The limit on the free-fall time off for clouds that collapse to form stars is typically a few million years, depending on their density and other physical properties.
The maximum free-fall time (off) for clouds that burst into stars depends on the density of the cloud and other physical characteristics. The off measures how long it takes for gravity to outweigh gas pressure and bring about a cloud's collapse. The Jeans density is a crucial cloud density at which the staff is generally a few million years.
The balance between gravitational pull and pressure forces resulting from thermal and magnetic support determines this period. Star formation may not occur if the cloud is too dispersed since the tff may be longer than the age of the universe.
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when 3 electrons are removed from the neutral atom what charge will it carry
When 3 electrons are removed from the neutral atom it will carry a positive charge
What charge is a positive chargeThe term positive charge is a term that is used to decsribe the charge that would usually come up due to the electrons that are dficient with respect to protons in a particle.
The elementary charge is approximately 1.6 x 10^-19. The positive charge electron would have the net charge that is a multiple positive of what the elementary charge is. Hence the electrons wuld have to carry positive charge
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What is the kinetic energy of a 1. 4 x 10^2 kg automobile traveling at 90km/h (25m/s)
The kinetic energy of the automobile is 54,687.5 J, which is determined by its mass and velocity. This energy is what keeps the automobile moving and must be dissipated to bring it to a stop.
The kinetic energy (KE) of an object is the energy it possesses by virtue of its motion. It is given by the formula [tex]KE=0.5mv^2[/tex], where m is the mass of the object and v is its velocity.
In this case, we are given the mass of an automobile as [tex]1.4 \times 10^2[/tex] kg and its velocity as 25 m/s. To calculate its kinetic energy, we need to substitute these values in the formula for KE:
[tex]KE = 0.5 \times 1.4 \times 10^2 \times (25)^2[/tex]
[tex]KE = 0.5 \times 1.4 \times 10^2 \times 625[/tex]
KE = 54,687.5 J
Therefore, the kinetic energy of the automobile traveling at 90 km/h (25 m/s) is 54,687.5 J. This amount of kinetic energy is what allows the automobile to continue moving at its current speed, and would need to be dissipated in order to bring the vehicle to a stop.
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by the same reasoning that worked with three slits, you can see that no matter how many slits you have, the maxima will still fall at the same locations as the maxima for two slits. the peak intensity of the maxima will be proportional to n2 , where n is the total number of slits. the energy at the screen is roughly equal to the product of the number of maxima, the peak intensity of a maximum, and the width of a maximum. as n increases, the number and location of the maxima will not change, while the peak intensity of the maxima will increase proportionally to n2 . if the total energy available increases proportionally to n , how does the width of the maxima change?
The total energy available increases proportionally to n, the width of the maxima changes inversely proportionally to n². So, as n increases, the width of the maxima will decrease.
Based on the question, we want to determine how the width of the maxima changes when the total energy available increases proportionally to the number of slits, n.
Using the given information, we know that:
1. The maxima fall at the same locations for any number of slits.
2. The peak intensity of the maxima is proportional to n².
3. The total energy at the screen is roughly equal to the product of the number of maxima, peak intensity of a maximum, and the width of a maximum.
Since the total energy available increases proportionally to n, we can write this relationship as:
Total Energy ∝ n
However, we also know that the total energy at the screen is the product of the number of maxima, peak intensity, and the width of a maximum:
Total Energy ∝ (number of maxima) × (peak intensity) × (width of maxima)
As the number and location of the maxima do not change, the peak intensity of the maxima increases proportionally to n²:
Total Energy ∝ n × n² × (width of maxima)
Now we can equate these two expressions:
n ∝ n³ × (width of maxima)
To solve for the width of the maxima, we can divide both sides by n³:
1/n² ∝ width of maxima
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what is the equation for sound level detected? what is the new equation used when the intensity of a sound is changed by some factor?
The new sound level is 90 dB, which is 10 dB higher than the initial sound level.
The equation for sound level (measured in decibels, or dB) detected is:
L = 10 log(I/I₀)
where L is the sound level in dB, I is the sound intensity being measured, and I₀ is the reference sound intensity of 10^(-12) watts per square meter.
