handwrit/e and show all work and steps

61 Work, Constant Force 1. (I) A 75.0kg fire fighter climbs a flight of stairs 28.0 m high. How much work does he do? 3. (II) How much work did the movers do (horizontally) pushing a 46.0-kg crate 10.3 m across a rough floor without acceleration, if the effective coefficient of friction was 0.50? 5. (II) What is the minimum work needed to push a 950kg car 710 m up along a 90 incline? Ignore friction. 7. (II) In a certain library the first shelf is 15.0 cm off the ground, and the remaining four shelves are each spaced 38.0 cm above the previous one. lfthe average book has a mass of 1.40 kg with a height of 22.0 cm, and an average shelf holds 28 books (standing vertically), how much work is required to fill all the shelves, assuming the books are all laying flat on the floor to start? 63 Kinetic Energy; Work-Energy Principle 15. (I) At room temperature, an oxygen molecule, with mass of 5.31>