Why is random sampling and random assignment in experimental research important?

Physics

1 answer:

Hunter-Best [27]3 years ago

6 0

So the result is not biased or affected in some way

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Pump A can fill a tank of water in 5 hours. Pump B can fill the same tank in 8 hours. How long does it take the two pumps workin

valina [46]

Answer:

It will take both pumps 3.08 hours to fill the tank working together.

Explanation:

Pump A can fill the tank in 5 hours. Assuming that the pump gives out a steady flow of water, in one hour, pump A can fill 1/5th of the tank. Similarly, pump B in an hour, fills up 1/8th of the tank.

We must add up these two values, in order to find how much of the tank the two pumps can fill up together in one hour.

1/5 +1/8 =13/40

So 13/40 of the tank is filled in an hour. We need to find how many hours it will take for the entire tank to be filled. To do so, divide 40 by 13. This gives:

3.08 hours to fill up the tank.

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3 years ago

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A horizontal force of 90.0 N is required to push a 75kg object along a horizontal surface at a constant speed. What is the magni

Varvara68 [4.7K]

If the object is moving at a constant speed, acceleration is 0. So:

$F = ma

F = m\times 0

F = 0$

The resultant force is 0. So the force pushing the object must be equal to the friction force acting, so

Friction = 90 N

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3 years ago

Dynamo converts the

Sav [38]

Answer:

$\gamma \: dynamo \: converts \: the \: mechanical \: energy \: into \: electrical \: energy \: .$

Explanation:

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Two security professionals - Jo and Chris - are discussing the contracting process.

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Explain Alfred wegener's hypothesis

grandymaker [24]

He proposed the theory of Continental Drift. He believed that all of the continents were once joined together in a super continent he called Pangea (not sure if that's spelled right I studied this awhile ago). He proved this by showing similarities in fossils in completely different continents and showing how well the continents could fit together.

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