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cluponka [151]
3 years ago
9

Water flows with constant speed through a garden hose that goes up to 27.5 cm high. if the water pressure is 132kpa at the botto

m of the step, what is its pressure at the top of the step?
Physics
1 answer:
sergejj [24]3 years ago
6 0

Answer:

The pressure at the top of the step is 129.303 kilopascals.

Explanation:

From Hydrostatics we find that the pressure difference between extremes of the water column is defined by the following formula, which is a particular case of the Bernoulli's Principle (v_{bottom}\approx v_{top}):

p_{bottom}-p_{top} = \rho\cdot g\cdot \Delta h (1)

p_{bottom}, p_{top} - Total pressures at the bottom and at the top, measured in pascals.

\rho - Density of the water, measured in kilograms per cubic meter.

\Delta h - Height difference of the step, measured in meters.

If we know that p_{bottom} = 132000\,Pa, \rho = 1000\,\frac{kg}{m^{3}}, g = 9.807\,\frac{m}{s^{2}} and \Delta h = 0.275\,m, then the pressure at the top of the step is:

p_{top} = p_{bottom}-\rho\cdot g\cdot \Delta h

p_{top} = 132000\,Pa-\left(1000\,\frac{kg}{m^{3}} \right)\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot (0.275\,m)

p_{top} = 129303.075\,Pa

p_{top} = 129.303\,kPa

The pressure at the top of the step is 129.303 kilopascals.

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Luda [366]
Hello!

Answer and explanation:

There are three main sources of heat in the deep earth:

1) heat from when the planet formed and accreted, which has not yet been lost.

2)frictional heating, caused by denser core material sinking to the center of the planet.

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Have a good day
4 0
3 years ago
Read 2 more answers
A 15 N force is applied to a 12 kg box for 6 s. The box is initially at rest. What is the speed of the box at the end of the 6 s
Gre4nikov [31]

Answer:

The speed of the box at the end of the 6 s interval is 7.5 m/s.

Explanation:

Given;

magnitude of the force, f = 15 N

mass of the box, m = 12 kg

initial velocity of the box, u = 0

time of the box motion, t = 6s

The applied force on the box is given by Newton's second law of motion;

f = ma

where;

a is the acceleration of the box

a = f / m

a = (15) / (12)

a = 1.25 m/s²

The final velocity of the box is calculated as;

v = u + at

v = 0 + (1.25 x 6)

v = 7.5 m/s.

Therefore, the speed of the box at the end of the 6 s interval is 7.5 m/s.

6 0
3 years ago
What force does it take to accelerate a 9.2 kg object 7.0 m/s^2?
Ulleksa [173]

Answer:

<h2>64.4 N</h2>

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question

mass = 9.2 kg

acceleration = 7 m/s²

We have

force = 9.2 × 7 = 64.4

We have the final answer as

<h3>64.4 N</h3>

Hope this helps you

5 0
3 years ago
If you just saw a shooting star and wanted to write about the moment, which would be the best type of poem to write? a haiku a n
Norma-Jean [14]
I personally would write it in a Ballad format.
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Narrative poems tells a story often making the voices of the/a narrator or character.

Haiku poems rarely rhyme. 

Sonnet poems are rhythmic.
6 0
4 years ago
What is the function of the commutator in a DC motor? A. to spin the magnet B. to change direct current into alternating current
sergejj [24]

Answer

Correct Answer is B(to change direct current into alternating current)

Explanation

commutation

The main aim of commutation is to maintain the torque acting on armature of DC motros in the same direction.

commutator  a switch which is used to convert the direction of flow of electric current  it is connected to the armature of DC motor.

In DC motors, voltage across the armature is alternating in nature. The direction of  this current is reverses by Commutator when armature of DC motors  passes through magnetic neutral axis to maintain the unidirectional. Hence, commutator is used to change direct current into alternating current.


6 0
3 years ago
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