How much potential energy does a 20-kg barrel have when it is in the truck whose floor is 5.0 m above the ground? P.E. = J

Answer:

Electromagnetic waves do not require a medium in order to transport their energy. Mechanical waves are waves that require a medium in order to transport their energy from one location to another. ... Sound is a mechanical wave and cannot travel through a vacuum.

Sound waves are mechanical waves that require a medium to travel through, and consist of longitudinal pressure waves, exhibiting features like frequency which determines pitch. They transfer energy, not mass, and the speed of sound depends on the medium's properties.

Sound waves are mechanical waves, which means they require a medium, such as air, water, or solid materials, to transmit energy. Unlike electromagnetic waves, mechanical waves cannot travel through a vacuum; they need a physical medium to propagate. Sound waves, specifically, are longitudinal pressure waves which means they consist of compressions and rarefactions in the medium. Within these waves, energy is transferred from one location to another, but not mass itself. The speed at which sound waves travel depends on the physical properties of the medium they move through.

Additionally, sound waves have characteristics like amplitude, wavelength, period, and frequency. Frequency is particularly significant as it determines the pitch of the sound; higher frequencies result in higher pitches, while lower frequencies result in lower pitches. The frequency of sound is measured in hertz (Hz), which represents the number of waves that pass a point per unit of time. Humans typically hear frequencies between 20 and 20,000 Hz, and this range decreases with age. Animals, however, can perceive higher frequencies than humans, such as dogs hearing up to about 40,000 Hz and dolphins up to 150,000 Hz.

Answer:

D. agrarian

Explanation:

The agrarian society is a society that is strictly revolving around the agriculture and animal farming for its survival. In this type of society, the people are only engaged in producing food, be it by planting and raising certain crops or breeding domesticated animals. The main purpose of this type of society is to be able to produce enough food for the whole year, so it is a self maintaining society that consumes as much as it produces. The situation described about Ken is a reflection of this type of society.

Answer:  = D.  agrarion

Answer: She should find that the speed of sound travels fastest in liquid water. It would travel slowest in water vapor.

In most substances, sound travels faster in solids than it does in liquids.

Water, however, is consisted of hydrogen bonds. These bonds cause water to expand when it is froze. So, water is actually less dense in solid form. In liquid form, water is denser than it is in solid form. Saying that, sound would travel fastest in liquid water because there are more molecules to oscillate and therefore conduct sound. This is all because water is denser in liquid form as opposed to solid form. Therefore, liquid water conducts sound better than solid water or water vapor.

Answer:

2.Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune

Explanation:

1. I do not understand what is being asked.

If you could comment with more understandable question ill do my best to help. (:

Answer:

Star y is closer

Explanation:

The brighter the star appears the closer it is to the earth. That is why the sun seems like the biggest and brightest star but in reality it is just closer than other stars.

Mercury, venus, earth, Mars, Jupiter, Saturn, Uranus, and Neptune

Answer:

D.Radiography uses ionizing radiation, but sonography does not.

Explanation:

Radiography is the process of using x-rays or gamma rays to capture images showing internal parts of the human body for medical examinations.X-rays are commonly used in this process.x-rays are categorized as a cancer causing agent thus exposure to such rays could cause development of cancer.In sonography, high frequency sound waves are used. There is no exposure to any ionization radiation like in radiography.

Answer:

3 Newtons

Explanation:

The work done by Kendall is given by:

[tex]W=Fd[/tex]

where

F is the force

d is the displacement of the sofa

In this problem, we know

W = 30 Nm = 30 J

d = 10 m

So we can solve the formula for F to find the force used by Kendal:

[tex]F=\frac{W}{d}=\frac{30 J}{10 m}=3 N[/tex]

Final answer:

To find the force Kendall used to push her sofa, we divide the work done (30 Nm) by the distance (5 m), which equals 6 Newtons. However, since this answer is not among the options, the force Kendal used is unknown.

