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A bird sits on a telephone wire midway between two poles 20 m apart. The wire assumed weightless sags by 50 cm. If the tension in the wire is 90 N, what is the mass of the bird?

A bird sits on a telephone wire midway between two poles 20 m apart. The wire assumed weightless sags by 50 cm. If the tension in the wire is 90 N, what is the mass of the bird?

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Solve the problem below by following the given steps.
Step 1: Represent the problem by making a sketch of the problem and by gathering all pertinent data given. Step 2: Draw the free body diagram of the object(s) labeling all external forces acting on the object(s). Step 3: Choose a convenient two coordinate system, resolve all forces into their rectangular components. Step 4: Apply the l" condition of equilibrium at each of the two axes. Remember the sign convention. For forces along the x- axis; a force to the right is positive while a force to the left is negative and for the y- axis, an upward force is positive, a downward force is negative. Bear in mind also that the signs indicate the direction of the forces. (refer to the resolution and addition of vectors) Step 5: Solve for your unknown forces. If you have more than one unknown as you often will remember to derive as many independent equations as the number of unknown forces you have. This will give you a set of simultaneous equation wherein the unknowns can be solved in terms of the given quantities. You use algebra as a mathematical tool until you are able to solve for what is asked of you in the problem.
Transcribed Image Text:Step 1: Represent the problem by making a sketch of the problem and by gathering all pertinent data given. Step 2: Draw the free body diagram of the object(s) labeling all external forces acting on the object(s). Step 3: Choose a convenient two coordinate system, resolve all forces into their rectangular components. Step 4: Apply the l" condition of equilibrium at each of the two axes. Remember the sign convention. For forces along the x- axis; a force to the right is positive while a force to the left is negative and for the y- axis, an upward force is positive, a downward force is negative. Bear in mind also that the signs indicate the direction of the forces. (refer to the resolution and addition of vectors) Step 5: Solve for your unknown forces. If you have more than one unknown as you often will remember to derive as many independent equations as the number of unknown forces you have. This will give you a set of simultaneous equation wherein the unknowns can be solved in terms of the given quantities. You use algebra as a mathematical tool until you are able to solve for what is asked of you in the problem.
15. A bird sits on a telephone wire midway between two poles 20 m apart. The wire assumed weightless sags by 50 cm. If the tension in the wire is 90 N, what is the mass of the bird?
Transcribed Image Text:15. A bird sits on a telephone wire midway between two poles 20 m apart. The wire assumed weightless sags by 50 cm. If the tension in the wire is 90 N, what is the mass of the bird?
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