Three students observe a toy car rolling across a level floor until it slows to a stop. After the observation, they make these statements: Max: "Energy is conserved, but friction turned it into heat, warming the floor and wheels." Chris: "But it stops. Energy is not conserved. The car's kinetic energy disappeared." Sam: "But energy can't just disappear. It must have become potential energy." Which student was correct?

Answer:

Some of the key characteristics of galaxies and galaxy clusters include their size, shape, and structure. Galaxies and galaxy clusters are also distinguished by the presence of dark matter, a mysterious substance that is thought to make up most of the mass in the universe. Additionally, galaxies and galaxy clusters are important sites for the formation and evolution of stars and other celestial objects.

Explanation:

Galaxies are vast collections of stars, gas, and dust that are held together by gravity. They come in a variety of shapes and sizes, ranging from small, irregular galaxies to large spiral galaxies with well-defined arms. Galaxies also contain a central region known as the nucleus, which may be home to a supermassive black hole.

Galaxy clusters are groups of galaxies that are held together by gravity. They are the largest structures in the universe, and they can contain hundreds or even thousands of individual galaxies. Galaxy clusters are typically separated by vast distances, and they are bound together by the mutual gravitational attraction of their constituent galaxies.

The energy transfered to the hand of the watch is 0.05 J.

Energy is the ability or the capacity to perform work.

To calculate the energy transfered to the hand, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the energy transfered is 0.05 J.

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It was created with the aid of ground-breaking research into the ways in which sound travels across water and was intended to keep an eye on the Soviet Union's expanding submarine menace.

What makes sonar so crucial?

To "see" in the water, sonar uses sound waves.

Sonar is largely used by NOAA scientists to create nautical charts, find underwater navigational hazards, find and map things on the bottom like shipwrecks, and map the actual seafloor.

Leonardo da Vinci utilised a tube introduced into the water to listen for vessels in order to employ the technology for the first time, in 1490. To combat the rising threat of submarine warfare, it was developed during World War I, and by 1918, a functioning passive sonar system was in use.

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Risk Genetic a medical condition that affects one or more of your immediate relatives. having a family member who was diagnosed with a disease at a young age (typically before age 55).

The reason one child has blonde hair like their mother and their sibling has brown hair like their father, for instance, is genetic. Additionally, genes influence both the gender of newborns and why some diseases run in families.

Genetic factors play a significant role in many diseases. It follows that either all or portion of the risk is inherited from one's parents. One such illness is CADASIL, which is brought on by a mutation in just one gene.

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A vertical structural component called a steel column is employed in building to offer crucial support. They might transfer loads from beams, ceilings, floor slabs, or roof slabs to floors or foundations, or they might transport loads in compression.

Additionally, bending moments along cross-section axes may be present in steel columns. Explanation: Beam-column structural members are those that experience simultaneous heavy axial compressive loads and bending. Only the existence of eccentric load application, end moments, and transverse loads distinguishes a beam-column from a column. 3. Describe girt. They might transfer loads from beams, ceilings, floor slabs, or roof slabs to floors or foundations, or they might transport loads in compression. Additionally, bending moments near cross-section may exist in steel columns.

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Answer:

the answers are 3 seconds and 44.1 m

Answer:

44M

Explanation:

Synthetic fibers, ceramics, polymers, artificial foods and pharmaceuticals, and composites are all examples of synthetic materials. Synthetic fibers are elastic.

They can be used to produce garments as well as other items. Synthetic fibers include rayon, polyester, and nylon. Synthetic fibers (man-made fibers) are created by combining chemical monomers to form polymers through a chemical reaction known as polymerisation. Sodium hydroxide and carbon disulphide are commonly used compounds (derivatives of coal, oil, or natural gas). Synthetic materials, on the other hand, are man-made and cannot be found in nature. Synthetic items are typically generated in laboratories by combining various chemicals or by preparing molecules and substances in a laboratory.

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To find the missing angles when a transversal cuts through parallel lines, use the properties of parallel lines and the corresponding angles formed when they are cut by a transversal. The angles will always add up to 180°.

To find the missing angles when a transversal cuts through parallel lines, you can use the properties of parallel lines and the corresponding angles formed when they are cut by a transversal. When a transversal cuts through two parallel lines, corresponding angles are equal, alternate angles are equal and consecutive angles are supplementary, meaning they add up to 180°. You can use these properties to calculate the missing angles. For example, if you know one angle and its corresponding angle are equal, you can use that information to calculate the other missing angles. You can also use the fact that alternate angles are equal and consecutive angles are supplementary to calculate the missing angles. Once you have all the angles, you can verify your answer by making sure that all of the angles add up to 180°.

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In a series circuit there are 17 light bulbs, each providing 1 ohm of resistance , the total resistance is 17 ohms.

