Wednesday

April 1, 2015

April 1, 2015

Posted by **edward** on Saturday, November 24, 2012 at 4:07am.

- maths -
**Steve**, Saturday, November 24, 2012 at 4:55amassuming it had zero area at t=0,

a = pi r^2

da/dt = 2pi r dr/dt

2 = 2pi (28/11) dr/dt

11/(28pi) = dr/dt

- maths -
**edward**, Saturday, November 24, 2012 at 7:12ami tried this way but answer not coming..... :/

ans is 0.25

- maths -
**Steve**, Saturday, November 24, 2012 at 10:39amnope. I don't buy it. I think the answer lost a factor of 2 somewhere. 11/(28pi) is 0.125

**Answer this Question**

**Related Questions**

maths - A circular ink blot grows at the rate of 2 cm per sec. Find the rate at ...

maths - The radius of a blot ink is increasing at a rate of 1.55mm per seconds....

math - Air is pumped into a balloon such that its volume increases at the rate ...

math - Can you give me step by step instruction on how to solve this problem ...

math - suppose that oil spilled from a tanker and spreads in a circular pattern ...

Calculus - A water tank in the shape of a right circular cylinder has a volume ...

Calc - The radius of a sphere is increasing at a rate proportional to its radius...

Calculus - The area of a floating circular oil spill in the ocean is increasing ...

calculus - oil is leaking from a pipeline on the surface of a lake and forms an ...

MATHS help plizzz - A spherical balloon is being inflated and its radius is ...