A copper wire of length L and cross-sectional area A has resistance R. A second copper wire at the same temperature has a length of 2L and a cross-sectional area of A. What is the resistance of the second copper wire?
A. 2R
B. 4R
C. R
D. 1/2 R

Answers

Answer 1

Answer: 4R

Explanation:R=pL/A

R second wire=p2L/1/2A

=4R


Related Questions

PLEASE HELP ASAP EXPLAIN PLEASE
you’ve learned about the intricate network of structures that comprise the respiratory system and how crucial it is to ensure that all pieces of this system remain in top condition. You also learned that smoking tobacco, cannabis, or other substances can have a significant impact on not only the overall health of the lungs but also has negative effects on all body systems. Using this new information, and with independent research, you are now asked to develop a learning package for someone who has come to you for health teaching. Imagine that you are either a nurse in a clinic, a personal trainer, a physiotherapist, or any other health practitioner who has just done an initial consultation with a patient. Your patient has disclosed that they smoke tobacco and they have indicated that they believe that the information about lung disease and smoking is fabricated and that it must be exaggerated. You are now tasked with showing them through a diagram and a verbal demonstration the true scientific facts around smoking and lung disease. Make sure to discuss the symptoms, prevention, diagnosis, and treatment in your demonstration. You will use either a diagram of the respiratory system that you’ve found online or one that you’ve drawn by hand to support your teaching. You will develop a script and teach the material to either an imaginary person or someone else and videotape your lesson.

Answers

Answer:

How can smoking affect the respiratory system?

Smoking and Respiratory Disease

Smoking can cause lung disease by damaging your airways and the small air sacs (alveoli) found in your lungs. Lung diseases caused by smoking include COPD, which includes emphysema and chronic bronchitis. Cigarette smoking causes most cases of lung cancer.

Explanation:

I cannot create videos. However, I can help you develop a script for your health teaching package.

Your lungs and general health can be significantly impacted by smoking tobacco and other substances. It's crucial to comprehend the actual scientific data and take action to manage and avoid respiratory illnesses. Do not hesitate to ask if you have any queries or concerns.

What is the impact of smoking tobacco and other substances on the lungs and general health?

Hello, and thank you for coming to me for health teaching. I understand that you smoke tobacco, and you may have doubts about the impact it can have on your lungs and overall health. I'm here to show you the true scientific facts around smoking and lung disease.

Let's start with the respiratory system. The respiratory system is made up of many intricate structures that work together to deliver oxygen to your body and remove carbon dioxide. When you inhale smoke from tobacco or other substances, you introduce harmful chemicals into your lungs that can damage these structures.

Over time, smoking can lead to a range of respiratory diseases, including chronic bronchitis, emphysema, and lung cancer. Symptoms of these diseases can include coughing, wheezing, shortness of breath, and chest pain. These symptoms can significantly impact your quality of life and even be life-threatening.

Prevention is key when it comes to respiratory diseases caused by smoking. The best way to prevent these diseases is to quit smoking altogether. If you're struggling to quit, there are many resources available to help you, including nicotine replacement therapy and counseling.

If you're experiencing symptoms of a respiratory disease, it's important to seek medical attention. Your doctor can diagnose the disease and recommend a treatment plan that may include medication, lifestyle changes, and possibly surgery. Early diagnosis and treatment can greatly improve your chances of recovery and help you manage your symptoms.

Now, let me show you a diagram of the respiratory system so you can see how smoking affects it. [At this point, you can show the diagram and point out the different structures affected by smoking, such as the bronchi and alveoli.]

Therefore, smoking tobacco and other substances can have a significant impact on your lungs and overall health. It's important to understand the true scientific facts and take steps to prevent and manage respiratory diseases. If you have any questions or concerns, please don't hesitate to ask.

To learn more about The benefits of soy click:

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(b) The efficiency of the pump which operates the fountain is 70%.
Calculate the power supplied to the pump.​

Answers

Answer:

Power supplied to the pump is 980000 W or 980 KW

Note: The question is incomplete. The complete question is given below:

On a day with no wind, a fountain in Switzerland propels 30000 kg of water per minute to a height of 140 metres.

a)Calculate the power used in raising the water?

b)The efficiency of the pump which operates the fountain is 70%

calculate the power supplied to the pump?

Explanation:

Efficiency = Power output/Power input * 100%

Power output = work done/ time

where work done = mass * acceleration due to gravity (g) * height

time = 1 minute = 60 seconds

mass of water = 30000 kg, height = 140 meters, g = 9.8 m/s²

Then, work done = 30000 * 140 * 9.8 = 41160000 J

Power output then = 41160000 J / 60 s

Power output = 686000 W

The power input can then be derived from the formula of efficiency

Power input = (Power output * 100)/Efficiency

Power input = (100 * 686000) / 70

Power input = 980000 W

Therefore, power supplied to the pump is 980000 W or 980 KW

My dream house

Read the text. Drag the words to fill in the gaps to complete it.

stay

electronic

porch

My dream house has lots of rooms and windows. It has a big red front door. There is also a

with a round table and several chairs around it.

