Unformatted text preview: PROBLEM 2.8 For the hook support of Problem 2.1, knowing that the magnitude of P is 75 N, determine by trigonometry (a) the required magnitude of the force Q if the resultant R of the two forces applied at A is to he vertical, ([9) the corresponding
magnitude of R. PROBLEM 2.1 Two forces P and Q are applied as shown at Point A of a hook support. Knowing that P=75 N and Q2125 N, determine graphically the magnitude and direction of their resultant using (a) the parallelogram law, (b) the
triangle rule. “ ________________—___._____‘___.___—____—_——J SOLUTION
20°
32:15 N '
I
I E
4 s.
\ 35°
‘3
Using the triangle rule and law of sines:
Q 75 N
= = 44.7 N 1
(a) sin 20° sin35° Q a
(b) a+20°+35°=180°
a=180°——20°—35°
= 125°
R  75N R2107.1N4 sin125° ” sin35°
W—A ...
View
Full Document
 Fall '08
 Jenkins
 Statics

Click to edit the document details