# A bar of gold is 10 cm long, and its cross-section is a square with a side of 1 cm.

June 28, 2021 | education

| **A bar of gold is 10 cm long, and its cross-section is a square with a side of 1 cm. A wire was made from this bar. What is the length of this wire if its cross-section is a square with a side of 0, 005 mm?**

the solution of the problem:

1. Determine the volume of a bar of gold.

100 * 10 * 10 = 10000 mm3.

2. Determine the cross-sectional area of the wire.

0.005 * 0.005 = 0.000025 mm2.

3. Determine the length of the wire.

10000: 0.000025 = 400000000 mm = 400 km.

Answer: the length of the wire is 400 km.

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