Given x = 67 and y = 18, use two's complement to calculate:(1)x+y (2) x-y (3)-x+y (4)-x-y. Do the calculation, show the results in 8­-bit two's complement binary form first, then convert the results into decimal (For negative decimal numbers enter a minus sign. For positive decimal numbers, however, do NOT enter a plus sign).

(a) x + y =
(b) x - y =

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false

When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?

Plot schematically the tensile stress versus strain curves for a typical thermoplastic material at a temperature below its glass transition temperature (tg and at a temperature above its tg, respectively. do the same for a typical thermosetting material. list in a table any differences or similarities between the two materials at t> tg and t < tg, respectively, and relate them to the structures of the two types of polymers