When electrons are moving we call it _______

Answers

Answer 1

Answer:

It *can* be called "Dynamic Electricity".

Hope that helps a little bit XD.

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A lamp can work on 50V mains taking 2 amps. What value of resistance must be connected in series with it, so that it can be operated from 200V mains giving the same power?

Answers

The resistance of the lamp is apparently 50V/2A = 25 ohms.

When the circuit is fed with more than 50V, we want to add
another resistor in series with the 25-ohm lamp so that the
current through the combination will be 2A.

In order for 200V to cause 2A of current, the total resistance
must be 200V/2A = 100 ohms.

The lamp provides 25 ohms, so we want to add another 75 ohms
in series with the lamp. Then the total resistance of the circuit is
(75 + 25) = 100 ohms, and the current is 200V/100 ohms = 2 Amps.

The power delivered by the 200V mains is (200V) x (2A) = 400 watts.

The lamp dissipates ( I² · R ) = (2² · 25 ohms) = 100 watts.

The extra resistor dissipates ( I² · R) = (2² · 75 ohms) = 300 watts.

Together, they add up to the 400 watts delivered by the mains.

CAUTION:
300 watts is an awful lot of power for a resistor to dissipate !
Those little striped jobbies can't do it.
It has to be a special 'power resistor'.
300 watts is even an unusually big power resistor.
If this story actually happened, it would be cheaper, easier,
and safer to get three more of the same kind of lamp, and
connect THOSE in series for 100 ohms. Then at least the
power would all be going to provide some light, and not just
wasted to heat the room with a big moose resistor that's too
hot to touch.

If an object moves in uniform circular motion in a circle of radius R = 1.0 meter, and the object takes 4.0 seconds to complete ten revolutions, calculate the centripetal acceleration.

Answers

Answer:

$a_c=246.5 (m)/(s^2)$

Explanation:

The formula for centripetal acceleration is:

$a_c=rw^2$

Where,

$r:$ radius.

$w:$ Angular speed.

Angular speed is defined by:

$w=(\Delta\theta)/(\Delta t)$

Where,

$\theta:$ position angle.

$t:$ time.

In this case we have that the object takes 4.0 seconds to complete ten revolutions.

You have to know that 1 revolution = $2\pi rad$ , then

10 revolutions= $10.2\pi rad = 20\pi rad$

Replacing

$\Delta\theta=20\pi rad\n\Delta t=4.0s$

in the formula of Angular speed:

$w=(\Delta\theta)/(\Delta t)\n\nw=(20\pi rad)/(4.0s)$

$w=5\pi (rad)/(s)\nw=15.7(rad)/(s)$

Now we have,

$a_c=rw^2\na_c=r(15.7(rad)/(s))^2$

r=1.0m

$a_c=1.0m(15.7(rad)/(s))^2\n\na_c=1.0(246.5)(m)/(s^2) \n\na_c=246.5(m)/(s^2)$

Then the centripetal acceleration is:

$a_c=246.5 (m)/(s^2)$

a = ω²r

r = 1 m
ω = 2πf = 2π * 10 / 4 = π*5 s⁻¹

Type of energy does a running refrigerator motor

Answers

Kinetic Energy..........
Hope it helped u!

kinetic energy is the only energy they run on

The sun generates both mechanical and electromagnetic waves. Which statement about those waves is true?The mechanical waves reach Earth, while the electromagnetic waves do not.

The electromagnetic waves reach Earth, while the mechanical waves do not.

Both the mechanical waves and the electromagnetic waves reach Earth.

Neither the mechanical waves nor the electromagnetic waves reach Earth.

Answers

Among the choices, the correct statement is: "The electromagnetic waves reach Earth, while the mechanical waves do not."

The sun's electromagnetic waves reach the Earth in the form of radiation. Mechanical waves cannot travel through vacuum. These two facts alone support the correct statement.

Answer:

The electromagnetic waves reach Earth, while the mechanical waves do not.

Explanation:

Sun's radiation that reaches the Earth belongs to the Infra red, Visible and the Ultraviolet range of frequencies of the electromagnetic spectrum. Sun's rays travel through vacuum before entering the earth's atmosphere.

These rays can travel through vacuum. The speed with which electromagnetic waves travel is the same as the speed of light .

The mechanical waves are the longitudinal and the transverse waves. They require a medium to travel. In the absence of a material medium they cannot travel. Material media are like air, water, oil, glass etc.

That's why even though both mechanical and electromagnetic waves are generated by the Sun, it is the electromagnetic waves that reach the earth.

The earth-moon relationship is unique in many ways. It is the largest moon in the solar system relative to its host planet. The relative size between the earth and moon are so close, some refer to it as a ________ planet system. binary host lunar

Answers

The earth-moon relationship is unique in many ways. It is the largest moon in the solar system relative to its host planet. The relative size between theearth and moon are so close, some refer to it as a binary planet system. As it is simply a a relationship between a planet and its moon, the system is called a binary system.

The relative size of earth and moon are a little bit of close in astronomical world.One can find unique relationship between two planetary systems i.e the earth and moon.

In astrophysics the term binary planet system refers to two planets.Here both the planets are of planetary masses.Two planetary bodies will be considered as the binary system if their sizes are proportional to each other and comparable.

Moon is the one satellite in the entire solar system which is larger than other satellites.The weight of the earth is 81 times more than the weight of earth and it is just 384000 km away from earth .Ideally it can not be considered as binary planet system.But it is considered as a binary planet system as their relative size are so close.

Hence the answer of this question is binary planet system.

two cylinders p and q are made of copper the height of p is twice the height of q . the diameter of p is half the diameter of q

Answers

Answer:

Explanation:

Cylinder P is taller than cylinder Q. In fact, it's twice as tall. So if cylinder Q is, let's say, 10 inches tall, cylinder P would be 20 inches tall.

Cylinder P is also wider, but not by a lot. It's only half as wide as cylinder Q. So if cylinder Q has a width of 10 inches, cylinder P would have a width of 5 inches.

Now, let's talk about the insides of these cylinders, how much stuff they can hold. If we filled them up with something, like water, the bigger one (cylinder P) can hold twice as much as the smaller one (cylinder Q).

So, cylinder P can hold more stuff because it's both taller and a little wider than cylinder Q.

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