if the distance between a point mass and the pivot point is doubled, the rotational inertia of the object about that point is multiplied by .

Three piñatas hang from the (stationary) assembly of massless pulleys and cords. One long cord runs from the ceiling at the right to the lower pulley at the left, looping halfway around all the pulleys. Several shorter cords suspend pulleys from the ceiling or piñatas from the pulleys. The weights (in newtons) of two piñatas are given then the weight of the third piñata is (-3T - W1 - W2) N and the tension in the short cord labeled with T is ((4T - 2W1 - 2W2) / 3) N.

a) Since the assembly of pulleys and cords is massless, the tension in the long cord is the same throughout. Let T be the tension in the long cord. According to the hint, the tension in the cords that loop halfway around the pulleys is 2T. Let W1 and W2 be the weights of two piñatas given. Since the system is in equilibrium, the weight of the third piñata, W3, can be calculated as follows

2T + W1 + 2T + W2 + 2T + W3 = T

Simplifying the above equation, we get

W3 = T - 4T - W1 - W2

W3 = -3T - W1 - W2

Therefore, the weight of the third piñata is (-3T - W1 - W2) N.

b) The tension in the short cord labeled with T can be found by analyzing the forces acting on the lower pulley. Let T1 be the tension in the cord supporting the lower pulley on the right side, and T2 be the tension in the cord supporting the lower pulley on the left side. Since the pulley is in equilibrium, the tension in the short cord can be calculated as follows

2T1 + T2 = 2T

Simplifying the above equation, we get

T2 = 2T - 2T1

The tension T1 can be calculated by analyzing the forces acting on the upper pulley on the right side. Let T3 be the tension in the cord supporting the upper pulley on the right side. Since the pulley is in equilibrium, the tension T1 can be calculated as follows

T3 = T1 + W1

Solving the above two equations, we get

T1 = (2T - W1 - W2) / 3

Substituting the value of T1 in the equation for T2, we get

T2 = (4T - 2W1 - 2W2) / 3

Therefore, the tension in the short cord labeled with T is ((4T - 2W1 - 2W2) / 3) N.

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According to the question of density, the moment of inertia at the 25 cm mark is 0.875 kg m².

Density is a measure of mass per unit of volume. It is expressed as a ratio of the mass of a substance to the volume it occupies. The density of a material can be used to identify it and can be used to compare different substances. The density of a gas, liquid, or solid is usually expressed in g/cm³, kg/m³, or lb/ft³. Density is an important physical property that can be used in many different fields, including engineering, physics, chemistry, geology, and biology.

With the use of the parallel axis theorem, we can determine the moment of inertia at the 25-cm mark of the metre stick. The parallel axis theorem asserts that the following equations can be used to determine the moment of inertia about an axis that is perpendicular to and d distances distant from the axis through the centre of mass:

I = I_cm + M*d2

where M is the object's mass, I_cm is its moment of inertia through its centre, and d is the space between its two axis.

The moment of inertia (I_cm) through the mass centre is set to be 0.5 kg m2. The distance 'd' is 25 cm because we must determine the moment of inertia at that point.

The distance 'd' needs to be converted from centimetres to metres first:

d = 25 cm = 25 * 0.01 m = 0.25 m

The mass of the metre stick must then be determined. The mass is distributed uniformly over the length of the metre stick because of its consistent density. For convenience, we might assume that the metre stick is one metre long.

The definition of density () is mass per unit volume.

equals volume / mass

Because the metre stick has a consistent density, the volume and length are proportionate. As a result, the mass (M) and length are both proportionate.

Since the metre stick is one metre long, we can write:

M = k * 1

where 'k' is a proportionality constant.

We can calculate 'k' by using the fact that the moment of inertia through the centre of mass (I_cm) is given as 0.5 kg m2. The formula for a uniform rod's moment of inertia around its centre of mass is (1/12) * M * L2, where L is the rod's length.

Using the formula and the known values as substitutes, we obtain:

0.5 kg m^2 = (1/12) * k * 1 * 1^2

As we simplify the equation, we discover:

0.5 = (1/12) * k

k = 0.5 * 12 = 6

With the value of 'k' in hand, we can now calculate the mass (M) of the metre stick:

M = 6 * 1 = 6 kg

The parallel axis theorem can be used to determine the moment of inertia at the 25 cm point.

