{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Quiz2 -...

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Your Recitation TA: _____________________________ Section Number: _____________________     Your NetID: __________________ Your Name: ________________________________________________  ENGRD 2020  Quiz # 2  Wed, Oct 21, 2009    Consider the structure shown below in static equilibrium. All members are  massless. Rigid member AB is vertical and has cross‐seciton area = 1cm2. The  coefficient of static friction between the ground and rigid member BCD is µ. Joints A  and B are pin‐joints. Load P is applied to member AB with its line of action along BC.  (Recall that sin(60°) = cos(30°) = √3/2 and sin(30°) = cos(60°) = 1/2).        B    P = 2N                  θ = 30°  C    D  A    µ = tan(30°) = 1/√3      (a) (6 points) Find friction force on member BCD.  (b) (6 points) The normal force exerted by member BCD on the ground is  distributed over the contact area. Is the resultant of this distributed normal  load on the left of C or on the right of C? Find its minimum magnitude.  (Note that the normal force is statically indeterminate, but you can find its  minimum magnitude).  (c) (6 points) Is the member AB in tension or compression?  (d)  (6 points) Assuming uniform stress distribution, find the minimal normal  stress developed in a cross‐section of member AB.      Your Recitation TA: _____________________________ Section Number: _____________________     Your NetID: __________________ Your Name: ________________________________________________  ENGRD 2020  Quiz # 2  Wed, Oct 21, 2009      ...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online