Advertisements
Advertisements
प्रश्न
A block of wood of volume 25 cm3 floats in water with 20 cm3 of its volume immersed in water.
Calculate:
(1) density of wood
(2) the weight of block of wood.
Advertisements
उत्तर
Volume of wooden block = V = 25 cm3
Volume of wooden block immersed in water = 20 cm3
Volume of water displaced by wooden block=volume of wooden
block immersed in water = 20 cm3
Density of water = ρwater = 1 gcm-3
Density of wooden block =ρwood = ?
By law of floatation:
volume of wooden block x Density of wood=Volume of water displaced x Density of water
`25 xx rho_"wood" = 20 xx 1`
`rho_"wood" = 20/25 = 0.8` g cm-3
Weight of wooden block `"V"rho_"wood""g"`
= 25 × 0.8 × g = 20 gf
APPEARS IN
संबंधित प्रश्न
A solid iron ball of mass 500 g is dropped in mercury contained in a beaker. (a) Will the ball float or sink? Give reasons. (b) What will be the apparent weight of the ball?
Why does a ship make of iron not sink in water, while an iron nail sinks in it?
A rubber ball floats in water with 2/7 of its volume above the surface of the water. Calculate the average relative density of the rubber ball.
State the principle of floatation. What can you say about the average density of a ship floating on water?
How does an object’s density determine whether the object will sink or float in water?
If you put one ice cube in a glass of water and another in a glass of alcohol, what would you observe? Explain your observations.
Why do petroleum-based products float on the surface of the water?
Hydrometer is based on the principle of ______.
Name different types of Hydrometers with their applications.
Describe the purpose, principle, and working of the Lactometer.
