A steel railroad track has a length of 40 m when the temperature is −5 ◦C. What is the increase in the length of the rail on a hot day when the temperature is 35 ◦C? The linear expansion coefficient of steel is 11 × 10−6 ( ◦C)−1 . Answer in units of m.

Answer:

Energy lost due to friction is 22 J      

Explanation:

Mass of the ball m = 4 kg

Initially velocity of ball v = 6 m/sec

So kinetic energy of the ball [tex]KE=\frac{1}{2}mv^2[/tex]

[tex]KE=\frac{1}{2}\times 4\times 6^2=72J[/tex]

Now due to friction velocity decreases to 5 m/sec

Kinetic energy become

[tex]KE=\frac{1}{2}\times 4\times 5^2=50J[/tex]

Therefore energy lost due to friction = 72 -50 = 22 J

Final answer:

The energy lost due to friction as a 4 kg bowling ball slows down from 6 m/s to 5 m/s is 22 Joules. This is calculated using the difference between the initial and final kinetic energies.

Explanation:

The subject of this question is Physics, and it pertains to the High School level. The student is looking to understand the energy lost due to friction as a 4 kg bowling ball slows down from 6 m/s to 5 m/s. To calculate the energy lost, we use the kinetic energy formula:
Kinetic Energy (KE) = 1/2 m v^2

We calculate the initial and final kinetic energies and find the difference:

The energy lost due to friction is the difference between the initial and final kinetic energies:

Answer:

You put the rock in a graduated cylinder and measure how many milliliters it goes up.

Explanation:

Answer:

yes

Explanation:

Answer:

with what

Explanation:

Answer:

176ft/s

Explanation:

Speed of a wave is a function of the frequency and wavelength of the wave. It is expressed mathematically as:

V = fλ where:

V is the speed of the wave

f is the frequency

λ is the wavelength

Given f = 16Hz, λ = 11ft

V = 16×11

V = 176ft/s

Answer:

A: In an observer's reference frame, motion lacking uniform velocity includes motion at constant or variable speed in a circle; and motion of a reciprocating device. Supposing the zero refers to the “uniform velocity” rather than the motion removes the possibility of an object at rest.

Explanation:

Answer:

approx 2.23 seconds

Explanation:

150/67

s=d/t and t=d/s

Answer:

the amount of time covered by water or C  

Answer:

the amount of time covered by water

Explanation:

I just finished the quiz on ED

Answer:

-1.67 m/s

Explanation:

We can solve this problem by using the law of conservation of momentum: in fact, since the system is isolated (no external forces, since the ice is frictionless), the total momentum of Evelyin and Lily must be conserved.

The total momentum before is zero, since they are both at rest:

[tex]p_i = 0[/tex]

The total momentum after is:

[tex]p_f = mv+MV[/tex]

where

m = 48.3 kg is Lily's mass

M = 57.4 kg is Evelyin's mass

V = 1.4 m/s is Evelyn's velocity

v is the Lily's velocity

Since momentum is conserved,

[tex]p_i=p_f[/tex]

And so

[tex]0=mv+MV[/tex]

Solving for v, we find Lily's velocity:

[tex]v=-\frac{MV}{m}=-\frac{(57.4)(1.4)}{48.3}=-1.67 m/s[/tex]

And the negative sign indicates that her direction is opposite to Evelyn's direction.

Answer:

3 m/s^2

Explanation:

acceleration= Change in velocity/time

= 30-0 / 10

= 30/10

=3 m/s^2

Answer:

The amount of caffeine left after one half life of 5 hours is 15 oz.

Explanation:

Half life is the time taken for a radioactive substance to degenerate or decay to half of its original size.

The half life of caffeine is 5 hours. So ingesting a 30 oz, this would be reduced to half of its size after the first 5 hours.

So that:

After one half life of 5 hours, the value of caffeine that would be left is;

                                    [tex]\frac{30}{2}[/tex] = 15 oz

The amount of caffeine left after one half life of 5 hours is 15 oz.

Answer:

Okay let say from the diagram you have more force come in from the B point of the magnet and release out from A point of the magnet. so lets say north is always the attractive spot and south is your releasing spot.

Explanation:

meaning from magnet the north pole attracts objects and the south pole repeal object.

Answer:

Explanation:

Given that,

Weight of jet

W = 2.25 × 10^6 N

It is at rest on the run way.

Two rear wheels are 16m behind the front wheel

Center of gravity of plane 10.6m behind the front wheel

A. Normal force entered on the ground by front wheel.

Taking moment about the the about the real wheel.

