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3 years ago

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What is air pressure?

1 answer:

dolphi86 [110]3 years ago

5 0

Answer:

A. Earth's gravity pulling down on air molecules

Explanation:

Air pressure refers to the weight of the air per unit surface area. It is the amount of gravitational force which is pulling down the molecules of air.

The common unit of air pressure is: Pascal, atm

1 atm = 101325 Pa

As the column of the air above increases, the air pressure increase. This is because with the increase in amount of air, the weight increase of the air increases. This is the reason a diver feels immense pressure in the sea and cooking takes a lot of time on hilly areas because of low air pressure.

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A 33.0-kg child starting from rest slides down a water slide with a vertical height of 15.0 m. (Neglect friction.)

Temka [501]

This question involves the concept of the conservation of energy.

(a) The child's speed halfway will be "12.13 m/s".

(b) The child's speed three-fourth way will be "14.86 m/s".

(a)

Using the <em>law of conservation of energy</em>:

Potential Energy Lost = Kinetic Energy Gained

$mgh = \frac{1}{2}mv^2\\\\2gh = v^2\\\\v = \sqrt{2gh}$

where,

v = speed = ?

g = acceleration due to gravity = 9.81 m/s²

h = height lost = halfway = height/2 = 15 m/2 = 7.5 m

Therefore,

$v = \sqrt{(2)(9.81\ m/s^2)(7.5\ m)}$

<u>v = 12.13 m/s</u>

<u />

(b)

Using the <em>law of conservation of energy</em>:

Potential Energy Lost = Kinetic Energy Gained

$mgh = \frac{1}{2}mv^2\\\\2gh = v^2\\\\v = \sqrt{2gh}$

where,

v = speed = ?

g = acceleration due to gravity = 9.81 m/s²

h = height lost = three-fourth way down = $\frac{3}{4}height = \frac{3}{4}(15\ m) = 11.25\ m$

Therefore,

$v = \sqrt{(2)(9.81\ m/s^2)(11.25\ m)}$

<u>v = 14.86 m/s</u>

<u />

Learn more about the <em>law of conservation</em> of energy here:

brainly.com/question/20971995?referrer=searchResults

The attached picture shows the <em>law of conservation of energy</em>.

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3 years ago

Which processes transfer energy from the core to the photosphere?

nikklg [1K]

<span>-radiation and convection

Hope this helps :)
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A soccer ball rolls to a stop of 21 m/s with a deceleration of -2.0 m/s. How far does it roll until it stops?

Luba_88 [7]

Answer:110.25 m

Explanation:v^2 = u^2 + 2as

21^2 = 0 - 2*2*s

s = 441/4

s=110.25 m

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3 years ago

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To calculate work done on an object, _____. A. multiply the force in the direction of motion by the distance the object moved B.

o-na [289]

I believe your answer would be B, hope it helps

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3 years ago

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Pls help it's due today

mario62 [17]

Answer:

Breh seriously. Ugh fine.

1.B

2.D

3.C

4.C

5.D,A and B

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