Answer:
[tex]l=L\alpha(T_c-T)[/tex]
Explanation:
L = Initial length of segment = 79 m
T = Normal temperature = [tex]20^{\circ}\text{C}[/tex]
l = Width to be left for expansion
[tex]\alpha[/tex] = Coefficient of linear expansion of the material = [tex]12\times 10^{-6}^{\circ}\text{C}^{-1}[/tex]
[tex]T_c[/tex] = Maximum temperature = [tex]39.5^{\circ}\text{C}[/tex]
[tex]\Delta T[/tex] = Change in temperature = [tex]T_c-T[/tex]
The expression of linear expansion is given by
[tex]l=L\alpha\DeltaT\\\Rightarrow l=L\alpha(T_c-T)[/tex]
The expression for the minimum gap distance l the engineers must leave for a track rated at temperature [tex]T_c[/tex] is [tex]l=L\alpha(T_c-T)[/tex]
Motion happens whenever
Answer:
one object exerts a force on a second object
Explanation:
i just took this
What is the momentum of a 10 kg object traveling at 4 m/s?
explain how the colors of the rainbow are formed
Explanation:
a ray of light pass through raindrops which acts like prism and split the light into its 7 constituent...which when seen by our eyes , we presume it to be a rainbow
Tanya randhawa is standing on top of a train that is traveling at 7 km/sec. The train hits a cow and comes to a complete stop. There is no gravity or friction in Tanyas world. According to newton's first law what happens to tanya
Answer:
Since there is no gravity or friction in Tanya's world, according to Newton's first law she will keep moving at a constant speed.
Explanation:
Newton's First Law, or also called the Law of Inertia, postulates that every body that is not subjected to any interaction (free or isolated body) remains at rest or moves with constant speed. In other words, it is not possible for a body to change its initial state (whether of rest or motion) unless one or more forces intervene.
In this law then the net force (Σ F) applied on a body is equal to zero and explains that to modify the state of motion of a body it is necessary to act on it.
Tanya randhawa is standing on top of a train traveling at 7 km / sec and the train collides with a cow and comes to a complete stop. Since there is no gravity or friction in Tanya's world, according to Newton's first law she will keep moving at a constant speed.
Three women push a stalled car. Each woman pushes with a 425N force. What is the mass of the car if the car accelerates at 0.85m/s2?
Reflection is when waves bounce back and Rarefactions are when waves change speed in a new medium.
true or false
Answer:
False
Explanation:
If I am not mistaken reflection is when light bounces off of a surface such as snow,water,glass ect. and refraction is when,the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density?
Question 1 of 10
A decorative magnet sticks to a refrigerator door. What are two possible
materials that could be in the door?
A. A magnetic material, such as iron
B. Another magnet
C. Any material used as insulation
D. A ceramic material
please help!!!
A magnetic material, such as iron are two possible materials that could be in the door. So, the correct option is (A).
What is Magnet?
A magnet is defined as a material or object that produces a magnetic field where the magnetic field is invisible but is responsible for the most notable property of a magnet: a force that attracts metals such as iron, steel, nickel, cobalt, among others. attracts or repels ferromagnetic materials, etc. and other magnets.
Magnet is describe as the object which is capable of producing magnetic field and attracting unlike poles and repelling like poles. When the magnet is dipped in iron filings, we see that the iron filings stick to the ends of the magnet due to magnet attraction being maximum at the ends of the magnet, hence the ends are known as the poles of the magnet .
Thus, a magnetic material, such as iron are two possible materials that could be in the door. So, the correct option is (A).
Learn more about Magnet, here:
https://brainly.com/question/2841288
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How does an object gain potential energy
A) by melting
B) by gaining speed
C) by cooling to a lower temperature
D) by being raised above the ground
Answer:
d
Explanation:
Answer:
D
Explanation:
Gravitaional potential energy is energy that is stored by moving an object to a greater height above the ground.
im not sure if its right, but i tried :)
An object is traveling with a constant velocity of 5 m/s. How far will it have gone after 7 s?
Answer:
35 miles
Explanation:
5 times 7
Which two terms describe the relationship between the two variables in this graph?
The muscular system supports the body with structure.
true or false
Answer:
False I think
Explanation:
My reason why is because the muscular systems is when the brain sends signals to move the body
Define potential difference in a uniform electric field?
Explanation:
For example, a uniform electric field E is produced by placing a potential difference (or voltage) ΔV across two parallel metal plates, labeled A and B. ... The relationship between ΔV and E is revealed by calculating the work done by the force in moving a charge from point A to point B.
When a satellite is in orbit around the earth the force of gravity on the satellite-
Answer:
Is always towards the center of the Earth
Explanation:
As a satellite moves around the Earth in a circular orbit, the direction of the force of gravity is always towards the center of the Earth. At an altitude of 100 km, you would be so high that you would see black sky and stars if you looked upwards.
Heat moves from hot to cold either through air or liquid
Answer:
both
Explanation:
because when it is hot in summer 5hat is the air and the sund u can warm things up and then it get hot
Children should be able to speak clearly and understandably by:
One year old.
