Can you think of a way to explain Hubble's Law other than the
standard Big Bang idea, which includes the concept of a Universe
with no center and no edge?
Answers
An alternative way to explain Hubble's Law without relying on the standard Big Bang idea of a universe with no center and no edge is through the concept of a "tired light" hypothesis.
According to this hypothesis, the redshift observed in distant galaxies is not due to their motion away from us in an expanding universe, but rather the result of photons gradually losing energy as they travel through space.
In the tired light scenario, the wavelength of light is thought to stretch over time due to interactions with matter or other unknown processes. As a result, the light from distant galaxies appears redshifted, mimicking the effect of cosmic expansion. This explanation implies that the universe may have a finite size and a center, challenging the notion of an infinite and uniformly expanding universe.
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Related Questions
what charcateristic of the elctromagnetic wave predicted by maxwells theiry led him to suggest that light moight be an elctromagnetic wave? explain
Answers
The characteristic of the electromagnetic wave predicted by Maxwell's theory that led him to suggest that light might be an electromagnetic wave is the speed of propagation.
Maxwell's equations, formulated in the 19th century, mathematically described the behavior of electric and magnetic fields. Through his equations, Maxwell found that electromagnetic waves propagate through space at a specific speed, which he calculated to be equal to the known speed of light. This revelation was significant because it indicated a fundamental connection between light and electromagnetic waves.
Maxwell realized that the properties of light, such as its ability to travel through a vacuum and its wave-like nature, could be explained if light itself were an electromagnetic wave. By applying his equations to the phenomena of light, he could account for its behavior, including reflection, refraction, and interference.
Thus, Maxwell's theory provided a strong basis for suggesting that light might be an electromagnetic wave due to the remarkable agreement between the predicted speed of electromagnetic waves and the known speed of light. This insight played a pivotal role in the development of the electromagnetic theory of light, which established the understanding that light is an electromagnetic phenomenon.
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A batter pops a ball straight up (a) If the ball returns to the height from which it was hit 4.5 s later, what was its
initial speed? (b) Does the ball reach its maximum height 2.25s after it was hit, more than 2.25s after it was hit, or
less than 2.25s after it was hit? Explain. (c) Find the maximum height of the ball, as measured from the point
where it was hit.
Answers
Answer:
it depends on how hard and fast he hit the ball a baseballs terminal velocity, a baseball can reach a velocity of around 95mph
How tall is golaith in centimeters?
Answers
Answer:
290
Explanation:
Reflection about how you're going to relate low of acceleration to your life?
Answers
Reflection is the process of thinking about something and analyzing it in relation to one's own experiences and perspectives.
In the context of the law of acceleration, this means considering how this law affects our everyday lives and the decisions we make.
One way that the law of acceleration relates to my life is through my use of technology. The law of acceleration states that an object's acceleration is directly proportional to the net force acting on it and inversely proportional to its mass.
This means that as technology becomes more advanced and lighter in weight, it also becomes faster and more efficient. This directly affects my daily life, as I rely on technology for communication, entertainment, and work.
Another way that the law of acceleration relates to my life is through my experiences with transportation. Whether I am driving a car, riding a bike, or taking public transit, the law of acceleration is at play. Understanding how acceleration works allows me to make informed decisions about how to safely and efficiently get from one place to another.
Overall, the law of acceleration is a fundamental principle that affects many aspects of our daily lives. By reflecting on how it relates to my own life, I can better understand the world around me and make more informed decisions.
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the control voltage in an air-conditioning system comes directly from
Answers
The control voltage in an air-conditioning system typically comes directly from the system's thermostat or control panel.
The thermostat senses the room's temperature and, based on the desired temperature setting, sends a control voltage signal to the various components, such as the compressor, condenser, and evaporator, to regulate their operation. This voltage is usually lower (24 volts) compared to the main power supply voltage (120/240 volts) and is used to control the contactors or relays, which in turn switch the high-voltage components on or off. The control voltage enables precise temperature control, energy efficiency, and safe operation of the air-conditioning system, ensuring a comfortable indoor environment.