Explanation:

The question asks how much force Kendall used to push her sofa halfway across her living room when she did 30 Newton-meters of work. Since work equals force times distance (Work = Force x Distance), we can rearrange the formula to solve for force (Force = Work / Distance). In this case, Kendall pushed the sofa 5 meters (halfway across a 10-meter room), so the force she exerted can be calculated as follows:

Force = Work / Distance

Force = 30 Nm / 5 m

Force = 6 Newtons

However, this value does not match any of the options provided in the question. Therefore, based on the given answer choices, the force Kendal used is unknown.

Answer:

Yes, an Anion is an ionic species, which has a negative charge.

Explanation:

Hope my answer has helped you!

Answer:

11.3 A

Explanation:

First of all, we need to find the equivalent resistance of the two appliances in parallel, which is given by:

[tex]\frac{1}{R_{12}}=\frac{1}{R_1}+\frac{1}{R_2}=\frac{1}{15 \Omega}+\frac{1}{20 \Omega}=0.116 \Omega^{-1}\\R_{12} = 8.6 \Omega[/tex]

Then we know that these two appliances are connected in series to another resistor of

[tex]R_3 = 2 \Omega[/tex]

So the total resistance of the circuit is

[tex]R=R_{12}+R_3 = 8.6\Omega + 2\Omega = 10.6\Omega[/tex]

And since we know the voltage of the source,

V = 120 V

We can now calculate the current in the circuit by using Ohm's law:

[tex]I=\frac{V}{R}=\frac{120 V}{10.6 \Omega}=11.3 A[/tex]

Answer:

it is under water

Explanation:

Lines on the bottom of a swimming pool look wavy from above due to refraction, the bending of light as it moves from water to air. Reflection can also distort underwater images. The apparent shortening of waded legs in water is similarly caused by light refraction.

The reason lines on the bottom of a swimming pool can look wavy when viewed from above is due to the optical phenomenon known as refraction. When light passes from one medium to another, for instance, from water to air, it changes speed and is bent at the boundary between the two mediums. This bending of light rays can make straight lines on the pool bottom appear distorted or wavy to an observer looking from above the water.

As described in the reference, the image of a swimmer or other objects can look different because of both reflection and refraction. Total internal reflection can cause images to be reflected back into the water, while refraction at the water's surface can make the bottom of the pool look shallower than it truly is. The illustrated example of how objects can change position and shape due to wave motion further underlines the role of water's dynamic surface in distorting underwater images.

In addition, the phenomenon that makes a person's legs appear very short when wading in a pool is also explained by the refraction of light. A ray diagram would illustrate how light from the feet travels through water, bends as it exits the water, and then reaches the observer's eyes, causing a visual distortion of the legs' length and position in the water.

Answer:

250 N

Explanation:

The acceleration of the 50 kg cart under 750 N of force is:

F = ma

750 N = (50 kg) a

a = 15 m/s²

To accelerate from 13 m/s to 17 m/s takes:

v = at + v₀

17 m/s = (15 m/s²)t + 13 m/s

t = 4/15 s

To accelerate in 3 times as many seconds (t = 4/5 s):

17 m/s = a (4/5 s) + 13 m/s

a = 5 m/s²

So the force is:

F = ma

F = (50 kg) (5 m/s²)

F = 250 N

You could also have reasoned this without the calculations.  3 times the time means 1/3 the acceleration which means 1/3 the force.

Oil must be mined from underground.

Answer:

[tex]\Delta T = 0.81 ^oC[/tex]

Explanation:

As we know by energy conservation

All its kinetic energy will convert into thermal energy to raise its temperature

[tex]\frac{1}{2}mv^2 = ms\Delta T[/tex]

now divide both sides by mass of the object

[tex]\frac{1}{2}v^2 = s\Delta T[/tex]

so change in temperature is given as

[tex]\Delta T = \frac{v^2}{2s}[/tex]

[tex]\Delta T = \frac{25^2}{2\times 387}[/tex]

[tex]\Delta T = 0.81^oC[/tex]

To calculate the increase in temperature for the copper sphere, one needs to equate its kinetic energy to the heat gained by the copper and solve for the temperature increase using the copper's specific heat capacity. Without knowing the mass of the sphere, the calculation cannot be completed.

