The star is moving toward the earth.
It is due to the phenomenon of the Doppler shift.
The Doppler effect, commonly referred to as "Doppler shift," is the change in the wavelength or frequency of waves as a result of an observer's motion in relation to the wave source.
It is possible to see this apparent wavelength change in the visible light emitted by stars and galaxies.
As a result, a star moving toward Earth appears to emit light with a shorter wavelength than a light source that is stationary. It is known as blueshift because shorter wavelengths cause the spectrum to shift toward the blue end.
While a star traveling away from us appears to shift its light towards longer wavelengths. Astronomers refer to this as redshift since it is closer to the red end of the spectrum.
As the spectrum of a particular star shows the hydrogen line appearing at a shorter wavelength of 480 nm in comparison to the laboratory measurements, that show the same hydrogen lines at a greater wavelength of 500 nanometers, that’s why we conclude that the star is moving toward earth.
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the box with the changing data shows that the acceleration is constant at 4.90 m/s2, but i thought g = 9.80 m/s2. how is this possible?
The box with the changing data shows that the acceleration is constant at 4.90 m/s2, but i thought g = 9.80 m/s2.
The acceleration due to gravity (g) is different from the acceleration of the object itself. Although g is usually taken to be 9.8 m/s2, it can vary depending on the object's location and height above the Earth's surface. As a result, a falling object can experience acceleration greater than, less than, or equal to g when air resistance is taken into account or not
In the given scenario, the box is not necessarily in free fall; it could be undergoing linear motion along a surface. Furthermore, the box could be in free fall, but with air resistance affecting its motion. In this situation, the box's acceleration would be less than g.The box's acceleration may have been determined using an accelerometer or a ticker tape. Regardless, the acceleration indicates the rate at which the box's velocity is changing, which may or may not be equal to g.
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what is the total work wfric done on the block by the force of friction as the black moves a distance l up the incline
The total work done by the force of friction on the block as it moves a distance L up the incline is given by the formula:
Wfric = −f × L
The work done by the force of friction on the block as it moves a distance L up the incline is equal to the product of the force of friction and the distance moved. Work is the measure of the amount of energy transferred by a force when an object is moved a certain distance. If a force acts on an object and the object moves, work is done by the force. Therefore, work can be defined as the product of force and displacement.
Mathematically, it can be expressed as follows:
W = F × S
where W is work, F is force, and S is displacement. The SI unit of work is joules (J). When a block moves on an inclined plane, friction is one of the forces acting on the block. As the block moves up the plane, the force of friction acts opposite to the direction of motion of the block. Hence, the work done by the force of friction is negative. This means that the force of friction acts to decrease the energy of the block.
The work done by the force of friction on the block as it moves a distance L up the incline is given by the formula:
Wfric = −f × L
where Wfric is the work done by the force of friction, f is the force of friction, and L is the distance moved by the block up the incline. Therefore, the total work done by the force of friction on the block as it moves a distance L up the incline is given by the formula:
Wfric = −f × L
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Click to review the online content. Then answer the question(s) below, using complete sentences. Scroll down to view additional questions. "Ethics in Research" What ethical issues have been raised by the scientific community's commitment to ensuring that experimental treatments are not used on patients?
Answer:
The major ethical issues in leading examination are: an) Informed assent, b) Beneficence-Do not hurt c) Respect for obscurity and secrecy d) Respect for security.
Explanation:
The major ethical issues in leading examination are: an) Informed assent, b) Beneficence-Do not hurt c) Respect for obscurity and secrecy d) Respect for security.
There are a few reasons why it is essential to stick to ethical norms in research. To start with, standards advance the points of exploration, for example, information, truth, and shirking of blunder. For instance, preclusions against creating, adulterating, or distorting research information advance reality and limit mistake.
