Pleaaaase help meeee

Why are renewable energy resources going to be important in our future

marshall27 [118]

Renewable resources are going to be important in our future because if we use up all of our NON-renewable resources now, then we’ll still have the renewable resources to depend on.
I hope this helped! :-)

3 0

4 years ago

Everything in or on water pushes some water aside, even if it's just a little bit.

makvit [3.9K]

Answer:

This is called displacement.

Everything in or on water pushes some water aside, even if it’s just a little bit. This is called displacement.

8 0

4 years ago

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In a ruby laser, an electron jumps from a higher energy level to a lower one. if the energy difference between the two levels is

Vaselesa [24]

The wavelength of the emitted photon is( $\lambda$ )= 690nm

<h3>How can we calculate the wavelength of the emitted photon?</h3>

To calculate the wavelength of the photon we are using the formula,

$\triangle E= \frac{h\times c}{\lambda}$

Or, $\lambda= \frac{h\times c}{\triangle E}$

We are given here,

$\triangle E$ = The energy difference between the two levels = 1. 8 ev= $1.8\times 1.6 \times 10^{-19}$ C.

h= Planck constant = $6.626\times 10^{-34}$ Js.

c= speed of light = $3\times10^8$ m/s.

We have to find the wavelength of the emitted photon = $\lambda$ m.

Therefore, we substitute the known parameters in the above equation, we can find that,

$\lambda= \frac{h\times c}{\triangle E}$

Or, $\lambda= \frac{6.626\times 10^{-34}\times 3\times 10^8}{1.8\times 1.6 \times 10^{-19}}$

Or, $\lambda= 690\times 10^{-9}$ m

Or, $\lambda$ =690 nm.

From the above calculation we can conclude that the wavelength of the emitted photon is 690nm.

Learn more about ruby laser:

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8 0

2 years ago

A 3874-kg rollercoaster is brought to the top of a 42m hill in 40 seconds,then drops 28m before the next hill.

Ede4ka [16]

(a) The work required to get the coaster to the top of the first hill is 1,594,538.4 J.

(b) The power required to bring the train to the top of the first hill is 39,863.46 W.

(c) The energy lost when the coaster drops is 531,512.8 J.

(d) The left at the bottom is determined as 1,063,025.6 J.

<h3>Work done to bring the rollercoaster top of the hill</h3>

W = Fn x d = mgh

W = 3874 x 9.8 x 42

W = 1,594,538.4 J

<h3>Power dissipated in bringing the rollercoaster on top hill</h3>

P = Fv

P = Fd/t

P = W/t

P = 1,594,538.4 /40 = 39,863.46 W

<h3>Energy lost when the coaster drops</h3>

E = 1,594,538.4 - (3874 x 9.8 x 28)

E = 531,512.8 J

<h3>Energy left at the bottom</h3>

E = 3874 x 9.8 x 28 = 1,063,025.6 J

Learn more about energy here: brainly.com/question/13881533

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6 0

2 years ago

If a ball is tossed straight up into the air, at what position is its potential energy the greatest? Question 3 options: When it

Gennadij [26K]

The ball has the greatest potential energy when it reaches the top of its flight. Option C is correct.

<h3>What is potential energy?</h3>

The potential energy of a body or object is due to its position. The ball has the greatest potential energy when it reaches the highest point.

$U = mgh$

Where,

$U$ - potential energy

$m$ - mass

$g$ - gravitation acceleration

$h$ - height

Since the mass and gravitation acceleration is constant hence potential energy will be directly proportional to the height of the ball.

Therefore, the ball has the greatest potential energy when it reaches the top of its flight.

Learn more about potential energy:

brainly.com/question/1250558

7 0

3 years ago