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3 years ago

Describe atmospheric pressure and water pressure

Physics

1 answer:

OverLord2011 [107]3 years ago

6 0

Answer:

The difference is that water is an incompressible fluid — its density is almost constant as the pressure changes — while air is a compressible fluid — its density changes with pressure. ... Atmospheric pressure is the pressure exerted on a surface by the weight of the atmosphere (a compressible fluid) above it

Explanation:

change some words

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Which of the following do the objects in the four categories of small objects in the solar system all have in common?

Eva8 [605]

A) They all orbit the sun

because they all are attracted through the forces of gravity.

4 0

3 years ago

Give me an example of theory

horrorfan [7]

Answer:

theory is an idea to explain something,

Explanation:

Einstein's ideas about relativity are an example of the theory of relativity.

3 0

3 years ago

Read 2 more answers

A 55 kg skier is at the top of a slope. The vertical distance between start and finish is 10m. (a) What is her Potential Energy?

Blababa [14]

Explanation:

Given that,

Mass of a skier, m = 55 kg

The vertical distance between start and finish is 10 m.

(a) The potential energy of a skier is given by :

$E=mgh\\\\E=55\times 9.8\times 10\\\\=5390\ J$

(b) When she reaches the bottom of the hill, the potential energy is converted to kinetic energy. So,

$5390=\dfrac{1}{2}mv^2\\\\v=\sqrt{\dfrac{2\times 5390}{55}} \\\\v=14\ m/s$

Hence, her potential energy is 5390 J and at the bottom of the hill she is moving with a speed of 14 m/s.

6 0

3 years ago

A single force acts on a 2.0 kg particle-like object in such a way that the position of the object as a function of time is give

kaheart [24]

Answer:

The work done by the force is 1435 Joule.

Explanation:

You have to apply the work-energy theorem, which associates the work and the mechanical energy

W of all non conservative forces = ΔEm = Emb - Ema

where Emb is the mechanical energy in point b and Ema is the mechanical energy in point a

Is also known that mechanical energy is the sum of potential energy and kinetic energy.

In this case, there is only kinetic energy because the potential energy is given by conservative forces like the weight but the weight is perpendicular to the displacement and because of that it doesn't produce work.

So, the work is given by:

W= Ekb - Eka, where Ek is the kinetic energy

By definition the kinetic energy is given by:

$Ek=\frac{1}{2}mV^{2}$ where m is the mass and V is the speed.

Replacing the definition of Ek in the equation of work:

$W=\frac{1}{2}mVb^{2} - \frac{1}{2}mVa^{2}$

So, you have to calculate the speed in point a and in point b

You can calculate the velocity of the object as a function of time derivating the equation of the position:

$V(t) = \frac{dX(t)}{dt} = \frac{d(3.0t-4.0t^{2}+1.0t^{3}) }{dt}$

$V(t)=3.0-8.0t+3.0t^{2}$

Replacing t=0 s to obtain the speed in the initial point (point a)

Va=3.0-8(0)+3.0(0)(0)

Va=3.0 m/s

Replacing t=5.0 to obtaing the speed in final point (point b)

Vb= 3-8(5)+3(5)(5) = 38 m/s

Therefore the work is:

$W = \frac{1}{2}(2.0)(38)^{2} - \frac{1}{2}(2.0)(3^{2}) =1444 - 9 = 1435 [J]$

Where J is Joules, the unit for work.

8 0

3 years ago

Velocity (m/s)

alekssr [168]

Explanation:

⠀

(a) The segment A shows acceleration as velocity increases with the increase in time.

⠀

(b) The segment C shows the object is slowing down as the time increases in segment C, the velocity decreases and afterwards it comes to rest.

⠀

(c) The velocity is segment B is 40m/s. And in the diagram there is no change in velocity.

⠀

(d) The acceleration of segment B is zero. As there in no change in curve and it is moving with uniform velocity.

⠀

$\:$

<h2>Thank you!</h2>

3 0

2 years ago

Describe atmospheric pressure and water pressure​

Describe atmospheric pressure and water pressure