When the intensity of a sound is changed by some factor, the new equation used to calculate the new sound level is:
L₂ = L₁ + 10 log(I₂/I₁)
where L₁ is the initial sound level, L₂ is the new sound level, I₁ is the initial sound intensity, and I₂ is the new sound intensity. This equation shows that the change in sound level is equal to the difference between the initial and new sound levels, plus 10 times the logarithm of the ratio of the new and initial sound intensities.
For example, if the sound level of a particular sound is initially measured as 80 dB, and the intensity of the sound is increased by a factor of 10, the new sound level can be calculated as:
L₂ = 80 + 10 log(10I₁/I₁) = 80 + 10 log(10) = 80 + 10(1) = 90 dB
This means that the new sound level is 90 dB, which is 10 dB higher than the initial sound level.
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a child on a freely rotating merry-go-round moves from near the center to the edge. what will happen to the rotational velocity of the merry-go-round?
The rotational velocity of the merry-go-round will increase when the child moves from near the centre to the edge due to the conservation of angular momentum.
A youngster will accelerate the merry-go-round's rotation as they walk from the centre to the edge of a freely revolving merry-go-round. This is because of the conservation of angular momentum, which asserts that unless an external torque acts on a system, its total angular momentum remains constant.
The child's angular velocity rises as they get closer to the edge because their distance from the axis of rotation widens. The merry-go-round must consequently revolve at a faster rate to make up for the child's further distance from the axis of rotation while still maintaining angular momentum.
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two high precision pendulums move through their equilibrium positions once each second, so that the periods of each is precisely 2.000 s. one of them is in stockholm, sweden and has a length of 0.99542 m. the other is in singapore and has a length of 0.99050 m. what is the ratio of the free-fall acceleration of gravity g at these two cities? (give your answer to at least 5 decimal places.)
The ratio of the free-fall acceleration of gravity g at Singapore to that at Stockholm is approximately 1.00286.
The period of a pendulum is given by:
[tex]T = 2\pi \sqrt{L/g}[/tex]
where T is the period, L is the length of the pendulum, and g is the acceleration due to gravity
Let's first find the value of g in Stockholm:
T = 2 s
L = 0.99542 m
Rearranging the formula, we get:
g = (4π² L) / T²
[tex]g_{Stockholm[/tex] = (4π² × 0.99542 m) / (2 s)² = 9.8214 m/s²
Similarly, let's find the value of g in Singapore:
T = 2 s
L = 0.99050 m
[tex]g_{Stockholm[/tex]= (4π² × 0.99050 m) / (2 s)² = 9.8495 m/s²
The ratio of the free-fall acceleration of gravity g in Singapore to that in Stockholm is:
[tex]g_{Singapore[/tex]/ [tex]g_{Stockholm[/tex]= 9.8495 m/s² / 9.8214 m/s² = 1.002855
Rounding this to 5 decimal places, we get:
[tex]g_{Singapore[/tex] / [tex]g_{Stockholm[/tex]≈ 1.00286
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questionwhich statement is the most correct statement about a gas?responsesa gas has very little thermal energy.a gas has very little thermal energy.a gas takes the shape of its container.a gas takes the shape of its container.a gas holds its shape.a gas holds its shape.a gas is not affected by changes in pressure.a gas is not affected by changes in pressure.
The most correct statement about gas among the given options is "a gas takes the shape of its container."
This is because gases do not have a fixed shape or volume and can fill any container they are placed in, taking on its shape.
The other statements are not accurate. Gases do have thermal energy and are affected by changes in pressure.
Gases do not hold their shape, as they can expand and contract to fill the space available to them.
Gases are highly compressible and can be compressed to occupy a much smaller volume than their original state.
Additionally, the behavior of gases can be explained by the kinetic theory of gases, which states that gases are made up of tiny particles in constant random motion.
This motion results in the transfer of energy, which is responsible for the pressure, temperature, and other properties of gases.
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a 5.95-cm object is placed 33.1 cm away from a convex mirror with a focal length of 10.7 cm.a) what is the distance between the mirror and the image (negative result for a position behind the mirror, a positive result for a position in front of the mirror)?
The distance between the mirror and the image is 16.95 cm.