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what is the last thing you should do just before moving away from the right curb to enter traffic?
Answers
Before moving away from the right curb to enter traffic, it is essential to perform several important checks to ensure a safe maneuver.
First, ensure that your vehicle is properly positioned close to the right curb, allowing enough space for traffic to pass on your left. Adjust your side and rearview mirrors to provide maximum visibility.
Once your vehicle is properly positioned, activate your turn signal to indicate your intention to merge into traffic. Check your rearview mirror to assess the speed and distance of approaching vehicles. Then, glance over your left shoulder to check your blind spot, an area that may not be visible in your mirrors.
This last shoulder check is critical as it helps you identify any vehicles, cyclists, or pedestrians that may be approaching from behind and could potentially be in your path as you move away from the curb. By performing this check, you can ensure that there are no hidden hazards and that it is safe to merge into the traffic lane.
Remember, maintaining awareness of your surroundings and performing the necessary checks before entering traffic is vital for a safe and successful merge.
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Apartheid was a discriminatory policy practiced by the south african government. the united states and other nations implemented economic sanctions to pressure the government to end apartheid.
group of answer choices
countries limited trade, investment, and aid to south africa.
international organizations increased foreign aid to south africa.
world leaders refused to give south africa diplomatic recognition.
defense treaties were signed with south africa to spread democracy.
Answers
Countries limited trade, investment, and aid to South Africa.
What measures did countries take to pressure the South African government to end apartheid?During the era of apartheid in South Africa, which lasted from 1948 to 1994, the South African government implemented a system of institutionalized racial segregation and discrimination.
The policy of apartheid denied basic human rights and freedoms to the non-white population, particularly black South Africans. In response to this unjust system, many countries, including the United States and other nations, implemented economic sanctions against South Africa.
Economic sanctions are measures taken by countries or international bodies to exert pressure on a government or regime by limiting or restricting trade, investment, and financial aid.
In the case of apartheid South Africa, these economic sanctions were aimed at isolating the South African government and encouraging them to dismantle the apartheid system.
By limiting trade, investment, and aid to South Africa, countries sought to economically isolate the apartheid regime and show their disapproval of its discriminatory policies. The goal was to create economic pressure and encourage the South African government to change its stance on apartheid and work towards ending the system.
It is important to note that international organizations and world leaders also played significant roles in the fight against apartheid. However, the specific statements mentioned in the options provided do not accurately reflect their actions during that time.
Overall, the primary approach taken by countries was to limit trade, investment, and aid to South Africa as a means to pressure the government and contribute to the eventual dismantling of apartheid.
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the spring-like property that returns muscle to its original length after a contraction ends is
Answers
The spring-like property that returns a muscle to its original length after a contraction ends is known as muscle elasticity. When a muscle contracts, it generates force and shortens in length. This contraction is achieved by the sliding of actin and myosin filaments within the muscle fibers.
However, once the contraction is over and the force is no longer applied, the muscle has the remarkable ability to return to its original length.
Muscle elasticity is attributed to two main factors: the structural arrangement of proteins within the muscle fibers and the connective tissue surrounding the muscle.
The proteins act as molecular springs that can be stretched and then recoil back to their original position when the force is released. This property allows the muscle to efficiently generate and transmit forces during movement.
Additionally, the connective tissue, such as tendons and fascia, surrounding the muscle acts as a supportive framework. It stores and releases energy during muscle contractions, assisting in the recoil and restoration of the muscle's original length.
Overall, muscle elasticity is essential for the proper functioning of our musculoskeletal system, allowing us to move efficiently and smoothly while maintaining the integrity of our muscles.
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A vector points 12.0 units along the x-axis, and 9.00 units along the y-axis.
Find the direction of the vector.
