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anonymous
 one year ago
sand is poured on a conical pile at a rate of 20 m^3/min. The height of the pile is always equal to the radius of the base of the pile. When the pile is 3m high, how fast is the height of the pile increasing?
anonymous
 one year ago
sand is poured on a conical pile at a rate of 20 m^3/min. The height of the pile is always equal to the radius of the base of the pile. When the pile is 3m high, how fast is the height of the pile increasing?

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imqwerty
 one year ago
Best ResponseYou've already chosen the best response.1dv/dt=20 m^3/minute we r given that radius=height, so radius=3=heoght :) Volume of cone=1/3(πr^2h) now Volume=1/3π9h dv/dt=1/3(9)dh/dt dv/dt=3dh/dt dv/dt=3dh/dt we know that dv/dt=20 so 20=3dh/dt dh/dt=20/3

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how did you get the now volume?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh it's radius sorry :))

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.1it is given in the question that height of pike is ALWAYS equal to radius of pile :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0why was the π gone in dv/dt=1/3(9)dh/dt? :)

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.1yea pi shuld also come sry

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0the answer should be 20/3π? :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh it's not in the choices :(

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0the choices are : 1.42, 0.71, 0.66 and 1.32

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.1something went wrng jst a min

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh it's supposed to be 20/9π :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1441469657321:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dv/dt = π(9) dh/dt then plug in 20 for dv/dt

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thank you guys for helping me :)
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