Four forces are acting on the block in the diagram. One of the forces is unknown. If the block is in equilibrium, what is the correct unknown force?

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk,in meters?

Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

The least penetrating form of radiation is