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3 years ago

In order to decrease the friction an object experiences, you can either change

Physics

1 answer:

Kipish [7]3 years ago

8 0

Answer:

Reduce its weight

Explanation:

For an object on a flat surface, the maximum force of friction experienced by the object is given by:

$F = \mu W$

where

$\mu$ is the coefficient of friction

W is the weight of the object

As we can see from the formula, there are two ways of reducing the friction:

- Decreasing $\mu$ --> this coefficient depends on the material and on the roughness of the surface, so this can be changed by changing the properties of the surface

- Decreasing W, the weight --> this can be done by reducing the mass of the object

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The lens-makers’ equation applies to a lens immersed in a liquid if n in the equation is replaced by n2/n1. Here n2 refers to th

pickupchik [31]

Answer:

The focal length of the lens in water is $f_{water} = 262.68 cm$

The focal length of the mirror in water is $f =79.0cm$

Explanation:

From the question we are told that

The index of refraction of the lens material = $n_2$

The index of refraction of the medium surrounding the lens = $n_1$

The lens maker's formula is mathematically represented as

$\frac{1}{f} = (n -1) [\frac{1}{R_1} - \frac{1}{R_2} ]$

Where $f$ is the focal length

$n$ is the index of refraction

$R_1 and R_2$ are the radius of curvature of sphere 1 and 2 of the lens

From the question When the lens in air we have

$\frac{1}{f_{air}} = (n-1) [\frac{1}{R_1} - \frac{1}{R_2} ]$

When immersed in liquid the formula becomes

$\frac{1}{f_{water}} = [\frac{n_2}{n_1} - 1 ] [\frac{1}{R_1} - \frac{1}{R_2} ]$

The ratio of the focal length of the the two medium is mathematically evaluated as

$\frac{f_water}{f_{air}} = \frac{n_2 -1}{[\frac{n_2}{n_1} - 1] }$

From the question

$f_{air }$ = 79.0 cm

$n_2 = 1.55$

and the refractive index of water(material surrounding the lens) has a constant value of $n_1 = 1.33$

$\frac{f_{water}}{79} = \frac{1.55- 1}{\frac{1.55}{1.44} -1}$

$f_{water} = 262.68 cm$

The focal length of a mirror is dependent on the concept of reflection which is not affected by medium around it.

7 0

3 years ago

Controlled variables

PilotLPTM [1.2K]

Answer:

A control variable in scientific experimentation is an experimental element which is constant and unchanged throughout the course of the investigation.

Explanation:

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A wave transfers _____ from the source outward in the direction of wave motion.

DerKrebs [107]

A wave transfers energy from the source outward in the direction of wave motion.

To add, <span>in physics, a </span>wave<span> is an oscillation accompanied by a transfer of energy that travels through a medium (space or mass). Frequency refers to the addition of time.</span>

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3 years ago

PLEASE ANSWER! A sound Wave with a frequency of 100.0 Hz travels in water with a speed of 1,500 m/s and then travels in air with

Sedaia [141]

Answer:

Explanation:

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3 years ago

How would you describe the movement of a transverse wave?

nlexa [21]

Answer:

Up AND Down

Explanation:

a transverse wave goes up and Down

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3 years ago