9. A net force of 25 N is applied for 5.7 s to a 12-kg box initially at rest. What is the speed of the box at the end of the 5.7-s interval?A) 1.8 m/sB) 12 m/sC) 3.0 m/sD) 7.5 m/sE) 30 m/s

Answer:

That relation is for force and mass and acceleration.

• For linear horizontal motion

\(f = m \times a\)

• for linear vertical motion

\(f = m \times g\)

g is 9.81 m/s²

The photon energy for a transition from n = 2 to n = 1 in a myonic atom with a mass of 140 AMU and a nuclear charge number Z = 60 is approximately X Joules.

To calculate the photon energy for the given transition, we can use the formula derived from the Bohr model of the atom. The energy of a photon emitted or absorbed during an electronic transition can be determined by the difference in energy levels of the initial and final states. The formula for the energy of a photon is given by:

E = hc / λ

Where E is the energy of the photon, h is Planck's constant (approximately 6.626 x 10^-34 J·s), c is the speed of light (approximately 3.00 x 10^8 m/s), and λ is the wavelength of the photon.

First, we need to find the initial and final energy levels of the transition. In the Bohr model, the energy levels of an electron in a hydrogen-like atom (an atom with one electron and Z protons in the nucleus) are given by:

En = -13.6 eV / (Z^2 / n^2)

Where En is the energy level, Z is the nuclear charge number, and n is the principal quantum number.

For the initial state, n = 2, and for the final state, n = 1. Plugging these values into the equation, we can calculate the energy levels:

E2 = -13.6 eV / (60^2 / 2^2)

  = -13.6 eV / (3600 / 4)

  = -13.6 eV / 900

  = -0.015 eV

E1 = -13.6 eV / (60^2 / 1^2)

  = -13.6 eV / (3600 / 1)

  = -13.6 eV / 3600

  = -0.00378 eV

Next, we need to calculate the difference in energy levels, ΔE:

ΔE = E2 - E1

   = -0.015 eV - (-0.00378 eV)

   = -0.01122 eV

Now, we can convert the energy difference to Joules:

1 eV = 1.6 x 10^-19 J

ΔE (J) = ΔE (eV) x (1.6 x 10^-19 J / 1 eV)

       = -0.01122 eV x (1.6 x 10^-19 J / 1 eV)

       ≈ X Joules

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The correct option would be option B. 8.20 seconds. The motion of the golf ball can be divided into two phases. They are; The time for the golf ball to reach the maximum height and the time for the golf ball to return to the ground. The time for the golf ball to reach the maximum height is half of the total hang time.

The given figure is shown below:

Given,

Initial velocity, u = 15 m/s (upward direction)

Final velocity, v = 0 m/s (at the maximum height)

Acceleration, a = g = 9.8 m/s² (downward direction)

Time taken to reach the maximum height, t = 3 seconds

The formula to find the height of the golf ball is given by;

h = ut + 1/2at²h = 15 x 3 + 1/2 x 9.8 x 3²h = 67.05 m

In the second phase, the golf ball falls from the maximum height to the ground. The time taken by the ball to reach the ground from the maximum height is the same as the time taken to reach the maximum height from the ground.The velocity of the golf ball while it hits the ground is the same as its initial velocity.

Hence, we can use the following formula to find the total hang time:

t = 2u/gt = 2 x 15 / 9.8t = 3.06 seconds

Therefore, the correct option is B. 8.20 seconds.

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Answer:

this much I think 101.9716212978

Answer:

approximately 102kg

Explanation:

1 kg on the surface of the Earth weighs 9.80665 N

1000 N = 1000/9.80665 kg = 102 kg

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The magnetic force on each side of the wire loop is 0.872 N, due to the interaction with the magnetic field.

To calculate the magnetic force on each side of the wire loop, we can use the formula F = I * L * B * sin(θ), where F is the magnetic force, I is the current, L is the length of the wire segment, B is the magnetic field strength, and θ is the angle between the wire and the magnetic field.

In this case, the current (I) is 6.7 A, the length of each side (L) is 11 cm (0.11 m), and the magnetic field strength (B) is 9.1 T. The angle (θ) between the wire and the magnetic field is 90 degrees, as the field is perpendicular to the hypotenuse.

Plugging in these values into the formula, we get F = 6.7 * 0.11 * 9.1 * sin(90°) = 0.872 N. Therefore, the magnitude of the resulting magnetic force on each side of the wire loop is 0.872 N.

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The orbital radius of the second satellite is 1.31r1.

What is the orbital radius ?

The average separation of a planet from the sun is known as orbital radius. Given that it has a significant impact on planetary temperature, this is one of the most crucial factors in evaluating a planet's ability to support life. The distance between a planet's center and surface is known as the planetary radius.

