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Rainbow [258]
2 years ago
14

HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Physics
1 answer:
stiks02 [169]2 years ago
8 0

Answer:

oop i cant see the anwer choices correctly

Explanation:

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Suppose an electrical wire is replaced with one having every linear dimension doubled (i.e. the length and radius have twice the
saul85 [17]

Answer:

The wire now has less (the half resistance) than before.

Explanation:

The resistance in a wire is calculated as:

R=\alpha \frac{l}{s}

Were:

R is resistance

\alpha is the resistance coefficient

l is the length of the material

s is the area of the transversal wire, in the case of wire will be circular area (s=\pi r^{2}).

So if the lenght and radius are doubled, the equation goes as follows:

R=\alpha \frac{l}{\pi r^{2} } =\alpha \frac{2l}{\pi {(2r)}^{2} } =\alpha \frac{2l}{\pi 4 {r}^{2} }=\frac{1}{2} \alpha \frac{l}{\pi r^{2} }

So finally because the circular area is a square function, the resulting equation is half of the one before.

7 0
3 years ago
A construction worker pushes a cement block with a 750 N force for 10 minutes without the cement block moving. How much work did
lutik1710 [3]
The work done by a system on a different body is equal to the product of the force exerted and the distance that the body has move in parallel to the force exerted. In this item, we have to determine first the distance and multiply it with the given force equal to 750N. 
8 0
3 years ago
Read 2 more answers
A sound is recorded at 19 decibels. What is the intensity of the sound?
aalyn [17]

Answer:

79·433 × 10^{-12} W/m²

Explanation:

Given intensity of sound in decibels is 19

Formula for intensity of sound in decibels is

<h3>I_{1} = 10 × ㏒(I ÷ I_{0})</h3>

where

I_{1} is the intensity of sound measured in decibels

I is the intensity of sound measured in W/m²

I_{0} is the intensity of the sound that is taken as standard and it's value is equal to 10^{-12} W/m²

By applying the formula

19 = 10 × ㏒(I ÷ I_{0})

⇒ 1·9 = ㏒(I ÷ I_{0})

⇒ antilog(1·9) = I ÷ I_{0}

⇒ 79·433 = I ÷ 10^{-12}

⇒ I = 79·433 × 10^{-12} W/m²

∴ Intensity of sound = 79·433 × 10^{-12} W/m²

4 0
3 years ago
How can your life be negatively impacted by not being scientifically literate in today's world?
aksik [14]

Answer:

may be or sometimes not

Explanation:

It depends on those who Surround you and your confidence

6 0
2 years ago
A simple cyanine dye molecule has a long central carbon chain, with a total of 8 bonds, between the two nitrogen atoms. One elec
wariber [46]

Answer:

For one dimensional box

E= n^{2}h^{2}/ 8mL^{2}

For lowest energy transition will be from n =1 to n=2

Hence,

hc/\lambda = 2^{2}h^{2}/ 8mL^{2} - h^{2}/8mL^{2}

h= 6.626 *10-34 J.s

m = 9.31 *10-31 Kg

L= 0.14 * 10-9 m

c= 3 *108 m/s

\lambda = 8*c*m*L^{2} / 3*h

\lambda = 22 nm

Not in visible range

4 0
3 years ago
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