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 Principles of Statics

Equilibrium of Force System
 Equilibrium of Concurrent Force System
 Equilibrium of Parallel Force System

Equilibrium of NonConcurrent Force System
 Problem 346  Equilibrium of NonConcurrent Force System
 Problem 347  Equilibrium of NonConcurrent Force System
 Problem 348  Equilibrium of NonConcurrent Force System
 Problem 349  Equilibrium of NonConcurrent Force System
 Problem 350  Equilibrium of NonConcurrent Force System
 Problem 351  Equilibrium of NonConcurrent Force System
 Problem 352  Equilibrium of NonConcurrent Force System
 Problem 353  Equilibrium of NonConcurrent Force System
 Problem 354  Equilibrium of NonConcurrent Force System
 Problem 355  Equilibrium of NonConcurrent Force System
 Problem 356  Equilibrium of NonConcurrent Force System
 Problem 357  Equilibrium of NonConcurrent Force System
 Problem 358  Equilibrium of NonConcurrent Force System
 Problem 359  Equilibrium of NonConcurrent Force System
 Problem 360  Equilibrium of NonConcurrent Force System
 Problem 361  Equilibrium of NonConcurrent Force System
 Analysis of Structures
 Friction
 Centroids and Centers of Gravity
 Moment of Inertia and Radius of Gyration
 Dynamics
 Force Systems in Space
why cos60 to get the force…
why cos60 to get the force in T
I am not sure which line of…
In reply to why cos60 to get the force… by Jerrie Vy Subaldo
I am not sure which line in the solution you are referring. Are you referring to A_{H} = T cos θ? It is the only line involving cos 60°. If yes, this is the reason:
The component of T in the horizontal direction is T_{x} = T cos 180° or equal to T cos 60° if you just equate rightward and leftward forces.