A dental X-ray typically affects 218 g of tissue and delivers about 3.3 μJ
of energy using X-rays that have wavelengths of 0.020 nm.
a. What is the energy Ephoton
, in electron volts, of X-ray photons?
b. How many photons are absorbed during the dental X-ray? Assume the body absorbs all of the incident X-rays.

Answer:

true

Explanation:

as long as it is the right conductive material

H everywhere is 20π p A/m in the azimuthal direction, where p is the radial coordinate in cylindrical coordinates.

The integral form of Ampere's Law relates the magnetic field H to the current passing through a closed loop. In cylindrical coordinates, the current density is given by J(r, θ, z) = N·P(r)·uϕ(θ), where N is the number of turns per unit length, P(r) is the volume current density, and uϕ(θ) is the unit vector in the azimuthal direction.

To find H everywhere, we consider a closed loop in the azimuthal direction (ϕ) at a fixed radial distance p. Along this loop, the length element dl is in the azimuthal direction, and the magnetic field H is also in the azimuthal direction.

Applying Ampere's Law, the integral of H·dl over the closed loop equals μ0 times the total current enclosed by the loop. Since the current is uniform and flowing in the azimuthal direction, the total current enclosed is J·2πp, where J is the volume current density and 2πp is the path length along the loop at radial distance p.

Setting up the integral and solving, we have:

H·2πp = μ0·J·2πp

H = μ0·J = μ0·N·P(r) = 20πp A/m.

Therefore, H everywhere in the azimuthal direction is given by H = 20πp A/m.

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Answer:

Tide rising and falling would be different from the moon near the Earth .

Answer:The motion of an aircraft through the air can be explained and described by physical principals discovered over 300 years ago by Sir Isaac Newton. Newton worked in many areas of mathematics and physics. He developed the theories of gravitation in 1666, when he was only 23 years old. Some twenty years later, in 1686, he presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis." The laws are shown above, and the application of these laws to aerodynamics are given on separate slides.

Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia. The key point here is that if there is no net force acting on an object (if all the external forces cancel each other out) then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. If an external force is applied, the velocity will change because of the force.

The second law explains how the velocity of an object changes when it is subjected to an external force. The law defines a force to be equal to change in momentum (mass times velocity) per change in time. Newton also developed the calculus of mathematics, and the "changes" expressed in the second law are most accurately defined in differential forms. (Calculus can also be used to determine the velocity and location variations experienced by an object subjected to an external force.) For an object with a constant mass m, the second law states that the force F is the product of an object's mass and its acceleration a:

F = m * a

For an external applied force, the change in velocity depends on the mass of the object. A force will cause a change in velocity; and likewise, a change in velocity will generate a force. The equation works both ways.

The third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal force on object A. Notice that the forces are exerted on different objects. The third law can be used to explain the generation of lift by a wing and the production of thrust by a jet engine.

You can view a short movie of "Orville and Wilbur Wright" explaining how Newton's Laws of Motion described the flight of their aircraft. The movie file can be saved to your computer and viewed as a Podcast on your podcast player.

Explanation:

Answer:An atom of the element barium (Ba) has two valence electrons.

Explanation:

The equation of motion for the system consisting of a mass sliding on a flat surface with friction, a hanging block, and a pulley can be expressed as follows. Let the mass of the sliding object be represented by m, the radius of the pulley by R, and the friction coefficient between the sliding object and the surface by μ. The equation of motion is given by:

m*a = m*g - μ*m*g + (m*R^2 + I)*α

where a is the acceleration of the sliding object, g is the acceleration due to gravity, α is the angular acceleration of the pulley, and I is the moment of inertia of the pulley.

The equation of motion for this system can be derived by considering the forces acting on each component. The force of gravity, mg, acts vertically downward on the hanging block and the sliding object. The frictional force, μmg, opposes the motion of the sliding object. As the sliding object moves, it exerts a tension force on the pulley, causing it to rotate. The torque produced by this tension force is equal to (m*R^2 + I)*α, where R is the radius of the pulley and I is its moment of inertia.

By applying Newton's second law, we equate the sum of the forces on the sliding object (m*a) to the net force acting on it, which includes the force of gravity, the frictional force, and the force caused by the tension on the pulley. This results in the equation of motion mentioned above.

