Here's the question you clicked on:
nasryn
Oil spilled from a ruptured tanker is spreading in a circular pattern. If the radius of the circle is increasing at the constant rate of 1.5 feet per second, how fast is the area of the spill increasing when the radius of the spill is 42 feet?
use speed time formula...
I've never heard of that.
\(A=\pi r^2\) and so \(A'=2\pi rr'\)
you are told \(r'=1.5\) and \(r=42\) plug in the numbers and get \(A'\) in one step
wow, that was easy. I'm terrible at these.
yeah, i have to admit that one was real easy they get harder
well only the formulas get harder to figure out, i am willing to bet that you knew the formula for the area of a circle
yeah, I was just thinking like A=pi(r^t/1.5)^2 then I was super confused
That made absolutely no sense to me.
The minute hand on a watch is 8mm long and the hour hand is 4 mm long. How fast is the distance between the tips of the hands changing at one o'clock? THat's the hardest one I have done myself.