Which statement is true of a mechanical wave?

The energy of ionizing radiation is measured in electron volts (eV).

Ionizing radiation refers to radiation that has enough energy to remove tightly bound electrons from atoms, leading to the formation of ions. The energy of ionizing radiation is typically measured in electron volts (eV), which is a unit of energy commonly used in atomic and nuclear physics.

An electron volt (eV) is defined as the energy acquired by an electron when it is accelerated by an electric field of one volt. It is a small unit of energy, and for reference, 1 eV is approximately equal to 1.6 x 10^-19 joules.

Measuring the energy of ionizing radiation in electron volts allows for convenient quantification of the energy transferred to atoms or molecules when radiation interacts with them. This is useful in various applications, such as radiation protection, medical imaging, and radiation therapy, where understanding the energy of ionizing radiation is important for assessing its effects on biological tissues and materials. Other units, such as ergs of energy per gram, one electrostatic unit, or one-person Sievert (Sv), are not commonly used for measuring the energy of ionizing radiation.

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The speed of the air on the wide side of the divider should be greater than the speed of the air on the narrow side.

Speed is the rate at which an object covers a certain distance in a given period of time. It is measured in units of distance, such as kilometers per hour (km/h), miles per hour (mph), or feet per second (fps). Speed is a scalar quantity, which means it has magnitude but no direction. Speed is usually calculated by dividing the distance an object has traveled by the time it took to travel that distance. It is important to note that speed does not necessarily equal velocity, as velocity has both magnitude and direction.

This is because the amount of space on the wide side is greater than on the narrow side, allowing more air to be pushed through the tube. Therefore, the air on the wide side will move faster due to the increased pressure.

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Answer:

The magnetic force acting on the proton is 1.68 x 10^-18 N.

Explanation:

magnetic field, B = 5 T

speed , v = 2.1 m/s

charge q = 1.6 x 10^-19 C

Angle, A = 90 degree

The magnetic force on the charge particle is given by

\(F = q v B sin A\\\\F = 1.6\times 10^{-19}\times 2.1\times 5\times sin 90\\\\F = 1.68\times 10^{-18} N\)

The two balls have the same energy when they land, hence the ball with mass 4m is moving at a speed of v/2.

Speed is defined as the ratio of the distance traveled to the time required to cover that distance. Speed is a scalar since it just has a vector and no magnitude.

Normal speed: The ratio of an object's total distance traveled to the whole time it took it to cover that distance is its average speed. Instantaneous speed: An object's instantaneous speed is the speed it is moving at at any given time while it is moving at a variable speed.

Under constant acceleration,

the distance an object moves is given by d = 0.5 A T^2

d = 0.5 A (2T)^2 d = 0.5 A 4T^2 d

= 2AT^2 and 2AT^2/(0.5 AT^2)

= 2/0.5 = 4

kinetic energy is E = 0.5MV^2

Mass = M, velocity = 2V

Second object. Mass = 4M,

velocity = V Kinetic energy

first object is: KE = 0.5M(2V)^2 = 0.5M4V^2 = 2MV^2 Kinetic energy

KE = 0.5 4MV2 = 2MV2 is the second object. They are also the same.

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ANSWER:

(a)

STEP-BY-STEP EXPLANATION:

The first thing is to make the force diagram to be able to determine the answer, just like this:

Therefore, in the y-direction, we can determine the value of the normal force as follows:

In general, the shorter the wavelength, the greater the danger to living things. Although longer wavelengths also have their hazards, very short wavelengths, such as X-rays and gamma rays, can easily damage living tissue

UV radiation is more damaging when its wavelength is shorter. Shorter wavelength UV light, however, has a lower ability to enter skin. Three bands make up the UV area, which has a wavelength range of 100 to 400 nm. UVA (315-400 nm) (315-400 nm)

A waveform signal's wavelength is defined as the separation between two identical points (adjacent crests) in adjacent cycles as the signal travels through space or along a wire. Its length in wireless systems is typically expressed in metres (m), centimetres (cm), or millimetres (mm) (mm).

