Related+Rates+Quiz+for+Cory

Cory's Related Rates Quiz

4) Let S be the surface area of a sphere with radius r at time t. If the **radius** changes at a rate of -5 m/hr, at what rate is the sphere's **surface area** changing when r = 1?

Need a formula? Click @Formulas for Related Rates Calc Quiz.


 * 4) || [[image:http://cow.temple.edu/~cow/images/auxiliary/StreetlightImages/Man%20and%20streetlight.lightman.gif]] || A 2 m tall man is strolling away from a 16 m high streetlight at the rate of 1.5 m per second. How fast is the man's shadow growing as he strolls? ||

1) A 20 ft long ladder is leaning against a wall, but is sliding down. At the moment when the base of the ladder is 12 ft from the wall and is sliding away at 5 fps, how high is the top of the ladder and how fast is it sliding down?