A steel railroad track has a length of 25 m
when the temperature is 0°C.
What is the increase in the length of the
rail on a hot day when the temperature is
30°C? The linear expansion coefficient of
steel is 11 x 10-6 (°C) -¹
Answer in units of m

The mass of the rock with a kinetic energy of 113J and a speed of 6.2m/s is approximately 5.88 kilograms.

Kinetic energy is simply the energy a body possesses due to its motion;

It is expressed as;

K.E = 1/2 × m × v²

Given the data in the question;

To determine the mass of the rock, plug the given values into the Kinetic energy formular and solve for m.

K.E = 1/2 × m × v²

113kgm²/s² = 1/2 × m × ( 6.2m/s )²

113kgm²/s² = 1/2 × m × 38.44m²/s²

113kgm²/s² = m × 19.22m²/s²

m = 113kgm²/s² / 19.22m²/s²

m = 5.88kg

Therefore, the mass of the rock is 5.88 kilograms.

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Answer: some may argue that while teacher’s only provide service to a single classroom, superstar athletes are entertaining fans all around the world, enticing people with a feeling of relaxation and excitement. Obviously, what these individuals must not be aware of is the most important man in our nation, the president, who makes critical decisions that affect the entire world every day, only makes $400,000 a year. While President Obama is hard at work reviving the economy, the unproven rookie in the MLB is earning way over that figure. Furthermore, police officers, firefighters, and doctors save lives while risking their own for a fraction of what sports stars make. People in the military leave their families at home to defend and protect the country knowing they may never return. It's truly a pity that none of these true heroes are given the same recognition by society as athletes such as Brett Favre or Michael Jordan are given. While I do understand that making it into the pros is not an easy thing to do, and that it takes a tremendous number of hours of hard work and dedication every day to earn a job in professional sports, these people do nothing more than entertain the general public.

Explanation:

Answer:

Wouldn't it be great to make nearly $111 million a year simply to play a game? Tiger Woods, along with many other professional athletes, certainly think so. But do these athletes really deserve all that money?

In my mind, absolutely not. Professional athletes are making too much money in a society where salaries and wages are traditionally based on the value of one's work. In today's society, one should be paid according to the job’s economic importance and their value to society.

Teaching is one of the most economically important occupations because our future economy relies on the education of its youth, yet teachers are paid astronomically less than the average professional athlete is. In fact, each basket Kobe Bryant scores earns him equivalent to the average classroom teacher’s yearly salary.

However, some may argue that while teacher’s only provide service to a single classroom, superstar athletes are entertaining fans all around the world, enticing people with a feeling of relaxation and excitement.

Obviously, what these individuals must not be aware of is the most important man in our nation, the president, who makes critical decisions that affect the entire world every day, only makes $400,000 a year. While President Obama is hard at work reviving the economy, the unproven rookie in the MLB is earning way over that figure.

Furthermore, police officers, firefighters, and doctors save lives while risking their own for a fraction of what sports stars make. People in the military leave their families at home to defend and protect the country knowing they may never return. It's truly a pity that none of these true heroes are given the same recognition by society as athletes such as Brett Favre or Michael Jordan are given.

While I do understand that making it into the pros is not an easy thing to do, and that it takes a tremendous number of hours of hard work and dedication every day to earn a job in professional sports, these people do nothing more than entertain the general public.

Moreover, in my mind, if these athletes want to continue to be rewarded with the fame and fortune that is unfairly bestowed upon them, they must prove to the world that they are going to be positive role models for future athletes, and those who admire them.

Explanation:

found if off some website lol hope it helps! <3

The overall charge of an object that has 82 protons, 82 neutrons, and 109 electrons is -27. Details about charge can be found below.

The overall charge of an atom can be calculated by subtracting the number of electrons from the number of protons.

The proton number represents the number of positively charged atom while the electron number represents the number of negatively charged atom.

According to this question, a charged object has 82 protons, 82 neutrons, and 109 electrons. The overall charge of the atom is calculated as follows:

Overall charge = 82 - 109

Charge = -27

Therefore, the overall charge of an object that has 82 protons, 82 neutrons, and 109 electrons is -27.

