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4 years ago

What is an electric motor? Explain its operation.

2 answers:

7 0

An electric motor is an electrical machine that converts electrical energy into mechanical energy.

Electric motors work on the principal of the interaction between magnetic field electr-magnetism. A loop which is carrying the current is placed in a magnetic field. The loop will experience a torque. The torque starts rotating the coil and the propellers start to rotate when the current passes through the loop.

qwelly [4]4 years ago

4 0

Answer:

(Straight out of Physics textbook)

Explanation:

An electric motor is a slightly modified galvanometer. An electric motor current changes direction every time the coil makes a half revolution. Electric motors have greatly impacted the way of life. It made it possible to replace enormous human and animal toil by electric power all over the world.

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Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. Which of the following best

Marizza181 [45]

As we know that in cellular phone all the signals are transmitted by antenna in the form of electromagnetic waves

All these electromagnetic waves are transmitted through the phones and then received as a signal to the receiver of another phone

These signals are then processed and converted into sound which is produced by the phone

So here correct answer will be

C. The cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound.

7 0

3 years ago

Read 2 more answers

A hydraulic arrangement consists of a water-filled u-tube that is wider on one end than on the other. pistons are fitted in both

kow [346]

A hydraulic arrangement consists of a water- filled U-tube that is wider on one end than on the other. Pistons are fitted in both ends.

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3 years ago

A Decay Chain

Strike441 [17]

Answer : The energy released in first step of thorium-232 decay chain is $7.974\times 10^{-13}J$

Explanation :

First we have to calculate the mass defect $(\Delta m)$ .

The balanced reaction is,

$^{232}Th\rightarrow ^{228}Ra+^{4}He$

Mass defect = Sum of mass of product - sum of mass of reactants

$\Delta m=(\text{Mass of Ra}+\text{Mass of He})-(\text{Mass of Th})$

$\Delta m=(228.0301069+4.002602)-(232.038054)=5.34\times 10^{-3}amu=8.86\times 10^{-30}kg$

conversion used : $(1amu=1.66\times 10^{-27}kg)$

Now we have to calculate the energy released.

$Energy=\Delta m\times (c)^2$

$Energy=(8.86\times 10^{-30}kg)\times (3\times 10^8m/s)^2$

$Energy=7.974\times 10^{-13}J$

The energy released is $7.974\times 10^{-13}J$

Therefore, the energy released in first step of thorium-232 decay chain is $7.974\times 10^{-13}J$

7 0

3 years ago

A 70 kg object is on a table in static equilibrium. What is the support (normal) force the table exerts on the box

sweet-ann [11.9K]

F(n) = mg = 70 x 9.8 = 68.6 N

3 0

4 years ago

1. Which of the following statements describes a physical property?

Rama09 [41]

Physical property is a property that is measurable whose value describes a state of physical property

8 0

3 years ago