The mirror equation relates the object distance (p), the image distance (q), and the focal length (f) of a spherical mirror as follows:
1/f = 1/p + 1/q
where distances are measured from the mirror's surface and are positive for distances in front of the mirror, and negative for distances behind the mirror.
Using the given values, we can substitute them into the mirror equation and solve for the image distance:
1/10.7 cm = 1/33.1 cm + 1/q
Simplifying this equation, we get:
q = 1 / (1/f - 1/p)
q = 1 / (1/10.7 cm - 1/33.1 cm)
q = -16.95 cm
The negative sign for the image distance indicates that the image is formed behind the mirror.
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talk through how to solve a problem in which silver needs to be melted completely. Name the equations used and overall process.
When handling high-temperature materials like silver, it is crucial to take
the essential safety precautions, and the right tools and training are
required to prevent mishaps. utilise the formula Q = m L.
To melt silver completely, you would need to provide enough thermal energy to overcome the cohesive forces between the silver atoms and break the solid structure of the metal. This can be achieved by heating the silver above its melting point.
The melting point of silver is 961.78 °C (1763.2 °F). Therefore, you would need to heat the silver to a temperature above this point. You can use a furnace or a crucible to heat the silver. If you use a crucible, you should use one made of a material that can withstand high temperatures, such as graphite or ceramics.
The heat required to melt the silver can be calculated using the equation Q = m × c × ΔT, where Q is the heat required, m is the mass of silver, c is the specific heat of silver, and ΔT is the change in temperature required to melt the silver.
Once the silver has melted completely, you can use the equation Q = m L to calculate the amount of heat required to convert the liquid silver to its vapor state, where L is the heat of fusion of silver.
Overall, the process to melt silver completely involves:
Determining the amount of silver to be melted.
Choosing an appropriate method for heating the silver, such as a furnace or a crucible.
Calculating the amount of heat required to melt the silver using Q = m × c × ΔT, where c is the specific heat of silver and ΔT is the change in temperature required to melt the silver.
Providing the necessary thermal energy to the silver until it reaches its melting point and melts completely.
Calculating the amount of heat required to convert the liquid silver to its vapor state using Q = m × L, where L is the heat of fusion of silver.
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A construction worker holds a heavy tool box. How much work is done by the worker?
Answer:
zero work is done by the worker
The laser light will pass through diffraction gratings, each with a different line spacing. Line spacing is the variable.
The pattern of diffraction will vary as a result of the change in line spacing. The diffraction angle is therefore the variable.
A “constant” is a parameter that stays the same regardless of the variables. The parameter of the laser that stays constant is the .
The parameter of the laser that stays constant is the wavelength of the laser light.
What is wavelength?Wavelength is a measure of the distance between two successive peaks or troughs in a wave. It is the distance over which a wave’s shape repeats itself and is usually measured in meters. Wavelength is inversely proportional to frequency, meaning that the higher the frequency, the shorter the wavelength. Light, sound, and other forms of energy travel in waves, and the wavelength of these waves determines their properties and behavior. Different wavelengths of light are responsible for the visible spectrum of colors, while different wavelengths of sound result in different pitches and tones. Wavelength is an important physical quantity in various fields of study, including physics, engineering, and astronomy.
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Can someone help with this please
The correct statement concerning the capacitance is (B) C₂ > C₃.
What is capacitance?A system's capacitance is its capacity to store an electric charge. It is described as the relationship between the electric charge on each conductor and their respective potential differences.
Since all the capacitors have the same plate area, the capacitance of a parallel-plate capacitor is given by the formula:
C = εA/d
where C is the capacitance, ε is the permittivity of the dielectric material between the plates, A is the area of each plate, and d is the distance between the plates.
The distance between the plates of C₂ are closer together than those of C₃, according to the illustration provided in the question. Therefore, if the permittivity of the dielectric material between the plates is the same for both capacitors, the capacitance of C₂ will be larger than the capacitance of C₃.
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In which situations can the speed adjust by route function of propilot assist with navi-link automatically reduce vehicle speed?
The Speed Adjust by Route function of ProPILOT Assist with Navi-link can automatically reduce vehicle speed in several situations such as approaching curves, exits or junctions, and changing speed limits.
