Answers
:| mhmm
Related Questions
In order to turn a star's proper motion into its space velocity, we must also know:
its distance and mass.
its distance and radial velocity.
its mass and spectral type.
its spectral type and period of rotation.
its temperature and age.
Answers
In order to turn a star's proper motion into its space velocity, we must also know its distance and radial velocity (Option B).
Proper motion is the apparent motion of a star across the sky, and it is determined by observing the star at two different times and measuring its change in position. However, proper motion alone does not give us enough information about a star's actual motion through space. To calculate a star's space velocity, we also need to know its distance from Earth and its radial velocity, which is its motion towards or away from us along our line of sight.
Knowing a star's distance is crucial because it allows us to determine how much its proper motion is affected by our own motion around the Sun. Radial velocity is also important because it tells us whether a star is moving towards or away from us, and by how much. By combining a star's proper motion, distance, and radial velocity, we can calculate its true motion through space.
While a star's mass, spectral type, temperature, and age can provide valuable information about its physical properties and behavior, they are not directly necessary for determining its space velocity from proper motion. However, they may be used in other contexts, such as studying the dynamics of star clusters or analyzing the orbits of binary star systems.
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Fill in the blank.
_______________, not velocity, is used to calculate the average acceleration.
Answers
Answer:
speed
Explanation:
Change in velocity, not velocity, is used to calculate the average acceleration. Velocity is displacement over time.
Acceleration:
It is defined as the ratio of change in velocity to time. It is given by:
Acceleration= Change in velocity / time
a= u-v / t
where,
u= initial velocity
v= final velocity
t= time
Thus, we can conclude that a change in velocity is used to calculate average acceleration.
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A wave has a wavelength of 4.9 m and a velocity of 9.8 m/s. The medium through which this wave is traveling is then heated so that the velocity is doubled. If the frequency remains constant, what is the wavelength of the heated wave? 2.5 m 9.8 m 14.7 m 19.6 m
Answers
Answer:
the wavelength is 9.8 meters
Explanation:
We can use the relationship:
Velocity = wavelenght*frequency.
Initially we have:
wavelenght = 4.9m
velocity = 9.8m/s
then:
9.8m/s = 4.9m*f
f = 9.8m/s/4.9m = 2*1/s
now, if the velocity is doubled and the frequency remains the same, we have:
2*9.8m/s = wavelenght*2*1/s
wavelenght = (2*9.8m/s)*(1/2)s = 9.8 m
Answer:
9.8
Explanation:
In the simulation, start with m1 = 200 kg and m, = 400 kg with their centers 8 meters apart. If you want to increase in the gravitational force between the two masses by the greatest amount, should you double the mass of m, or should you halve the distance sentences, explain which option would create the greater increase in the gravitational force and why. (2 points)
Answers
To double the gravitational force between the two blocks, double the mass of the blocks and keep the distance between constant.
The given parameters;
mass of the first block, m₁ = 200 kgmass of the second block, = 400 kgcenter mass of the blocks, r = 8 mThe gravitational force between the two mass is calculated by applying Newton's law of universal gravitation as follows;
\(F = \frac{Gm_1 m_2}{r^2}\)
The magnitude of the gravitational force increases with increase in the mass of the blocks and decreases with increase in the distance between the blocks.
To double the gravitational force between the blocks, double the mass of the blocks;
\(F = \frac{G(2m_1)(2m_2)}{r^2} \\\\F = 2 \times \frac{Gm_1 m_2}{r^2}\)
Thus, to double the gravitational force between the two blocks, double the mass of the blocks and keep the distance between constant.
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pls I will give brainliest for correct answer
find the distance travelled im the first 8 hours
Answers
Answer
I think it is 112 havent done this in a while but im pretty sure thats it Good luck
Explanation:
Volume of 10 coin is 25ml what is the volume of 1 coin
Answers
Answer: 2.5 ML
Explanation:
10 ÷ 10 = 1
25 ÷ 10 = 2.5
The volume of 1 coin is 2.5 ML
Using newton’s third law Why am I able to walk for
ward
Answers
Answer:
See the explanation below.
Explanation:
Newton's third law states that any force applied to a body generates a reaction equal and in opposite direction to the original Force.
In order to better understand how a person's movement is generated when walking, we will analyze the attached image below, where we see the forces acting.
