Chapter 11, Problem 22P

The 1200-lb homogeneous block is placed on rollers and pushed up the 10 incline at constant speed. Determine the force P and the roller reactions at A and B.

The homogeneous cylinder of weight W = 100N rests in a frictionless right-angled corner. Determinethe contact forces NA and NB if θ = 30°.

Determine the maximum weight of the oil barrel that the floor crane can support without falling and find the reactions at the smooth wheels A, B, and C for that case. The floor lift has a weight of 300 lb and its center of gravity is located at G.

2) The truck and the tanker have weights of 8000 lb and 20000 lb, respectively. Their respective centers of gravity are located at points G, and G2. If the truck is a rest, determine the reactions on wheels at A, B, and C. The tanker is connected to the truck at the turntable D. -15 ft- B -10 ft--9 ft- 5 ft

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The machine shown is used for moving heavy items such as pallets of bricks around construction sites. Determine the force in the single hydraulic cylinder CD (positive if in tension, negative if in compresssion). The mass of the cube of bricks is 1980 kg with mass center at G2. You may neglect the effects of the mass of the forklift components. Assume a = 770 mm, b = 185 mm, c = 500 mm, d = 45 mm, e = 810 mm. a E- D e d Answer: CD = i ! kN

7. The crane's arm has a pin support at A, and the hydraulic cylinder BC exerts an axial force on the arm at C. If the crane's arm has mass = 200 kg as shown, and the suspended box has mass=800 kg, what is the magnitude of the force exerted by the hydraulic cylinder? 2.4 m 1m 200 kg 2 m B 1.8 m 1.2 m C O -7 m 800 kg

The woman is trying to move the crate of weight W by pulling on the rope at the angle to the horizontal. Find the smallest possible tension that would cause the crate to slide and the corresponding angle .

The center of gravity of the 3000-lb car is at G. The car is parked on an incline with the parking brake engaged, which locks the rear wheels. Find (a) the normal forces (perpendicular to the incline) acting under the front and rear pairs of wheels; and (b) the friction force (parallel to the incline) under the rear pair of wheels.