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Doubt & Answer Explanation

Doubt

a spherical ball of radius 10 power(-4)m and density 10 power(4)kg per metre cube fall freely under gravity through a distance h before entering a tank of water.after entering the water,the velocity of ball does not change.find h.coefficient of viscosity of water is 9.8*(10 power(-6))newton per meter square per second.

Answer Explanation

It means that just before entering into the water tank the ball has achieved terminal velocity.






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