Check attachment for better understanding

So,

Clock wise moment = anti-clockwise moment

W × 5.4 = N × 16

2.25 × 10^6 × 5.4 = 16•N

N = 2.25 × 10^6 × 5.4 / 16

N = 7.594 × 10^5 N

B. Normal force on each of the rear two wheels.

Using the second principle of equilibrium body.

Let the rear wheel normal be Nr and note, the are two real wheels, then, there will be two normal forces

ΣFy = 0

Nr + Nr + N — W = 0

2•Nr = W—N

2•Nr = 2.25 × 10^6 — 7.594 × 10^5

2•Nr = 1.491 × 10^6

Nr = 1.491 × 10^6 / 2

Nr = 7.453 × 10^5 N

Final answer:

The normal force exerted by the ground on the front wheel is 3.42 x 10^6 N. The normal force exerted by the ground on each of the two rear wheels is 4.02 x 10^5 N.

Explanation:

To determine the normal force exerted by the ground on the front wheel, we need to consider the torque balance. The torque exerted by the weight of the aircraft is equal to the torque exerted by the normal force. Since the weight acts at the center of gravity and the normal force acts at the front wheel, the torque equation becomes: (2.25 x 10^6 N)(10.6 m) = N(front wheel)(16.0 m). Solving for N(front wheel), we find that it is 3.42 x 10^6 N.

To determine the normal force exerted by the ground on each of the two rear wheels, we can use the fact that the sum of all the vertical forces should be equal to the weight of the aircraft. So, N(front wheel) + 2N(rear wheels) = 2.25 x 10^6 N. Substituting the value of N(front wheel) we found earlier, we can solve for N(rear wheels), which is 4.02 x 10^5 N for each rear wheel.

Answer:

Explanation:

Answer:

There is an increase in volume of the container, because it is a flexible container and he no fixed volume.

Explanation:

Because of the application of temperature , the molecules tends to expand and will try to free up.

Because the container the fas is inside is flexible, it will amount to increase in volume.

V1/T1= V2/T2

Showing the connection between volume and temperature.

Answer:

5,760,000 lb-ft²/s²

Explanation:

Work done, W = mgy where m = mass of stone = 12,000 lb, g = 32 ft/s² and y = vertical distance = 15 ft.

So, W = mgy = 12,000 lb × 32 ft/s² × 15 ft. = 5,760,000 lb-ft²/s²

Answer:

V=18 m/s

Explanation:

Impulse is represented by Δp. It can be expanded such as: Δp = m(v-u) , where m is mass, v is final velocity, and u is initial velocity. (sorry ib physics things)

You can substitute your given values into the equation.

Δp = -2000 (i kept this as negative since it is going the opposite direction to your initial velocity)

m = 1000 kg

u = 20 m/s

1.  -2000 = 1000(v-20)  --> -2000/1000

2.   -2 = v-20 --> -2 + 20

3.  v = 18 m/s

You can always double check your answer by substituting it back into the original equation to make sure the Δp = -2000

Answer:

180 watt

Explanation:

P = V x I

= 1.5 x 120

= 180 Watt

Answer:

The electrostatic force between two objects depends on two factors.

The first factor is the charge, if the charge of the two objects is large then the magnitude of the electrostatic force between them will also be large.

The second factor is the distance, if the distance between the charge is less the magnitude of electrostatic force will be large vice versa.

We can say that the electrostatic force is directly proportional to charge and inversely proportional to the separation between the charge.

Answer:

Explanation:

Heating a substance causes molecules to speed up and spread slightly further apart, occupying a larger volume that results in a decrease in density. ... Hot water is less dense and will float on room-temperature water. Cold water is more dense and will sink in room-temperature water.

Answer:

The sphere is positively charged

Explanation:

This is because when the positively charged rod is brought near the metal rod A, the electrons in metal rod A and sphere B are attracted towards it into metal rod A while the positive charges in the are repelled into sphere B. So, when the charged rod is withdrawn, and metal rod A and sphere B are separated, metal rod A is now negatively charged, but sphere B is positively charged.

So, sphere B is positively charged.

Final answer:

After the process of charging by induction and separation while a positively charged rod is nearby, sphere B ends up being positively charged due to a deficit of electrons.

Explanation:

The question revolves around the concept of charging by induction, a fundamental concept in electrostatics within physics. In this situation, a metal rod A and a metal sphere B, both initially neutral and on insulating stands, are in contact. A positively charged rod is brought near rod A, causing electrons in the metal rod and sphere to be attracted towards the end closest to the charged rod. This leaves the portion of rod A farthest from the charged rod, and sphere B, positively charged due to the deficit of electrons.

When A and B are separated while the charged rod is still nearby, this separation of charges is maintained: rod A will retain a surplus of electrons (negatively charged) near the side of the positively charged rod, and sphere B will be left positively charged due to a deficit of electrons. Once the positively charged rod is removed, both objects retain their induction-caused charges. Therefore, sphere B ends up being positively charged.

