Lift Carrier Power Reposting this question again....need more responses?
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 2.40 105 N. In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 4.90 107 J at lift-off. What is the work done on the jet by the catapult?
Tried two different ways and both were wrong.....what am i doing wrong
1st attempt
W=Chane Kinetic Energy
Wc=Fs=(2.40*10^5)87=20880000J
Wc=323218.391
2nd attempt
We+Wc=change KE
Wc=2.347
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Additional Details
2 minutes ago
For the response
The KE at lift of is 4.9x10^7, meaning that 2.612x10^7 J comes from the catapult.
how did you get the 2.612X10^7<
This is what I think:
Total KE of jet = work done by thrust + work done by catapult
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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 1.90 x 105 N. In being launched from rest it moves through a distance of 51.2 m and has a kinetic energy of 7.22 x 107 J at lift-off. What is the work done on the jet by the catapult?
The kinetic energy of the jet is provided by the thrust of the engines over the distance it has moved and the work done by the catapult.
Work done = force x distance.
So the work done by the engines is 1.9x10^5 x 51.2 = 9.728x10^6 J
The work done by the catapult is the total energy of the jet minus the work done by the engines.
7.22x10^7 - 9.728x10^6 = 6.25x10^7 J
