John wants to move a 200-kg rock using a stiff bar measuring 3 meters long as a lever. he puts the fulcrum x meters from the rock. assume that g = 10m/s^2. 2-1. sketch this in a diagram and annotate the forces/velocities. (10pts) 2-2. if x = 0.5m, how much force must he use in order to move the rock? (10pts) 2-3. if the maximum force he can exert on the crowbar is 500n, what is

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.