Question
Asked Oct 9, 2019
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12 ft
8 ft
40
30
10 ft
E
6 ft
Fig. P4.177
Fig.P4.178
2 ft
4.178 Deternmine the angle d or which the uniform bar of length L and weight
wwill be in equilibrium. Neglect friction
900 lb f
3 ft
4.179 Determine the magnitudes of the pin reactions at A, C, and E. Neglect
the weight of the frame.
E
6 ft
4.180 Calculate the forces in members (a) DE; (b) BE, and (c) BC. Indicate
tension or compres sion.
Fig. P4.179
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12 ft 8 ft 40 30 10 ft E 6 ft Fig. P4.177 Fig.P4.178 2 ft 4.178 Deternmine the angle d or which the uniform bar of length L and weight wwill be in equilibrium. Neglect friction 900 lb f 3 ft 4.179 Determine the magnitudes of the pin reactions at A, C, and E. Neglect the weight of the frame. E 6 ft 4.180 Calculate the forces in members (a) DE; (b) BE, and (c) BC. Indicate tension or compres sion. Fig. P4.179

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Expert Answer

Step 1

Sketch the Free Body Diagram as shown in Figure 1.

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6 ft 2 ft С В 900 lb-ft 3 ft Ex D 6 ft E

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Step 2

Refer to Figure.

Use equilibrium equations:

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ΣΜ,-0 -E, x 6-900 0 E 150lb() +% ΣΕ, -0 D-150 0 D, 150lb() +-Σ 0 E 0 Χ

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Step 3

Consider joint E.

The magnitude of pin reaction at E is 150 lb.

Consider pin A.

There is no member forces’ acting on the member AD.

So the upward force 150 lb a...

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