# Copper plate

Copper plate length 3.2 m and width 50 cm weighs 55.42 kg. What is the plate thick, if 1 m3 of copper weighs about 8700 kg?

Correct result:

d =  4 mm

#### Solution:

$d = \dfrac{ 55.42}{ 3.2 \cdot \dfrac{ 50}{100} \cdot 8700} \cdot 1000 = 4 \ \text{mm}$

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