To increase the power factor to 1.0 in a motor circuit, a capacitor should be added. The capacitance value of the capacitor can be calculated by knowing the real and apparent power of the motor circuit before and after the capacitor addition. The introduction of the capacitor provides reactive power that neutralizes the inductiveness of the motor coil, making the circuit purely resistive.
Explanation:The subject matter pertains to understanding power factor, power dissipation and the effects of adding capacitance in a motor circuit. Now, the question mentions that the motor draws 8.40 A current at 120 V giving us a power apparent = V*I = 120 * 8.40 VA. However, the average power dissipated (Real power, P) is 850 W. The power factor is the ratio of real power to apparent power. However, to achieve a power factor of 1 (i.e., make the circuit purely resistive), we must add a capacitor (reactive power component) that will counteract the inductiveness of the motor coil.
The power factor before the capacitor is added is P/S = 850/(120*8.4) = 0.84. The reactive power Q before the capacitor is added can be calculated by the formula Q = sqrt[(S^2)-(P^2)] = sqrt[((120*8.4)^2)-(850^2)] VAR. After the capacitor is added, the power factor is 1 (as per the question), which means the reactive power Q' = 0. Therefore, reactive power supplied by the capacitor C = Q - Q' = Q = sqrt[((120*8.4)^2)-(850^2)].
Using Q = sqrt[(S^2)-(P^2)], we can find the current supplied by the capacitor as Ic = Q/V. From this current, we can find the capacitance using the formula C = Ic / (2*π*f.*V) where f = frequency = 60 Hz.
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To improve the power factor of a 120 V motor that draws 8.40 A to unity, we need to add a 94.6 µF series capacitance. This helps cancel out the reactive power, thereby achieving a power factor of 1.0.
Calculating Series Capacitance to Improve Power Factor
To increase the power factor to 1.0 for a motor attached to a 120 V/60 Hz power line that draws an 8.40 A current and has an average energy dissipation of 850 W, follow these steps:
Step 1: Calculate Apparent Power (S)
we know , Apparent power S = V * I
Where:
V = 120 V
I = 8.40 A
So,
S = 120 V * 8.40 A = 1008 VA
Step 2: Calculate the Current Power Factor (pf)
The power factor is the ratio of real power (P) to apparent power (S). Therefore:
pf = P / S = 850 W / 1008 VA ≈ 0.843
Step 3: Calculate the Reactive Power (Q)
Reactive power can be determined using the Pythagorean theorem for the power triangle:
Q = √(S² - P²)
So,
Q = √(1008² - 850²) ≈ 512 VAR
Step 4: Calculate Required Capacitive Reactance (Xc)
For unity power factor, the reactive power provided by the capacitor should cancel out the Q value:
Xc = V² / Q
So,
Xc = 120² / 512 ≈ 28.125 ohms
Step 5: Calculate Series Capacitance (C)
Use the formula for capacitive reactance:
Xc = 1 / (2πfC)
Solve for C:
C = 1 / (2π * 60 Hz * 28.125 ohms) ≈ 94.6 µF
Adding a series capacitance of approximately 94.6 µF will increase the power factor to 1.0.
Will the sun ever explode as a type i supernova?
Answer:
Yes.
Explanation:
A 70 kg person running at 4 m/s what is the kinetic energy
Let:
m = mass (kg)
v = velocity (m/s)
KE = 0.5m(v^2)
KE = 0.5(70)(4^2)
KE = 560 Joules.
The kinetic energy of a 70 kg person running at 4 m/s, calculated using the formula KE = 0.5 * m * v^2, is 560 Joules.
Explanation:The kinetic energy of a body can be calculated using the formula KE = 0.5 * m * v^2, where KE represents kinetic energy, m represents mass, and v represents velocity. In this case, we have a person with a mass of 70 kg who is running at a speed of 4 m/s. Substituting these values into the formula yields: KE = 0.5 * 70 kg * (4 m/s)^2 = 560 Joules. Hence, the kinetic energy of the person running at 4 m/s is 560 Joules.
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Which one of the following statements concerning spherical mirrors is correct?A. Only a convex mirror can produce an enlarged image.
