Which quantities appear in the equation for the magnetic field component of an electromagnetic wave?

i belive the answer is B

Resistors 'C' and 'D' are in series.  There's only one possible route for current to flow through them.  Every electron that flows through one of them has to flow through the other one.  So the current (amount of charge per second) must be the same in 'C' and 'D'. (answer-choice B)

Correct Answer is D.

The other answers do not make sense. Imagine this. You break a magnet in half. All it does is become a smaller magnet.

You are working with a magnet and it breaks in half. You then end up with  two magnets, each with a south and a north pole (D).

A) Upward

In order to find the direction of the magnetic force on the wire, we can use the right-hand rule: the index finger, the middle finger and the thumb of the right hand must be placed all of them perpendicular to each other.

So we have:

- Index finger: direction of current in the wire (from west to east)

- Middle finger: direction of magnetic field (from south to north)

- Thumb: direction of the force --> so it will be upward

So, the force will point upward.

B) [tex]1.82\cdot 10^{-4}N[/tex]

The magnitude of the force exerted by the magnetic field on the wire is given by

[tex]F=ILB[/tex]

where

I = 1.50 A is the current in the wire

L = 2.20 m is the length of the wire

[tex]B=0.550 G = 0.55 \cdot 10^{-4}T[/tex]

Substituting into the equation, we find

[tex]F=(1.50 A)(2.20 m)(0.55 \cdot 10^{-4} T)=1.82\cdot 10^{-4}N[/tex]

Final answer:

The force exerted by the Earth's magnetic field on a wire carrying current from west to east is directed upwards. To determine the magnitude of the force, use the formula F = I × L × B × sin(θ) and calculate it to be approximately 0.1815 mN, where I represents current, L length, and B magnetic field.

Explanation:

The student's question involves finding the direction and magnitude of the force exerted by the Earth's magnetic field on a current-carrying wire oriented from west to east. To solve this, we use the right-hand rule for the direction and the formula F = I × L × B × sin(θ) for the magnitude.

Force Direction

Part A asks for the direction of the force. We apply the right-hand rule which indicates that if you point your thumb in the direction of current (from west to east, which is left to right) and your fingers in the direction of the magnetic field (from south to north, or bottom to top), your palm will face towards the direction of the force exerted on the wire. As the current flows from west to east and the Earth's magnetic field goes from south to north, the force on the wire will be directed upwards.

Force Magnitude

Part B asks for the magnitude of the force. The formula we use is F = I × L × B × sin(θ), where F is the force, I is the current (1.50 A), L is the length of the wire (2.20 m), B is the magnetic field, which should be converted from gauss to tesla (1 gauss = 1×10⁻⁴ tesla, so 0.550 gauss = 5.50×10⁻⁵ T), and θ is the angle between the wire and the magnetic field (90° here). With these values, we can calculate the force.

Let's calculate the force:
F = 1.50 A × 2.20 m × 5.50 × 10⁻⁵T × sin(90°)
F = 1.50 × 2.20 × 5.50 × 10⁻⁵ N
F = 0.1815 × 10⁻³ N
F ≈ 0.1815 mN

Answer:

An element may have several isotopes that contain different numbers of NEUTRONS but the same number of PROTONS.

Explanation:

Isotopes are defined as the group of such atoms which will have same number of protons but different number of neutrons

So this is basically same atoms but with different number of neutrons

So here we can sat

[tex]_1^1H , _1^2H , _1^3H[/tex]

above are three isotopes of hydrogen

similarly we have many more examples of isotopes in which the atoms are of same type but with different number of neutrons

so here correct answer will be

An element may have several isotopes that contain different numbers of NEUTRONS but the same number of PROTONS.

Final answer:

Isotopes of an element differ in the number of neutrons they have but have the same number of protons. Answer B) neutrons, protons, is correct for the given question on the nature of isotopes.

Explanation:

An element may have several isotopes that contain different numbers of neutrons but the same number of protons. The correct answer to the question is B) neutrons, protons.

