Chapter 4, Problem 65P

Determine the moment of a force F=(0.5i-2.0j+7.0k) kN acting at A(5, -4, 0)m about axis BC where B (6,8,4)m and C (-6, -5,8)m. Also express the result in vector form. What is the prependicular distance between F and the axis BC?

Calculate the moment about point O of the 200-lb force that lies in the X-Y plane shown below. Solve the force into rectangular components at point M. X(-)- Fy Y(+) Y(-) 2'-0" M F 3'-0" 30° F = 200 lb X(+)

4–7. Determine the moment of each of the three forces about point A. *4-8. Determine the moment of each of the three forces about point B. F2 = 300 N F = 250 N 30| 60 -2 m- -3 m- 4 4 m B F3 = 500 N

Determine the moment of all the forces about C & D. Take AB = CD = 3 m H1 = H2 = 7 m, F1 = F2 = 3 N. F3 = F4 9N. and e 30°. F1 H1 H2

*3–4. If 0 = 45", determine the moment produced by the 4-kN force about point A. 3 m 0.45 m 4 kN

1. Determine the magnitude of the moment of the 200-N force about the x axis. Solve 0.3 m F= 200 N the problem using both a scalar and a 45 vector analysis. 120 60 0.25 m 2. The chain AB exerts a force of 20 lb on the 3 ft door at B. Determine the magnitude of the 2 ft moment of this force along the hinged axis x of the door. F= 20 lb B. 4 ft 3 ft 20°

The 4.1-lb force is applied at point A of the crank assembly. Determine the moment of this force about point O. F = 4.1 lb 26 1.00" --y 1.80". j+ k) Ib-in. i+ Answer: Mo = (|

Q1: The 100-N force is applied as shown to one end of the curved wrench. If a = 55°, calculate the moment of F about the center O of the bolt. F=100N -A 70 mm 25 mm 150M 70 mm 25 mm

3-67. If 5 - 100 N, 5 - 120N, and 5 - 80 N, determine the magnitude and coordinate direction angles of the resultant couple moment. F, =[-150 k] N 0.3 m -30 0.2 m = [150 k] N 0.2 nf 02m 0.2 m