It should be the first answer. I'm sorry if it's wrong
Coal production is costly because coal is found deep underground, necessitating expensive mining operations. Corrent answers are 1.coal is found deep underground, 2. Coal is expensive to make and 3. Coal is only found in certain places on earth.
Coal production is costly primarily because coal is found deep underground. This necessitates extensive and expensive mining operations to extract the coal.
There are two main methods of coal mining:
Surface mining: This involves removing the topsoil to access coal seams close to the surface. It is cheaper but causes significant environmental damage.Underground mining: This method is used for coal that is deep beneath the Earth's surface. It involves digging tunnels and is more hazardous and costly due to safety concerns and complex machinery.Furthermore, transporting the mined coal to power plants or industrial sites adds to the cost. Lastly, coal processing, which involves cleaning and removing impurities, adds another layer of expense.
Corrent answers are 1.coal is found deep underground, 2. Coal is expensive to make and 3. Coal is only found in certain places on earth.
One charge is decreased to one-third of its original value, and a second charge is decreased to one-half of its original value. how will the electrical force between the cahrges compare to the original force
it will decrease to 6 times the original force
it willnincrease to 36 times the original force
it will decrease to one-sixth the original force
it will decrease to one-thirty-sixth the original force
I just had this question on my test, the answer is C.
Answer:
The new force will decrease to one sixth the original value.
Explanation:
It is given that,
One charge is decreased to one-third of its original value, and a second charge is decreased to one-half of its original value.
Let, [tex]q'_1=\dfrac{1}{3}q_1[/tex] q₁ is the charge 1
[tex]q'_2=\dfrac{1}{2}q_2[/tex] q₂ is the charge 2
Initially, the electrical force between the charges is given by :
[tex]F=k\dfrac{q_1q_2}{r^2}[/tex]...........(1)
Let F' is the new force i.e.
[tex]F'=k\dfrac{q'_1q'_2}{r^2}[/tex]
So,
[tex]F'=k\dfrac{\dfrac{1}{3}q_1\times \dfrac{1}{2}q_2}{r^2}[/tex]
[tex]F'=\dfrac{1}{6}k\dfrac{q_1q_2}{r^2}[/tex]
[tex]F'=\dfrac{1}{6}F[/tex] (from equation 1)
Hence, the new force will decrease to one sixth the original value.
What is a non example of temperature
We measure temperature of matters with a device called thermometer. There are three types of thermometer, Celsius Thermometer, Fahrenheit Thermometer and Kelvin Thermometer.
Non-examples of temperature include instances like inaccurately implying ratios in temperature, thinking an increase in internal energy always results in an increase in temperature, and misconceptions about absolute zero in temperature scales.
Explanation:A non-example of temperature could be simply understood as a situation or instance where temperature doesn't play a significant role, or where the notion of temperature as we usually perceive it, does not apply. For instance, the concept of ratio or multiplication in temperature such as saying 80 °C is four times as hot as 20 °C is a non-example, because there's no meaning to the ratio of 80 to 20 (or four to one) in the context of temperature. Another non-example is the assumption that increasing internal energy of a system necessarily increases its temperature; this is not always true. The temperature does not change when a substance changes from one phase to another, like during the melting of ice. This can be accomplished by adding heat or doing frictional work without changing temperature.
The concept of absolute zero, where there is zero molecular motion, is another perception which sometimes confounds the casual understanding of temperature, especially in cases like Celsius (C) and Fahrenheit (F) temperature scales where 0 degrees does not mean absence of heat because temperatures lower than zero exist and are in fact colder. Thus, these cases represent non-examples of common understanding of temperature.
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Choose all the answers that apply. Which of the following forces require physical contact?
A. tension
B. air resistance
C. friction
D. magnetic force
E. applied force
CHOOSE ALL THAT APPLY PLEASE!
The answers are:
A. Tension
B. Air resistance
C. Friction
E. Applied force
Why?Let's discard each given option in order to find what forces requires physical contact:
A. Tension, correct: Tension force appears when it's a force pulling another object, trying to move it in the same direction, the tension usually involves a rope or cable used to pull another object. For example, a mass being held with a rope/cable.
