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emmainna [20.7K]
3 years ago
5

Which of the following material offers the lowest resistivity?

Physics
2 answers:
Yuki888 [10]3 years ago
7 0
Lower resistivity means higher conductivity: among these materials, the best conductor is silver, therefore it must be the material with lowest resistivity among those. We can also have a look at the value of resistivity of the different materials listed in the problem, to check our answer. The resistivities of the materials are the following:
Wood: 1.00\cdot 10^{3} \Omega \cdot m
Salt water: 2.00\cdot 10^{-1} \Omega \cdot m
Silver: 1.59\cdot 10^{-8} \Omega \cdot m
Lead: 2.20\cdot 10^{-7} \Omega \cdot m
<span>We see that the material with lowest resistivity among those is silver, therefore the correct answer is silver.</span>
Gekata [30.6K]3 years ago
4 0

Answer:

Lowest resistivity : silver

Explanation:

The reciprocal of conductivity is called the resistivity of a material. Mathematically it can be written as :

\sigma=\dfrac{1}{\rho}=R\dfrac{A}{l}

Where

\sigma is the conductivity

\rho is the resistivity of the material

l and A are the length and the area of the material.

So, the material having highest conductivity will have lowest resistivity. Silver is the good conductor of electricity i.e. highest conductivity.

So, silver offers lowest resistivity.

Hence, the correct option is (c) " silver ".

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Answer:

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Explanation:

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F = 0.67Kg*12m/s^{2} = 8.04N, assuming it took her one second to accelerate camera to 12m/s, then by newtons third law, which says every action has equal and opposite reaction , the camera exerts the same amount of force on the astronaut which gives her acceleration of a = \frac{8.04N}{70.2Kg} = 0.1130801680m/s^2.

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Hope this helps!! :)

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