Trequires1200 kg of coal to produce the energy needed to make 1.0 kg of aluminum metal. if a single soda can requires approximately 15 g of al, what mass of coal would be needed to produce a 6-pack of cans?

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600