What is gravitational wave

Gravitational wave 






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Black hole facts

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                                Black hole The closest black hole  t o earth is only 1.6000ly away  The singularity black hole has no volume hence it has infinite density  Information about what has fallen into a black hole is thought to store on event horizon If earth wear ti become a black hole it's diameter would be o.7 inch  White hole Black hole are extremely efficient if a car was as efficient black hole it could travel 1billion miles on 1 gallon of petrol The black hole at the center of our Galaxy is Sagittarius and 15 miles across The opposite of black hole is are estimated to be white hole which spray out matter  If you will fall in black hole you would be stretch like a spaghetti In 1972 tom Bolton discovered the first black hole is Cygnus x-1 Black hole Bigger black hole creat when black hole and galaxy collide If sun was replaced by black hol...
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Here's apparatus

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Hare,s apparatus It is used to measure the relative density of liquids. The of liquids. The liquids may or may not be miscible in water as they do not come in contact with each otherIt is consists of an inverted U-tube mounted on a vertical stand .It has an opening at the top end which is connected to a rubber tube with a pinch cock. The two arms of the tube are immersed inside two beaker one containing water and the other containing the liquids whose specific gravity is to be measured.Initially ,the level of the water and the liquid column in tube are measured .let them h1 and h2 respectively. The top surface of both liquid the U tube experience the same pressure 'p'. The pressure acting on the surface of liquid inside the beakers is atmosphere pressure ,p0.let d1 and d2 be density of water and liquid respectively . Therefore p0-h1d1g=p-->p0-p---------(1) P0-h2d2g=p---->h2d2g=p0-p------------(2) Therefore h1d1g=h2d2g h1/h2=d2/d1 Therefore therefore R.D=h1/h2...
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