Solving this equation of motion allows us to determine the acceleration of the sliding object and the angular acceleration of the pulley, which describe the motion of the system.

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The equation of motion is given by: m*a = m*g - μ*m*g + (m*R^2 + I)*α

Here a is the acceleration of the sliding object, g is the acceleration due to gravity, α is the angular acceleration of the pulley, and I is the moment of inertia of the pulley.

The equation of motion for this system can be derived by considering the forces acting on each component. The force of gravity, mg, acts vertically downward on the hanging block and the sliding object. The frictional force, μmg, opposes the motion of the sliding object. As the sliding object moves, it exerts a tension force on the pulley, causing it to rotate. The torque produced by this tension force is equal to (m*R^2 + I)*α, where R is the radius of the pulley and I is its moment of inertia.

By applying Newton's second law, we equate the sum of the forces on the sliding object (m*a) to the net force acting on it, which includes the force of gravity, the frictional force, and the force caused by the tension on the pulley. This results in the equation of motion mentioned above.

Solving this equation of motion allows us to determine the acceleration of the sliding object and the angular acceleration of the pulley, which describes the motion of the system.

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Answer:

\(g_h = -39.4\ m/s^2\)

Explanation:

The formula for the value of the acceleration due to gravity at a height "h" from the surface of Earth is given as follows:

\(g_h = g(1-\frac{2h}{R} )\)

where,

\(g_h\) = acceleration due to gravity at height h from the surface of Earth = ?

g = acceleration due to gravity on the surface of the Earth = 9.81 m/s²

h = height from the surface of the Earth = 1.6 x 10⁷ m

R = Radius of the Earth = 6.378 x 10⁶ m

Therefore,

\(g_h = (9.81\ m/s^2)(1-\frac{2(1.6\ x\ 10^7\ m)}{6.378\ x\ 10^6\ m})\)

\(g_h = -39.4\ m/s^2\)

The capacitance after each of the following single changes is made is: (a) C/2, (b) kC, (c) C, (d) C/2, (e) C

The capacitance of a parallel-plate capacitor is given by the formula:

C = ε₀A/d

where ε₀ is the permittivity of free space, A is the area of the plates, and d is the distance between the plates.

(a) If the plate separation distance is doubled, the capacitance will be halved: C' = ε₀A/(2d) = C/2

(b) If a dielectric material with dielectric constant k is inserted between the plates, the capacitance will be multiplied by k: C' = kε₀A/d = kC

(c) If the potential difference across the plates is doubled, the capacitance will remain the same: C' = C

(d) If the plate area is halved, the capacitance will be halved: C' = ε₀(A/2)/d = C/2

(e) If the applied emf is increased until the plate charge doubles, the capacitance will remain the same: C' = C

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Answer:

Option 2

Explanation:

Since they want to know kinetic energy being increased, it cannot be Options 1 or 3. So now we're left with 2 and 4. 4 seems to be decreasing, so we can eliminate that. So, our answer is Option 2.

Answer:

100m/s

Explanation:

speed of wave=frequency × wave length

=10 × 10

=100m/s

Answer:

100 m/s

Explanation:

Formula :

Solving using the given values :

The statement "therapist dealing with psychological disorders can be classified into two main categories. in the first, , a trained professional talks to clients to help them overcome difficulties, whereas influences the brain directly through drugs or other treatment" is true.

Therapists dealing with psychological disorders can be classified into two main categories: psychotherapists and psychopharmacologists. Psychotherapists primarily rely on talk therapy and various therapeutic techniques to help clients overcome difficulties and improve mental health through communication and understanding.

On the other hand, psychopharmacologists focus on influencing the brain directly through the use of drugs or other treatments. They are specialized medical professionals, such as psychiatrists, who prescribe medications to alleviate symptoms of psychological disorders. Psychopharmacologists work in conjunction with psychotherapists to provide a comprehensive approach to treating psychological disorders.

Therefore, the statement is true as it accurately reflects the two main categories of therapists dealing with psychological disorders.

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Complete question :  

therapist dealing with psychological disorders can be classified into two main categories. in the first, , a trained professional talks to clients to help them overcome difficulties, whereas influences the brain directly through drugs or other treatments. T/F

Total resistance (RT) = 2 ohms

Total current (IT) = 20 Amperes

Voltage across R1 (VR1) = 100 Volts

Current through R2 (IR2) = 1 Ampere

Current through R3 (IR3) = 5 Amperes.

