To chnage the volume of a drum, you must increase or decrease th energy you use to hit the drum. Hope this helped
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"Drum" is not a mass unit I'm familiar with. If you mean a drum of something, what's the volume and what's it filled with?
Pi, times, the squaire of the raidous, times hight. = volume
More data is required. I assume the drum has the form of a cylinder; the volume of a cylinder is calculated as pi x radius squared times height. Different combinations of radios and height can give the same volume.
Assuming that the drum itself has no mass and weight, calculate the mass of the liquid in which you want to place the drum. Use the formula: mass = density x volume The amount of mass to sink the drum will have to be that amount, or more.
Volume = pi*1.52*3 = 21.206 cubic feet correct to 3 dp