Jet fighter planes are launched from aircraft carriers with the aid of their own

Question

Jet fighter planes are launched from aircraft carriers with the aid of their own engines and a catapult. If in the process of being launched from rest, the thrust of a jet's engines is 2.20% 105 N and after moving through a distance of 90 m the plane lifts off with a kinetic energy of 4.20 x 107 J, what is the work done on the jet by the catapult? Additional Materials Reading 5. -1 points OSColPhys2016 7.3.WA 022 My Notes Ask Your Teac Consider a system of a cliff diver and the earth. The gravitational potential energy of the system decreases by 26,500 J as the diver drops to the water from a height of 30.0 m. Determine her weight in newtons. Additional Materials Reading

Explanation / Answer

W = the change in KE

KE(initial) = 0

KE(final) = 4.2 x 10^7 J

W(plane) + W(catapult) =work(total) = KE(final)

W(plane) = Fd

W(plane) = 2.20 x 10^5 N (90 m)

W(plane) = 198 x 10^5 J

198 x 10^5 + W(catapult) = KE(final) - KE(initial)

198 x 10^5 + W(catapult) = (4.2 x 10^7) - 0

W(Catapult) = (4.2 x 10^7) – (198 x 10^5) = 2.2 x 10^7 J

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