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The total force, we add the forces vectorially: F_total = sqrt(F1^2 + F2^2)

To determine the magnitude of the total force exerted by the two charges on the third charge, we need to consider the electric forces between each pair of charges and then sum them up.

Let's assume the two charges are q1 and q2, located at positions (x1, y1) and (x2, y2), respectively.

The electric force between two charges is given by Coulomb's law:

F = k * |q1 * q2| / r^2

where k is the electrostatic constant (k ≈ 8.99 x 10^9 Nm^2/C^2), q1 and q2 are the magnitudes of the charges, and r is the distance between them.

Given that q1 = -2.40 nC and q2 = 3.80 nC, we can calculate the force between each charge and the third charge q3 using the formula above.

The distance between charge q1 and q3 is given by:

r1 = sqrt((x1 - x3)^2 + (y1 - y3)^2)

Similarly, the distance between charge q2 and q3 is given by:

r2 = sqrt((x2 - x3)^2 + (y2 - y3)^2)

By substituting the values into the formula, we can calculate the forces:

F1 = k * |q1 * q3| / r1^2

F2 = k * |q2 * q3| / r2^2

Finally, to find the total force, we add the forces vectorially:

F_total = sqrt(F1^2 + F2^2)

Substituting the values and performing the calculations will give you the magnitude of the total force exerted by the two charges on the third charge q3 at position (y3).

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A baseball is thrown vertically upward and feels no air resistance. As it is rising its momentum is not conserved, but its mechanical energy is conserved.

Momentum may be defined as a unique property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity.

According to the context of this question, as an object typically moves along the vertical direction, the gravitational potential energy, and the kinetic energy change. So, due to this, its momentum is not conserved, but its mechanical energy is conserved.

Therefore, a baseball is thrown vertically upward and feels no air resistance. As it is rising its momentum is not conserved, but its mechanical energy is conserved.

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Answer:

B

Explanation:

The statement that best describes the direction of heat flow by conduction between two samples of the same material is that heat flows from faster molecules to slower molecules when they collide.

Heat refers to the difference in temperature between two substances. Heat flows in the direction of an hot substance to cold.

However, in a hot substance, the particles move faster than that of a cold substance.

Therefore, the statement that best describes the direction of heat flow by conduction between two samples of the same material is that heat flows from faster molecules to slower molecules when they collide.

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Answer: A BaBr2

Explanation:

On the left side of the equation, the superscript 2 is applied to both sodium AND bromine. That means you need 2 bromine on the right. Also on the left side, the 2 AFTER chlorine only applies to the chlorine so there’s only one barium. What you have on the left has to balance with what you have on the right.

The time taken to cover a distance is the distance divided by velocity. The alligator will take 20.8 seconds to crawl 25 m with a velocity of 1.2 m/s.

Velocity of an object is the measure of the distance covered by it per unit time. It is the rate of its speed. Velocity is a vector quantity thus, having magnitude and direction.

The higher the velocity, greater will be the distance covered within short time. Velocity is the ratio of change in distance to the change in time. It has the common unit of m/s.

Given that, distance covered by the alligator  = 25 m

velocity = 1.2 m/s

then time  = distance / velocity

t = 25 m/ 1.2 m/s = 20.8 s.

Therefore, the alligator crawls 20.8 seconds to reach 25 m.

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c) both direct and alternating current

Because Ampere's Law, a magnetic field is produced whenever an electrical charge is in motion. So, both kind of currents produces a magnetic field when electrical current is flowing through a wire.

