College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Transcribed Image Text:A decoration hangs at rest from a string. A second, horizontal string is
knotted to the first, pulling it to the right, as shown below. The top
section of the first string is at an angle of 25° to the vertical. The
tension in the horizontal string is 0.8 N.
Take the magnitude of the acceleration due to gravity to be
9 = 9.8 ms 2.
250!
j
(a) State the three forces acting on the knot, and draw a force
diagram to represent them, labelling the forces appropriately and
indicating their directions by marking the sizes of relevant angles.
(b) Find expressions for the component forms of the three forces, in
terms of unknown magnitudes where appropriate, taking the
Cartesian unit vectors i and j to point horizontally and vertically,
respectively, in the directions shown above.
(c) Find the mass of the decoration, to two significant figures.
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