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bii17
Group Title
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
 2 years ago
 2 years ago
bii17 Group Title
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
 2 years ago
 2 years ago

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bii17 Group TitleBest ResponseYou've already chosen the best response.1
hmm yes.. he formula is LA = pi*r*L
 2 years ago

Gowthaman Group TitleBest ResponseYou've already chosen the best response.0
1 inch per cubic minute .... means what ? i am not understanding ' CUBIC MINUTE'
 2 years ago

bii17 Group TitleBest ResponseYou've already chosen the best response.1
im sory it's 1 inch per minute
 2 years ago

Gowthaman Group TitleBest ResponseYou've already chosen the best response.0
LA = pi*r*L , and here L is slant height
 2 years ago

Gowthaman Group TitleBest ResponseYou've already chosen the best response.0
dw:1348992383404:dw
 2 years ago

bii17 Group TitleBest ResponseYou've already chosen the best response.1
what happn nxt?
 2 years ago

Gowthaman Group TitleBest ResponseYou've already chosen the best response.0
is it 1/ sqrt(2) inch/ min
 2 years ago

bii17 Group TitleBest ResponseYou've already chosen the best response.1
the answer will be 2.25 in per min @Gowthaman
 2 years ago

Gowthaman Group TitleBest ResponseYou've already chosen the best response.0
then somewhere i missed, i check once again
 2 years ago

Gowthaman Group TitleBest ResponseYou've already chosen the best response.0
but now i got .25 inch/min
 2 years ago

Gowthaman Group TitleBest 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
 2 years ago

Gowthaman Group TitleBest ResponseYou've already chosen the best response.0
@bii17 ....?
 2 years ago

sauravshakya Group TitleBest ResponseYou've already chosen the best response.2
dw:1348995046484:dwdw:1348995119250:dwdw:1348995143495:dw
 2 years ago

sauravshakya Group TitleBest ResponseYou've already chosen the best response.2
dw:1348995200114:dw
 2 years ago

sauravshakya Group TitleBest ResponseYou've already chosen the best response.2
I hope u can solve it from here...
 2 years ago

bii17 Group TitleBest ResponseYou've already chosen the best response.1
@sauravshakya hey stil there?
 2 years ago

bii17 Group TitleBest ResponseYou've already chosen the best response.1
dw:1349001368987:dw
 2 years ago

bii17 Group TitleBest ResponseYou've already chosen the best response.1
@sauravshakya what is that?? i didnt understand those with circle..
 2 years ago

sauravshakya Group TitleBest ResponseYou've already chosen the best response.2
That is radius of the cone
 2 years ago

sauravshakya Group TitleBest ResponseYou've already chosen the best response.2
Got it?
 2 years ago

sauravshakya Group TitleBest ResponseYou've already chosen the best response.2
ALSO,dw:1349001642850:dw
 2 years ago

bii17 Group TitleBest ResponseYou've already chosen the best response.1
@hartnn can u help me in this question?
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
which part of saurav's explanation did u not understand?
 2 years ago

bii17 Group TitleBest 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
 2 years ago

hartnn Group TitleBest 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
 2 years ago

bii17 Group TitleBest ResponseYou've already chosen the best response.1
dw:1349002789725:dw i get is 8 @hartnn
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
oh sorry, dr/dt = 1/2 and not 2
 2 years ago

bii17 Group TitleBest ResponseYou've already chosen the best response.1
dw:1349002976588:dw my answer is 2.. :( @hartnn can u show me what u did?
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
dw:1349002984911:dw
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
did u get that u missed the *minus* sign in the beginning ?
 2 years ago
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