# physics

posted by
**khomotjo**
.

a homeowner wishes to drain her swimming pool by siphoning the water, whose depth is h, into a nearby gully a distance H below it,where H is much larger than h.she uses pipe of cross-sectional area a, and the pool has surface area A.how long does it take to empty the pool if h=2 m, H=20 m ,A=50 m2 ,a=5 cm2?