# Chapter 10 GRAVITATION

## How to convert the S I unit of Pressure and the C G S unit of Pressure?

Solution : S I unit of Pressure is Pascal ( Pa ) = N/m2 = ( kg m /s2 ) / m2 = kg m-1s-2 C G S unit of Pressure = Dyne/ cm2 = ( g cm /s2 ) / cm2 = g cm-1s-2 Method 1 1N = 105 dyne , 1m = 102 …

## Relative density of silver is 10.8. The density of water is 103 kg m–3 . What is the density of silver in SI unit ?

Solution:Relative density of silver = 10.8 Relative density = Density of silver / Density of waterThe density of silver = Relative density of silver × density of water = 10.8 × 103 kg m–3 Ans.

## Relative Density

, Definition The density of a substance is defined as mass of a unit volume. The unit of density is kilogram per metre cube (kg m–3).The density of a given substance, under specified conditions, remains the same.Therefore the density of a substance is one of its characteristic properties. It is different for different substances. For …

## Archimedes

Archimedes was a Greek scientist. He discovered the principle, subsequently named after him, after noticing that the water in a bathtub overflowed when he stepped into it. He ran through the streets shouting “Eureka!”, which means “I have got it”. This knowledge helped him to determine the purity of the gold in the crown made …

## Archimedes’ Principle

Archimedes’ principle, stated as follows:“When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it. “ The Archimedes law, which was developed by Archimedes of Syracuse in Greece, provides the thrust force value. When an object is submerged …

## BUOYANCY

The force due to the gravitational attraction of the earth acts on the bottle in a downward direction. So the bottle is pulled downwards. But the water exerts an upward force on the bottle. Thus, the bottle is pushed upwards. We have learnt that the weight of an object is the force due to the …

## PRESSURE IN FLUIDS

All liquids and gases are fluids. A solid exerts pressure on a surface due to its weight. fluids have weight, and they also exert pressure on the base and walls of the container in which they are enclosed. Pressure exerted in any confined mass of fluid is transmitted undiminished in all directions. Calculation of fluid …

## Thrust and Pressure

What is Thrust and Pressure ? A type of force that affects an object is thrust. There are numerous forces that an object may encounter. The effect of thrust per unit area on an object is known as pressure, and the force acting perpendicular to an object’s surface is known as thrust. An object will …

## An object weighs 10 N when measured on the surface of the earth. What would be its weight when measured on the surface of the moon?

Solution:We know,Weight of object on the moon = (1/6) × its weight on the earth.That is, Wm = We / 6 = 10/6 N = 1.67 N.Thus, the weight of object on the surface of the moon would be 1.67 N