Understanding the Increase in Temperature of a Copper Sphere

When a copper sphere moving at 25 m/s hits another object and all its kinetic energy (KE) is converted into thermal energy, the increase in temperature can be calculated using the equation for kinetic energy and the formula for heat transfer involving specific heat capacity:

KE = ½ * m * v2

Where m is the mass of the sphere and v is the velocity. Once the kinetic energy is known, his is linked to the thermal energy (ΔQ) gained by the copper sphere:

ΔQ = m * c * ΔT

Here, c is the specific heat capacity of copper, and ΔT is the temperature increase we need to find. Given that the entire KE is converted to thermal energy, we set ΔQ equal to KE and solve for ΔT, which directly gives us the increase in temperature of the copper sphere.

Without the mass of the copper sphere, we cannot determine the exact temperature increase from the information provided. However, if we have the mass, we can use the above equations to find the numerical value of the increase in temperature.

Answer:

A region where all earthquakes occur

Explanation:

Answer: Option (3)

Explanation: In the given image, the plate boundary that is being shown is a transform plate boundary, in which the two plates are moving, slide passing one another. Here neither plate destroys nor creates. For example, The San Andres fault.

The areas that are included in this transform plate boundary are very prone to earthquakes and tsunamis. Earthquake generates when the plates rubs one another, releasing energy that causes seismic waves to propagates. This causes an earthquake of varying intensity.

Thus, the correct answer is option (3).

Answer:

Using the sun's energy to heat a building; the windows, walls, and floors can be designed to collect, store, and distribute solar energy in the form of heat in the winter (and also to reject solar heat in the summer).

Lemme know if this helped :D!

a system of putting the sun's energy to use without requiring mechanical devices to distribute the collected heat.

Answer:

480 J/kg/°C

Explanation:

To find the heat capacity of the metal, we must first find the heat lost by the metal, which means we must find the heat gained by the water.

Heat gained by water:

q = mCΔT

q = (0.150 kg) (4200 J/kg/°C) (20°C - 15°C)

q = 3150 J

Heat lost by metal:

q = mCΔT

-3150 J = (0.100 kg) C (15°C - 80°C)

C ≈ 480 J/kg/°C

Answer:

When an object turns around an internal axis (like the Earth turns around its axis) it is called a rotation. When an object circles an external axis (like the Earth circles the sun) it is called a revolution.

Rotation: Earth’s rotation is why we have day and night (it turns on its axis)

Revolution: Earth’s revolution is what we base our years after (the Earth revolving around the sun)

Answer:

your answer is:  electron → carbon atom → quantum dot → E. coli bacteria cell → comma

Explanation:

Answer:

A.

Explanation:

Edge 2021

Answer:

Read Below for answer

Explanation:

Kinetic energy is the kind of energy present in a body due to the property of its motion

Potential Energy is the type of energy present in a body due to the property of its state

Final answer:

Potential energy is stored energy due to position or state, able to have both positive and negative values, while kinetic energy, always positive, refers to the energy of motion. Energy can transition between these two states, and kinetic energy correlates directly with the speed of an object.

Explanation:

Potential energy differs from kinetic energy in that it represents the energy stored within an object due to its position or state, whereas kinetic energy is the energy of motion. An essential distinction between potential energy and kinetic energy is that potential energy can have a negative value when it implies a release of stored energy, leading to it being lower than the initial state.

Conversely, kinetic energy is always a positive value because it is directly correlated with motion—it increases as the speed of the object increases.

An example of potential energy is a stretched bow, whereas a revolving wheel illustrates kinetic energy. Energy can transition between potential and kinetic; for instance, when a ball reaches the peak of its bounce and begins to fall, its potential energy converts to kinetic energy.

