Friday

January 30, 2015

January 30, 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 - How fast is the area of a square increasing when thh side is 3m in ...

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

Optimization - A Norman window has the shape of a semicircle atop a rectangle so...

Physic - a block was push by a constant 90N horizontal force, it moved 12 meters...

Calculus - Find the area under one arch of a cycloid describe by the parametric ...

Calculus - Find the area in the first quadrant bounded by the arc of the circle ...

calculus - A Norman window has the shape of a semicircle atop a rectangle so ...

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

5th GRADE MATH - Jamie is forming a cylinder out of two circles and a rectangle...