Chapter 4 problem 3: A man is dragging a trunk up the loading ramp of a mover\'s

Question

Chapter 4 problem 3: A man is dragging a trunk up the loading ramp of a mover's truck. The ramp has a slope angle of 20.0deg, and the man pulls upward with a force F of magnitude 375N whose direction makes an angle of 30.0deg with the ramp. Find the horizontal and vertical components of the force F. vs. Chapter 5 problem 6: A 1130-kg car is held in place by a light cable on a very smooth (frictionless) ramp, as shown in figure 5.39. The cable makes an angle of 31.0deg above the surface of the ramp, and the ramp itself rises 25.0deg above the horizontal.(a) Draw a free body diagram for the car. (b) Find the tension in the cable. (c) How hard does the surface of the ramp push on the car? My question: why do you add the two angles in the first problem but not the second problem (when finding the tension)? (book: college physics by young, 9th edition)

Explanation / Answer

horizontal component is=375cos50=241.04 N vertical component is =375sin50=287.27 N in the second case we will do not add angles bcoz there is a separate body car which is pulled by a cable so according to the free body diagram angles can not be added. but in first case there is only single body which is man itself so the angles can be added up

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