There is a living room with comfortable sofas and a big TV screen on the wall. My family likes to spend time together watching TV. In the attic, there is a game room for me and my friends. It has a fridge for drinks and snacks. There are extra bedrooms. My friends can

 there at night.

My bedroom is green. Green is my favourite colour. There are lots of shelves for my toy car collection. I am a fan of old cars.

There are lots of posters of my favorite actors and singers. And there is also an

clock that shows the time on the screen.

There is also a new computer, a sound system, and a telescope because I love astronomy. My bed is special. It is in the shape of a car, and it is very comfortable. My bed is next to the window.

Back

Check​

Answers

Answer:

1 - porch, 2 - stay, 3 - electronic

During heavy rain, a section of a mountainside measuring 1.9 km horizontally (perpendicular to the slope), 0.55 km up along the slope, and 2.4 m deep slips into a valley in a mud slide. Assume that the mud ends up uniformly distributed over a surface area of the valley measuring 1.4 km x 1.4 km and that the mass of a cubic meter of mud is 1900 kg. What is the mass of the mud sitting above a 3.5 m2 area of the valley floor

Answers

Answer:

the mass of the mud sitting above a 3.5 m2 area of the valley floor is 8509273.5 kg

Explanation:

Given the data in the question;

first we compute the total volume of mud

V = ( 1.9×1000)m × (0.55×1000)m × (2.4×1000)m

V = 2.508 × 10⁹ m³

same volume of mud spread uniformly over 1.4 × 1.4 km² area

Hence,

V = (1.4×1000)m × (1.4×1000)m × depth

2.508 × 10⁹ = 1400m × 1400m × depth

2.508 × 10⁹ m³ = 1960000m² × depth

depth = 2.508 × 10⁹ m³ / 1960000 m²

depth = 1279.59 m

so volume of the mud sitting above 3.5 m² area of the valley floor will be;

⇒ 3.5 m² × 1279.59 m

⇒ 4478.565 m³

so mass will be

m = 4478.565 × 1900 kg

m = 8509273.5 kg

Therefore, the mass of the mud sitting above a 3.5 m2 area of the valley floor is 8509273.5 kg

Can heating cooking oil you’ll be classified as producing a chemical change?

Answers

yes it is boiling creating bubbles that aren't their originally

Explanation:

When cooking oils are subjected to heat in the presence of air and water (from food), such as in deep-fat frying and sautéing (pan frying), they can undergo at least three chemical changes: 1) oxidation of the fatty acids, 2) polymerization of the fatty acids, and 3) breaking apart of the triglyceride molecules into free fatty acids and glycerol by hydrolysis (reaction with water from the food being cooked) (Choe and Min 2007)

An astronaut on a spacewalk pushes off of the outside of the spaceship. Compare the force of the astronaut on the ship to the force of the ship on the astronaut. Compare the astronaut's change in momentum to the spaceship's change in momentum. Compare the astronaut's change in velocity to the spaceship's change in velocity​

Answers

Answer:

and yes, sound travels at the speed of entity expressions is whhy you need math for a job in mc donalds :

293 x gj -2 = 23r = velocity of rocket ship is 2.74

Explain why stones are strong in compression but weak in tension ​

Answers

Answer:

Gigantic towers, monuments and tall structures are always supported by a very thick layer of concrete that’s blended into their foundation. The purpose of this is quite straightforward: nothing provides greater support to a super heavy (and stationary) structure than a layer of concrete.  There may be other things that, in theory, could provide a stronger foundation, but they wouldn’t be nearly as cost effective as concrete.

Answer:

Because it has essentially zero strength in tension, it is almost always used as reinforced concrete, a composite material. It is a mixture of sand, aggregate, cement and water.

The north pole of a magnet is brought near to the current-carrying solenoid.
State whether the north pole is attracted or repelled by the solenoid. Explain why.

Answers

Answer:

The north and south pole of a solenoid depends on two factors. One, the direction of the current flow and two, the direction of the winding (clockwise or counter-clockwise). ... If clockwise in relation to the positive wire then is the south pole, if anti-clockwise then is the north pole.

Explanation:

The north and south pole of a solenoid depends on two factors. One, the direction of the current flow and two, the direction of the winding (clockwise or counter-clockwise). ... If clockwise in relation to the positive wire then is the south pole, if anti-clockwise then is the north pole.

The amount of energy a substance has depends on the state of matter
the substance is in at the time.

True
or False

Answers

False I believe!
Hope it’s right!
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