Physics: Alength of copper wire has a resistance 44 ω. the wire is cut into three pieces of equal length, which are then connected as parallel lengths between points a and b. what resistance will this new wire of length l0 3 have between points a and b? answer in units of ω.

Alength of copper wire has a resistance 44 ω. the

Ответ:

evanwall91

13.01.2022

Physics

$\frac{R}{1} = \frac{44}{9}\ohm$

Explanation:

Let us imagine that there are three wire of length equal length having equal resistances each of 44/3 Ω

Now connect these wires in parallel to so that their equivalent resistance is R.

then

$\frac{1}{R} = \frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}$

$\frac{1}{R} = \frac{3}{44}+\frac{3}{44}+\frac{3}{44}$

$\frac{1}{R} = \frac{9}{44}$

⇒ $\frac{R}{1} = \frac{44}{9}\ohm$

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Ответ:

Dragon63770

13.01.2022

Physics

4.89 Ω

Explanation:

we know that resistance is directly proportional to length. hence as the wire is cut in three pieces, the resistance of each piece becomes one-third of the original resistance of the wire.

= Resistance of wire = 44 Ω

= resistance of each piece

Resistance of each piece is given as

$r = \frac{R}{3}\\r = \frac{44}{3}$

The three pieces are connected in parallel,

$R_{p}$ = Resistance of parallel combination of three pieces

Resistance of parallel combination is given as

$\frac{1}{R_{p}}= \frac{1}{r} + \frac{1}{r} + \frac{1}{r} \\\frac{1}{R_{p}}= \frac{3}{r}\\R_{p}= \frac{r}{3}\\R_{p} = \frac{\frac{44}{3} }{3}\\R_{p} = \frac{44}{9} \\R_{p} = 4.89 ohm$

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Ответ:

jimena15

11.03.2022

Physics

Sunita will change the variable water.

Explanation:

Sunita have to change the variable water to perform this experiment of diffusion.This is because she is going to predict that more water she uses longer the time needed for the dye to spread through it.

As a result she is increasing the amount of water to observe the effect of diffusible substance on diffusion with time.

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Alength of copper wire has a resistance 44 ω. the wire is cut into three pieces of equal length, which are then connected as parallel lengths between points a and b. what resistance will this new "wire" of length l0 3 have between points a and b? answer in units of ω.

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