The bodies A and B in Fig. P 10-22 each weigh 32.2 lb and are connected by a rig

Question

The bodies A and B in Fig. P 10-22 each weigh 32.2 lb and are connected by a rigid bar whose mass may be neglected. The two planes are smooth and the velocity of A is 5.0 fps to the right in the position shown. Determine the acceleration of A at this instant. (Note: Since the mass of AB is neglected, it is a two-force member) Fig. P10-22 The car in Fig. P-10-25 is traveling around a 5-degrcc horizontal curve (radius = 1146 ft) at a constant speed. The safe permissible resistance to transverse sliding around the curve is 0.14 of the normal force. Determine the minimum superelevation necessary for a design speed of 60 mph. (Note: Present highway practice suggests a maximum superelevation of 0.12 ft per foot.) Fig. P 10-25

Explanation / Answer

10-26)
let the frictional force be f newtons and the normal force be N newtons,
so resolving these two force along the horizontal and vertical directions,
Nsin-fcos=mv^2/r

Ncos+fsin=mg

f=N

where is the coefficient of friction,v is the maximum permissible velocity,m is the mass of the car.

well i am not very familiar with the feet system for measurement , so i will leave the calculation part onto you.

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