm approaches, the density and pressure of the air above the lake begin to decrease. As a result of this decrease in air pressure and density, the block of wood

As we have studied, columns of water and those of air are fundamentally important in earth science. Using three similarities and three differences please compare and contrast columns of water and columns of air.

For an object that is floating on a fluid,

For an object that sinks in a fluid,

For an object that is neutrally buoyant in a fluid,

Suppose you have an aquarium and you notice that you have a solid plastic decoration and a rock of about the same mass but the decoration is twice as large as the rock. Both are totally submerged in the water. The buoyant force on the plastic object is about ___________as that on the rock.

Water weighs about 10 N per liter on Earth. A 4.0 liter ball is pushed underwater on the space shuttle, where gravity was 1/10 that on Earth. What is the buoyant force on the ball?

Suppose you are ill and have to go to the hospital for shot. When the nurse points the fluid - filled syringe skyward to clear the air out of it, he presses the plunger down but no fluid comes out because the needle is plugged. When the plunger is pressed down and no fluid is moving,