Answer:
The topic of experimental testing on humans causes for some ethical debate. As the article states, there are regulations and laws behind what medicines doctors can and can not prescribe: and, furthermore, pharmaceutical companies are required to provide evidence in regards to what their drug does and what the side effects consist of. Though this can strike a person as ideal, there are certain scenarios to consider: such as a patient in need of urgent, immediate care who can not be assisted by current available medicines. If the patient in question desires to branch out and be a "lab rat" so to speak, is it so wrong to allow that? This is the ethical issue.
Explanation:
The answer above is the one I used to get 100, however: know for yourself this is not always the case in real life. Drugs approved by the pharmaceutical industry can be known to be a bit dicey.
How much heat is required to convert 500g of liquid water at 28°C into steam at 150 °C? Take the specific heat capacity of water to be 4183 J/Kg °C and the latent heat of vaporization to be 2.26 × 10^6 J/Kg.
Answer:
Q = 1.404 × 10^(5) KJ
Explanation:
We are given:
Mass;m = 500 g = 0.5kg
Temperature 1;T1 = 28 °C
Temperature:T2 = 150 °C
Specific heat capacity;c_p = 4183 J/Kg °C
Latent heat of vaporization;L = 2.26 × 10^(6) J/Kg.
The heat energy needed is given by;
Q = sensible heat energy + Latent heat
Formula for sensible heat is;
Sensible heat energy = mc(t2 - t1)
Formula for Latent heat is ;
Latent heat = mL
Thus:
Q = mc(t2 - t1) + mL
Q = m[c(t2 - t1) + L]
Q = 0.5((4183(159 - 28) + (2.26 × 10^(6)))
Q = 1.404 × 10^(8) J = 1.404 × 10^(5) KJ
how do combination lens systems, such as compound microscopes and refracting telescopes, operate?
The combination of the compound microscopes and refracting telescopes, operate by magnifying the image.
How do they operate?High levels of magnification are produced by the objective lens and eyepiece lens working together. Multiplying the objective lens' and the eyepiece lens' individual magnifications yields the microscope's overall magnification.
In a refracting telescope, the objective lens and eyepiece lens work together to produce high magnification, which makes distant objects look larger and more distinct to the spectator.
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Which of the following is NOT required to maintain healthy soil? Maintaining soil water levels, Maintaining aeration, Maintaining organic matter content, Maintaining diverse microbial communities
Answer: Which of the following is NOT required to maintain healthy soil?
Maintaining soil water levels
Maintaining aeration
Maintaining organic matter content
Maintaining diverse microbial communities
ANSWER: A
To maintain healthy soil we need not to maintaining soil water levels.
What is healthy soil?When a soil performs its range of ecological tasks in an adequate manner for its surroundings, it is said to be in good health. In more everyday language, the health of soil results from the harmonious interactions of all soil constituents, such as bacteria, plants, and animals. Aggregates in healthy soil help it stick together and resist runoff and erosion. Plants survive better in droughts because it can hold more water. It has more bacteria and fungi, which aid plants in warding against pests and disease.
Add organic matter.Incorporate compost to compacted soil to increase air, water and nutrients for plants.Protect topsoil with mulch or cover crops.Don't use chemicals unless there's no alternative.Rotate cropsTo maintain healthy soil we need not to maintaining soil water levels.
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Particles of light are known as A. electrons. B. neutrinos. C. photons. D. bosons.
Answer:
C. photons
hope this helps
have a good day :)
Explanation:
Answer:
The answer would be c
Explanation:
2. Think about an activity you may have learned that involves muscle memory. Consider when you first learned the activity, how easy or difficult it was the first time, and if you can do it now without thinking. What happened in your brain during practices that resulted in muscle memory for you?
Answer:
Muscle memory is found in many everyday activities that become automatic and improve with practice, such as riding bicycles, driving motor vehicles, playing ball sports, typing on keyboards, entering PINs, playing musical instruments, poker, martial arts, and dancing.