To find the total resistance (RT) in a parallel circuit, we can use the formula:

1/RT = 1/R1 + 1/R2 + 1/R3

Given:

R1 = 5 ohm

R2 = 20 ohm

R3 = 4 ohm

Substituting the values into the formula:

1/RT = 1/5 + 1/20 + 1/4

To simplify the equation, we find the common denominator:

1/RT = (4 + 1 + 5) / 20

1/RT = 10 / 20

Simplifying further:

1/RT = 1/2

Now, taking the reciprocal of both sides:

RT = 2 ohm

Therefore, the total resistance of the circuit is 2 ohms.

To find the total current (IT) flowing through the circuit, we can use Ohm's Law:

IT = V / RT

Given that the voltage across the parallel circuit is 40V and the total resistance is 2 ohms:

IT = 40V / 2 ohm

IT = 20A

Hence, the total current flowing through the circuit is 20 Amperes.

The voltage across R1 (VR1) can be found using Ohm's Law:

VR1 = IT * R1

VR1 = 20A * 5 ohm

VR1 = 100V

Therefore, the voltage across R1 is 100 Volts.

The current flowing through R2 (IR2) can be found using Ohm's Law:

IR2 = IT * (1/R2)

IR2 = 20A * (1/20 ohm)

IR2 = 1A

Hence, the current flowing through R2 is 1 Ampere.

Similarly, the current flowing through R3 (IR3) can be found using Ohm's Law:

IR3 = IT * (1/R3)

IR3 = 20A * (1/4 ohm)

IR3 = 5A

Therefore, the current flowing through R3 is 5 Amperes.

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As the scattering angle θ in the Compton effect increases, the energy of the scattered photon decreases.

The Compton effect is a phenomenon that occurs when a photon collides with a free electron. During the collision, the photon transfers some of its energy to the electron, causing the photon to lose energy and shift to a longer wavelength. The amount of energy lost by the photon is dependent on the scattering angle, with larger angles resulting in greater energy loss. This is because the momentum of the photon is conserved during the collision, and the change in direction (or scattering angle) of the photon results in a change in its momentum. Therefore, as the scattering angle increases, the change in momentum of the photon also increases, leading to a greater loss of energy.

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Answer:

so basically what you gotta do is, and then you can do that but you shouldn't do this

Explanation:

The problem here deals with relative dating of fossils in a stratigraphic column.

To solve this problem, we apply one of the rules of interpreting a session which is the principle of fossil and fauna succession:

    "fossils and fauna in a geologic sequence succeed one another in a predictable way".

  The oldest fossil is found in the oldest bed usually at the bottom of the sequence.

The youngest fossil is found at the top of the beds.

1. Oldest organism in the sequence;

  Trilobite

2. Organism in the youngest layer;

   Fern

3. Older organism between Crinoid and Ammonite;

       Ammonite

The ammonite is below the crinoid in the sequence.

The four tick marks on Earth correspond to the four major time zones: Eastern Time, Central Time, Mountain Time, and Pacific Time.

The first tick mark corresponds to Eastern Time, which is located in the eastern part of the United States and includes major cities such as New York and Miami. This time zone is five hours behind Greenwich Mean Time (GMT-5), and typically corresponds to early morning hours.

The second tick mark corresponds to Central Time, which is located in the central part of the United States and includes major cities such as Chicago and Dallas. This time zone is six hours behind Greenwich Mean Time (GMT-6), and typically corresponds to mid-morning hours.

The third tick mark corresponds to Mountain Time, which is located in the western part of the United States and includes major cities such as Denver and Phoenix. This time zone is seven hours behind Greenwich Mean Time (GMT-7), and typically corresponds to early afternoon hours.

The fourth and final tick mark corresponds to Pacific Time, which is located on the west coast of the United States and includes major cities such as Los Angeles and Seattle. This time zone is eight hours behind Greenwich Mean Time (GMT-8), and typically corresponds to late afternoon or early evening hours.

It's important to note that these time zones are only applicable to the United States and that other countries have their own time zones that may differ. Additionally, some countries may not observe daylight saving time, which can further affect the time difference between different locations.

