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Figure 7-28 shows three forces applied to a trunk that
Chapter , Problem 15(choose chapter or problem)
Figure 7-28 shows three forces applied to a trunk that moves leftward by 3.00 m over a frictionless floor. The force magnitudes are F1 ! 5.00 N, F2 ! 9.00 N, and F3 ! 3.00 N, and the indicated angle is u ! 60.0(. During the displacement, (a) what is the net work done on the trunk by the three forces and (b) does the kinetic energy of the trunk increase or decrease?
Questions & Answers
QUESTION:
Figure 7-28 shows three forces applied to a trunk that moves leftward by 3.00 m over a frictionless floor. The force magnitudes are F1 ! 5.00 N, F2 ! 9.00 N, and F3 ! 3.00 N, and the indicated angle is u ! 60.0(. During the displacement, (a) what is the net work done on the trunk by the three forces and (b) does the kinetic energy of the trunk increase or decrease?
ANSWER:Step 1 of 3 a) The work done by the force on the trunk is given by, Here the direction of force and the direction of displacement are in the same direction. So, Given, the displacement The magnitude of force, So the work done, The work done by the force on the trunk is given by, The angle, Given, The magnitude of force, So the work done,\n The work done by the force on the trunk is given by, The angle between the displacement and force is Given, The magnitude of force, So,