Explanation:
Which of the following demonstrates a chemical change? (1 point)
O steam condensing on a mirror
Odry ice vaporizing
O sugar and water mixing to create sugar water
iron (Fe) reacting to water((H₂O)) and oxygen(O) to form iron oxide(Fe2O3)
Answer:
"The process in which iron (Fe) is reacting to water (H2O) and oxygen (O) to form iron oxide (Fe2O3) is a perfect demonstration of a chemical change."
________________________________________________________
What is Chemical Change?"A chemical change occurs when one chemical substance is transformed into one or more different substances, for instance how iron becomes rust after a chemical change. In this situation, there is a chemical change occurring, transforming a chemical substance (iron) into iron oxide due to the reaction when combined with that of water and oxygen. Hence, the best demonstration of chemical change out of the listed situations above would be Option D."
Hope this helps! If so, please lmk! Thanks and good luck!
Chemical transitions, commonly referred to as chemical reactions, are processes that change one or more chemicals into one or more brand-new, distinct substances. The correct option is D.
A chemical change is the transformation of one substance into another, the emergence of new compounds with distinct properties, or any combination of these. It happens when two compounds unite to create a new substance (synthesis) or when two substances break down to create new substances.
Iron, oxygen, and water react to form rust as a result. Iron oxide is also referred to as rust. The chemical reaction is shown graphically as 4Fe (s), 3O₂ (g) → 2Fe₂O₃ + H₂O (l).
Thus the correct option is D.
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A device that measures absolute air pressure is called a a.manometer b. barometer c. thermometer d. tire gauge
Weather forecasts are made using barometers. An air pressure gauge, or barometer When the barometer reads "rising," the air pressure is rising; when it reads "falling," the air pressure is lowering.
What does barometric mean?Barometric pressure, to put it simply, is the measurement of air pressure in the atmosphere, more particularly, the measurement of the weight exerted by air molecules at a certain location on Earth.
The usage of a barometer:barometer, a tool for calculating atmospheric pressure. A barometer may also be used to determine height since air pressure varies with elevation above or below sea level. Mercury and aneroid barometers are the two primary varieties.
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Help quickly…
As a person travels due east, the altitude of the North Star
(1) decreases
(2) increases
(3) remains the same
East or west: it remains the same.
North: it increases.
South: it decreases.
At the North pole: it's straight up over your head.
At the equator: it's on the horizon, north of you.
South of the equator: it's below the horizon and you can't see it at all.
In the paralleling technique, the central ray of the x-ray beam must be _____ to the film sensor and the long axis of the tooth.
The film sensor and the long axis of the tooth must be aligned perpendicular to the central ray of the x-ray beam when using the paralleling approach.
To find the answer, we need to know above the paralleling technique in the dental x-ray.
What is paralleling technique?The paralleling technique is the most dependable method for capturing periapical x-rays because it produces high-quality images with little distortion. The central x-ray beam should be pointed perpendicular to the long axis of the tooth in issue, and the film should be positioned parallel to it.The paralleling technique is the most dependable method for capturing periapical x-rays because it produces high-quality images with little distortion.The central x-ray beam should be pointed perpendicular to the long axis of the tooth in issue, and the film should be positioned parallel to it.When preparing for an x-ray, it is imperative to keep in mind the root anatomy.The maxillary occlusal plane of the patient should also be parallel to the ground.Thus, we can conclude that, the film sensor and the long axis of the tooth must be aligned perpendicular to the central ray of the x-ray beam when using the paralleling approach.
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work done by a gravitational force by lowering the bucket into the well is
Answer:
when we lower a bucket into a well to fetch water, the work done by gravity is positive since force and displacement are in the same direction.
Explanation:
an electric dipole consisting of charges of magnitude 3.60 nC separated by 7.50 um is in an electric field of strength 1370 N/C.(a) Find the magnitude of the electric dipole moment.
(a) Find the magnitude of the electric dipole moment.
(b) Find the difference between the potential energies for dipole orientations parallel and antiparallel to →E
.
