the density of an unknown substance is 312 kilograms per cubic meter. (a) what is the mass of 2.43 cubic meter of the substance? (b) how much does this substance weigh?
2007-01-18 13:26:00 · 2 answers · asked by argentina_mandy20 1 in Science & Mathematics ➔ Physics
Density = mass / volume
You are given the density of volume of the mystery substance, so you just need to re-arrange the density equation to solve for the object’s mass.
Mass = density * volume
You know,
density = 312 kg.m^3
volume = 2.43 m^3,
so just plug in,
mass = (312 kg/m^3) * (2.43 m^2)
mass = 758.16 kg
mass = 758 kilograms
----------------
Weight = mass * gravity
Where “gravity” is the gravitational acceleration experiences by the object (9.81 m/s^2).
You just solved for the mass and gravity is a constant you are assumed to know.
Weight = (758 kg) * (9.81 m/s^2)
Weight = 7435.98 N
Weight = 7440 Newtons
(Mass and Weight are NOT!!!!! the same thing.)
2007-01-18 13:35:26 · answer #1 · answered by mrjeffy321 7 · 0⤊ 0⤋
312kg/M^3*2.43m^3 = 758kg
The mass and the weight are the same.
2007-01-18 21:36:32 · answer #2 · answered by Bayou Brigadier 3 · 0⤊ 1⤋