Physics
Fluid-Mechanics
Easy
Question
A metal cylinder of mass m and radius R1 moves down vertically in a pipe of radius R2 as shown 
is very small. There is a liquid between the cylinder and pipe whose coefficient of viscosity is 
. If the cylinder moves down with a constant velocity v, the value of is (length of the cylinder = L).
The correct answer is:
Related Questions to study
Physics
Capillary tubes of lengths l and 2l are connected in series. Their radii are r and 2r respectively. If stream line flow is maintained and pressure difference across first and second capillary tubes are 
respectively, then find the ratio 
.
Capillary tubes of lengths l and 2l are connected in series. Their radii are r and 2r respectively. If stream line flow is maintained and pressure difference across first and second capillary tubes are respectively, then find the ratio .
PhysicsFluid-Mechanics
Physics
16 cc. of water flows per second through a capillary tube of radius r and length l when connected to a pressure head of h cm of water. If a tube of the same length and radius r/2 is connected to the same pressure head, the quantity of water flowing through this tube per second will be
16 cc. of water flows per second through a capillary tube of radius r and length l when connected to a pressure head of h cm of water. If a tube of the same length and radius r/2 is connected to the same pressure head, the quantity of water flowing through this tube per second will be
PhysicsFluid-Mechanics
Physics
Two capillary tubes PQ and QR are joined at Q. PQ is 16cm long and has diameter 4 mm. QR is 4cm long and has diameter 2mm. The composite tube is held horizontally with the end P connected to a vessel of water giving a constant head of 10cm and the end R is open to atmosphere. The pressure difference across OR is
Two capillary tubes PQ and QR are joined at Q. PQ is 16cm long and has diameter 4 mm. QR is 4cm long and has diameter 2mm. The composite tube is held horizontally with the end P connected to a vessel of water giving a constant head of 10cm and the end R is open to atmosphere. The pressure difference across OR is
PhysicsFluid-Mechanics
Physics
A cubical block of wood of side a and density 
in floats in water of density 
The lower surface of the cube just touches the free end of a massless spring of force constant K fixed at the bottom of the Vessel.The weight W put over the block so that it is completely immersed in water without wetting the weight is
A cubical block of wood of side a and density in floats in water of density
The lower surface of the cube just touches the free end of a massless spring of force constant K fixed at the bottom of the Vessel.The weight W put over the block so that it is completely immersed in water without wetting the weight is
PhysicsFluid-Mechanics
Physics
A capillary tube of radius r and length l is connected in series with another capillary tube of radius 2 r and length l / 2. If the pressure across the two tubes taken together is P and a liquid flows through it, then the ratio of pressures across the first and second tubes is
A capillary tube of radius r and length l is connected in series with another capillary tube of radius 2 r and length l / 2. If the pressure across the two tubes taken together is P and a liquid flows through it, then the ratio of pressures across the first and second tubes is
PhysicsFluid-Mechanics
Physics
A capillary tube is fitted horizontally near the bottom to the wall of a vessel. If the experiment is conducted with water and a liquid by taking them upto the same level ratio of the rates of flow of water and the liquid is ( of liquid =0.002 Pas, its density =800 Kg m-3 of water =0.001 Pas, its density = 1000 Kg m-3)
A capillary tube is fitted horizontally near the bottom to the wall of a vessel. If the experiment is conducted with water and a liquid by taking them upto the same level ratio of the rates of flow of water and the liquid is ( of liquid =0.002 Pas, its density =800 Kg m-3 of water =0.001 Pas, its density = 1000 Kg m-3)
PhysicsFluid-Mechanics
Physics
The velocity of water in a river is 
at the surface. If the river is 2 m deep, the shearing stress between the horizontal layers of water assuming bottom layer at rest
( 
for water)
The velocity of water in a river is at the surface. If the river is 2 m deep, the shearing stress between the horizontal layers of water assuming bottom layer at rest
( for water)
PhysicsFluid-Mechanics
Physics
A solid cone of height H and base radius H/2 floats in a liquid of density 
It is hanging from the ceiling with the help of a string.The force by the fluidon the curved surface of the cone is(P0 = atmospheric pressure)
A solid cone of height H and base radius H/2 floats in a liquid of density It is hanging from the ceiling with the help of a string.The force by the fluidon the curved surface of the cone is(P0 = atmospheric pressure)
PhysicsFluid-Mechanics
Physics
A solid uniform ball of volume V floats on the interface of two immiscible liquids (see the figure).The specific gravity of the upper liquid is 
and that of lower one is 
, and the specific gravity of ball is 
The fraction of the volume of the ball in the upper liquid is
A solid uniform ball of volume V floats on the interface of two immiscible liquids (see the figure).The specific gravity of the upper liquid is and that of lower one is , and the specific gravity of ball is The fraction of the volume of the ball in the upper liquid is
PhysicsFluid-Mechanics
Physics
Work done in splitting a drop of water of 1 mm radius into 64 droplets is (Surface tension of water is 72 
10–3J/m2)
Work done in splitting a drop of water of 1 mm radius into 64 droplets is (Surface tension of water is 72 10–3J/m2)
PhysicsFluid-Mechanics
Physics
There is an air bubble of radius R inside a drop of water of radius 3R. Find the ratio of gauge pressure at point B to that at point A.
There is an air bubble of radius R inside a drop of water of radius 3R. Find the ratio of gauge pressure at point B to that at point A.
PhysicsFluid-Mechanics
Physics
A container has two immiscible liquids of densities 
and 
. A capillary tube of radius r is inserted in the liquid so that its bottom reaches up to the denser liquid. The denser liquid rises in the capillary and attains a height h from the interface of the liquids, which is equal to the column length of the lighter liquid. Assuming angle of contact to be zero, the surface tension of heavier liquid is
A container has two immiscible liquids of densities and . A capillary tube of radius r is inserted in the liquid so that its bottom reaches up to the denser liquid. The denser liquid rises in the capillary and attains a height h from the interface of the liquids, which is equal to the column length of the lighter liquid. Assuming angle of contact to be zero, the surface tension of heavier liquid is
PhysicsFluid-Mechanics
Physics
An open tank 10 m long and 2 m deep is filled up to 1.5 m height of oil of specific gravity 0.82. The tank is uniformly accelerated along its length from rest to a speed of 20 m/s horizontally. The shortest time in which the speed may be attained without spilling any oil is
An open tank 10 m long and 2 m deep is filled up to 1.5 m height of oil of specific gravity 0.82. The tank is uniformly accelerated along its length from rest to a speed of 20 m/s horizontally. The shortest time in which the speed may be attained without spilling any oil is
PhysicsFluid-Mechanics
Physics
An ideal fluid flows in the pipe as shown in the figure. The pressure in the fluid at the bottom 
is the same as it is at the top 
. If the velocity of the top 
. Then the ratio of areas 
is
An ideal fluid flows in the pipe as shown in the figure. The pressure in the fluid at the bottom is the same as it is at the top . If the velocity of the top . Then the ratio of areas is
PhysicsFluid-Mechanics
Physics
PhysicsFluid-Mechanics
