I'll upload the answers if anyone request me via mehdishaheen005@gmail.com or +92-345-6024498 If I have get time then upload the answers booklet soon. :)

1. Engineering Mechanics 1 Lec: Engg. Naseer Kakar
Faculty of Engineering
Departmentof MiningEngineering
EngineeingMechanics
Instructor: Engr.NaseerKakar Date:18-01-2014
Submitted By:Ghulam Mehdi CMS ID# 23101
----------------------------------------------------------------------------------------------------------------
Q.No#01: Find the center of gravity of a semicircular section having
outer and inner diameters of 200 mm and 160 mm respectively as shown in fig?
Ans: 57.5 mm
Q.No#02: A semicircular area is removed from a trapezium as shown
in fig. Determine the position of the center of gravity?
Q.No#03:Find the center of gravity of an unequal angle section 10
cm x 16 cm x 2 cm?
Ans: 5.67 mm and 2.67 mm
Q.No#04:Find the center of gravity of T section with flange 150 mm
x 10 mm and web also 150 mm x 10 mm?
Ans: 115 mm
Q.N0#05:A semicircles of 90 mm radius is cut out from a

2. Engineering Mechanics 2 Lec: Engg. Naseer Kakar
trapezium as shown in fig. Find the position of the center of
gravity?
Center of the gravity = 69.1 mm
Q.No#06:Find the centroid of an unequal angle section 100 mm x
80 mm x 20mm.
Result x = 25 mm , y = 35 m
Q.No#07: A body of weight 6 lb rests on a horizontal table and the
coefficient of friction between the two surfaces is 0.32.
What horizontal force will be required to start the body
moving?
Ans: 1.92 lbs
Q.No#08: A block of wood weighing 3 lb. rests on a horizontal
table. A horizontal force 1.25 lb. is just sufficient to
cause it to slide. Find the coefficient of friction for the
two surfaces and the angle of friction ?
Ans: 0.42 & 22.6º
Q.No#09: A block having a mass of 220 Kg is resting on a wooden
Table.What is the minimum force necessary to impart
motion to the block when the coefficient of friction
between the block and the table is 0.25?
Ans:539 N
Q.No#10:A body of mass 100 Kg rests on horizontal plane the
co efficient of friction between body and the plane 0.40. Find
the work done in moving the body through a distance of 20 m
along the plane.?
Ans:Resultant weight = 748.8 N
Q.N0#11: A horse exerts a pull of 3 KN just to move a carriage
having a mass of 800 kg. Determine the co efficient of friction
between the wheel and the ground ?
Take g = 10 m/sec²

3. Engineering Mechanics 3 Lec: Engg. Naseer Kakar
Ans: Result co efficient of friction = 0.375
Q.No#12:Determine the tension in cables AB and AD for
equilibrium of the 250kg mass?
Q.No#13: Determine the moment of the force about point
“O” for following diagram?
(a) Result: - Moment = 200N.m Direction =clock wise
(b) Resultant Moment = 229.282 lb.ft Direction =clock wise
Q.No#14: Determine the moment of the force 800 N acting on the
frame about points A, B, C and D?

4. Engineering Mechanics 4 Lec: Engg. Naseer Kakar
Result: MA=2000 N.m clock wise Or MA = + 200 N.m ,
MB= 1200 N.m clock wise Or MB = + 1200 N.m ,Mc = O
MD =. 400 N.m anti clock wise MD= - 400N.m
Q.No#15: A 200 N force acts on the bracket as shown determine the
moment of force about “A”?
Q.No#16: Find the moment of the force about “O” as shown in
Diagram?
Q.No#17: Determine the resultant moment of four forces acting on
the rod about “O” as shown is diagram?
Ans: 333.92 N m clock wise
Q.No#18: The Force F acts at the end of angle bracket shown in fig.
Determine the resultant moment at point “O”?

5. Engineering Mechanics 5 Lec: Engg. Naseer Kakar
Ans : 98.56 CW
Q.No#19: A force of 40N is applied to the wrench. Determent the
moment at point “O”?
Ans: 7.107 CW
Q.No#20: The wrench is used to loosen the bolt. Determine the
moment of each force about the bolt’s axis passing
through point O?
(Ans: 24.1 N-m, 14.5 N-m)
Q.No#21: Determine the moment of each of the three forces about
point A?
Q.No#22: Determine the moment about point A of each of the three
forces

6. Engineering Mechanics 6 Lec: Engg. Naseer Kakar
Ans: 600 N-m, 1.12 KN-m, 518 N-m
Q.No#23: Calculate the moment of force 250 N on the handle of
monkey wrench?
Q.No#24: Calculate the magnitude of moment about base point O?
Q.No#25: Determine the moment of couple acting on the
moment shown?
…………………...With Best Luck…………………….
Regards: Mehdi Shaheen