Given equation

\(\\ \sf\longmapsto N_2+3H_2\longrightarrow 2NH_3\)

Nitrogen on product side:-

\(\\ \sf\longmapsto 2(1)=2\)

Hydrogen on reactant side:-

\(\\ \sf\longmapsto 3(2)=6\)

According to the question,

The Equation is

\( \sf \: N_2 + 3H_2 \: \longrightarrow2NH_3\)

Let's balance the equation (Excluded)

\(\sf \longmapsto \: N_2 + 3 H_2 = 2 NH_3\)

Hydrogen atoms on product side:

\(\sf \longmapsto2 \times 1\)

\(\sf \longmapsto \: 2\)

Nitrogen atoms on the reactant side:

\(\sf \longmapsto \: 3 \times 2\)

\(\sf \longmapsto \: 6\)

There fore,

Product side

\( \sf \: 2\)

Reactant side

\( \sf6\)

Answer:

75 volt

Explanation:

Current (I) = 5 A

Resistance (R) = 15 Ω

Voltage (V) = ?

We know

R = V/I

15 = v / 5

v = 75 Volt

To calculate the average velocity of the airplane, we need to divide the total displacement by the total time taken. The displacement is the distance traveled in a specific direction.

Given:

Distance traveled (displacement) = 1,592 miles (east)

Time taken = 3.68 hours

Average Velocity = Displacement / Time

Since the displacement is in the east direction, we consider it positive.

Average Velocity = 1,592 miles / 3.68 hours ≈ 432 miles per hour (rounded to the nearest whole number)

Therefore, the average velocity of the airplane is approximately 432 mph.

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Answer:

please help

Explanation:

Answer:

It is always said that mass is same everywhere.

Answer:

\(Q=197505J\)

Explanation:

From the question we are told that:

Mass \(m=2500g=2.5kg\)

Initial heat of pan \(i_h=190 \tetxtdegree\)

Final heat of pan \(f_h=25˚C \tetxtdegree\)

Generally the equation for Heat energy released is mathematically given by

 \(Q=mC \triangle T\\\\Q=2.5*462 *(190-26)\\\\Q=1155 *(190-26)\\\\Q=1155 *(171)\\\)

 \(Q=197505J\)

Therbligs are basic physical elements of motion used in methods time measurement exercises to analyze and measure work processes. They represent the smallest unit of time and the full range of motions required to complete a job.

Therbligs were introduced by Frank B. Gilbreth, an industrial engineer, as a means to analyze and improve work processes. They are used in methods time measurement exercises to break down a task or job into its fundamental motions. Each therblig represents a specific basic physical element of motion, such as grasp, position, release, search, transport, and so on. These elements can be combined in different sequences to represent the full range of motions required to complete a job. Therbligs are used to measure the time required to perform each individual motion, and by summing up the times for all therbligs involved, the total time to complete a job can be determined. By analyzing the therbligs involved in a task, engineers can identify inefficiencies, eliminate unnecessary motions, and streamline work processes to increase productivity and reduce fatigue or strain on workers.

Therefore, therbligs serve as a standardized method for measuring and evaluating work processes, allowing for improvements in efficiency and productivity. They represent both the smallest unit of time used in methods time measurement exercises (individual motions) and the largest unit of time (the full range of motions required to complete a job).

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Answer:

9.0 V.

Explanation:

battery gives the voltage of 9.0 V to the lantern to use it.

The voltage across the bulb in camping lanterns is equal to the potential difference across the cells that are used to power it. So, 9 V.

Potential difference between two points is defined as the amount of work required to move a unit positive charge along any path between two places in the electric field without accelerating the charge.

Here,

While the one point has a lower potential, the other one has a higher potential. The term voltage or potential difference refers to the charge difference between higher and lower potentials.

The force needed for the electrons to move through a circuit is provided by the voltage or potential difference.

In a series circuit, the voltage across a bulb is equal to the voltage across the battery only if the bulb and the battery are the only components in the circuit.

Hence,

The voltage across the bulb in camping lanterns is equal to the potential difference across the cells that are used to power it. So, 9 V.

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For Each Of The Following Scenarios Described Where A Molecule Or Ion Is Moving From One Side Of A Membrane To The Other, Option A is correct answer.