Answers
Answer:
15 units NE
Explanation:
Assuming the coordinate plane is a compass with N being the positive y-axis, we can use the Pythagorean theorem to find the magnitude of the vector. Since the vector is going up by 12 and right by 9 at the same time, it should form a diagonal line, aka the hypotenuse of a triangle. This triangle has both of its leg units as 12, and 9. Pythagorean theorem states that a^2 + b^2 = c^2, that is both of their legs squared is the hypotenuse of the triangle squared. 12^2 + 9^2 = c^2. c = 15. Now that we know the magnitude, let's go back to the quadrants as the compass. Since both units are positive, the vector goes in the positive direction on both sides, which is Quadrant 1. North and East would be the appropriate say for the vector's direction, thus the vector's direction will be 15 units North East.
How is a pitch that is heard when waves are closely spaced together described?
A.the same as when waves are spaced far apart
B.high
C.low
Answers
Answer:
The answer is high
Explanation:
I just took the test :))
Higher frequency and higher pitch are produced by sounds with shorter wavelengths. So, long waves sound low and short waves sound high.
What are wave properties?Physical characteristics of waves, such as transmission, reflection, polarization, diffraction, and refraction, are examples of wave attributes.
Waves are described mathematically using terms like wavelength, frequency, and amplitude.
Sound and light are two examples of common waves we encounter. Whether you're discussing waves or vibrations.
All of them may be classified according to the following four factors: amplitude, wavelength, frequency, and speed.
According to the graph, pitch perception is influenced by tone strength; below 1000 Hz, pitch tends to decrease with increasing loudness, and beyond 1000 Hz, pitch tends to increase.
Therefore, high pitch that is heard when waves are closely spaced together.
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earth is located at one of the moon's orbit.target 1 of 6 2. according to kepler's second law, jupiter will be traveling most slowly around the sun when at .target 2 of 6 3. earth orbits in the shape of a/an blankaround the sun.target 3 of 6 4. the mathematical form of kepler's third law measures the period in years and the blankin astronomical units (au).target 4 of 6 5. according to kepler's second law, pluto will be traveling fastest around the sun when at blank.target 5 of 6 6. the extent to which mars' orbit differs from a perfect circle is called its
Answers
1. Earth is located at one focus of the Moon's orbit.
2. According to kepler's second law, jupiter will be traveling most slowly around the sun's aphelion
3. Earth orbits in the shape of a/an ellipse around the sun.
4. The mathematical form of Kepler's third law measures the period in years and the semimajor axis in astronomical units (AU).
5. According to Kepler's second law, Pluto will be traveling fastest around the Sun when at perihelion.
6. The extent to which Mar's orbit differs from a perfect circle is eccentricity.
What is kepler's second and third law?
Kepler's second law is a mathematical principle that states the distance between two objects in space is proportional to the square of their timescale of revolution. This means that as two objects orbit around each other, the further they will be from each other over time.
Kepler's Third Law is a scientific law that states the amount of time it takes for planets to orbit their star is inversely proportional to their distance from the sun.
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Yes! All orbiting objects adhere to Kepler's Second Law and other rules as well. Pluto moves more quickly when it is nearer the sun and less quickly when it is distant from it, much like every other object in our solar system.
What is Kepler's law of planetary motion?In astronomy, Johannes Kepler's laws of planetary motion, which were written between 1609 and 1619, define the paths taken by planets as they round the Sun. The laws altered Nicolaus Copernicus' heliocentric theory, substituting elliptical trajectories for circular orbits and epicycles, thereby explaining the variation in planetary velocities. According to the three laws:
A planet's orbit is an ellipse with the Sun as one of its two foci.Equal areas are covered over equal times by a line segment connecting a planet and the Sun.The semi-major axis of an orbital system is related to the square of the planet's orbital period.To know more about Kepler's law, visit:
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A fully charged capacitor initially has an air gap and is disconnected from the battery. A dielectric material is inserted between the plates
What happen to the free charge at surface of the capacitor plates and the total charge free and bound at the surface of the capacitor plates?
Answers
When a dielectric material is inserted between the plates of a charged capacitor, the free charge on the surface of the plates will remain unchanged, while the total charge (free and bound) on the surface of the plates will decrease.
