The ratio of the lift force L to the drag force D for the simple airfoil is L/D = 10. If the lift force on a short sect ion of the airfoil is 50 lb, compute the magnitude of the resultant force R and the angle 0 which it makes with the horizontal.

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The portable floor crane in the automotive shop is lifting a 350-lb engine. For the position shown compute the magnitude of the force supported by the pin at C and the oil pressure p against the 3.46-in.-diameter piston of the hydraulic-cylinder unit AB. Assume a = 7 in., b = 34 in., c = 17 in., e = 36 in., and θ= 32°.

The spring clamp of Fig. block Fagainst the floor. The force in the spring is F = k(e – lo), where e is the present length of the spring, lo = 3 in. is the unstretched length of the spring, and k = 240 lb/ft is the spring constant. Determine all forces acting on mem- ber ÁBC of the spring clamp and the force exerted by the spring clamp on the block E. is used to hold the 8 in. D E 8 in. 6 in -6 in.- 6 in.