Contents

- 1 Would the water level in a canal lock go up or down if a battleship in the lock were to sink?
- 2 How does the pressure exerted by a liquid change with depth in the liquid?
- 3 What is the relationship between the weight of the object and the weight of the displaced water?
- 4 Which of the following helps explain why the buoyant force exerted on an object submerged in a fluid on earth is always directed upward?
- 5 Why do boats float and rocks sink answer key?
- 6 How can a submarine choose to sink or float?
- 7 What is the pressure at the bottom of a swimming pool that is 3 meters in depth?
- 8 What does not affect the pressure at a point beneath the surface of a liquid?
- 9 What is Pascal’s law for Class 8?
- 10 How do you find the weight of displaced water?
- 11 What is the weight of the displaced water?
- 12 Why must this much water be displaced in order for the system to float?
- 13 What is the apparent weight of a submerged object?
- 14 What does it mean if an object is neutrally buoyant?
- 15 What are the 3 types of buoyancy?

## Would the water level in a canal lock go up or down if a battleship in the lock were to sink?

An object floating in the water displaces its weight of water, which is more than its own volume, while a submerged object displaces only its volume. The water level in a canal lock falls if a battleship in lock sank. While the water is being supported it displaces more amount of water than submerged ones so it falls.

## How does the pressure exerted by a liquid change with depth in the liquid?

The pressure in a liquid is different at different depths. Pressure increases as the depth increases. The pressure in a liquid is due to the weight of the column of water above. The greater pressure at the bottom would give a greater ‘force per unit area’ on the wall.

## What is the relationship between the weight of the object and the weight of the displaced water?

An object will float if the buoyancy force exerted on it by the fluid balances its weight, i.e. if FB=mg F B = mg. But the Archimedes principle states that the buoyant force is the weight of the fluid displaced. So, for a floating object on a liquid, the weight of the displaced liquid is the weight of the object.

## Which of the following helps explain why the buoyant force exerted on an object submerged in a fluid on earth is always directed upward?

The buoyant force comes from the pressure exerted on the object by the fluid. Because the pressure increases as the depth increases, the pressure on the bottom of an object is always larger than the force on the top – hence the net upward force.

## Why do boats float and rocks sink answer key?

The force of gravity yields a downward force and a buoyancy force yields an upward force. If the gravitational force is less than the buoyancy force then the object floats (a boat ), otherwise it sinks (a rock ). That is, if an object weighs less than the amount of water it displaces then it floats otherwise it sinks.

## How can a submarine choose to sink or float?

A submarine or a ship can float because the weight of water that it displaces is equal to the weight of the ship. Unlike a ship, a submarine can control its buoyancy, thus allowing it to sink and surface at will.

## What is the pressure at the bottom of a swimming pool that is 3 meters in depth?

The pressure at the bottom of a 3 – meter deep swimming pool is 29,400 pa.

## What does not affect the pressure at a point beneath the surface of a liquid?

Pressure within a liquid depends only on the density of the liquid, the acceleration due to gravity, and the depth within the liquid.

## What is Pascal’s law for Class 8?

Pascal’s law states that whenever any pressure is applied to any part of the boundary of a confined fluid, it is transmitted equally in all directions irrespective of the area on which it acts, and always acts at right angles to the surface of the containing vessel.

## How do you find the weight of displaced water?

If you want to know the weight of the displaced water, simply measure its volume and multiply by the density of water.

## What is the weight of the displaced water?

The weight of the displaced fluid can be found mathematically. The mass of the displaced fluid can be expressed in terms of the density and its volume, m = ρV. The fluid displaced has a weight W = mg, where g is acceleration due to gravity. Therefore, the weight of the displaced fluid can be expressed as W = ρVg.

## Why must this much water be displaced in order for the system to float?

The less dense an object is, the more fluid itwill displace per unit mass. 5.0 L 24) Why must this much water be displaced in order for the system to float? Because that’s the volume of water that weighs 49.0 N: the weight of the brick!

## What is the apparent weight of a submerged object?

The apparent weight of a floating object is zero. This effect is quite different from the accelerating lift examples. A floating or immersed object is not accelerating upwards or downwards, so there can be no net force. In fact, buoyancy provides a supporting force exactly as the ground does.

## What does it mean if an object is neutrally buoyant?

If it rises and floats up, it’s positively buoyant. An object is neutrally buoyant when it has an equal tendency to float and sink. It doesn’t go up or down.

## What are the 3 types of buoyancy?

The three types of buoyancy are positive buoyancy, negative buoyancy, and neutral buoyancy. Positive buoyancy is when the immersed object is lighter than the fluid displaced and this is the reason why the object floats.