Calculate how much water you can boil while lowering 8.4 kg of coal to release heat, if it is known that the initial temperature this year is 0 C-5? (coal combustion heat is 27-10 J/kg, water heat capacity is 4200/38 °C)​

A free body diagram is a diagram that shows the direction of the forces that are acting on a body.

A free body diagram is a diagram that shows the direction of the forces that are acting on a body. We know that force is a vector quantity. This implies that the magnitude and the direction of a force are equally important when we are dealing with the forces.

Now, in a thug of war, there are two forces that are acting on the rope. The forces acts from the opposite ends in which the rope is being pulled. The rope would move in the direction in which the pulling that is exerted is found to be of greater magnitude.

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In general, collapse causes central heating, which ultimately causes temperatures conducive to hydrogen ignition. Particularly, material from the molecular cloud's outer reaches transforms gravitational potential energy into kinetic energy as it falls inward toward the cloud's core when gravity outweighs pressure.

The material is either added to the central protostar or spun out into the protoplanetary disc when it reaches the centre of the cloud, converting its kinetic energy into thermal energy. As more material is added, the protostar gets hotter and brighter.

When the centre of the object reaches temperatures of 10-15 million K and nuclear fusion starts, its central pressure and temperature likewise rise. Other angular momentum-related processes shape the material surrounding the collapsing core in the interim and regulate the volume of material engaged in the collapse.

what is kinetic energy?

Kinetic energy is a type of energy that is present in every object or particle that is moving. When work, which entails the exchange of electrons, is done on an object by applying a net force, that object acquires kinetic energy.

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A dense core of material in a molecular cloud begins to collapse due to gravity.

What is gravity?
Gravity is indeed a fundamental interaction in physics that causes all objects with mass or energy to attract one another. The electromagnetic force, the weak interaction, and the strong interaction are all significantly stronger than gravity, which is by far the weakest of a four fundamental interactions. As a result, this has no appreciable impact on subatomic particle level phenomena. However, at the macroscopic level, gravity is the most important interaction between objects and governs the movement of planets, stars, galaxies, or even light. The Moon's gravity causes sublunar tides in the oceans, just as gravity on Earth gives weight to physical objects.

As it collapses, it heats up and the central regions become hotter than the surrounding material. This causes the central regions to become more dense and the surrounding material to be expelled. The star continues to collapse and heat up until it reaches the main sequence, where it stabilizes and begins to produce energy through nuclear fusion.

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The x-axis should be labeled with the time values in seconds from 0 to 0.5, and the y-axis should be labeled with the values of x1(t) ranging from -10 to 10, considering the maximum amplitude of the signal.

To plot the signal x1(t) within the time range of 0 to 0.5 seconds, we need to determine the corresponding values of x1(t) for that time range.

Given that x1(t) = 10cos(ω1t) with ω1 = 50 Hz, we can calculate the values of x1(t) using the formula.

For the time range of 0 to 0.5 seconds:
- At t = 0 seconds, x1(t) = 10cos(ω1 * 0) = 10cos(0) = 10 * 1 = 10.
- At t = 0.5 seconds, x1(t) = 10cos(ω1 * 0.5) = 10cos(25π) ≈ -7.071.

Plotting these values on the y-axis against the corresponding time values on the x-axis will give us the graph of x1(t) within the time range of 0 to 0.5 seconds.

The x-axis should be labeled with the time values in seconds from 0 to 0.5, and the y-axis should be labeled with the values of x1(t) ranging from -10 to 10, considering the maximum amplitude of the signal.

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The force of sliding is the force required to keep an object moving at a constant velocity while it is sliding on a surface.

This force is equal in magnitude to the force of friction acting between the object and the surface, but opposite in direction. The force of friction acts between two surfaces that are in contact and is directed opposite to the direction of motion. When an object is sliding on a surface, the force of friction acts to slow the object down and eventually bring it to a stop.

If the object is moving at a constant velocity, the force of friction is equal in magnitude to the force applied to the object, but opposite in direction. This force is known as the force of sliding.

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The statement "When a permanent magnet is cut in half, one piece will be a north pole and one piece will be a south pole" is False.

When a permanent magnet is cut in half, it does not result in separating the magnet into distinct north and south poles. Instead, each resulting piece will still have its own north and south poles. This phenomenon is known as magnetic domain alignment. The domains within a magnet are regions where the magnetic moments of atoms align in the same direction, creating a magnetic field. Cutting a magnet disrupts the alignment of these domains, but it doesn't create isolated north and south poles on separate pieces.

