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英语翻译
A:The force of the earth,s gravitational pull acts vertically downwards on our bodies giving us weight.,wind forces,which can vary in magnitude,tend to push us horizontally,Force therefore possess magnitude and direction.At the same time,the effect of a force depends upon its position.For example,a door may be opened or closed by pushing horizontally at its free edge,but if the same force is applied at any point on the vertical line through its hinges ,the door will neither open nor close,Thus we see that a force is specified by its magnitude ,direction and position and is therefore a vector quantity.As shuch it must obey the laws of vector addition,which is a fundamental concept that may be verified experimentally.
B:`Frequently in civil engineering construction beams are fabricated from comparatively inexprnsive materials of strength which are reinforced by small amounts of high-strength material such as steel,in this way ,a timber beam of rectangular section may have steel plates bolted to its sides or to its top and bottom surfaces,Again,concrete beams are reinforce in their weak tension zones and also,if necessary,min their compression zones ,by steel reinforcing bars,The design of reinforced concrete beams and concrete-and-steel beams is covered by Codes and relies ,as in thd case of steel beams,ultimate load analysis.
A:The force of the earth,s gravitational pull acts vertically downwards on our bodies giving us weight.,wind forces,which can vary in magnitude,tend to push us horizontally,Force therefore possess magnitude and direction.At the same time,the effect of a force depends upon its position.For example,a door may be opened or closed by pushing horizontally at its free edge,but if the same force is applied at any point on the vertical line through its hinges ,the door will neither open nor close,Thus we see that a force is specified by its magnitude ,direction and position and is therefore a vector quantity.As shuch it must obey the laws of vector addition,which is a fundamental concept that may be verified experimentally.
B:`Frequently in civil engineering construction beams are fabricated from comparatively inexprnsive materials of strength which are reinforced by small amounts of high-strength material such as steel,in this way ,a timber beam of rectangular section may have steel plates bolted to its sides or to its top and bottom surfaces,Again,concrete beams are reinforce in their weak tension zones and also,if necessary,min their compression zones ,by steel reinforcing bars,The design of reinforced concrete beams and concrete-and-steel beams is covered by Codes and relies ,as in thd case of steel beams,ultimate load analysis.
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