题目内容
（请给出正确答案）
For the cantilever beam with length l, the deflection at the free end is
. If the beam length is reduced to one half of its original length, then the deflection at the free end should be
A、
B、
C、
D、
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A.
B.
C.
D.
For the cantilever beam with length l, the deflection at the free end is
. If the beam length is reduced to one half of its original length, then the defection at the free end should be
A、
B、
C、
D、
A.
B.
C.
D.
A.12.7 
B.14.2
C.16.1
D.18.5
A.For point 1:
B.For point 2:
C.For point 3:
D.For point 4:
A cantilever beam is loaded as shown in the figure. The bending moment at 0.5 m from the support is approximately:
A、12.7 kN·m
B、14.2 kN·m
C、16.1 kN·m
D、18.5 kN·m
A.For point 1:
B.For point 2:
C.For point 3:
D.For point 4:
A cantilever beam AB of an isosceles trapezoidal cross section has a length L = 0.8 m , dimensions
= 80 mm and
= 90 mm , and height h =110 mm (see figure). The beam is made of brass weighing 85 kN/m 3 . (a) Determine the maximum tensile stress
and maximum compressive stress
due to the beam’s own weight. (b) If the width
is doubled, what happens to the stresses？ (c) If the height h is doubled, what happens to the stresses？
In section B of the cantilever beam shown,
A、there is a jump in the shear force diagram, and the bending moment diagram is continuous and smooth.
B、there is a sudden slope change in the shear force diagram and jump in the bending moment diagram.
C、there is a jump in both the shear force diagram and the bending moment diagram.
D、there is no jump in the shear force diagram, but there is a jump in the bending moment diagram.
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