If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either__________________?

A. equal
B. proportional to their respective moduli of elasticity
C. inversely proportional to their moduli of elasticity
D. average of the sum of moduli of elas-ticity
E. none of the above

A. breaking stress
B. maximum load/original cross-sectional area
C. load at breaking point/A
D. load at breaking point/neck area
E. maximum stress

A. downwards at its upper end
B. upwards at its upper end
C. perpendicular to the wall at its upper end
D. zero at its upper end
E. none of the above

A. same
B. more
C. less
D. may be less of more depending on nature of surfaces and velocity
E. has no correlation

A. thermal stresses
B. tensile stress
C. bending
D. compressive stress
E. no stress

A. load/original cross-sectional area and change in length/original length
B. load/instantaneous cross-sectional area original area and log
C. load/instantaneous cross-sectional area and change in length/original length
D. load/instantaneous area and instantaneous area/original area
E. none of the above