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Dafna1 [17]
2 years ago
7

Which type of motor uses a brush and commutator to operate?

Physics
2 answers:
Andrew [12]2 years ago
6 0

Answer:

DC motor

Explanation:

DC motor is used to convert the electrical energy into the mechanical energy.

DC motor uses a brush and commutator to operate. The function of the commutator is to reverse the direction of electric current at every point. It also connects the power supply to the rotating coils with the help of brushes.

Brushes are used to carry current to the armature of the coil. Due to this, a magnetic field is created so that the motor runs. There are two brushes. One brush is connected to the switch and another brush is connected to the commutator.

Hence, a DC motor uses a brush and commutator to operate.

MissTica2 years ago
3 0
<span>DC motors generally use commutators. Also some single phase AC motors use</span>
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A ball is thrown up into the air with 100 j of kinetic energy, which is transformed to gravitational potential energy at the top
jenyasd209 [6]

The kinetic energy when it returns to its original height is 100 J

Solution:

The ball is thrown up with a Kinetic Energy K. E. = 0.5×m×v² = 100 J

Therefore the final height is given by

<u>u² = v² -2·g·s</u>

Where:

u = final velocity = 0

v = initial velocity

s = final height

Therefore v² = 2·g·s = 19.62·s

P.E = Potential Energy = m·g·s

Since v² = 2·g·s

Substituting the value of v² in the kinetic energy formula, we obtain

K. E. = 0.5×m×2·g·s = m·g·s = P.E. = 100 J

When the ball returns to the original height, we have

v² = u² + 2·g·s

Since u = 0 = initial velocity in this case we have

v² = 2·g·s and the Kinetic energy = 0.5·m·v²

Since m and s are the same then 0.5·m·v² = 100 J.

As the height of the ball increases the kinetic energy of the ball is converted into gravitational potential energy. This means that the kinetic energy of the bullet is reduced. When the ball reaches its maximum height, it momentarily comes to rest and the ball's kinetic energy is zero. When the ball hits the ground, its potential energy is converted to kinetic energy.

Learn more about Kinetic energy here:-brainly.com/question/25959744

#SPJ4

6 0
1 year ago
It is epistemically possible that a completed physics might include which of the following propositions? O Souls and other spiri
ohaa [14]

Answer:

option D.

Explanation:

The correct answer is option D.

At present the knowledge of physics does not includes the study related to souls , other spiritual substance.

Physics does not give the answers of question like God created universe , matter is unreal, etc.

So, there might will be possibility that in future complete physics will give the answer of all these questions i.e. correct answer is All of the above.

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3 years ago
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I'm pretty sure the answer is C. :)
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A woman launches a boat from one shore of a straight river and wants to land at the point directly on the opposite shore. If the
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Answer:

If she stands on the North side of a river flowing to the East at 5 mph,

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Your best bet is to go with D.

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