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4 years ago

POINTS + BRAINLIEST TO CORRECT ANSWER

Physics

1 answer:

Fudgin [204]4 years ago

8 0

Answer:

5.3 m

Explanation:

Your friend is 1800 mm tall, and you want them to fill half the frame (79 mm / 2 = 39.5 mm).

The film is 116 mm behind the lens. Using similar triangles:

x / 1800 = 116 / 39.5

x = 5286

Rounded to two significant figures, your friend should stand 5.3 meters away.

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Five difference between elastic collision and inelastic collision?

olga_2 [115]

Answer:

Elastic Collision

Inelastic Collision

The total kinetic energy is conserved. The total kinetic energy of the bodies at the beginning and the end of the collision is different.

Momentum does not change. Momentum changes.

No conversion of energy takes place. Kinetic energy is changed into other energy such as sound or heat energy.

Highly unlikely in the real world as there is almost always a change in energy. This is the normal form of collision in the real world.

An example of this can be swinging balls or a spacecraft flying near a planet but not getting affected by its gravity in the end.

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3 years ago

What empirical evidence has led us to believe in the theory of plate tectonics?

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The answer is believed to be C because the evidence is from fossils and glaciers.

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3 years ago

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What is the frequency of a wave having a period equal to 18 seconds

Orlov [11]

Frequency is 1 over the period. Hence, the frequency is 1/18.

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3 years ago

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Which should not be a part of scientific inquiry?

lisabon 2012 [21]

I would say;

a - bias.

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4 years ago

If the value of static friction for a couch is 400N, what could be a possible value of its kinetic friction? *

Dafna11 [192]

Answer:

kinetic friction may be greater than 400 N or smaller than 400 N

Explanation:

As we know that maximum value of static friction on the rough surface is known as limiting friction and the formula of this limiting friction is known as

$F_s = \mu_s N$

now when object is sliding on the rough surface then the friction force on that surface is known as kinetic friction and the formula of kinetic friction is known as

$F_k = \mu_k N$

now we know that

$\mu_k < \mu_s$

so here value of limiting static friction force is always more than kinetic friction

also we know that

initially when body is at rest then static friction value will lie from 0 N to maximum limiting friction

and hence kinetic friction may be greater than static friction or if the static friction is maximum limiting friction then kinetic friction is smaller than static friction

so kinetic friction may be greater than 400 N or smaller than 400 N

5 0

4 years ago