1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sattari [20]
3 years ago
10

A motorcyclist is making an electric vest that, when connected to the motorcycle's 12 V battery, will warm her on cold rides. Sh

e is using 0.25-mm-diameter copper wire, and she wants a current of 4.3 A in the wire.What length wire must she use?
Physics
1 answer:
storchak [24]3 years ago
8 0

Answer:

8.2 m

Explanation:

We are given that

Potential difference=V=12 V

Diameter=d=0.25 mm

Radius=[r=\frac{d}{2}=\frac{0.25}{2}mm=0.125mm=0.125\times 10^{-3} m

1 mm=10^{-3} m

Current= I=4.3 A

Resistivity of copper wire of\rho=1.68\times 10^{-8}\Omega-m

We have to find the length of wire must she use.

We know that

R=\frac{V}{I}

Using the formula

R=\frac{12}{4.3}ohm

A=\pi r^2=3.14\times (0.125\times 10^{-3})=4.91\times 10^{-8} m^2

Using \pi=3.14

R=\rho\frac{l}{A}

\frac{12}{4.3}=1.68\times 10^{-8}\times \frac{l}{4.91\times 10^{-8}}

l=\frac{12\times 4.91\times 10^{-8}}{1.68\times 10^{-8}\times 4.3}

l=8.2 m

Hence,  she must use the length of wire =8.2 m

You might be interested in
Amy counts the wave crest traveling down a stretched string five wave crests pass Amy in two seconds what is the frequency of th
Gwar [14]
<span>One end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle, theta, with the stick. The coefficient of static friction between the end of the meter stick and the wall is 0.390. A. what is the maximum value...</span>
8 0
3 years ago
Use the ratio version of Kepler’s third law and the orbital information of Mars to determine Earth’s distance from the Sun. Mars
zhuklara [117]

Kepler's third law is used to determine the relationship between the orbital period of a planet and the radius of the planet.

The distance of the earth from the sun is 1.50 \times 10^{11}\;\rm m.

<h3>What is Kepler's third law?</h3>

Kepler's Third Law states that the square of the orbital period of a planet is directly proportional to the cube of the radius of their orbits. It means that the period for a planet to orbit the Sun increases rapidly with the radius of its orbit.

T^2 \propto R^3

Given that Mars’s orbital period T is 687 days, and Mars’s distance from the Sun R is 2.279 × 10^11 m.

By using Kepler's third law, this can be written as,

T^2 \propto R^3

T^2 = kR^3

Substituting the values, we get the value of constant k for mars.

687^2 = k\times (2.279 \times 10^{11})^3

k = 3.92 \times 10^{-29}

The value of constant k is the same for Earth as well, also we know that the orbital period for Earth is 365 days. So the R is calculated as given below.

365^3 = 3.92\times 10^{-29} R^3

R^3 = 3.39 \times 10^{33}

R= 1.50 \times 10^{11}\;\rm m

Hence we can conclude that the distance of the earth from the sun is 1.50 \times 10^{11}\;\rm m.

To know more about Kepler's third law, follow the link given below.

brainly.com/question/7783290.

6 0
2 years ago
Which of these would best describe the outcome of increasing the kinetic energy of the molecules in the above picture?
Lyrx [107]

A) The temperature will increase.

Kinetic energy is the intrinsic energy carried by an object in motion.

Explanation:

Increasing the kinetic energy of the molecules means that molecules rapidly. This causes an increased rate of collision between the molecules and between the molecules and the walls of the container. Most of these collisions are inelastic meaning that some of the energy in the collisions is lost as heat energy to the environment. This means the system becomes hotter.

Learn More:

To understand more on the relations between kinetic energy and temperatures check out;

brainly.com/question/11800512

brainly.com/question/11296583

#LearnWithBrainly

6 0
3 years ago
Read 2 more answers
BRAINLIEST PLEASE HELP ASAP DO NOT ANSWER UNLESS YOU KNOW AND DON'T GIVE ME A LINK OR I WILL REPORT YOU
Korvikt [17]

Answer:

In a third class lever, the effort is located between the load and the fulcrum. ... If the fulcrum is closer to the effort, then the load will move a greater distance. A pair of tweezers, swinging a baseball bat or using your arm to lift something are examples of third class levers.

Explanation:

3 0
3 years ago
1.05 MEASURING PHYSICAL PROPERTIES LAB REPORT
Nana76 [90]

Answer:

<u>Objective(s): In your own words, what was the purpose of this lab? </u>

The purpose of this lab is to get us familiar with the physical properties of different types of materials that are used for building.