The different types of potential energy, such as elastic, gravitational, and chemical, have unique sources and characteristics but share the common feature of being stored energy that can be converted to kinetic energy under the right circumstances.

W = 4.9N. The weight of a basketball with a mass of 0.5Kg is 4.9N.

The weight of an object is the force of gravity on the object and can be defined as the product of the mass by the acceleration of gravity, w = mg.

W = (0.5Kg)(9.8 m/s²) = 4.9N

The weight of the basketball is calculated by multiplying the mass of the ball by the acceleration due to gravity. The gravitational potential energy is calculated using the height of the ball above the ground when the player is about to shoot.

The weight of a basketball with a mass of 0.5 kg can be found by using the formula for weight (W = mg), where m is mass and g is the acceleration due to gravity (approximately 9.81 m/s2 on Earth). To calculate the gravitational potential energy (GPE) of the netball when the player is about to shoot, the formula for potential energy (GPE = mgh) is used, where h is the height of the ball above the ground. The ball's mass is given as 0.5 kg, and from the provided information, the total height (h) when she is about to shoot is the sum of her height and the distance the ball is held above her head (1.7 m + 0.5 m), which totals to 2.2 m. Therefore, the gravitational potential energy at that moment is GPE = 0.5 kg × 9.81 m/s2 × 2.2 m.

Answer:

C. is correct option.

Explanation:

Speed of sound in a particular temperature depends upon bulk modulus and density of material.

It is directly proportional to bulk modulus of material and inversely proportional to the density.

As we move from air to aluminium, their density increase which decrease speed of sound in them. But as we move down to their bulk modulus also increases and increase in that bulk modulus is too much comparable to their increase in density.(You can google their density and bulk modulus respectively).

So, at the end their bulk modulus factor overcome the sound that decreased due to density.

And overall sound increases .

Therefore the speed of sound is higher in solids than in liquids.

Answer: A

Explanation:the other ones was wrong

Answer: D (sandy clay loam)

Explanation:

It is because it is 55 percent sand, and 25 percent clay, so it has to be more sandy than silty. Much of it is by sand, so it is sandy. Loam is a fertile soil of clay and sand, so it is D.

Answer:

D. sandy clay loam

Explanation:

This soil type is normally made up of sand along with varying amounts of silt and clay.

a. distance: 10 km

The distance covered is equal to the sum of the distance of each part of the journey.

In this case, Sarah's trip consists of three parts:

- 2 km north from the house to the grocery store

- 3 km north to grandma's house

- 5 km back to reach home

So the distance covered is the sum of all these parts:

d = 2 km + 3 km + 5 km = 10 km

b. displacement: 0

Instead, displacement is defined as the distance (measured in a straight line) between the final point of the motion and the initial point of the motion. So displacement does not depend on the path taken by the object, but only on the final and initial position.

Here we have:

- Final position of Sarah's journey: home

- Initial position of Sarah's journey: home

So, the displacement is zero, because the final point corresponds to the initial point.

Answer:

1.23 m

Explanation:

The vertical distance covered by a free-falling object starting from rest in a time t is

[tex]y=\frac{1}{2}gt^2[/tex]

where

g = 9.8 m/s^2 is the acceleration due to gravity

In this problem, we have

t = 0.50 s

So the distance covered is

[tex]y=\frac{1}{2}(9.8 m/s^2)(0.50 s)^2=1.23 m[/tex]

Answer:

B. By adding the number of protons and the number of neutrons

Explanation:

The atomic mass is determined by adding the number of protons and neutrons in an atom. An atom is made up of three fundamental particles: Electrons, Protons and Neutrons.

The protons and neutrons occupy a central region in an atom known as the nucleus. The nucleus is positively charged and mass concentrated.

If we compare the relative masses of the subatomic particles, the masses of protons and neutrons would be 1 and that of an electron would be 1/1840. This shows that the mass of electrons are negligible.

