1.an iron cube at 400 degrees Celsius is dropped into a insulated bath containing 10kg of water @ 25 degrees Celsius. the water finally reaches a temperature of 50 degrees Celsius at steady state. given that the specific heat of water is equal to 4186j/kg k find the specific heat capacity of iron
2.Carnot engine working between a source temperature of T2 and sink temperature of T1 has efficiency of 25%. if the sink temperature is reduced by 20 degrees Celsius the efficiency is increased to 30%. find the source and sink temperature
3.A machine has an initial cost of $10,000. Its market value declines by 20% annually. The repair costs are covered by a warranty in year 1, and then they increase $600 per year. The firm's MARR is 15%. Find the minimum EUAC for this machine and its economic life (in years).