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Just a move a magnet on the mixture the iron filings will get attracted to it and hence can be separated out.

Motion:-A body is said be in a state of motion if it changes its position continuously with respect to its surroundings with the passage of time.E.g A bus running on a road, a flying bird etc

Rest:- A body is said to be at rest if it does not changes its position continuously with respect to its surroundings with the passage of time.Eg A book lying on a table.

Motionandrestare two different states of an object. ... So,motionandrestare relative to a closed frame. Considering the closed frame, an object is said to be atrestif it doesn't change its position at any given time. And,motionis when an object changes its position with respect to time within the closed frame.

If themirrorisbrokeninto twopieces, itsfocal lengthremains the same .Focal lengthchanges when there is change in the radius of curvature of themirror. ... If themirrorisbrokeninto twopieces, each part of themirrorwill act as an independentmirror. Thus eachbrokenpart will reflect its own image.

In anearthen pot,watergets evaporated quickly through the pores. Cooling is caused by evaporation. Some heat energy is utilised during the process of evaporation. Since this energy is taken from thewateritself, it leads to a lowering of temperature in the remaining amount ofwater.

Distance covered by train= 30 km = 30000 m

Time taken = 40 min = 40*60= 2400 s

Therefore,Velocity of train = Distance /time= 30000/2400= 300/24= 12.5 m/s

option B is the correct answer

B is the correct option

B is the right answer

B is the correct option

B is the correct answer

It is because thesoundproduced by the pendulum is of much lower frequency than that ofbee. thesoundproduced bybee'swing is continous where as thesoundproducer by the pendulum is just once or twice . thus thesoundfrom the pendulum by the timewe hear, vanishes in the air .

I=V/R v=potential difference or emf r = resistance of the circuit i= current of the circuit

The vibration produces sound which is modified into speech by the action of lips,tongue,teeth etc. Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate. Vibrations in air are called traveling longitudinal waves, which we can hear.

the simple answer is sound is made by vibration.when a body vibrate it make a sound.

Focal plane. : a plane that is perpendicular to the axis of a lens or mirror and passes through the focus.

It is widely accepted thatureais the first organic compound to be synthesized from inorganic chemicals. In 1828, the German chemist Friedrich Wöhler obtainedureaartificially by treating silver cyanate withammonium chlorid

If the atom has electrons in M shell then the k and L shell must have been fully filled. And as there are same number of electrons in the M shell as that there are in the K shell, so M shell has 2 electrons.Then total number of electrons is2+8+2=12Therefore the following atom is Magnesium.

Ans :- It iscalledso because it is applicable on all bodies having mass, and the bodies will be governed by the samelaw, that isnewton's law of gravitation. Thus, as it is applicableuniversally, it iscalledasuniversal law.

Newton’s universal law of gravitation states that every particle in the universe attracts every other particle with a force along a line joining them. The force is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

Statement of Universal Gravitation:The Law of Universal Gravitation states that every object of mass in the Universe attracts every other object of mass with a force which is directly proportional to the product of their masses and inversely proportional to the square of the separation between their centers.

The proportionalities expressed by Newton's universal law of gravitation are represented graphically by the following illustration. Observe how the force of gravity is directly proportional to the product of the two masses and inversely proportional to the square of the distance of separation.

Visible, infrared, gamma, radio waves, x-rays and microwave

gammax raysvisibleinfararedmicrowaveradiowave

gamma (<1)X-ray (1-10)visible (400-700)Infrared (700-10*5)microwave(10*5-10*8)radio wave (>10*8)

gamma X raysvisibleinfraredmicrowaveradiowave

for 1 ball

the impulse provided will be change in momentum = mu -(-mu) = 2mu

so F.t = 2mu F = 2mu/t = 2mu

now for n ball..the total value is 2mnu.

option B

The answer is Option 3.

Speed of sound depends primarily on thedensityand viscosity of the medium through which it propagates.

Sotemperature,humidity(ifnonliquid medium) andpressureare also factors as they impact thedensityand viscosity of the medium, especially if the sound wave propagates through fluids.

Speed, wavelength, and frequency of a sound wave are related by the following equation:

Speed = wavelength * frequencyWavelength = speed / frequencyWavelength = 344/120000 = 28.7 * 10 ^-4 m

1/2mv^2= mgh1/2*100*(10000)= 500*10*h50= 5000hh= 100m

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Thestrongestforce is the strong nuclearforce,and weakest force is gravitational force.

A very basic concept when dealing withforcesis the idea ofequilibriumor balance. ... If the size and direction of theforcesacting on an object are exactly balanced, then there is no netforceacting on the object and the object is said to be inequilibrium

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The Moon has no tangible atmosphere – at its surface, it is a near vacuum. Sound waves are pressure waves that propagate by vibrating the molecules of a medium, such as air or water. In a vacuum, there is nothing to vibrate, and thus no propagation.

When we speak, we are using our mouths to create vibrations in the air in our mouth. That air passes the vibration to the air just outside our mouth, which passes the vibration to the air next to it, and so on, until it reaches the air in our ears, which pass the vibration to our ear drums.

Electromagnetic waves can travel through the vacuum of space. They don’t need a medium other than space itself. So, astronauts on the Moon’s surface would talk to each other using radio.

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hence the maximum value and minimum value of the resultant forces it's 7N and 3N

the smallest fleece it's 4N hope this will help you like my answermark as best answer thank you

let smaller force is X and large force is Y then acc to sum X+Y=7....... (1) X-Y=3......... (2) there fore(1) +(2) =2X=10 X=5 so, small force is 5N option a is correct answer

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The smaller force will be equal to 2solution, :-let the larger force be A and smaller be Bnow,maximum resultant force =A+B=7...(1)And minimum resultant force =A-B=4...(2)adding both equations, we get, 2A=10A=5and smaller force B=7-AB=2hence smaller force =2

B is the smaller force

the frequency which is audible to the human ear is 20 kHZ

20 kHz means 20,000 Hertz

20kHz is answer of this question

The human range is commonly given as 20 to 20,000Hz.So option (b) 20 kHz is the right answer.

the frequency which is audible to the human ear is 20 KHZ

the answer is 20kHz to this question

lower in frequency than 20 Hzis called infrared sound. option (d)

Option Bas slew rate = 2πfknow2πfk should be less than Slew ratef should be less than Slew k= 2√2 Vassume gain = 1fmax= 0.5/10^-6*2*3.14*2*√2

= 28.13

1/20 = 0.05second 1/20000- 5 *10^ -5 secondas frequency= 1/time period