Flash Education

Question

A body weighs 20 gf in air and 18 gf in water. Calculate relative density of the material of the body.

Category: Upthrust in Fluids Archimedes' Principle and Floatation Class 9 ICSE

March 19, 2024

Answer

Weight of the solid in air (W₁) = 20 gf

Weight of the solid in water (W₂) = 18 gf

RD of body = $W_1\over W_1 - W_2$

= $20\over 20 - 18$ = $20\over 2$ = 10

Was this answer helpful?

Didn't liked the above answer ?

Text Generation Tool

💡 Some Related Questions

Upthrust in Fluids

A weather forecasting plastic balloon of volume 15 m³ contains hydrogen of density 0.09 kg m^-3. The volume of an equipment carried by the balloon is negligible compared to it’s own volume. The mass of the empty balloon alone is 7.15 kg. The balloon is floating in air of density 1.3 kg m^-3. Calculate : (i) the mass of hydrogen in the balloon, (ii) the mass of hydrogen and balloon, (iii) the total mass of hydrogen, balloon and equipment if the mass of equipment is x kg, (iv) the mass of air displaced by balloon and (v) the mass of equipment using the law of floatation.

Upthrust in Fluids

The density of ice is 0.92 g cm^-3 and that of sea water is 1.025 g cm^-3. Find the total volume of an iceberg which floats with it’s volume 800 cm³ above water.

Upthrust in Fluids

A wooden block floats in water with two-third of it’s volume submerged. (a) Calculate the density of wood. (b) When the same block is placed in oil, three-quarter of it’s volume is immersed in oil. Calculate the density of oil.

Upthrust in Fluids

A piece of wood of uniform cross section and height 15 cm floats vertically with it’s height 10 cm in water and 12 cm in spirit. Find the density of (i) wood and (ii) spirit.

Upthrust in Fluids

If the density of ice is 0.9 g cm^-3, what portion of an iceberg will remain below the surface of water in a sea? (Density of sea water = 1.1 g cm^-3)

Upthrust in Fluids

A piece of wax floats on brine. What fractions of it’s volume is immersed?
Density of wax = 0.95 g cm^-3,
Density of brine = 1.1 g cm^-3

Upthrust in Fluids

A wooden cube of side 10 cm has mass 700 g. What part of it remains above the water surface while floating vertically on the water surface?

Upthrust in Fluids

A block of wood of mass 24 kg floats on water. The volume of wood is 0.032 m³.
Find —
(a) the volume of block below the surface of water,
(b) the density of wood.
(Density of water = 1000 kg m^-3)

Upthrust in Fluids

A rubber ball floats on water with it’s 1/3^rd volume outside water. What is the density of rubber ?

Upthrust in Fluids

Explain the following: A ship submerges more as it sails from sea water to river water.

error: Content is protected !! 💀