Question

How much work does it take to dig a hemispherical pit with radius 10 meters? How many servings of pasta are required to complete this work, assuming the energy from the pasta is converted with 5% efficiency to work and that one serving of pasta contains about 200 Cal, the density of soil is 1000kg/m3, the gravity constant is 9.81m/s2 and 4184 J is about 1 Cal.

Answer 1