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A pole projects horizontally from the front wall of a shop. A 5.1-kg sign hangs from the
Chapter 9, Problem 47P(choose chapter or problem)
Problem 47P
A pole projects horizontally from the front wall of a shop. A 5.1-kg sign hangs from the pole at a point 2.2 m from the wall (Fig. 9–68). (a) What is the torque due to this sign calculated about the point where the pole meets the wall? (b) If the pole is not to fall off, there must be another torque exerted to balance it. What exerts this torque? Use a diagram to show how this torque must act. (c) Discuss whether compression, tension, and/or shear play a role in part (b).
Figure 9–68
Questions & Answers
QUESTION:
Problem 47P
A pole projects horizontally from the front wall of a shop. A 5.1-kg sign hangs from the pole at a point 2.2 m from the wall (Fig. 9–68). (a) What is the torque due to this sign calculated about the point where the pole meets the wall? (b) If the pole is not to fall off, there must be another torque exerted to balance it. What exerts this torque? Use a diagram to show how this torque must act. (c) Discuss whether compression, tension, and/or shear play a role in part (b).
Figure 9–68
ANSWER:
Solution
Step 1 of 3
- We need to find out the torque due to the sign calculated about the point where the pole meets the wall.
The torque due to the sign,
