A metal underground water pipe that is in direct contact with the Earth for ? or more is a code-recognized as a grounding electrode and must be included in the grounding electrode system.

Answers

Answer 1

Answer:

Answer:

10 feet

Explanation:

In a standard procedure, there should be an approximate value of 10 feet between the water pipe and the Earth. This is to prevent the contamination of water and also the corrosion of the water pipe. Most pipes are made of iron and in the presence of water, there can be a chemical reaction between the iron and water in the presence of oxygen.

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A race car starting from rest accelerates uniformly at 4.9 m/s^2. What is the car's speed after it has traveled 200 meters?

Answers

The equation v²=u²+2as will help with solving this equation
v is what we are trying to find
u=0
a=4.9
s=200
v²=0²+2*4.9*200
v=√(2*4.9*200)
v=√1960
v=44.3 m/s (3 sf)

Hello!

A race car starting from rest accelerates uniformly at a rate of 3.90 m/s² what is the cars speed after it has traveled 200 m.

We have the following data:

Vf (final velocity) = ? (in m/s)

Vi (initial velocity) = 0 m/s (accelerated from rest)

d (displacement) = 200 m

a (acceleration) = 4.90 m/s²

Since we do not need to know the time elapsed during the movement, we apply the data of the question to the Equation of Torricelli, let us see:

$V_f^2 = V_i^2 + 2*a*d$

$V_f^2 = 0^2 + 2*4.90*200$

$V_f^2 = 0 + 1960$

$V_f^2 = 1960$

$V_f = √(1960)$

$V_f = 44.27188724...$

$\boxed{\boxed{V_f \approx 44.27\:m/s}}\:\:\:\:\:\:\bf\blue{\checkmark}\bf\green{\checkmark}\bf\red{\checkmark}$

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For a conclusion to be accepted by the scientific community, the data must be accurate, free from error, andA.reproducible.

B.varied.

C.unique.

D.surprising

Answers

The data must be reproducible: it means that the data will be reliable and representative and not that this data would lead to one conclusion and another data would lead to another.

Data being varied, unique or surprising does not have anything to do with acceptability of the conclusion.

Answer:

reproducible

Explanation: edg

Which explanation of the solar system best fits the observations of the planets and how they orbit the sun? (Points : 3)       The gravity of a large, massive star passing the sun ripped off blobs of material from it that formed the planets.The planets formed at the center of a collapsing spinning cloud of gas and dust.
       The sun and planets formed from a collapsing spinning cloud of gas and dust.
       A comet hit the sun and sent off fragments that became the planets.

Answers

From those choices, the best is the third one. it relates to why the sun and almost everything else in the solar system spins in the same direction, and also why the abundance of various elements in the planets is so different from what it is in the sun.

A boy kicks a ball with a mass of 5 kg so that it accelerates at 4 m/s2 in the forward direction. A 40 N
B 0 N
C 20 N backward
D 20 N forward

Answers

I think it should be D

Find the speed of sound in air that is 30.0°C.

350

314

18

Answers

Answer:

v = 350 m/s

Explanation:

The speed of sound depends on the temperature of surrounding. The relation between the speed of sound and the temperature is given by :

$v=331+0.61T$

Where, T is temperature in Celsius

Here, T = 30 degree Celsius

$v=331+0.61* 30$

v = 349.3 m/s

v = 350 m/s

Therefore, the speed of sound in air at 30 degrees Celsius is 350 m/s.

Answer:

the answer is 350 m/s

Explanation:

Sign of the charge???A glass marble is rubbed against a piece of silk. As a result the piece of fabric acquires extra electrons. What happens to the glass marble? (a)The marble has lost the same number of electrons acquired by the piece of silk. (b)The marble has acquired the same number of electrons acquired by the piece of silk. (c)The marble acquires a positive charge and repels the piece of silk. (d)The marble acquires a positive charge and attracts the piece of silk. (e)The marble acquires a negative charge and attracts the piece of silk. (f)The marble acquires a negative charge and repels the piece of silk. There may be more than one answer.

Answers

The right answer for the question that is being asked and shown above is that: "(b)The marble has acquired the same number of electrons acquired by the piece of silk; (f)The marble acquires a negative charge and repels the piece of silk."

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