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2 years ago

Plz help........................

Physics

1 answer:

hoa [83]2 years ago

7 0

Answer:

The correct wording is

Pressure increases with the depth of the fluid.
A plane's engines produce thrust to push the plane forward.
A fluid can be a liquid or a gas.
A hydraulic device uses Pascal's principle to lift or move objects.
lift is the upward force exerted on objects by fluids.

Explanation:

1. As you go deeper into a fluid, there is more of it on top of you; therefore, the pressure excreted on you is greater.

2. A plane's engines pushes the air in opposite direction, which according to newton's third law, produces necessary force to move the plane forward.

3. A fluid has no fixed shape, and it deforms under the influence of external forces applied—liquid and gases fit into this definition.

4. Pascal's principle says that pressure applied on one region of the fluid must equal pressure transmitted to another region of the same fluid. This principle is used in a hydraulic device to exert forces on fluids to lift objects that would otherwise be difficult to move.

5. By definition, the upward force exerted by the fluids on objects is the lift.

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2 years ago

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3 years ago

A biconvex lens is formed by using a piece of plastic(n=1.70).

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Answer:

$f =17.15\ cm$

Explanation:

given,

refractive index of lens, n = 1.70

Radius of curvature of front surface. R₁ = 20 cm

Radius of curvature of the back surface, R₂ = 30 cm

focal length= ?

$\dfrac{1}{f}=(n-1)(\dfrac{1}{R_1}-\dfrac{1}{R_2})$

R₁ = +20 cm

R₂ = -30 cm

n = 1.70

$\dfrac{1}{f}=(1.70-1)(\dfrac{1}{20}-\dfrac{1}{-30})$

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3 years ago

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3 years ago

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3 years ago