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Grade: 12
        
A water droplet starts falling from rest from a height h  and a quires the terminal speed just before reaching the ground. If g(acceleration due to gravity) is assumed to be constant and the radius of the drop is  r, find the work done by air drag. The density of air is  air ρair and the density of water pW
one year ago

Answers : (1)

harshin nechooli
121 Points
							
Hair loss in kinetic energy of the body will be the work done by the friction or fluid friction then you know that the final velocity of the body will be terminal velocity and initial energy of the body is MGH and the terminal velocity of the body is2rsq(pw-pa)÷9n.  then   1÷2 mvsq-mgh is work done by viscosity and you know that is costly is Resistance force and it will do and negative work it is clear from this expression
one year ago
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