Archemedies Principle
Asked by
| 2nd Dec, 2009,
12:00: PM
The velocity of the ball just before entering the water = (2x9.8x19.6)1/2 = 19.6 m/s
Force of gravity = ρsVsg
Buoyancy force = ρwVsg
Net force = ρsVsg - ρwVsg = Vs(ρs-ρw)g = - 500x9.8xVs
Net acceleration = Net force/mass = - 500x9.8xVs/(500xVs) = -9.8 m/s2
The time required to bring the ball to rest in water = 0 - 19.6 m/s / -9.8 m/s2 = 2 sec
The depth it goes = 2(19.6) - 9.8x2x2/2 = 19.6 m.
It'll take 2+2 = 4 seconds to come again to the water surface after entry ino water.
Regards,
Team,
TopperLearning.
Answered by
| 2nd Dec, 2009,
01:34: PM
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