B. Both concave and convex mirrors can produce an enlarged image.
C. Only a concave mirror can produce an enlarged image, provided the object distance is less than the radius of curvature.
D. Only a concave mirror can produce an enlarged image, provided the object distance is greater than teh radius of hte curvature.
C bc read the question
Only a concave mirror can produce an enlarged image, provided the object distance is less than the radius of curvature is correct about spherical mirrors.
What are the characteristics of spherical mirrors?A spherical mirror is a mirror whose reflecting surface is part of a hollow sphere of glass. The spherical mirrors are of two types: concave mirrors and convex mirrors.
A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex or concave. Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices.
Some applications of convex mirror are sunglasses, rear view mirrors, shaving mirror,etc. Some applications of concave mirrors are reflectors, converging of light, solar cooker etc.
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t is correct to say that impulse is equal toA) momentum.B) the change in momentum.C) the force multiplied by the distance the force acts.D) all of these.E) none of these.
B is the correct answer
Hope this helps:)
Tiffany kicks a soccer ball off the ground and in the air, with an initial velocity of 28 feet per second. Using the formula H(t) = −16t2 + vt + s, what is the maximum height the soccer ball reaches?15.6 feet14.1 feet13.5 feet12.3 feet
Answer:
The maximum height of soccer ball is 12.25 ft.
Explanation:
You know: H(t) = −16t² + vt + s
First you must know the value of the constant "s". For this you know that at the beginning, at time t = 0, the initial height H (0) is zero. Also, you know that the speed v is 28 feet per second. So:
H(0)=-16*0² + 28*0 + s
0=-16*0² + 28*0 + s
0=s
Then, the speed expression is determined as:
H(t) = −16t² + 28*t
The vertex is a point that is part of the parabola, which has the value as ordered minimum or maximum function. At that point an imaginary axis can be drawn that makes symmetric the graph of the function, which is called the axis of symmetry.
Being the parabola: f(x)=a*x² + b*x + c
the vertex is calculated as: [tex](x,y)=(\frac{-b}{2*a} ,f(\frac{-b}{2*a}))[/tex]
In this case, the point "x" of the vertex indicates the time at which the soccer ball reaches the maximum "y" height ( The vertex is at a maximum point of the function.) So, being a=-16 and b=28, the vertex is:
[tex]x=\frac{-b}{2*a} =\frac{-28}{2*(-16)}[/tex]
x=0.875
H(0.875)=-16*(0.875)²+28*(0.875)=12.25
The maximum height of soccer ball is 12.25 ft.
This is the sum of all the forces applied to an object. It is usually separated into a horizontal and vertical component.
Answer: Net Force, also is referred to as Resultant Force
Answer: The force is resultant force
Explanation:
The sum of all the forces applied to an object which usually separated into a horizontal and vertical component is its "resultant". This resultant force is a single force that act in terms of all other forces acting on an object or body combined together. It is always opposite the equilibrant in a system of forces.
A cyclist rides her bike 7 mi east, and then 2 mi north before taking a break. Then she rides 5 mi east and then 3 mi north. What are the magnitude and direction of the cyclist’s resultant displacement?
magnitude: 10.9 mi; direction: 22.6° north of east
magnitude: 10.9 mi; direction: 67.4° north of east
magnitude: 13.0 mi; direction: 67.4° north of east
magnitude: 13.0 mi; direction: 22.6° north of east
Answer:
D 13.0mi, dir 22.6° north of east
Explanation:
Total movement east is 7+5 miles, or 12 miles. Total movement north is 2+3 miles, or 5 miles. The total displacement, as the crow flies, is of [tex]\sqrt{12^2+5^2} =13[/tex]miles. The angle is the inverse tangent of north/east, or [tex]tan^{-1} \frac 5 {12} =22.62°[/tex]
For which optical devices does f have a negative value?
Answer:
i think d
Explanation:because concave and convex mirrors have f negative value
Answer:
B and D ( c )
Explanation:
The optical devices that have f ( focal length ) as negative is the diverging lens ( image b ) and a convex mirror ( image d ).
An optical device is said to have a negative focal length when the image been focused or viewed on it appears on the same side as with the object been viewed as this is observed when images are viewed through a diverging lens ( image b ) and also when an image is viewed through a convex mirror ( image d ). when an image is viewed through an optical device and the image appears on the opposite side the optical device is a said to have a positive focal length ( f )
the negative f ( focal length ) means that the focal point of the optical device is on the same side of the lens as with where the object is placed
Why do opaque materials become warmer when light shines on them?
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.
Explanation: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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explain why meteorologists compare new weather maps and weather maps that are 24 hours old
To see which way atmospheric conditions and meteorological phenomena are moving, and how fast.
Also to see whether they were correct yesterday.
Answer:
Meteorologists would compare a new weather map with one 24 hours old to see how fast a front is moving because the United States is very large, a large number of station models help give a more complete picture of the weather and make weather forecasts more accurate.
Explanation:
100%
To which layer can geologists apply the principle of faunal succession to determine the age of the layer?
A. Layer C
B. Layer A
C. Layer D
D. Layer B
Answer:
Layer C
Explanation:
The Principle of faunal succession also is the study of fossils
Their for making the answer A
Which choice most accurately describes the method of storing electrical energy in a battery?
A battery can store energy when placed in a circuit. A chemical reaction occurs inside a battery, releasing the energy to push electrons in the circuit.
A battery can store energy when placed in a circuit. Mechanical energy is stored in the battery. This energy is released to push electrons in the circuit.
A battery can store energy when placed in a circuit. A chemical reaction occurs inside a battery, releasing the energy to push protons in the circuit.
A battery can store energy when placed in a circuit. Mechanical energy is stored in the battery. This energy is released to push protons in the circuit.
Final answer:
A battery stores electrical energy via chemical reactions that release electrical energy to move electrons in a circuit when connected.
Explanation:
The most accurate description of how a battery stores electrical energy is through chemical reactions that occur within it when placed in a circuit. These chemical reactions convert chemical potential energy into electrical energy, which is then utilized to move electrons throughout the circuit.
This process increases the potential energy of the electrons, allowing them to do work, such as lighting a bulb or powering a motor. It is important to note that in electrochemical cells, or batteries, electrical energy is generated as a result of a chemical reaction between the reactants, resulting in products with less potential energy than the reactants. When a battery is connected to a circuit, its stored chemical energy is converted into electrical energy to "push" electrons through the circuit.
Sound waves travel fastest through a A) gas. B) liquid. C) solid. D) vacuum.
Sound waves travel faster through solids than they do through gases or liquids. (C) They don't travel through vacuum at all.
Example:
Speed of sound in normal air . . . around 340 m/s
Speed of sound in water . . . around 1,480 m/s
Speed of sound in iron . . . around 5,120 m/s
Electrons in a photoelectric-effect experiment emerge from a copper surface with a maximum kinetic energy of 1.10 eV . What is the wavelength of the light?
The photoelectric effect consists of the emission of electrons (electric current) that occurs when light falls on a metal surface under certain conditions.
If the light is a stream of photons and each of them has energy, this energy is able to pull an electron out of the crystalline lattice of the metal and communicate, in addition, a kinetic energy.
This is what Einstein proposed:
Light behaves like a stream of particles called photons with an energy
[tex]E=h.f[/tex] (1)
So, the energy [tex]E[/tex] of the incident photon must be equal to the sum of the Work function [tex]\Phi[/tex] of the metal and the kinetic energy [tex]K[/tex] of the photoelectron:
[tex]E=\Phi+K[/tex] (2)
Where [tex]\Phi[/tex] is the minimum amount of energy required to induce the photoemission of electrons from the surface of a metal, and its value depends on the metal.