Time period of a satellite in circular orbit of radius 'r' is

\(T^2\alpha r^3\)

T= time period

\(T1^2/T2^2=r1^3/r2^3\\T2=1.5T1=3/2T1\)

\((T1/3/2T1)^2=(r1/r2)^3\\(2/3)^2=(r1/r2)^3\\- > 4/9=(r1/r2)^3\\r1=(4/9)^1/3r2\\r2=(9/4)^1/3r1\\r2=1.31r1\)

A planet has two satellites in circular orbits of the second satellites is 1.31r1.

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You calculate energy from frequency by using the formula E = h*v.

A light wave is an electromagnetic wave that carries energy and is produced by the periodic motion of the magnetic and electric fields.

The frequency of a wave is the number of waves that pass through a particular place in a given period of time.

The formula shown below can be used to get the energy of a wavelength given a frequency:

E = h*v,

where,

E is the energy of the light wave, measured in electron-volts (eV), h is Planck's constant, 6.6261034 Joule seconds, and v is frequency, measured in Hertz (Hz).

The amount of energy they carry is related to their frequency and their amplitude. The higher the frequency, the more energy, and the higher the amplitude, the more energy.

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In fact, it is the natural tendency of objects to resist changes in their state of motion. This tendency to resist changes in their state of motion is described as inertia. Inertia = the resistance an object has to a change in its state of motion.

A driver should maintain the same distance when following a motorcycle as they would when following a car.

When driving behind a motorcycle, it is essential for a driver to exercise caution and keep a safe distance, just as they would when following a car. Motorcycles are smaller in size, which can make them appear farther away than they actually are. It is crucial for drivers to remember that motorcycles can stop more quickly than cars due to their smaller size and better braking capabilities. By maintaining an adequate distance, drivers allow themselves enough time to react and brake in case of sudden stops or emergencies.

Moreover, motorcycles can be more vulnerable to external factors such as wind or obstacles on the road. To avoid creating hazardous conditions for the motorcycle rider, it is important for drivers to provide sufficient space. This ensures that the motorcycle has enough room to maneuver safely without the risk of losing control.

Regardless of the driver's level of experience, it is crucial to never assume that the motorcycle rider possesses the same level of expertise. By maintaining the same distance as when following a car, drivers demonstrate a responsible and cautious approach towards sharing the road with motorcycles.

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Answer:

39

Explanation:

calculator

Answer:

39 is the answer. of your questions

Answer:

A

Explanation:

Light has both wave and particle characteristics. It behaves as wave in examples such as Reflection, refraction, diffraction, interference. It behaves as a particle in photoelectric effect, compton's effect etc. Light is an example of wave-particle duality.

Light demonstrate both particle and wave characteristics. It can be understood by photo electric effect .

Light behaves like a particle in some phenomenon , for example photoelectric effect and like wave in some phenomenon , for example reflection and refraction , in this wave light has dual nature.

Emission of photo electrons due to incidence of light on a surface, is called photo electric effect. For it the energy of the incident light should be greater than the work function of the material on which light incidents.

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Answer:

inference

Explanation:

took the test hope I helped :p

The key to walking on fire without burning one's feet is the low thermal conductivity of ash and the short time the feet stay in contact with the hot coals.

Firewalking is a practice of walking on a bed of hot embers or coals that are usually from a wood fire. Most fire walkers practice this act for religious, spiritual, or cultural events.

The key factor that makes it possible for fire walkers to walk on hot embers without getting burned is the coals' low thermal conductivity. Thermal conductivity is the ability of a material to conduct heat. The lower the thermal conductivity, the less heat a material conducts.

Firewalkers usually walk on ash-covered embers that have been burning for several hours. Firewalkers walk across the embers quickly, taking short steps and keeping their weight on the balls of their feet.

This ensures that their feet are in contact with the hot coals for a minimal amount of time, making it possible to walk on fire without burning their feet.

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Answer:

because sound needs medium to transmit.

The sound is produced by vibration and if there is no medium there is no vibration and no vibration means no sound.

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Existing rocks come together under great heat and pressure to generate metamorphic rocks. Marble, schist, slate, and quartzite are examples of metamorphic rocks. Heat and pressure cause chemical changes in minerals, resulting in metamorphic rocks. They are frequently encountered near magma, but unlike igneous rock, they do not melt.

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The mass of earth became calculable when henry cavendish calculated the value of g the gravitational force between two objects on earth.

The gravitational force appealing as it usually tries to pull hundreds together, it in no way pushes them apart. sincerely, the gravitational force is at once proportional to the mass of each interacting item, greater large objects will appeal to each different with an extra gravitational force.

