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Ch 05: Applying Newton's Laws
Young & Freedman Calc - University Physics 14th Edition
Young & Freedman Calc14th EditionUniversity PhysicsISBN: 9780321973610Non è quello che usi tu?Cambia libro di testo
Capitolo 5, Problema 7

Find the tension in each cord in Fig. E5.75.7 if the weight of the suspended object is ww.
Diagram showing a suspended object with weight 'w' and two cords at angles of 30° and 45°, labeled A, B, and C.
Diagram showing a suspended object with weight w, supported by two cords at angles of 60° and 45°.

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Step 1: Identify the forces acting on the system. The object of weight w is suspended by three cords: cord A, cord B, and cord C. Cord C is vertical, while cords A and B are at angles of 20° and 35° respectively with the horizontal.
Step 2: Apply equilibrium conditions. Since the object is stationary, the forces in both the horizontal and vertical directions must sum to zero. This gives two equations: ΣFx = 0 (horizontal forces) and ΣFy = 0 (vertical forces).
Step 3: Write the horizontal force equation. The horizontal components of the tensions in cords A and B must cancel each other out: T_A * cos(20°) = T_B * cos(35°).
Step 4: Write the vertical force equation. The vertical components of the tensions in cords A and B must balance the weight w and the tension in cord C: T_A * sin(20°) + T_B * sin(35°) = w.
Step 5: Solve the system of equations. Use the two equations derived in steps 3 and 4 to solve for the tensions T_A and T_B in cords A and B. Cord C's tension is equal to the weight w since it directly supports the object vertically.

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Tension in Cords

Tension is the force exerted along a cord or rope when it is pulled tight by forces acting from opposite ends. In this scenario, the tensions in cords A and B must balance the weight of the suspended object (w) while also considering the angles at which the cords are positioned. The tension can be calculated using the components of the forces acting in both the vertical and horizontal directions.
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Calculating Tension in a Pendulum with Energy Conservation

Equilibrium of Forces

For an object to be in equilibrium, the sum of all forces acting on it must equal zero. This means that the vertical components of the tensions in the cords must equal the weight of the object, while the horizontal components must cancel each other out. This principle allows us to set up equations based on the angles and the weight to solve for the tensions in the cords.
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Trigonometric Functions

Trigonometric functions, such as sine and cosine, relate the angles of a triangle to the ratios of its sides. In this problem, these functions are essential for resolving the tension forces into their vertical and horizontal components. For example, the vertical component of the tension in cord A can be found using T_A * sin(20°), and similarly for cord B using T_B * sin(35°).
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Intro to Wave Functions
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