Chapter 4, Problem 15P

The trap door is held open by the rope AB. If the tension in the rope is T = 60 lb, determine its moment about the y-axis.

The 6.4-kN force F is applied at point A. (a) Compute the moment of F about point O, expressing it both as a scalar (positive if CCW, negative if CW) and as a vector quantity. (b) Determine the coordinates of the points on the x- and y-axes about which the moment of F is zero. Assume XA = 0.8 m, yд = 1.2 m, a = 7, b = 11. y, m I 1 A (x, y) F b a -x, m

Calculate the moment of the force P about the axis AD using (a) point A as the moment center; and (b) point D as the moment center. 6 ft D 3 ft P = 240 lb 2 ft B E y 5 ft -8 ft- A

please make it clear and box the answer

Q3/ The 30-N force P is applied perpendicular to the portion BC of the bent bar. Determine the moment of P about point B and about point A (in two different ways). P = 30 N C 1.6 m 45° 1.6 m

tion The horizontal force F acts on the handle of the wrench (i.e F is parallel to xy-plane). What is x-component of the moment of this force about the origin "O"? F = 19.5 N, a = 36 mm, b = 200 mm, c = 10 mm, 0 = 30°. ut of B a

Determine the moment of the force in Fig. 4-18a about point O. y. 75 d, 3 cos 30 m 45 F (5 kN) cos 45 30 3 m F-SkN d, 3 sin 30 m 30 F, = (5 kN) sin 45 (a) (b)

A force F of magnitude 53 N is applied to the gear. Determine the moment (positive if counterclockwise, negative if clockwise) of F about point O. Assume r = 150 mm, 0 = 16°.

The turnbuckle is tightened until the tension in cable AB is 2.9 kN. Calculate the magnitude of the moment about point O of the force acting on point A. 2.4 m Answer: M = A 1.9 m 2.0 m Z B 0.5 m kN·m