Isotopes are variants of a particular chemical element, which while having the same number of protons, differ in the number of neutrons they possess. Thus, isotopes of an element have identical atomic numbers (representing the number of protons) but different mass numbers (representing the total number of protons and neutrons). This variation in the number of neutrons does not affect the chemical properties of an element, as these properties are primarily determined by the number of protons and electrons, which are the same in all isotopes of an element.

answer:

heating the material

placing the material in a magnetic field of opposite polarity

hitting the material

Answer: heating, placing in a strong magnetic field, Placing in an electric field.

Explanation: Placing the material in an electric field.

Heating the material. Raising the temperature of the material.

Place the material in a magnetic field that is basically of opposite polarity.

Physically hitting of the material.

Opaque materials absorb all the light that shines on them.  None of it comes out the other side.  That's why they're opaque.

Opaque materials become warmer when light shines on them, because they absorb the energy carried by the light that shines on them.  (According to the law of Conservation of Energy, that energy has gotta go somewhere.)

Opaque materials become warmer when light shines on them due to the absorption of light energy by the atoms and molecules of the material.

Opaque materials become warmer when light shines on them due to the absorption of light energy. When light hits an opaque material, the photons from the light wave interact with the atoms and molecules of the material. These interactions cause the atoms and molecules to vibrate, generating heat energy and resulting in an increase in temperature.

For example, when sunlight shines on a black, opaque surface, the surface absorbs most of the light energy. The absorbed energy causes the atoms and molecules of the surface to vibrate, leading to an increase in temperature.

In contrast, transparent materials, such as glass, allow light to pass through them without significant absorption. As a result, they do not become as warm when light shines on them.

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The Soviet Union's Sputnik 1, it was launched October 4th 1957.

Answer:

The temperature and volume of a gas are directly proportional when pressure is constant.

Explanation:

Charles's Law was proposed by a French chemist, Jacques Charles. The law states that "The volume of a fixed mass of a gas varies directly as its absolute temperature if the pressure is constant".

The law shows the relationship between volume and temperature at a constant temperature. It is mathematically expressed as:

                             V∝T(P,n constant)

Answer: it’s A for e2020

Explanation:

Just took the test

Answer: The answer is A

Explanation:

Electronegativity is the ability to attract electrons. The periodic trend for electronegativity increases up a column and from left to right along a row. Which means that main group metals have low electronegativity and the transition metals have low to medium electronegativity and a small number of valence electrons. Which then leads the metals to not hold on to their valence electrons very tightly and to lose them easily forming cations.  So low electronegativity means high metallic character.

Answer:

scissors

Explanation:

Answer:

Let's first remember what a lever is used for... it allows one to magnify the amount of force being applied to something, via a stiff arm. Now let's go through a process of elimination.

Light switch: Yes there's a stiff arm. And although you're not doing much work turning a light on and off, the switch does magnify the force you apply to the mechanism hidden behind the wallplate. We'll call it a lever.

Knife: Acting as a wedge to force two halves a whole apart. However, it can be used as a lever too. Pushing a knife onto something doesn't always cut it right away. Sometimes, you have to put the point down and then apply force to the handle, using whatever you're cutting as fulcrum. Ultimately a wedge, but still acting as a lever.

Broom: Are you on your knees sweeping with a toothbrush, which takes a lot of work, or are you holding a broom handle in two hands, moving one and using the other as a fulcrum? Thought so. Still a lever.

Scissors: Like the knife, they act as a wedge, cutting through thin materials. However, the cutting point is right at the fulcrum of the scissors! You're not magnifying any force there. So I would say no, scissors are not an example of a lever.