The red vector goes in the direction of the person's movement, this force vector pushes the person to move forward.
A vector is any quantity that has no units of measurement
Answers
False. Velocity is a vector and is measured in m/s (in SI, anyway).
in a paragraph explain how electncity is generated at a power plant. please don't answer if you don't know
Answers
Answer:
A turbine spins to generate electricity. There are many ways to spin the turbine by using water, steam, nuclear and so on.
The current shown in part a below is increasing, whereas that shown in part b is decreasing. In each case, determine which end of the inductor is at the higher potential 0000_ I(O) I(t) part a Select ? part b Select ?
Answers
In physics, current refers to the flow of electric charge through a conducting medium, such as a wire. The answers are:
a) The end of the inductor connected to the positive terminal of the power supply or the source will be at a higher potential.
b) The end of the inductor connected to the negative terminal of the power supply or the source will be at a higher potential.
Electric current can be visualized as the movement of charged particles, typically electrons, in a circuit. When there is a potential difference, or voltage, applied across a conductor, such as a battery connected to a wire, the electric charges are pushed by the voltage and begin to flow. This flow of charges constitutes an electric current.
In part (a), where the current is increasing, the end of the inductor at the higher potential can be determined using Lenz's law. Lenz's law states that the induced electromotive force (EMF) in an inductor opposes the change in current through it.
When the current is increasing, the induced EMF in the inductor will try to oppose this increase. To achieve that, the end of the inductor where the potential is higher will be the one that is connected to the positive terminal of the power supply or the source driving the current.
Therefore, in part (a), the end of the inductor connected to the positive terminal of the power supply or the source will be at a higher potential.
In part (b) of the question, where the current is decreasing, the end of the inductor at the higher potential can be determined using the same logic. The induced EMF in the inductor will try to oppose the decrease in current. Consequently, the end of the inductor connected to the negative terminal of the power supply or the source will be at a higher potential.
Therefore, in part (b), the end of the inductor connected to the negative terminal of the power supply or the source will be at a higher potential.
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Just a Spider Bite? Antimicrobial Resistance and Susceptibility
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Resistance to antibiotics (A Antimicrobial resistance (AMR) is the capacity of microorganisms (such as bacteria, viruses, and fungi) to withstand the effects of antimicrobial medications, increasing the difficulty of treating infections.
AMR causes extended sickness, higher healthcare expenditures, and a higher risk of death, hence it is an increasing public health concern.
A microorganism's sensitivity to antimicrobial medications is influenced by a number of variables, including its genetic make-up, the presence of resistance genes, and the use of antibiotics. It is advised to employ suitable infection control techniques, limit the use of antibiotics, and encourage good hygiene in order to reduce AMR.
Antimicrobial drug resistance (MR) is the capacity of microorganisms (such as bacteria, viruses, and fungi) to withstand the effects of these medications, making infections more challenging to cure. A growing public health issue is AMR.
AMR is a worldwide issue that has an impact on people of all ages, genders, and nationalities. It is brought on by a number of things, such as the overuse and abuse of antibiotics, poor hygiene habits, and the transmission of resistant microbial strains through international trade and travel. The development of bacteria and other microbes, which can become resistant to antibiotics through genetic mutation and horizontal gene transfer, is another factor that contributes to AMR.
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You are playing tennis and return a volley. Identify a force pair.
Answers
During a tennis volley, the force pair involved is the action-reaction forces.
When playing tennis and returning a volley, the force pair involved is the action and reaction forces. In the process of hitting the ball, the tennis racket exerts a force on the ball, which is the action force.
The ball, in turn, exerts an equal and opposite force on the racket, which is the reaction force.Both the racket and the ball experience the force of impact during the volley.
The force applied by the racket causes the ball to move forward, while the equal and opposite force applied by the ball pushes the racket back.
These two forces are referred to as action-reaction forces or force pairs. A force pair refers to a pair of forces that are equal in magnitude but opposite in direction.
These forces always act on different objects and occur simultaneously. In this scenario, the action force was exerted by the tennis racket while the reaction force was exerted by the ball.
Therefore, during a tennis volley, the force pair involved is the action-reaction forces.
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PLEASE ANSWER ASAP!
Lai is trying to listen to a radio station for weather updates during a storm. The storm is causing electrical interference that affects radio waves. She knows that the weather station broadcasts both an analog and a digital radio signal.