What is dielectric material?
A dielectric material is an insulating material that can store electrical energy in an electric field. In other words, it is a material that has a high resistance to the flow of electric current and does not conduct electricity.
Dielectric materials are commonly used as insulators in capacitors, which are electronic components that store electrical energy in an electric field. When a dielectric material is placed between the plates of a capacitor, it increases the capacitance of the capacitor, allowing it to store more electrical energy.
Examples of dielectric materials include air, glass, ceramics, and certain plastics. The properties of a dielectric material, such as its dielectric constant, determine how effective it is at storing electrical energy in an electric field.
Overall, dielectric materials play an important role in many electrical and electronic devices, including capacitors, transformers, and other components that use electric fields to store and transfer electrical energy.
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A ball dropped from the top of a building is an example of
A. Constant speed
B. Instantaneous speed
C. Combining displacements
D. Free fall
Answers
What questions do you still have about supermassive black holes after watching this Ted Talk? Do you feel that you have a deeper understanding of what they are and why they are important, like was asked of you in the third question? Explain and discuss.
Answers
After watching the Ted Talk, there were still a few questions that I had about supermassive black holes. Firstly, I wanted to know more about the event horizon and what it exactly entails. Although the speaker briefly touched upon this subject, I would have appreciated a more in-depth explanation. Additionally, I would have liked to know more about the role of supermassive black holes in the universe.
While the speaker did mention that these black holes are responsible for the creation of galaxies, I wanted to know more about how this process works and why it is so important.Despite these questions, I do feel that I have a deeper understanding of supermassive black holes and their importance.From the Ted Talk, I learned that supermassive black holes are some of the largest objects in the universe and are essential for the formation of galaxies. I also learned that these black holes are incredibly powerful and have the ability to affect the trajectory of stars and planets.Overall, I think that the Ted Talk did a great job of explaining supermassive black holes in a way that was easy to understand. While there were still a few questions that I had after watching the video, I feel that I now have a better grasp of what supermassive black holes are and why they are so important.For such more question on supermassive
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A negatively charged particle is placed in a uniform electric field directed West. What are the magnitude and direction of the particle's acceleration if its charge is q= -6 μC, its mass m = 2 grams, and the value of electric field E is 6 x10 N/C? Select the closest answer:
A) West. A= 1. 8x108 m/s2
B) East. A = 1. 8x103 m/s2
C) West. A = 1. 8x10+3 m/s2
D) East. A = 1. 8x108 m/s2
E) East. A = 1. 8x105 m/s2
Answers
The correct answer is option E, which is eastward with a magnitude of 1.8 x 10^5 m/s^2.
A negatively charged particle is placed in a uniform electric field directed West. What are the magnitude and direction of the particle's acceleration if its charge is q= -6 μC, its mass m = 2 grams, and the value of electric field E is 6 x10 N/C?The magnitude of the force experienced by the charged particle (q) is F=qE.From Newton's second law, we know that acceleration is given by:F = maTherefore, we can find the magnitude of acceleration asa = F/mSubstituting the values given in the problem,a = F/m = qE/m = (-6x10^-6 C)(6x10^5 N/C) / 0.002 kg= -1.8x10^3 m/s^2Since the charge of the particle is negative, the force is opposite to the direction of the electric field. Therefore, the force and acceleration both point towards the east.
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To finance the purchase of an electric guitar and amplifier from Leon's Guitars, Milo signs an instrument promising to pay to "National Lenders" $1,800 with interest in installments with the final payment due August 15, 2014. To be negotiable, this instrument must include on its face
a. any conditions on the sale of the goods.
b. no conditions.
c. any conditions to the repayment of the loan.
d. any conditions to the disbursement of the funds
Answers
To be negotiable, this instrument must include on its face no conditions. The correct option is b.
