Kinetic energy = 1/2mv²
where m = 54kg
and v =3m/s
k.e = 1/2×54×3×3
= 1/2×54×9
= 1/2×426
= 486÷2
= 243J
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Answer:
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Explanation:
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Answer:
9.368g/mL
Explanation:
The density is defined as the mass of a compound in a determined volume.
Based on Archimedes' law, the volume of the piece of metal is the difference between the volume of the water + the inmersed piece - the original volume of water. That is:
<em>Volume of the metal:</em>
257.5mL - 229.0mL = 28.5mL
As the mass of the metal is 267.0g; its density is:
<em>Density:</em>
267.0g / 28.5mL =
<h3>9.368g/mL</h3>
It has 49 electrons as well. The amount of protons and electrons are equal.