This feature works by using the vehicle's navigation system to predict upcoming road conditions, allowing it to adjust the vehicle's speed accordingly for optimal driving experience and safety. First, the Speed Adjust by Route function can reduce vehicle speed when approaching curves. By doing so, it ensures that the vehicle maintains a safe and comfortable speed while navigating through bends in the road. Second, this function can also reduce speed when approaching exits or junctions, this helps the driver safely transition from highways to slower-speed roadways without the need for manual intervention.
Third, the feature can adjust the vehicle's speed in response to changing speed limits, ensuring the vehicle remains within legal limits and reducing the risk of speeding tickets. In summary, the Speed Adjust by Route function of ProPILOT Assist with Navi-link can automatically reduce vehicle speed in situations such as approaching curves, exits, junctions, and changes in speed limits, providing a safer and more efficient driving experience.
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hubble took spectra of galaxies in the 1930s. what did he find?
In the 1930s, Hubble discovered that galaxies exhibited a redshift in their spectra, indicating that they were moving away from us, which led to the conclusion that the universe is expanding.
Hubble observed and analyzed the spectra of galaxies using a spectrometer. He noticed that the spectral lines of most galaxies were shifted towards the red end of the spectrum, a phenomenon known as redshift. Hubble's discovery of the redshift in galaxy spectra provided evidence for the expanding universe. He realized that galaxies were not just static objects in space, but they were actually moving away from us at tremendous speeds.
This led to the development of the Hubble's law, which describes the relationship between the distance of a galaxy from us and its recession velocity. Hubble's discovery revolutionized our understanding of the universe and helped us to develop the Big Bang theory, which states that the universe began as a singularity and has been expanding ever since.
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When you throw a baseball, its de Broglie wavelength isa) the same size as the ballb) about the same size as an atomc) about the same size as an atom's nucleusd) much smaller than the size of an atom's nucleus
The de Broglie wavelength of a baseball when thrown is much smaller than the size of an atom's nucleus. This means that the wave-like behavior of the baseball is negligible compared to its particle-like behavior.
The de Broglie wavelength is a property of matter waves, which are waves that have a particle-like behavior. It is calculated by dividing Planck's constant by the momentum of the particle.
For macroscopic objects like a baseball, the momentum is high and the de Broglie wavelength is extremely small, making the wave-like behavior insignificant.
This principle is important in understanding the behavior of matter at the quantum level, where particles can exhibit both wave-like and particle-like behavior.
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If, during the second analysis, the AED prompts
"no shock advised," you should:
Check the pad placement on the
person’s chest.
Reset the AED by turning it off for 10 seconds.
Resume CPR until the AED reanalyzes or you
find an obvious sign of life.
Unplug the connector from the machine.
If, during the second analysis, the AED prompts "no shock advised," you should check the pad placement on the person's chest.
It's important to make sure the pads are properly attached and in the correct location. After confirming pad placement, you should resume CPR until the AED reanalyzes or until you find an obvious sign of life. Do not reset the AED by turning it off or unplug the connector from the machine. Keep following the AED prompts and administering CPR as necessary until emergency medical services arrive.
If, during the second analysis, the AED prompts "no shock advised," you should:
1. Check the pad placement on the person's chest to ensure proper connection and positioning.
2. Resume CPR until the AED reanalyzes or you find an obvious sign of life.
There is no need to reset the AED by turning it off or unplugging the connector, as "no shock advised" means the device has analyzed the situation and determined that a shock is not necessary at that moment. Continue following the AED prompts and providing CPR as needed.
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please help and seriously answer all questions :)) your help will be highly appreciated:)
1. What force is necessary to stretch an ideal spring with a spring constant of 125 N/m by
35 cm?
2. A spring with a spring constant of 650. N/m is used for a scale to weigh fish. What is the mass of a fish that would stretch the spring by 7.55 cm from its normal length?
3. A spring in a pogo-stick is compressed 16cm when a 43kg girl stands on it. What is the spring constant for the pogo-stick spring?
4. A spring is connected to a wall and a horizontal force of 80.0 N is applied. It stretches 28cm, what is its spring constant?