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Answer:

7.65 T

Explanation:

From the question,

Using,

F = BILsinФ......................... Equation 1

Where F = Force, B = magnetic field strength, I = current, L = Length, Ф = Angle.

Make B the subject of the equation

B = F/ILsinФ........................Equation 2

Given: F = 2.55 N, I = 32 A, L = 3.00 cm = 0.03 m, Ф = 90° (perpendicular)

Substitute into equation 2

B = 2.55/(32×0.03×sin90°)

B = 2.55/0.96

B = 7.65 T

The force needed to push the ice block down so it is just submerged in water is 19.6 N, which is equal to the weight of the ice block.

When an object is floating in a fluid, it displaces a volume of fluid equal to its volume. In this case, the ice block has a density of 917 kg/m³, which is less than the density of water (1000 kg/m³). Since the ice block is floating, it displaces its weight in water, which is equal to the force required to submerge it.

The weight of the ice block can be calculated using its mass (2 kg) and the acceleration due to gravity (9.8 m/s²). The weight is given by the equation weight = mass × gravity, which gives us weight = 2 kg × 9.8 m/s² = 19.6 N.

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The equation for pendulum motion is T = 2π√(l/g), where T represents the period of oscillation, l represents the length of the pendulum, and g represents the acceleration due to gravity.

A pendulum is a simple device consisting of a mass (known as the bob) suspended from a fixed point by a string or rod. When the bob is displaced from its resting position, it swings back and forth in a repetitive motion known as oscillation.

The period of oscillation (T) of a pendulum depends on its length (l) and the acceleration due to gravity (g). The longer the pendulum, the longer the period, and the greater the acceleration due to gravity, the shorter the period.

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U₂ = 0 V. The lamp (L₂) is short circuited, meaning that there is no resistance between its terminals. As such, the voltage across its terminals must be zero.

Resistance is a concept in physics that measures the opposition to the flow of electric current, heat, light, sound, or any other form of energy or matter. It is the measure of how much an object, material, or system resists the flow of electric current, heat, light, sound, or any other form of energy or matter.

a) U₂ = 0 V. The lamp (L₂) is short circuited, meaning that there is no resistance between its terminals. As such, the voltage across its terminals must be zero.

b) U₁ = 12 V. Since the generator is providing a constant voltage of 24 V across its terminals, the voltage across the terminals of (L₁) will be half of this, i.e. 12 V. As the lamps are identical, the current I' through the circuit will also be 0.6 A.

c) (L₁) may burn out due to the large amount of current it is carrying. If the current is too high, it may exceed the rated capacity of the lamp and lead to its failure.

d) (L₁) does not burn out because the circuit includes a fuse. The fuse is designed to break the circuit in the event of an excessive current, thus protecting the lamp from burning out. When the fuse blows, the circuit is broken and the lamp will be off.

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Answer:

20mA

Explanation:

because it is connected in series with the ammeter

The current through the 40Ω resistor in the given circuit is 20mA, which is explained below.

The volate across resistor R is 1V, as indicated by the voltmeter.

Since the potential of the battery is 3V, according to Kirchoff's voltage law, the voltage drop across 20Ω resistors must be 1V each since they are indentical.

Let a total current I passes through 20Ω resistor as it is connected to the battery in series. From Ohm's law:

20Ω × I = 1V

I = 50mA

Now the current indicated by the ammeter is 20mA which splits according to the reistors of 15Ω and 30Ω which are connected in parallel. Then again the current adds up to 20mA when leaving the set of parallel resistors, through the 40Ω resistor.

So the current through the 40Ω resistor is 20mA

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Gravity is a fundamental, universal force that pulls objects toward Earth's center. It increases with mass and decreases with distance. Measured in Newtons, it affects all objects.

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The correct question would be as

Which statement describes gravity? Select three options. There is no defined unit of measurement for gravity.

Gravity is the force that pulls objects toward Earth’s center.

Objects that have a small mass will have no gravitational pull.

Gravitational pull between two objects increases as the mass of one increases.

Gravitational pull decreases when the distance between two objects increases

Answer:

The answer is "36 grams".

