1 1. A man is pulling three boxes behind him each attached by a rope, as shown in the diagram. The first two boxes (1 and 2) have a mass of 10kg each and the last (3) has a mass of 5kg. The man is pulling them forward with 147N of force and friction is negligible. a. Calculate the force of tension between Box 1 and Box 2. (3 marks) b. Calculate the force of tension between Box 2 and Box 3. (2 marks) 12. A scientist places a 5.0 kg mass of iron at 480C into a container of water at 40C. If the scientist wishes to bring the temperature of iron to 65C, what mass of water would be required? (Ciron = 450 J/(kge.C)) (3 marks) 13. A man lifts a 1 1.0 kg box up onto a table that is 1.5 m tall. a. How much work is done to lift the box? (2 marks) b. If the man is able to life the box is 2 seconds, how much power is being generated by the man? (2 marks)