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4 years ago

Describe what causes the flow of electric current.

2 answers:

5 0

An electrical current is caused by flow of free electrons from one atom to another.

VMariaS [17]4 years ago

3 0

My answer -

Electrical pressure, called "electro-motive force" (EMF), is what causes current to flow in an electrical circuit. EMF is measured in volts. Pressure and the quantity of electricity transmitted can be considered analogous to pressure and quantity of water flowing in pipes: the longer the distance, the higher is the flow of water (called the "flow of electrical charge, which is also known as the "electric current"). That is why, for long distance transmission, high pressure (voltage for electricity) is required, failing which, the current - and therefore the power - will not reach the intended destination. Instead, it will be lost (also called "dissipate") along the way. We can think of electrical
current as the quantity of electricity which will be drawn from the pipeline
 cables for electricity) at the pressure (= voltage) required. 

P.S

Happy to help you have an AWESOME!!! day ^-^

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2. At noon, ship A was 12 nautical miles due north of ship B. Ship A was sailing south at 12 knots (nautical miles per hour; a n

AleksandrR [38]

Answer:

Explanation:

Let the reference origin be location of ship B in the beginning. We can then create the equation of motion for ship A and ship B in term of time t (hour):

A = 12 - 12t

B = 9t

Since the 2 ship motions are perpendicular with each other, we can calculate the distance between 2 ships in term of t

$d = \sqrt{A^2 + B^2} = \sqrt{(12 - 12t)^2 + (9t)^2}$

For the ships to sight each other, distance must be 5 or smaller

$d \leq 5$

$\sqrt{(12 - 12t)^2 + (9t)^2} \leq 5$

$(12 - 12t)^2 + (9t)^2 \leq 25$

$144t^2 - 288t + 144 + 81t^2 - 25 \leq 0$

$225t^2 - 288t + 119 \leq 0$

$(15t)^2 - (2*15*9.6)t + 9.6^2 + 26.84 \leq 0$

$(15t^2 - 9.6)^2 + 26.84 \leq 0$

Since $(15t^2 - 9.6)^2 \geq 0$ then

$(15t^2 - 9.6)^2 + 26.84 > 0$

So our equation has no solution, the answer is no, the 2 ships never sight each other.

8 0

3 years ago

How does a sound wave's amplitude affect the sound we hear? How does a sound

damaskus [11]

Answer:

cause we hear differently

Explanation:

7 0

3 years ago

Read 2 more answers

Please help anyone i will mark brainliest

Andrei [34K]

Fg = G m₁ m₂ / r²

Fg = (6.67×10−¹¹) ( 70) ( 5.972×10²⁴) / (6.3781×10⁶)²

Fg = 685.43 N

4 0

3 years ago

When you rub your hands together, you cannot push harder on one hand than the other. can push harder on one hand than the other.

Sholpan [36]

I think it means that your putting in an equal amount of force on each hand because it's the same brain that controls what you do. I think that's what it means, not entirely sure but hope this helps

3 0

3 years ago

Calculate the escape speed for a spacecraft from the surface of (a) mars; and from the surface of (b) jupiter. ( the escape spee

Len [333]

The escape speed for a spacecraft at the surface of a planet of mass M and radius R is:
$v= \sqrt{ \frac{2GM}{R} }$
where G is the gravitational constant. We can use this formula to solve both parts of the problem, using the data of Jupiter and Mars.

a) Mars:
Mars mass is $M=6.4 \cdot 10^{24}kg$ , while Mars radius is $R=3.4 \cdot 10^6 m$ , so the escape speed of the spacecraft at Mars surface is
$v= \sqrt{ \frac{2 (6.67 \cdot 10^{-11} m^3 kg^{-1} s^{-2})(6.4 \cdot 10^{24} kg)}{3.4 \cdot 10^6 m} }= 5011 m/s = 5.01 km/s$

b) Jupiter:
Jupiter mass is $M=1.9 \cdot 10^{27} kg$ while its radius is $R=7.15 \cdot 10^7 m$ , so the escape speed at its surface is
$v= \sqrt{ \frac{2 (6.67 \cdot 10^{-11} m^3 kg^{-1}s^{-2})(1.9 \cdot 10^{27} kg)}{7.15 \cdot 10^7 m} }=5.95 \cdot 10^4 m/s = 59.5 km/s$

3 0

3 years ago