In a series circuit, the total resistance is equal to the sum of the resistances of all the components in the circuit. In this case, there are 17 light bulbs, each providing 1 ohm of resistance, so the total resistance of the circuit is 17 ohms.

This can be calculated using the equation:

Total Resistance = R1 + R2 + R3 + ... + Rn

where R1, R2, R3, etc. are the resistances of the individual components in the circuit.

In this case, the total resistance would be:

Total Resistance = 1 ohm + 1 ohm + 1 ohm + ... + 1 ohm

This simplifies to:

Total Resistance = 17 ohms

So the total resistance of the circuit is 17 ohms.

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There is a sizable mountain range slicing through the ocean floor. Far from the ridges, deep pits can be found. Deeply below sea level, guyots have eroded tops.

The evidence is gathered. These conclusions are: There is a sizable mountain range slicing through the ocean floor. Far from the ridges, deep pits can be found. Deeply below sea level, guyots have eroded tops.

Earthquake studies. Seismic investigations that show earthquakes happen along a mid oceanic ridge's rift valley and the cross-cutting fractures that offset it provide additional evidence for the spreading of the sea floor.

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Since we know that kinetic energy equals work done, kinetic energy will produce more in the first scenario.Because the first case's work was more than the second, kinetic energy exists.

Does kinetic energy vary as a result of work?

According to the work-energy theorem, the net work performed by forces acting on an item equals the change in kinetic energy.

When does kinetic energy become more significant?

The kinetic energy of an object, in contrast to potential energy, is relative to other fixed and moving things that are present in its immediate vicinity. For instance, if the object is positioned at a higher height, its kinetic energy will be higher

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The mass of the toad is 12kg if a 42N normal force from the ground causes the toad to accelerate upward at 3.5m/sec²

We know that according to newton second law of motion, which states that  acceleration increase of a molecule is corresponding to the power applied to it and is toward this power. The proportionality steady is the mass m for a consistent mass molecule or an unbending body going through translatory movement whose inactivity can be decreased to a point.

We know that from newton second law of motion F=ma  which is derived from the formula F=dp/dt where dp is the rate of change of momentum.Here. m is the mass of the body and a is the acceleration of the body.

We have F=42N,a=3.5m/sec²,m=?

Therefore,42N=m×3.5m/sec²

=>m=42N/3.5m/sec²

=>m=12kg

Hence, mass of the toad is 12kg.

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Answer:

the correct answer is B) 27.

Explanation:

To find the angle of refraction, you can use the formula:

n1 * sin(angle of incidence) = n2 * sin(angle of refraction)

where n1 and n2 are the refractive indices of the two media (in this case, air and the liquid), and the angles are measured from the normal to the surface.

Plugging in the values from the problem, we have:

1 * sin(40) = 1.5 * sin(angle of refraction)

Solving for the angle of refraction, we get:

angle of refraction = sin^-1(1/1.5 * sin(40))

Using a calculator or a table of trigonometric functions, we can find that the value of sin^-1(1/1.5 * sin(40)) is approximately 27.3 degrees.

Therefore, the correct answer is B) 27.

The building that stands at 1,776 feet tall in a nod to the Declaration of Independence is the One World Trade Center in New York City.

The One World Trade Center is the main building of the World Trade Center complex, which was built on the site of the original World Trade Center buildings that were destroyed in the September 11, 2001 attacks.

The height of 1,776 feet was chosen for the One World Trade Center as a symbolic reference to the year 1776, when the Declaration of Independence was signed. The One World Trade Center is the tallest building in the United States, and it is one of the tallest buildings in the world. It features a distinctive spire at the top that is lit up at night, making it a recognizable landmark on the New York City skyline.

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The net force acting on the bicyclist along with its own weight is 687 N. The magnitude of acceleration for this force is 10.56 m/s².

Force is a physical quantity characterised by its magnitude and direction. Force deform an object or changes its state of rest or motion. Force of a moving body  is the product its mass and acceleration.

The normal force acting on an object by ts weight = mg

thus normal force on 65 kg bicyclist = 65 Kg × 9.8 m/s² = 637 N.

The dragging force acting on him = 50 N.

The resultant force = 637 N + 50 N = 687 N

Force = m a

acceleration  = force/ mass

 = 687 N/ 65 Kg

 = 10.56 m/s².

Therefore, the net force on the bicyclist is 687 N with an acceleration of 10.56 m/s².

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Answer:

5/32 or 0.16 m/s

Explanation:

m1u1 + m2u2 = m1v1 + m2v2

(64x0) + (0.2 x 0) = (64 x v1) + (0.2 x 50)

v = (0.2 x 50) / 64

v = 5/32 or 0.16 m/s

(ignore negative sign as it means that the boat is moving the opposite direction of ball, that's why the answer was coming negative)

I hope my answer helps you.

