Q. A persone has a choice between an apple or an orange. the persone chooses the apple. Elucidate what is the opportunity cost of choosing the apple?
Q. If the sand you ran across has a specific-heat capacity of 835 J/(kg°C), explain how much energy must be added to a 2-kilogram pile of it to increase its temperature from 40°C to 50°C? Show your work.