B. Air resistance, correct: Air resistance, or drag, is a force acting in the opposite direction of a body in motion when it's passing through the air, involving contact between the air molecules and the surface of the object. For example, when an airplane is flying, it's being affected by the air resistance, making it move slower.
C. Friction, correct: The friction appears when there is an object surface being in contact with another object surface, both or just one can be in motion, the frictional forces always go in the opposite direction of the motion. For example, when you try to pull a box from a place to another, there is always a force that opposes to the movement, making you to apply more force in order to move the object, it's the frictional force.
D. Magnetic force, incorrect: Magnetic force does not require physical contact between objects. The magnetic force acts on an object, pulling or attracting it. For example, using a magnet to attract a metallic object does not involve any physical contact, the force acts on the metallic object attracting it with no contact.
E. Applied force, correct: The applied forces involve physical contacts, applying forces on an object can result in the object motion. For example, pushing a button, the button us bein affected by an applied force and it will move in the same direction that the force.
Have a nice day!
Answer:
A. Tension
B. Air resistance
C. Friction
E. Applied force
Explanation:
A(n)is produced around a wire when an electrical current is in the wire.
Answer: The correct answer is "magnetic field".
Explanation:
A magnetic field is produced around the current carrying wire.
If you bring compass needle around the current carrying wire then it shows the deflection which indicates that there is a magnetic field around the current carrying wire.
Magnetic fields are the area around the surrounding of magnet in which magnetic force can be experienced.
Therefore, a magnetic field is produced around a wire when an electrical current is in the wire.
magnetic field took the test
A candle is placed 40cm in front of a convex mirror with a focal length of 20cm, as shown on the diagram. What is the distance from the lens to the image?
-40 is the correct answer
What is the magnetic flux, in units of mWb (milliWeber), in a cross sectional area of 0.074 m^2 when the magnetic flux density of 0.92 T passes through the area at an angle of 52 degrees?
Answer:
54 mWb
Explanation:
The magnetic flux linkage through the coil is given by:
[tex]\Phi = BA sin \theta[/tex]
where
B is the magnetic field strength
A is the cross sectional area
[tex]\theta[/tex] is the angle between the direction of the field and the normal to the coil
In this problem:
B = 0.92 T
A = 0.074 m^2
[tex]\theta=52^{\circ}[/tex]
Therefore, the magnetic flux linkage is
[tex]\Phi = (0.92 T)(0.074 m^2) sin 52^{\circ}=0.054 Wb=54 mWb[/tex]
The quality or condition of being intense:
A)Electricity
B)Potential Energy
C)Measurement
D)Intensity
d
please give me brainlest
I think that the answer is D, not sure though
tell me if I'm wrong please.
how much work is done using a 500 W microwave for 5 minutes
Answer:
[tex]1.5\cdot 10^5 J[/tex]
Explanation:
The power used by an object is defined as:
[tex]P=\frac{W}{t}[/tex]
where
W is the amount of work done by the object
t is the time taken
In this problem, we have:
P = 500 W is the power of the microwave
[tex]t=5 min=300 s[/tex] is the time taken
So we can solve the formula for W, the work done by the microwave:
[tex]W=Pt=(500 W)(300 s)=1.5\cdot 10^5 J[/tex]
friction is a force
a. that helps two objects move faster when they are touching.
b. that operates against motion when two objects are touching.
c. that gets stronger when two objects move away from each other.
d. that exists between any two objects in the universe.
NEED ASAP!!
Answer:
The answer is B
That operates against motion when two objects are touching
Explanation:
Friction is a force that operates against motion when two objects or surfaces are touching. Friction is applied in the direction that is opposite the direction of motion.
Friction is a force that operates against motion when two objects are touching. So, option b is correct.
What is meant by friction ?Friction is defined as the opposing force exerted by the surface when an object moves on it.