In the case of Copper [tex]\Phi=4.7eV[/tex]
Now, applying equation (2) in this problem:
[tex]E=4.7eV+1.10eV[/tex] (3)
[tex]E=5.8eV[/tex] (4)
Now, substituting (1) in (4):
[tex]h.f=5.8eV[/tex] (5)
Where:
[tex]h=4.136(10)^{-15}eV.s[/tex] is the Planck constant
[tex]f[/tex] is the frequency
Now, the frequency has an inverse relation with the wavelength [tex]\lambda[/tex]:
[tex]f=\frac{c}{\lambda}[/tex] (6)
Where [tex]c=3(10)^{8}m/s[/tex] is the speed of light in vacuum
Substituting (6) in (5):
[tex]\frac{hc}{\lambda}=5.8eV[/tex] (7)
Then finding [tex]\lambda[/tex]:
[tex]\lambda=\frac{hc}{5.8eV } [/tex] (8)
[tex]\lambda=\frac{(4.136(10)^{-15} eV.s)(3(10)^{8}m/s)}{5.8eV }[/tex]
We finally obtain the wavelength:
[tex]\lambda=213^{-9}m=213nm[/tex]
In this example of the photoelectric effect, the maximum kinetic energy of ejected electrons from a copper surface is given. By using this kinetic energy, Planck's constant, and the work function energy for copper, a calculation can be made to determine the frequency of the incident light. From that frequency, another calculation can determine the corresponding wavelength of the light.
Explanation:This question relates to the photoelectric effect in physics. In essence, the photoelectric effect is a process where electrons are ejected from a material when electromagnetic (EM) radiation is incident on it. The process is explained by the energy of photons, which are quanta of EM radiation, interacting with individual electrons.
A key equation in understanding this interaction is E = hf, where E is the energy of the photons, h is Planck's constant, and f is the frequency of the radiation. Now, the maximum kinetic energy (KEmax) of the ejected electrons is given by, KEmax = hf - BE, where BE represents the binding energy or work function of the electron to the copper surface.
Given that the maximum kinetic energy KEmax is 1.10 eV (electron-volts), and knowing that Planck's constant h is approximately 4.136 x 10^-15 eV/s, we can rearrange the equation to solve for the frequency f -> f = (KEmax + BE) / h. We need the work function or binding energy BE for copper, which is typically around 4.7 eV. Plug all the values into the equation to get the frequency f.
Furthermore, frequency f and wavelength λ are related by the equation c = fλ, where c is the speed of light (~3.0 x 10^8 m/s). Rearranging that equation for λ -> λ = c / f provides the setup to solve for the wavelength of the light used in the photoelectric effect experiment with copper.
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Consider a magnetic force acting on an electric charge in a uniform magnetic field. Which of the following statements are true? Check all that apply. The direction of the magnetic force acting on a moving electric charge in a magnetic field is perpendicular to the direction of motion. The direction of the magnetic force acting on a moving charge in a magnetic field is perpendicular to the direction of the magnetic field. A magnetic force is exerted on an electric charge moving through a uniform magnetic field. An electric charge moving parallel to a magnetic field experiences a magnetic force. A magnetic force is exerted on a stationary electric charge in a uniform magnetic field. An electric charge moving perpendicular to a magnetic field experiences a magnetic force.
Answer:
Pushing magma up through the interior of earth
Explanation:
Final answer:
The direction and interaction of a magnetic force on a moving electric charge in a magnetic field.
Explanation:
The statements that are true regarding a magnetic force acting on an electric charge in a uniform magnetic field are:
The direction of the magnetic force acting on a moving electric charge in a magnetic field is perpendicular to the direction of motion.The direction of the magnetic force acting on a moving charge in a magnetic field is perpendicular to the direction of the magnetic field.An electric charge moving through a uniform magnetic field experiences a magnetic force.An electric charge moving parallel to a magnetic field experiences a magnetic force.Therefore, statements 1, 2, 3, and 4 are true.
Red, blue, and green are called a __ __ __ __ __ __ __ primary colors because when they are added together, they form all of the colors of the spectrum.
Answer: Additive
Additive primary colors are blue red and green
Red, blue and green are called Additive primary colors which is known as colours of spectrum.
Explanation:
A set of colors that are joined to produce some useful colors are known as Primary colors. Red, blue and green colors will not be formed by adding or combining other colors. Blue, green and red are called primary colors and these colors can be combined to generate various colors.
