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3 years ago

14

An object 20cm high is placed at a distance of 100 cm from a plane mirror. The height of the image will be.

1 answer:

Mandarinka [93]3 years ago

6 0

B) 20 cm

The height and distance will be the same. Only the image will be laterally inverted.

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The benefits of jumping rope include: (which of these things)

Svetach [21]

Answer:

E. All of the Above

Explanation:

By doing any kind of exercise or physical activity, you are increasing your overall health. Your muscle strengthen because of the jumping and movement of arms. You are more alert because you have to time each jump right in order to keep going. By breathing evenly while jumping, you do help your Cardiorespiratory fitness as well. And of course, you increase your athletic ablility over all with much endurance and practice.

3 0

3 years ago

A sphere of radius R contains charge Q spread uniformly throughout its volume. Find an expression for the electrostatic energy c

tensa zangetsu [6.8K]

Answer:

$E = \frac{3kQ^2}{5R}$

Explanation:

Let the sphere is uniformly charge to radius "r" and due to this charged sphere the electric potential on its surface is given as

$V = \frac{kq}{r}$

now we can say that

$q = \frac{Q}{\frac{4}{3}\pi R^3} (\frac{4}{3}\pi r^3)$

$q = \frac{Qr^3}{R^3}$

now electric potential is given as

$V = \frac{k\frac{Qr^3}{R^3}}{r}$

$V = \frac{kQr^2}{R^3}$

now work done to bring a small charge from infinite to the surface of this sphere is given as

$dW = V dq$

$dW = \frac{kQr^2}{R^3} dq$

here we know that

$dq = \frac{3Qr^2dr}{R^3}$

now the total energy of the sphere is given as

$E = \int dW$

$E = \int_0^R \frac{kQr^2}{R^3} (\frac{3Qr^2dr}{R^3})$

$E = \frac{3kQ^2}{R^6} (\frac{R^5}{5} - 0)$

$E = \frac{3kQ^2}{5R}$

7 0

4 years ago

The origin of the universe remains a question. true false

OleMash [197]

True ..............................

8 0

3 years ago

The left hemisphere of the brain controls the right side of the body. Please select the best answer from the choices provided T

olga nikolaevna [1]

Answer:

True

Explanation:

The different sides control the opposite side of the human body

4 0

2 years ago

A tank is 2/9 full when it is filled with 16 litre of water.How much water will there be when the tank is full

Sati [7]

=9/2×16 =72 liters in the tank

4 0

3 years ago