Asolid round bar with diameter of 2-in has a groove cut to a diameter of 1.8-in, with a groove radius of 0.1-in. the bar is not rotating. the bar is loaded with a repeated bending load that causes the bending moment at the groove to fluctuate between 0 and 25000 lbf-in. the bar is hot-rolled aisi 1095, but the groove has been machined. determine the factor of safety for fatigue based on infinite life (use the asme elliptical criteria) and the factor of safety for yielding.

I believe the factory of fatigue based on infinite life will not reach infinite life. Maybe if the round bar has a 3-in diameter with a groove cut of 2.1-in in diameter it can reach infinite life. It should be expanded to a grove radius of 1.3-in with a rotating bar. It should also be hot-rolled aisi 1080 and not machined. The factory should end at a satisfactory safety yielding.

Cpowerlifting my boi

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)