A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.1 105 N. In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 4.5 107 J at lift-off. What is the work done on the jet by the catapult?
2006-11-05 10:43:44 · 2 answers · asked by karito22706 1 in Science & Mathematics ➔ Physics
The total Ke is the same as the work done by both the jets and the catapult. Since the jets did
2.1*10^5 * 87 = 18,270,000J and the total Ke is 4.5*10^7J then the catapult must have done
4.5*10^7 - 1.827*10^7 = 2.673*10^7 Joules of work on the aircraft.
Doug
2006-11-05 10:55:52 · answer #1 · answered by doug_donaghue 7 · 0⤊ 0⤋
Use Force * distance to get the energy added by the engines. Then subtract that energy from the total kinetic energy at lift-off to give the amount of energy added by the catapult.
2006-11-05 10:50:32 · answer #2 · answered by rscanner 6 · 0⤊ 0⤋