Regardless of how a permanent magnet is divided, each resulting piece will have its own north and south poles. The magnetic field lines will still flow from the north pole to the south pole within each piece. Therefore, the statement "When a permanent magnet is cut in half, one piece will be a north pole and one piece will be a south pole" is false.

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The complete question is

which of the following statements concerning permanent magnets is false?- the direction of a magnetic field is indicated by the north pole of a compass-when a permanent is cut in half, one piece will be a north pole and one piece will be a south pole-the north pole of a permanent magnet is attracted to a south pole-magnetic field line outside a permanent magnet originate from the north pole and end on the south pole-all permanent magnets are surrounded by the magnetic field

The S.I. unit of E is NC^-1 and that of B is NA^-1 m^-1, then unit of E/B is A m/C (ampere meter per coulomb). This unit represents the ratio between the electric field and the magnetic field, indicating the strength and direction of the electromagnetic field.

The SI unit of electric field (E) is NC^(-1) (newton per coulomb) and the SI unit of magnetic field (B) is NA^(-1) m^(-1) (tesla). To determine the unit of E/B, we need to divide the unit of E by the unit of B.

Dividing the unit of E (NC^(-1)) by the unit of B (NA^(-1) m^(-1)), we can simplify the expression:

E/B = (NC^(-1))/(NA^(-1) m^(-1))

To simplify this expression, we can cancel out the common units in the numerator and denominator:

E/B = (N/C)/(N/(A m))

Now, let's simplify further by dividing the numerator and denominator:

E/B = (N/C) * (A m/N)

Canceling out the common units:

E/B = (A m)/(C)

Therefore, the unit of E/B is A m/C (ampere meter per coulomb).

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The modifications to the car design that would have the greatest effect on increasing the kinetic energy of the car is to increase the mass of the car slightly (option B).

Kinetic energy is the energy possessed by an object because of its motion. The kinetic energy equal (nonrelativistically) to one half the mass of the body times the square of its speed.

According to this question, an engineer is designing a small toy car that will be launched from rest. The engineer wants to maximize the kinetic energy of the car when it is launched by a compressed spring.

However, he can only make one adjustment to the initial conditions of the car. Considering the fact that the mass of an object is directly proportional to the kinetic energy.

This suggests that the modifications to the car design that would have the greatest effect on increasing the kinetic energy of the car is to increase the mass of the car slightly.

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The plane traveled 2125 km north and 1812 km west after 3.40 hours.

To solve this problem, we need to break down the velocity vector into its northerly and westerly components. We can use trigonometry to do this. Let's call the northerly component "v north" and the westerly component "v west". We can find v north by multiplying the velocity (835 km/h) by the sine of the angle (41.5∘) between the velocity vector and the north direction. Similarly, we can find v west by multiplying the velocity by the cosine of the angle.

Using the trigonometric functions, we get:
v north = 835 km/h x sin(41.5∘) = 625 km/h
v west = 835 km/h x cos(41.5∘) = 533 km/h

Now, to find how far north and how far west the plane has traveled after 3.40 hours, we simply need to multiply the components by the time:
Δd north = v north x time = 625 km/h x 3.40 h = 2125 km
Δd west = v west x time = 533 km/h x 3.40 h = 1812 km

So the plane traveled 2125 km north and 1812 km west after 3.40 hours.

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Answer:

friction

air drag

every thing that opposes the motion affects kinetic energy

Explanation:

kinetic energy is a energy which is increase with increase in motion and potential energy is energy stored while the object is at rest

potential energy ∝ 1/(kinetic energy)

as kinetic energy increases potential energy decreases

If ten years later, you find that you only have 3 kg left, the half-life of the material is 7.6 years.

The half-life of a radioactive substance is the amount of time it takes for half of the original sample to decay.

In this problem, we know that the initial amount of the substance was 12 kg and the final amount was 3 kg. The amount that has decayed is

12 kg - 3 kg = 9 kg.

To find the half-life of the material, we can use the formula:

N = N₀ \((1/2)^{(t/T)\)

where N is the final amount, N₀ is the initial amount, t is the time elapsed, and T is the half-life.

We can rearrange this formula to solve for T:

T = t / ln(2) * log(N₀/N)

Plugging in the values we know, we get:

T = 10 years / ln(2) * log(12 kg / 3 kg) = 7.6 years

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We will have that the picture that shows the highest average kinetic energy is image B.

