Aspherical iron ball 6 in. in diameter is coated with a layer of ice of uniform thickness. if the ice melts at a rate of 12 startfraction in cubed over min endfraction comma how fast is the thickness of the ice decreasing when it is 2 in. thick? how fast is the outer surface area of ice decreasing?

Explanation:

Rate of melting of ball is given as

now we know that

now we have

so we have

Diameter = 6 inch

Radius = 3 inch

Now rate of change in area is given as

so we have

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

i think the answer is a, hope this : )