(a) The magnitude of the electric dipole moment is 0.0270 pC m
(b) The difference between the potential energies for the two orientations is 7.38 mJ and U_antiparallel is -3.69 mJ.
(a) The magnitude of the electric dipole moment can be calculated using the formula:
p = q * d
where q is the magnitude of each charge and d is the separation between the charges. Plugging in the values, we get:
p = 3.60 nC * 7.50 * 10^-6 m = 0.0270 pC m
(b) The difference between the potential energies for the two orientations can be calculated using the formula:
ΔU = p * E
where p is the electric dipole moment and E is the electric field strength. The potential energy is proportional to the dot product of the electric dipole moment and the electric field. So when the dipole moment is parallel to the electric field, the potential energy is at a maximum, and when it's antiparallel, the potential energy is at a minimum.
For the orientation parallel to the electric field:
U_parallel = p * E = 0.0270 pC m * 1370 N/C = 3.69 mJ
For the orientation antiparallel to the electric field:
U_antiparallel = -p * E = -0.0270 pC m * 1370 N/C = -3.69 mJ
The difference between the two potential energies is:
ΔU = U_parallel - U_antiparallel = 3.69 mJ - (-3.69 mJ) = 7.38 mJ
So the difference in potential energy between the two orientations is 7.38 mJ.
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6. A cyclist travels at a constant velocity of 2.3 m/s westward and continues at this
velocity for 60 seconds. Then, the cyclist speeds up to a velocity of 4.5 m/s and stays at
this velocity for another 60 seconds. Calculate the cyclist's acceleration.
Answer:
0.02 m/s^2
Explanation:
acceleration= change in velocity/change in time
change in velocity= 4.5m/s - 2.3m/s = 2.2 m/s
acceleration= 2.2/120= 0.0183
= 0.02 (to 2 significant figures)
Which material most likely gets the warmest when placed in the Sun?A)white cementB)beige sandC)brown mulchD)yellow pebbles
Answer: the material that is most likely to get the warmest when placed in the Sun is yellow pebbles. Therefore correct option is D.
Explanation:
The material that is most likely to get the warmest when placed in the Sun is D) yellow pebbles.
This is because the color of a material affects how much sunlight it absorbs. Darker colors tend to absorb more light and heat than lighter colors, which reflect more light. Yellow is a relatively dark color, so yellow pebbles will absorb more sunlight and get warmer than the other options.
White cement and beige sand are lighter colors, so they will reflect more sunlight and absorb less heat. Brown mulch is a darker color than cement and sand, but still not as dark as yellow pebbles, so it will absorb less sunlight and heat than yellow pebbles.
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STT 7 As an audio CD plays, the frequency at which the disk spins changed. At 210 rpm, the speed of a point on the outside edge of the disk is 1.3 m/s. At 420 rpm, the speed of a point on the outside edge is a 1.3 m/sB 2.6 m/sC 3.9 m/sD 5.2 m/s
In an audio CD plays, the frequency at which the disk spins changed. At 210 rpm, the speed of a point on the outside edge of the disk is 1.3 m/s. At 420 rpm, the speed of a point on the outside edge is option (B) 2.6 m/s.
The speed of a point on the outside edge of the disk is directly proportional to the angular speed of the disk, which is given in terms of revolutions per minute (rpm).
Let v be the speed of a point on the outside edge of the disk in meters per second (m/s), ω be the angular speed of the disk in radians per second (rad/s), and r be the radius of the disk in meters (m).
The formula relating these quantities is:
v = ωr
We can convert the given speeds from rpm to rad/s using the conversion factor of 2π radians per revolution.
