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Yogita Ingle 6 years, 4 months ago
Stokes Law
- The force that retards a sphere moving through a viscous fluid is directly ∝to the velocity and the radius of the sphere, and the viscosity of the fluid.
- Mathematically:-F =6πηrv where
- Let retarding force F∝v where v =velocity of the sphere
- F ∝ r where r=radius of the sphere
- F∝η where η=coefficient of viscosity
- 6π=constant
- Stokes law is applicable only to laminar flow of liquids.It is not applicable to turbulent law.
- Let retarding force F∝v where v =velocity of the sphere
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Q : In increasing the area of the film of soap solution from 50cm^2to 100cm^2,3.0×10^-4J of work is done.calculate the value of surface tension of the soap
Answer:
Surface tension = work done / change in area
= 3*10-4/{(100-50)*10-4}
= 3/50 = 0.06 N/m
Posted by Princy Bhawra 6 years, 4 months ago
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Yogita Ingle 6 years, 4 months ago
L2 = 3R2
as MI of a solid cylinder about its own axis is ½ MR2
and MI about an axis passing through its centre of gravity and perpendicular to its length is
M(L2/12 + R2/4)
½ MR2 = M(L2/12 + R2/4)
R2/2 = L2/12 + R2/4
R2/2 – R2/4 = L2/12
L2 = 3R2
L1/2 = 31/2 R
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Yogita Ingle 6 years, 4 months ago
Elasticity is the capability of an object to return to its former shape once a load inducing strain is removed. If you were to drop a steel ball on a very hard surface, it would probably bounce higher than that of rubber. If you drop it on a softer surface, because it would deform less, then the surface it is to bounce off will be the one deforming, so the bounce would be a function of the elasticity of the floor, not of the ball.
A strand of silk is indeed stronger than a steel wire of the same diameter. The reason is that metal uses metallic bounds which is not as strong as the covalent bounds in a macro-molecule like the ones in silk. This also explains why Kevlar, carbon fiber, and carbon nanotubes are also stronger than steel.
Youngs Modulus of steel is more than youngs modulus of rubber.
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Yogita Ingle 6 years, 4 months ago
It states that the gravitational field outside a spherical shell having total mass M is the same as if the entire mass M is concentrated at its centre (centre of mass). And the gravitational field inside a spherical shell is zero.
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