Processing Math: Done
Solution 9.2c
From Mechanics
The sum of the forces is zero as the body has constant velocity. This means the sum of the forces in all directions is zero.
Resolving horisontally,
:42cos30
+P−Qcos45
=0
Resolving vertically,
:25+42sin30
−Qcos45
=0Q=cos45
25+42sin30
=460.707=65.1 N
Substituting this value for
−42cos30
=65.1
0.707−42
0.866=46−36.4=9.6 N