What is the ideal mechanical advantage of the pulley system shown in this figure? Why? I will give 20 points please i need help

Diamond will scratch quartz. true or false

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.