Chapter 14.3, Problem 72P

For the beam and loading shown, determine the range of the distance a for which the reaction at B does not exceed 100 lb downward or 200 lb upward.

For the steel truss and loading shown, determine the magnitude of the force (lb) of member BD, knowing that  x = 12 ft, y = 7.2 ft,  and P = 22146 lb. Round off only on the final answer expressed in 3 decimal places .

A semicircular rod is loaded as shown. Determine the internal forces at point J knowing that 0== 30°.

The cable of the suspension bridge spans L=140m with a sag H=20m. The cable supports a uniformly distributed load of w0 N/m along the horizontal. If the maximum allowable force in the cable is 4 MN, determine the largest permissible value of w0.

The cable AB supports a uniformly distributed load of 12 lb/ft. Determine the angles A and B, and the cable tension at A.

In order to unscrew the tapped faucet A , a plumber uses two pipe wrenches as shown. By exerting a 40-lb force on each wrench at a distance of 10 in. from the axis of the pipe and in a direction perpendicular to the pipe and to the wrench, he prevents the pipe from rotating, and thus he avoids loosening or further tightening the joint between the pipe and the tapped elbow C . Determine (a) the angle 0 that the wrench at A should form with the vertical if elbow C is not to rotate about the vertical, (b) the force-couple system at C equivalent to the two 40-lb forces when this condition is satisfied.

For the beam and loading shown, determine the range of the distancea for which the reaction at B does not exceed 100 lb downward or 200 lb upward.

Three loads are applied as shown to a light beam supported by cables attached at B and D . Neglecting the weight of the beam, determine the range of values of Q for which neither cable becomes slack when P=O.

Knowing that the tension in cable AC is 300 lb, determine the smallest angle between cable AC and the boom AB. The smallest angle is?