Regular wires and cables always have some resistance. So when electric current flows through regular wires and cables, it always loses some energy, It's only a little bit, so we don't usually worry about it.
But if you're the power company, your business is selling electrical energy. If you generate electrical energy at the power plant, and some of it is lost on its way to your customers, then you can't sell the energy that's lost. If you're the power company, then you're shipping ginormous amounts of energy over ginormous distances, and you DO worry about losing any of it.
Strange as it may seem, it turns out that if you ship the electrical energy through the cables at HIGHER voltage, LESS of it gets lost. So the power company wants to send the energy through the cables at the highest-possible voltage. Real power companies use as much as 765 THOUSAND volts to send energy between cities, and 4,800 or 7,200 volts to move it between neighborhoods. (And there's a new long-distance power line in China using 1.1 MILLION volts to move energy a couple thousand miles.)
But this could be a big problem ! You only use 120 volts for most of the things in your house, (or 240 volts for big things like the air conditioner, the stove, or the clothes dryer).
So the power company needs a way to "step down" the voltage from the "transmission line" before they connect the wires into your house.
They use a "step down transformer" to make the electricity suable in houses.
The step-down transformers are the giant square boxes you see on the ground inside the neighborhood power-distribution substation.
And they're the round black cans you see up on the electric poles around the neighborhood.
what were the difficulties
A layer of water Δx m thick which lies x m above the bottom of the tank will be rectangular with length 8 m. Using similar triangles, we can see that it will have widt of_____m
Answer:
x
Explanation:
The question relates to the energy required to pump water out of the
spout at the top of the triangular prism tank.
The width of the layer of water Δx thick is x m.
Reasons:
The location of the layer Δx m thick = x meters above the bottom
The length of the triangular (cross-section) prism tank = 8 meters
The length of the layer Δx thick layer = 8 meters
From the attached drawing of the cross-section of the tank, we have;
The height of the triangular tank cross-section = 3 meters
The length of the base of the triangular cross-section = 3 meters
By similar triangles, we have;
[tex]\dfrac{Height \ of \ Tank}{Base \ length \ of \ tank}= \dfrac{Height \ of \ layer \ with \ thickness \ \Delta x }{Width \ of \ layer \ with \ thickness \ \Delta x}[/tex]
Which gives;
[tex]\dfrac{3}{3} =\dfrac{x}{Required \ width}[/tex]
[tex]\dfrac{3}{3} =1 = \dfrac{x}{Required \ width}[/tex]
Required width × 1 = x
The required width = x m
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Which changes with location?
1weight and gravity
2gravity
3weight
4mass
Answer:
fxfvhzsegjyfetvhtde ftgfrdedddfvygy
Explanation:
mass
What are some of the similar features of position vs time and velocity vs time
Wavelength in one full standing wave
Answer: one complete wave in a standing wave pattern consists of two loops. Thus, one loop is equivalent to one-half of a wavelength
Explanation: I hope that helped- Please mark me as brainliest!
Answer:
the standing wave within =1 oscillates at the fundamental frequency and has a wavelength that is twice the length of the string . Higher integer value of n correspond to mode of oscillation called harmonics or overtones . Any standing waves on the string will have n +1 node including the fixed end and n anti-nodes.
I hope that helped.Plzz mark me as brainliest
1. If a rock is dropped from a 600 meter cliff, how long will it take to hit the ground?
Dl
Answer:
11.1s
Explanation:
Given parameters:
Height of cliff = 600m
Unknown:
How long it takes to hit the ground = ?
Solution:
To solve this problem, we use one of the kinematics equation;
H = ut + [tex]\frac{1}{2}[/tex]gt²
H is the height
u is the initial velocity = 0m/s
t is the time taken
g is the acceleration due to gravity
600 = [tex]\frac{1}{2}[/tex] x 9.8 x t²
600 = 4.9t²
t² = 122.5
t = 11.1s
Why would a cell phone not make a sound in space?
Answer:
because there is no sound in space
A golfer collected data on the distance a golf cart traveled in a straight line and plotted it on a graph
Which of these does NOT describe the cart’s motion on this graph?
The cart was at rest between 5 s and 7 s.
The cart moved toward the starting point between 7 s and 12 s.
The cart moved away from the starting point between 8 s and 10 s.
The cart moved away from the starting point between 2 s and 5 s.
Answer:
The cart moved away from the starting point between 8 s and 10 s.