5. A spring stretches 8.0 cm when a 16 N force is applied. How far does it stretch when a 23 N is applied?
6. A 7.3 kg mass is placed on a spring with a spring constant of 36 N/cm. How much does this stretch the spring?
7. An elastic cord is 80cm long when it is supporting a mass of 15. kg hanging from it at rest. When an additional 5.0 kg is added, the cord is 82.5 cm long. What is the spring
constant?
8. What is the original length of the cord (with no mass) in question 7?
9. A spring with a spring constant of 50. N/m is hanging from a stand. A second spring with a spring constant of 100. N/m is hanging from the first spring. How far do they stretch if a 0.58 kg is hung from the bottom spring?
10. What is the spring constant of the system of springs in question 9?
please help and seriously answer all questions :)) your help will be highly appreciated:)
1. Force necessary to stretch an ideal spring with a spring constant of 125 N/m by 35 cm is 437.5 N.
2. The mass of a fish that would stretch the spring by 7.55 cm from its normal length is 5.10 kg.
3. Spring constant is 267.94 N/m.
4. Spring constant is 285.71 N/m.
5. Distance will be 0.115 m.
6. Distance will be 1.986 m.
7. Spring constant is calculated to be 183.38 N/m.
8. Original length becomes 80 cm.
9. Distance covers to be 0.1924 m.
10. Equivalent spring constant becomes 150 N/m
1. The force necessary to stretch the spring can be calculated using Hooke's law, which states that F = kx, where F is the force applied, k is the spring constant, and x is the displacement from the equilibrium position.
Thus, F = kx
F = (125 N/m)(0.35 m)
F = 43.75 N.
2. Using Hooke's law again, we have
F = kx
F = (650 N/m)(0.0755 m)
F = 49.98 N.
This force is equal to the weight of the fish, so we can find its mass by dividing by the acceleration due to gravity:
m = F/g
m = 5.10 kg.
3. We can use Hooke's law once more to find the spring constant:
k = F/x
k = (43 kg)(9.81 m/s²)/(0.16 m)
k = 267.94 N/m.
4. Hooke's law gives us k = F/x
k = (80 N)/(0.28 m)
k = 285.71 N/m.
5. We can use Hooke's law to set up a proportion: F1/x1 = F2/x2, where F1 and x1 are the initial force and displacement, and F2 and x2 are the new force and displacement. Solving for x2, we get
x2 = (F2/F1)x1
x2 = (23 N/16 N)(0.08 m)
x2 = 0.115 m.
6. Hooke's law gives us F = kx = (36 N/cm)(0.073 m) = 2.628 N. This is the force required to stretch the spring by 1 cm, so the total displacement is
x = (7.3 kg)(9.81 m/s²)/(36 N/cm)
= 1.986 m.
7. We can use Hooke's law to set up an equation: mg = kx, where m is the mass, g is the acceleration due to gravity, and x is the displacement from the equilibrium position. Solving for k, we get
k = mg/x
k = (15 kg)(9.81 m/s²)/(0.80 m)
k = 183.38 N/m.
8. The original length of the cord is simply the length when no mass is attached, so it is 80 cm.
9. The total force on the bottom spring is the sum of the weights of the two springs and the mass, so
F = (0.58 kg)(9.81 m/s²) + (50 N/m + 100 N/m)(x), where x is the displacement of the two springs together. Using Hooke's law, we can write this as F = 19.24 N + 150 x.
Setting this equal to kx and solving for x, we get
x = F/(k1 + k2)
x = (19.24 N)/(50 N/m + 100 N/m)
x = 0.1924 m.
10. The spring constant of the system of springs is simply the sum of the individual spring constants, so
k = k1 + k2
k = 50 N/m + 100 N/m
k = 150 N/m.
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The current in a single-loop circuit with one resistance R is 3.8 A. When an additional resistance of 2.0 Ω is inserted in series with R, the current drops to 2.8 A. What is R??
We can use Ohm's Law to solve this problem. Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) between them. Mathematically, Ohm's Law can be expressed as:
I = V/R
We are given the current (I) for two different circuit configurations: I1 = 3.8 A for the original circuit with resistance R, and I2 = 2.8 A for the circuit with resistance R + 2 Ω. Let's use these values to solve for R.
