3 years ago

Plz help me on science about cells

1 answer:

6 0

Cell theory states that all living things are made of cells. And cells can only come from other cells, this disproves spontaneous generation and therefore proves the view that organisms can grow from food or dirt is wrong.

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Explain why, if you go to the moon, your weight would change but your mass wouldnt

Evgen [1.6K]

There's little gravity so your weight would change but not your mass

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4 years ago

A rod of 2.0-m length and a square (2.0 mm x 2.0 mm) cross section is made of a material with a resistivity of 6.0 x 10^-8 0.Ω.m

Ksju [112]

Answer:

Heat generated in the rod is 8.33 watts.

Explanation:

It is given that,

Length of rod, l = 2 m

Area of cross section, $A=2\ mm\times 2\ mm=4\ mm^2=4\times 10^{-6}\ m^2$

Resistivity of rod, $\rho=6\times 10^{-8}\ \Omega-m$

Potential difference, V = 0.5 V

The value of resistance is given by :

$R=\rho\dfrac{l}{A}$

$R=6\times 10^{-8}\ \Omega-m\times \dfrac{2\ m}{4\times 10^{-6}\ m^2}$

R = 0.03 ohms

Let H is the rate at which heat is generated in the rod . It is given by :

$\dfrac{H}{t}=I^2R$

Since, $I=\dfrac{V}{R}$

$\dfrac{H}{t}=\dfrac{V^2}{R}$

$\dfrac{H}{t}=\dfrac{(0.5)^2}{0.03}$

$\dfrac{H}{t}=8.33\ watts$

So, the at which heat is generated in the rod is 8.33 watts. Hence, this is the required solution.

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valentina_108 [34]

I took physics last year. I’m not the best but I have some idea.

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Question 6

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Answer:

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Explanation:

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