The force of enchantment on a frame with the aid of the earth is known as gravitational force. example: The leaves and fruits fall from a tree downwards in the direction of the ground, water in a river flows down streams, a ball thrown up is going to a peak and then returns back on the floor are a few examples of motion due to gravitational force.

Gravitation or just gravity is the pressure of appeal between any two of our bodies. all of the items in the universe entice every different with a positive quantity of force, but in most instances, the force is simply too weak to be located because of the very huge distance of separation.

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Answer: D- Each chromosome in a cell is made up of two chromatids, which are each made up of molecules of DNA

Explanation:

A macromolecule is a large molecule that is made of many smaller units. Chromosomes are macromolecules that contain all of the genetic information in a cell. Chromosomes are each made of two smaller units called chromatids. Chromatids are each made up of molecules of DNA. Therefore, the correct description of the hierarchy of genetic material in a cell is that each chromosome in a cell is made up of two chromatids, which are each made up of molecules of DNA. The structures become more and more microscopic as one moves down the hierarchy.

The skater's final angular speed is equal to 12 rad/s.

When implemented to angular momentum, the regulation of conservation means that the momentum of a rotating item is no longer exchanged until some form of external torque is carried out. Torque, in this sense, can check with any outside pressure that acts upon the object for the purpose to twist or rotate.

The law of conservation of angular momentum states that once no external torque acts on an item, no trade of angular momentum will occur. The angular momentum of a machine is conserved as long as there may be no net external torque performing on the machine.

In angular kinematics, the conservation of angular momentum refers back to the tendency of a device to keep its rotational momentum inside the absence of outside torque. For a round orbit, the system for angular momentum is (mass) ×(pace) ×(radius of the circle): (angular momentum) = m × v × r.

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2.85*10^(-9) N, gravitational force does each exert on the other and all masses in the cosmos are attracted to one another by the gravitational force . For instance, the mass of the earth pulls objects near its surface.

According to the Third Law of Motion, gravitational force  is a force exerted by one object on another instantaneously causes the second object to exert a force back on the first. Both of these forces have the same magnitude but always move in the opposite direction. These forces work on various objects, which prevents them from cancelling each other out.

Given m1=6kg , m2= 50g=0.05kg

   d= 0.14m

Gravitational force= Gm1m1/d^2

           =6.67*10^(-11)*(6)(0.05)/(0.14)^2

            = 5.6028*10^(-11)/(0.14)^2

            = 2.85*10^(-9) N

Here   F/mg= 2.85*10^-9/(0.05)(9.8)

                    = 5.58*10^(-9) N

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The electric field strength inside a spherical ball of charge is given by the equation;E(r) = Emax(r⁴/R⁴)Where Emax is the maximum electric field strength in the sphere.

The electric flux emanating from a point charge is directly proportional to the charge and inversely proportional to the square of the distance between the point charge and the point where the electric flux is calculated. Thus;E = Q/4πϵr²Where E is the electric field strength, Q is the charge, ϵ is the permittivity of free space and r is the distance between the point charge and the point where the electric field strength is calculated

.Since the electric field strength inside a spherical ball of charge is Emax at a distance of r = R, the maximum electric field strength, Emax, is given by;Emax = Q/4πϵR³2. inside the ball as a function of r is given by;ρ(r) = Q/V(r)Where V(r) is the volume of the spherical ball of radius r.Substituting for V(r);V(r) = 4/3πr³ρ(r) = Q/4/3πr³ρ(r) = 3Q/4πr³

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The heat absorbed by the water sample to convert it from 17.5°C to 118.9°C is approximately 539.24 kJ.

Heat absorbed refers to the amount of thermal energy that is added to a substance and causes an increase in its temperature. It is a measure of the energy transferred from a heat source to a substance. The heat absorbed can be calculated using the formula:

Q = mL

where Q is the heat absorbed, m is the mass of the substance, and L is its change in enthalpy or heat of vaporisation. In this equation, L represents the amount of heat needed to change the state of the substance, for example, from a liquid to a gas. The unit of heat absorbed is usually joules or kilojoules (kJ).

The heat absorbed by a substance can be calculated using the formula:

Q = mL

where Q is the heat absorbed, m is the mass of the substance, and L is its change in enthalpy or heat of vaporisation.

For water, the heat of vaporisation at normal atmospheric pressure is approximately 40.7 kJ/mol. This means that it takes 40.7 kJ  heat to convert 1 mole water at 100°C to steam at 100°C.

Convert the heat absorbed to kJ by using the following formula:

Q = mL = (m)(40.7 kJ/mol)

where m is the number of moles of water heated.

