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PROBLEM 3.131
A concrete foundation mat of 5-m radius supports four equally spaced
columns, each of which is located 4 m from the center of the mat.
Determine the magnitude and the point of application of the resultant of
the four loads.
PROBLEM 3.132
Determine the magnitude and the point of application of the smallest
additional load that must be applied to the foundation mat of Prob. 3.131
if the resultant of the five loads is to pass through the center of the mat.
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 3.133*
Three forces of the same magnitude P act on a cube of side a as
shown. Replace the three forces by an equivalent wrench and
determine (a) the magnitude and direction of the resultant force
R, (b) the pitch of the wrench, (c) the axis of the wrench.
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 3.134*
A piece of sheet metal is bent into the shape shown and is
acted upon by three forces. If the forces have the same
magnitude P, replace them with an equivalent wrench and
determine (a) the magnitude and the direction of the
resultant force R, (b) the pitch of the wrench, (c) the axis
of the wrench.
2
PROBLEM 3.134* (Continued)
PROBLEM 3.135*
The forces and couples shown are applied to two screws
as a piece of sheet metal is fastened to a block of wood.
Reduce the forces and the couples to an equivalent
wrench and determine (a) the resultant force R, (b) the
pitch of the wrench, (c) the point where the axis of the
wrench intersects the xz-plane.
PROBLEM 3.136*
The forces and couples shown are applied to two screws as a
piece of sheet metal is fastened to a block of wood. Reduce the
forces and the couples to an equivalent wrench and determine
(a) the resultant force R, (b) the pitch of the wrench, (c) the point
where the axis of the wrench intersects the xz-plane.
PROBLEM 3.136* (Continued)
PROBLEM 3.137*
Two bolts at A and B are tightened by applying the forces
and couples shown. Replace the two wrenches with a
single equivalent wrench and determine (a) the resultant
R, (b) the pitch of the single equivalent wrench, (c) the
point where the axis of the wrench intersects the xz-plane.
116 N
PROBLEM 3.137* (Continued)