Which signal would most likely be clearer during this storm, and how do you know?
(Choice A)
The analog signal because it can always be heard even when interference is high.
(Choice B)
The analog signal because interference can be filtered out of the signal.
(Choice C)
The digital signal because it can always be heard even when interference is high.
(Choice D)
The digital signal because interference can be filtered out of the signal.
Answers
The digital signal can always be always be heard even when interference is high. Option D
What is a radio signal?A radio signal makes use of the radio waves. The radio waves are long wavelength electromagnetic waves which are able to travel across a long distance. The signal can be transmitted in both analogue and digital formats.
However, the digital signal seems to be free from certain interferences that are caused by the scattering of the waves across distances. This could diminish the quality of sound that is heard.
Thus, the digital signal can always be always be heard even when interference is high.
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QUESTION 30 A tennis ball moves back and forth 10 times in 5 sec. The frequency of its motion is
Answers
Answer:
so in 1 sec 2 times
so frequency = 2
Explanation:
What is the porosity of the gravel sample?(the sediment volume for each sample is 400ml.) a. 23.75% b. 28.75% c. 55.75% d. 81.75% please select the best answer from the choices provided a b c d
Answers
d. 81.75% is the porosity of the gravel sample.
How porous is the sediment in the sand sample?According to an examination of published data, the average sand porosity for packed, natural (in situ), and loose packing conditions, respectively, over a range of sorting coefficients and grain sizes, was found to be 37.7%, 42.3%, and 46.3%.
Clay is the least permeable sediment while having the greatest pores. Water movement is typically impeded by clay, which functions as an aquitard. The porous and permeable qualities of gravel and sand make them suitable materials for aquifers. The most permeable substance is gravel.
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a transverse wave of amplitude 3.0 cm , frequency 5.0 hz , and speed 3.0 m/s travels on an infinitely long slinky. part a how far apart are the two nearest points on the slinky that at one particular time both have the maximum magnitudes of displacements from their equilibrium positions? express your answer with the appropriate units.
Answers
Part A: 6.0 cm apart are the two nearest points on the slinky that at one particular time both have the maximum magnitudes of displacements from their equilibrium positions.
Part B: The period of the wave is 0.2 seconds.
A transverse wave of amplitude 3.0 cm, frequency 5.0 Hz, and speed 3.0 m/s travels on an infinitely long slinky. This question is a two-part question.
Let us solve each part of the question.
Part A:
We know that transverse waves move up and down perpendicular to the direction of the wave. It means that the maximum displacement of a particle from its equilibrium position is equal to the amplitude of the wave.
In one period (T), the wave completes one full cycle. The number of cycles completed in one second is called the frequency (f) of the wave.
The product of wavelength (λ) and frequency (f) of the wave is equal to its velocity (v).
The formula for a wave is given as follows:v = λf
Here, v is the velocity, λ is the wavelength and f is the frequency.
From the formula, we can calculate the wavelength of the wave. We are given the amplitude (A) and frequency (f) of the wave. We are to find the distance between two nearest points at maximum displacement.
To solve the problem, we use the formula for the wavelength of a wave.
λ = v/f
Substituting the values given:
λ = (3.0 m/s)/(5.0 Hz)
λ = 0.6 m
We know that for a transverse wave, maximum displacement is equal to the amplitude.
Therefore, the distance between two nearest points at maximum displacement is equal to two times the amplitude.
Substituting the value:
Distance between two nearest points at maximum displacement = 2 x amplitude= 2 x 3.0 cm = 6.0 cm
Part B:
The period of the wave is the time it takes for a complete cycle. The formula for the period is given as follows:
T = 1/f
Substituting the values:
T = 1/5.0 Hz
T = 0.2 seconds
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What is the difference between the geographic North Pole and the magnetic north pole?
Answers
Answer:
Magnetic north is the direction towards the north magnetic pole, which is a wandering point where the Earth's magnetic field goes vertically down into the planet
Explanation:
I searched it up lol
A 30 kg child is in an elevator accelerating down at a rate of -5 m/s2.
a. Calculate the force of gravity on the child.
Answers
Answer:
The force is - 150 N
Explanation:
F = 30 • - 5 = - 150
A river that is 60.0 m wide flows due east with a speed of 3.00 m/s. A man steers a motorboat across the river. The velocity of the boat relative to the water is 4.0 m/s due north. When the boat reaches the opposite bank. how far east is the hoat from its starting point?