Here,
Friction is a resistive force that opposes relative motion between two surfaces. It is exerted by the surface on an object that is moving on it, which is in contact with the surface. So, frictional force is a contact force. It prevents sliding or rolling of an object on a surface in contact. It acts against the motion or the applied force. The object can move only if the applied force on the object overcomes the frictional force exerted by the surface. Frictional force is of various types.
Friction can also act on stationary object.
Friction causes wear and tear to the parts of machines.
Friction is known as resistive force because it always acts against the motion when there is a relative motion between surfaces.
Hence,
Friction is a force that operates against motion when two objects are touching. So, option b is correct.
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Products must equal which in a chemical reaction?
Reactants
atoms
elements
molecules
I think it is reactants
Products must equal reactants in a chemical reaction. This is known as the law of conservation of mass.
What is a chemical reaction?In a chemical reaction, one or more reactants (also known as reactants) are changed into one or more products (also known as products).
If there are the same number of atoms of various elements on either side of the equation, then the total atomic mass on the products side will be equal to the reactants side.
This should happen according to the law of conservation of mass in chemical reactions.
This means that during a chemical reaction, no atoms are created or destroyed. They are merely rearranged to form new molecules. This is why chemical equations must be balanced, or have the same number of atoms of each element on both sides of the equation.
By balancing the equation, we ensure that the law of conservation of mass is obeyed and that the products equal the reactants in terms of the number and type of atoms and molecules involved.
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Which of these best describes the difference between energy and power? A) Power and energy have nothing in common B) Energy and power are the exact same thing. C) Energy has a time component while power does not. D) Power has a time component while energy does not.
D.Power has a time component while energy does not. This is because power is the RATE at which work is performed.
How is the movement of molecules that you observed in both the cases connected to their mass and temperature?
Answer:
As the temperature increases, the kinetic energy of the molecules of the liquid increases.
Explanation:
As the temperature increases, the kinetic energy of the molecules of the liquid increases.
Uranium-238 undergoes alpha decay. Therefore, uranium-238 will
A. Remain stable
B. Stay the same element
C. Release charged particles and no energy
D. None of the above
Uranium-238 undergoes alpha decay. Therefore, uranium-238 will
A. Remain stable
B. Stay the same element
C. Release charged particles and no energy
D. None of the above
The actual answer is that it will change into a different element altogether.
Answer:
D.None of the above.
Explanation:
We are given that uranium-238 undergoes alpha decay.
Therefore, uranium-238 change into into new element of atomic number 2 less and mass number 4 less and releasing an alpha particle because it undergoes alpha decay
U-238[tex]\rightarrow [/tex]an atome with atomic number 2 less and mass number 4 less+ helium particle with atomic number 2 and mass number 4
Alpha decay: When an element undergoes an alpha decay then it transform into an atom with atomic number 2 less and mass number 4 less due to emission of alpha particle (alpha particle means helium particle which have atomic number 2 and mass number 4)
Therefore, option A is false.
B. It is also false.Because a new atom is formed and there is no releasing of charged particle
C.There is no any releasing of charged particle and no energy.Hence, it is false.
Answer :D. None ob the above.
Two shirts are removed from a dryer and attract each other with a force of 0.5N while they are separated by 1 cm. If the two shirts are equally charged, what would their charge and the force be if they are separated by 4 cm?
