Upthrust

Match column I with column II and select the correct option from the given codes.

A small metallic piece weighs $50 \mathrm{g}$ and its volume is $20 {\mathrm{cm}}^3$. It is immersed in water. Calculate the

(a) the density of the metallic piece and

(b) upthrust on the metallic piece.

The apparent weight of a solid in a liquid is greater than that in air.

Two metal pieces when immersed in liquid experience equal upthrust on them, then :

A metal sphere is dipped in water. If at $0 °\mathrm{C}$& $4 °\mathrm{C}$ the buoyancies in water are ${\beta }_1$ and ${\beta }_2$ respectively, then :

A cubical object of side $2 \mathrm{m}$ and density $200 \mathrm{kg}/{\mathrm{m}}^3$ is floating on water. Calculate the depth of the body in meters that is immersed in water. Take density of water as $1000 \mathrm{kg}/{\mathrm{m}}^3$.

Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is $36 \mathrm{g}$ and its density is $9 \mathrm{g} {\mathrm{cm}}^{-3}$. If the mass of the other is $48 \mathrm{g}$, its density in $\mathrm{g} {\mathrm{cm}}^{-3}$ is

While floating the weight of the body is equal to the upthrust.

The center of _____ is the point where the total buoyant force or upthrust due to the fluid displaced by the immersed part of the body acts.

(mass / buoyancy)

Buoyant force exerted by different fluids on a given body is :

 What is upthrust? On its basis explain the principle of floatation.

The force that keeps an object floating in water.

Weight of a body increases after immersing into a liquid.

A ship sinks more deep while sailing in river water than seawater. Give reason.

Describe an activity to demonstrate that weight of a body immersed in a fluid reduces.

Define upthrust.  What should be the weight of a body compared to the upthrust if it floats or sinks?

Define upthrust. Lead has greater density than iron and both are denser than water. The buoyant force on lead is greater than or less than or equal to the iron of the same volume? Explain in detail and give more examples.

A ball weighing $4$ $\mathrm{kg}$ and having density $4000 \mathrm{kg}/{\mathrm{m}}^3$ is immersed in water having density ${10}^3 \mathrm{kg}/{\mathrm{m}}^3$. Find the force of buoyancy acting on it. $\left(\mathrm{g}=10 \mathrm{m}/{\mathrm{s}}^2\right)$.

A cube of side $4$ cm is immersed in water and then in saturated salt solution. In which case will it experience greater buoyant force? A student takes another cube of side $2$ cm and repeats the process. How will his observations change and why? What values of student are shown here?

An object is suspended with a string which gets stretched. When the object is completely immersed in water the extension in string decreases. Why?