Science & Mathematics » Physics » Physics question: Determine the net torque on the 3.2-m-long uniform beam shown in the figure. All forces are shown. (Figure 1)?

# Physics question: Determine the net torque on the 3.2-m-long uniform beam shown in the figure. All forces are shown. (Figure 1)?

Determine the net torque on the 3.2-m-long uniform beam shown in the figure. All forces are shown. (Figure 1)

https://session.masteringphysics.com/problemAsset/1697069/4/Giancoli7.ch8.p29.jpg

A) Calculate about point C, the CM. Take counterclockwise torques to be positive.

B) Calculate about point point P at one end. Take counterclockwise torques to be positive.

• F1y = 56*cos 32 = 47.49 N
F1x = 56*sen 32 = 29.68 N

F2x = -32.5√2 N
F2y = 32.5√2 N

F3x = 52*cos32 = 44.10 N
F3y = -52*sin 32 = -27.56 N

around point C
F2 has 0 arm ..so it is uneffective
Mc = ℓ/2*(F1x-F3x) = 1.6*(29.68-44.10) = -23.1 Nm (i.e. ccw according to cartesian plan and posive according to your definition)

arounf point P
F3 has 0 arm ..so it is uneffective
Mp = (ℓ*F1x+ℓ/2*F2x) = (3.2*29.68-1.6*32.5√2) = 21.4 Nm (i.e. cw according to cartesian plan and negative according to your definition)
1
0