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ACTIVITY NO.4
PRACTICE PROBLEMS
PROBLEM NO.1
Locate the centroid of the wire shown in the figure below:
PROBLEM NO.2
Locate the centroid of the plate area as shown in the Figure:
PROBLEM NO.3
PROBLEM NO. 4
PROBLEM NO. 5
PROBLEM NO.6
The tractor exerts a towing force T = 400 lb. Determine the maximum force P the connection can
support so that no slipping occurs between the plates. There are four bolts used for the connection
and each is tightened so that it is subjected to a tension of 4 kN. The coefficient of static friction
between the plates is 0.4
PROBLEM NO.7
The mine car and its contents have a total mass of 6 Mg and a center of gravity at G. If the coefficient
of static friction between the wheels and the tracks is 0.4 when the wheels are locked, find the normal
force acting on the front wheels at B and the rear wheels at A when the brakes at both A and B are
locked. Does the car move?
PROBLEM NO. 8
Draw the shear and moment diagram as shown in the figure.
PROBLEM NO. 9
Draw the shear and moment diagram as shown in the figure.
PROBLEM NO. 10
Determine the force of each member as shown in the figure. Indicate whether the members are in
tension or compression.