Pick whether each statement is true or false.

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A liquid is more compressible than a gas.
-- My Answer: False
A fluid can do work on a solid object.
-- My Answer: True
Both liquids and gasses are fluids.
-- My Answer: True
The force exerted by a fluid always acts perpendicular to the solid surface it is in contact with.
-- My Answer: False

I would love to know if my answers are correct. Thanks!

The force exerted by a fluid always acts perpendicular to the solid surface it is in contact with.

-- My Answer: False
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Well, this is true at zero speed where there is no friction. All you have is pressure forces, normal to boundaries. However in the real world at speed, for example pressure losses in a narrow pipe, you are indeed correct.

Your answers are correct! Here's why:

1. A liquid is more compressible than a gas. (False)
- Liquids are generally considered to be incompressible, meaning they cannot be easily compressed. Gases, on the other hand, are compressible and can be easily compressed under pressure.

2. A fluid can do work on a solid object. (True)
- Yes, a fluid can do work on a solid object. When a fluid, such as water or air, flows against a solid object, it exerts a force on it, which can result in work done on the object. For example, wind can do work by pushing or turning a windmill.

3. Both liquids and gases are fluids. (True)
- Correct! Liquids and gases are both classified as fluids. Fluids are substances that can flow and conform to the shape of a container. Liquids have a definite volume but take the shape of the container, while gases have neither a definite shape nor volume.

4. The force exerted by a fluid always acts perpendicular to the solid surface it is in contact with. (False)
- This statement is false. The force exerted by a fluid on a solid surface depends on various factors, including the angle at which the fluid hits the surface. The force can act perpendicular to the surface (normal force) or at an angle (shear force). For example, when water flows over a flat plate, the force on the plate is generally perpendicular to its surface, but when water flows over an inclined plate, the force exerted will have both perpendicular and parallel components to the surface.