Scenario A: Oxygen moving across a plasma membrane Answer: A. Simple Diffusion Scenario B: Glucose moving across a plasma membrane Answer: C. Facilitated Diffusion By A Carrier/Transport Protein Scenario C: Sodium moving across a plasma membrane Answer: B. Facilitated Diffusion By A Channel Protein Scenario D: Water moving across a plasma membrane Answer: A. Simple Diffusion : Simple diffusion allows the nonpolar and small molecules to pass through the plasma membrane without any assistance of proteins. In facilitated diffusion, larger polar molecules or ions move across the membrane through the help of transport proteins. Transport proteins are of two types, channel and carrier proteins. Channel proteins provide an open path for the molecules to move whereas carrier proteins hold the molecules to move across the membrane and change their shape.

Option A is correct answer.

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Answer:

Metallic bonding is the bond that exist between the atoms. The electrons do not only flow at its respective atoms but instead, contribute to a sea of delocalised electrons. As a result, metals can conduct electricity as the delocalised electrons are able to carry charges.

Explanation:

Answer:

Her final displacement is 0.4 km North

Her total distance is  8.2 km

Explanation:

Given;

initial position, = 2.5 km north

then 4.3 km south

final position = 1.4 km north

let northward direction = positive direction

let southward direction = negative direction

The final displacement = 2.5 km North - 4.3 km South + 1.4 km North

The final displacement = -0.4 km North

Thus, the magnitude of the final displacement = 0.4 km North

In distance, the direction of the motion is not considered

The total distance = 2.5 km + 4.3 km + 1.4 km

The total distance = 8.2 km

Answer:

Explanation:

A is not correct. That means that D is since they offer exactly the opposite meanings.  

C is rubbish. One pole could not be stronger than the other. Heaven help us if touched the stronger pole.

B the very point of a magnet is that it does matter how the atoms are orientated.

The magnitude (absolute value) of the input impedance of a short-circuited half-wave section of cable is 30 Ω.

The magnitude (absolute value) of the input impedance of a short-circuited half-wave section of cable at 1 GHz is 30 Ω. Let's discuss why it is so.A short-circuited half-wave section of cable has a length of λ/2 (half-wavelength). The half-wavelength line produces an input impedance of approximately 30 Ω when the line is short-circuited.

The input impedance of the half-wavelength line at any frequency is purely resistive, and its value is determined by the length of the line. The input impedance of a short-circuited transmission line is the geometric mean of its characteristic impedance and its terminating impedance, according to the theory.

When the terminating impedance is zero ohms, the input impedance of a short-circuited transmission line is always half of its characteristic impedance. Therefore, at 1 GHz, the magnitude (absolute value) of the input impedance of a short-circuited half-wave section of cable is 30 Ω.

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Answer:

10.4 m/s²

Explanation:

use the formula:  V² = Vo² - 2aΔx

Plug in the known values then solve for a.  Vo = 0 because the car starts from rest.

(25 m/s)² = 0 + 2a(30m)

a = (625 m²/s²)/(2)(30m) = 10.4 m/s²

Answer:

Measurement of heat is done in calories. One calorie is the amount of energy required to raise one gram of water one degree Celsius. To measure heat, you divide the change in temperature of a sample of water by the mass of the water.

Answer:

To measure heat, you divide the change in temperature of a sample of water by the mass of the water.

Explanation:

The way we can measure that heat is by using something called the Calorie.

2mv is the magnitude of the impulse delivered by the wall to the ball.

What is Velocity ?

Velocity is a vector quantity that describes the rate of change of an object's position. It is equal to the displacement of an object divided by the time interval over which the displacement occurred. Velocity has both magnitude and direction, and its units are typically meters per second (m/s). The velocity of an object can change over time due to acceleration, and if an object is moving in a circular path, it also has a component of velocity perpendicular to its direction of motion, known as centripetal velocity.

Impulse = change in momentum

J = m(v - u)

  = m(v-(-v))

J = 2mv

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Answer:

C

Explanation:

because acceleration is the rate of change of velocity.

Answer:

C

Explanation:

bcuz i said its c cuzzo