Homework 15-Buoyant force

If an object weighing 50.0 N displaces a volume of water with a weight of 10.0 N, what is the buoyant force on the object?

• 60.0 N

• 50.0 N

• 40.0 N

• 10.0 N

In which of the following situations will an object sink?

• The mass density of the object is less than the mass density of the fluid.

• The buoyant force on the object is equal to the weight of the object.

• The mass density of the fluid is less than the mass density of the object.

• The weight of the fluid displaced equals the weight of the object.

What is water displacement used to find?

• volume

• mass

• density

An object should float in a liquid if...

• Its denser than the liquid

• It's the same density as the liquid

• It's less dense than the liquid

What is buoyancy?

• The ability of an object to float on the water

• The ability of an object to sink on the water

A ship will sink as long as the buoyant force is

• less than the ship’s weight

• equal to the ship’s weight

• greater than the ship’s speed

• less than the ship’s speed

In a car lift, compressed air exerts a force, F₁ on a small piston having a radius of 5.5 cm. This pressure is transmitted to a second piston of radius 20 cm as shown in figure above. The mass of the car is 1250 kg.

Calculate the pressure on the smaller piston F_1.

• 6.25 kPa

• 61.31 kPa

• 97.57 kPa

• 306.56 kPa

If air flow velocity increases, air pressure will also increase

• True

• False

Bernoulli's principle states that

• pressure is transmitted equally in all directions in the fluid

• buoyant force is equal to the weight of fluid displaced

• when the velocity of a fluid increases, the pressure in the fluid decreases