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3 years ago

Why concave lens is called diverging lens

1 answer:

6 0

When a parallel beam of light passes through a convex lens, the rays become farther from one another when the come out. This process of rays is called ''to diverge''. The concave lens makes rays of light diverge, so it is called diverging lens.

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Find the net force FnetFnetF_net acting on the sled. Express your answer in terms of some or all of the variables mmm, sss, v1v1

kkurt [141]

Complete Question

The kinetic energy K of an object of mass m moving at a speed v is defined as . It seems reasonable to say that the speed of an object--and, therefore, its kinetic energy--can be changed by performing work on the object. In this problem, we will explore the mathematical relationship between the work done on an object and the change in the kinetic energy of that object.

Let us now consider the situation quantitatively. Let the mass of the sled be m and the magnitude of the net force acting on the sled be The sled starts from rest.

Consider an interval of time during which the sled covers a distance s and the speed of the sled increases from v_1 to v_2. We will use this information to find the relationship between the work done by the net force (otherwise known as the net work) and the change in the kinetic energy of the sled.

Find the net force acting on the sled.

Express your answer in terms of some or all of the variables m,s, $v_1$ , and v_2.

Answer:

The expression is $F_{net} = \frac{1}{2s} * m * (v_2^2 - v_1^2)$

Explanation:

From the question we are told that

The net force is $F_{net}$

The distance is s

The first velocity is $v_1$

The second velocity is $v_2$

The mass is m

Generally the work energy theorem is mathematically represented as

$W = F_{net} * s$

Also from the law energy conservation workdone is mathematically represented as

$W = \Delta K$

Here $\Delta K$ is the change in kinetic energy and this is mathematically represented as

$\Delta K = \frac{1}{2} * m * \Delta v^2$

$W = \frac{1}{2} * m * \Delta v^2$

Here

$\Delta v^2 = v^2_2 - v^2_1$

Hence

$W = \frac{1}{2} * m * (v_2^2 - v_1^2)$

$F_{net} * s = \frac{1}{2} * m * (v_2^2 - v_1^2)$

=> $F_{net} = \frac{1}{2s} * m * (v_2^2 - v_1^2)$

4 0

3 years ago

Where in the cell can you find the location of inherited traits?

sergejj [24]

Answer:

you will be able to find the inherited traits in the nucleus within the cell, the dna molecule is packaged into thread-like structures called chromosomes.

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3 years ago

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Nearly all of the energy that Earth receives from the Sun is used in photosynthesis. Please select the best answer from the choi

jekas [21]

Answer: False

Explanation:

Earth large amount of energy ( about 174 PW). 30% of this energy reflects back and rest of it is absorbed by clouds, oceans and land mass. Thus, we can say that only some amount of energy that Earth receives from the sun is used in photosynthesis. Photosynthesis is a process that uses carbon-dioxide and water in presence of sunlight and chlorophyll produces oxygen and sugar. Hence, the given statement is false.

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3 years ago

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A negative charge of 4.0 x 10 C and a positive charge of 7.0 x 10 C are separated by 0.15 m. What is the force between the two c

irinina [24]

1117.51N/C hope this helps

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3 years ago

Which of the following is powered by nuclear energy?

MatroZZZ [7]

Submarines. Work on nuclear marine propulsion in the 1940's, and the first reactor started up in the USA in 1953.

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