I have 2 past exam questions which i am having difficulty with:1. Consider a 1mm steel diameter wire which supports a 3 kg load. The tensile stress on the wire is closest in value to?I‘m not sure how to calculate tensile strength with the given information. I know how to do so when given a graph of stress vs strain, but what am I supposed to do in this sort of question? The answer is 37.5 MPa2. A rectangular copper bar is originally 19.05mm x 6.35mm and 304.8mm long. It is loaded in tension so that it elongates 0.015mm/mm while under load. The length of the bar while it is loaded is closest in value to?I have no idea how to solve this question at all. The answer 309.4 mm. Any help with either of these problems would be greatly appreciated!
A busbar is a piece of metal used to conduct electrical power to several places. It is commonly used in input power distribution in general electrical power for homes and industry. I think the name came from the similarity to a bus that picks up people and moves them in a common carrier to various locations and drops them off.
For first Question: Convert load from kg to Newton and then calculate the stress by regular formula i.e. Stress(Load/Area). To convert load from kg to Newton multiply the load in kg by 9.81 Second question is lengthy to put here. Look in Strength of Material reference book.
Tensile Strength And Elongation
1mm dia wire has a cross section of pi* r^2 pi* 0.5^2 pi/4 (1/cm^2) .7854cm^-2 tensile stress 3/.7854 kg/cm^2 3.82 kg/cm^2374kPa if the bar elongates .015mm per mm of length then 304.8 becomes 304.8*1.015 309.4mm
busbar is a metal layer whose voltage level and frequency does not change with the variation in load This is mainly employed in electricity board department
