ENGINEERING MECHANICS DYNAMICS
CERTIFICATION EVALUATION EXAMS SET
FULL QUESTIONS AND COMPLETE
SOLUTION
●● 2. A rope is stretched between two rigid walls 40 feet apart. At the
midpoint, a load of 100 lbs was placed that caused it to sag 5 feet.
Compute the approximate tension in the rope.
A. 206 lbs
B. 150 lbs
C. 280 lbs
D. 240 lbs
Answer:
●● 3. What is the effective component applied on the box that is being
pulled by a 30 N force inclined at 30 degrees with horizontal?
A. 36.21 N
B. 25.98 N
C. 15.32 N
D. 20.62 N
Answer:
,●● 4. A post is supported by a guy wire which exerts a pull of 100 N on
the top of the post. If the angle between the wire and the ground is 60
degrees, what is the horizontal component of the force supporting the
pole?
A. 86.6 N
B. 50.0 N
C. 76.6 N
D. 98.5 N
Answer:
●● 5. The resultant of two forces in a plane is 400 N at 120 degrees. If
one of the forces is 200 lbs at 20 degrees what is the other force?
A. 347.77 N at 114.85 degrees
B. 435.77 N at 104.37 degrees
C. 357.56 N at 114.24 degrees
D. 477.27 N at 144.38 degrees
Answer:
●● 6. Determine the resultant of the following forces: A = 600 N at 40
degrees, B = 800 N at 160 degrees and C = 200 N at 300 degrees.
A. 532.78 N, 55.32 degrees
B. 435.94 N, 235.12 degrees
C. 522.68 N, 111.57 degrees
, D. 627.89 N, 225.81 degrees
Answer:
●● 7. A collar, which may slide on a vertical rod is subjected three
forces. Force A is 1200 N vertically upward, Force B is 800 N at an
angle of 60 degrees from the vertical and a force F which is vertically
downward to the right. Find the direction of F if its magnitude is 2400 N
and the resultant is horizontal.
A. 41.61 degrees
B. 43.52 degrees
C. 40.13 degrees
D. 45.52 degrees
Answer:
●● 8. Given the 3-dimensional vectors: A = i(xy) + j(2yz) + k(3zx) and
B = i(yz) + j(2zx) + k(3xy). Determine the scalar product at the point
(1,2,3).
A. 144
B. 138
C. 132
D. 126
Answer:
CERTIFICATION EVALUATION EXAMS SET
FULL QUESTIONS AND COMPLETE
SOLUTION
●● 2. A rope is stretched between two rigid walls 40 feet apart. At the
midpoint, a load of 100 lbs was placed that caused it to sag 5 feet.
Compute the approximate tension in the rope.
A. 206 lbs
B. 150 lbs
C. 280 lbs
D. 240 lbs
Answer:
●● 3. What is the effective component applied on the box that is being
pulled by a 30 N force inclined at 30 degrees with horizontal?
A. 36.21 N
B. 25.98 N
C. 15.32 N
D. 20.62 N
Answer:
,●● 4. A post is supported by a guy wire which exerts a pull of 100 N on
the top of the post. If the angle between the wire and the ground is 60
degrees, what is the horizontal component of the force supporting the
pole?
A. 86.6 N
B. 50.0 N
C. 76.6 N
D. 98.5 N
Answer:
●● 5. The resultant of two forces in a plane is 400 N at 120 degrees. If
one of the forces is 200 lbs at 20 degrees what is the other force?
A. 347.77 N at 114.85 degrees
B. 435.77 N at 104.37 degrees
C. 357.56 N at 114.24 degrees
D. 477.27 N at 144.38 degrees
Answer:
●● 6. Determine the resultant of the following forces: A = 600 N at 40
degrees, B = 800 N at 160 degrees and C = 200 N at 300 degrees.
A. 532.78 N, 55.32 degrees
B. 435.94 N, 235.12 degrees
C. 522.68 N, 111.57 degrees
, D. 627.89 N, 225.81 degrees
Answer:
●● 7. A collar, which may slide on a vertical rod is subjected three
forces. Force A is 1200 N vertically upward, Force B is 800 N at an
angle of 60 degrees from the vertical and a force F which is vertically
downward to the right. Find the direction of F if its magnitude is 2400 N
and the resultant is horizontal.
A. 41.61 degrees
B. 43.52 degrees
C. 40.13 degrees
D. 45.52 degrees
Answer:
●● 8. Given the 3-dimensional vectors: A = i(xy) + j(2yz) + k(3zx) and
B = i(yz) + j(2zx) + k(3xy). Determine the scalar product at the point
(1,2,3).
A. 144
B. 138
C. 132
D. 126
Answer:
