A piece of wire length 30cm and cross sectional area of 0.5mm^2 has a resistance of 5ohms at 20°c. It is then heated to a temperature of 150°c. Calculate it's resistivity at 20°c

Answers

Answer 1

Answer:

8.333*10^-6 ohms

Explanation:

Resistivity of a material is expressed as;

p = RA/l

R is the resistance of the material

A is the cross sectional area

l is the length of the material

Given

R = 5 ohms

A = 0.5mm^2

A = 5 * 10^-7m^2

l = 30cm  = 0.3m

Substitute into the formula;

p = (5 *  5 * 10^-7m^2)/0.3

p = 25 * 10^-7/0.3

p = 0.0000025/0.3

p = 8.333*10^-6

Hence its resistivity at 20 degrees Celsius is 8.333*10^-6 ohms


Related Questions

is boiling water in a kettle on a stove kinetic or potential energy?

Answers

Answer:

Boiling a kettle is an example of both thermal and kinetic energy. Thermal energy comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature. Heat energy is another name for thermal energy. Kinetic energy is the energy of a moving object.

it's kinetic!

NEED HELP ASAPTsunamis are often called tidal waves because they are caused by tides.

o True

o False

Answers

Answer:

false

Explanation:

a tsunami is almost always caused by an earthquake under water.

you do no know an objects velocity until you know its _____.

Answers

I agree with the answer above, but since velocity is a vector, I think displacement would be a better answer :)

After reading a book, Julio looks out of the window and sees clouds in the distance. Which change allows Julio to clearly see the clouds after looking at his book? His corneas become flatter. His lenses change shape. His optic nerves begin sending signals. His vitreous humor becomes denser.

Answers

Answer:

Lens change

Explanation:

by changing the shape of the lens the rays from the clouds will be able to refract correctly in the lens then create the correct upside-down image on the retina.

Hope it helped

PLS mark BRAINLIEST

Answer:

His lenses change shape.

Explanation:

just took the quiz

A cinder block is sitting on a platform 10 m high. It has a mass of 25 Kg. What is the potential energy

Answers

Answer:

2450J

Explanation:

PE = mgh

PE = (25)(9.8)(10)

what ways might a superhero utilize magnetic forces to move, levitate or travel from place to place?

Answers

Answer:

He could use magnets to lift heavy things and also move things like a train

Explanation:

i had the same question

Please help and thank you

Answers

Answer:

B. C3H8

Chemical Formula for propane is C3H8

Gizmo uniform circular motion

Answers

ok that looks boring

Which methods reduce friction?

increasing speed
lubricating surfaces
using sticky materials
increasing surface roughness

Answers

The answer is Lubricating surfaces

Answer:

The answer would be B. Lubricating surfaces.

Explanation:

Mark brainliest pls

Which is not a measurement of effort for exercises or activity?

repetitions


time
distance

elevation

Answers

I thinks it repetitions.

Which equation determines the acceleration of an object moving in a straight line?

You must calculate the change in speed per unit of time.

Group of answer choices

Acceleration = ( initial speed - final speed ) / time

Acceleration = time / ( initial speed - final speed)

Acceleration = time / ( final speed - initial speed)

Acceleration = ( final speed - initial speed ) / time

Answers

Answer:

Option D

Last option

GOOD LUCK FOR THE FUTURE! :)

What does each system help you do?
1 Somatic Nervous System
2 Autonomic Nervous System
3 Sympathetic Division
4 Parasympathetic Division
5 Hormones

Answers

Explanation:

1.The somatic nervous system is the part of the peripheral nervous system associated with the voluntary control of body movements via skeletal muscles. 

2. The autonomic nervous system is a control system that acts largely unconsciously and regulates bodily functions, such as the heart rate, digestion, respiratory rate, pupillary response, urination, ect...

3. Sympathetic Division is a term used by researchers and medical practitioners to describe the subdivision of the autonomic nervous system (that controls involuntary and automatic physical reactions) that responds to emergency situations by mobilizing and controlling the energy necessary to cope with the situation.

4. The part of the autonomic nervous system that tends to act in opposition to the sympathetic nervous system, as by slowing down the heart and dilating the blood vessels. It also regulates the function of many glands, such as those that produce tears and saliva.

5. a regulatory substance produced in an organism and transported in tissue fluids such as blood or sap to stimulate specific cells or tissues into action.


What is the speed of a 180 g ball if its kinetic energy is 100 J?

Answers

Answer:

Velocity, V = 33.33 m/s

Explanation:

Given the following data;

Mass = 180grams to kilograms = 180/1000 = 0.18 kg

Kinetic energy = 100J

To find the speed;

Kinetic energy can be defined as an energy possessed by an object or body due to its motion.

Mathematically, kinetic energy is given by the formula;

[tex] K.E = \frac{1}{2}MV^{2}[/tex]

Where;

K.E represents kinetic energy measured in Joules.

M represents mass measured in kilograms.

V represents velocity measured in metres per seconds square.

