1..a bucket of water is suspended from a spring balance .what is the increase in weight in the following cases;;;;
(1)when piece of stone suspended from a string is immersed in the water without touching the bucket?
(2)when piece of iron is put in the water in the bucket?
plz give reasons....
2....is viscosity independent of velocity gradient??????
1weight will increase in both cases due to bouyant force applied by stone on water (newton's third law !!!!!!)
11.(1)no change in reading as the weight of the stone does not come into play at all as the buoyant force and tension in string cancel it out
(2)weight as recorded by balance increases
2.yes it is independent.it's a property of the nature of the fluid.only the viscous force depends on velocity gradient
1can any expert verify whose explanation is correct , i think tension will reduce in the string
111) Why will the wt. change gr8 dreams? Even of the tension reduces,how will that affect the mass of the net quantity of water.....The stone won't have any effect as it's wt. will be balanced as arko said.
1@soumik
it will increase
becoz of reaction force !(reaction pair of bouyant force )
1for q2
viscosity(eta) is a property of fluid is doesnt depend on velocity gradient .the viscous force depends on it
and is given by the equation
F(viscous)=viscosity (eta) * vel.grad * Area of contact b/w layers
