Random Problems Flashcards
A solid steel shaft, 8 m long, 100 mm in diameter is subjected simultaneously to an axial compressive force of 600 kN and
a torque T that twists the shaft through 1.5°. If the shear modulus of steel is 80 GPa, find the following: The torque T in
kN·m acting on the shaft.
A. 2.57
B. 1.36
C. 1.47
D. 4.78
A
A water tank 3m in diameter and 6m high is made from a steel having a thickness of 12mm. When the tank is filled with
water, determine the circumferential stress.
A. 7.36 MPa
B. 14.72 MPa
C. 3.7 MPa
D. 9.57 MPa
A
A hollow right circular cylinder is made of cast iron and has an outside diameter of 75 mm and an inside diameter of 60
mm. If the cylinder is loaded by an axial compressive force of 50 kN, determine the total shortening, in mm, in a 600 -mm
length. Take the modulus of elasticity to be 100 GPa and neglect any possibility of lateral buckling of the cylinder.
a. 0.189
b. 0.068
c. 1.128
d. 1.698
A
1 micrometer um is equals to how many meter?
1,000,000 m
Steel railroad rails 10 m long are laid with a clearance of 3 mm at a temperature of 15°C. At what temperature, in oC, will
the rails just touch? Use coefficient of linear expansion for steel is α= 11.7 μm/(m·°C) and E = 200 GPa. Clue: ΔL =
αLΔT
a. 42.88
b. 21.44
c. 40.64
d. 27.82
C
If a solid circular shaft of 1.25 in diameter is subjected to a torque T of 2500 Ib-in causing an angle of twist of 3.12 in
a 5 ft length. Determine the shear modulus of the material in × 103
Ib/in2
. A. 200.58
B. 401.16
C. 11.5
D. 22.90
C
A simply supported rectangular beam, 50 mm wide by 100 mm deep, carries a uniformly distributed load of 1.20
kN/m over its entire length. What is the maximum length of the beam if the flexural stress is limited to 21 MPa?
A. 2.8 m
B. 3.4 m
C. 4.2 m
D. 4.6 m
B
The weight of a certain crown in air was found to be 14.0 N and its weight in water is 12.7 N.
Determine the volume of the crown in m^3.
A 0.0001325
B. 0.0001202
C. 0.0001529
D. 0.0001136
A
A 200N block rest on a horizontal rough surface. It is being pulled by a constant force of 50N 30° from horizontal. The
block is initially at rest, attained a velocity of 10 m/s after travelling 40m . Which of the following most nearly gives the acceleration of the block during the first 40 m of the motion in m/s2?
A. 1.55
B. 1.25
C. 1.85
D. 2.15
B
Compute the BHP of a pump needed to pump out a fluid (p=1.3 g/cc) at a rate of 300 gpm with a total head of 6 meters. Assume pump efficiency of 60%.
(A). 2.5 hp
(B). 3 hp
(C). 3.5 hp
(D). 5 hp
C
A solid steel shaft, 8 m long, 100 mm in diameter is subjected simultaneously to an axial compressive force of 600 kN and
a torque T that twists the shaft through 1.5°. If the shear modulus of steel is 80 GPa, find the following: The torque T in
kN·m acting on the shaft.
A. 2.57
B. 1.36
C. 1.47
D. 4.78
A
Timbers 12 in by 12 in, spaced 3 ft apart on centers, are driven into the ground and act as cantilever beams to back up
the sheet piling of a cofferdam. Water weighs = 62.5 lb/cu.ft. Calculate the maximum moment timber can resist if its
allowable flexural stress is 1200 psi.
A. 34.56 kip-ft
B. 28.80 kip-ft
C. 33.33 kip-ft
D. 26.54 kip-ft
B