In the context of negotiable instruments, such as promissory notes, there are certain requirements that must be met for the instrument to be legally negotiable. One of these requirements is that the instrument must be unconditional on its face. This means that the instrument must not contain any conditions or qualifications that would affect the holder's right to payment.
In the case of Milo's promissory note to National Lenders, the note promises to pay a specific sum of money with interest in installments, with the final payment due on a specific date. This is an unconditional promise to pay, and there are no conditions or qualifications that would affect National Lenders' right to payment. Therefore, the instrument meets the requirement of being unconditional on its face and is negotiable.
It is worth noting that there may be other conditions or qualifications related to the sale of the goods or the repayment of the loan that are not included on the face of the instrument. However, as long as these conditions do not affect the holder's right to payment, they do not affect the negotiability of the instrument.
Hence, b. is the correct option.
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A power station that is being started up for the first time generates 6120 MWh of energy over a 10 hour period. (i) If the rated power at full capacity is 660 MW, calculate how long it takes the power station to reach its full power output. (You may assume a constant increase in power from zero to full power) (ii) State what type of power station can be started up fastest and explain why the start-up times for other types of power station are slower. Explain briefly, how this is relevant to optimising the usage of windfarms. c) What is the Bremsstrahlung effect and how can it be avoided in shielding design? d) Sketch the electromagnetic field output from an antenna, describing in detail the two main regions in the output field.
Answers
(i)Therefore, it takes approximately 9.27 hours to reach its full power output.(ii)It is necessary to have quick-start power sources, this helps maintain a stable and reliable electricity supply even when wind speeds fluctuate.(c)The Bremsstrahlung effect needs to be considered to ensure proper radiation protection.(d) The near-field region is characterized by strong electric and magnetic fields while the far-field region represents the radiation zone.
(i) To calculate the time it takes for the power station to reach its full power output, we can use the formula:
Energy = Power × Time
Given that the power station generates 6120 MWh of energy over a 10-hour period and the rated power at full capacity is 660 MW, we can rearrange the formula to solve for time:
Time = Energy ÷ Power
Converting the energy to watt-hours (Wh):
Energy = 6120 MWh × 1,000,000 Wh/MWh = 6,120,000,000 Wh
Converting the power to watt-hours (Wh):
Power = 660 MW × 1,000,000 Wh/MW = 660,000,000 Wh
Now we can calculate the time:
Time = 6,120,000,000 Wh ÷ 660,000,000 Wh ≈ 9.27 hours
Therefore, it takes approximately 9.27 hours (or 9 hours and 16 minutes) for the power station to reach its full power output.
(ii) The type of power station that can be started up fastest is a gas-fired power station. Gas-fired power stations can reach full power output relatively quickly because they use natural gas combustion to produce energy.
In contrast, other types of power stations, such as coal-fired or nuclear power stations, have longer start-up times. Coal-fired power stations require time to heat up the boiler and generate steam, while nuclear power stations need to go through a complex series of procedures to ensure safe and controlled nuclear reactions.
This is relevant to optimizing the usage of windfarms because wind power is intermittent and dependent on the availability of wind. This helps maintain a stable and reliable electricity supply even when wind speeds fluctuate.
(c) The Bremsstrahlung effect is a phenomenon that occurs when charged particles, such as electrons, are decelerated or deflected by the electric fields of atomic nuclei or other charged particles. As a result, they emit electromagnetic radiation in the form of X-rays or gamma rays.
In shielding design, the Bremsstrahlung effect needs to be considered to ensure proper radiation protection. These materials effectively absorb and attenuate the emitted X-rays and gamma rays, reducing the exposure of individuals to harmful radiation.
(d) The electromagnetic field output from an antenna can be represented by two main regions:
Near-field region: This region is closest to the antenna and is also known as the reactive near-field. It extends from the antenna's surface up to a distance typically equal to one wavelength. In the near-field region, the electromagnetic field is characterized by strong electric and magnetic field components.