Answers
The boat will be approximately 50.2 meters east from its starting point.
To find the distance east of the boat from its starting point, we need to consider the combined effect of the river's flow and the boat's velocity. The river's width and speed, along with the boat's velocity relative to the water, will influence the boat's path.
First, we calculate the time it takes for the boat to cross the river. Since the river is 60.0 meters wide and the boat's velocity relative to the water is 4.0 m/s, the boat will take 60.0 m / 4.0 m/s = 15.0 seconds to cross the river.
Next, we determine the displacement caused by the river's flow during the time it takes for the boat to cross. The river flows due east with a speed of 3.00 m/s, so the displacement is given by 15.0 seconds * 3.00 m/s = 45.0 meters.
Finally, we find the eastward distance traveled by the boat. Since the boat's displacement due north is equal to the river's displacement, and the boat's displacement due east is its actual displacement, we use the Pythagorean theorem. The boat's eastward distance is then √[(60.0 m)²- (45.0 m)²] = 50.2 meters.
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How much force is needed to make a 225 kg object accelerate at a rate of 2.5 m/s²?
Answers
F=ma using formula and solve your question
A
heat engine is measured to have 30% efficiency. Is the theoretical
efficiency going to be greater or less than that? Why?
Answers
The theoretical efficiency is greater than that of the actual efficiency of the engine. This is because heat engine always produces some waste heat.
The Second Law of Thermodynamics states that a heat engine cannot be 100% efficient. In practice, a heat engine is only 100% efficient when it is operating at about 30-50% efficiency.
If we were to multiply this by 100, we would get the efficiency as a percent: 49%. This is the theoretical maximum efficiency. If we were to actually build an engine, it would be less efficient than the theoretical engine. The theoretical engine that can achieve this theoretical maximum efficiency is called the Carnot Engine.
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suppose that requiring motorcycle riders to wear helmets reduces the probability of a motorcycle fatality from 0.3 percent to 0.2 percent over the lifetime of a motorcycle rider and that the cost of a lifetime supply of helmets is $500. it is efficient for the government to require riders to wear helmets if human life is valued at
Answers
The human life valuation based on the information is E. $500000 or more.
What is the human life valuation?It was illustrated that the motorcycle riders to wear helmets reduces the probability of a motorcycle fatality from 0.3 percent to 0.2 percent over the lifetime of a motorcycle rider.
Probability is the occurence of likely events. It is the area of mathematics that deals with numerical estimates of the likelihood that an event will occur or that a statement is true.
Since the cost of a lifetime supply of helmets is $500, the lifetime human life = = 500 / (0.3 - 0.2) × 100
= 500 / 0.1 × 100
= 5000 × 100
= 500000
The correct option is E.
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Complete question
Suppose that requiring motorcycle riders to wear helmets reduces the probability of a motorcycle fatality from 0.3 percent to 0.2 percent over the lifetime of a motorcycle rider and that the cost of a lifetime supply of helmets is $500. it is efficient for the government to require riders to wear helmets if human life is valued at:
A. $100 or more.
B. $150 or more
C. $500 or more.
D. $50000 or more.
E. $500000 or more.
thermoelectric thermometer
Answers
Answer:
Thermocouple, also called thermal junction, thermoelectric thermometer, or thermel, a temperature-measuring device consisting of two wires of different metals joined at each end. One junction is placed where the temperature is to be measured, and the other is kept at a constant lower temperature.
Nuclear energy is currently used in which three kinds of vehicles?
A. cars, submarines, spacecraft
B. submarines, ships, spacecraft
C. spacecraft, airplanes, cars
D. airplanes, submarines, ships
Answers
Answer:
d
Explanation:
An XLPE medium voltage underground cable, 63 kV, with regular twisted conductors with 5 different layers with a cross-sectional area of 700 mm2 with a length of 1 km is available. Its DC resistance at 90 ° C (0.02 / km), its skin effect coefficient is 0.1, its proximity effect coefficient is 1 and dc / s = 1. A) Calculate the number of cable conductors. B) What is the ratio of AC resistance to DC resistance of the cable?
Answers
XLPE medium voltage underground cable, 63 kV, with regular twisted conductors with 5 different layers with a cross-sectional area of 700 mm2 with a length of 1 km is available. DC resistance at 90 ° C (0.02 / km)Skin effect coefficient is 0.1Proximity effect coefficient is 1DC/s = 1.
