Propped cantilever beam AB has moment M1 applied at joint B. Framework ABC has moment M2 applied at C. Both structures have constant flexural rigidity EI. If the ratio of the applied moments M1/M2 5 3/2, the ratio of the joint rotations at B, ?B1/?B2, is approximately:
(A) 1
(B) 3/2
(C) 2
(D) 5/2
(B) 3/2
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In powder fabrication of metals and ceramics, when the pressed powder part is sintered, the powder particles bond to each other, and voids are reduced by the ___________of atoms.
Fill in the blank(s) with the appropriate word(s).
If an object falls with constant acceleration, the velocity of the object must
A) be constant also. B) continually change by the same amount each second. C) continually change by varying amounts, depending on its speed. D) continually decrease. E) none of the above
Earth's atmosphere gets most of its heat from the
A) Sun. B) Earth's core. C) both of these D) neither of these
The images formed by concave lenses
A) are always virtual. B) could be real or virtual, but always real when the object is placed at the focal point. C) could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length. D) are always real.