Chapter_7_Student_Problems

# Chapter_7_Student_Problems - Problem 7-13 Figure 7-29 shows...

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Problem 7-13 F 1 = 5.00 N F 2 = 9.00 N F 3 = 3.00 N ∆x = 3.00 m Figure 7-29 shows three forces applied to a trunk that moves leftward by 3.00 m over a frictionless floor. The force magnitudes are F 1 = 5.00 N, F 2 = 9.00 N, and F 3 = 3.00 N, and the indicated angle is q = 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?

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In the figure, a horizontal force F a of magnitude 20.0 N is applied to a 3.00 kg psychology book as the book slides a distance d = 0.500 m up a frictionless ramp at angle θ = 30.0°. (a) During the displacement, what is the net work done on the book by F a , the gravitational force on the book, and the normal force on the book? (b) If the book has zero kinetic energy at the start of the displacement, what is its speed at the end of the displacement? W = 1.31 J
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## This note was uploaded on 02/21/2009 for the course PHY 3425345 taught by Professor Dr.schrieber during the Spring '08 term at TCNJ.

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Chapter_7_Student_Problems - Problem 7-13 Figure 7-29 shows...

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