Tuesday

March 3, 2015

March 3, 2015

Posted by **David** on Thursday, October 20, 2011 at 1:16pm.

- calculus -
**Steve**, Thursday, October 20, 2011 at 3:30pmIn two seconds, the area increased by π. So,

da/dt = π/2

a = π/2 r^{2}

At t=7, a=5π

5π = π/2 r^{2}

10 = r^{2}

r = √10

a = π/2 r^{2}

da = πr dr/dt

π/2 = π√10 dr/dt

dr/dt = 1/2√10

**Answer this Question**

**Related Questions**

AP Biology - After an enzyme is mixed with its substrate, the amount of product ...

calculus - The radius of the base of a right circular cylinder is r com and the ...

Calculus I - Let A be the area of a circle with radius r that is increasing in ...

Calculus - How fast is the area of a square increasing when thh side is 3m in ...

Calculus - if the surface area of a sphere is given by the formula SA=4pir^2, ...

calculus - 3. The radius r of a sphere is increasing at a constant rate of 0.04 ...

college calculus - 1) each side of a square is increasing at a rate of 6cm/s. At...

Calculus - A pebble is dropped into a pond, causing ripples in the form of ...

calculus - Melting Snowball: A spherical snowball melts at a rate proportional ...

Calculus (Parts A and B done, just help with C) - The radius, r, of a sphere is ...