Bubble Crash

Density Plastic

Density Plastic

i need help with some dimensional analysis and density problems?

1.) A rectangular piece of plastic has a width of 4.2cm, a height of 1.9cm, and a mass of 64.4g. If the density of the plastic is 0.92 g/cm^3, what is the length of the plastic?
2.)What is the mass, in pounds, of 1.00 cubic feet of lead? The density of lead is 11.3g/cm^3.

1. density = mass/volume
0.82g/cm^3=(64.4g)/
(4.2cm*1.9cm*x)

4.2*1.9*x=64.4/0.82=78.54

7.98x=78.54

x=9.84cm

2. g/cm^3*(1lb/454g)*
(30.48cm/foot)^3
=lb/foot^3
(11.3g/cm^3)*(1lb/454g)*
(30.48cm/foot)^3
=704.80lb/foot^3

Stupid line breaks.

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