Explanation:

In this question, the weight of the ball is not mentioned but is the weight of the cookies is declared, which is equal to 36 grams, and all the cookies are squeezes into the ball and after that, it calculates the overall weight so, let assume that ball weight is =0 and then the overall weight is:

\(=\text{weight of ball + cookies weight}\\\\=0+36 \ grams \\\\=36 \ grams\)

The values of all sub-parts have been obtained.

(1).  The maximum factored load the beam can withstand is 45.2 kN/m.

(2).  The moment resistance of the cross-section is 291735.65 Nm.

(3).  The factored moment demand is 27939.6 Nm

1) To draw the governing shear and bending moment diagram for the factored load, we need to first calculate the maximum factored load that the beam can withstand.

The maximum factored load on the beam is given by:

Dead Load = 20 kN/m + 15 kN

                   = 35 kN/m.

Live Load = 2 kN/m + 1 kN

                = 3 kN/m.

Total Factored Load = 1.2 x Dead Load + 1.6 x Live Load

                                  = 1.2 x 35 kN/m + 1.6 x 3 kN/m

                                  = 45.2 kN/m.

The maximum factored load the beam can withstand is 45.2 kN/m.

The shear force and bending moment diagrams for the given factored load can be obtained as shown below:

Shear Force Diagram:

Bending Moment Diagram:

2) To calculate the moment resistance of the cross-section, we can use the formula:

MR = σst A'(d - a/2) + 0.85f'c A''(d - a/2)

Where, σst = yield stress of tension steel [σst = fy / γst],

γst = safety factor for tension steel [γst = 1.15A']

A' = area of tension steel, [A'' = b(d - a)].

Where,

b = width of the beam [b = 600 mm],  

d = total height of the beam [d= 1000 mm],

a = effective depth of tension steel [a = 920 mm]

f'c = compressive strength of concrete [f'c = 25 MPa],

MR = σst A'(d - a/2) + 0.85f'c A''(d - a/2)

MR = (400 / 1.15) x 10 x (1000 - 920/2) + 0.85 x 25 x 590 x (1000 - 920/2)

MR = 291735.65 Nm

The moment resistance of the cross-section is 291735.65 Nm.

3) To check if this cross-section is adequately designed to resist the factored bending moment (LRFD), we need to calculate the factored moment demand and compare it with the moment resistance.

The factored moment demand is given by:

MF = ϕ x Mu

Where,ϕ = resistance factor = 0.9, Mu = factored bending moment

Mu = 1.2 x Dead Load x L2 / 8 + 1.6 x Live Load x L2 / 8 + 1.2 x (Dead Load + Live Load) x L2 / 2

   = 1.2 x 35 x 152 / 8 + 1.6 x 3 x 152 / 8 + 1.2 x 38 x 152 / 2

   = 31044 Nm

MF = ϕ x Mu

     = 0.9 x 31044

    = 27939.6 Nm

The factored moment demand is 27939.6 Nm, which is less than the moment resistance of the cross-section, i.e., 291735.65 Nm.

Therefore, this cross-section is adequately designed to resist the factored bending moment.

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Answer:

See below

Explanation:

If the cookie is irregular, it will have no fixed number as a radius----depending on where you measure from the center to the circumference, it could be one of several values---

  You COULD measure the circumference then perhaps the average diameter could be calculated as:   circumference/ pi = diameter

  then radius = 1/2 diameter

I think your teacher is saying the cookie is IRREGULAR in VOLUME (or thickness)  but not in SHAPE

 so you could use the method I mentioned above ....or you could use the AREA of the cookie ( rather than the VOLUME)

  AREA = pi r^2     then radius would be =  √ ( area / pi)

Answer:

I believe the answer is 16.404.

Explanation:

I used a calculator.

the impulse J imparted to sphere B by sphere C is:

J = mB*Δv

J = mB*[VBo - (mBVBi + 2mCVCi - mCVCo) / (mB + mC)]

To find the impulse J imparted to sphere B by sphere C, we need to know the change in momentum of sphere B due to the collision with sphere C. The impulse J is defined as:

J = Δp = mΔv

where Δp is the change in momentum, m is the mass of sphere B, and Δv is the change in velocity of sphere B.

