Question

A wall is made of plastered material of 25cm thickness and followed by concrete of 5cm thickness Thermal conductivity of plastered material is 0.69w/mk and that of concrete is 0.93w/mk The temperatures of exposed surface is 30c and that of concrete is 5c Find out the heat loss through the wall of area 50m square

Answer 1

A water drop is observed to fall through a fluid of density 1 kg/m³ with a constant velocity of 9.8 m/s. What is the radius of the drop? Take the coefficient of viscosity of fluid as 0.000002 PI

The radius of the water drop will be,

r^2 = v x n x 9/rhogx2

=>r^2= 9.8 x 0.000002x9/1x9.8x2

=>r^2=0.000009

=>r= 3X10^-4 m

Radius of the droplet is 3X10^-4 m

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