Astructural steel column is 20 meters long and has a square cross-section with a side length of 10 cm. a force of 6 × 105 newtons compresses the column. (this force is equivalent to the weight of several trucks.) estimate by how much the column’s length decreases, and compare the change in length with the original length of the column. first, divide the force by the cross-sectional area to calculate the stress σ. when you calculate the area, remember to convert to meter2. then use the equation to calculate the change in length, δl. show the steps in your work.

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

a person with a mass of 106kg has a weight of 1060n

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west