It was spot on. 2.54 / 10.16 cm = 4 in C.

What is Length ?

Length is a term used to describe the distance between two points on an object or the dimension of an object along a particular axis.  Length is usually measured in units of distance, such as meters, centimeters, inches, or feet.

In physics, length is an important concept used to describe the size of objects, the distance between two points, or the dimensions of a space. In engineering and construction, length is used to design and build structures, such as bridges and buildings, to ensure they are safe and fit for their intended purpose.

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Answer:

b

Explanation:

because the same current flows through the lamps and the total voltage across all the lamps is the sum of all the separate voltages across them.

The frequency of the periodic motion of the system is 9.46 HZ

Let vf be the velocity of bullet and block system right after the collision

Applying conservation of linear momentum

mv=(m+M)v_{f}

\(\Rightarrow v=\frac{m+M}{m}v_{f}\)   --------(1)

Now we can find vf using conservation of mechanical energy after collision

\(\frac{1}{2}(m+M)v_{f}^{2}=\frac{1}{2}kd^{2}\)

\(\Rightarrow v_{f}=d\sqrt{\frac{k}{m+M}}\)

\(v=\frac{d}{m}\sqrt{k(m+M)}\)

Using all the given values we get the numeric value of the velocity of bullet before collision

The frequency of the periodic motion of the system is given by

\(f=\frac{1}{2\pi }\sqrt{\frac{k}{m+M}}=\frac{1}{2\pi }\sqrt{\frac{197}{0.0055+0.0503}}=9.46Hz\)

The wavelength is the separation between two wave crests, while troughs have the same wavelength. The number of vibrations that pass over a certain place in a second is known as the frequency and is expressed in cycles per second (Hz) (Hertz)

A parameter that represents the rate of oscillation and vibration is called frequency. Frequency may be expressed mathematically as follows: frequency = 1 Time period. Frequency is measured in h.rtz (Hz), the SI unit. A hertz (Hz) measurement is the same as one full oscillation every second.

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Answer:its b

Explanation: i took the test

When the distance between two point charges is increased by a factor of 2, the force they exert on each other decreases to 1/4 of the original force. The relation is governed by the Coulomb's Law.

According to Coulomb's Law, the force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. In this scenario, if the distance between the charges is increased by a factor of 2, it means that the new distance is twice the original distance.

Since the force is inversely proportional to the square of the distance, doubling the distance will result in the force becoming 1/4 of the original force. Mathematically, this can be represented as follows:

\(F' = F / (2^2)\)

\(F' = F / 4\)

Therefore, the force between the two charges will become 1/4 (or 25%) of the original force when the distance between them is increased by a factor of 2.

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The first and second scenario is a systematic error. The third scenario is a random error.

The first scenario is a systematic error because Wonda consistently estimates the buret volume to be between 16.1 and 16.2 mL, leading to a bias in the measurements.

The second scenario is a systematic error because the analytical balance consistently adds 0.0015 g to all measurements, leading to a bias in the measurements.

The third scenario is a random error because Remy's reading of the meniscus is subject to variation and does not consistently lead to an over or underestimation of the volume transferred. This can be reduced by using a standardized technique to read the meniscus, but the variation will still exist.

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The Debye length is a characteristic length scale used in plasma physics and electrochemistry to describe the behavior of charged particles in a medium.

It represents the distance over which the electrostatic potential of a charged particle becomes shielded by the presence of other charged particles in the medium.

To calculate the Debye length in this scenario, we need to know the concentration of ions in the solution, which is related to the pH.

In acidic solutions, such as the one described here with pH 3, the concentration of H+ ions is relatively high. We can use the following equation to calculate the Debye length:

λ_D = (ε * k_B * T) / (z^2 * e^2 * c)

where λ_D is the Debye length, ε is the dielectric constant of the solvent (assumed to be water), k_B is the Boltzmann constant, T is the temperature, z is the charge on the ion (in units of the elementary charge e), and c is the concentration of ions in the solution.

Assuming room temperature (25°C) and a 1 M concentration of H+ ions (corresponding to pH 0), we can calculate the Debye length to be approximately 0.1 nm.

However, since the pH in this case is 3, we need to take into account the fact that the concentration of H+ ions has decreased by a factor of 1000 (from 1 M to 1 mM). Therefore, the Debye length in this scenario would be approximately 3.16 nm.

