A 100 N force is applied to a pulley to lift a 500 N object. What is the actual mechanical advantage of the pulley? Please help, I'm tired of trolls.

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

Where do magnetic lines of force enter earth?

How is an electron dot structure used to represent a covalent bond?