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3 years ago

URGENT Why is understanding motion so important? Be sure to explain in your own words.

Physics

1 answer:

levacccp [35]3 years ago

3 0

Answer:

Motion is one of the important issues of Physics. We know that if we are not moving but still earth is moving. Motion is a bit of the machinist's Department of Physics. Several laws are provided for explaining the theory of motion and evolution in motion. The motion and transformation are defined in terms of strength which is wanted for creating an object in a motion state.

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Find the heat energy is required to change 2Kg of ice at 0 C to water at 20 C ( specific latent heat of fusion of water = 336000

katrin2010 [14]

We want to find the energy that we need to transform 2kg of ice at 0°C to water at 20°C.

We will find that we must give 840,000 Joules.

First, we must change of phase from ice to water.

We use the specific latent heat of fusion to do this, this quantity tells us the amount of energy that we need to transform 1 kg of ice into water.

So we need 336,000 J of energy to transform 1kg of ice into water, and there are 2kg of ice, then we need twice that amount of energy:

2*336,000 J = 672,000 J

Now we have 2kg of water at 0°C, and we need to increase its temperature to 20°C.

Here we use the specific heat, it tell us the amount of energy that we need to increase the temperature per mass of water by 1°C.

We know that:

specific heat of capacity of water = 4200 J/kg°C

This means that we need to give 4,200 Joules of energy to increase the temperature by 1°C of 1kg of water.

Then to increase 1°C of 2kg of water we need twice that amount:

2*4,200 J = 8,400 J

And that is for 1°C, we need to give that amount 20 times (to increase 20°C) this is:

20*8,400 J = 168,000 J

Then the total amount of energy that we must give is:

E = 672,000 J + 168,000 J = 840,000 J

If you want to learn more, you can read:

brainly.com/question/12474790

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3 years ago

A cabbie is trying to stop when he notices a fare is whistling them over. The car has 18750 J of energy. If the cab is 2100 kg.

Bogdan [553]

Answer:

Explanation:

ASSUMING that the cab has ONLY kinetic energy,

(it's not sitting over a loaded spring, high on a hill, on fire)

KE = ½mv²

v = √(2KE/m)

v = √(2(18750)/2100) = √17.85714...

v = 4.225771...

v = 4.23 m/s or about 15.2 km/hr

5 0

3 years ago

Your friend turns the volume up on their speaker system, so that the sound intensity is 4 times greater than it was beforehand.

erica [24]

Answer:

Explanation:

We know that intensity I = P/A where P = power and A = area through which the power passes through.

Now, let the initial intensity of the speaker be I₀ and its initial power be P₀. Since the intensity is increased by a factor of 4, the new intensity be I and new power be P.

So, I = P/A and I₀ = P₀/A

Now, if I = 4I₀,

P/A = 4P₀/A

P = 4P₀

Now, energy E = Pt, where t = time. So, P = E/t and P₀ = E₀/t

Substituting P and P₀ into the equation, we have

P = 4P₀

E/t = 4E₀/t

E = 4E₀

Since the energy is four times the initial energy, the energy output increases by a factor of 4.

4 0

3 years ago

it is proposed to use a small waterfall to turn an electricity generator. 10 meter cube of water fall 50m per minute. only one-f

nirvana33 [79]

This question is related to density where 16.7 kW power is used.

<h3>What is Density?</h3>

Density is defined as mas per unit volume. It is denoted by ρ

We know the density of water is 1000kg/m³.

The given volume is 10m³. we have to find the mass. i.e. 10000 kg.

We know that $Density =\frac{mass}{Volume}$

Mass = Density x Volume

Mass = 1000kg/ m³ x 10m³ = 10000kg.

Here, We know that work against gravity is mgh.

So, 10000 kg x 10 m/s² x 50m = 5000000J.

But only one fifth of its energy is used.

5000000 / 5 = 1000000

Now we have the work done and time, so lets solve power.

Power=work done /time

1000000/60sec.

Power =16666.67 or 16.7kW

For more density related question visit here:

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8 0

3 years ago

313 / 5000

alexgriva [62]

i dont know but hey Explanationh:

3 0

3 years ago

*URGENT* Why is understanding motion so important? Be sure to explain in your own words.

URGENT Why is understanding motion so important? Be sure to explain in your own words.