mohon dijawab no. 8

sumbu x
Rx = F1 + -F2. sin 45 drjat
= 30 +(-10akar2.sin 45 drjat)
= 30 + (-10 akar2 . 1/2akar 2)
= 30 + -10
= 20 N
sumbu y
Ry = F2 sin 45 +(-F3)
= 10akar2 . 1/2akar2 +(-30)
= 10 + (-30)
=-20
Rtotal = akar Rx^2+Ry^2
= akar20^2 +(-20)^2
= akar 800
= 28,2 N