Unit of thrust is _____________.

Instrument used to measure relative density

Heavy trucks are fitted with six to eight wheels, As area increases, Pressure will ___________.

An iron ball is weighed in air and then in water by a spring balance.

When a solid is partly or wholly immersed in a fluid, it experiences an apparent loss in ____________.

What is upthrust? State two factors on which the magnitude of buoyant force acting on an object immersed in liquid depends?

State Archimedes principle.

Why scuba divers always wear special protecting equipment?

The volume of 500g sealed packet is 300 cm³, Will the packet float or sink in water if the density of the water in 1g cm^-3? What will be mass of the water displaced by this packet?

A 60 kg girl wearing high heel shoes balances on a single heel. The heel is circular with a diameter of 1cm. What is the pressure exerted by the heel on the horizontal floor?

Name the instrument used to check the purity of milk. What is its principle? How does it work? where it is used?

a) A cube of side 5cm is immersed in water and then in saturated salt solution. In which case will it experience a greater buoyant force. If each side of the cube is reduced to 4cm and than immersed in water, what will be the effect on the buoyant force experienced by the cube as compared to the first case for water. Give reason for each case.
b) A ball weighing 4kg and density 4000 kg/m³ is completely immersed in water of density 103kg/m³. Find the force of buoyancy on it. (given g = 10ms^-2).