A) Calculation of the number of cable conductors The total cross-sectional area of the cable is `5 × 700 = 3500 mm²`Converting it to m²: `3500/1,000,000 = 0.0035 m²`The diameter of the conductor can be calculated as follows: `A = πd²/4 ⇒
d = √(4A/π)`Putting in the values: `d = √(4 × 0.0035/π) = 0.0211 m = 21.1 mm`Cross-sectional area of the conductor `= πd²/4
= π × 0.0211²/4
= 0.00035 m²`The area of one conductor
`= 1 × 0.00035
= 0.00035 m²`The number of conductors
`= Total cross-sectional area of the cable/Area of one conductor 'Substituting the given values: `Number of conductors = 0.0035/0.00035 = 10`Therefore, there are 10 conductors in the cable.
B) Calculation of the ratio of AC resistance to DC resistance of the cable We know that; `Rac = Rdc × f(Ke + Kp)`Where, Rac = AC resistance of the conductor
Rdc = DC resistance of the conductor
= frequency Ke
= Skin effect coefficientKp
= Proximity effect coefficient Here, `f(Ke + Kp)
= 0.1 + 1
= 1.1`Therefore, the AC resistance of the conductor is;`
Rac = 0.02 × 1.1
= 0.022 Ω/km` The ratio of AC resistance to DC resistance of the cable;`Rac/Rdc
= 0.022/0.02
= 1.1/1
= 1.1`Therefore, the ratio of AC resistance to DC resistance of the cable is 1.1.
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what state in the us tried to pass a law to legislate the value of pi
Answers
Answer: The fact is, there's only one known case in American history where someone actually tried to get his state legislature to redefine the value of pi. It happened in Indiana in 1897, and it had nothing to do with biblical values or building children's self-esteem through exactitude.
star a is three times closer to earth than star b, yet both stars appear equally bright in the sky. how do the luminosities of stars a and b compare?
Answers
The brightness of stars A is four times greater than that of stars B, is the correct response.
Because the flux (F) generated by a source of light is directly proportional to its brightness (L) and decreases inversely with its distance (d), if two stars have the same flux, then separating similar terms results in or 4·L₁ = L₂
The luminosity of star A is four times more than that of star B. The luminosity is defined as the characteristic or state of being luminous, the relative quantity of light, or the degree to which light of a certain wavelength causes the perception of brightness.
Luminosity, which is essentially measured in joules per second or watts in SI units, refers to the total energy generated by various celestial bodies (stars, galaxies) per unit time.
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on which factor does the inertia of rest depends
Answers
Answer:
Inertia depends upon the force applied .
which of the following does pca say kids need to have a meaningful experience as an athlete? (select all correct answers)
Answers
According to Positive Coaching Alliance (PCA), kids need the following elements to have a meaningful experience as an athlete: positive reinforcement, a supportive environment, skill development, and enjoyable participation.
These factors contribute to the overall development, enjoyment, and motivation of young athletes.
Positive Coaching Alliance emphasizes several key elements that are important for creating a meaningful experience for young athletes. Firstly, positive reinforcement plays a vital role in building confidence and motivation. Encouragement and recognition of effort and improvement can boost athletes' self-esteem and drive to excel.
Secondly, a supportive environment is crucial. Coaches, parents, and teammates should provide emotional support, constructive feedback, and foster a culture of respect, inclusivity, and teamwork. This environment encourages athletes to develop both as individuals and as part of a team.
Thirdly, skill development is essential. Kids should be given opportunities to learn and improve their athletic abilities. Coaches and mentors should provide appropriate training, guidance, and resources to help athletes enhance their skills, knowledge, and understanding of the sport.
Lastly, enjoyable participation is emphasized. Kids should have fun and enjoy the sports they engage in. PCA believes that a positive and enjoyable experience promotes long-term participation, love for the game, and overall well-being of young athletes.
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a body falls freely from rest.calculate it's acceleration
Answers
Answer:
10 m/s²
Explanation:
Since the body is falling freely from the rest, it will be having an acceleration equal to the acceleration due to gravity.
∴ Acceleration = g = 9.8 m/s². ≈ 10 m/s².
Answer:
10 m/s^2 I hope it helps u a lot