3 Determine the moment about the yaxis of the force F 200i

3 Determine the moment about the y-axis of the force F = 200i +400j acting at (4,-6,4) a) 0 b) 200 c) 400 d) 800 4 What total moment do the two forces F acting at (2, 0,-4) and (-4, 2, 0), respectively, produce about the x-axis? a) 0 501-40k and F2 = 60j + 80k b) 80 c) 160 d) 240 The force system shown may be referred to as being a) non-concurrent, 5 2 non-coplanar b) coplanar c) parallel d) two-dimensional 45° 100 N 200 N (x-y plane) x 200N 6 If equilibrium exists due to a rigid support at A in the figure of Prob.5, what reactive force must exist at A? a) -59i-141j+10k b) 59i +141j+100k c) 341i-141j-100k d) 341i+141j-100k 7 If equilibrium exists on the object in Prob. 8.5, what reactive moment must exist at the rigid support A? a) 600i+400j+5641k b) 400i +564k c) 400i-600j+564k d) 400i-600j

Solution

3)Given force acting is 200i+400j acting at (4,-6,-4)

moment about y-axis = 200*4=800 units

Correct option is d