题目内容
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It is often observed that the aged spend much time thinking and talking about their past l
As the life cycle【C11】______to its close, the aged must also learn to accept the reality of their own impending(即将发生的)death,【C12】______this task is made difficult by the fact that death is almost a【C13】______subject in the United States. The mere discussion of death is often regarded as【C14】______. As adults many of us find the topic frightening and are【C15】______to think about it--and certainly not to talk about it【C16】______the presence of someone who is dying. Death has achieved this taboo【C17】______only in the modern industrial societies. There seems to be an important reason for our reluctance to 43 the idea of death. It is the very fact that death re- mains【C19】______our control; it is almost the only one of the natural processes【C20】______is so.
【C1】
A．better than
B．rather than
C．less than
D．other than
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= 0.0024. what is the shortest length L of wire that can be used? (b) If L=5.5 m , what is the maximum acceptable diameter of the wire if the maximum normal strain must remain below yield? Assume E =120 GPa and
=300 MPa.
with maximum intensity
at B. The beam has a length L = 4 m and rectangular cross section with a width of 200 mm and height of 300 mm. Determine the maximum permissible value for the maximum intensity,
at the top and bottom of the bar? (b) If allowable strain
= 0.0006 and the deflection cannot exceed 4.3 mm, what is the maximum permissible length of the bar?
due to the load q if the beam has a rectangular cross section with width b =140 mm and height h =240 mm . (b) Repeat part (a) but use the trapezoidal distributed load shown in the figure part b.
= 500 mm (see fgure). (a) What is the maximum stress
in the wire? (b) By what percent does the stress increase or decrease if the radius of the pulley is increased by 25%? (c) By what percent does the stress increase or decrease if the diameter of the wire is increased by 25% while the pulley radius remains at
=500 mm ?
in the beams, assuming that the weight density of water is
.
at its free end (see fgure). The length of the beamis L=2.0 m , and the longitudinal normal strain at the top surface is
=0.0010 . The distance from the top surface of the beam to the neutral surface is c =85 mm . (a) Calculate the radius of curvature
, the curvature
, and the vertical deflection
at the end of the beam. (b) If allowable strain
=0.0008 , what is the maximum acceptable depth of the beam? [Assume that the curvature is unchanged from part(a)]. (c) If allowable strain