1) Charge: [tex]7.5\cdot 10^{-8} C[/tex]
Explanation:
The electrostatic force between the two shirts is:
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where
k is the Coulomb's constant
q1 = q2 = q is the charge of each shirt (they are equally charged)
r = 4 cm = 0.04 m is the distance between the shirts
F = 0.5 N is the force
Re-arranging the equation, we can find q, the charge of each shirt:
[tex]q=\sqrt{\frac{Fr^2}{k}}=\sqrt{\frac{(0.5 N)(0.01 m)^2}{9\cdot 10^9}}=7.5\cdot 10^{-8} C[/tex]
2) Force if they are separated by 4 cm: 0.03 N
In this case, the force between the two shirts would be:
[tex]F=k\frac{q_1 q_2}{r^2}=(9\cdot 10^9)\frac{(7.5\cdot 10^{-8}C)^2}{(0.04 m)^2}=0.03 N[/tex]
Answer:
C. 7.4E-6C, 0.03 N
Explanation:
ANSWER ASAP FOR 40 POINTS
The Doppler effect is the result of a ____ sound source that causes the sound to appear higher or lower than its true ____. As a sound source approaches an observer, the distance between each ____ in the wave is ____. This causes a ____ perceived pitch. As a source moves away from an observer, the distance between each crest in the wave is ____. This causes a ____ perceived pitch. The size of the pitch ____ is determined by the speed of the source relative to the speed of ____.
Word Bank
higher
shift
increased
moving
lower
pitch
sound
crest
shortened
Put in this order
higher 2
shift 1
increased 5
moving 9
lower 3
pitch 4
sound 7
crest 6
shortened 8
Hope I got it right :P
1. increased
2.pitch
3.sound
4.shortned
5.lower
6.moving
Use the periodic table from the lesson to answer the following question. The atomic mass of F is ___. 9 10 19 55
18.9 but round it and you get 19
In this case if given those choices your answer would be (C. 19).
However in more complicated Chemistry rules you would learn that the periodic table only showcases 1 of the many possible masses of the element.
Hope this help! :D
What are the characteristics of an ideal transformer
It is an imaginary transformer which has no core loss, no ohmic resistance and no leakage flux. The ideal transformer has the following important characteristic. The resistance of their primary and secondary winding becomes zero. The core of the ideal transformer has infinite permeability.
An ideal transformer is a theoretical device with 100% efficiency, no energy losses, and follows the principle of power conservation. The voltage ratio across the coils is equal to the ratio of their turns. This idealized model helps in understanding transformer behavior without considering real-world inefficiencies.
An ideal transformer is a theoretical device used to model the behavior of real transformers without considering energy losses. Here are the main characteristics of an ideal transformer:
Efficiency: An ideal transformer has 100% efficiency, meaning it does not dissipate power. The power supplied to the primary winding equals the power delivered to the secondary winding.No Energy Losses: There are no losses due to ohmic heating, hysteresis, or eddy currents. The core is assumed to contain all magnetic field lines.Turn Ratios: The voltage ratio between the primary and secondary windings is directly proportional to the ratio of the number of turns on each winding. This is described by V₁/V₂ = N₁/N₂.Power Conservation: The product of current and voltage on the primary side equals the product of current and voltage on the secondary side (V₁ × I₁ = V₂ × I₂).An ideal transformer is thus an efficient, lossless device that perfectly transfers energy between two circuits through magnetic induction.
Strength training combined with cardiovascular fitness makes the body stronger and healthier.
True
False
True. Strength training combined with cardiovascular fitness does make the body stronger and healthier.
Hope this helps. Please mark as brainliest.
The answer is true :)
Sorry took a while to answer
Fill in the appropriate values for each blank as it refers to ATOM 1. The number of protons present in ATOM 1 is _________.
how much chemical energy must be supplied to a car engine if we want it to produce 5000J of kinetic energy and it is 45% efficient
Here i state the conservation of energy rule and use that to justify my answer. I showed how to manipulate percentages to get the final answer of 11000J (2sf). Hope I'm right xx
11,111.11 J of chemical energy must be supplied to the car engine to produce 5000 J of kinetic energy, given that the engine is 45% efficient.
To find the amount of chemical energy that must be supplied to the car engine to produce 5000 J of kinetic energy, we need to consider the efficiency of the engine.
Efficiency is defined as the ratio of useful output energy to the input energy. In this case, the engine is 45% efficient, which means only 45% of the supplied chemical energy is converted into useful kinetic energy.
Let Echemical be the chemical energy supplied to the engine, and Ekinetic be the kinetic energy produced.
