- #1
- 3
- 0
A cylinder is full of water, a ball is sinking vertically along the central height the cylinder (ie the centre of the ball is along the central axis of the cylinder) with a constant speed V ,if the radius of the ball is r and the radius of the cylinder is R (r<R), find the volume of water displaced by the ball per unit time
the answer is "Volume displaced per unit time = pi*r^2*V''(area of a circle*V)
whereas I think it should be 2*pi*r^2*V ("area of a semi-spherical*V)
How to imagine this correctly?
Thanks very much for any hints!
the answer is "Volume displaced per unit time = pi*r^2*V''(area of a circle*V)
whereas I think it should be 2*pi*r^2*V ("area of a semi-spherical*V)
How to imagine this correctly?
Thanks very much for any hints!