Substituting into the equation, we have;

100 = ½*0.18*V²

Cross-multiplying, we have;

200 = 0.18*V²

V² = 200/0.18

V² = 1111.11

Taking the square root of both sides, we have;

Velocity, V = 33.33 m/s

Which type of earthquake waves are responsible for most of the damage caused by an earthquake? Why?
please helppppp its due tomorrow

Answers

Answer:

Surface waves travel along the surface. There are two types of body waves: P-waves travel fastest and through solids, liquids, and gases; S-waves only travel through solids. Surface waves are the slowest, but they do the most damage in an earthquake.

Answer:

surface waves

Explanation:

they have the strongest vibration and can cause the most damage

PLEASE HELP ASAP!!!!!

Answers

Answer:

MOSE

Explanation:

I NEED HELP
The average kinetic energy of the particles of two pieces of iron at the same temperature and mass would be __________.

Question 1 options:

Different


The same


Not equivilent


With in 500 degrees of eachother

Answers

Answer:

the answer is different

Explanation:

i took the test

What color rays have the smaller/lesser angle

Answers

Answer:

Blue?

Explanation:

What is the potential energy at Z

Answers

Answer:

It would be 2,500

Explanation:

The KE is 7,500 so the PE would be 2,500

Do you think we might have problems with not enough water to supply our needs (water scarcity) in the
ture? Why or why not? If you answered yes, what might the causes be?

Answers

Answer:

Water scarcity (water stress or water crisis) is the lack of fresh water resources to meet the standard water demand. Humanity is facing a water crisis, due to unequal distribution (exacerbated by climate change) resulting in some very wet and some very dry geographic locations, plus a sharp rise in global freshwater demand in recent decades driven by industry. Water scarcity can also be caused by droughts, lack of rainfall, or pollution. This was listed in 2019 by the World Economic Forum as one of the largest global risks in terms of potential impact over the next decade.[1] It is manifested by partial or no satisfaction of expressed demand, economic competition for water quantity or quality, disputes between users, irreversible depletion of groundwater, and negative impacts on the environment.[2] Two-thirds of the global population (4 billion people) live under conditions of severe water scarcity at least 1 month of the year.[3][4][5][6] Half a billion people in the world face severe water scarcity all year round.[3] Half of the world's largest cities experience water scarcity.[5]

PLEASE READ CAREFULLY. AND PLEASE MARK AS BRAINLIEST

Which quantity must be the same for two bodies in thermal equilibrium?
А Total internal energy of the particles in the two bodies are the same.
B Total kinetic energy of the particles in the two bodies are the same.
C Temperature of the two bodies are the same.
D State of matter of the two bodies are the same.​

Answers

C. Temperature of the 2 bodies are the same

a trolley of mass 20kg was originally at rest on a smoth horizontal surface. bu how much will it accelerate if a pulling force of 22N is applied on it horizontally?​

Answers

Answer:

just divide 22 N by 20 kg to get the acceleration in m/s2

Explanation:

I hope this is right-

One of the signs a chemical reaction is taking place

Answers

Answer:  One of the signs a chemical reaction is taking place is the presence of bubbles. :)

While standing at home plate, a batter swung a 2.5kg bat at 2.5 m/s toward an incoming mass. The mass was a 0.4 kg blob of clay, thrown toward the batter at 26 m/s, which stuck the the bat in an inelastic collision. What velocity of the velocity of the bat and blob of clay (which are stuck together) after the collision? Help fast will give brainliest
Show work

Answers

Answer:

5.74 m/s

Explanation:

m1v1+m2v2=(m1+m2)*vf

2.5*2.5+0.4*26=(2.9)vf

16.65=2.9vf

vf=5.74 m/s

Donna shines a flashlight and a laser pointer on a sheet of paper. She holds each device at an equal distance from the paper. How does the light hitting the paper from each device appear different?

The light from the flashlight lights up a larger area of the paper.
The light from the laser pointer lights up a larger area of the paper.
The light from the flashlight magnifies a larger area of the paper.
The light from the laser pointer magnifies a larger area of the paper.

Answers

Answer:

A the light on the flash light lights up a bigger area

I'm pretty sure this is right.

Explanation:

Answer:

a

Explanation:

A certain element has a half-life of 200 years. How much of a 1600 gram sample would be left after 800 years?

Answers

2222222×7÷4÷5+6(8×9)

Please help ill give out brainliest?!!!

Answers

Air resistance because heavy object don’t get affect by air resistance than light object so
Because acceleration is inversely proportional to mass.

Explain how you can locate the Pole Star with the help of Ursa Major?​

Answers

Answer: Pole star can be located using Ursa Major by extending an imaginary line from the last two stars towards the North direction.

Explanation:

Answer:

The pole star can be located using the Ursa Major constellation, by imagining a line towards the Northern direction connecting two stars present at the end of the bowl, This imaginary line meets Pole Star. The length of the imaginary line from the bowl is about five times the distance between the two stars of the bowl.

Explanation:

How are ultraviolet waves used for communication​

Answers

Can you include a picture

An object is moving to the right at a constant velocity. What will happen if a
force of 20 N starts acting on it in the opposite direction?
А
The object's velocity will increase.
B
The object's velocity will decrease.
с
The object will come to a stop.
D
The object will move at the same velocity.

Answers

Answer:

A

Explanation:

just trust me

Given an objects mass and observing its acceleration what can be found in a direct application of Newton’s second law of motion?

Answers

Hahaha +Hajiya ooiOqo0191
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