 #1
Femme_physics
Gold Member
 2,547
 1
The X axis in the first diagram is in line with the surface, but when you isolate BC it doesn't have to be. Notice how when we isolate BC our angles our different. Who's correct?
http://img192.imageshack.us/img192/236/objectthingy.jpg [Broken]
The object is in static equilibrium.
Static Coeffecient between the box and surface: 0.3
Weight of box: 500 [N]
Measurements in mm
Joints are smooth pin.
Do the calculations as the box about to descend down the surface
Ignore the weight of lever AC
Calculate:
Force at AB
The moment around C, acting on the arm BC
I got Fab correct (in the solution manual they call it "S"). However, we have our differences at beam BC about the angle, which I'd like you to help me resolve. The manual thinks it's 20 degrees, I think it's 50 degrees. Attached my attempt and the solution manual's.
Homework Statement
http://img192.imageshack.us/img192/236/objectthingy.jpg [Broken]
The object is in static equilibrium.
Static Coeffecient between the box and surface: 0.3
Weight of box: 500 [N]
Measurements in mm
Joints are smooth pin.
Do the calculations as the box about to descend down the surface
Ignore the weight of lever AC
Calculate:
Force at AB
The moment around C, acting on the arm BC
The Attempt at a Solution
I got Fab correct (in the solution manual they call it "S"). However, we have our differences at beam BC about the angle, which I'd like you to help me resolve. The manual thinks it's 20 degrees, I think it's 50 degrees. Attached my attempt and the solution manual's.
Attachments

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