Question

The magnitude of the unknown force can’t be known. But the direction can be founded out.

(a) The first part of the statement is false and other part is true

(b) The first part of the statement is false and other part is false too

(c) The first part of the statement is true and other part is false

(d) The first part of the statement is true and other part is true too

The question was posed to me in exam.

Query is from Method of Joints in section Structural Analysis of Engineering Mechanics

Answer 1

Right answer is (a) The first part of the statement is false and other part is true

Explanation: The first part is wrong. We can determine the magnitude of the unknown force. It can be done by using the equilibrium equations. That equating the forces zero, of the three different axis. Thus making the components of the unknown founded out.