Explanation:

a. 0.5 T

- The amplitude A of a simple harmonic motion is the maximum displacement of the system with respect to the equilibrium position

- The period T is the time the system takes to complete one oscillation

During a full time period T, the mass on the spring oscillates back and forth, returning to its original position. This means that the total distance covered by the mass during a period T is 4 times the amplitude (4A), because the amplitude is just half the distance between the maximum and the minimum position, and during a time period the mass goes from the maximum to the minimum, and then back to the maximum.

So, the time t that the mass takes to move through a distance of 2 A can be found by using the proportion

[tex]1 T : 4 A = t : 2 A[/tex]

and solving for t we find

[tex]t=\frac{(1T)(2 A)}{4A}=0.5 T[/tex]

b. 1.25T

Now we want to know the time t that the mass takes to move through a total distance of 5 A. SInce we know that

- the mass takes a time of 1 T to cover a distance of 4A

we can set the following proportion:

[tex]1 T : 4 A = t : 5 A[/tex]

And by solving for t, we find

[tex]t=\frac{(1T)(5 A)}{4A}=\frac{5}{4} T=1.25 T[/tex]

The time it takes for the mass to move through a distance of 2A is 2 times the period T, and the time it takes for the mass to move through a distance of 5A is 5 times the period T.

In terms of T, the time it takes for the mass to move through a total distance of 2A is:

t/T = 2

The time it takes for the mass to move through a total distance of 5A is:

t/T = 5

These equations show that the time it takes for the mass to move through a total distance is proportional to the number of times the amplitude is covered. Therefore, if the distance is 2A or 5A, it will take 2 or 5 times the period T, respectively.

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Answer:

521 nm

Explanation:

Given the values and units we are given, I'm assuming  5.76*10^14 Hz is frequency.

The formula to use here is λ * υ = c, where λ is wavelength, υ is frequency, and c is the speed of light.

λ = [tex]\frac{3*10^8\frac{m}{s} }{5.76*10^{14}Hz} = {5.20833*10^{-7} m}\approx{521 *10^{-9}m}={521 nm}[/tex]

Answer:

The first flowering plants appeared in the Mesozoic era, not the Paleozoic era

Explanation:

The Mesozoic era is well known and most famous because of the rule of the dinosaurs which were the dominant animals for most of this are. Also, it is the era in which the mammals appeared, though they lived in the shadows of the dinosaurs and only became dominant after their extinction. Another important evolution that took place and is not mentioned very often is the appearance of the first flowering plants. This was a revolutionary trait for the plants, and it helped them to survive in the changing climate on Earth. Soon this trait enabled this type of plants to spread out significantly and to become one of the most dominant organisms on the planet in the following era.

The answer is through light.

Light is unique it carries information it has no mass and it is insanely fast.

But what is light?

You can imagine it as a stream of photons (elementary particles) traveling from its source to surface of an object with a speed of light where they bounce of your eye. That very moment the information of a single photon in a form of energy is transmitted to your eyes and later on to your brain which processes the gathered information and constructs an image.

When you turn on the light you know that all the photons are coming from it the same thing is with nonanthropogenic light (natural light) we get about 99% from the sun and about 1% from the moon at night.

In the core of our sun elements are fused to make up heavier elements in this process energy is released (E=mc^2, where E is energy, m mass of a single atom fused inside star and c^2 the square of speed of light) in a form of photons and the type of photon (its frequency) determines if it will be visible to our eye and also determines the type of luminosity of stars.

Also if you were to track every single bit of information carried by any photon any time you would unravel the unfolding of the universe from the big bang to today.

Answer:

A. It passes wthout any deviation

Explanation:

In real lenses the light does not go straight through, there is a refraction. But we can assume that that it passes without any deviation because the center of a lens is comparatively flat that the other points of the lens.

Answer:

A.  It passes without any deviation.

Explanation:

For making ray diagram, following rules are followed:

Thus, the correct option is A.

Answer:

= 2.83

Explanation:

F number (N) is given by the formula;

  F- number = f/D

where f = focal length of lens and D = diameter of the aperture  

Therefore;

F number = 17 cm/6 cm

                = 2.83

The number of the television camera lens with focal length 17 cm and lens diameter 6.0 meter is 2.83.

