(a) How much work is done in lifting a 1.1-kg book off the floor to put it on a desk that is 0.6 m high? Use the fact that the acceleration due to gravity is g = 9.8 m/s². (b) How much work is done in lifting a 21-lb weight 7 ft off the ground? Solution (a) The force exerted is equal and opposite to that exerted by gravity, so the force is d²s at² mg (1.1)(9.8)= and then the work done is W=Fd= F=m (0.6)=[ (b) Here the force is given as F 21 lb, so the work done is W=Fd=21-7- ft-lb.

(a) How much work is done in lifting a 1.1-kg book off the floor to put it on a desk that is 0.6 m high? Use the fact that the acceleration due to gravity is g = 9.8 m/s². (b) How much work is done in lifting a 21-lb weight 7 ft off the ground? Solution (a) The force exerted is equal and opposite to that exerted by gravity, so the force is d²s at² mg (1.1)(9.8)= and then the work done is W=Fd= F=m (0.6)=[ (b) Here the force is given as F 21 lb, so the work done is W=Fd=21-7- ft-lb.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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