978-0073398242 Chapter 4 Solution Manual Part 20

PROBLEM 4.142

A 3200-lb forklift truck is used to lift a 1700-lb crate.

Determine the reaction at each of the two (a) front wheels A,

(b) rear wheels B.

PROBLEM 4.143

The lever BCD is hinged at C and attached to a control rod at B. If

P  100 lb, determine (a) the tension in rod AB, (b) the reaction at C.

PROBLEM 4.144

Determine the reactions at A and B when (a) 0,h

(b)

200 mm.h

PROBLEM 4.145

Neglecting friction and the radius of the pulley,

determine (a) the tension in cable ADB, (b) the reaction

at C.

PROBLEM 4.146

Bar AD is attached at A and C to collars that can move

freely on the rods shown. If the cord BE is vertical (



 0),

determine the tension in the cord and the reactions at A and

C.

PROBLEM 4.147

A slender rod AB, of weight W, is attached to blocks A and B

that move freely in the guides shown. The constant of the spring

is k, and the spring is unstretched when

0.





(a) Neglecting the

weight of the blocks, derive an equation in W, k, l, and



that

must be satisfied when the rod is in equilibrium. (b) Determine

the value of



when 75 lb,W 30 in.,l and

3 lb/in.k

PROBLEM 4.148

Determine the reactions at A and B when a  150 mm.

PROBLEM 4.149

For the frame and loading shown, determine the reactions at A and C.

PROBLEM 4.150

A 200-mm lever and a 240-mm-diameter pulley

are welded to the axle BE that is supported by

bearings at C and D. If a 720-N vertical load is

applied at A when the lever is horizontal,

determine (a) the tension in the cord, (b) the

reactions at C and D. Assume that the bearing at

D does not exert any axial thrust.

PROBLEM 4.151

The 45-lb square plate shown is supported by three vertical

wires. Determine the tension in each wire.