The focal length of the lens is the length of the distance between the middle of the lens to the focal point.

It can be find out using the following formula as,

[tex]f=d\times n[/tex]

Here, (c)is the diameter the lens and, (n) is the number of the lens. This formula can be written as,

[tex]n=\dfrac{f}{d}[/tex]

The television camera lens has a 17-cm focal length and a lens diameter of 6.0 cm. Thus put this values in the above formula as,

[tex]n=\dfrac{17}{6}\\n=2.83[/tex]

Thus, the number of the television camera lens with focal length 17 cm and lens diameter 6.0 meter is 2.83.

Learn more about the focal length here;

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Answer:jyjyjjhjh

Explanation:

hjjhjhjhjjh

Answer:

28.8 %

Explanation:

The efficiency of an engine is given by:

[tex]\eta = \frac{W}{Q_{in}}[/tex]

where

W is the useful work done

[tex]Q_in[/tex] is the heat in input

For this machine, we have

W = 15.0 kJ is the work done

[tex]37.0 kJ[/tex] is the heat exchausted to the cold reservoir, so the total amount of heat in input is

[tex]Q_{in} = 15.0 kJ + 37.0 kJ=52.0 kJ[/tex]

And so the efficiency is

[tex]\eta=\frac{15.0 kJ}{52.0 kJ}=0.288[/tex]

which corresponds to 28.8 %.

The efficiency of an engine is calculated by dividing the work output by the total energy input. In this case, the engine has an efficiency of 28.8%.

The efficiency of an engine can be calculated by the ratio of the work output to the heat input. In this case, the work output done by the engine is 15.0 kJ, and the heat input is the total energy supplied to the engine which is the sum of the work done (15.0 kJ) and the energy exhausted to the cold reservoir (37.0 kJ), giving a total of 52.0 kJ. Thus, the efficiency of the engine can be found by dividing the work done by the total energy supplied, or (15.0 kJ)/(52.0 kJ) = 0.288, or 28.8%.

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1. the change in position of an object from start to finish, a vector quantity . . . . . displacement

2. a portion of space that contains a value for a measurable quantity at every point in space . . . . . field

3. speed = (distance) / (time to cover the distance)

4. the length of the entire path an object travels from start to finish . . . . . distance

5. a measurement that has both magnitude and direction . . . . . vector

6. a change in displacement with respect to time . . . . . velocity

7. a mental or physical construct or description that describes a physical phenomenon . . . . . model

8. a change in velocity with respect to time . . . . . acceleration

9. a measurement that only expresses magnitude, such as time, temperature, distance, and speed . . . . . scalar

10. objects that are thrown or launched in the air and are subject to gravity . . . . . projectile

Here we want to complete different statements about dynamics, the solutions are:

So most of these are just definitions, so not a lot can be told about some of the answers, but I will try to develop each one as I can.

1) "the change in position of an object from start to finish, a vector quantity model"

By definition, this is the displacement, the change in between the final and initial position.

2) "a portion of space that contains a value for a measurable quantity at every point in space"

This is a field, it refers to the measure of something (magnetic field, electric field, etc) in a given position in space.

3) "speed = distance/time"

Speed is defined as the quotient between the distance traveled and the time it takes to travel that distance.

4) "the length of the entire path an object travels from start to finish projectile"

This is defined as the "travel distance"

5) "a measurement that has both magnitude and direction"

A vector is a measurement with both magnitude and direction.

6) "a change in displacement with respect to time"

A change in the displacement with respect to time is the velocity, it comes from point 3.

7) "a mental or physical construct or description that describes a physical phenomenon"

This is a model, is just an explanation of a given phenomenon

8) "a change in velocity with respect to time"

The rate of change of velocity with respect to time is the acceleration.

9) "a measurement that only expresses magnitude, such as time, temperature, distance, and speed"

This is a scalar, is a measurement that only has magnitude, not direction.

