No point source comes from a variety of locations and is easy to trace

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?

Discuss the difference between thermal energy and heat. (terrance) terrance, egolf, r., congdon, donald. physical science student text, 5th edition. bju press, 2014. vitalbook file.