A 17,000-kg jet takes off from an aircraft carrier via a catapult (Fig. 6-39a). The gases thrust out from the jet's engines exert a constant force of 130 kN on the jet; the force exerted on the jet by the catapult is plotted in Fig. 6-39b. Determine the work done on the jet: (a) by the gases expelled by its engines during launch of the jet; and (b) by the catapult during launch of the jet.
Figure 6-39
Part (a)
The work done on the jet by the gases expelled by its engines during the launch of the jet.
Answer to Problem 14P
Solution:
Explanation of Solution
Area under force-displacement graph gives work done by the force.
Given:The gases thrust out from the jet’s engines exert a constant force of
Formula used: Work done:
Where, F is the applied force and d is the displacement.
Work done = Area under F-x curve
Calculation:
The gases thrust out from the jet’s engines and exert a constant force.
Therefore, work done by the gas is:
Conclusion:The work done on the jetby the gases expelled by its engines during the launch of the jet is
Part(b):
To Determine the work done on the jet by the catapult during the launch of the jet.
Answer to Problem 14P
Solution:The work done on the jet by the catapult during the launch of the jet is
Explanation of Solution
Area under force-displacement graph gives work done by the force.Given:The gases thrust out from the jet’s engines exert a constant force of
Formula used:
Work done:
Where, F is the applied force and d is the displacement.
Work done = Area under F-x curve
Calculation:
The work done by the catapult during the launch of the jet is:
Work done = Area under F-x curve
Conclusion:The work done on the jet by the catapult during the launch of the jet is
Chapter 6 Solutions
Physics: Principles with Applications
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