At 210 rpm, ω = 210 rpm x (2π rad/1 rev) / (60 s/1 min) = 22π rad/s
At 420 rpm, ω = 420 rpm x (2π rad/1 rev) / (60 s/1 min) = 44π rad/s
Since the radius of the disk is constant, we can use the formula v = ωr to calculate the new speed:
v = ωr = (44π rad/s)(r) = 2(22π)(r) m/s
Therefore, the speed of a point on the outside edge of the disk at 420 rpm is 2 times the speed at 210 rpm, or:
v = 2(1.3 m/s) = 2.6 m/s
Therefore, the answer is B) 2.6 m/s.
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_________ is stored energy.
(A) Potential
(B) Kinetic
(C) None of the above
(D) All of the above
Answer:
I think so is b kinetic o a potential
2. A go-cart travels once around a circular track with a radius of 200m. What is its
displacement?
A)200 m
B)1256.64 m
C)100 m
D)0 m
Answer:
ggggggg
Explanation:
The dense core of Earth is thought to consist predominantly of ________.
a. copper
b. nickel
c. lead
d. iron
Option d is Correct. There is a theory that iron makes up a sizable portion of the Earth's thick core.
The outer core is made of liquid iron and nickel and is around 1,367 miles (2,200 km) thick. The outer core's temperature ranges from 8,132 to 9,932 degrees Fahrenheit (4,500 degrees C and 5,500 degrees C). The most common material used to construct earthquake-resistant buildings is steel, which is necessary for developing a structure that can withstand seismic waves.
The World Steel Association claims that because ductile structures disperse seismic wave energy, they are safer. The Earth's inner core contains even more metal than the outer core. Both are primarily comprised of iron with a small amount of nickel. However, lighter elements like oxygen, carbon, and silicon are also assumed to be present in small amounts in the iron.
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The driver of a car traveling at a speed of 27 m/s slams on the brakes and comes to a stop in 3 s. If we assume that the speed changed at a constant rate (constant net force), what was the average speed during this 3 s interval
Answer:
Average speed = 13.5 m/s
Explanation:
Since the car is running at a speed of 27 m/s and it stops after 3 seconds by applying the brake. Therefore, the initial speed of the 27 m/s and final speed is 0.
Use below formula to find the average speed :
Average speed = (Initial speed + final speed ) / 2
Average speed = (27 + 0 ) / 2
Average speed = 13.5 m/s
8. While taking a measurement, Ajay put the 2nd mark of the scale to the edge of the line and the mark that pointed to the end of the line was 80 cm. What is the total length of the line? Write the length of line in meter also.
Answer:
The length of line is 78 cm or 0.78 m.
Explanation:
initial reading 2 mark
final reading 80 cm
The length of the line
= final reading - initial reading
= 80 - 2
= 78 cm
1 cm = 0.01 m
So, 78 cm = 0.78 m
a) The speed of a motor supplied with a voltage input of 30V, assuming the system is without damping, can be expressed as: 30 = (0.02)+(0.06)w dt If the initial speed is zero and a step size of h = 0.
Using Runge-Kutta 2nd order Heun's method, the speed (w) at t = 0.8s is approximately 0.0081.
Given:
Voltage input (V) = 30V
Initial speed (w) = 0
Step size (h) = 0.4s
Time at which speed is to be determined (t) = 0.8s
We need to determine the speed (w) at t = 0.8s using Heun's method.
We have k₁ = f(t₁, W₁) = 0.02 + 0.06w₁ (using the given equation)
At t = 0 and w = 0 (initial conditions), we have:
k₁ = 0.02 + 0.06(0) = 0.02
We have k₂ = f(t₁ + h, w₁ + k₁h) = 0.02 + 0.06(w₁ + 0.02h)
So, at t = 0.4s and w = 0 (initial conditions), we have:
k₂ = 0.02 + 0.06(0.02 * 0.4) = 0.02 + 0.00048 = 0.02048
So, W₂ = w₁ + (k₁ + k₂)(h/2)
= 0 + (0.02 + 0.02048)(0.4/2)
= 0.04048(0.2)
= 0.008096
Therefore, using Runge-Kutta 2nd order Heun's method, the speed (w) at t = 0.8s is approximately 0.0081.
