The designers of lamp mechanisms, such as that shown in the figure, usually rely on joint...

 

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The designers of lamp mechanisms, such as that shown in the figure, usually rely on joint friction to aid in maintaining static equilibrium. For the pres- ent problem, assume that sufficient friction exists at point C to prevent rotation there, but ignore fric- tion at all other joints. If the mass of the lamp fix- ture is 0.6 kg with mass center at G, determine the spring force Fs necessary for equilibrium in the position shown. www. 225 mm E 65 mm 15° 225 mm Problem 4/117 60 60 mm mm B D C G The designers of lamp mechanisms, such as that shown in the figure, usually rely on joint friction to aid in maintaining static equilibrium. For the pres- ent problem, assume that sufficient friction exists at point C to prevent rotation there, but ignore fric- tion at all other joints. If the mass of the lamp fix- ture is 0.6 kg with mass center at G, determine the spring force Fs necessary for equilibrium in the position shown. www. 225 mm E 65 mm 15° 225 mm Problem 4/117 60 60 mm mm B D C G

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Solution Handwriting solution Draw the free body diagram of the system D mg cos15 0 D 06 981 cos15 D ... View the full answer