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Physic problems serious answer please 10 points?

1) How much pressure must be produced in a cylinder with a diameter of 10 CM that moves 5cm after an explosion in the cylinder doing 1000 joules of work. IF the temperature in the cylinder is 450 °C What is the maximum efficiency on a sunny day where the temperature is 35°C ?

2) what is Charles Law and how is it used to determine absolute zero? Determine absolute zero from the following data and calculate the percent error
T1= 100°C , V1=150cubic centimeter and T2 = 0 °C ,V2= 120cubic centimeter

3) A coal power plant operates a boiler making steam at 450 °C that runs a generator to do electrical work. The steam leaves the generator at 200 °C. In addition, the energy used to create the steam is 2 times 10^6 Joules however only 5.6 times 10^5 joules are produced by the generator. What is the ideal efficiency and the actual efficiency?