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Unformatted text preview: EMf306 Test 2
ME. Mear 7/7/09 3 f5 [ OZ)
Problem 1: The top of the folding workbench has a mass of 50 kg with mass center at .
Calculate the x— and y—components of the force supported by the pin at E. - -------- ~' 750 mm M“ Problem 2: Blocks A and B are connected by a horizontal bar. The coefﬁcient of static
friction between the inclined surface and the 400-lb block A is 0.25. The coefﬁcient of
static friction between the surface and the 300-lb block B is 0.5. What force F is
necessary to cause the blocks to start sliding up the plane? Problem 3: The symmetrical crab hook is used to liﬁ packages by means of friction
developed between the shoes A and B and a package. The package has weight of W. (a) Determine the axial force in member CD.
(b) Determine the smallest coefﬁcient of static ﬁ‘iction at the shoes so that the package
does not slip. Problem 4:
a) Establish equations for the shear force and bending moment in term of x (i.e. V(x)
and M(x)) that are valid for 2m<x<5m.
b) Plot the shear force and bending moment diagrams for the beam and indicate all
signiﬁcant points and values. ...
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- Spring '08