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1. A gas-filled cylinder is fitted with a movable piston at one end. When 200J of heat is added to the system of gas, It expands, pushing the piston upward and performing an 100J of work. What is the change in the Internal energy of the gas? (5 points)
2. A hot air balloon was filled with air heated at 45KJ and sustained and a 2000J work done by the system. what change in Internal energy does the system acquired? (5 points)
3. A gas-filled cylinder is fitted with a movable piston at one end. When 100J of heat is added to the system of gas. It expands, pushing the piston upward and performing an 60J of work. What is the change in the internal energy of the gas? (5 points)
4. A hot air balloon was filled with air heated at 50KJ and sustained and a 2500J work done by the system, what change in Internal energy does the system acquired? (5 points)
5. A person weighs 180 lbs and intended to lose 80 lbs of weight. This would lead the person to release a total amount of 185 calories heat from the person body. What amount of work does the person need to exert to maintain an internal energy of 650J?​​