Calculation formulas for pressure, buoyancy, work, power and mechanical efficiency, as well as variant forms, There are pressure, buoyancy, work, power, mechanical efficiency these calculation problems can not do, how to do?

Calculation formulas for pressure, buoyancy, work, power and mechanical efficiency, as well as variant forms, There are pressure, buoyancy, work, power, mechanical efficiency these calculation problems can not do, how to do?

Pressure formula: P = f / s scope of application: all solids and liquids in regular containers (refer to cylinders, rectangles, cubes, etc.) P = ρ GH scope of application: all liquids and regular solids (refer to cylinders, rectangles, cubes, etc.) buoyancy formula: Archimedes principle applies to the calculation of all buoyancy: F floating = g row = ρ liquid