A composite block contains of pine wood with density and of iron with density

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Fluids · Fluids

Problem

A composite block contains

0.008\,\text{m}^3

of pine wood with density

500\,\text{kg m}^{-3}

and

0.002\,\text{m}^3

of iron with density

7.8\times10^{3}\,\text{kg m}^{-3}

. What is the block’s average density? (a)

9.80\times10^{2}\,\text{kg m}^{-3}

(b)

4.15\times10^{3}\,\text{kg m}^{-3}

(c)

1.96\times10^{3}\,\text{kg m}^{-3}

(d)

6.50\times10^{2}\,\text{kg m}^{-3}