Row Angular
Row Angular
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Need to find minimum coefficient of static friction, angular speed, and time?
I have a graph to fill in. I need the proper equations to fill in the last 3 columns. What I need is the Min u_s, angular speed (r/s), and time (s). What I have is mass (kg), speed (m/s), radius (m), speed (mi/hr), and force friction (N). For example, the first row in the chart consists of this:
Mass(kg) 2000
Speed (m/s) 50
Radius (m) 100
Speed (mi/hr) 112
Force friction (N) 50,000
Min u_s blank(?)
Angular Speed (r/s) blank(?)
Time (s) blank (?)
How can I fill in the final 3 columns of the graph?
I guess its a "table" rather than a "graph" you have to fill in.
The Angular Speed in rev/s or rad/sec is the easiest:
r = 100m
So 1 revolution = circumference of circle = 2pi*r = 2pi*100m = 628m
Tangential speed v = 112 mi/h = 50 m/s
So angular speed w = v / 2pi*r = 50 m/s / 628 m = 0.0796 rev/s
or in radians/sec w = v / r = 50 / 100 = 0.5 rad/s
Min u_s is a bit harder.
The centripetal force is f = m*v^2 / r = 2000*50^2 / 100 = 50000 N
which is the same as the friction force.
So the Min u_s = 1.0 ??
The Time is the hardest of all. Time for what?
The only Time that can be readily calculated is the rotation period time, which is:
T = 1 / w (rev/s) = 12.6 s
Hope this helps 
Tags: double row angular contact, row angular contact ball bearings