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4 (a) Define moment of a force. (b) An arrangement for lifting heavy loads is shown in Fig. 4.1. 60 wall B beam 2.8mm/ 30 load 500 N 4000 N Fig. 4.1 A uniform metal beam AB is pivoted on a vertical wall at A. The beam is supported by a wire joining end B to the wall at C. The beam makes an angle of 30 with the wall and the wire makes an angle of 60 with the wall. The beam has length 2.8m and weight of 500 N. A load of 4000 N is supported from B. The tension in the wire is T. The beam is in equilibrium. (1) By taking moments about A, show that Tis 2.1 kN. [2] (II) Calculate the vertical component T, of the tension T. T₁ = . N[1] (ii) State and explain why T, does not equal the sum of the load and the weight of the beam although the beam is in equilibrium. ..121

4 (a) Define moment of a force. (b) An arrangement for lifting heavy loads is shown in Fig. 4.1. 60 wall B beam 2.8mm/ 30 load 500 N 4000 N Fig. 4.1 A uniform metal beam AB is pivoted on a vertical wall at A. The beam is supported by a wire joining end B to the wall at C. The beam makes an angle of 30 with the wall and the wire makes an angle of 60 with the wall. The beam has length 2.8m and weight of 500 N. A load of 4000 N is supported from B. The tension in the wire is T. The beam is in equilibrium. (1) By taking moments about A, show that Tis 2.1 kN. [2] (II) Calculate the vertical component T, of the tension T. T₁ = . N[1] (ii) State and explain why T, does not equal the sum of the load and the weight of the beam although the beam is in equilibrium. ..121

Glencoe Physics: Principles and Problems, Student Edition
Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter8: Rotational Motion
Section: Chapter Questions
Problem 90A
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4 (a) Define moment of a force. (b) An arrangement for lifting heavy loads is shown in Fig. 4.1. 60 wall B beam 2.8mm/ 30 load 500 N 4000 N Fig. 4.1 A uniform metal beam AB is pivoted on a vertical wall at A. The beam is supported by a wire joining end B to the wall at C. The beam makes an angle of 30 with the wall and the wire makes an angle of 60 with the wall. The beam has length 2.8m and weight of 500 N. A load of 4000 N is supported from B. The tension in the wire is T. The beam is in equilibrium. (1) By taking moments about A, show that Tis 2.1 kN. [2] (II) Calculate the vertical component T, of the tension T. T₁ = . N[1] (ii) State and explain why T, does not equal the sum of the load and the weight of the beam although the beam is in equilibrium. ..121
Transcribed Image Text:4 (a) Define moment of a force. (b) An arrangement for lifting heavy loads is shown in Fig. 4.1. 60 wall B beam 2.8mm/ 30 load 500 N 4000 N Fig. 4.1 A uniform metal beam AB is pivoted on a vertical wall at A. The beam is supported by a wire joining end B to the wall at C. The beam makes an angle of 30 with the wall and the wire makes an angle of 60 with the wall. The beam has length 2.8m and weight of 500 N. A load of 4000 N is supported from B. The tension in the wire is T. The beam is in equilibrium. (1) By taking moments about A, show that Tis 2.1 kN. [2] (II) Calculate the vertical component T, of the tension T. T₁ = . N[1] (ii) State and explain why T, does not equal the sum of the load and the weight of the beam although the beam is in equilibrium. ..121
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