Given: σ = ⎡ ⎣ 10 12 13 12 11 15 13 15 20 ⎤ ⎦ MPa at a point. What is the force per unit area at this point acting normal to the surface with unit normal vector n = (1/ √ 2)ex + (1/ √ 2)ez? Are there any shear stresses acting on this surface?

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.