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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman
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A man is dragging a trunk up the loading ramp of a mover’s

Chapter 7, Problem 4E

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QUESTION:

A man is dragging a trunk up the loading ramp of a mover’s truck. The ramp has a slope angle of 20.0°, and the man pulls upward with a force whose direction makes an angle of 30.0° with the ramp (Fig.). (a) How large a force is necessary for the component ?Fx?, parallel to the ramp to be 60.0 N? (b) How large will the component ?Fy? perpendicular to the ramp then be? Figure:

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QUESTION:

A man is dragging a trunk up the loading ramp of a mover’s truck. The ramp has a slope angle of 20.0°, and the man pulls upward with a force whose direction makes an angle of 30.0° with the ramp (Fig.). (a) How large a force is necessary for the component ?Fx?, parallel to the ramp to be 60.0 N? (b) How large will the component ?Fy? perpendicular to the ramp then be? Figure:

ANSWER:

Solution to 4E Step 1 Here a slope is at an angle of 20 degrees from the horizontal. A crate is pulled by a man at an angle of 30 degrees with respect to the slope. Thus the free body diagram is as follows,

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