When the colors yellow and cyan are added it generates a green shade. When the same yellow color is added with magenta it will generate shades of red. Cyan, Magenta, yellow and Black be used to generate color space.
A light wave travels through air at a speed of 3.0x108 m/s. Green light has a wavelength of about 5.76x1014Hz. What is the wavelength of green light
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]
Which of the following is the law of conservation of momentum?
A. The impulse acting on any object is the change in momentum that it causes.
B. The acceleration of any object is equal to the net force acting on it divided by its mass.
C. In the absence of any external force, the total momentum of a system stays the same.
D. When two objects interact within a closed system, neither one changes its momentum.
In the absence of any external force, the total momentum of a system stays the same is the law of conservation of momentum.
What is the law of conservation of momentum?The law of conservation of momentum state that in an isolated system, the total mass of objects does not change which means that the mass of objects before collision is equal to the total mass after collision.
The formula for law of conservation of momentum is. M1V1 + M2v2 = M1V1 + M2V2
M1 is initial mass of objects
V1 initial velocity of the object.
M2 is final mass
V2 final velocity.
Therefore, In the absence of any external force, the total momentum of a system stays the same is the law of conservation momentum.
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A student found the rock shown above and weighed it to determine its mass. What steps should the student take to find its density?
In order to find the density of the rock, the student should follow the steps highlighted below.
Steps in determining density of a rock
Weigh the rock using a scale to find out how heavy it is in grams. Ensure that the measurement is very precise.
Find out how much space the rock takes up: There are a few ways to figure out how big an irregularly shaped object, like a rock, is. There are two usual ways:
"Use water to measure volume: Pour water into a cylinder and write down how much there is at the start. " Gently put the rock in the water, and make sure there are no air bubbles stuck.
Find out how much water the rock is pushing out of the way now. Subtract the starting volume from the ending volume to find the volume of the rock.
Archimedes' principle: First, weigh the rock in the air. Then, weigh it again when it's completely underwater. The change in weight when a rock is in water is the same as the weight of the water that the rock pushes aside. Find the volume of the rock by dividing its weight by the density of water, which is usually 1 gram per cubic centimeter.
To find the density of a rock, divide its mass (in grams) by its volume (in cubic centimeters or milliliters). Density = Mass / Volume
Density is the amount of mass in a certain amount of space. It is calculated by dividing the amount of mass by the amount of space it takes up.
Ensure that the measurements for mass and volume are the same (like both in grams or both in kilograms, both in cubic centimeters or both in milliliters).
After calculating the density, write it in the right units. Density is usually measured in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).
Suppose that you are standing on a train accelerating at 0.39g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
Static friction is the friction that exist between a stationary object and the surface on which it is resting. Coefficient of friction tells us how strongly the two surfaces grip each other. Static friction and coefficient of friction are related to each other by the relation;
Fs=μsN
where,
Fs=Force of static friction
μs=Coefficient of friction
N=Normal force
Answer:
0.39
Explanation:
In order not to slide, you must have exactly the same acceleration of the train:
[tex]a=0.39 g[/tex]
where
g = 9.81 m/s^2
There is only one force acting on you: the static frictional force that "pulls" you forward, and it is given by
[tex]F_s = \mu_s mg[/tex]
According to Newton's second law, the net force acting on you (so, the frictional force) must be equal to your mass times the acceleration, so we have
[tex]F= ma = \mu_s mg[/tex]
from which we find
[tex]\mu_s = \frac{a}{g}=\frac{0.39 g}{g}=0.39[/tex]
so, the minimum coefficient of static friction must be 0.39.
The minimum coefficient of static friction required to prevent slipping on a train accelerating at 0.39g must be equal to or greater than 0.39.
Explanation:To calculate the minimum coefficient of static friction required to prevent you from sliding on a train accelerating at 0.39g (where g is the acceleration due to gravity), you need to understand the relationship between static friction (Fs) and the normal force (N). Let's denote the coefficient of static friction as μs. The maximum force of static friction (μsN) should be equal to or greater than the force needed to overcome the train's acceleration to avoid slipping.