I = M * d2 + I_cm

I = 0.5 kg m2 + 6 kg * (0.25 m)2

I = 0.5 kg m2 + 6 kg * 0.0625 m2

I = 0.5 kg m2 + 0.375 kg [tex]m^{2}[/tex]

I = 0.875 kg m^2

As a result, the moment of inertia at the 25-cm mark of the metre stick is 0.875 kg m2.

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The answer is D) 100 ohms.

To calculate the resistance of a light bulb, we can use Ohm's law:

Resistance (R) = Voltage (V) / Current (I)

We know that the power (P) of the light bulb is 100 watts and the voltage (V) is 110 volts. We can use the formula:

Power (P) = Voltage (V) x Current (I)

to solve for the current:

Current (I) = Power (P) / Voltage (V) = 100/110 = 0.909 A

Now we can use Ohm's law to calculate the resistance:

Resistance (R) = Voltage (V) / Current (I) = 110 / 0.909 = 121 ohms

Therefore, the 100-watt light bulb operating on a 110-volt household circuit has a resistance closest to 100 ohms.
Hi there! To answer your question, let's use the formula for power (P): P = V^2 / R, where V is voltage and R is resistance.

You have a 100-watt light bulb operating on a 110-volt household circuit. So, P = 100 watts and V = 110 volts.

100 = (110)^2 / R

Now, we'll solve for R:

R = (110)^2 / 100
R ≈ 12100 / 100
R ≈ 121 ohms

None of the options A, B, C, or D match the result. There might be a mistake in the options provided. Based on the calculations, the resistance should be approximately 121 ohms.

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The work done by the magnetic field on each particle is the same and is not zero.

A magnetic field is a region in space where a magnetic force is present. This force is caused by the motion of electrically charged particles, such as electrons and protons, and is felt as a force that can attract or repel other magnetic objects. Magnetic fields are created by magnets, or by electric currents. The Earth has its own magnetic field, which is produced by the motion of the planet's molten iron core. Magnetic fields can be used to create energy, power motors, and generate electricity.

This is because the work done by the magnetic force on a charged particle is equal to the product of the charge of the particle, the magnetic field strength and the angle through which the charge moves in the magnetic field. Since both particles have the same charge (1.6 x 10^-19 C) and the same angle, the work done on them is the same.

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The unit of intensity expressed in fundamental SI units is watts per square meter (W/m²).

Intensity is a measure of the amount of energy that passes through a given area per unit time. The SI unit of energy is the joule (J), and the SI unit of time is the second (s). Therefore, the unit of energy per unit time is J/s, which is also known as a watt (W).

The area over which the energy is spread is expressed in square meters (m²). So, the unit of energy per unit area per unit time is W/m², which is the fundamental SI unit of intensity. In other words, if a wave has an intensity of 1 W/m², it means that 1 watt of energy is passing through each square meter of area per second.

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Answer:

new moon phase 15

Explanation:

993J/kg°C is the specific heat of this metal. This metal might be aluminum.

Which definition of specific heat is the most accurate?

The amount of heat required to raise the temperature of one gram of a substance by one degree Celcius is known as the substance's specific heat. This number can be used to indicate a substance's capacity to absorb heat because it is constant for all substances.

The amount of energy needed to change the state of 1 kilogram (kg) of a substance without affecting its temperature is known as specific latent heat. The word "specific," which indicates that the material is being measured per unit mass, distinguishes it from latent heat.

H ⇒ E/M(T2-T1)

E ⇒ 6640J

M will be 0.348kg

T2 ⇒ 43.6 °C

T1  ⇒ 22.4 °C

H ⇒ 6640J/0.348kg( 43.6 °C- 22.4 °C )

H ⇒ 993J/kg°C

We can therefore say that this metal might be aluminum.

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The symbols used in this question are commonly used in the study of electromagnetism. The circle with a dot represents a magnetic field pointing out of the screen, while the circle with an x represents a magnetic field pointing into the screen.

The line represents a conductor, which is a material that allows electricity to flow through it. The bar represents a sliding conductor, which can move freely along the direction of the line. The arrow labeled "v" indicates the direction in which the conductor or sliding conductor is moving. Understanding these symbols is important in analyzing the behavior of electric currents and magnetic fields in different situations, such as in motors and generators.