CO2 is utilized for a variety of applications throughout the entire food industry.In addition to being used to create sugary beverages, CO2 is also employed in a number of other processes, including the drying of produce to lengthen its shelf life, the usage of dry ice to keep goods cool during shipping, the tranquilization of animals before to slaughter, and many others.

The manufacturing of food and beverages is actually made up of more than 30 different industries.Slaughterhouses, the preparation of meat, poultry, & fish, grain mills, maltings, bakery, sugar confectioneries, the preparation of vegetables and fruits oils and fats, margarine, and oil seeds, pasta, baby food, and milk products are a few examples.

The agricultural service, producers, processors, & marketers are the major segments of the food industry.

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The loss of kinetic energy of the moving car is 238,866 J

Kinetic energy is the energy in a moving object due to its motion,

K.E. = 1/2 M[tex]V^{2}[/tex]

Given in the question,

Mass of big car M1 = 1640 kg

Mass of small car M2 = 820 kg

Initial velocity of big car V1 = 0

Initial velocity of small car V2 = 25.6 km/s

using the principle of conservation of momentum,

Total momentum before collision = total momentum after collision

M1V1 + M2V2 = V (M1+M2)

1640 × 0 + 820×25.6 = V ( 1640+ 820)

V = 820 ×25.6 /2460

   = 8.53 Km/s

So, loss of kinetic energy of the small car = 1/2 M2[tex]V^{2}[/tex]

                                                                     = 1/2 × 820× ([tex](25.6)^{2}[/tex] - [tex](8.53)^{2}[/tex])

                                                                     = 238,866 J

The given question is incomplete, the complete question is

An 1640 kg car stopped at a traffic light is struck from the rear by a 820 kg car. The two cars become entangled, moving along the same path as that of the originally moving car. If the smaller car were moving at 25.6 m/s before the collision, what is the velocity of the entangled cars after the collision?

What is the loss of kinetic energy (Ki - Kf) in the situation described in the example?

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Executive agreements differ from formal treaties in that they 1) have been ruled unconstitutional by the U.S. Supreme Court. meetings of the United Nations. Option 5

The president can influence the public through : all of the above. Option 4

A treaty is ratified by the legislature, whereas executive agreements are ratified by the heads of government of two or more nations. To differentiate them from agreements that are legally enforceable, such as treaties, executive agreements are seen as having political force.

Presidents have routinely negotiated international accords on behalf of the United States without the Senate's advise or assent in recent decades. We refer to these as "executive agreements." Executive agreements are still enforceable in accordance with international law even when they are not submitted to the Senate for approval.

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C) Move the lens closer to the sensor or the film . Option (c) is the right           answer.

Assume that we are trying to take a picture or photograph of a moving object

as we know, the f-stop value tells us about the color of the image. That means it actually depicts that how dark is the image. would be. in simple words, it determines the amount of light that will be able to enter to the eye. Therefore, option a,b are incorrect.

Now the focus length of the camera is always fixed. Now let our object is moving away from the lens, then to keep it in focus, the camera must be moved closer to the object. This step is essential to keep focal length constant.

Hence, the correct option is (c).

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A point's sound intensity level is expressed in logarithmic units of decibels (dB) as a ratio between the sound there and the threshold of hearing.

Whispering is audible at 30 dB. 40 dB: Quiet sounds from the library. Fridge at 50 dB. Electric toothbrush at 60 decibels.

In decibels, sound is measured (dB). A motorcycle engine running is around 95 dB louder than a whisper (30 dB louder than typical conversation). Long-term exposure to noise levels above 70 dB may cause hearing impairment. Your ears may get immediately harmed by loud noises over 120 dB.

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The speed of the car from the given three figures is most nearly 15 m/s.

For figure 2,

we know the exerted force speed is 5 m/s, so frictional force is

[tex]F_f[/tex] = [tex]\frac{Mv^2}{\gamma}[/tex]

= [tex]\frac{M(5)^2}{\gamma}[/tex]

For figure 3,

we know the frictional force is 9. So,

9 [tex]F_f[/tex] = [tex]\frac{Mv^2}{\gamma}[/tex]

Then using two figures we can calculate the speed of the car.

equation figure 3 / equation figure 2

=> 9 = v^2 / (5)^2

=> v^2 = 9*(5^2)

=> v^2 = 225

=> v = 15 m/s

Thus, the speed of the car is 15 m/s.

Your question is incomplete, but most probably your full question was

(image attached)

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Heritage of Leavitt Using Cepheid variables, the distance to Andromeda of 2.5 million light-years was determined in the 1920s, demonstrating the galaxy's significant distance from the Milky Way.

Distance Measuring with Cepheid Variables After determining a distant Cepheid's period, its brightness can be calculated using the known characteristics of Cepheid variables.

