Basic Maths and Units and DimensionsHard

Question

A ring is cut from a platinum tube 8.5 cm internal and 8.7 cm external diameter. It is supported horizontally from the pan of a ballance, so that it comes in contact with the water in a glass vessel. If an extra 3.97. If is requruired to pull it away from water, the surface tensi0on of water is

Options

A.72 dyne cm-1
B.70.80 dyne cm-1
C.63.35 dyne cm-1
D.60 dyne cm-1

Solution

(2πr1 + 2πr2) σ = mg
σ = 3.97 × 980
⇒ σ = 72 dyne cm-2

Create a free account to view solution

View Solution Free
Topic: Basic Maths and Units and Dimensions·Practice all Basic Maths and Units and Dimensions questions

More Basic Maths and Units and Dimensions Questions

String 1 is connected with string 2. The mass per unit length in string 1 is μ1 and the mass per unit length in str...If a unit vector is represented by then the value of ′α′ is :-...Consider a neutral conducting sphere. A positive point charge is placed outside the sphere. The net charge on the sphere...A sonometer wire is vibrating in the second overtone. In the wire there are...An ideal gas is initially at temperature T and volume V. Its volume is increased by ᐃV due to an increase in tempe...