Since the acceleration of the train is 0.39g, and g is 9.81 m/s² (the acceleration due to gravity), the force due to the train's acceleration can be expressed as 0.39 × your mass × g. Considering that your mass × g gives us the normal force (N), the equation to avoid slipping becomes:
Fs ≥ 0.39 × N
Substituting the force of static friction equation (Fs = μs × N), we get:
μs × N ≥ 0.39 × N
Since N appears on both sides of the inequality, they cancel each other out, and you are left with:
μs ≥ 0.39
This means the minimum coefficient of static friction must be 0.39 or greater to prevent sliding.
An object is lifted from the surface of aspherical planet to an altitude equal to the radius of the planet.As a result, what happens to the mass and wieght of theobject?
massincreases; weight decreases
massdecreases; weight decreases
massincreases; weight increases
massincreases; weight remains the same
mass remainsthe same; weight decreases
mass remainsthe same; weight increases
mass remainsthe same; weight remains the same
An object is lifted from the surface of a spherical planet to an altitude equal to the radius of the planet.
As a result, the object's mass remains the same, and its weight decreases to 1/4 of whatever it is when the object is on the planet's surface.
What is the difference between transverse and longitudinal waves? Transverse waves always have greater frequencies than do longitudinal waves. Transverse waves always travel at smaller speeds than do longitudinal waves. In a transverse wave the disturbance always occurs perpendicular to the direction in which the wave travels, whereas in a longitudinal wave the disturbance always occurs parallel to the line of travel of the wave. In a transverse wave the disturbance always occurs parallel to the line of travel of the wave, whereas in a longitudinal wave the disturbance always occurs perpendicular to the direction in which the wave travels. Transverse waves always carry more energy than do longitudinal waves.
Answer:
A
Explanation:
Which portion of the electromagnetic spectrum is used in a television
Radio waves are a type of electromagnetic radiation with wavelengths between 10 m to 10,000 m. In the electromagnetic spectrum this wavelength is longer than infrared light and therefore, it goes beyond the visible spectrum.
This type of electromagnetic waves is very well reflected in the ionosphere, the layer of the atmosphere through which they travel directly or using repeaters.
In addition, they are very useful to transport information, being important in telecommunications. They are used not only for conventional radio transmissions but also in mobile telephony and TV.
It should be noted that since radio signals have large wavelengths, they can be diffracted around certain obstacles, such as hills and mountain ranges, preventing the signal from reaching its destination.
Alana drew a diagram to compare the life cycles of low-mass and high-mass stars.
Which labels belong in the areas marked X, Y, and Z?
A.) X: Nuclear fusion forms hydrogen in the main sequence star.
Y: A white dwarf is part of the cycle.
Z: A supernova is part of the cycle.
B.) X: A white dwarf is part of the cycle.
Y: Nuclear fusion forms hydrogen in the main sequence star.
Z: A supernova is part of the cycle.
C.) X: A protostar is part of the cycle.
Y: It begins in a nebula.
Z: nuclear fusion forms hydrogen in the main sequence star.
D.) X: It begins in a nebula.
Y: Nuclear fusion forms hydrogen in the main sequence star.
Z: A protostar is part of the cycle.
Answer:
B
Explanation:
Both low and high mass stars begin as nebulae, then become protostars. Both use nuclear fusion to form hydrogen in the main sequence.
The differences are that low mass stars have longer life cycles and become white dwarfs. High mass stars have shorter life cycles and undergo supernova explosions.
Answer: b
Explanation:
A train travels 50 kilometers in 4 hours, and then 74 kilometers in 2 hours. What is its average speed?
Answer:
37.65
Explanation:
50/4 + 74/2
If a train travels 50 kilometers in 4 hours, and then 74 kilometers in 2 hours its average speed is 24.75 km / hr.
Explanation:
Speed is related to the ratio of distance and time. Speed = Distance / time.
Speed of the first train = 50 / 4 = 12.5 km / hr
Speed of the second train = 74 / 2 = 3 7 km / hr
Average speed = (12.5 + 3 7 ) / 2 = 24.75 km / hr
So the average speed of the train is 24.75 km / hr.