It's worth noting that this calculation assumes that the solution is ideal, meaning that the ions are perfectly spherical and non-interacting. In reality, ion-ion interactions and ion-solvent interactions can affect the Debye length, especially at high concentrations.

Additionally, other ions present in the solution (such as Cl- from the HCl added) can also contribute to the Debye length calculation

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Answer:

When gamma rays pass through the human body, they ionize the tissue.  gamma ray ionization can affect healthy cells. When high levels of gamma rays bombard a body, a resulting dangerous ionization of tissue can cause skin cancer.

Explanation:

There is an equation sheet for AP Physics. The equation sheet is a reference sheet provided by College Board (the organization that administers the AP Physics exam) that contains a list of commonly used equations and formulas that students are expected to know and use in the exam. The use of this equation sheet can greatly help students in solving the problems they encounter during the exam.

In AP Physics, the equation sheet is an essential tool for students to have with them during the exam. The sheet contains a list of equations and formulas that students will need to apply in order to solve the problems they will face in the exam. This can include equations related to motion, energy, forces, and many other topics that are covered in AP Physics.

In conclusion, the equation sheet for AP Physics is a valuable resource for students taking the exam. It provides a comprehensive list of the equations and formulas that are commonly used in the exam, and helps students to better understand the concepts covered in the course. By preparing and using the equation sheet, students can increase their chances of success in the AP Physics exam.

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Answer:

D

Explanation:

light moves in a straight line (sorry if I'm wrong)

If a  student wants to draw a diagram to show the path of a light wave would be an arrow starting at the wave source and pointing away from it , therefore the correct answer is option D.

Science is the methodical, empirically-based pursuit and application of knowledge and understanding of the natural and social worlds.

A method of learning about the world is science. Science allows people to participate in the creation of new knowledge as well as use that knowledge to further their goals.

If a  student wants to draw a diagram to show the path of a light wave would be an arrow starting at the wave source and pointing away from it, therefore the correct answer is option D.

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Answer:

so if it's 20 you should put 20 times 10 15 * 30 and 1.3 * 5 mg and if you put that milligrams in there it'll solve the destination I saw the white way you going so yeah just be careful at least you want to make the milligrams even a multimacy with the y i and replace it with the 14a

Answer:

Technician B only is correct

Explanation:

The gear ratio is the ratio of the output speed to the input speed such that an overdrive gear ratio of more than 1:1, having more speed per speed of engine rotation RPM

Overdrive ratios conditions is one where the vehicle wheels and speed is faster at a given engine rotation, such that there is fuel efficiency is increased as the engine rotation is low for a given speed and distance of travel.

Motion is a change in position measured by distance and time.

Answer:

Kinetic energy waves

Explanation:

the kinetic energy moves from your hand into the glass, knocking it over.

The prove of  Angle XYZ- Angle NYM is given below:

Note that from the image given;

Since ∠XYZ is said to be congruent to ∠NYM it can be proven by the use of the reflexive property.

The reflexive property is one that informs that any shape is regarded congruent to itself.

Since ∠NYM has a different way to call ∠XYZ that uses a different vertexes, but the sides are made up of the two angles which are said to be the same.

Therefore , ∠XYZ ≡ ∠NYM are proved by the reflexive property.

Since ΔXYZ is the same with Δ NYM, it can be proven by the AA (angle-angle) similarity theorem.

We have 2 angles Δ XYZ and Δ NYM:

Note that ∠YXZ ≡ ∠YNM

              ∠XYZ ≡ ∠NYM

So,  ΔXYZ is said to be the same to ΔNYM and it is proven by the AA similarity theorem.

Therefore, The prove of  Angle XYZ- Angle NYM is given below:

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Answer:

1. parrael

2. corresponding angles theorem

3. NYM

4. AA

Explanation:

just took it

In contrast to steam-powered trains, maglev trains move forward using a different method. Maglev trains use magnets to lift the train above the tracks rather of burning coal to produce steam.

The Maglev is based on magnetic levitation, as opposed to regular trains, which have wheels. The train is raised briefly above the tracks by electromagnets. The thrust that propels the train is also produced by these magnets.

The primary draw of maglev trains is their speed, which is far greater than that of conventional rail trains. The Shanghai Maglev, the only commercial high-speed maglev, is currently the fastest train in use. Almost 50 mph (80 kph) quicker than the quickest high-speed vehicle

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