Chapter 13 – Fluid Mechanics
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A small sphere of radius r falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to:
29
Aug
A small sphere of radius r falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to: A small sphere of radius r falls from rest in a viscous liquid. As a result [...]
Two non-mixing liquids of densities ρ and nρ (n 1) are put in a container. The height of each liquid is h. A solid cylinder of length L and density d is put in this container. The cylinder floats with its axis vertical and length pL (p 1) in the denser liquid. The density d is equal to
29
Aug
Two non-mixing liquids of densities ρ and nρ (n 1) are put in a container. The height of each liquid is h. A solid cylinder of length L and density d is put in this container. The cylinder floats with its axis vertical and length pL (p 1) in the denser liquid. The density d [...]
The wettability of a surface by a liquid depends primarily on
29
Aug
The wettability of a surface by a liquid depends primarily on The wettability of a surface by a liquid depends primarily on August 29, 2020 Category: Chapter 13 - Fluid Mechanics , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions , Physics ,
A certain number of spherical drops of a liquid of radius ‘r’ coalesce to form a single drop of radius ‘R’ and volume ‘V’. If ‘T’ is the surface tension of the liquid, then:
29
Aug
A certain number of spherical drops of a liquid of radius ‘r’ coalesce to form a single drop of radius ‘R’ and volume ‘V’. If ‘T’ is the surface tension of the liquid, then: A certain number of spherical drops of a liquid of radius 'r' coalesce to form a single drop of radius 'R' [...]
Three liquids of densities p1,p2 and p3 (with p1 p2 p3) having the same value of surface tension T, rise to the same height in three identical capillaries The angles of contact θ1,θ2 and θ3 obey:-
29
Aug
Three liquids of densities p1,p2 and p3 (with p1 p2 p3) having the same value of surface tension T, rise to the same height in three identical capillaries The angles of contact θ1,θ2 and θ3 obey:- p2 and p3 (with p1 p2 p3) having the same value of surface tension T rise to the same [...]
A rectangular film of liquid is extended from (4 cm x 2 cm) to (5 cm x 4 cm). If the work done is 3 × 10^−4 J, the value of the surface tension of the liquid is
29
Aug
A rectangular film of liquid is extended from (4 cm x 2 cm) to (5 cm x 4 cm). If the work done is 3 × 10^−4 J, the value of the surface tension of the liquid is A rectangular film of liquid is extended from (4 cm x 2 cm) to (5 cm x [...]
A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 × 10^−2N/m. The pressure inside the bubble equals at a point Z0 below the free surface of water in a container. Taking g = 10 m/s^2, density of water = 103 kg/m^3, the value of Z0 is :
29
Aug
A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 × 10^−2N/m. The pressure inside the bubble equals at a point Z0 below the free surface of water in a container. Taking g = 10 m/s^2, density of water = 103 kg/m^3, the value of [...]
A small hole of an area of cross-section 2 mm^2 is present near the bottom of a fully filled open tank of height 2 m. Taking g = 10 m/s^2, the rate of flow of water through the open hole would be nearly.
29
Aug
A small hole of an area of cross-section 2 mm^2 is present near the bottom of a fully filled open tank of height 2 m. Taking g = 10 m/s^2, the rate of flow of water through the open hole would be nearly. A small hole of an area of cross-section 2 mm^2 is present [...]
A U tube with both end open to the atmosphere, is partially filled with water, Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see diagram). The density of the oil is:
29
Aug
A U tube with both end open to the atmosphere, is partially filled with water, Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see [...]
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A U tube with both end open to the atmosphere ,
A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m^2. Assuming that the pressure inside the house is atmospheric pressure ,
is partially filled with water ,
Oil ,
the force exerted by the wind on the roof and the direction of the force will be (ρair=1.2 kg/m^3) ,
which is immiscible with water ,
The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid through the holes is:
29
Aug
The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid through the holes is: each of radius r. If the speed of the liquid [...]