10) "objects that are thrown or launched in the air and are subject to gravity"

This is a projectile, or more exactly, a free-falling object, if we only look at the vertical problem.

If you want to learn more about dynamics, you can read:

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Answer:

C) directed toward the center of the circle.

Explanation:

An object undergoing uniform circular motion is an object that is moving at constant speed along a circular trajectory.

According to Newton's Laws, in order to keep the object in circular motion, there must be a net force that keeps changing the object's direction (otherwise, the object would just move in a straight path due to its inertia).

This force is called centripetal force, and it always points towards the centre of the circular path. Its magnitude is given by

[tex]F=m\frac{v^2}{r}[/tex]

where

m is the mass of the object

v is the speed

r is the distance of the object from the centre of the trajectory

Answer:

C) directed toward the center of the circle.

Explanation:

Whenever an object undergoes uniform circular motion, it experiences a net force directed toward the center of the circle. The magnitude of this force is represented by the formula [[m[tex]v^{2}[/tex]/r]].

Answer:

Explanation:

This statement is subjective, because it refers to personal issues, which are from subjects. Remember that objective refers to the objects as they are, with no personal opinions, and subjective refers to the subjects, includes their opinion or personal stuff about.

D: the two people are talking about a time when they were younger and ate a picnic lunch under a tree with friends from school is an example of nonobjective statement about a picture that shows two people talking while standing under a tree on a sunny day

Longing for or thinking fondly of a past time or condition is called being nostalgic

A:the two people are standing under a tree on a sunny day

B: the two people are standing under a tree

C:the two people are talking together on a Sunny day

In all above three statements there is no significance of a picture but in option D: the two people are talking about a time when they were younger and ate a picnic lunch under a tree with friends from school in this statement we can see that there is significance of people where they are talking under a tree about when they were in school that means they must be looking at an old school photograph and feeling nostalgic by remembering old days

hence correct option  D: the two people are talking about a time when they were younger and ate a picnic lunch under a tree with friends from school

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Answer:

0.23 s

Explanation:

First of all, let's find the time constant of the circuit:

[tex]\tau=RC[/tex]

where

[tex]R=50,000 \Omega[/tex] is the resistance

[tex]C=2.0\mu F=2.0\cdot 10^{-6}F[/tex] is the capacitance

Substituting,

[tex]\tau=(50,000 \Omega)(2.0\cdot 10^{-6}F)=0.1 s[/tex]

The charge on a charging capacitor is given by

[tex]Q(t)=Q_0 (1-e^{-t/\tau} )[/tex] (1)

where

[tex]Q_0[/tex] is the full charge

we want to find the time t at which the capacitor reaches 90% of the full charge, so the time t at which

[tex]Q(t)=0.90 Q_0[/tex]

Substituting this into eq.(1) we find

[tex]0.90 Q_0 = Q_0 (1-e^{-t/\tau})\\0.90=1-e^{-t/\tau}\\e^{-t/\tau}=1-0.90=0.10\\-\frac{t}{\tau}=ln(0.10)\\t=-\tau ln(0.10)=(0.1 s)ln(0.10)=0.23 s[/tex]

The time it takes for the capacitor to reach 90% of full charge is approximately 0.23 seconds.

To calculate the time it takes for the capacitor to reach 90% of full charge, we need to use the time constant equation, which is given by t = RC. In this case, the resistance is 50,000 ohms and the capacitance is 2.0 µF. Multiplying these values gives us a time constant of 0.1 seconds.

To find the time it takes for the capacitor to reach 90% of full charge, we multiply the time constant by 2.3, which is the natural logarithm of 0.9. So the time it takes for the capacitor to reach 90% of full charge is approximately 0.23 seconds.

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Piano tuners use frequency differences and beat frequencies to tune pianos.