Answer:

A,B,E

Explanation:

Magnetic fields are produced by moving electric charges.

Electromagnet is a temporary magnet. It is made by winding wire around an iron core. As current flows in the coil the iron becomes a magnet, and when the current is turned off it looses it's magnetic properties.

Magnetic fields are produced by moving electric charges.

Everything around us is made up of atoms, and each atom has a nucleus made of neutrons and protons with electrons that orbit around the nucleus. The orbiting electrons are tiny moving charges. A small magnetic field is created around each atom.

Magnetic fields produced from charges, similarly to electric fields, but are different in that the charges must be moving.

Long straight wire carrying a current is the example of a moving charge that generates a magnetic field.

Therefore,

Moving electric charges produced magnetic field.

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Answer:

OPTION A, Kelvin Thermometer is Incorrect

Explanation:

Now, if you consider best two out of three results, then celsius and Fahrenheit thermometers read the same value, meaning both are right.

1) K = °C + 273

K = 100°C + 273

k = 373°C

Kelvin Thermometer is Incorrect

2) [tex]C = \frac{F - 32}{1.8}[/tex]

when we have 212°F

[tex]C = \frac{212 - 32}{1.8} \\\\= 100^\circ C[/tex]

which is correct

Answer:

Energy is transferred from the Sun to the Earth through radiation. As water is heated by the sun, it evaporates. The water vapor then condenses and forms clouds in the atmosphere.

Explanation:

When the Sun's energy moves through space, it reaches Earth's atmosphere and finally the surface. This radiant solar energy warms the atmosphere and becomes heat energy. This heat energy is transferred throughout the planet's systems in three ways: by radiation, conduction, and convection.

The energy transferred from the sun to the earth in the form of electromagnetic radiation. This radiant energy warms earth.

Radiation can be described as the energy that moves from one place to another in a form that can be defined as waves or particles.

There is a wide range of electromagnetic radiation from which visible light is one example.

Radiation with the highest energy like ultraviolet radiation, X-rays, and gamma rays. X-rays and gamma rays exhibit a lot of energy.

When radiations interact with atoms, they remove electrons and cause the atom to become ionized. Radiation can be transferred heat energy through space by electromagnetic radiation.

Most of the radiations that comes to the earth from the sun are invisible. Only a small part comes as visible light because light is composed of waves of different frequencies. Therefore, electromagnetic radiations coming from the sun warm the earth.

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Electromagnetic waves can travel through matter and a vacuum, and carry energy via their electric and magnetic fields. Meanwhile, ocean waves are mechanical, requiring water to move and don't carry energy in the same way. This fundamental difference in propagation and energy transfer sets the two apart.

Electromagnetic waves and ocean waves differ significantly in their nature and behavior. Electromagnetic waves are disturbances in the electric and magnetic fields and do not require a medium to propagate. They can travel through both matter and a vacuum, such as outer space, and all electromagnetic waves move at the same speed in empty space. This makes them different from other waves, such as sound and water waves, which are mechanical and require a medium (like air or water) to travel through.

On the other hand, ocean waves are mechanical waves that require water to move. These can be modeled using sine or cosine functions, depending on their wavelength, amplitude, and frequency. Unlike electromagnetic waves, ocean waves cannot move through a vacuum or empty space.

Another key difference is in the way electromagnetic waves bring energy into a system due to their electric and magnetic fields. These fields can exert forces and move charges in the system and thus do work on them.

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Electromagnetic waves are produced by the vibration of charged particles, can travel through a vacuum, and always travel at the speed of light. Unlike them, ocean waves require a medium to travel and their properties are influenced by environmental factors.

Differences Between Electromagnetic Waves and Ocean Waves

Electromagnetic waves differ from ocean waves in several fundamental ways. While both are forms of energy propagation, electromagnetic waves are produced by the vibration of charged particles and do not require a medium, meaning they can travel through the vacuum of space. In contrast, ocean waves are mechanical waves that require a medium, such as water, to travel. Electromagnetic waves have both electric and magnetic components and travel at the speed of light, which is a constant 300 million meters per second, regardless of their frequency or wavelength.

Another key difference is in how the waves carry energy. Longer electromagnetic waves, like radio waves, carry less energy and have lower frequencies, while shorter waves, like gamma rays, carry more energy and have higher frequencies. Ocean waves, on the other hand, have their energy and properties determined by factors such as wind, the gravitational pull of the moon, and the Earth's topography.

Answer:

A wave is defined as the disturbance of some property of a medium, be it the density, the pressure, or the electric field, propagating through space and thus transporting energy. An application of waves in medicine is ultrasound examinations. These images are taken in real time, showing the structure and the

movement of the internal organs, as well as the blood that goes through the blood vessels.