To answer your question about the different symbols used in magnetic fields and conductors, the circle with a dot denotes a magnetic field pointing out of the screen, while the circle with an 'x' represents a magnetic field pointing into the screen. A line in this context represents a conductor, which is a material that allows electric current to flow through it. On the other hand, a bar symbolizes a sliding conductor, a type of conductor that can move or slide within the magnetic field. Lastly, an arrow labeled "v" indicates the direction in which the conductor or sliding conductor is moving. This notation helps to visualize and understand the behavior of conductors within magnetic fields.

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Therefore, depending on which two variables Aretha knows, she can use Ohm's law to calculate either the resistance or current of the circuit.

Using Ohm's law, we can calculate the resistance or current of the circuit if we know the other two variables. Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them.

So, if Aretha knows the voltage (110 V) and the resistance (240 Ω) of the circuit, she can calculate the current flowing through the circuit using the formula:

Current (I) = Voltage (V) / Resistance (R)

I = 110 V / 240 Ω

I = 0.458 A

Conversely, if Aretha knows the voltage (110 V) and the current (0.458 A) flowing through the circuit, she can calculate the resistance of the circuit using the formula:

Resistance (R) = Voltage (V) / Current (I)

R = 110 V / 0.458 A

R = 240 Ω

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Answer: There isn't a whole ton of oxygen in space, and if they run out, they will probably die.

Explanation:

This one kind of speaks for itself.

According to the question the options are e. centripetal, friction, and coriolis forces.

Centripetal force is a force that acts on a body moving in a circular path and is directed toward the center of the circle. It is the force that keeps an object in circular motion, such as a satellite in orbit around a planet. The magnitude of the centripetal force depends on the speed of the object and the radius of the circle, and is equal to the product of the mass of the object and the square of its velocity, divided by the radius of the circle.

Centripetal force is a force that acts to keep an object moving in a circular path and is not applicable to an object at rest.
Friction force is the force that opposes the relative motion between two objects that are in contact with each other, and can only act on an object when it is moving.
The Coriolis force is the force generated by the Earth's rotation that causes a curved path for freely moving objects on the Earth's surface, and thus is not applicable to a stationary body.

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The wavelength of radiation with a frequency of 6.24 x 10^13 sec-1 can be calculated using the equation c = λv.

The wavelength of radiation with a frequency of 6.24 x 10^13 sec-1 can be calculated using the equation c = λv,

where c is the speed of light (3 x 10^8 m/s),

λ is the wavelength and v is the frequency.

Rearranging this equation, we get λ = c/v, which means that λ = 4.81 x 10^-6 meters.

The electromagnetic spectrum is a range of frequencies of electromagnetic radiation. It includes radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. Each type of radiation has a different wavelength and frequency, with radio waves having the longest wavelength and lowest frequency, while gamma rays have the shortest wavelength and highest frequency.

In conclusion, the wavelength of radiation with a frequency of 6.24 x 10^13 sec-1 is 4.81 x 10^-6 meters. This frequency falls in the range of infrared radiation on the electromagnetic spectrum, which is just below the visible light range. Answering this question required knowledge of the relationship between frequency, wavelength, and the speed of light, as well as an understanding of the electromagnetic spectrum.

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The measurement by a person would be E. Mary equal to c, Brandon equal to c

Both Mary and Brandon would measure the speed of light as c (the speed of light in a vacuum, approximately 299,792 km/s). This is because the speed of light is constant for all observers, regardless of their relative velocities, according to the theory of special relativity.

As a consequence of this principle, if Mary and Brandon are both moving at different velocities relative to each other, they would still measure the speed of light as c. This is true regardless of their motion or the direction from which they measure the light.

It means that no matter how fast or in which direction Mary or Brandon are moving, the speed of light would always appear to be the same for both of them.

This phenomenon has been experimentally confirmed through various experiments and observations, and it is a fundamental principle in our understanding of the nature of space and time.

The constancy of the speed of light is one of the key insights that led to the development of Einstein's theory of relativity and has significant implications for our understanding of the universe.

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Answer:

Explanation: Factors that affect the acceleration of an object include the force of an object and mass of an object and velocity of an object

When light of wavelength 700nm is incident normally, 24 dark lines are observed, the thickness of the foil is 16,800nm .

