Imagine an object is moving in one dimension on a number line, and for this we'll say that the numbers on the line are a metre apart. If the object moves from 2 m to 7 m, the change in position is 7-2=+5 metres. But if the object moves back from 7 m to 2 m, the change in position is 2-7=-5 metres. since 
, and time is always positive, velocity will be positive in one direction and negative in the other direction.
Both sections of rod ABC are circular and solid with diameters d 100 mm AB = and d 50 mm BC = . Determine the maximum shear stre
ss in the member and the angle of twist from A to C. Take the shear modulus of the material comprising the bar as G 32 GPa. = Torques are applied at the at the tail ends of the arrows.
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