Explanation:
Given that :
Which of these does NOT describe the cart’s motion on this graph?
The cart was at rest between 5 s and 7 s : From the distance of golf cart Vs time graph ; the car was at rest between 5s and 7s as the graph was flat with that time interval, meaning there was no change in distance.
The cart moved toward the starting point between 7 s and 12 s. : The graph depicts a negative slope at this time interval as the distance from starting point fell from about 26 m to 10 m
The cart moved away from the starting point between 8 s and 10 s. : At this time interval, the cart moved towards the starting not and not away. This could be seen in the decrease in Distance from starting point between the tune interval.
The cart moved away from the starting point between 2 s and 5 s. - - > The cart moved away from the starting point, with the positive slope signifying an increase in distance.
Therefore, The cart moved away from the starting point between 8 s and 10 s does not describe the motion of the cart on the graph.
most of the energy we use on earth comes from the sun—how does that energy(light and thermal)end up?
As ____energy in our food
As ____energy of wind or moving water
As ____energy that was our lights
As ____energy when we move around
Which factor is a component of skill-related fitness?
Answer:
There are six skill-related fitness components: agility, balance, coordination, speed, power, and reaction time. Skilled athletes typically excel in all six areas. Agility is the ability to rapidly and accurately change the direction of the body.
Explanation:
Calculate the weight in Newtons of a person who has a mass of 69 kg.
when talking about Acceleration ,what is significant about the about the sign(+ or -)?
Answer:
Acceleration at its most basic is the act of increasing your running speed. From a standing start (or blocks), you explode into action. If you’re already running, you pick up the pace. Acceleration continues until you can no longer increase your speed, at which point you achieve maximum velocity (top-end speed). Acceleration seems simple enough. The plus means your increasing speed, the k=minus means your decreasing in speed.
Explanation:
Which force is an attractive force that is affected by the masses of objects?
A) tension force
B) magnetic force
C) normal force
D) gravitational force
Class: Physical Science B
Answer:
D) gravitational force
1. A brick and a peanut are dropped of the roof of a house at the same time, which
object hits the ground first? (Ignore air resistance).
Answer:
It would be the brick since the mass and the weight is greater than the peanut I might be wrong on this but thats the best answer i can give
Explanation:
Suppose a worker is pushing a
wheelbarrow. He used a force of 625N to
perform 3500J of work on the wheelbarrow.
How far did he push it?
F 5.6 m
G
0.18 m
H
10.2 m
J
14.3 m
Answer:
5.6m
Explanation:
given
Applied force(F)=625N
workdone(w)=3500J
distance travelled by wheel barrow(s)=w/F
= 3500/625
= 5.6m
Tiny cell structure that carry out specific functions within the cell
Answer:
Organelles
Explanation:
I learned this in science.
Two charged objects originally felt 12N of attraction. One charge
is changed from 3C to 6C and their distance changes from 15cm
apart to 45cm apart. What is the new force of attraction?
Answer:
The new force of attraction will be [tex]F_{new}=2.67\: N[/tex]
Explanation:
The electrostatic force equation is given by:
[tex]F=k\frac{q_{1}q_{2}}{r^{2}}[/tex]
Where:
q(1) is the first charge, let's use this one to the 3 Cq(2) is the second charger is the initial distance (r = 0.15 m)Then, the original force could express as:
[tex]F_{original}=k\frac{3q_{2}}{0.15^{2}}=12[/tex]
This force is 12 N.
Now, we know that q(1) changes its value to 6 C and the new distance between the charges is 0.45 m, which means:
[tex]F_{new}=k\frac{6q_{2}}{0.45^{2}}[/tex]
We can rewrite this force in terms of the original force.
[tex]F_{new}=k\frac{2\cdot 3q_{2}}{(3\cdot 0.15)^{2}}[/tex]
[tex]F_{new}=\frac{2}{9}k\frac{3q_{2}}{0.15^{2}}[/tex]
[tex]F_{new}=\frac{2}{9}F_{original}[/tex]
[tex]F_{new}=\frac{2}{9}12[/tex]
Therefore, the new force of attraction will be [tex]F_{new}=2.67\: N[/tex]
I hope it helps you!
Can anyone please help meee!!!
Answer:
The centripetal acceleration is given by
a = v 2 r = 10 2 25 = 4 m s − 2
Using Newton's Second Law, the centripetal force acting is
F = m a = 900 ⋅ 4 =3600 N
Explanation:
If a 2 kg spring is compressed by exerting a force of 10 newtons a distance of 50 cm how much work is done?