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Answer:

See solution below

Explanation:

The standard equation of a wave is represented by: Y = Asin 2π(x/λ – ft)

A is the amplitude

λ is the wavelength

f is the frequency

t is the time

Comparing the standard with the given equation Y = 0.005sin 2π(0.5x – 200t)

i) A = 0.005m

Amplitude is 0.005m

ii) ω = 2πf

ω = 2π(200)

ω = 400π rad/s

iii) ω = 2πf

400π = 2πf

200 = f

Swap

f = 200Hertz

iv) Period = 1/f

Period = 1/200

Period = 0.005secs

v) wave number  =

vi) Wavelength λ

0.5x = x/λ

0.5 = 1/λ

λ  = 1/0.5

λ = 2m

vii) velocity - fλ

velocity = 200 * 2

velocity = 400m/s

Answer:

Explanation:

Sphere B and sphere A are touching so they will act as a single body . A positively charged sphere C is brought near sphere B . So there will be induction of charge on sphere B and sphere A . Opposite charge will be induced on nearer sphere and same charge will be induced on distant sphere . Hence sphere B will be negatively charged and sphere A will be positively charged. The amount of charge induced on sphere B and A will be same and it will remain as long as sphere C is kept near sphere B . As soon as sphere C is removed , induced charges will also neutralize each other .

Answer:   True

Explanation:

When drawing a vector, you should represent the magnitude of the vector by the length of the arrow is true.

What are vectors?
The term "vector" in mathematics and physics is used informally to refer to some values that cannot be stated by a single integer (a scalar) or to certain members of vector spaces. In the past, vectors were first used to represent quantities with both a magnitude and a direction, such as displacements, forces, and velocity, in geometry and physics (usually in mechanics). Similar to how distances, masses, and time are represented by real numbers, these quantities are represented by geometric vectors.

In some circumstances, tuples—finite sequences of numbers with a definite length—are sometimes referred to as vectors.

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Answer:

Active energy is a characteristic of Kinetic energy

Answer:

Answer is A

Explanation:

As we know , for constant velocity we get a straight line.

The formula for this problem is s = vt which is similar to a straight line formula like y = mx + c.

If we put here c = 0 we get the formula for distance and velocity.

So the answer is A.

To find the minimum time a car takes to cover the 800 m length of the turn, we need to first determine the maximum speed the car can safely maintain without skidding. To do this, we'll use the formula for the maximum speed in a circular turn:

v_max = √(μRg) where v_max is the maximum speed, μ is the coefficient of friction, R is the radius of curvature, and g is the acceleration due to gravity. Given μ = 0.4, R = 400 m, and g = 10 m/s², we can calculate v_max: v_max = √(0.4 × 400 × 10) = √(1600) = 40 m/s Now that we have the maximum speed the car can maintain, we can find the minimum time required to cover the 800 m turn. To do this, we can use the formula: time = distance / speed Given the distance is 800 m and the speed is 40 m/s: time = 800 / 40 = 20 seconds Therefore, the car will take a minimum of 20 seconds to cover the total length of the turn, given the special design prevents it from overturning.

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Answer:

Get Hired

Start a business

rent out your house

Sell online

Take surveys

Explanation:

Answer:

1 can be working with a family member and helping them with their work and earning money from that.

2 getting a job that fits your age limit.

3 doing chores around your home.

4 babysitting your siblings or family member and charging a decent fair price.

5 helping with pets or helping around outside

Explanation:

Answer:

graph b

Explanation:

graph a isnt constant

graph c is slower (less steep slope)

graph d is slowing down (starts high ends low)

Answer:

I'm not 100% sure but I think its Cell membrane

Explanation:

please, correct me if i'm wrong.

Answer: The main sequence stars lying in different places differ from each other mainly by having different luminosities and temperatures.

What is an H-R diagram?

An H-R diagram is a plot of stars' luminosity (brightness) versus their surface temperature. On the x-axis, surface temperature is represented, while on the y-axis, luminosity is represented. This plot is used to analyze the characteristics of stars and can provide information such as its temperature, radius, mass, and luminosity.

It is a useful tool for astronomers because it can identify different types of stars, including giants, supergiants, and white dwarfs. It can also be used to compare the various stages of a star's life and to predict how stars evolve over time.

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Answer:

false a curciut is just a loop of electricity goes in and negative comes out  when using a battery the negative goes in and the goes out making a battery have two sides to a uircute.

hope this helps!  

Explanation: