Pressure is force over area. So assuming your cube is at rest and on earth, then the force is mass x gravity and the pressure is mass x gravity / area.
A string quartet is made up of four musicians playing two violins, a viola, and a cello. These are all string instruments played either by plucking the strings or using a bow. The violins are the smallest and typically play the higher notes. The viola and cello are larger instruments and play the lower notes.
The string family consists of four instruments, the Violin, the Viola, the Cello, and the Bass. Sound is made by each instrument in the family by plucking with the fingers or rubbing the horse hair bow across a string. Each instrument also comes in a variety of sizes, to fit the size of the student.