Light is a form of energy that is both visible and invisible to the human eye. It is a form of electromagnetic radiation, consisting of waves that travel through a vacuum at the speed of 186,000 miles per second. Light can be made up of a variety of wavelengths, such as infrared, ultraviolet, and visible light. Visible light is composed of the colors of the rainbow, red, orange, yellow, green, blue, indigo, and violet. Light plays a vital role in photosynthesis, the process by which plants convert light energy into chemical energy.

The thickness of the foil can be calculated using the equation for the spacing between the dark lines in a diffraction pattern: d = λ/(2sin θ),where d is the spacing between lines, λ is the wavelength of light, and θis the angle of incidence. In this case, λ= 700nm and θ = 0° (since the light is incident normally to the foil). Thus, the spacing between lines d = 700nm/(2sin0°) = 700nm. Since there are 24 lines, the thickness of the foil is 24[tex]*[/tex]700nm = 16,800nm.

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Therefore, the maximum value of the magnetic field 10 m from the isotropic point source of light is 5.30 x 10⁻³ T (tesla).

The maximum value of the magnetic field can be calculated using the relationship between the electric and magnetic fields in an electromagnetic wave, known as the wave impedance (Z). The wave impedance is given by:

Z = E/B

where E is the electric field and B is the magnetic field.

For an isotropic point source of light, the electric and magnetic fields are perpendicular to each other and to the direction of propagation. Therefore, the maximum value of the magnetic field can be calculated using the maximum electric field and the wave impedance of free space, which is approximately 377 ohms.

B = E/Z

B = (2.0 V/m) / 377 ohms

B = 5.30 x 10⁻³ T

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Driving behind a large truck on the highway can be intimidating, but it's important to be aware of the truck driver's blind spots to ensure your safety and the safety of others on the road.

Blind spots, also known as "no-zones," are areas around the truck where the driver's visibility is limited. These blind spots are much larger than those of a car, and they extend to the sides, front, and rear of the truck. If you cannot see the driver's face in their side mirror, then you are likely in their blind spot. In addition, if you cannot see the truck's side mirrors, the driver probably cannot see you. To avoid being in a truck's blind spot, it's best to stay a safe distance behind the truck and try to pass it quickly and safely when necessary. Always use your turn signals and make sure the truck driver sees you before making any lane changes. Remember that large trucks also require more space to stop, so avoid cutting in front of them too closely. By being aware of a truck's blind spots and taking extra precautions, you can help keep the roads safe for everyone.

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The emf induced in a coil is given by the equation:

emf = -N dΦ/dt

Where N is the number of turns in the coil, Φ is the magnetic flux through the coil, and dt is the change in time.

When the magnet is dropped from a height h through the coil, it induces a changing magnetic flux through the coil. As the magnet enters the coil, the flux through the coil increases, and as the magnet exits the coil, the flux through the coil decreases. The rate of change of the magnetic flux through the coil is therefore maximum at the moment the bottom of the magnet enters the coil and at the moment the top of the magnet leaves the coil.

The emf induced in the coil is proportional to the rate of change of the magnetic flux. Therefore, the ratio of the emf induced in the coil at the moment the bottom of the magnet enters the coil to the emf induced in the coil at the moment the top of the magnet leaves the coil is equal to the ratio of the rate of change of the magnetic flux at these two moments.

Since the magnet is of length 1, the rate of change of the magnetic flux is the same at both ends of the magnet. Therefore, the ratio of the emf induced in the coil at the moment the bottom of the magnet enters the coil to the emf induced in the coil at the moment the top of the magnet leaves the coil is 1:1 or simply 1.

The induced current in the loop: cannot be calculated from the given data.

Induced current is an electric current that is generated due to a change in a magnetic field. This type of current is induced by Faraday's Law of Induction which states that any change in the magnetic flux in a closed loop of wire will create an electromotive force (EMF) that causes an electric current to flow. This type of current is created when a magnetic field is moving relative to a conductor or when the magnetic field around the conductor is changed. Induced current is also generated when a conductor is moved through a static magnetic field. In this case, the conductor creates its own magnetic field, which then interacts with the static field of the magnet.

The induced current in the loop cannot be determined from the given data since it is not given how the magnetic field is changing over time.

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The net force acting on an object moving in a straight line at a constant speed is zero.