Since we know that the collision is elastic, we can use the conservation of momentum and energy principles:

\(mBVBi + mCVCi = mBVBo + mCVCo (1) --\)conservation of momentum

\(1/2mBVBi^2 + 1/2mCVCi^2 = 1/2mBVBo^2 + 1/2mCVCo^2 (2) --\)conservation of energy

where VB and VC are the velocities of sphere B and C before and after the collision, respectively, and the subscripts "i" and "o" refer to the initial and final states.

Solving equations (1) and (2) simultaneously for VB and VC, we get:

\(VB = (mBVBi + 2mCVCi - mCVCo) / (mB + mC) --\)final velocity of sphere B

\(VC = (mCVCo + 2mBVBi - mBVBo) / (mB + mC) --\)final velocity of sphere C

Therefore, the change in velocity of sphere B is:

\(Δv = VBo - VB\)

\(Δv = VBo - [(mBVBi + 2mCVCi - mCVCo) / (mB + mC)]\)

And the impulse J imparted to sphere B by sphere C is:

\(J = mB*Δv\)

\(J = mB*[VBo - (mBVBi + 2mCVCi - mCVCo) / (mB + mC)]\)

This is the magnitude of the impulse J imparted to sphere B by sphere C.

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Answer:

4 Ohms

Explanation:

Apply the formula:

Voltage = I (current) . Resistance

You can change it the way you want to use for your purpose.

In this case...

R = V/I

R = 12/3

R = 4 Ohms (Ohm is the unit of measurement of eletrical resistance)

Answer:

Let the mass of the book be "m", acceleration due to gravity be "g", velocity be "v" and height be "h".

Now if we are holding a book at a certain height (h), the potential energy will be maximum which is equal to mass× acceleration due to gravity× height (= mgh).

(Remember: kinetic energy =0)

Now we consider that the book is dropped, in this case a force will act downward towards the centre of the earth, Force= mass× acceleration due to gravity (F=mg). It is equal to the weight of the book.

While the book is falling, the potential energy stored in the book converts into kinetic energy and strikes the floor with the maximum kinetic energy= (1/2)×mass×velocity² (=1/2mv²).

(Remember: kinetic energy=0)

Due to this process the whole energy is conserved.

As the potential energy decreases kinetic energy increases.

Change in potential energy of the proton= (1.6 × 10^-19 C) × (400 V)

To calculate the change in potential energy of the proton, we need to use the formula:

The change in potential energy of a proton can be described as the difference in its stored energy when transitioning from one position to another within an electric field. Potential energy is directly related to the distance between charged particles.

As the proton moves closer to a positively charged object or further away from a negatively charged object, its potential energy increases. Conversely, if the proton moves away from a positively charged object or closer to a negatively charged object, its potential energy decreases.

This change in potential energy is a result of the electric force acting on the proton, with the magnitude of the change depending on the distance and the strength of the electric field.

Change in potential energy = Charge of the proton (q) × Potential difference (V)

The charge of a proton is 1.6 × 10^-19 C (Coulombs), and the potential difference is given as 400 V.

Change in potential energy = (1.6 × 10^-19 C) × (400 V)

By multiplying these values, we can find the change in potential energy.

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Answer:

a

Explanation:

There is no acceleration horizontally (since we are ignoring air friction) ....after the ball is fired it will maintain a constant 50 m/s horizontal velocity

It WILL experience a VERTICAL acceleration due to gravity ( 9.81 m/s^2)

Answer:

he found that a single forece known as gravity keeps the planets in their orbits around the sun gravity force that keeps planets in their orbits calculus a branch of mathmatics partially developed by Newton and used to explain his laws

Explanation:

I hope you have a nice day and please mark me(:

Radial component of the linear acceleration = 99.47 m/s^2

The diameter of the wheel, d = 51 cm

The radius, r = d/2 = 51/2 = 25.5 cm

r = 25.5/100 = 0.255 m

r = 0.255 m

At t = 1.1, first calculate the new angular velocity

The radial component of the linear acceleration is given as:

Answer:

1.A

2.E

3.C

4.i think A

Explanation:

Question:

1) A tourist accidentally drops a camera from a 50.0 m high bridge. What is the speed of the camera as it hits the water? *

Answer:

28.0 m/s

Based on my notes the answer must be B. horizontal layers

Answer:

B. horizontal layers

Explanation:

Answer:

v =2.02

Explanation:

v^2=0.05-4.9

v^2=-4.85

square root both side

v=2.02

^^^^this is a not a perfect square  

The time it takes for a message sent from Earth to reach a rover on Mars varies depending on the distance between the two planets and their positions in relation to one another.

