# Physics: A cube suspended in water by a cord; find mass and force

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A cube of aluminum, whose volume is Va= .125 m^3, and whose density is Da= 2700 kg/m^3 is suspended from a cord which holds it stationary with the top surface horizontal and h= 2.2 m below the surface of fresh water.

See attachment #1 showing known parameters.

PART a. Find the mass of the aluminum.

PART b. Find C, the force in the supporting cord.

https://brainmass.com/physics/classical-mechanics/cube-suspended-water-cord-mass-force-6109

#### Solution Preview

See attachment #2 showing forces.

PART a. The density of a material is mass per volume, so:

(1) Da= Ma/Va

Substitution of knowns will give you:

(2) Ma= 337.5 kg

PART b.

Whenever an object is at rest and ...

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