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LuckyWell [14K]
2 years ago
7

What is the density of an object with a mass of 50 grams and a volume of 4 cm3

Physics
2 answers:
nadya68 [22]2 years ago
5 0

Answer:

12.5 gram/cubic centimeter

Explanation:

D= mass/volume

You divide 50 (mass) by 4 (volume)

This equals 12.5 grams per cubic centimeter

BlackZzzverrR [31]2 years ago
4 0
It should be 1.28 , sorry if I got it wrong
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Answer:

The conductivity of Nichrome is 2\times 10^6\ S/m.

Explanation:

Given:

Potential difference (V) = 2.0 V

Current flowing (I) = 4.0 A

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Area of cross section of wire (A) = 1.0 mm² = 1 × 10⁻⁶ m² [1 mm² = 10⁻⁶ m²]

We know, from Ohm's law, that the ratio of voltage and current is always a constant and equal to the resistance of the resistor. Therefore, the resistance of the nichrome wire is given as:

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R=\rho\frac{L}{A}

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0.5\ \Omega=\rho\frac{1.0\ m}{1\times 10^{-6}\ m^2}\\\\\rho=\frac{0.5\times 1\times 10^{-6}}{1.0}=0.5\times 10^{-6}\ \Omega-m

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\sigma=\frac{1}{\rho}=\frac{1}{0.5\times 10^{-6}}=2\times 10^6\ S/m

Conductivity is measured in Siemens per meter (S/m)

Therefore, the conductivity of Nichrome is 2\times 10^6\ S/m.

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