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1.) Mass = 100gm

volume = 10cm³

DENSITY = mass/volume

= 100/10

= 10 cm³

2.) Mass = 9kg = 9000gm

volume = 3m³ = 3000000cm³

Density = mass/volume

= 9000/3000000

= 0.003cm³

ong>Answer:

It is a basic postulate of the theory of relativity that the speed of light is constant. This can be broken down into two PARTS: The speed of light is independent of the MOTION of the observer. The speed of light does not VARY with TIME or place.

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Longitudinal waves are waves in which the displacement of the MEDIUM is in the same direction as, or the opposite direction to, the direction of propagation of the WAVE.

ong>ANSWER:

No, if The Net Force Acting On A Body Be Zero, then the body won't NECESSARILY be in the REST POSITION.

equivalent resistance between P & Q = 1.5 ohm

{resistance are in parallel}

so equivalent resistance between A&B = 14.5 ohm . { resistance are in series}

KINETIC ENERGY.......

ong>Answer:

1st equation of MOTION + 2nd equation of motion

= (RD equation of motion)(1+2)

= 3RD equation of motion

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Explanation:

SOLUTION is REFER to the ATTACHMENT !

________________________________

ong>Answer:

The different mountain TYPES are formed in different ways, through tectonic plates crunching into each other, or sliding past one another, or EVEN from MAGMA COMING up out of the Earth. ... The mountains are different in their APPEARANCE, and in their formation.

Explanation:

ONE HORSE POWER = 746 WATTS

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ong>Answer:

Here, MASS m=100kg,

density ρ=500kgm

−3

Volume of the BODY, V=

ρ

m

=

500

100

=0.2m

3

Weight of WATER displaced

=Vρg

=0.2×10

3

×g

=200gkgwt

Mass of water displaced =200kg

∴ the ADDITIONAL mass which can be added to body, so that body can sink

=200−100=100kg

p=F/A

p=1000/0.05

p= 2000 PA

ong>Answer:

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ong>Explanation:

The prevalent natural heat SOURCES in heat pumping applications are outdoor air, ground (soil or bedrock) and water (river, lake, SEA, ground water or waste water from industrial applications or SEWAGE). Waste heat in liquid (e.g. water) or GAS (e.g. air) flows could also be a valuable heat source for heat PUMPS.

No, it is not same because the FORMULA of these are DIFFERENT

ong>Answer:

3 = ( 1.08 / L )× X

l= ( 1.08× 216 × 10 ^-2 ) / 3 = 0.776 meter

{ l = length of POTENTIOMETER WIRE & x = 216 CM }

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it deviates DUE to change in DIRECTION

NANO METER is the answer

ong>Explanation:

Sound is produced when something vibrates. The vibrating BODY CAUSES the MEDIUM (water, air, etc.) around it to VIBRATE. Vibrations in the air are called travelling LONGITUDINAL waves, which we can hear.

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ong>Explanation:

Follow these STEPS to read the vernier scale:

Read the main scale. (Last whole increment visible before the 0 (ZERO) mark)

Read the secondary scale MEASUREMENT. (DIVISION that lines up best with a mark on the main scale.)

Add the TWO measurements together.

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the current will DECREASE as resistance is indirectly proportional to current in circuit. So more the resistance, LESS will be the current.

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ong>Answer:

Working of electrobell

An ELECTRIC bell has an electromagnet that pulls a strip of iron which makes the hammer hit the GONG to ring the bell.

• Step 1: When you push the switch of the bell, an electric CURRENT FLOWS to the electromagnet.
• Step 2: The electromagnet attracts the soft iron strip

a reaction in which a compound breaks down into TWO or more SIMPLER substances. The GENERAL form of a decomposition

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ong>Explanation:

Medium vacuum is vacuum that can be achieved with a single pump, but the pressure is too LOW to measure with a liquid or mechanical manometer. It can be measured with a MCLEOD gauge, thermal gauge or a capacitive gauge. ... British and German standards define ultra HIGH vacuum as pressures below 10−6 Pa (10−8 TORR).

0.02425.........

NUMBER of moles=MASS of a substance÷molar mass of a compound

=0.97/40=0.02425

W=FS

256=16s

256/16 =s

16m=s

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Explanation:

speed is not a vector quantity . it has only MAGNITUDE and no direction and hence it is a scalar quantity

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ong>ANSWER:

Charge on an electron is negative. The magnitude of the charge is 1.6 x 10–19 coulomb. A charge LESS than this VALUE cannot exist.

ong>ANSWER:

electric BELL

Explanation:

an ELECTRONIC bell is mechanical that function MEANS of electromegnet

ong>ANSWER:

Around 1900 low-thermal-expansion MATERIALS began to be used for PENDULUM rods in the highest PRECISION clocks and other instruments, first invar, a NICKEL steel alloy, and later fused quartz, which made temperature compensation trivial.

ong>Answer:

Watt-hour meter is in fact a measuring device which can evaluate and records the electrical power passing through a circuit in a certain time. By IMPLEMENTING the Watt-hour meter, we can KNOW how much amount of electrical ENERGY is used by a consumer or a residence or an electrically POWERED device or a business.

ong>Explanation:

ANGULAR SPEED =1.746 x 10-3 RAD/s

angular displacement of 20 minutes =2.095 rad, LINEAR speed = 8.73 x 10-5 m/s.

3.011×10^23 MOLECULES

ong>ANSWER:

Both the motions are different because the TIP of the second hand of a CLOCK performs uniform circular motion while the entire hard performs ROTATIONAL motion with the second hand as a rigid BODY.

ong>ANSWER:

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Mercury-in-glass THERMOMETER designed for measuring body temperature. There is a small BEND near the BULB to prevent mercury from falling back after the thermometer is taken out of the mouth.....

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ong>Answer:

(REF. IMAGE 1)

R  

AD

​  

=  

​  

=  

8+4

8×4

​  

=  

12

32

​  

=  

3

3

​  

Now,  (Ref. image 2)

R  

AB

​  

1

​  

=  

4

1

​  

+  

20

3

​  

=  

20

5+3

​  

R  

AB

​  

=  

8

20

​  

=  

4

10

​  

=2.5Ω

Explanation:

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