Kingdom of Saudi Arabia
Ministry of Higher Education
MIDTERM EXAM-1
Majmaah University
College of Engineering
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Academic Year:- 1432-1433 / 2011-2012 Term:- Even
Level:-4 (EE & CEN Old) Max. Marks: 20
Subject:-Statics
Date:- 14 th March 2012 / (21-4-1433H)
Subject Code:- 210 GE
Time:-8:00 - 10:00 a.m.
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Question 1.
Fill in the blanks: (4x1 = 4 Marks) a.
180 km/hour = .......................................m/s b.
25 lb = .........................kg = ...............................mg c.
Vector r = 2i+5j-12k m, vector F = 25i + 75k N. M o
=(r x F) =.............................N.m d.
Conditions for Static Equilibrium for Non-Concurrent Non-Parallel Force System are
---------------------------, ---------------------------, ------------------------------
Question 2.
Compute the x and y components of each of the four forces shown in figure 1
F
1x
, F
2x
, F
3x
, F
4x
, F
1y
, F
2y
, F
3y
, F
4y
? (4 Marks)
Figure -1
Question 3.
Calculate the Resultant force (F
R
) of the 4 forces acting on the bracket shown in figure-2.
(4Marks)
Figure-2
1

Question 4. For each case, determine the moment of the force about point O . (2x2= 4 Marks)
Question 5. Write the ONLY CORRECT ANSWER on answer sheet.
(4x1=4 Marks) a.
Using the CCW direction as positive, the net moment of the two forces about point P is
A) 10 N ·m B) 20 N ·m C) - 20 N ·m D) 40 N ·m E) - 40 N ·m
10
N b.
If r = { 5 j } m and F = { 10 k } N, the moment r x F equals { _______ } N·m.
A) 50 i B) 50 j C) –50 i D) – 50 j E) 0 c.
If r = {1 i + 2 j } m and F = {10 i + 20 j + 30 k } N, then the moment (r .
F) is --------------- N·m.
C) -40 D) None of the above. A) 50 B) -30 d.
In statics, a couple is defined as ___________________ separated by a perpendicular distance.
A) two forces in the same direction
B) two forces of equal magnitude
C) two forces of equal magnitude acting in the same direction
D) two forces of equal magnitude acting in opposite directions
-0O0-
2