What happens to the density of a given substance if you increase the amount of the substance that you have?

Ahollow metal sphere has 6 cm and 11 cm inner and outer radii, respectively. the surface charge density on the inside surface is −100nc/m2. the surface charge density on the exterior surface is:

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

What is the quantity which is measured by the area occupied below the velocity- time graph?