CBSE Class 12-science Answered
water is dripping out from a conical funnel at a uniform rate of 4cm cubic/sec through a tiny hole at the vertex in the bottom.when the slant height of the water is 3cm ,find the rate of the decrease of the slant height of the water,given that the vertical angle of the funnel is 120
Asked by RajeshMudgal | 09 Jan, 2013, 07:08: PM
Expert Answer
rate of dripping of water from conical funnel=dv/dt=4c.m cubic/sec
volume of water v=1/3pi r^2h
also sin60=r/l
r=(root3)/2*l
cos60=h/l
h=l/2
using in volume
v=(1/3)*pi*3/4*l^2*l/2
=(1/8)*pi*l^3
diff. w. r. to t
dv/dt=(1/8)*pi*3(l^2)(dl/dt)
atl=3, dv/dt=4
so dl/dt=(4*8)/27pi
= 32/(27pi) c.m./sec
Answered by | 10 Jan, 2013, 02:59: PM
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