MoIEST7300-Two bushwalkers, Li and Phuoc, each weighing 70

Two bushwalkers, Li and Phuoc, each weighing 70 kg, climb to a lookout at the top of a hill that is 100 m high. There are two paths to the top, a short, steep one and a long one with gentle slope that winds around the hill. Li takes the steep path and arrives at the lookout in 15 minutes. Phuoc chooses the gentle path and arrives in 45 minutes. (i) (5 marks) What is the energy in joules used by each bushwalker in walking up to the lookout? (ii) (6 marks) What is the average power in watts used by each bushwalker in walking up to the lookout? (You may approximate the acceleration due to gravity as 10 m/s/s.) (b) (9 marks) A wind turbine rated at 3 megawatts (MW) generates 8760 megawatthours (MWh) over a 12-month period. What are its capacity factor and its average power output in watts, where the average is taken over the year? (Note: There are 8760 hours in a year.)