What is upthrust ?

Define upthrust and how is the upthrust experienced by a body affected if its volume is doubled keeping its mass constant?

For a body immersed in a liquid, when the weight of the body is less than the upthrust then the body will

A solid of mass 100 g and density 2 g cm^(-3) is immersed in water. Calculate the upthrust acting on it ?

A body weighs 500 gf in air and 450 gf when wholly iminersed in water. Calculate the upthrust of the body.

Assertion:- If barometer is acceleratated upwards, the level of mercury in the tube of barometer will decrease. Reason:- The effective value of g will increase, so upthrust increase.

A rocket consumes 24kg of fuel per second The burnt gases escape the rocket at a speed of 6.4km//s relative to the rocket Calculate the upthrust recevied by the rocket Also calculate the velocity acquired by the rocket when the mass redues to 1//100th of its initial mass.

A cylindrical body of area of cross section 100 cm^(2) and length 20 cm is immersed in a liquid whose density is 1.5 g cm^(-3) . If the density of the solid is 2 g cm^(-3) , calculate the upthrust acting on the body.

A solid ball is immersed in a liquid. The coefficient of volume expansion of ball and liquid are 3 xx 10^(-6) per/C and 9xx 10^(-6) per ,^(@) C respectively. Find the percentage change in upthrust when the temperature is increased by 25^(@)C