Two years old.
Three to four years old.
Four to five years old.
After five.
Answer:
3 to 4
Explanation:
By the time they reach 3 they have achieved speaking 200 or even more
What are the different forms of treatments available for somatoform disorders?
Answer:
Treatment options include medications, particularly tricyclic antidepressants and SSRIs,21,22 and psychotherapy. Nonpharmacologic treatment strategies (e.g., massage, acupuncture) may also be beneficial. patients initially presented with symptomatic pain due to a shoulder injury.
Somatoform disorders can be treated by psychotherapy and through medications.
What are somatoform disorders?Somatoform disorders are a group of psychiatric disorders whereby patients have a wide variety of clinically significant but unexplained physical symptoms.
The treatment options for somatoform disorders include:
PsychotherapyMedications Yoga and meditationAcupunctureTherefore, somatoform disorders can be treated by psychotherapy and through medications.
Learn more about somatoform disorders at: https://brainly.com/question/27251201
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explain why wind and wave power could not be relied on to provide a country's entire electricity supply .
Answer:
because if the plant that produced that type of energy broke down you would need another type of energy to replace it.
Explanation:
A book is at rest on a table. Identify the correct free-body diagram for this situation.
Answer:
the 3rd pic is correct
Explanation:
because the arrows are going away from each other.
help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
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Once a person passes the age of 65, he or she should stop exercising.
Please select the best answer from the choices provided.
ОТ
OF
Answer: False
People age 65 and older still need exercise. Although the intensity of each workout won't be as high compared to younger ages. Everyone needs exercise to keep their heart healthy, to lower the bad cholesterol, etc.
Answer:
no
Explanation:
very false
How would I find the average distance for this?
Answer:
Explanation:add them then divide them by 100 I think
What are carbon-12, carbon-13, and carbon-14?
Answer:
They are all Carbon isotopes. Carbon 13 has 6 protons and 7 neutrons
Explanation:
Hope this was helpful! :)
PLEAASSEEEE HELLLPPPP !!!
Answer:
a = 3.5 m/s^2
Explanation:
a basic equation of physics is f = ma
we can rearrange that to a= f/m
so plug in your values: a = 175 / 50
you get a = 3.5 m/s^2
ANOTHER 40 POINTS!!!
Why is it important for a system of objects to be isolated in order for the law of conservation of energy to apply?
A. The energy of each object in the system must not change.
B. The system must not exchange energy with other systems.
C. Energy must be able to freely move in and out of the system.
D. The type of energy that each object in the system has must always remain the same.
Did you mention the correct independent variable – the substance’s properties (such as solubility, conductivity, and state of matter)?
yes
no
somewhat
Did you mention the correct dependent variable – the type of bond, ionic or covalent?
yes
no
somewhat
Answer:
1. Somewhat 2.Yes
Explanation:
Answer:
C,a
Explanation:
2.0 A are flowing through an electric motor. How long will it take for 40 Coulombs to flow through the motor?
Answer:
Answer: Magnitude = [____]; unit = [____].
Explanation:
When does hurricane season peak in the Atlantic Ocean?
Answer: 1 June to 30 November
Answer: Usually the Atlantic hurricane season usually peaks through August to September and usually stopping to peak during October and November and ending on November 30th but you can still get tropical cyclones in the December but it's extremely rare.
Explanation:
This is because the waters are most warm as during August and September making the environment favorable for tropical development
why is velocity a vector quantity
Answer:
velocity is called vector quantity because it has both magnitude and direction.
A 40 kg girl is pushing a 40 kg boy in a 20 kg toy wagon. The wagon is moving at a constant speed of 2.0 m/s. Calculate the combined kinetic energy of the boyWhat is the acceleration of a 50 kg object pushed with a force of 500 newtons?
Answer:
Combined kinetic energy =120 joules
Acceleration= [tex]10 m/s^2[/tex]
Explanation:
Given that the mass of the girl= 40 kg.
The mass of the boy= 40 kg.
The mass of the wagon = 20 kg.
The combined velocity of the boy and the wagon, v= 2.0 m/s.
The kinetic energy of any object having mass m and moving with the speed of v m/s, is
K.E.= [tex]\frac 1 2 mv^2[/tex].
Here, the combined mass of the boy and the wagon = 40 + 20 = 60 kg.
So, the combined kinetic energy of the boy and the wagon
[tex]=\frac 12 60 \times 2^2= 120[/tex] J
When a force is applied on the object having the mass m, then
F=ma,
where a is the acceleration produced in the object.
Here, F=500 newtons and m= 50 kg.
so, [tex]500=50\times a[/tex]
[tex]\Rightarrow a = 500/50=10 m/s^2[/tex].
Hence, the combined energy is 120 joules and the acceleration is 10 [tex]m/s^2[/tex].
what do we call a solar power plant that uses mirrors to focus the light of the sun on a central point
Answer:
Concentrating solar power (CSP) plants use mirrors to concentrate the sun's energy to drive traditional steam turbines or engines that create electricity.
Explanation: