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4 years ago

A windmill’s blades move from the blowing wind. The movement of the blades represents

Physics

2 answers:

levacccp [35]4 years ago

6 0

Kinetic energy

Explanation:

The windmill's blades moving by blowing wind represents kinetic energy.

Kinetic energy is the energy due to the motion of the particles of a medium. It is simply energy due to motion.

Energy is the ability to do work. It is of two types:

Kinetic energy
Potential energy

Potential energy is the energy at rest.

Wind energy is harnessed in moving the blades of a mill. An energy transformation from wind/tidal/wave energy to mechanical energy occurs here.

Wind,wave and tidal energy causes a disturbance in air particles which then transferred on the blades of the mill and it in turn rotates them.

The blades of the mill are carefully designed to provide the maximum rotation with little amount of disturbance on them.

When wave, wind and tidal energy collides with the blade, the potential energy of the blades initially at rest is transformed to kinetic energy in the motion by the rotating blades about a fixed axis. This is channeled to drive turbines in power stations where electricity is eventually produced.

The mechanical energy produced by the rotating mill is a form of kinetic energy. Both energy forms are due to motion of objects through which work can be done.

Learn more:

Kinetic energy brainly.com/question/6536722

#learnwithBrainly

Soloha48 [4]4 years ago

3 0

Answer:

Kinetic energy

Explanation:

The windmill’s blade was in a state of rest. Any object in a state of rest possesses potential energy which is given as mgh. The wind however blows and the blades move.

The wind helps in the conversion of the potential energy at rest to kinetic energy when in motion. The kinetic energy is given as 1/2* mass * the square of the velocity.

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1. When you have different masses for each sphere, how does the force that the larger mass sphere exerts on the smaller mass sph

aleksandrvk [35]

1) The forces are equal (Newton's third law of motion)

2) The force between the spheres will quadruple

3) The force of gravity exerted by the notebook on you is negligible

Explanation:

In this part of the problem, we want to compare the gravitational force exerted by the larger mass sphere on the smaller mass sphere to the force exerted by the smaller mass sphere to the larger mass sphere.

We can do this by using Newton's third law of motion, which states that:

"When an object A exerts a force (called action) on an object B, then object B exerts an equal and opposite force (called reaction) on object A"

In this problem, we can identify the larger mass sphere as object A and the smaller mass sphere as object B. This law tells us that the two forces are equal in magnitude and opposite in direction: therefore, the gravitational force exerted by the larger mass sphere on the smaller mass sphere is equal to the force exerted by the smaller mass sphere to the larger mass sphere.

The magnitude of the gravitational force between the two spheres is given by

$F=G\frac{m_1 m_2}{r^2}$

where

G is the gravitational constant

$m_1, m_2$ are the masses of the two spheres

r is the separation between the two spheres

In this problem, we are asked to find what happens when the distance between the spheres is halved, therefore when the new distance is

$r'=\frac{r}{2}$

Substituting into the equation, we find

$F'=G\frac{m_1 m_2}{r'^2}=G\frac{m_1 m_2}{(r/2)^2}=4(\frac{Gm_1 m_2}{r^2})=4F$

So, the force between the two spheres will quadruple.

We can give an estimate for the gravitational force exerted by your notebook on you.

As we said, the magnitude of the gravitational force is

$F=G\frac{m_1 m_2}{r^2}$

Where:

$G=6.67\cdot 10^{-11} m^3 kg^{-1}s^{-2}$ is the gravitational constant

Let's estimate the following:

$m_1 = 60 kg$ is your mass

$m_2 = 2 kg$ is the mass of the notebook

$r=1 m$ , assuming the notebook is at 1 metre from you

Substituting,

$F=(6.67\cdot 10^{-11})\frac{(60)(2)}{1^2}=8.0\cdot 10^{-9} N$

We see that this force has an extremely small value: therefore, it is almost negligible in daily life, where other much stronger forces act on you.

Learn more about gravity:

brainly.com/question/1724648

brainly.com/question/12785992

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8 0

3 years ago

Two spheres have the same radius and equal mass. One sphere is solid, and the other is hollow and made of a denser material. Whi

juin [17]

Answer:

Explanation:

Two sphere have same mass and radius but one is solid and another is hollow

Moment of inertia is the distribution of mass about the axis of rotation

For Hollow sphere more mass is at outside therefore its moment of inertia is more than solid sphere

$I_{hollow}=\frac{2}{3}mr^2$

$I_{solid}=\frac{2}{5}mr^2$

5 0

4 years ago

Pluto has a shape that is nearly round,and it orbits the sun,it has five known moons.why is it called a dwarf planet and not a p

s2008m [1.1K]

There are three things needed to be classified as a planet.

Pluto meets 2 of the 3.

The one it does not meet is it doesn’t “clear the neighborhood” which means a planet needs to be gravitationally dominant over all objects around it. Meaning smaller bodies ( asteroids) would either combine with the larger body making it bigger or pushing them away ( out of their orbit) so they do not collide with the larger body.

8 0

3 years ago

The equation that is used to solve second law problems is # F= ma.

maw [93]

F= Force
M=Mass
A= acceleration
F=N
Mass= in grams or kilo grams (mostly kg)
A= m/s

8 0

3 years ago

A ray of light crosses a boundary between two transparent materials. The medium the ray enters has a larger optical density. Whi

Tpy6a [65]

Answer:

The wavelength of the light decreases as it enters into the medium with the greater optical density.

The frequency of the light remains constant as it transitions between materials.

Explanation:

- When a ray of light crosses a boundary between two different materials, it undergoes refraction: the ray changes direction, and it also changes speed, according to the relationship:

$v=\frac{c}{n}$

where v is the speed of the ray of light in the material, c is the speed of light in a vacuum, n is the index of refraction of the material, which is larger for a medium with larger optical density. So, from the equation, we see that the larger the optical density, the smaller the speed of the wave.

- The frequency of the light does not depend on the properties of the medium, so it remains unchanged: therefore the statement

The frequency of the light remains constant as it transitions between materials.

is correct.

- Moreover, the wavelength of the ray of light is related to the speed and the frequency by the equation

$\lambda=\frac{v}{f}$

where v is the speed and f the frequency. Since we have seen that v decreases and f remains constant, this means that the wavelength decreases as well, so the statement

The wavelength of the light decreases as it enters into the medium with the greater optical density.

is also correct.

5 0

3 years ago