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Elis [28]
4 years ago
14

A bare 4 AWG copper conductor Installed horizontally near the bottom or vertically, and within that portion of a concrete foun d

ation or footing that is In direct contact with the earth, can be used as a grounding electrode when the conductor is at least __________ft in length.
Physics
1 answer:
neonofarm [45]4 years ago
4 0

Answer:

20 ft

Explanation:

This is the length where the direct contact could be used as ground electrode

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Block A, with a mass of 4 kg, is moving with a speed of 2 m/s while Block B, with a mass of 8.4 kg, is moving in the opposite di
dybincka [34]

Answer:

The center of mass move with the velocity of -3.487 m/s.

Explanation:

Given values of block A.

Mass of block A, (M1) = 4 kg

Speed of block A, (V1) = 2 m/s

Given values of block B.

 Mass of block B, (M2) = 8.4 kg

Speed of block B, (V2) = -6.1 m/s

Below is the formula to find the velocity of center of mass.

Velocity = \frac{M1V1 + M2V2}{M1 + M2} \\

= \frac{4 \times 2 + 8.4 \times (-6.1) }{4 + 8.4} \\

= \frac{- 43.24}{12.4}\\

= - 3.487 m/s

7 0
3 years ago
How many times can a three-dimensional object that has a radius of 1,000 units fit something with a radius of 10 units inside of
Mekhanik [1.2K]

Answer:

# _units = 1000

Explanation:

This exercise we can use a direct proportion rule.

If a volume of radius r = 1 is one unit, how many units can fit in a volume of radius 10?

    # _units = V₁₀ / V₁

The volume of a body of radius 1 is

       V₁ = 4/3 π r₁³

        V₁ = 4/3π

the volume of a body of radius r = 10

        V₁₀ = 4/3 π r₂³

        V10 = 4/3 π 10³

     

the number of times this content is

         #_units = 4/3 π 1000 / (4/3 π 1)

        # _units = 1000

8 0
3 years ago
What is the internal energy of 3.00 mol of N2 gas at 25 degrees C? To solve this problem, use the equation: U electronic gas = 5
allochka39001 [22]

<u>Given data</u>

Determine Internal energy of gas N₂,  (U) = ?

Temperature (T) = 25° C

                          = 25+273 = 298 K,

Gas constant (R) = 8.31 J/ mol-K ,

Number of moles (n) = 3 moles,

<u>Internal energy of N₂ </u>

Internal energy is a property of thermodynamics, the concept of internal energy can be understand by ideal gas. For example N₂, the observations for oxygen and nitrogen at atmospheric temperatures,  f=5,  (where f is translational  degrees of freedom).

       So per kilogram of gas,

          The internal energy (U) = 5/2 .n.R.T

                                                  = (5/2) × 3 × 8.31 ×298

                                                  = 18572.85 J

<em>The internal energy of the N₂ is 18,572.85 J and it is approximately equal to 18,600 J given in the option B.</em>

 



8 0
3 years ago
Read 2 more answers
Select all that apply. What factors can limit growth?
Rudiy27
A, b and d

Competition for fix resources of course increases the energy expenditure needed to gather those resources and leaves less for a given population. A lower amount of sunlight or water also contributes to decreased energy which lowers growth. Finally, small borders limit growth in that population density can only go so high before the death rate increases beyond the birth rate.
8 0
3 years ago
Read 2 more answers
A net force of 10.N accelerates an object at 5.0 m/s^2. What net force would be required to accelerate the same object at 1.0 m/
Leokris [45]

Answer:

I believe the answer is 2.0

Explanation:

4 0
3 years ago
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