The stronger you strike the strings the greater the amplitude of the vibrations of the strings and the greater the sound.
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It won't change. Density is volume divided by mass, so if volume doesn't change, density doesn't change unless you change the mass of the object.
Ofcourse, the volume will increase Ofcourse, the volume will increase
If the total volume increases, then the pressure decreases.
The state of matter that shows the largest change in volume when warmed or cooled is gas. Liquids and solids increase and decrease in volume in response to temperature change as well, but not to the same magnitude as gases.
Yes. Usually when a substance freezes, or becomes a solid, it will decrease in volume, causing an increase in density. Water is an exception, which is less dense when it freezes/becomes solid.