In order to ascertain atomic mass, we therefore add the number of protons and neutrons together. This is how we arrive at 12.011 as the value of the atomic mass of C and for other elements.

The atomic mass is also known as the mass number.

The atomic mass of an element including carbon is determined by adding the number of protons and neutrons in its most common atomic form. Electrons do not appreciably contribute to the atomic mass due to their extremely small mass.

The atomic mass of carbon, as presented in the image, is 12.011. This is determined by the sum of the number of protons and neutrons in most common form of an atom of an element. For example the most common isotope of carbon, Carbon-12, has six protons and six neutrons for a total of 12 subatomic particles in its nucleus. This means the mass number of Carbon-12 is 12.

Note that electrons, while they are part of the atom, do not appreciably contribute to the mass of an atom because their mass is exceedingly small. Thus, in response to the question the atomic mass of an element is determined by B 'By adding the number of protons and the number of neutrons' .

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Answer:

5,878,625,373,183.6 miles

the answer is (c) because if you say

[tex]moment = f \times d| = 500n \times 2.0m = 1000nm[/tex]

The total moment about point P of the diver and the board is 1000N.m. The correct option is C.

The equal and opposite force acting at a point from the axis of rotation is called the moment of force.

M = F x r

Given is the force = 500N and the distance between diver and board r =2m, the moment will be

M = 500 x 2

M  = 1000N.m

Thus, the correct option is C.

Learn more about moment of force.

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Answer:

The answer is Glare

Explanation:

When sunlight reflects from a horizontal surface, horizontally polarized light reflects more strongly than the rest of the sunlight. This reflection produces glare. To block the glare, polarized sunglasses have vertically polarized filters, which block the horizontally polarized light.

The bottom of this wave is called the Trough.

Yes, a metal piece of 18cm away can be attracted by a magnet that has 20cm of magnetic field.

The magnet is having a magnetic field of 20cm. And the Metal piece is 18cm far from the magnet.  Usually, magnetic fields decrease in strength as you move farther away from the magnet. The strength of the attraction will depend on various factors, including the strength of the magnet, the properties of the metal, and the orientation of the magnet

However, since the metal is within the 20 cm range of the magnet's magnetic field, it experiences some level of attraction.

To learn more about Magnetic field:

https://brainly.com/question/7802337

Final answer:

A piece of metal 18 cm away from a magnet, which has a 20 cm magnetic field, will be attracted to the magnet because it falls within the magnet's magnetic field range, where magnetic forces are strong enough to attract ferromagnetic materials.

Explanation:

If a magnet has a 20 cm magnetic field and a piece of metal is 18 cm from the magnet, the piece of metal will indeed be attracted to the magnet. This is because the piece of metal falls within the magnet’s magnetic field range. The magnetic field is the region around a magnet where magnetic forces are exerted on ferromagnetic materials like iron, nickel, and cobalt. Since the piece of metal is closer than the full extent of the magnetic field (20 cm), it falls within the sphere of influence where it can be attracted to the magnet.

Magnetic fields are invisible but can be visualized through the use of iron filings or other methods. They illustrate how magnetic forces decrease with distance. However, within its range, a magnet can exert a force sufficient to attract compatible materials. Hence, a piece of metal located 18 cm from a magnet, within the 20 cm range of its magnetic field, will be subject to this magnetic force and drawn towards the magnet.

Answer:

B. There would be no energy available for consumers

Explanation:

The producers are the basis and foundation of all ecosystems. If something dramatic happens to the populations of producers and they are wiped out, then the ecosystems will crumble and nothing will be left of them. The reason for this is that the producers are the ones that produce the energy, and they are the ones that are the food source, thus energy source for the consumers. Once they are gone, the organisms that consumed the producers will starve to death. The predators will have lot of food from the dying prey, but that will only last for a couple of weeks, and after that they will starve to death as there will be no more food left for them.