Advertisements
Advertisements
प्रश्न
Calculate the mass of air in a room of dimensions 4.5 m × 3.5 m × 2.5 m if the density of air at N.T.P. is 1.3 kgm-3 .
Advertisements
उत्तर
Volume of air = `4.5 xx 3.5 xx 2.5` m3
Density pf air at NTP = 1.3 kgm3
Mass of air = Density × volume
Or Mass = (1.3) × (4.5 × 3.5 × 2.5) = 51.19 kg
APPEARS IN
संबंधित प्रश्न
A body held completely immersed inside a liquid experiences two forces:
(i) F1, the force due to gravity and
(ii) F2, the buoyant force.
Draw a diagram showing the direction of these forces acting on the body and state the condition when the body will float or sink.
A bunch of feathers and a stone of the same mass are released simultaneously in air. Which will fall faster and why? How will your observation be different if they are released simultaneously in vacuum?
A body of density ρ sinks in a liquid of density ρL. The densities ρ and ρL are related as :
How does the density ρs of a substance determine whether a solid piece of that substance will float or sink in a given liquid ρL?
A block of wood of mass 24 kg floats on water. The volume of wood is 0.032 m3. Find:
- the volume of block below the surface of water,
- the density of wood.
(Density of water = 1000 kg m−3)
A piece of wood of uniform cross section and height 15 cm floats vertically with its height 10 cm in water and 12 cm in spirit. Find the densities of wood and spirit.
A cork cut in the form of a cylinder floats in alcohol of density 0.8 gcm-3, such that 3/4 of its length is outside alcohol. If the total length of the cylinder is 35 cm and area of cross-section 25 cm2, calculate:
(1) density of cork
(2) wt. of cork
(3) extra force required to submerge it in alcohol
A body of mass ‘m’ is floating in a liquid of density ‘p’
what is the loss of weight of body?
A wooden cube of side 10 cm has a mass of 700 g. It will float in the water with:
(a) Half of its volume inside the water
(b) 3 cm height above the water surface
(c) 7 cm height above the water surface
(d) Just inside the water surface.