Efficiency (η) = (Useful output energy / Input energy) * 100%
η = (Ekinetic / Echemical) * 100%
Given:
Ekinetic = 5000 J
Efficiency (η) = 45% = 0.45 (in decimal form)
Now, we can rearrange the equation to solve for Echemical:
Echemical = Ekinetic / η
Echemical = 5000 J / 0.45
Echemical ≈ 11111.11 J
Hence, approximately 11,111.11 J of chemical energy must be supplied to the car engine to produce 5000 J of kinetic energy, given that the engine is 45% efficient.
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In the following diagram, the voltage is 1.5 volts and the resistance is 7.5 ohms. Use Ohm's law to determine the current in the circuit.
11.3 amps
5.0 amps
6.0 amps
0.2 amps
Answer:
Current in the circuit, I = 0.2 amps
Explanation:
It is given that,
Voltage of the circuit, V = 1.5 volts
Resistance, R = 7.5 ohms
According to Ohm's law, the voltage is equal to the product of current and the resistance.
i.e. [tex]I=\dfrac{V}{R}[/tex]
V is the voltage across the circuit
R is the resistance in the circuit
[tex]I=\dfrac{1.5\ V}{7.5\ \Omega}[/tex]
I = 0.2 amps
Hence, the correct option is (d).
The distance between a proton and an electron is cut in half. How does the force of attraction change? A) The force becomes twice as much. B) The force becomes one-half as much. C) The force becomes four times as much. D) The force becomes one-quarter as much.
The electric force is a force that is inversely proportional to the square of the distance. This can be proved by Coulomb's Law, which states:
"The electrostatic force [tex]F_{E}[/tex] between two point charges [tex]q_{1}[/tex] and [tex]q_{2}[/tex] is proportional to the product of the charges and inversely proportional to the square of the distance [tex]d[/tex] that separates them, and has the direction of the line that joins them"
Mathematically this law is written as:
[tex]F_{E}= K\frac{q_{1}.q_{2}}{d^{2}}[/tex] (1)
Where [tex]K[/tex] is a proportionality constant.
Now, if we say [tex]q_{1}[/tex] is the proton and [tex]q_{2}[/tex] is the electron, and cut the distance between them in half, the new distance will be [tex]\frac{d}{2}[/tex].
Substituting this new distance in equation (1):
[tex]F_{E}= K\frac{q_{1}.q_{2}}{(\frac{d}{2})^{2}}[/tex] (2)
[tex]F_{E}= 4K\frac{q_{1}.q_{2}}{d^{2}}[/tex] (3)>>>As we can see, the force becomes four times stronger
Answer:
The Answer Is C
Explanation:
What does the signal word then accomplish in these sentences
On a standing wave on a string, the minimum number of nodes is 1 and antinodes is 2. True or false?
The statement is False
Final answer:
The statement is false; the minimum number of nodes on a standing wave on a string is 2 (at the fixed ends), and the minimum number of antinodes is 1, seen in the fundamental frequency or first harmonic.
Explanation:
The statement that 'on a standing wave on a string, the minimum number of nodes is 1 and antinodes is 2' is false. On a standing wave on a string that is fixed at both ends, the minimal standing wave pattern would include two nodes and one antinode. This is seen in the fundamental frequency (first harmonic), where the wave has a single antinode in the center of the string and a node at each fixed end. Nodes are points of no motion in standing waves, while an antinode is the location of maximum amplitude of a standing wave.
Determine the velocity of the running man with respect to car A.
Answer:
A) -55 km/
hr
Explanation:
Answer: A) -55 km/h
Explanation: The running man is traveling at -55 km/hr with respect to Car A. If the man were standing still, the car would be passing at 50. Since he is traveling at 5 in the opposite direction, that direction is positive, to him. His velocity now adds to the car velocity (50 + 5), but negative to account for the opposite direction.
Hope this helps!
in order for production to take place, the question of what is to be produced must be answered. which of the following is another question that must be answered in order for production to take place?
How is production to be organized? is the correct answer on APEX.
Answer:how is production to be organised
Explanation:
Please select the word from the list that best fits the definition most destructive kind of mass movement
The most destructive kind of mass movement a landslide.
