Chapter 8.1, Problem 31E

Kaminksy bronze sculpture is 5 feet in diameter, which is approximately 1.524 meters. if the sculpture was made of solid bronze, it's weight could be approximated using the density of bronze (d=7700 kg/m^3), the volume V in cubic meters, the mass, M, in kilograms and applying the formula d= m/v. Approximately, how many pounds would the sculpture weigh if it was made of solid bronze. (1 kg ≈ 2.205lb)

A trough is 10 feet long and 2 feet across the top. It's sides are isosceles triangles with altitudes of 2.5 feet. If water is being pumped out of the tank at a rate of 5 cubic feet per second, find the following:  find the rate, in feet per second, at which the water level is changing at the instant the water level is at 1.25 feet. In ft/s