Name: Date: Gavilan College AMT 100 Physics Worksheet #2 – Work & Power Points: 11 1 gallon of avgas = 113,280 BTU (British Thermal Unit). 1 BTU = 778 ft-lb. 1 HP (horsepower) = 33,000 ft-lb/minute = 550 ft-lb/sec. 1 HP = 746 watts. Show all your work! 1. How much work is exerted when lifting 100 lbs 50 feet (in ft-lb)? 2. How much work is exerted when you lift 3 boxes, each weighing 25 lbs, 15 feet (in ft-lb)? 3. How much work can be done by a gallon of avgas (in ft-lb)? 4. 2250 ft-lb of work would lift a 150 lb weight how high? 5. An engine is 25% efficient. If 400 ft-lb of energy is put into the engine, how much work will come out (in ft-lb)? 6. An engine is 30% efficient. If the engine burns 2 gallons of avgas, how much work will the engine put out (in ft-lb)? 7. 15 HP equals how many watts? 8. How much horsepower is needed to raise 7,500 lbs 1,500 ft in 2 minutes? 9. How much horsepower is needed to raise 1 ton (2,000 lbs/ton) 100 ft in 30 seconds? 10. An engine is 27% efficient. It burns 10 gallons of avgas per hour. How much power does the engine put out? 11. Using the information from question 10, how much power is wasted? Page 1 of 1