Small heavy object. Because density means how compact the object is. If the object is heavier, it will have greater density because it is more compact.
Pressure is defined as the force divided by the area perpendicular to the force over which the force is applied, or. A given force can have a significantly different effect depending on the area over which the force is exerted.
The power plant would be Mitochondrion because it makes ATP for the cell. Hope this helps!