Ask question

Ask question

All categories

AleksAgata [21]

3 years ago

10

a macine that increases speed, a machine that changes the direction of force and a machine that increases force

1 answer:

jasenka [17]3 years ago

7 0

Machine that increases speed, a machine that increases direction of force, and a machine that increases force. A bicycle increases speed, an ax changes direction of force, and a car jack increases force. contrast the scientific definition of work with it's everyday meaning.

You might be interested in

A flat sheet is in the shape of a rectangle with sides of lengths 0.400 m and 0.600 m. The sheet is immersed in a uniform electr

ch4aika [34]

Freeeeeeeeeeeeeeeeeeeeee

6 0

3 years ago

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:

a

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

b

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 $n_1 = 1.33$

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

$f_{water} = 262.68 cm$

b

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

A cyclist accelerates from a set of traffic lights.

Andrews [41]

Work equals Force times Distance. So Work = 250 Newton’s * 5 meters Work = 1,250

3 0

3 years ago

If you were to measure the number of liters of gas trapped in a bottle which of the following will you be describing

AnnyKZ [126]

B I'm pretty sure, took a test

5 0

3 years ago

Read 2 more answers

What form of energy is most abundant on earth

Kipish [7]

Solar energy is the most abundant energy resource on earth.

4 0

4 years ago