sigh* if you are nice you wont go to my question i posted before i posted this one, pls dont go if you do i will die so pl dont go to that question, just saying because everytime i post a question everyone goes to my other ones, and theres one i dont want peple going to so pl dont go to that question

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?