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3 years ago

Why is gravity an example of scientific theory?

2 answers:

4 0

-- The theory of gravity gives a good explanation for things
that we see happening.

-- The theory of gravity predicts things that turn out to be true
when we test them.

-- Nobody has come up with a different theory that explains things better
and makes more accurate predictions that the theory of gravity does.

-- The theory of gravity can't be proved.

yarga [219]3 years ago

4 0

Sir Isaac Newton made up the law of gravity. This involved using the scientific theory.

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How can you use weights of the filled cell models to determine the rate and direction of diffusion?

nikklg [1K]

Compare the initial mass to the final mass.

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3 years ago

There is no vegetation present within the alpine biome.

Angelina_Jolie [31]

Answer:

false, i just took the test.

Explanation:

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4 years ago

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COMPARE: How were the outcomes of Pasteur’s and Redi’s experiments similar? Both experiments proved that life can come from rott

Katen [24]

Both experiments showed that the living things only come from living things

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3 years ago

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A 45kg skater and a 60kg skater are standing still, holding hands on frictionless ice. They push away from each other in opposit

frutty [35]

Answer:

The 60 kg skater is traveling at 2.63 m/s in the opposite direction from the 45 kg skater.

Explanation:

The velocity of the 60 kg skater can be found by conservation of linear momentum:

$P_{i} = P_{f}$

$m_{a}v_{i_{a}} + m_{b}v_{i_{b}} = m_{a}v_{f_{a}} + m_{b}v_{f_{b}}$ (1)

Where:

$m_{a}$ : is the mass of the first skater = 45 kg

$m_{b}$ : is the mass of the second skater = 60 kg

$v_{i_{a}}$ : is the initial speed of the first skater = 0 (he is standing still)

$v_{i_{b}}$ : is the initial speed of the second skater = 0 (he is standing still)

$v_{f_{a}}$ : is the final speed of the first skater = 3.5 m/s

$v_{f_{b}}$ : is the final speed of the second skater =?

By replacing the above values into equation (1) and solving for $v_{f_{b}}$ we have:

$0 = m_{a}v_{f_{a}} + m_{b}v_{f_{b}}$

$v_{f_{b}} = \frac{-m_{a}v_{f_{a}}}{m_{b}} = \frac{-45 kg*3.5 m/s}{60 kg} = -2.63 m/s$

The minus sign is because the 60 kg skater is moving in the opposite direction from the other skater.

Therefore, the 60 kg skater is traveling at 2.63 m/s in the opposite direction from the 45 kg skater.

I hope it helps you!

4 0

3 years ago

How does flowing water change the earths surface

Art [367]

Deposition occurs when gravity's downward pull on sediment is greater than the push of flowing water<span> or wind. Rivers and streams erode soil, rock, and sediment. Sediment is tiny grains of broken-down rock.</span>

3 0

3 years ago