(a) The frequency of the third harmonic of A can be calculated by multiplying the fundamental frequency of A (440 Hz) by 3, resulting in a frequency of 1320 Hz. The frequency of the second harmonic of E can be calculated by multiplying the fundamental frequency of E (659 Hz) by 2, which is 1318 Hz. To find the frequency difference between the two, subtract the second harmonic of E from the third harmonic of A: 1320 Hz - 1318 Hz = 2 Hz.

(b) When the tuner strikes the A and E strings simultaneously, she listens for beats between the harmonics. The beat frequency indicates that the E string is properly tuned. The beat frequency is equal to the difference between the frequencies of the harmonics. In this case, the beat frequency would be 2 Hz.

(c) When the tuner hears four beats per second, it means there is a beat frequency of 4 Hz between the harmonics. To find the frequency of the E string, we can use the formula: Beat Frequency = Frequency of Higher Harmonic - Frequency of Lower Harmonic. Rearranging the formula, we get: Frequency of Higher Harmonic = Beat Frequency + Frequency of Lower Harmonic. Plugging in the values, we get: Frequency of Higher Harmonic = 4 Hz + 659 Hz = 663 Hz.

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The following symbol is used to represent cell (batery) in a circuit diagram.

D is correct

+ - is battery

you got right

Answer:

Layer C

Explanation:

The Principle of faunal succession also is the study of fossils

Their for making the answer A

1. 686 nm

The lowest photon energy is

[tex]E=1.8 eV[/tex]

Let's convert this energy into Joules first

[tex]E=(1.8 eV)(1.6\cdot 10^{-19} J/eV)=2.9\cdot 10^{-19} J[/tex]

The energy of the photon is given by

[tex]E=\frac{hc}{\lambda}[/tex]

where

h is the Planck constant

c is the speed of light

[tex]\lambda[/tex] is the wavelength

Re-arranging the equation for [tex]\lambda[/tex], we find the maximum wavelength of the photon that can cause a transition:

[tex]\lambda=\frac{hc}{E}=\frac{(6.63\cdot 10^{-34}Js)(3\cdot 10^8 m/s)}{2.9\cdot 10^{-19} J}=6.86\cdot 10^{-7}m=686 nm[/tex]

2. Visible light

The photon of this light is in the visible light part of the spectrum.

In fact, the range of wavelengths of the visible part of the spectrum is

[380 nm - 750 nm]

In particular, we have that the wavelengths in the range

[640 nm - 750 nm]

corresponds to the red light part of the spectrum: since 686 nm falls withing this range, this photon is a red light photon.

The maximum wavelength of electromagnetic radiation that can cause a transition in rhodopsin is approximately 389 nm, which lies in the visible light part of the spectrum.

The maximum wavelength of electromagnetic radiation that can cause a transition in rhodopsin can be calculated using the equation E = hc/λ, where E is the energy of the photon, h is Planck's constant, c is the speed of light, and λ is the wavelength of the radiation. Rearranging the equation to solve for λ, we have λ = hc/E. Plugging in the given values, we get λ = (6.626 x 10^-34 J · s x 3 x 10^8 m/s)/(1.8 x 1.602 x 10^-19 J) ≈ 389 nm.

This wavelength lies in the visible light part of the spectrum. Visible light ranges from approximately 400 to 700 nm, with shorter wavelengths corresponding to violet light and longer wavelengths corresponding to red light.

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The location of the center of our Galaxy was first determined by observations of Globular Clusters

Answer:

Nuclear reaction

Hope this helps! =)

Explanation:

Explanation:

A chemical reaction is defined as the reaction that involves exchange of electrons between the reacting atoms.

For example, [tex]2Na(s) + Cl_{2}(g) \rightarrow 2NaCl[/tex]

Mass of Na = 23 g/mol

Mass of Cl = 35 g/mol

Mass of NaCl compound = (23 + 35) g/mol = 58 g/mol

So, in chemical reactions law of conservation of mass is obeyed because mass of reacting species is changing from one form to another.

