You put this rod under scanning electron microscope and you found a crack on the surface. You would like to determine the maximum allowable surface crack length by assuming that the applied tensile strength was a critical stress. Determine the maximum allowable surface crack length if the surface energy is 0.5 J/m2

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

What are chlorofluorocarbons and what impact do they have on the atmosphere?

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error