Let’s say I have two cylindrical segments of polymer that I’m testing in tension: The two materials are made of an identical substance, and the force applied to both is identical. In the undeformed state, the second cylinder has a cross-sectional area equal to half that of the first cylinder. Assume incompressible material with linear elasticity; no plastic deformation occurs.
A. How does the engineering (i. e. nominal) stress differ in the two samples?
B. How does the engineering (i. e. nominal) strain differ in the two samples?
C. How does the expected change in length differ in the two samples?
D. How does the true stress differ in the two samples?
E. How does the true strain differ in the two samples?

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.