A jet fighter has to accelerate to a velocity of 80m/s from rest within a distance of 100m during take-off.
Mass of jet fighter : 20000kg
Engines produce thrust : 90000N
If the jet fighter is assisted by a catapult, it can reach 80m/s in 2s.
What is the energy provided by the engines?
What is the energy provided by the catapult?
Phy (energy-jet fighter)
2012-06-09 3:01 am
回答 (1)
2012-06-09 4:18 am
✔ 最佳答案
What is the energy provided by the engines?Energy provide by engine = 90000 x 100 J = 9x10^6 J
What is the energy provided by the catapult?
Kinetic energy gained by jet fighter = (1/2)x(20000) x (80^2) J
= 6.4x10^7 J
Hence, energy provided by catapult
= (6.4x10^7 - 9x10^6) J
= 5.5 x 10^7 J
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https://hk.answers.yahoo.com/question/index?qid=20120608000051KK00462