Force is an influence that causes an object to change its current state of motion, direction, shape, or energy levels. Force is a vector quantity, meaning it has both magnitude and direction. Some of the most common examples of forces are gravity, friction, tension, and normal force. Force can be exerted through physical contact or even at a distance, such as the force of a magnet. Force is a measure of the amount of energy required to move an object. Force is the product of mass and acceleration, and it is measured in Newtons. Force is an important concept in physics and is used to explain many everyday phenomena.

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The radius of the circle of light on the ground is approximately 19.06 feet.

To solve this problem, we can use trigonometry. We know that the light fixture is 24 feet above the ground and the angle at the top of the cone is 44 degrees.

We can create a right triangle with the height being 24 feet, the angle between the height and the hypotenuse being 44 degrees, and the radius of the circle of light as the base of the triangle.
We can use the tangent function to solve for the radius (base) of the triangle:
tan(angle) = opposite side/adjacent side
In this case, the angle is 44 degrees, the opposite side is the radius (which we're trying to find), and the adjacent side is the height, 24 feet. Plugging in the given information, we get:
tan(44) = radius/24
To solve for the radius, multiply both sides by 24:
radius = 24 * tan(44)
Using a calculator to find the tangent of 44 degrees and then multiplying by 24, we get:
radius ≈ 19.06 feet
The radius of the circle of light on the ground is approximately 19.06 feet.

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The dsinθ = nλ equation is a mathematical expression of the phenomenon of diffraction, which is the bending of waves around small obstacles or through small openings.

A phenomenon is any event or circumstance that is observed and studied. It can be natural or man-made, and can occur on a small or large scale. Phenomena can be both physical and psychological, and can be studied in the natural and social sciences. Phenomena can be described as anything that is observable, measurable, and verifiable. Examples of phenomena include natural disasters, psychological disorders, economic trends, social movements, and anything else that can be observed and studied. Phenomenology is the study of phenomena, and seeks to understand the underlying causes and meanings of events, occurrences, and behaviors.

Diffraction occurs when a wave encounters an obstacle or opening that is comparable in size to its wavelength. The dsinθ = nλ equation states that the angle of diffraction (θ) is related to the wavelength of the wave (λ) and the number of wavelengths (n) between the source and the point of diffraction.

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As used in the laws of reflection and refraction, the "normal" direction is: perpendicular to the interface.

Refraction is the bending of light, sound, or other waves as they pass from one medium to another. The bending of light when it passes from one medium to another is known as optical refraction. This is why a straw in a glass of water appears to be bent even though it is straight. Refraction occurs because the speed of the wave changes as it moves from one medium to another. For example, light moves faster in air than it does in water, so when it passes from air to water, it bends. Refraction also affects sound waves and other forms of energy, such as radio waves. Refraction is used in lenses and prisms to bend and focus light, and is responsible for the way lenses can correct vision. Refraction also occurs naturally in the atmosphere and is responsible for phenomena such as rainbows.

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The resultant velocity of the plane relative to the ground will be 70 mi/h a plane can travel with a speed of 80 mi/hr with respect to the air.

a. A headwind would diminish the resultant speed of the plane to 70 mi/hr.

             resultant velocity = 80-10

                                            =70 mi/hr

b. The plane's final speed would rise to 90 miles per hour if there was a tailwind.

                   resultant velocity = 80 + 10

                                                = 90 mi/hr

c. The plane's final speed would rise to 80.6 miles per hour in the event of a crosswind of 10 miles per hour.

                        resultant velocity =√(802+102)

                                                  = 80.62 mi/hr

The Pythagorean theorem can be used to figure this out: √[(80 mi/hr)² + (10 mi/hr)²])

d. A crosswind of 60 mi/hr would raise the plane's final velocity to 100 mi/hr. The Pythagorean theorem can be used to figure : √[ (80 mi/hr)² + (60 mi/hr)² ] )

                     resultant velocity = √(802+602)

                               = 100 mi/hr

The relative velocity refers to how one observer would perceive another moving object within their own frame. The velocity of an object when there are multiple influences on its motion in a fixed reference frame is known as the resultant velocity.

Incomplete question:

A plane can travel with a speed of 80 mi/hr with respect to the air. Determine the resultant velocity of the plane (magnitude only) if it encounters a

a. 10 mi/hr headwind.

b. 10 mi/hr tailwind.

c. 10 mi/hr crosswind.

d. 60 mi/hr crosswind.

