Could someone please explain how to answer the questions below?

Name TEST I PH3700, Fundamentals of energy NOTICE: In solving this test, you may only use an "81/2 x 11" formula sheet, the conversion and units table, a periodic table, the isotope mass table, and the spaghetti energy chart. By submitting your solutions you are signifying that you have neither received assistance from anyone nor given assistance to anyone. Failure to comply with this requirement is a violation of the NPS Honor Code, and you would be subject to dismissal from NPS. Box all answers 5. (6 pt) There are two methods for getting usable energy from nuclear fusion. What are they? 6. (6 pt) What is methane hydrate? 7. (12 pt) A car traveling at constant speed experiences 300 N of air resistance. If the car travels 100 km, A. How much work is done by the air resistance? B. How many kg of gasoline are used? 8. (12 pt) The engine of a steam locomotive operates between 300 C and 20 C. A. What is its theoretical maximum efficiency? B. If 12 metric tons of coal are burned, how much work is ideally produced