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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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3 years ago
a child riding a bicycle at 15 meters per second accelerates at -3,0 meters per second? for 4.0 seconds. What is the child's spe
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Answer:

<h2> 27m/s</h2>

Explanation:

Given data

initital velocity u=15m/s

deceleration a=3m/s^2

time t= 4 seconds

final velocity v= ?

Applying the expression

v=u+at------1

substituting our data into the expression we have

v=15+3*4

v=15+12

v=27m/s

The velocity after 4 seconds is 27m/s

5 0
2 years ago
A boy throws a baseball onto a roof and it rolls back down and off the roof with a speed of 4.05 m/s. If the roof is pitched at
AlekseyPX

(a) The time the baseball spends in the air is 0.92 s.

(b) The horizontal distance from the roof edge to the point where the baseball lands on the ground is 3.1 m.

<h3>Time spent in air by the baseball</h3>

h = vt - ¹/₂gt²

-2.1 = (4.05 x sin 34)t  - ¹/₂(9.8)(t²)

-2.1 = 2.26t - 4.9t²

4.9t² - 2.26t - 2.1 = 0

t = 0.92 s

<h3>Horizontal distance traveled by the baseball</h3>

R = Vx(t)

R = (4.05 x cos 34)(0.92)

R = 3.1 m

Thus, the time the baseball spends in the air is 0.92 s.

The horizontal distance from the roof edge to the point where the baseball lands on the ground is 3.1 m.

Learn more about horizontal distance here: brainly.com/question/24784992

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8 0
2 years ago
Which describes the formation of Horizon B?
Finger [1]

c-undergoes the most change

Explanation:

Horizon B is the layer in a soil profile that has undergone the most change.

A section through a typical soil reveals many of the different layers.

The rock layers are divided into sections which are called horizons.

 Horizon O is the organic matter

  Horizon A is the top soil

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The subsoil of horizon B is the layer that undergoes the most change. It materials are constantly being leached away from this layer by chemical weathering. Some of the processes here accounts for it typical reddish brown color.

The rock layer here is rich in iron oxide and washed down minerals. It lacks significant amount of humus.

learn more:

Soil formation brainly.com/question/2473178

#learnwithBrainly

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3 years ago
What happens in an electromagnet if the core is partially air and partially iron when it is energized?
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IT WOULD act like an electromagnet even now
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