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ong>Answer:

An electric MOTOR works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously. It is based on Fleming's left hand RULE. (c ) (i) Armature . It is the rotating part of a motor.

⟹ Principle of WORKING of electric motor: A coil carrying electric current placed in an EXTERNAL magnetic field experiences a force.

⟹ Function of armature: Enhances the power of the motor and induces motion.

⟹ Function of BRUSHES: Helps easy transfer of charge between the coil and the external circuit.

⟹ Function of split rings: Reverses the direction of current after each half rotation of the coil so that the coil can keep rotating continuously.

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Explanation:

>

Answer Expert Verified

FORCE is a PUSH or a pull acting on an object which changes or TENDS to change state of rest or MOTION of an object. ... Force can produce following Changes when acts on an object: 1. Force can change the state of rest or motion of an object.

ong>ANSWER:

SI UNIT is used for SIMPLE quantity like time=second; length=meter they only have derived unit is more complex because you multiply or divide at least two basic SI MAKING it have more than one unit.....

AND THE ABOVE PICTURE HELPS YOU TO UNDERSTAND EASILY

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ong>Answer:

An electromagnet is a type of magnet in which the magnetic FIELD is produced by an electric current. Electromagnets usually CONSIST of wire wound into a COIL. A current through the wire creates a magnetic field which is CONCENTRATED in the hole, denoting the CENTRE of the coil.

Explanation:

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nabhikiya............ OK

you know , q STANDS for charge and e stands for charge on an electron . As for N , it REPRESENTS an INTEGER. q=ne. Hence the formula .

>Answer:-

• Given:-

Temperature [T] = 300 K

Mass of He atom = 4u

Boltzmann constant [kB] = 1.38 × 10-²³ J/K

• Solution:-

where,

here,

kB = Boltzmann constant

T = Temperature

M = Molar mass

m = mass of GAS in kg

R = Universal Gas constant

Hence,

Taking:-

R = 8.314472 J/mol. K

T = 300 K

Mm = 4.0026 × 10-³ kg/mol.

→

→

→

→

→

THEREFORE, the rms speed of He is 1367.311595 ≈ 1368 m/s.

ong>ANSWER:

When capacitors or inductors are involved in an AC CIRCUIT, the current and voltage do not peak at the same time. The fraction of a period difference between the peaks expressed in DEGREES is said to be the phase difference. It is CUSTOMARY to use the angle by which the voltage leads the current. ...

Explanation:

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The PRESENCE of starch in leaves can be tested by the Iodine TEST. When we remove CHLOROPHYLL from the leaf by boiling it in alcohol and then put two DROPS of iodine solution, it is colour change to blue indicates the presence of starch

t KNOW bhai

Explanation:

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ong>ANSWER:

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heat released to COOL 500G water from 20

∘

C to 0

∘

C.

q=msΔT

=500×4.18×20=41800J

=41.8kJ

Number of moles of water(ice) that will MELT to absorb 41.8kJ=

6.02

41.8

=≈7.

ong>Answer:

Guide WAVELENGTH is defined as the distance between two EQUAL PHASE planes along the waveguide. The guide wavelength is a function of operating wavelength (or frequency) and the LOWER cutoff wavelength, and is ALWAYS longer than the wavelength would be in free-space.

ong>Answer:

Work = Force * DISTANCE

(I’m using an asterisk to denote multiplication)

Force (in NEWTONS) EXERTED by a MASS m is: F = m * g

(assuming we are on Earth, that is)

where g is the acceleration due to GRAVITY, 9.81 m/s/s

Therefore Work = Mass * g * Distance

= 10 * 9.81 * 5

=490.5 Joules

ong>EXPLANATION:

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ong>Answer:

Newton's first law states that a body STAYS at rest if it is at rest and MOVES with a constant VELOCITY unit if a net FORCE is applied on it.

or

An object at rest will remain at rest unless acted upon by an external and unbalanced force. An object in motion will remain in motion unless acted upon by an external and unbalanced force.The first law gives the qualitative explanation of force.

it doesn't have that type any numerical application

Newton's second law states that the net force applied on the body is equal to the rate of change in its momentum.

F = ma

a(acceleration) = v-u/t

or F = m(v-u) / t

or Ft = mv - mu

That is, when F = 0, v = u for whatever time, t is TAKEN. This means that the object will continue moving with uniform velocity, u throughout the time, t. If u is zero than v will also be zero, i.e., object will remain at rest.

derivation of three equations of motion :

Here is your answer........!!

(1) First equation of Motion:

V = u + at

soln.

Consider a body of mass “m” having initial velocity “u”.Let after time “t” its final velocity becomes “v” due to uniform acceleration “a”.

Now we know that:

Acceleration = change in velocity/Time taken

=> Acceleration = Final velocity-Initial velocity / time taken

=> a = v-u /t

=>at = v-u

or v = u + at

This is the first equation of motion.

—————————————-

(2) Second equation of motion:

s = ut + 1/2 at^2

sol.

Let the distance travelled by the body be “s”.