When the
temperature of the air in a
hot air balloon increases,
what happens to the
volume of the gas?
Answer: What do you think happens to the volume of gas inside the balloon? As the temperature increases, the gas particles absorb more heat energy. They speed up and move farther away from one another. So the increase in temperature causes an increase in volume.
Explanation:
a train is sitting still at the top of 990-m mountain. it then coasts down the mountain and back up another mountain that is 520 m high. what is the train's speed at the top of the second hill?
Answer:
Explanation:
At the top of 520 m high mountain , the train will lose potential energy due to loss of height from 990 m to 520 m and gain kinetic energy .
Loss of height = 990 - 520 = 470 m
Loss of potential energy = m x g x 470 where m is mass of the train .
Gain of kinetic energy = 1/2 m v² where v is velocity of train at the top of 550 m high mountain .
1/2 m v² = m x g x 470
v² = 2 x 9.8 x 470
v = 95.98 m /s
a girl is riding her bike and coasting down a hill. When she gets to the bottom of the hill, her bike continues to move without her pedaling. What type of energy is her bike using ?
a. potential
b. kinetic
c. solar
d. thermal
y’all, i have so many more questions
Answer:
Her bike is using kinetic energy
B
Explanation:
Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes.
Answer:
food chain / web lol? was this a question?
John flies directly east for 20km, then turns to the north and flies for another 10 km before dodging a flock of geese. what’s the distance and displacement?
Answer:
displacement: 22.4 distance 30km
Explanation:
hope I helped
The required distance and displacement are both approximately 22.36 km.
What are Pythagorean triplets?In a right-angled triangle, its sides, such as the hypotenuse, are perpendicular and the base is Pythagorean triplets.
Here,
The distance John travels is the total length of his path, which can be found using the Pythagorean theorem since he forms a right-angled triangle:
Distance = √(20² + 10²) = √500 = 10√5 ≈ 22.36 km
To find the displacement, we need to draw a straight line from John's starting point to his ending point, which forms the hypotenuse of the right-angled triangle. The length of this line is the displacement.
The displacement is equal to the distance between John's starting point and his ending point, which can be found using the Pythagorean theorem as well:
Displacement = √20² + (10 km - 0 km)²
= √400 + 100 = √500
= 10√5 ≈ 22.36 km
So, the distance and displacement are both approximately 22.36 km.
Learn more about Pythagorean triplets here:
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Which has the greater volume?
A. wood
B. white block
C. equal
Answer:
B.white block
hope it's the answer ....❤❤❤❤❤❤
In which of these can plasma be
found?
lightning
neon signs
microwave ovens
all of these
Answer:
The sun and other stars consist of plasma. Plasma is also found naturally in lightning and the northern and southern lights. Human-made plasma is found in fluorescent lights, plasma TV screens, and plasma spheres
Explanation:
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HELPPPPPPP!!!!!
why are cations drawn towards cathode and anions towards anode?
Explanation:
Cations are positive and anions are negative, since opposite charged attract, the cations are drawn towards the cathode, which is the negatively charged electrode and anions are drawn towards the anode (positive electrode)
Answer:
because cations are negatively charged particles and their attracted towards a positive electrode that is anode while anions and positively charged particles and I attracted towards the negative electrode that is cathode
Explanation:
a girl pushes her little brother down a snowy hill on a sled and he rides quickly to the bottom of the hill
which one of Newton's Laws is this
Answer:
Newton's First Law of Motion.
Explanation:
Inertia can be defined as the tendency of an object or a body to continue in its state of motion or remain at rest unless acted upon by an external force.
In physics, Sir Isaac Newton's First Law of Motion is known as law of inertia and it states that, an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.
In this scenario, a girl pushes her little brother down a snowy hill on a sled and he rides quickly to the bottom of the hill. The push from the little boy's sister is the external force acting on him and consequently, causing him to be in motion down the snowy hill.
Which best explains how thermal energy is transferred when someone holds a hand above a fire?
a) It is transferred by conduction and radiation.
b) It is transferred by only convection.
c) It is transferred by only conduction.
d) It is transferred by radiation and convection.
What type of wave is created here?
A) longitudinal
B) transverse
Help me plssss!!!
Answer:
b
Explanation:
Answer:
this is a longitudinal wave!!!
Explanation:
because you can see the compressions and rarefactions.