From Ohm's Law, we know that:
I1 = V/R
Rearranging this equation, we get:
V = I1 * R
Similarly, for the second circuit configuration, we have:
I2 = V/(R + 2)
Rearranging this equation, we get:
V = I2 * (R + 2)
Since the voltage (V) is the same in both circuits (it's the voltage supplied by the battery or power source), we can equate the two expressions for V:
I1 * R = I2 * (R + 2)
Expanding this equation, we get:
I1 * R = I2 * R + 2 * I2
Solving for R, we get:
R = 2 * I2 / (I1 - I2)
Substituting the given values, we get:
R = 2 * 2.8 A / (3.8 A - 2.8 A) = 5.6 Ω
Therefore, the value of R is 5.6 Ω.
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Meteorite On October 9, 1992, a 27-pound meteorite struck a car in Peekskill, NY, creating a dent about 22 cm deep.
A)If the initial speed of the meteorite was 540 m/s , what was the average force exerted on the meteorite by the car? Express your answer using two significant figures
The average force exerted on the meteorite by the car was about 7,200 N.
What is Force?
Force is a physical quantity that describes the interaction between objects or systems that can cause them to accelerate or deform. It is a vector quantity, which means that it has both magnitude and direction. The unit of force is the newton (N), which is defined as the amount of force required to accelerate a mass of 1 kilogram by 1 meter per second squared .
To calculate the average force exerted on the meteorite by the car, we can use the impulse-momentum theorem, which states that the impulse applied to an object is equal to its change in momentum. The impulse can be calculated as the product of the force and the time interval during which it acts, while the change in momentum can be calculated as the mass of the meteorite times its initial velocity.
The time interval during which the force acts is not given, but assuming that it is very short (on the order of milliseconds), we can use the equation:
impulse = force x time = change in momentum = mass x (final velocity - initial velocity)
Rearranging this equation to solve for the force, we get:
force = (mass x (final velocity - initial velocity)) / time
The mass of the meteorite is not given, but we can assume that it is 12.25 kg (27 pounds converted to kilograms). The final velocity of the meteorite is zero, since it comes to a complete stop after striking the car. The time interval is unknown, but we can assume that it is very short (on the order of milliseconds).
Substituting the given values into the equation, we get:
force = (12.25 kg x (0 m/s - 540 m/s)) / time
To express the answer in two significant figures, we can round the result to the nearest hundred newtons.
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what electric quantities must be kept small to transmit electric energy economically over long distances?
Answer:
P = I V = I^2 R power lost in wire
I (current) and R (resistance) need to be kept small to minimize power lost in wire - explains why very high voltages are used in power transmission
To transmit electric energy economically over long distances, it is important to keep certain electric quantities small. These include: Resistance; Current; Voltage drop; Capacitance and inductance.
Resistance: Resistance is the property of a material that opposes the flow of electric current. The higher the resistance of a material, the more energy is lost as heat when current flows through it. To minimize energy loss during transmission, it is important to keep the resistance of the transmission lines and other components as low as possible.Current: The amount of current flowing through a transmission line is directly proportional to the amount of power being transmitted. Higher currents mean higher energy losses due to resistance, so it is important to keep the current as low as possible while still transmitting the required amount of power.Voltage drop: Voltage drop is the amount of voltage lost as electric current flows through a transmission line. Higher voltage drops mean more energy losses, so it is important to keep the voltage drop as low as possible by using thicker wires and minimizing the length of the transmission lines.Capacitance and inductance: Capacitance and inductance are properties of electrical systems that can cause energy losses by storing and releasing energy as electric and magnetic fields. To minimize these losses, transmission lines are often designed with special configurations that minimize capacitance and inductance.Overall, the key to transmitting electric energy economically over long distances is to minimize energy losses by keeping electric quantities such as resistance, current, voltage drop, capacitance, and inductance as small as possible.
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what nm is the visible light spectrum at- important for test day
Answer:
Visible light is considered to be between
400 and 700 nanometers 4.00E-9 m to 7.00E-9m
Old terminology is 4000 to 7000 Angstrom units
4.00E-10 m to 7.00-10 m
a concave mirror forms a real image twice as large as the object. the object is then moved such that the new real image produced is three times the size of the object. if the image was moved 70.9 cm from its initial position, ...a) ... how far was the object moved? (if it was moved closer to the mirror, the result will be negative. if it was moved farther away from the mirror, the result will be positive).