<u>Hypothesis: In this section, include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment. </u>

If we use clay brick to build the roof of the house, then the temperature inside the house will remain cooler.

If we use wood to build the walls and floors of the house, then the temperature inside the house will remain cooler.

If we use nickel to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate.

If we use iron to construct the latches on the windows and doors, then the magnetism will keep the latches secure.

<u>Procedure: The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome. </u>

<u>Using the summary questions, clearly define the dependent and independent variables of the experiment. </u>

<u>Data: Record the results of each of your physical property tests in the table below. </u>

Wood _  3/10 _0 _0.12 W/(m·K)  _0 S/m _ 4 g/cm3

Clay Brick _ 2/10 _1 _0.6 W/(m·K) _ 0 S/m _ 5.88235 g/cm3

Iron _ 4/10 _10 _80 W/(m·K)  _1x107 S/m  _9.09091 g/cm3

Aluminum_ 7/10 _ 0  _235 W/(m·K) _ 3.8x107 S/m _ 6.66667 g/cm3

Copper _ 6/10 _0 _400 W/(m·K)  _3.8x107 S/m  _9.52381 g/cm3

Nickel _ 5/10 _7 _ 91 W/(m·K)  _1.4x107 S/m  _9.43396 g/cm3

<u>Conclusion: Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words. </u>

  1. Using two to three sentences, summarize what you investigated and observed in this lab.

In this, I investigated the effect that different types of physical properties had on six different materials. I also investigated which materials would be the best to build a house.  

     2. What building material did you use to build your house? Did your results support or fail to support your hypotheses?

For the roof of my house, I used clay bricks. For the walls and floors of the house, I used wood. To bring electricity into the home I used nickel. To construct the latches on the windows and doors, I used iron. My results supported my hypotheses because clay bricks and wood had the lowest thermal conductivity rates, nickel had the second highest electricity conductivity rate, and iron had the highest magnetism rate.    

      3. What were the densities of the materials you chose for the walls and floor for the home in Tiny World? Why do you think a building material's density is important when building homes or architectural structures?

The density of the material I chose for the walls and floors for the home in Tiny World was 4 g/cm3 (Wood). I think a buildings material density is important when building homes or architectural structures because in order for that structure to stay stable the materials that are used must be dense. If the materials are not dense, the structure would most likely collapse if it is placed under too much pressure.

      4. Why wouldn’t you choose wood or aluminum for the latches on your house?

I wouldn’t choose wood or aluminum for the latches on my house because neither of those two materials are magnetic.

    5. Which material has the highest thermal conductivity? Which material has the highest electrical conductivity? Explain why thermal and electrical conductivity is so high with this material.

Copper has the highest thermal conductivity. Aluminum and copper have the highest electrical conductivity. Thermal conductivity is high in copper because copper is a very thin type of material, and this allows heat to pass through it easily. Electric Conductivity is high in both aluminum and copper because they are both a very thin type of metal and because they are both so thin, electricity will pass through them quickly.  

<u>I'm sorry if any of the answers are wrong, this was just assigned to me and my teacher hasn't graded it yet.</u>

4 0
3 years ago
Other questions:
  • A 2,000-kilogram car uses a braking force of 12,000 Newton to stop in 5 seconds. What is its initial speed of the car?
    7·2 answers
  • A train travels 81 kilometers in 2 hours and then 90 kilometers in two hours. wat is the average speed
    10·1 answer
  • Alicia está a punto de perder su bus. En un desesperado intento, corre a una velocidad constante de 5 m/s. Cuando está a 15 m de
    5·1 answer
  • A measurement must include both a number and a(an)
    5·1 answer
  • An object has a mass of 1kg on Earth. What is its weight on the moon?
    15·1 answer
  • Please help me what defines the above collision as being elastic?
    10·1 answer
  • The magnitude of a component of a vector must be
    5·1 answer
  • A supertrain with a proper length of 100 m travels at a speed of 0.950c as it passes through a tunnel having a proper length of
    6·1 answer
  • A body accelerate uniformly from rest at 2m/s square.Calculate its velocity after traveling 9m
    7·1 answer
  • In a Laundromat, during the spin-dry cycle of a washer, the rotating tub goes from rest to its maximum angular speed of 8.70 rev
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!