GARCIA COLLEGE OF TECHNOLOGY
Kalibo, Aklan
Electrical Engineering Department
ENGINEERING COMPETENCE II (ENGINEERING SCIENCES AND ALLIED SUBJECTS)
REVIEW MODULE – ENGINEERING MECHANICS
1. A concrete block is supported by two guy wires attached to an Given data: a = 1m; P1 = 1.8 kN, P2= 0.45 kN; = 30, = 45
anchor ring as shown: a. Determine the resultant of the three forces P1, P2, and P3.
b. Determine the vertical reaction at B.
c. Determine the horizontal reaction at B.
(2.45 kN, 1.07 kN, 0 kN)
4. A load W is to be lifted using the crane which is hinged at B as shown.
The value of x1 = 10 m, x2 = 8 m, and h is 18 m. Neglecting the weight of
the crane, determine
Determine the following:
a. Resultant force on the anchor ring
b. Angle of resultant force with respect to horizontal
c. Weight W of the concrete block with a factor of safety of
a. Force of cable AC
1.25 to prevent uplift.
b. Resultant reaction B
(5.156 kN, 43.7, 4.45 kN)
c. Largest load that can be lifted if the maximum load of cable AC
is 50 kN
2. The hook is subjected to three forces A, B, C as shown. (22.65 kN, 39.4 kN, 44.15 kN)
5. The total load W is to be lifted using the machine hinged at B. The
mast is of uniform section and weighs 8 kN.
a. If the resultant of the forces is 80 kN and is acting along
positive x-axis, solve .
b. If = 60, what is the value of force C such that resultant
acts along x-axis? a. What is the tensile force in the cable AC is W=36 kN
c. For forces A, B, C to be equilibrium, what is the magnitude b. What is the vertical reaction at B if W=36 kN
c. If allowable tensile force in the cable AC is 45 kN, what is the
of resulting force C?
maximum load that can be lifted
(22.85, 45 kN, 40.9 kN)
(33.3 kN, 64 kN, 50 kN)
3. From the figure below,
6. Figure shows a circular steel plate supported on 3 posts A, B, and C
which are equally spaced along its circumference. A load W=1350 N is at
a distance x = 0.5 m from the post at A along x-axis. Diameter of steel
plate is 1.8 m. Compute
a. reaction at post A. Neglect weight of steel plate.
b. reaction at post B. Neglect weight of steel plate.
c. reaction at C considering the weight of the plate if it has a
thickness of 16 mm and has a unit weight of 77 kN/m3.
(850 N, 250 N, 1295 N)
Page 1 of 2
7. Three identical cylinders are stacked within a rigid bin as shown.
Weight of each cylinder is 500 N. There is no friction at any contact
surface. Compute
a. reaction at A
b. reaction at B
c. reaction at C
(288.7 kN, 750 kN, 144.34 kN)
8. A 150 kg man stands on the middle rung of a 50 kg ladder as shown.
Assuming the floor and wall are perfectly smooth and that slipping is
prevented by a string DE. Compute
a. reaction at B
b. reaction at A
c. tension in the string DE
(2360.3 N, 689.64 N, 796.4 N)
Page 2 of 2