Whereas in nuclear reactions there is splitting or combining of atomic nuclei of atom(s). Since, nuclei is involved in nuclear reaction so more energy is required.

Also, E = [tex]mc^{2}[/tex] so, in nuclear reactions mass of reacting atoms changes into energy. This results in formation of larger amount of energy.

Therefore, we can conclude that in situations involving equal masses, chemical reactions produce less energy than nuclear reactions.

Answer:

[tex]4.8\cdot 10^{-21} N[/tex]

Explanation:

The force exerted by a magnetic field on a charged particle is given by

[tex]F=qvB[/tex]

where

q is the charge of the particle

v is the speed

B is the magnetic field strength

In this problem we have:

[tex]B = 0.20 T[/tex] is the strength of the magnetic field

[tex]v = 15 cm/s = 0.15 m/s[/tex] is the velocity

[tex]q=e = 1.6\cdot 10^{-19}C[/tex] is the magnitude of the charge of a single chlorine ion

Substituting into the equation,

[tex]F=(1.6\cdot 10^{-19} C)(0.15 m/s)(0.20 T)=4.8\cdot 10^{-21} N[/tex]

The force felt by a chlorine ion with a single negative charge flowing through a coronary artery under a magnetic field of 0.20 T can be calculated using the Lorentz force law. Given that the velocity of the blood flow is 15 cm/s, the calculated force is -4.8 * 10^-21 N. The negative sign indicates that the force acts in the direction opposite to the magnetic field.

In Physics, the force exerted by a magnetic field on a charged particle like a chlorine ion is given by the Lorentz force law, which states F = qvBsinθ. In this equation, 'F' is the magnetic force, 'q' is the charge of the particle, 'v' is the velocity of the particle, 'B' is the magnetic field strength, and 'θ' is the angle between the velocity and magnetic field vectors.

In your case, the chlorine ion has a single negative charge (q = -1.6 * 10^-19 C), the velocity of the blood flow is given as 15 cm/s (convert this to m/s by multiplying by 0.01 to give v = 0.15 m/s), and the magnetic field strength is 0.20 T. Assuming the flow of blood is perpendicular to the magnetic field, the angle θ = 90° so sinθ = 1.

Substituting these values into the Lorentz force equation gives F = (-1.6 * 10^-19 C) * (0.15 m/s) * (0.20 T) * 1 = -4.8 * 10^-21 N. The negative sign indicates the force acts opposite to the direction of the magnetic field.

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Answer:

The answer to your question is

Explanation:

Data

mass = 0.5kg

T1 = 35

T2 = ?

Q = - 6.3 x 10⁴ J  = - 63000 J

Cp = 4184 J / kg°C

Formula

                        Q = mCp(T2 - T1)

                         T2 = T1 + Q/mCp    

Substitution

                       T2 = 35 - 63000/(0.5 x 4184)

                        T2 = 35 - 63000/2092

                        T2 = 35 - 30.1

                         T2 = 4.9 °C

The initial temperature of the water is 35 degrees then The final temperature of the water will be equal to 4.9 °C.

Specific heat is the amount of energy needed to raise a product's temperature by one degree Celsius per gram. Traditionally, the units of heat capacity are calories or joules per gram per degree Celsius. The specific heat of water, for instance, is 1 calorie (or 4.186 joules) per gram per degree Celsius.

As per the given data in the question,

mass, m = 0.5 kg

Temperature, T₁ = 35

Q = - 6.3 x 10⁴ J  

Q = - 63000 J

Cp = 4184 J / kg°C

Use the equation given below,

Q = mCp(T₂ - T₁)

T₂ = T₁ + Q/mCp    

Substitute values.

T₂ = 35 - 63000/(0.5 x 4184)

T₂ = 35 - 63000/2092

T₂ = 35 - 30.1

T2 = 4.9 °C

Therefore, the final temperature is 4.9 °C.

To know more about Specific Heat:

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