The object was moved 46.3 cm closer to the mirror.
Let the object distance be 'u' and the image distance be 'v' for the first case where the image is twice the size of the object.
Using the mirror formula:
1/f = 1/v + 1/u
Since the mirror is concave, the focal length is negative, f = -v/2.
Plugging this into the formula gives:
-2/v = 1/v + 1/u
-3/v = 1/(v+70.9) + 1/u
Solving these two equations simultaneously, we get:
u = -46.3 cm
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true or false - when a flexible object changes its shape, the com of the object can change location.
When a flexible object changes its shape, the com of the object can change location. It is true.
The center of mass (COM) may move as the shape of a flexible item changes because of changes in the distribution of mass inside the object. For instance, if a person leans forward while standing, more of their mass is now positioned in front of their feet, which causes the COM of their body to shift forward.
Similar to this, when a spring is compressed or extended, its COM will migrate toward the stretched end since there is more mass there. It is crucial to remember that the object's overall mass remains unchanged, and the rules of momentum and energy conservation continue to hold true.
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If you are sitting in your living room and exactly 1 hour has passed according to the clock on your wall. Suddenly you see a spaceship whizzing past you at 85% of the speed of light, what will be the time measured by the person in the spaceship from the clock on your wall? A. Relativistic (dilated) time B. Proper time. C. Contracted time. D. None of the above.
The time measured by the person in the spaceship from the clock on your wall will be relativistic (dilated) time. So, the answer is A.
The concept of the theory of relativityThe theory of relativity, which states that time is relative and depends on the observer's motion and gravitational field. The faster an object moves, the slower time passes for it relative to a stationary observer.
This effect is known as time dilation. In this scenario, the spaceship is moving at 85% of the speed of light, which means time will pass slower for the person on the spaceship compared to the person sitting in the living room.
Therefore, the person on the spaceship will measure less than an hour of time on their clock, while the person in the living room will measure exactly one hour.
Proper time refers to the time measured by an object in its own rest frame, and contracted time refers to the apparent reduction in length of a moving object. Neither of these concepts are applicable in this scenario.
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if a person boils wate in a waterbottle they place a deflated ballon and heats it up on a hot pplat what will happen?
Depending on a number of variables, including the material of the water bottle, the type of balloon, the volume of water inside the bottle, and the duration and intensity of heating.
Heating a water bottle with a deflated balloon on a hot plate can produce a variety of results. It is crucial to remember that it might be risky and is not advised to use a water bottle or any other container used for storage on a hot plate. The bottle might melt or explode as a result, allowing hot water or steam to escape and possibly resulting in burns or other dangers.
The following things could happen if a water bottle with a deflated balloon inside is heated on a hot plate:
Bottle Melting: The extreme heat of the hot plate may cause the water bottle to melt or distort if it is made of plastic or another material that is not heat-resistant. The balloon may melt or fuse with the bottle as a result, which may cause the discharge of harmful gases or materials from the plastic into the air or water.
The water bottle may rupture if it is heated to the point where the pressure inside the bottle dramatically rises as a result of the water converting into steam. This may also result in the balloon bursting, releasing hot water or steam quickly, which may result in burns or other injuries.
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What are the resonant frequencies for an open organ pipe of fixed length L? (show your sketches and calculations)
The resonant frequencies for an open organ pipe of fixed length L is f = nv/2L
Resonant frequencies are those frequencies at which an object vibrates with maximum amplitude when it is set into vibration. In the case of an open organ pipe of fixed length L, the resonant frequencies can be determined using the formula f = nv/2L, where f is the frequency, n is the harmonic number, v is the speed of sound and L is the length of the pipe.
For the first harmonic, n=1, the frequency is f1= v/2L. For the second harmonic, n=2, the frequency is f2= 2v/2L = v/L. For the third harmonic, n=3, the frequency is f3= 3v/2L. Thus, the resonant frequencies of an open organ pipe of fixed length L are given by the multiples of the fundamental frequency f1.
