Linear mass density, u, can be calculated by isolating the u variable in the following equation: v = √(F/u), where v is the velocity, F is the force of tension, and u is linear mass density. Therefore, the equation would be: u = F/v2. You may need to first solve for velocity, using the equation v = fλ, where f is frequency and is λ wavelength. You may also need to solve for force of tension before solving for u. You can use the equation F = mass x gravity, where mass is in kilograms and gravity is 9.8 m/s2. After calculating these variables, you can calculate linear mass density by plugging them into this equation: u = F/v2.
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density = mass/volumemass = density*volumevolume= mass/density
You have to know two out of three ... mass, volume, density ... then you can find the missing one. If density is missing . . . Density = (mass)/(volume) If mass is missing . . . Mass = (density) x (volume) If volume is missing . . . Volume = (mass)/(density)
mass = volume x density
The density of an object is the ratio of its mass to its volume. Equivalently, it is its mass per unit volumes. In mathematical terms, Density = Mass/Volume
Mass (M) x Volume (V) is not the formula for anything. Mass multiplied by Volume is the formula for density. Mass multiplied by velocity (speed with a direction) is the formula for momentum.