C B H 1 ft -6 ft- G₂ 2 ft D 6 ft 8 ft The platform assembly has a weight of 250 lb that may be placed at its center of gravity, G₁ for analysis purposes. If it is intended to support a maximum load of 400 lb placed at G2, determine the smallest counter weight W that should be placed at B in order to prevent the platform from tipping over. The reactions at C and D are upwards.

The 100-lb door has its center of gravity at G. Determine the components of reaction at hinges A and B if hinge B resists only forces in the x and y directions and A resists forces in the x, y, z directions. 24 in. + 24 in. A 18 in. 18 in. 30⁰

A "scale" is constructed with a 4-ft-long cord and the 10-lb block DThe cord is fixed to a pin at 4 and passes over two small pulleys at B and C. Determine the weight of the suspended block at B if the system is in equilibrium when s1.5 ft. 2. ft 15 t Figure: 03_POB9

The 50-lb mulching machine has a center of gravity at G. Determine the vertical reactions at the wheels C and B and the smooth contact point A. X 4 ft 1.52 4 ft 1.25 ft 1.25 ft 1.52 1.25 ft 1.25 ft y