Mechanical Properties of Fluids
A rain drop of radius 1.5mm, experience a drag force F=(12×10−5v)N, while falling through air from a height 2km, with a velocity v. The terminal velocity of the rain drop will be nearly (useg=10m/s2)
Two swimmers start a race. One who reaches the point C first on the other bank wins the race. A makes his strokes in a direction of 37o to the river flow with velocity 5 km/hr relative to water. B make his strokes in a direction 127o to the river flow with same relative velocity. River is flowing with speed of 2 km/hr and is 100 m wide. speeds of A and B on the ground are 8 km/hr and 6 km/hr respectively .
A lead shot of 1 mm diameter falls through a long column of glycerine. The variation of the velocity with distance covered (s) is correctly represented by
Water in a river 20m deep is flowing at a speed of 10ms−1. The shearing stress between the horizontal layers of water in the river in Nm−2 is :(coefficient of viscosity of water =10−3 SI units)
A square plate of 0.1 metre side moves parallel to a second plate with a velocity of 0.1 m/s,both plates being immersed in water. If the viscous force is 0.002 newton and the coefficient of viscosity is 0.01 poise,distance between the plates in metre is:
A rain drop of radius 0.3 mm falls through air with a terminal velocity of 1 m s−1. The viscosity of air is 18×10−5 poise. The viscous force on the rain drop is then