We know that

Distance = Average velocity X Time

Also, Average velocity = (u+v)/2

.: Distance (t) = (u+v)/2 X t …….eq.(1)

Again we know that:

v = u + at

substituting this value of “v” in eq.(2), we get

s = (u+u+at)/2 x t

=>s = (2u+at)/2 X t

=>s = (2ut+at^2)/2

=>s = 2ut/2 + at^2/2

or s = ut +1/2 at^2

This is the 2nd equation of motion.

……………………………………………………………

(3) Third equation of Motion

v^2 = u^2 +2as

sol.

We know that

V = u + at

=> v-u = at

or t = (v-u)/a ………..eq.(3)

Also we know that

Distance = average velocity X Time

.: s = [(v+u)/2] X [(v-u)/a]

=> s = (v^2 – u^2)/2a

=>2as = v^2 – u^2

or v^2 = u^2 + 2as

This is the third equation of motion.

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Explanation:

ong>ANSWER:

SENSE INERTIA is a measure of mass

So RATIO is 1:3 or 3:1

the answer is 1 as 1/100*100 is 1

Example-Turning a WATER TAP.

The SIGN is appostropi.

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ong>EXPLANATION:

HERE U GO...

JUST FOLLOW THE VECTOR SIMPLE ADDITION FORMULA

ong>Explanation:

So just for example, if a ball is THROWN vertically upwards with 98 m/s VELOCITY, then to REACH the maximum height it will take = 98/9.8 =10 SECONDS.

ong>ANSWER:

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ong>ANSWER:

i4r075ri5 has been a BOX MANAGER for credit CARDS since the meeting kar was appointed to apne 7

(1) A-B

Velocity is Displacement/time interval=(3−0)/(5−2)=1m/s

(2) B-C

Displacement is zero because at B and at C the value of displacement is 3 so no change in displacement so no velocity so velocity is zero.

(3) C-D

Velocity=(0−3)/(10−7)=−1m/s

Explanation:

Displacement time GRAPH is in the picture

ong>Answer:

The principle of CONSERVATION of momentum states that if TWO objects collide, then the TOTAL momentum before and after the collision will be the same if there is no external force ACTING on the colliding objects.

U subdjebubUwbjqnIninobqzubxneixbeniebxxineienxrnxinrkxnrj

the ANSWER is in the above PICTURE

ong>Answer:

Yes! Here is your answer!

Explanation:

Unit PREFIX M (mega), meaning one million times, and m (milli) meaning one-thousandth. m is the standard abbreviation for metre (or meter) in the International System of UNITS (SI). However, m is also USED as an abbreviation for mile. ... With money amounts, m MEANS one million: $5m is FIVE million dollars.

ong>ANSWER:

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Momentum as a CONSERVED measure of motion

With the approach we've adopted so far, there SEEMS nothing very fundamental about the quantity – it just so happens that mass × velocity is a useful measure of motion – one that you can CHANGE by the ACCUMULATED action of a force acting on the object over time.

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because it has lots of FREE electrons which CARRY carries heat more frequently

also because it has low RESISTIVITY it transfers heat well

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GRAM is the answer to the QUESTION

It is RELATED as above.

time

Explanation:

speed is a SCALER QUANTITY

Answer is S , because it is DIFFERENT from other

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ong>Answer:

A head SHOT or headshot is a modern (usually digital) portrait in which the focus is on the person. The TERM is applied usually for professional PROFILE images on social media, images used on online dating profiles, the 'about us page' or a CORPORATE WEBSITE and promotional pictures of actors, models, and authors.

ersion of LIGHT: The splitting of white light into seven colours on passing through a transparent medium is called DISPERSION of light. The dispersion of white light happens because the angle of refraction of lights of different colours is different while passing through the transparent medium.

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they are MAGNETIC in nature.......HOPE it helps......MARK me as brainliest

Explanation:

Energy exists in many different FORMS. Examples of these are: light energy, heat energy, mechanical energy, gravitational energy, ELECTRICAL energy, sound energy, CHEMICAL energy, nuclear or ATOMIC energy and so on.

ong>ANSWER:

A metric system of units based on the CENTIMETRE, GRAM, and SECOND.

ong>Answer:

Choose correct answer:

1.Bhirrana/Kalibangan has emerged as the OLDEST indus site.

2.The drains/streets cut each other at RIGHT angles.

3.Most of the seals were MADE of terracotta/bitumen.

4.Many/No temples have been found in the indus cities.

5.The indus people traded with Mesopotamina/Greece.

6.The indus people used Roman/pictographic SCRIPT.

ong>ANSWER:

a) minimum wavelength

it helps in listening ultrasound waves

a) infrared waves - it is useful in COMMUNICATION.

B) MICROWAVES - radio astronomy ,medical treatment

these are the two waves USES.

en:

A BALL is thrown at 20.0 m s−1 at an ANGLE 20.0° above the horizontal.

To find:

Instantaneous velocity of the ball at the highest point.

Calculation:

This question is based on ground to ground PROJECTILE.

We know that at the highest point of a projectile the instantaneous velocity of an object is equal to the x-axis component of the initial velocity.

So, final ANSWER is: