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The base diameter and altitude of a right circulAR cone are observed at a certain instant to be 10 and 20 inches respectively. if the lateral area is constant and the base diameter is increasing at a rate of 1 inch per cubic minute, find the rate at ehich the altitude is decreasing
 one year ago
 one year ago
The base diameter and altitude of a right circulAR cone are observed at a certain instant to be 10 and 20 inches respectively. if the lateral area is constant and the base diameter is increasing at a rate of 1 inch per cubic minute, find the rate at ehich the altitude is decreasing
 one year ago
 one year ago

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bii17Best ResponseYou've already chosen the best response.1
hmm yes.. he formula is LA = pi*r*L
 one year ago

GowthamanBest ResponseYou've already chosen the best response.0
1 inch per cubic minute .... means what ? i am not understanding ' CUBIC MINUTE'
 one year ago

bii17Best ResponseYou've already chosen the best response.1
im sory it's 1 inch per minute
 one year ago

GowthamanBest ResponseYou've already chosen the best response.0
LA = pi*r*L , and here L is slant height
 one year ago

GowthamanBest ResponseYou've already chosen the best response.0
dw:1348992383404:dw
 one year ago

GowthamanBest ResponseYou've already chosen the best response.0
is it 1/ sqrt(2) inch/ min
 one year ago

bii17Best ResponseYou've already chosen the best response.1
the answer will be 2.25 in per min @Gowthaman
 one year ago

GowthamanBest ResponseYou've already chosen the best response.0
then somewhere i missed, i check once again
 one year ago

GowthamanBest ResponseYou've already chosen the best response.0
but now i got .25 inch/min
 one year ago

GowthamanBest ResponseYou've already chosen the best response.0
dh/dr =1/2 (from condition of constant LS area) and dr/dt = 1/2 inch/min (given in the problem) dh/dt = dh/dr x dr/dt =  1/2 x 1/2 =  1/4 = 0.25 inch / min
 one year ago

sauravshakyaBest ResponseYou've already chosen the best response.2
dw:1348995046484:dwdw:1348995119250:dwdw:1348995143495:dw
 one year ago

sauravshakyaBest ResponseYou've already chosen the best response.2
dw:1348995200114:dw
 one year ago

sauravshakyaBest ResponseYou've already chosen the best response.2
I hope u can solve it from here...
 one year ago

bii17Best ResponseYou've already chosen the best response.1
@sauravshakya hey stil there?
 one year ago

bii17Best ResponseYou've already chosen the best response.1
@sauravshakya what is that?? i didnt understand those with circle..
 one year ago

sauravshakyaBest ResponseYou've already chosen the best response.2
That is radius of the cone
 one year ago

sauravshakyaBest ResponseYou've already chosen the best response.2
ALSO,dw:1349001642850:dw
 one year ago

bii17Best ResponseYou've already chosen the best response.1
@hartnn can u help me in this question?
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
which part of saurav's explanation did u not understand?
 one year ago

bii17Best ResponseYou've already chosen the best response.1
here.. dw:1349002226151:dw i used it but i didnt get the correct answer the answer should be 2.25 @hartnn
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
@bii17 i did get it as 2.25. l^2=425, r=5, h=20, dr/dt=2
 one year ago

bii17Best ResponseYou've already chosen the best response.1
dw:1349002789725:dw i get is 8 @hartnn
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
oh sorry, dr/dt = 1/2 and not 2
 one year ago

bii17Best ResponseYou've already chosen the best response.1
dw:1349002976588:dw my answer is 2.. :( @hartnn can u show me what u did?
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
did u get that u missed the *minus* sign in the beginning ?
 one year ago
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