1. A coal-burning plant station provides the energy needs of a certain community which has an average power requirement of 670 MW. The power station has an overall efficiency of 35%. The specific energy of coal is 28x10^6 jxkg^-1. Calculate the mass of coal burned every second. Report your answer in kg with 2 sig figs.

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

Which two particles are found in the center of an atom

Convection occurs when thermal energy is transferred by the movement of