What is the frictional HP acting on a collar loaded with 100 kg weight? The collar has an outside diameter of 100 mm and an internal diameter of 40mm. The collar rotates at 1000 rpm and the coefficient of friction between the collar and the pivot surface is 0.15.

The shaft is subjected to the axial force of 40 kN. Determine the average bearing stress acting on the collar C and the normal stress in the shaft. 

 A 2 cm diameter glass rd (k = 0.8 W/mK) is 6 cm long. It has base temperature at 120ºC 
and is exposed to air at 20ºC. The temperature at the tip of the rod is measured as 35ºC. 
What is the convection heat transfer coefficient? How much heat is lost by the rod?

the position of the 4 kg collar C on the smooth rod AB is held at r=0.72 m and L=0.3 m , determine the constant angular velocity (Theta) at which the mechanism is rotating about the vertical axis. The spring with k= 219 N/m has an unstretched length of 0.4 m. Neglect the mass of the rod and the size of the collar.

Angular Velocity (Theta) (in rad/s)

Answer