Still need help with this one:

Question

Find the work done in pumping the water over the rim of a tank that is 40 feet long and has a semicircular end of radius 10 feet if the tank is filled to a depth of 4 feet.

I've set up an integral that is:
62.4 ∫ [-10,-4] 80 sqrt(100-y^2)(-y)dy

62.4 because that's the density of water, but this isn't working. Please help

Answer 1

a depth of 4 feet means you need ∫ [-10,-6]