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oee [108]
3 years ago
14

In a two-source circuit, one source acting alone produces 10 ma through a given branch. the other source acting alone produces 8

ma in the opposite direction through the same branch. the actual current through the branch is

Physics
1 answer:
pashok25 [27]3 years ago
6 0
Refer to the figure below.
R = resistance.

Case 1:
The voltage source is V₁ and the current is 10 mA. Therefore
V₁ = (10 mA)R

Case 2:
The voltage source is V₂ and the current is 8 mA. Therefore
V₂ = (8 mA)R

Case 3:
The voltage across the resistance is V₁ - V₂. Therefore the current I is given by
V₁ - V₂ = IR
10R - 8R = (I mA)R
2 = I
The current is 2 mA.

Answer: 2 mA

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What is the relationship between lightning and atoms
Rufina [12.5K]

Answer:

The answer is A

Explanation:

Lightning is formed by electrons in the air

6 0
3 years ago
During a test, a NATO surveillance radar system, operating at 37 GHz at 182 kW of power, attempts to detect an incoming stealth
Marta_Voda [28]

(a) 2.68\cdot 10^{-6} W/m^2

The intensity of an electromagnetic wave is given by

I=\frac{P}{A}

where

P is the power

A is the area of the surface considered

For the waves in the problem,

P=182 kW = 1.82\cdot 10^5 W is the power

The area is a hemisphere of radius

r=104 km=1.04\cdot 10^5 m

so

A=2\pi r^2=2\pi (1.04\cdot 10^5 m)^2=6.8\cdot 10^{10} m^2

So, the intensity is

I=\frac{1.82\cdot 10^5 W}{6.8\cdot 10^{10}m^2}=2.68\cdot 10^{-6} W/m^2

(b) 5.9\cdot 10^{-7} W

In this case, the area of the reflection is

A=0.22 m^2

So, if we use the intensity of the wave that we found previously, we can calculate the power of the aircraft's reflection using the same formula:

P=IA=(2.68\cdot 10^{-6} W/m^2)(0.22 m^2)=5.9\cdot 10^{-7} W

(c) 8.7\cdot 10^{-18} W/m^2

We said that the power of the waves reflected by the aircraft is

P=5.9\cdot 10^{-7} W

If we assume that the reflected waves also propagate over a hemisphere of radius

r=104 km=1.04\cdot 10^5 m

which has an area of

A=2\pi r^2=2\pi (1.04\cdot 10^5 m)^2=6.8\cdot 10^{10} m^2

Then the intensity of the reflected waves at the radar site will be

I=\frac{P}{A}=\frac{5.9\cdot 10^{-7} W}{6.8\cdot 10^{10} m^2}=8.7\cdot 10^{-18} W/m^2

(d) 8.1\cdot 10^{-8} V/m

The intensity of a wave is related to the maximum value of the electric field by

I=\frac{1}{2}c\epsilon_0 E_0^2

where

c is the speed of light

\epsilon_0 is the vacuum permittivity

E_0 is the maximum value of the electric field vector

Solving the equation for E_0,

E_0=\sqrt{\frac{2I}{c\epsilon_0}}=\sqrt{\frac{2(8.7\cdot 10^{-18} W/m^2)}{(3\cdot 10^8 m/s)(8.85\cdot 10^{-12} F/m)}}=8.1\cdot 10^{-8} V/m

(e) 1.9\cdot 10^{-16} T

The maximum value of the magnetic field vector is given by

B_0 = \frac{E_0}{c}

Substituting the values,

B_0 = \frac{(8.1\cdot 10^{-8} V/m)}{3\cdot 10^8 m/s}=2.7\cdot 10^{-16} T

And the rms value of the magnetic field is given by

B_{rms} = \frac{B_0}{\sqrt{2}}=\frac{2.7\cdot 10^{-16} T}{\sqrt{2}}=1.9\cdot 10^{-16} T

7 0
3 years ago
The emerging field of architectural climatology centers on the potential of as-yet-undeveloped architecture and landscaping to a
Wittaler [7]

Answer: the correct one is E .systems; for example, hurricanes could be prevented from forming by artificial "reefs" of precisely shaped marine platforms

Explanation:

(A) The portion after the semi-colon (for instance, ... platforms) is not a complete sentence.

(B) The portion after the semi-colon (for example, ... forming) is not a complete sentence.

(C) Which ... "reefs" ... prevent forming is unidiomatic; from is needed between prevent and forming. Prevent appears in the present tense, illogically implying that the artificial reefs—which don't yet exist, according to the earlier part of the sentence—already prevent the formation of hurricanes.

(D) The construction such as artificial "reefs" illogically implies that artificial reefs are weather systems. Additionally, the use of can in the present tense (as opposed to could) illogically implies that the artificial reefs—which don't yet exist, according to the earlier part of the sentence—do already exist.

(E) CORRECT. The semicolon is properly used to separate two complete sentences. Could is correctly used to describe a hypothetical consequence.

6 0
3 years ago
The electric force between two charged vinyl balloons is 3.0 × 10-3 newtons. If the distance between them is 6.0 × 10-2 meters a
irakobra [83]
The electric force between two objects can be understood by looking at Coulomb's Law. The law states that the electric force is directly proportional to the charges of the 2 objects, and inversely proportional as the square of the distance. This is shown below:

F = (k * Q1 * Q2) / d^2

Where: k = proportionality constant; Q1 = charge of object 1; Q2 = charge of object 2; d = distance between objects.

Given:

F = <span>3.0 × 10^-3 N
Q1 = </span>3.3 × 10^-8 coulombs<span>
Q2 = ?
d = </span><span>6.0 × 10^-2 m
</span><span>k = 9.0 × 10^9

Substituting:

3 x 10^-3 = (9 x 10^9 * 3.3 x 10^-8 * Q2) / (6 x 10^-2)^2
[(</span>3 x 10^-3) * (6 x 10^-2)^2] / [(<span>9 x 10^9) * (3.3 x 10^-8)</span>] = Q2
Q2 = 3.636 x 10^-8 coulombs
8 0
3 years ago
If the clothing maker bought 500 m2 of this fabric, how much money did he lose? Use 1tepiz=0.625dollar and 0.9144m=1yard.'
xenn [34]


1 yard^2 = 0.8361m^2.? 
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.


<span>So he spent (.625 x 400) = $250.00 per m^2. </span>
<span>He paid out (500 x 250) = $125,000 on the deal. </span>
<span>He received (500 / 0.8361) = 598.014592 yard^2 of fabric. </span>
<span>That would have cost (598.014592 x 120) = $71,761.75 locally. </span>
<span>He lost (125,000 - 71,761.75) = $53,238.25 on the deal. </span>

You can rework with the incorrect conversion factor.
3 0
3 years ago
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