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Yakvenalex [24]
3 years ago
11

Which of the following represents an image that is located behind a mirror?

Physics
2 answers:
9966 [12]3 years ago
3 0

Answer:

i think its -di........

Marina CMI [18]3 years ago
3 0

Explanation:

There are some conventions while solving the problems based on mirrors. All parameters are taken like x-y coordinate system.

All the measurements are done from the optical centre of the mirror.

d_i is the image distance

d_o is the object distance

-d_i is the image distance which is formed behind the mirror.

-d_o is the object distance when an object is placed behind the mirror.

So, -d_i shows the image that is located behind the mirror. Hence, this is the required solution.

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tresset_1 [31]

Explanation:

The unit of work done is in Joules

Work done is a physical quantity that is defined as the force applied to move a body through a particular distance.

Work is only done when the force applied moves a body through a distance.

    Work done  = Force x distance

The maximum work is done when the force is parallel to the distance direction.

The minimum work is done when the force is at an angle of 90° to the distance direction.

 So to solve this problem;

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3 years ago
A block of mass 0.500 kg is pushed against a horizontal spring of negligible mass until the spring is compressed a distance x (F
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Answer:

Part a)

x = 0.4 m

Part b)

v_i = 11.7 m/s

Part c)

Speed is more than the required speed so it will reach the top

Explanation:

Part a)

As we know that there is no frictional force while block is moving on horizontal plane

so we can use energy conservation on the block

\frac{1}{2}mv^2 = \frac{1}{2}kx^2

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Part b)

If the track has average frictional force of 7 N then work done by friction while block slides up is given as

W_f = -7( \pi R)

W_f = -7(\pi \times 1.00)

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work done against gravity is given as

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W_g = -(0.500)(9.8)(2\times 1)

W_g = -9.8 J

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\frac{1}{2}0.5(12^2) - 9.8 - 22 = \frac{1}{2}(0.5)v_f^2

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Part c)

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mg = \frac{mv^2}{R}

v = \sqrt{Rg}

v = 3.13 m/s

so here we got speed more than the required speed so it will reach the top

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