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denis-greek [22]
3 years ago
10

What is the speed of a runner that runs 400m in 48.42 seconds?

Physics
1 answer:
nika2105 [10]3 years ago
3 0

Answer:

The speed is that it would take 121.05 seconds to run a kilometer.

Explanation:

Since there are 1000 meters in a kilometer, divide 400 meters by 4, and 48.42 by 4. Then you get 100 meters equals 12.105 seconds. Multiply that by ten, and you get 121.05 seconds

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Two charged objects, A and B, are exerting an electric force on each other. What will happen if the charge on A is increased?
ozzi

Answer: The forces acting on both of them will increase in magnitude.

Explanation:

According to Coulomb's law, the electrostatic force between two bodies is proportional to the product of their two charges. If the charge on A is increased this product increases in size (it must have been non-zero to begin with, since there was a force between them at first). Thus, the force between them rises.

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3 years ago
The conservation laws, show ift<br>te-te​
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Answer:

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3 years ago
7. When initially-unpolarized light passes through three polarizing filters, each oriented at 45 degree angles from the precedin
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Answer:

Explanation:

Let the intensity  of unpolarised light be I₀ . After passing through the first polarising filter , the intensity  is I₀ / 2 .

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After third filter , the intensity will be I₀ / 4  x cos²45 = I₀ / 8 .

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7 0
3 years ago
What is an independent variable
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Explanation:

8 0
3 years ago
The Atwood machine consists of two masses hanging from the ends of a rope that passes over a pulley. Assume that the rope and pu
Kisachek [45]

Answer:

a=2.36\ m/s^2

T=157.06 N

Explanation:

Given that

Mass of first block = 21.1 kg

Mass of second block = 12.9 kg

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Given that pulley and string is mass  less that is why both mass will have same acceleration.So lets take their acceleration is 'a'.

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m_1g-m_2g=(m_1+m_2)a

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m_1g-T=m_1a

T=m_1(g-a)

T=21.1(9.81-2.36) N

T=157.06 N

6 0
3 years ago
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