In conclusion, the resonant frequencies of an open organ pipe of fixed length L can be determined using the formula f = nv/2L, where n is the harmonic number. The first harmonic is the fundamental frequency, and the resonant frequencies are given by multiples of the fundamental frequency. This is important to consider when designing and playing musical instruments such as organs.
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What is the cause of its many volcanic/geyser-like eruptions on the moon io?
The many volcanic and geyser-like eruptions on Jupiter's moon Io are caused by tidal forces exerted on the moon by its host planet Jupiter and the other moons in its vicinity.
The many volcanic and geyser-like eruptions on Jupiter's moon Io are caused by tidal forces exerted on the moon by its host planet Jupiter and the other moons in its vicinity.
These forces cause the moon's interior to flex and heat up, leading to volcanic activity on its surface. Additionally, Io's unique composition, with a high concentration of sulfur and other volatile materials, makes it more prone to volcanic eruptions compared to other moons in our solar system.
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The capacitance of a parallel plate capacitor is _________.
Group of answer choices
proportional to charge
proportional to the plate separation
proportional to the area of the plates
proportional to the potential difference
None of the above
The capacitance of a parallel plate capacitor is proportional to the area of the plates. Hence option C is correct.
A capacitor is a device that stores electrical energy in an electric field by collecting electric charges on two isolated surfaces. It is a passive electronic component with two terminals.
Capacitance is the effect of a capacitor. While any two electrical conductors in close proximity in a circuit have some capacitance, a capacitor is a component designed to provide capacitance to a circuit. The capacitor was initially referred to as a condenser, a word that is still used in a few compound names, such as the condenser microphone.
Capacitance of the capacitor is directly proprtional to the area of the plates and inversly proprtional to the distance between them.
C = ∈A/d
Hence option C is correct.
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Could Someone help me with these two problems please!
Question 1.
A stereo with a resistance of 65 Ω is connected across a potential difference of 140 V. What is the current in this device?
Answer :-
Resistance = 65 Ω
Potential difference = 140V
I = V/Rwhere, I denotes Current, V denotes potential difference and R denotes the resistance
substituting the values,
[tex]\: :\implies [/tex] I = 140/65
[tex]\: :\implies [/tex] I = 2.15 Ampere
Therefore, 2.15 ampere is the required current in the device.
Question 2
A 1150 W electric toaster operates on a household circuit of 100 V. What is the resistance of the wire that makes up the heating element of the toaster?
Answer :-
Power = 1150 WPotential difference = 100 VWe know that,
P = IVwhere, P denotes Power , I denotes Current and V denotes the potential difference.
Substituting the values,
[tex]\: :\implies [/tex] 1150 = I × 110
[tex]\: :\implies [/tex] 1150/100 = I
[tex]\: :\implies [/tex] 11.5 = I
Required current = 11.5 A
Now,
R = V/Iwhere, R denotes resistance, V denotes potential difference
and I denotes the Current.
Substituting the values,
[tex]\: :\implies [/tex] R = 110/1.5
[tex]\: :\implies [/tex] R = 8.69 Ω
Therefore, 8.69Ω is the required resistance of the wire that makes up the heating element of the toaster
If an explosive shell can travel 500 yards in 1.5 seconds, a shell bursts with a 25 yard diameter of damage, and it takes 3 seconds for the fuse in the shell to go off, what is the farthest away a target could be hit by a shell?
The farthest away a target could be hit by a shell is approximately 1000 yards (rounded to the nearest whole number).
To solve the problem, we need to find the total distance that the shell can travel before it bursts.
The distance that the shell can travel is:
distance = rate × time
We are given that the shell can travel 500 yards in 1.5 seconds, so its speed is:
rate = distance ÷ time = 500 yards ÷ 1.5 seconds = 333.33 yards/second
Now we need to take into account the time it takes for the fuse to go off. Since it takes 3 seconds for the fuse to go off, the shell will have traveled:
distance = rate × time = 333.33 yards/second × (1.5 seconds + 3 seconds) = 999.99 yards
Therefore, the farthest away a target could be hit by a shell is approximately 1000 yards (rounded to the nearest whole number).
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