However, typically, it takes between 4 and 24 minutes for a message to travel from Earth to a rover on Mars and vice versa.

The distance between the two planets varies depending on their positions in their respective orbits around the sun. When Mars is on the opposite side of the sun from Earth, it is at its farthest distance from Earth, which can make it more difficult for signals to travel through space. At this point, the distance between the two planets can be as much as 401 million kilometers (249 million miles).

At its closest approach to Earth, Mars can be as near as 56 million kilometers (35 million miles) from us. However, it is still a long way off, and it takes time for signals to travel between the two planets.

Mars rovers have been essential to our exploration of Mars. They provide us with valuable information about the planet's geology, weather, and atmosphere, as well as its potential habitability for humans. Mars rovers have also been used to search for evidence of water and possible signs of past or present microbial life.

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The amino acid tryptophan is essential for the control of the trp operon in bacteria. A set of genes known as the trp operon is in charge of creating the tryptophan biosynthesis enzymes.

An essential amino acid called tryptophan is crucial for a variety of bodily processes. It serves as a precursor for the manufacture of the neurotransmitters serotonin and melatonin, which are crucial for controlling mood, sleep, and hunger. The creation of new proteins depends on tryptophan, another essential component of proteins. Tryptophan has also been demonstrated to have immune-modulating characteristics, which may help prevent some cancers. Eggs, fish, chicken, nuts, and other foods all contain tryptophan, which is also available as a dietary supplement.

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Liquid containers are necessary to store liquids or other fluids, and are manufactured using various materials. These materials have unique properties and physical characteristics to meet the diverse requirements of different fluids and their storage conditions. Two of the materials used to make liquid containers are covalently bonded and metal.

1) Covalently bonded materials:Covalent bonds are strong bonds formed between atoms by sharing electrons. Covalently bonded materials are non-metallic materials that use a covalent bond between atoms to form the material. Examples of covalently bonded materials that can be used to manufacture liquid containers include:

- Polyethylene Terephthalate (PET): PET is a plastic material used to make water bottles and soft drink bottles. PET is lightweight and unbreakable, making it ideal for shipping and storing liquids.

- Polypropylene (PP): PP is a popular plastic material that is lightweight, durable, and resistant to chemical reactions. PP is used to make containers that store harsh chemicals and strong acids, as well as food containers, such as yogurt cups and margarine tubs.

In conclusion, there are many materials available that can be used to manufacture liquid containers, including covalently bonded materials and metals. The choice of material used depends on the type of liquid being stored and the storage conditions.

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The statement that describes what happens in the graph is option (B).

The lander's velocity decreases toward the reference.

Velocity time graph is a type of graph that describes the change in velocity with respect to time of motion of an object.

Below is the basic explanation of the behavior of the average velocity of the particle with time.

Thus, we can conclude that between 20 and 25 seconds in the velocity tike graph, the average velocity of the object decreased towards the reference point (reference velocity = - 40 m/s.).

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Answer:

1. The idea of discrete, indivisible particles within atoms.

2. Millikan's findings contributed to the development of the modern atomic theory.

3. The experiment measured the charge of an electron

Explanation:

Robert Millikan's well-known oil-drop experiment, carried out in 1909, had a fundamental impact on our knowledge of the atom. The first concrete experimental proof of an electron's existence was provided by this experiment, which measured the charge of an electron. By carefully measuring the motion of charged oil droplets, Millikan was able to determine the charge of the electrons by calculating their charge-to-mass ratio.

This ground-breaking effort contributed to the advancement of contemporary atomic theory and helped create the fundamental unit of electric charge. Critical understandings of the composition and characteristics of matter were gained through Millikan's discoveries, which supported the notion that atoms contained separate, indivisible components.

Answer:

A. it is Electromagnet

B. there are 2 ways to increase the magnetic field in this situation.

hence only by doing first way ( increase number of turns) magnetic field can be increased.