Someone please help. Describe how electric potential energy, kinetic energy, and work change when two charges of opposite sign are placed near each other.
When two charges of opposite sign are placed near each other, the electric potential energy decreases while the kinetic energy increases.
Explanation:When two charges of opposite sign are placed near each other, the electric potential energy, kinetic energy, and work change in specific ways. Initially, the charges have potential energy due to their position in the electric field. As they move closer together, the potential energy decreases, and this decrease is converted into kinetic energy.
The work done on the charges is negative because energy is being taken away from the system. In other words, the charges are pulling on each other and you need to do work to bring them closer. Overall, the potential energy decreases, and the kinetic energy increases.
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When two charges of opposite sign are placed near each other, the electric potential energy decreases while the kinetic energy increases. Work is done as the charges are brought near each other.
Explanation:When two charges of opposite sign are placed near each other, the electric potential energy changes. The potential energy decreases as the charges approach each other, resulting in a decrease in potential energy. As the potential energy decreases, the kinetic energy of the charges increases. This is because the electric field between the charges accelerates the charges, converting their potential energy into kinetic energy. Lastly, work is done when the charges are brought near each other, as the electrostatic force between the charges can do work on the charges.
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In general, why does a toy car change direction when crossing a boundary between two surfaces, such as hard plastic and a carpet, on which its speed is different? Choose the best explanation based on what you’ve learned in this extension. Select one: a. The wheels of the car move at a different speeds on each surface, so the direction they move in is different. b. Between the time the first wheel crosses the boundary and the last wheel of the car does so, the car wheels are moving at different speeds. This causes the car to turn either left or right. c. Between the time the first wheel of each axle of the car crosses the boundary and last wheel of each axle does so, the wheels on the same axle on moving at different speeds. This causes the car to turn left or right. d. The car turns slightly crossing the boundary because the amount of friction the car experiences on each surface is different, so the interaction between the car and the surface changes, which pushes the car slightly to the left or right.
Answer:
D
Explanation:
The car turns slightly crossing the boundary because the amount of friction the car experiences on each surface is different, so the interaction between the car and the surface changes, which pushes the car slightly to the left or right. Hence, option (d) is correct.
What is speed?Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.
What is friction?
The resistance provided by surfaces in touch as they move past one another is known as friction. To walk without slipping, traction is provided by friction. In most situations, friction is advantageous. They do, however, give a strong amount of opposition to the move.
When the toy car change direction when crossing a boundary between two surfaces, such as hard plastic and a carpet, the frictional force get changed. So, the interaction between the car and the surface changes, which pushes the car slightly to the left or right. Hence option (D) is correct.
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Which is true of a solute dissolved in a solvent? A)The solute raises the freezing point of the solvent. B) The solute raises the boiling point of the solvent. C)The solvent decreases the conductivity of the solute.
Answer:
Hi,
The correct answer option is (B)The solute raises the boiling point of the solvent
Explanation:
Boiling point of a solvent is affected by the number of particles in a solution.Adding a solute to a solvent increases its boiling point because it lowers the vapor pressure of the solution.This is all about colligative properties where a decrease in vapor pressure will mean more heat needed to heat the solution to a boiling point.
All the best.
The true statement is that a solute raises the boiling point of a solvent. This is known as boiling point elevation. In contrary a solute will decrease the freezing point of a solvent and increase its conductivity.
Explanation:When a solute is dissolved in a solvent it affects the properties of the solvent. The true statement from the given choices is option B - The solute raises the boiling point of the solvent. The process is called boiling point elevation. It's a colligative property meaning it relies on the number of dissolved particles in solution regardless of their nature. For example, when salt (solute) is added to water (solvent) the water’s boiling point increases.
Option A is incorrect because in actuality, a solute decreases the freezing point of a solvent. The solvent does not decrease the conductivity of the solute (Option C) but instead dissolution often increases conductivity.
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The location of the center of our galaxy was first determined by observations of
The location of the center of our Galaxy was first determined by observations of Globular Clusters
When did newton publish his laws of motion
Answer:
The three laws of motion were first compiled by Isaac Newton in his Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy), first published in 1687.
Explanation: