A fighter jet is launched from a aircraft carrier with the aid of its own engines and a steam-powered catapult. the thrust of its engines is 2.3x10^5N. In being launched from rest it moves through a distance of 87 meters and has a kinetic energy of 4.5x1.^7 J at lift off. what is the work done by the catapult?
2007-10-04 09:27:38 · 3 answers · asked by kwali 2 in Science & Mathematics ➔ Physics
The fighter jet obtains energy from both its own engines and the catapult.
The work done by the engines over the 87m distance:
W = F x d
= 2.3E5 x 87
= 2.00E7 Joules
Work(catapult) = KineticEnergy(jet) - Work(engines)
= 4.5E7 - 2.00E7
= 2.50E7 Joules
2007-10-04 14:42:10 · answer #1 · answered by Anonymous · 0⤊ 0⤋
There are two sources of work. Assuming the plane is launched level, there is no increase in potential energy, so the kinetic energy is provided from the sources. The engine work is W= F*d, where F=2.3x10^5 N and d=87m. Subtract that (converted to joules) from the kinetic energy to find the catapault-provided work.
2007-10-04 09:34:20 · answer #2 · answered by cattbarf 7 · 1⤊ 0⤋
Subtract the work done by the ship traveling at flank speed, also. But the person who wrote the problem didn't take that into account.
2007-10-04 09:37:39 · answer #3 · answered by Anonymous · 0⤊ 0⤋