Far-field region: Also known as the radiating or the Fraunhofer region, this region extends beyond the near-field region.The electric and magnetic fields are perpendicular to each other and to the direction of propagation. The far-field region is further divided into the "Fresnel region," which is closer to the antenna and has some characteristics of the near field, and the "Fraunhofer region," which is farther away and exhibits the properties of the far-field.
The transition between the near-field and the far-field regions is gradual and depends on the antenna's size and operating frequency. The size of the antenna and the distance from it determine the boundary between these regions.
In summary, the near-field region is characterized by strong electric and magnetic fields, while the far-field region represents the radiation zone where the energy is radiated away as electromagnetic waves.
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An online video daredevil is filming a scene where he swings across a river on a vine. The safety crew must use a vine with enough strength so that it doesn't break while swinging. The daredevil's mass is 82.0 kg, the vine is 11.0 m long, and the speed of the daredevil at the bottom of the swing has been determined to be 8.60 m/s. What is the minimum tension force (in N) the vine must be able to support without breaking?
Answers
The minimum tension force (in N) the vine must be able to support without breaking is 3,073.1 N.
What is tension?The tension in a flexible string or rope is the force required to keep the string or rope stretched taut when pulling its end to opposing sides. Tension force formula:
F= ma
F = Tension force (N)
m= Mass (kg)
a= Acceleration (m/s²)
Here,m= 82
kgv= 8.60 m/s
L= 11.0 m
For the swinging motion of the daredevil,
Equating the sum of forces to the mass times acceleration:
F= (mv²)/L
F= (82 kg x 8.60² m/s²) / 11.0 m
F= 54,343.6 N
Therefore, the minimum tension force (in N) the vine must be able to support without breaking is 3,073.1 N.
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after three half-lives of an isotope, 1 billion (one-eighth) of the original isotope’s atoms remain. how many atoms of the daughter product would you expect to be present?
Answers
Approximately 7/8 of the daughter product's initial number of atoms should still be present after three half-lives.
To determine the number of atoms of the daughter product present after three half-lives of an isotope, we can use the concept of radioactive decay.
Each half-life of a radioactive isotope is the time it takes for half of the initial parent atoms to decay into daughter atoms. After three half-lives, the remaining fraction of parent atoms can be calculated as follows:
Remaining fraction = (1/2)^(number of half-lives)
In this case, the remaining fraction is given as 1 billion (one-eighth) of the original isotope's atoms. Let's calculate the remaining fraction:
1/8 = (1/2)³
Now, we can solve for the number of atoms of the daughter product remaining:
Remaining atoms of daughter product = Initial atoms of parent isotope - Remaining atoms of the parent isotope
Let's assume the initial number of parent atoms is N:
Remaining atoms of daughter product = N - N * Remaining fraction
Substituting the calculated remaining fraction of 1/8, we have:
Remaining atoms of daughter product = N - N * (1/8)
Simplifying further:
Remaining atoms of daughter product = N * (1 - 1/8)
Remaining atoms of daughter product = N * (7/8)
Therefore, after three half-lives, we would expect approximately 7/8 of the original number of atoms of the daughter product to be present.
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Please help me i give 60 point i need help now
Answers
Answer:
How many questions should be answered??
Who invented scuba?
1. Benjamin Franklin
2. Mathew Maury
3. Robert Falcon Scot
4. Cousteau and Gagnon
Answers
Answer:
2. Mathew Maury
Explanation:
2. Mathew Maury
4. Cousteau and Gagnon
Explanation:
they made the first successful scuba in 1942
A force of 15 N is applied to a spring, causing it to stretch 0. 3 m. What is the spring constant for this particular spring? N/m.
Answers
251mL=25100L
True or false and why or why not?
Answers
Answer:
False
Explanation:
To find how many liters 251mL is you would need to divide 251 by 100 which is 0.251.