In entertainment, a common application of the waves is civil radio communication. This consists of the transmission of the signals of a certain type of electromagnetic waves. When they are modulated, the frequency or amplitude is modified and in this way the information is transmitted, from the emitter to the receivers. Then they transform into electrical impulses and then into audible sounds.

Explanation:

A specific example of a practical application of waves in medicine is the capturing of the body structures to detect abnormalities in them.

The ultrasound machine is a device that generates high-frequency sound waves that are reflected off body structures. For example, to detect an abnormality like kidney stones, an ultrasound machine can be used to capture the kidney.

This image will be examined by a medical examiner who analyzes the nature of the stones.

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Answer:

140°

Explanation:

The law of reflection states that the angle of redlection equals to the angle of incidence.

When light rays hit surface at 20°, they also leave the surface at the same angle

Since the whole surface has 180° then subtracting these two angles from total angle gives the the angle between the incident and reflected rays.

180°-20°-20°=140°

The angle of incidence and reflection are equal hence 140/2=70°

The question needed the angle between the incident and reflected rays which is already calculated as 140°

The reaction quotient (Q) is used to determine whether a system is at equilibrium by comparing it to the equilibrium constant (K).

The reaction quotient (Q) is used to determine whether a system is at equilibrium by comparing it to the equilibrium constant (K).

Here's how the reaction quotient is used to assess the system's status:

1. If Q = K, the system is at equilibrium. This means that the concentrations of the reactants and products in the system are such that the forward and reverse reactions occur at the same rate.

2. If Q < K, the system is not at equilibrium and will shift to the right to reach equilibrium. This indicates that the concentrations of the products are lower than what is required for equilibrium, so the forward reaction will be favored.

3. If Q > K, the system is not at equilibrium and will shift to the left to reach equilibrium. This suggests that the concentrations of the products are higher than what is needed for equilibrium, so the reverse reaction will be favored.

By comparing the reaction quotient (Q) to the equilibrium constant (K), we can determine whether a system is at equilibrium, and if not, in which direction the reaction will proceed to establish equilibrium.

Answer:

The answer is V =delta U over q

Explanation:

Electric potential is defined as the magnitude of the electric field through the potential energy that a charge would have if placed at that point. Mathematically, the potential is defined with the following expression:

[tex]V=\frac{E_{p} }{q}[/tex]

where:

V is the electric potential. Its unit is Julius by Coulomb (J/C).

Ep is the electric potential energy that has a charge

q is the charge

In the question Ep = ΔU

Answer:

The answer is V=kq/d

Explanation:

The electrostatic potential is defined in terms of work done in taking a unit positive charge from infinity to the point in question.

V=kq/d

Where d= distance from infinity to the point in question

k= constant of proportionality

q= attracting charge

The electric potential is measured in volts

Answer: The kinetic energy in physics can be defined as the energy possessed by the body when it is in motion relatively to the other bodies. This energy depends on the mass of the body and the square of the velocity. Its measurable unit is in Joules.

Answer and Explanation:

Given data:

The electric field is

E

=

1000

N

/

C

The initial kinetic energy of the ejected electrons is

k

=

3

e

V

=

(

3

×

1.6

×

10

−

19

)

J

The expression for the conservation of energy of the electrons is given by

k

=

U

p

k

=

e

V

Here

U

p

=

e

V

is the potential energy of the electron

Here

V

=

E

d

is the electric potential in electric field

Here

e

=

1.6

×

10

−

19

C

is the charge of the electon

Substituting the values in the above equation as,

k

=

q

V

k

=

e

(

E

d

)

(

3

×

1.6

×

10

−

19

J

)

=

(

1.6

×

10

−

19

C

)

(

1000

N

/

C

)

×

d

d

=

0.003

m

d

=

3

m

m

Explanation:

Answer:

Continuously changing magnetic field of the Sun

Explanation:

The Sun is made up of plasma and is not solid like our planet. When it rotates the whole of the Sun doesn't rotate with same speed. The equatorial part completes the rotation in just 25 days whereas the poles do it in 35 days. Due to this the magnetic field lines entangle and reorganize them regularly.

The places where the field line exit and enter the surface of the Sun, temperature drops by around 1000 K thus these spots appear black in color and are known as Sun spots.

The magnetic field is not permanent as it will keep changing due to differential rotation. This will result in the change in the no. of location of Sun spots.

If we track the no. of sunspots visible with respect to years we will notice that they follow a cycle of 10.6 years. This is known as Solar cycle in which there comes a solar minima when we see very few sunspots. When it is solar maxima we can see more than 100 sunspots.