1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
inessss [21]
2 years ago
15

An electric motor is connected to a battery. The current flows through brushes to a commutator ring, which is attached to an ele

ctromagnet turning through a permanent magnetic field.
What is the purpose of the commutator ring?


It turns the electromagnet in the opposite direction.
It keeps the electromagnet from losing its magnetism.
It periodically reverses the current flow through the electromagnet.
It allows mechanical energy to be converted into electrical energy.
Physics
2 answers:
Shalnov [3]2 years ago
3 0
B.................................................
Dvinal [7]2 years ago
3 0
<span>It periodically reverses the current flow through the electromagnet.


</span>
You might be interested in
Convection currents produce the heat in the Earth’s interior.
DaniilM [7]

Answer:

False

Explanation:

Convection currents do not produce heat. In fact, convection current are a method of transfer of heat, not of production. Convection occurs when there is a fluid which is heated from bottom, from an external source of heat (such as a pot of boiling water over a flame): the bottom part of the fluid becomes warmer, and so less dense than the colder part, therefore it starts moving up, and it is replaced by the colder parts of the fluid, which go down. Later, these colder parts become warmer, so they start going up, being replaced by new colder parts, etc... in a cycle. This is known as convection current, but it requires an external source of heat, it does not produce heat by itself.

8 0
3 years ago
Read 2 more answers
find the resistance of a resistor connected to a 3v voltmeter and a 3A ammeter, resistance box along with cells of EMF 3V​
yarga [219]

Answer:

0

Explanation:

Emf E= V+ terminal V

3 = 3R + 3

R=0

5 0
3 years ago
A brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 N on him. The
uysha [10]

Answer:

f = 692 N

Explanation:

given data:

f =800N

a =1.2 m s^{2}

m= 90 kg

from newton's second law

net force F_{net} =\sum F = F_1 +F_2 +..... = ma

therefore we have from above equationF_{net} = F -f = ma

ma =F - f

putting all value to get force of friction

1.2*90 = 800 - f

f = 692 N

8 0
3 years ago
Mrs. Paul and Dr. Mykannen ride a tandem bike on the beach. They ride along the beach for about 455 meters. Their final velocity
algol [13]

Answer:

Time = 80.91 seconds

Explanation:

Given the following data;

Velocity = 5.50 m/s.

Distance = 445 meters

To find the time;

Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.

Mathematically, velocity is given by the equation;

Velocity = \frac{distance}{time}

Substituting into the formula, we have;

5.5 = 445/time

Time = 445/5.5

Time = 80.91 seconds

5 0
2 years ago
A 0.240 kg potato is tied to a string with length 1.90 m, and the other end of the string is tied to a rigid support. The potato
Luba_88 [7]

Explanation:

Below is an attachment containing the solution.

7 0
2 years ago
Read 2 more answers
Other questions:
  • Gravitational force is directly related to mass and inversely related to distance. So the bigger the masses the greater the forc
    10·1 answer
  • A child rides her bike at a rate of 12.0 km/hr down the street. A squirrel suddenly runs in front of her so she applies the brak
    10·1 answer
  • The wheel of a car has a radius of 0.413 m. If the wheel rotates at 456 revolutions per minute, what is the speed (in m/s) at wh
    11·2 answers
  • PLEASE HELP I WILL GIVE THE BRAINIEST TO WHOEVER ANSWERS!!!
    9·1 answer
  • What is meant by input and output work​
    7·1 answer
  • Assuming the average rate of heat energy flowing outwards from earth to be 0.063 W/m2 calculate the energy available at a hot sp
    6·1 answer
  • Help please
    14·1 answer
  • The form of energy stored in food is known as
    11·2 answers
  • Classify each of the following hydro carbons as alkane,alkene or alkyne
    13·1 answer
  • Place the following types of electromagnetic radiation in order from LOWEST energy
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!