Buoyancy

An object in a fluid is buoyed up by a force ______ the weight of the fluid displaced

1 pts

volume_mute

greater than

equal to

less than

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Explanation

What is the buoyant force exerted on a cubic foot of steel by the water?

1 pts

volume_mute

Suppose a cubic foot of steel (weight: 480 lb) is below the surface of water.

What is the buoyant force exerted on it by the water?

480 lb

62.4 lb

417.6 lb

0 lb

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Explanation

how much force would you have to exert to lift the steel under water?

1 pts

volume_mute

Suppose a cubic foot of steel (weight: 480 lb) is below the surface of water.

What will be the apparent approximate weight of the steel?

In other words, how much approximate force would you have to exert to lift the steel under waater?

62.4 lb

480 lb

418 lb

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Correct Answer

Explanation

Calculate how much of a wood volume will remain under water when it floats

1 pts

A cubic foot of pine wood weighs about 30 pounds. If it were pushed underwater, the byoyant force on it would also be 62.4 lb. But since the byoyant force is greater than its weight, pine will not stay underwater unless held there.

Calculate how much of its volume will remain under water when it floats.

To do this, we reason that it will sink in the water until it is buoyed up by a force that is equal to its weight.

What weight of water will the 30-lb piece of wood have to displace in order to float? (1) lb
What is the volume of this weight of water? (2) ft³
How much of the wood will be below water level as the block of wood floats? (3) ft³

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An object in a fluid is buoyed up by a force ______ the weight of the fluid displaced

Correct Answer

Explanation

What is the buoyant force exerted on a cubic foot of steel by the water?

Correct Answer

Explanation

how much force would you have to exert to lift the steel under water?

Correct Answer

Explanation

Calculate how much of a wood volume will remain under water when it floats

Correct Answer

Explanation

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