2/24 At what angle 8 must the 400-lb force be applied in order that the resultant R of the two forces have a magnitude of 1000 lb? For this condition what will be the angle between R and the horizontal? 400 lb 700 lb 0 PROBLEM 2/24

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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### Problem 2/24

**Problem Statement:**
At what angle \(\theta\) must the 400-lb force be applied in order that the resultant \(\mathbf{R}\) of the two forces have a magnitude of 1000 lb? For this condition, what will be the angle \(\beta\) between \(\mathbf{R}\) and the horizontal?

**Diagram Explanation:**

The problem involves a setup with two forces applied to a structure, connected at a pivot point \(O\):

- A force of 700 lb is applied horizontally to the right.
- A force of 400 lb is applied at an angle \(\theta\) to the horizontal.

The pivot point \(O\) shows the forces and angles:
- The 400-lb force is shown as a red arrow extending from the pivot point \(O\) at an angle \(\theta\) upwards from the horizontal.
- The 700-lb force is shown as a red arrow extending horizontal to the left from the pivot point \(O\).

The resultant force \(\mathbf{R}\) is the vector sum of these two forces, and it has a requested magnitude of 1000 lb. The problem asks for the angle \(\theta\) at which the 400-lb force must be applied to yield a resultant force \(\mathbf{R}\) of 1000 lb, and for the angle \(\beta\) between \(\mathbf{R}\) and the horizontal. 

**Calculation Strategy:**
1. **Determine \(\theta\)**: Use vector addition principles and magnitude formulas to determine the required angle \(\theta\).
2. **Determine \(\beta\)**: Once \(\theta\) is found, calculate the resultant vector angle with respect to the horizontal.

This problem involves principles of vector addition, trigonometry, and equilibrium analysis.
Transcribed Image Text:### Problem 2/24 **Problem Statement:** At what angle \(\theta\) must the 400-lb force be applied in order that the resultant \(\mathbf{R}\) of the two forces have a magnitude of 1000 lb? For this condition, what will be the angle \(\beta\) between \(\mathbf{R}\) and the horizontal? **Diagram Explanation:** The problem involves a setup with two forces applied to a structure, connected at a pivot point \(O\): - A force of 700 lb is applied horizontally to the right. - A force of 400 lb is applied at an angle \(\theta\) to the horizontal. The pivot point \(O\) shows the forces and angles: - The 400-lb force is shown as a red arrow extending from the pivot point \(O\) at an angle \(\theta\) upwards from the horizontal. - The 700-lb force is shown as a red arrow extending horizontal to the left from the pivot point \(O\). The resultant force \(\mathbf{R}\) is the vector sum of these two forces, and it has a requested magnitude of 1000 lb. The problem asks for the angle \(\theta\) at which the 400-lb force must be applied to yield a resultant force \(\mathbf{R}\) of 1000 lb, and for the angle \(\beta\) between \(\mathbf{R}\) and the horizontal. **Calculation Strategy:** 1. **Determine \(\theta\)**: Use vector addition principles and magnitude formulas to determine the required angle \(\theta\). 2. **Determine \(\beta\)**: Once \(\theta\) is found, calculate the resultant vector angle with respect to the horizontal. This problem involves principles of vector addition, trigonometry, and equilibrium analysis.
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