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The complete question is:
The speed of a motor supplied with a voltage input of 30V, assuming the system is without damping, can be expressed as 30 = (0.02)+(0.06)w dt If the initial speed is zero and a step size of h = 0.4 s, determine the speed w at t = 0.8 s by using the Runge-Kutta 2nd order Heun's method. Heun's method: Wi+1=W₁ = w₁ + (-/-^₁ + = -K ₂ ) h where, k₁ = f(t₁, W₁) and k₂ = f(t₁ + h, w₁ + k₁h), the speed (w) at t = 0.8s is approximately 0.0081.
What rate do things fall to Earth?
Answer:
9.8 meters per square second
Explanation:
Free Falling Object. the value of g is 9.8 meters per square second on the surface of the earth. The gravitational acceleration g decreases with the square of the distance from the center of the earth. But for many practical problems, we can assume this factor to be a constant.
true or false: many nonspontaneous biochemical reactions couple with other reactions which supply enough free energy to drive them all.
Many non-spontaneous biochemical reactions couple with other reactions, which supply enough free energy to drive them all. This statement is True. A non-spontaneous reaction is a reaction that requires energy to proceed, also known as an endergonic reaction.
It has a positive ∆G, which means that it absorbs free energy rather than releasing it. On the other hand, a spontaneous reaction is a reaction that proceeds on its own, releasing free energy. It has a negative ∆G, which means that it releases free energy and requires no additional energy input to proceed. A coupled reaction is a chemical reaction in which the free energy released by one reaction drives another reaction that requires free energy. The two reactions must be coupled together in a way that enables them to share free energy, resulting in the spontaneous progression of the entire system.
As a result, many non-spontaneous biochemical reactions couple with other reactions that supply enough free energy to drive them all. The most common example of coupled reactions is the coupling of ATP hydrolysis with non-spontaneous reactions. This coupling can provide the energy required for cellular processes like muscle contraction, nerve impulse transmission, and protein synthesis. Furthermore, the coupled reactions serve as a means of energy conservation in living organisms.
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scientific notation
1. 0,000034
2. 0,0054
3. 346574
4. 0,00125
5. 348954
Answer:
1. 3.4 x10^-5
2. 5.4 x10^-3
3. 346574
4. 12.5x10^-4
5. 348954
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Determine the velocity of a cyclist that travels 2000 meters in 60 seconds.
I
Answer:
v = 2000m/60s; v = 33.33 m/s (plus, in velocity direction is needed in answer, if given)
Explanation:
velocity = distance/time
Deep-sea minerals are considered to be nonrenewable. Which time frame BEST identifies the time it would take for deep-sea mineral deposits to be replaced if they are significantly reduced by mining activities?
-0-10 years
-20-50 years
-75-100 years
-100+ years
Please hurry it’s a test
The correct answer is "100+ years" because the replacement of these minerals would take a very long time, likely longer than 100 years, even if new deposits are discovered.
When are they replaced?It is currently unknown how long it would take for deep-sea mineral deposits to be replaced if they are significantly reduced by mining activities. Deep-sea minerals are considered non-renewable, which means they form over geological time scales and cannot be replaced within a human lifetime or even many generations.
Deep-sea minerals are considered non-renewable, which means that they cannot be replenished naturally at a rate that meets the current rate of consumption.
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FAST WILL MARK BRAINLIEST EDGE 2021
Which factors affect the strength of a magnetic field around a current-carrying wire?
Check ALL that apply.
The type of metal of the wire
The amount of the current
The direction of the current
The temperature of the wire
The distance from the wire
Answer:
The type of metal of the wire
The distance from the wire
The amount of the current
Explanation:
why do some people suffer for nose bleed at higher altitudes?
Answer:because of small amount of oxygen
Explanation:
If you get higher by the atmosphere the air will start to decrease