What is mass movement?why landslide definition most destructive kind of mass movement?Mass movements are downhill events that transport sediment and other debris, and there are four types of mass movement that have varying degrees of destructiveness. They are landslides, flows, slumps, and creep.The four types of mass movement include landslides, slump, creep, and mudflows. Landslides occur when masses of soil and rocks move down a steep slope.The most destructive type of mass movement is a landslide, which occurs when rock and soil slide quickly down a steep slope. Some landslides may contain huge masses of rock, while others may contain only a small amount of rock and soil.Landslide is the most destructive kind of mass movement.
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two charges attract each other with a force of 1.2 * 10⁻⁶N. Calculate the force that would act between the two charges when distance is doubled, halved, trebled.
1. When the distance is doubled: [tex]3\cdot 10^{-7}N[/tex]
The electrostatic force between two charges is given by:
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where
k is the Coulomb's constant
q1 and q2 are the two charges
r is the distance between the two charges
The initial force between the two charges is [tex]F=1.2\cdot 10^{-6}N[/tex]. In this part of the problem, the distance between the two charges is doubled, so we can write
[tex]r'=2r[/tex]
And substituting into the formula, we find the new force:
[tex]F'=k\frac{q_1 q_2}{r'^2}=k\frac{q_1 q_2}{(2r)^2}=\frac{1}{4}k\frac{q_1 q_2}{r^2}=\frac{F}{4}[/tex]
So, the force is reduced to 1/4 of its original value. Therefore, it is
[tex]F'=\frac{1.2\cdot 10^{-6} N}{4}=3\cdot 10^{-7}N[/tex]
2. When the distance is halved: [tex]4.8\cdot 10^{-6}N[/tex]
The initial force between the two charges is [tex]F=1.2\cdot 10^{-6}N[/tex]. In this part of the problem, the distance between the two charges is halved, so we can write
[tex]r'=r/2[/tex]
And substituting into the formula, we find the new force:
[tex]F'=k\frac{q_1 q_2}{r'^2}=k\frac{q_1 q_2}{(r/2)^2}=4k\frac{q_1 q_2}{r^2}=4F[/tex]
So, the force is quadrupled. Therefore, it is
[tex]F'=4(1.2\cdot 10^{-6} N)=4.8\cdot 10^{-6}N[/tex]
3. When the distance is tripled: [tex]1.33\cdot 10^{-7}N[/tex]
The initial force between the two charges is [tex]F=1.2\cdot 10^{-6}N[/tex]. In this part of the problem, the distance between the two charges is tripled, so we can write
[tex]r'=3r[/tex]
And substituting into the formula, we find the new force:
[tex]F'=k\frac{q_1 q_2}{r'^2}=k\frac{q_1 q_2}{(3r)^2}=\frac{1}{9}k\frac{q_1 q_2}{r^2}=\frac{F}{9}[/tex]
So, the force is reduced to 1/9 of its original value. Therefore, it is
[tex]F'=\frac{1.2\cdot 10^{-6} N}{9}=1.33\cdot 10^{-7}N[/tex]
At what point is its PE a maximum? 1. midway between the highest and lowest points 2. at the highest point 3. at the lowest point 4. The PE does not change.
Answer:
2. at the highest point
Explanation:
For a generic object, the PE (gravitational potential energy) is defined as
PE = mgh
where
m is the mass of the object
g is the gravitational acceleration
h is the height of the object with respect to the ground
From the formula, we see that PE is maximum when h is maximum: so the PE is maximum when the object is at the highest point.
Help with this plz!!!
The answer is:
It is virtual and behind the mirror.
Mirrors produce images, either virtual or real.
Virtual images are produced when the image is behind the mirror. Real images are formed when they image is produced in front of the mirror.
So look at the image produced. It's small and found in behind the mirror. This means that it is a virtual image. How do I know that its behind the mirror?
When you look at the diagram, the front side of the mirror is the blue side. This is a convex mirror.