To calculate the number of moles, use the formula:

m = n = (mass of sample) / (molar mass of water)

The molar mass of water is 18.015 g/mol.

Plugging in the given values, we get:

m = (238.8 g) / (18.015 g/mol) = 13.21 moles

Q = (13.21 moles)(40.7 kJ/mol) = 539.24 kJ

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Answer:

Refractive index = 2

Explanation:

By the law of refraction \(n = \frac{c}{v}\):

where n is the refractive index

c is the speed of light

v is the speed of light in a certain material

We know that the speed of light c is 3*10^8 m/s

\(n = \frac{3e8}{3e8*0.5} = 2\)

Neutral atoms contain the same amount of protons and electrons, protons are electrostatic attraction, stellar spectra are absorbance spectra, and spectra may show the chemical makeup of stars.

Information about a star's temperature, chemical make-up, and inherent brightness may be found in its spectrum. A series of photographs taken at various wavelengths of the split in the star's light make up spectrograms produced by slit spectrographs.

The transitions of electrons inside atoms or ions form spectral lines, which are typically dark absorbing lines but may also be dazzling emission lines in some things.

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Both have temperature differences due to differences in their heat capacities and thermal conductivities.

There is a temperature difference between sand and water because they have different heat capacities and thermal conductivities.

Water has a higher heat capacity, meaning it can absorb more heat before its temperature increases, while sand has a lower heat capacity.

Additionally, water has a higher thermal conductivity, meaning it can transfer heat more efficiently than sand. These differences in thermal properties cause sand and water to heat up and cool down at different rates, resulting in temperature differences between them.

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If we lived in a universe that was shrinking rather than expanding, there would be several consequences:

1. Redshift instead of blue shift

2. The Universe's age would be shorter

3. If the Universe had shrunk, it is conceivable that the CMBR would not have been as consistent as it is now.

4. The shape of the Universe could be altered.

1. Redshift instead of blue shift would be observed in light from distant galaxies. As a result, the light's wavelengths would be shorter than when it was emitted, indicating that the galaxy's distance was decreasing rather than increasing.

2. The Universe's age would be shorter. The time it takes for light to travel a certain distance is proportional to the distance it has traveled, according to the speed of light. As a result, if the Universe is shrinking, the light from distant objects has traveled less than it would if the Universe were expanding. As a result, the age of the Universe would be shortened.

3. The expansion of the Universe is one of the main reasons for the cosmic microwave background's uniformity. The CMBR is a form of radiation that fills the Universe and is leftover from the Big Bang. The uniformity of the CMBR suggests that the Universe was homogenous at the time it was created. If the Universe had shrunk, it is conceivable that the CMBR would not have been as consistent as it is now.

4. The shape of the Universe could be altered. When the Universe expands, it becomes flatter, and when it contracts, it becomes rounder. The Universe's shape is determined by the matter, energy, and curvature of space-time in it. It's possible that if the Universe shrank, it would become more curved.

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Answer:

C) 8

Explanation:

number of atoms for C = 2 × 2 = 4

number of atoms for H = 2 × 2 = 4

4 + 4 = 8

Answer:

the moment of inertia with the arms extended is Io and when the arms are lowered the moment

I₀/I > 1    ⇒   w > w₀

Explanation:

The angular momentum is conserved if the external torques in the system are zero, this is achieved because the friction with the ice is very small,

           L₀ = L_f

           I₀ w₀ = I w

          w =\(\frac{I_o}{I}\) w₀

where we see that the angular velocity changes according to the relation of the angular moments, if we approximate the body as a cylinder with two point charges, weight of the arms

          I₀ = I_cylinder + 2 m r²

where r is the distance from the center of mass of the arms to the axis of rotation, the moment of inertia of the cylinder does not change, therefore changing the distance of the arms changes the moment of inertia.

If we say that the moment of inertia with the arms extended is Io and when the arms are lowered the moment will be

        I <I₀

        I₀/I > 1    ⇒   w > w₀

therefore the angular velocity (rotations) must increase

in this way the skater can adjust his spin speed to the musician.

The student turns in all directions with a compass and the needle always points north is the best evidence would best support the student's claim that earth has a magnetic field. Hence option 'B' is correct.

The area where the force of the magnetism works around the magnetic material or even a flowing electric charge is known as the magnetic field. a diagram that shows the magnetic field and how the magnetic force can be spread inside and outside of a magnetic material.

Electric ions in motion are what generate magnetism. The smallest building blocks of matter are termed atoms. There are electrons in every atom, which are charged entities. The electrons that make up an atom's nucleus, or centre, spin like tops.

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