1) How are the shear modulus of Elasticity G, and the Young Modulus, E, related
ID: 1712652 • Letter: 1
Question
1) How are the shear modulus of Elasticity G, and the Young Modulus, E, related
(A) G is directly proportional to E. (B) G increases with increasing E, but not directly (c) G varies inversly with E (d) G decreases with increasing E but not directly
(2) which of the following stresses is negleted in the analysis of thin-walled cylindrical tanks, but not thick-walled tanks
(a) radial (b) longitudinal (c) circumferencial (d) hoop
(3) Assume the radius of the earth is 6400 km and gravity at a height of 200 km is 9.2 m/s2. A satellite orbits the earth 200 km above the surface. The speed necessary for a circular orbit is most nearly
(A) 6000 m/s (b) 6600 m/s (c) 7200 (d)7800
(4) What must be true for the center of gravity of an object to coincide with the object’s center of mass?
( I )..The gravitational field must be constant over the volume of the object.
( II )..The object must be symmetrical about three axes.
( III )..The object must have constant density
(A) I only .......(B) I and II .... (C) II and III .... . (D) I, II and III
Explanation / Answer
1) A) G is Directly proportional to E
G = E / (1+2*poisson's ratio)
2) A) Radial
In thin pressure vessels, Radial stresses are much smaller than the longitudinal and hoop (circumferential) stresses, hence negelcted
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