Tuesday

September 2, 2014

September 2, 2014

Posted by **help** on Monday, February 20, 2012 at 10:24pm.

I got 3/pie, is that correct?

- Calculus -
**Reiny**, Monday, February 20, 2012 at 11:09pmI got 4/π

let the radius be r, then the height is 2r

V= (1/3)πr^2 h

= (1/3)πr^2(2r)

= (2/3)πr^3

dV/dt = 2π r^2 dr/dt

when 2r=.5

r = .25 and dV/dt = .25

1/4 = 2π(1/16) dr/dt

times 8

2 = π dr/dt

dr/dt = 2/π

d(2r)/dt = d(height)/dt = 4/π

- Calculus -
**help**, Tuesday, February 21, 2012 at 2:02amThank you!

**Answer this Question**

**Related Questions**

CALCULUS - Sand is being poured from a converyer belt forming a conical pile ...

AP Calculus - Sand pouring from a chute forms a conical pile whose height is ...

calculus - Sand falls from a conveyor belt at a rate of 20 m^3/min onto the top ...

calculus - grain is being poured through a chute at rate of 8 ft^3/min and forms...

calculus - please help if you can At a sand & gravel plant, sand is falling off ...

calculus - At a quarry, sand is filling off a conveyor onto a conical pile at a ...

math - San falls from a conveyor belt at the rate of 10 m^3/min onto the top of ...

12th grade - Wheat is falling from a chute onto a level floor at a rate of 8pi ...

Calculus - A storage tank used to hold sand is leaking. The sand forms a conical...

CALCULUS - A pile of sand in the shape of a cone whose base diameter is 4 times ...