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At the moment the car is at the north end of the circle and slowing down, the acceleration vector points to the south.

When an object moves in a circular path at a constant speed, it is still accelerating because its direction is changing. This acceleration is called centripetal acceleration and it always points towards the center of the circle. When the car is slowing down at the north end of the circle, its velocity vector is still pointing towards the east or west direction (tangent to the circle). Therefore, the acceleration vector must be pointing towards the center of the circle, which is south of the car. This is because the centripetal acceleration vector always points towards the center of the circle and is perpendicular to the velocity vector.

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When a person pushes against a floor, the floor exerts a force that propels the person forward. This force is known as the reaction force and is equal in magnitude and opposite in direction to the force applied by the person on the floor. According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. So, when a person pushes against the floor, the floor pushes back with an equal force, propelling the person forward.

The pushing force does not eliminate the frictional force; rather, it allows the person to overcome it. Friction is the force that opposes motion between two surfaces in contact, and it can be present between the person's feet and the floor. When the person pushes against the floor, the force overcomes the frictional force, allowing the person to move forward.

It is the combined effect of the pushing force and the reaction force that allows a person to move forward when they push against a floor. The person's legs push forward on the floor, and the floor pushes back, propelling the person forward.

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The capacitance is about 14 μF, and the answer is (B).

What is Capacitor?

A capacitor is an electrical component that stores electric charge and energy in an electric field. It is made up of two conductive plates separated by an insulating material, called a dielectric. The conductive plates can be made of metal or other conductive materials, while the dielectric can be made of materials such as glass, plastic, or air.

Vmax is the maximum voltage across the capacitor, t is the time, R is the resistance in series with the capacitor, and C is the capacitance.

At t = 10 ms, the voltage across the capacitor is half the final value, so:

V(10 ms) = 0.5 Vmax

Substituting this into the equation above and solving for C, we get:

0.5 Vmax = Vmax (1 - e^(-10 ms/RC))

0.5 = 1 - e^(-10 ms/RC)

e^(-10 ms/RC) = 0.5

-10 ms/RC = ln(0.5)

RC = 10 ms / ln(2)

Now, we can use the given resistance of 720 Ω to solve for the capacitance:

RC = 720 Ω * C

C = RC / 720 Ω

C = (10 ms / ln(2)) / 720 Ω

C ≈ 14 μF

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The highest harmonic that could be heard by a person who is capable of hearing frequencies up to 1.00×104 Hz is the 20th harmonic.

Harmonic is a term that describes a relationship between two or more tones in which their frequencies are related in a simple mathematical ratio. When two or more tones sound simultaneously and their frequencies are related in this way, they create a pleasant, consonant sound. It is the basis of music theory and the foundation of the harmonic series. The harmonic series is an infinite sequence of pitches that are based on the fundamental frequency of a note, which is the main note or tone of a chord. The harmonic series is used to create chords, melodies, and various other musical elements.

This is because the 20th harmonic is the highest frequency that can be generated when the fundamental frequency is 1.00×104 Hz. The fundamental frequency is the lowest frequency that is generated in a harmonic series, and the higher harmonics have frequencies that are multiples of the fundamental. Therefore, the 20th harmonic would be 20 times the fundamental frequency, or 2.00×105 Hz.

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The force that lets you start a fire by rubbing a flint rock with high-carbon steel is called the force of friction.

Friction is a form of force that resists the relative motion of two objects that are in contact with each other. It is a non-conservative force, meaning that the total work done by friction is dependent on the path taken. Friction is caused by the surface roughness of the two objects and the amount of force that is applied. The amount of friction between two objects is determined by the coefficient of friction between the two materials. Friction can be beneficial in some situations, such as providing traction on the ground or allowing two objects to move in the same direction without slipping. On the other hand, friction can be detrimental in other situations, such as causing increased wear on objects or reducing the efficiency of mechanical systems.

Friction is the force that resists the motion of two surfaces sliding against each other, and it is generated when two objects move relative to one another. In this case, the two objects are the flint rock and the high-carbon steel, and the friction generated between them allows you to create sparks that can be used to start a fire.

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Answer:

sound waves

Explanation:

sound waves are mechanical waves that need a medium like air to propagate throuh