A white dwarf can exhibit an astonishing density of ρ ≈ 1000…

A white dwarf can exhibit an astonishing density of ρ ≈ 1000 kg/cm3.  If one had material from a white dwarf that was contained within a paintball of diameter D ≈ 1.8 cm, what would be its mass in kg?   Insert those values directly into the formula: M ≈ ρ x D3 / 2 , and in this instance, provide the answer without units and rounded to the nearest integer (e.g., 80.6 -> 81). 

You are the Independent System Operator (ISO) in an electric…

You are the Independent System Operator (ISO) in an electricity market. You have received the bid information in the table below for a double auction. Each buyer’s bid is an offer to buy one unit of electricity. Each seller’s bid is an offer to sell one unit of electricity.