how do you calculate weight with density and volume known?

Question

example Density of steel .2836205 lb/in2
Volume is.044cubic in.
What is weight in lbs

is it density *Volume?

Answer 1

Unit of density is lb/in3 not lb/in2. lb/in2 is unit of pressure.
We usually consider lb as weight.
So, weight = Density x Volume
= 0.2836205 lb/in3 x 0.44 in3
= 0.12479302 lb

Answer 2

Hmm, I can't get that to come out right either. Here's how I think it should work: The difference in weight when measured in air and water equals the buoyancy force of the water, which is the weight of the displaced water. The scale is tared to read 0 when it has the weight of water over it. (ignore the weight of air, which is negligible). Convert that weight into volume. weight of displaced water = 0.020 N mass of displaced water = 0.00204 kg volume of displaced water = 0.00000204 m^3 volume of crown = 0.00000204 m^3 Now set up a system of equations giving the volume and weight of the crown. Let x = volume of copper, in m^3 Let y = volume of gold, in m^3 x + y = 0.00000204 Total weight of the crown = g*(total mass of the crown) 9.81 (8920 x + 19300 y) = .358 Once you've found the volume of gold, you can easily calculate its weight.

Answer 3

mass=volume*density
=.044cuin*.2836205 lb/in^3
=.0125 lbs
weight=.0125lbwt
alternatively
weight=mass*acceleration due to gravity
=.0125lbs*32ft/sec^2
=.4ftlb/sec^2

Answer 4

D= m/v

m=d*v

m= 0.2836205 lb/in2 x .044cubic in.