# Homework Help: Buoyant Force Math Problems

1. Jan 31, 2008

### WhiteTiger09

A piece of metal weighs 50 N. in air, 36.0 N in water, and 41.0 in an unknown liquid. Find the densities of the following:
The metal
The unknown liquid

2. Feb 1, 2008

### Kurdt

Staff Emeritus
What have you tried so far?

3. Feb 10, 2008

### miragab

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d=m/v. • Density of a substance is affected by temperature and pressure. These vary according to the physical properties of the substance. The effect of temperature on the density of solids and gases varies widely. Gases are most affected; solids are least and liquids ranging generally in between.

4. Feb 10, 2008

### Kurdt

Staff Emeritus
I don't think temperature is relevant in that problem

5. Feb 10, 2008

### miragab

If the temperature of the liquid changes, the S.G. may also change. Because temperature change will cause the liquid to expand or contract, depending on whether the temperature goes below or above the standard temperature.
The S.G. or Mass Density of most liquid is calculated at a Standard Temperature (60°F).

(The Effect of Temperature is that, as the temperature of the liquid increases, the liquid expands and gets lighter per volume. Consequently, the force per unit area will decrease. On the other hand, as the temperature of the liquid decreases, the liquid contracts and becomes heavier per volume and causes the force per unit area to increase.)---