A Cepheid's fluctuation period correlates closely with its luminosity, as Henrietta Swan Levitt observed. The Cepheid becomes increasingly bright as the variability period lengthens. Astronomers have measured the distances to distant galaxies by observing Cepheid variables.

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The distance between two wavefronts is termed as wavelength.

The wavelength of a sound wave is defined as the space between two adjacent wavefronts. The number of wavefronts the observer detects during a period of time can be used to calculate the wave's frequency.

The medium (such as a vacuum, air, or body of water) through which a wave travels determines its wavelength. Waves can be anything from music to light to water to periodic electrical signals. While light and other electromagnetic radiation use variations in electric and magnetic field strength, sound waves are variations in air pressure. Water waves are fluctuations in a body of water's height. Atomic locations change during the shaking of a crystal lattice.

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An object with the higher temperature can have less thermal energy than an object with the lower temperature because of the mass difference.

The thermal energy of an object is given by the relation,

Q = mC∆T

Where,

Q is the thermal energy,

m mass of the bodies,

C is the specific heat capacity and,

∆T is the change and temperature.

As we can see, from the above relation that thermal energy is depending on the specific heat and mass of the body. We can understand this thing by the example of an Iceberg and a cup of hot tea. The Iceberg is at a much lower temperature but it has a higher amount of thermal energy because it has a bigger amount of mass.

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Answer:

to move faster

Explanation:

momentum, product of the mass of a particle and its velocityit has both magnitude and direction. Isaac Newton's second law of motion states that the time rate of change of momentum is equal to the force acting on the particle. See Newton's laws of motion.

Answer:

gaining speed

Explanation:

The amount of force necessary to maintain an object is moving at precisely the same speed—or sliding friction—is measured. The object begins to move after the imparted force. static or sliding friction measurement.

The definition of friction force

Intensity of Friction What Is Frictional Force? Friction is the force that prevents motion when one object's face scrapes against another's surface. The mechanical advantage of a machine is diminished by friction, or even more specifically by a decline in the output to input ratio.

Why is friction an antagonistic force?

Rubbing acts as just a repelling force when one body moves through a surface. Friction is the result of two surfaces interacting with one another. If a layer is not fluid, then objects cannot move through it.

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The statement is false. Acceleration is the rate at which velocity changes over time, both in terms of speed and direction.

A point or object travelling in a straight path is accelerated if it accelerates or decelerates. Even if the speed is constant, motion on a circle is accelerated because the direction is always changing. The rate of change of displacement is defined as velocity. The rate of change of velocity is defined as acceleration. Because it includes both magnitude and direction, velocity is a vector quantity. Because it is simply the rate of change of velocity, acceleration is likewise a vector quantity. Acceleration is the change in speed or direction of an object. The rate at which velocity varies is defined as acceleration. Keep in mind that velocity has two components: speed and direction.

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The specific heat capacity of the metal, cm is 214.87 J/kg-k.

As per the given data,

we need to find  the specific heat capacity of the metal, cm.

According to the above question,

it is given that,

Weight of  chunk of an unknown metal is 1.00kg

chunk has been in boiling water for several minutes and it is quickly dropped into an insulating Styrofoam beaker containing 1.00kg of water at 18.0°C.

After stirring for 5.00 minutes, the water's temperature has reached a constant value of 22.0°C .

The water specific heat capacity  is cw = 4190J/(kg)  

Now,

temperature of metal is 100 degree celsius ( water boils at 100 degree celsius )

equilibrium temperature = 22 degree celsius

specific heat capacity of water Cw= 4190 J/kg-K

According to question, specific heat capacity of metal be Cm

Therefore,

mass of metal that is Mm = 1 kg

mass of water that is Mw = 1 kg

we know that,

heat energy lost by metal is equal to  heat energy gained by water

(assuming no heat is lost to the surroundings)

heat energy lost by metal = Mm * Cm * (100 - 22)

heat energy lost by water = Mw * Cw * (22 - 18 ) (given - initial temperature of water = 18 degree celsius)

therefore,

Mw * Cw * (22 - 18 ) = Mm * Cm * (100 - 22)

4190 * 4 = Cm * 78

Cm = 214.87 J/kg-k

Hence, the specific heat capacity of the metal, cm is 214.87 J/kg-k.

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Complete Question:

A 1.00kg chunk of an unknown metal that has been in boiling water for several minutes is quickly dropped into an insulating Styrofoam beaker containing 1.00kg of water at 18.0°C. After gently stirring for 5.00 minutes, you observe that the water's temperature has reached a constant value of 22.0°C . The specific heat capacity of water is cw = 4190J/(kg-K) . Assuming that the Styrofoam absorbs a negligibly small amount of heat and that no heat was lost to the surroundings, what is the specific heat capacity of the metal cm. Assuming that the Styrofoam absorbs a negligibly small amount of heat and that no heat was lost to the surroundings, what is the specific heat capacity of the metal, cm?