What defines an element?
energy levels
electrons
neutrons
protons
Answers
An object, experiencing no friction, keeps moving at a constant speed. What can we say about the net force on the object?
a) the net force keeping the object going is the same as the force that would be required to stop it
b)the net force is in the same direction as the object's velocity
c)the object is not changing its speed but its velocity might be changing in Direction so if there is a net force it is that right angles to the velocity
d)since the object has no acceleration there is no net force
e)the net force is equal to the weight of the object
Answers
Answer:
Explanation:
Let's look at a mathematical representation of this. The equation for tis is just a souped up version of Newton's 2nd Law:
F - f = ma. It an object is moving at a constant speed, the acceleration of that object is 0. That changes this equation to
F = f which states that the applied Force equals the frictional force, choice a.
at+waht+temperature+must+you+run+this+reaction+to+achieve+97%
Answers
Temperature is the degree of hotness or coldness of an object or substance. The SI unit of temperature is Kelvin."97%": The question suggests that a reaction must be run at a specific temperature to achieve 97% yield or completion. Yield refers to the amount of product obtained from a reaction.
To achieve 97% yield or completion, the reaction must be run at a specific temperature. Temperature plays an essential role in chemical reactions since it affects the rate of reaction, activation energy, and equilibrium. The temperature at which a reaction runs optimally, producing the most product, is known as the reaction's optimum temperature. As a result, the temperature must be controlled during a chemical reaction.To achieve 97%, the reaction must be run at a specific temperature.
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Who was Nikola Tesla?
Answers
Answer:
Nikola Tesla was a Serbian-American inventor, electrical engineer, mechanical engineer, and futurist best known for his contributions to the design of the modern alternating current electricity supply system.
use thermal expansion to find the difference in length between an object that is heated and when it is cooled.
Answers
Thermal expansion is the phenomenon in which the length of a material changes as a result of temperature changes. When heated, most materials expand, whereas when cooled, they shrink. As a result, we can determine the difference in length between a heated and a cooled object using thermal expansion.
Thermal expansion is a phenomenon in which the length of a material changes as a result of temperature changes. When a substance is heated, its constituent atoms vibrate more quickly and energetically, causing them to spread out and take up more space. The difference in length between an object that is heated and when it is cooled can be calculated using the following formula:ΔL = αL₀ΔTWhere:ΔL is the change in length of the object, α is the coefficient of linear expansion, L₀ is the original length of the object, and ΔT is the temperature difference experienced by the object. The coefficient of linear expansion is a measure of how much a material's length changes in response to temperature changes. It is represented by the symbol α and has units of per degree Celsius (°C⁻¹) or per kelvin (K⁻¹).
Thermal expansion is a phenomenon in which the length of a material changes as a result of temperature changes. When a substance is heated, its constituent atoms vibrate more quickly and energetically, causing them to spread out and take up more space. As a result, the substance's volume expands as well as its length. Similarly, when a substance is cooled, its atoms vibrate less quickly and energetically, causing them to pack together more tightly and take up less space. The temperature difference is the difference between the object's temperature when it is heated and when it is cooled.To illustrate this, consider an iron rod that is 1.0 meter long at a temperature of 20°C. The coefficient of linear expansion for iron is 1.2 x 10⁻⁵ K⁻¹. Suppose the rod is heated to a temperature of 200°C and then cooled back to its original temperature. The temperature difference experienced by the rod is therefore ΔT = 200 - 20 = 180°C. Using the formula above, we can calculate the difference in length of the rod as follows:ΔL = αL₀ΔT = (1.2 x 10⁻⁵ K⁻¹) (1.0 m) (180°C) = 0.00216 m = 2.16 mmTherefore, the difference in length between the rod when it is heated and when it is cooled is 2.16 mm.
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2. How are electromagnets different from other magnets?
Answers
Un automóvil acelera de 0 a 140 km/h en 9.8 segundos, determina su aceleración
Answers
Answer:
The acceleration is 14.28 km/h^2
Explanation:
Step one:
Given data
initial speed u= 0 km/h
final speed v= 140km/h
time t= 9.8 seconds
Required
The acceleration of the car
Step two:
From a= v-u/t
substitute
a= 140-0/9.8
a=140/9.8
a=14.28 km/h^2