The drawing shows a plane diving towards the ground and then climbing back upwar

Question

The drawing shows a plane diving towards the ground and then climbing back upward. During each of these motions, the lift force acts perpendicular to the dispacement , which has the same magnitude, of 2.70 103 m, in each case. The engines of the plane exert a thrust , which points in the direction of the displacement and has the same magnitude during the dive and the climb. The weight of the plane has a magnitude of 6.40 104 N. In both the motions, net WORKis performed due to the combined action of the forces , and .


(1) Is more net work done during the dive or the climb?
a) more net work done during the climb
b)more net work done during the dive
c)equal net work done during the dive and the climb


(2) Find the difference between the net work done during the dive and the climb.

Explanation / Answer

(b) more net work done during the dive since dive work = ( Thrust + mg ) displacement climb work = ( Thrust - mg ) displacement different between net work done during dive and climb =2mg*displacement =2*6.4e4*2.7e3= 345.6 MJ

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