Karen is running forward at a speed of 9 m/s. She tosses her sweaty headband backward at a speed of 20 m/s. The speed of the headband, to the nearest whole number relative to a stationary observer watching Karen, is _____ m/s

Answers

Answer 1
Let Karen's forward speed be considered as positive.
Therefore, before the headband is tossed backward, the speed of the headband is
V = 9 m/s

The headband is tossed backward relative to Karen at a speed of 20 m/s. Therefore the speed of the headband relative to Karen is
U = -20 m/s

The absolute speed of the headband, relative to a stationary observer is
V - U
= 9 + (-20)
= - 11 m/s

Answer:
The stationary observes the headband traveling (in the opposite direction to Karen) at a speed of 11 m/s backward.

Answer 2

Answer:

-11 m/s

Explanation:

a lot simpler than that above me


Related Questions

Lines with irregular meter and length are called _____.

Answers

think its free verse 

Lines with irregular meter and length are called Free Verse.

Free Verse, a literary device in literature refers to the poetry which is free from defects of regular rhythm or meter and length. There is no rhythm of the words, and no rhyme scheme in such kind of literary pieces. These kind of poems simply do not follow the rules of poetry.

What is the most relevant characteristic of motion

Answers

Motion is term which describes the change of the position of a body through time. 
Several things characterize motion: displacement, velocity, acceleration, speed, time,..
However the most relevant characteristic of motion is velocity- the rate of change of the position of an object in a certain time period. 


If 3.5 paper clips = 1.0 pencils and your paper is 1.5 pencils long, how many paper clips long is your paper?

Answers

[tex]\bf \begin{array}{ccll} paperclips&pencils\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 3.5&1.0\\ p&1.5 \end{array}\implies \cfrac{3.5}{p}=\cfrac{1.0}{1.5}\implies \cfrac{3.5\cdot 1.5}{1}=p[/tex]

If 3.5 paper clips = 1.0 pencils and your paper is 1.5 pencils long, then your paper would be 5.25 paper clips long.

What is the scale factor?

It is defined as the multiplication factor used for the design of an object with respect to some other object. the scale is generally used to design prototype designs of large objects. It is also used in interior design planning rooms.

It is multiplied by the design dimension to get the actual size of the object or product.

As given in the problem If 3.5 paper clips = 1.0 pencils and your paper is 1.5 pencils long, this means the scale factor of the pencil as a paper clip is 3.5

1 pencil = 3.5 paper clips

1.5 pencils = 1.5 × 3.5 paper clips

                 = 5.25 paper clips

Thus, If 3.5 paper clips = 1.0 pencils and your paper is 1.5 pencils long, then your paper would be 5.25 paper clips long.

learn more about scale factors from here

brainly.com/question/507867

#SPJ2

What effect does heating a solid to a high temperature have on its crystal lattice?

Answers

You should know from basic science that the difference in the three phases of matter is the arrangement of their molecules. Solids have compact molecules. Because of this, it is relatively more organized such that it is made up simple, repeating blocks of unit cells. This is called the crystal lattice. When the solid is heated, the kinetic energy of the system increases, thereby increasing frequency of collisions. But since the solid's atoms are compact, they merely vibrate. When the energy gets too high so that phase transformation can be achieved, the space inside the crystal lattice expands and the atoms move farther away from each other. Then, they could turn into a liquid of gaseous phase.

The lattice breaks apart and the ions flow freely. Gradpoint answer

If you hit another object with your vehicle, your _____ will be slowed or stopped by the force of impact caused by that object upon impact.

Answers

The answer is the vehicle. At the precise moment of the impact in a collision, there is the release of energy when a vehicle strikes another vehicle or another object. Earlier to an impact, a vehicle and everything inside the vehicle is traveling at whatever speed the vehicle had been going. As the collision continues, the vehicle slowly loses energy. However, the vehicle occupants and any others items in the vehicle continue to move forward at the same speed as the vehicle had been traveling prior to impact.

In egypt, the physiologic density is ______ greater than the arithmetic density [estimate value], because _______ [reason for difference].

Answers

In Egypt, the physiologic density is 2580 persons per square kilometer greater than the arithmetic density which is 75, because most of the country's land is not suitable for agriculture.
The land which is suitable for agriculture is called arable land. when physiological density is larger than arithmetic density it means country less arable land.

Wich group contains elements that are mostly likely to have similar properties

Answers

The answer yo this question is:

B-"Nitrogen, Arsenic, and Antimony"

Because its the only one out of all of the rest of the list that it contain properties that have similar element 


Your Welcome :)
Hi, 
nitrogen, arsenic, and antimony are most likely to have similar properties

An astronaut is taking a space walk near the shuttle when her safety tether breaks. what should the astronaut do to get back to the shuttle

Answers

The best way in handling in this situation is that in order for the astronaut to be able to get back to the shuttle is that he or she should take an object from his or her tool belt and to be thrown out away from the shuttle. This will allow her to weight lightly and safely return to the shuttle and would be easier for his or her to do so.
Final answer:

An untethered astronaut can return to the shuttle by using conservation of momentum or a safety jetpack known as Simplified Aid for EVA Rescue (SAFER). The first method involves throwing an object in the opposite direction, and the other involves using SAFER to propel back.

Explanation:

If an astronaut finds themselves adrift in space without a tether, their best bet would be to try and use conservation of momentum to return to the shuttle. They can do this by throwing an object in the opposite direction they wish to travel -- such as a tool or even their own glove. This action would propel them back towards the shuttle due to Isaac Newton's Third Law of Motion: For every action, there is an equal and opposite reaction.

Additionally, astronauts carry a safety jetpack called a Simplified Aid for EVA Rescue (SAFER) during spacewalks. They could use this to propel themselves back towards the shuttle.

Learn more about Space Physics here:

https://brainly.com/question/30899907

#SPJ12

Consider the transition from the energy levels n = 3 to n = 6. what is the wavelength associated with this transition, in nm?

Answers

In quantum chemistry, when the energy of electron changes by moving from orbital to orbital, it emits or absorbs energy in the form of light. When this happens, you can measure its wavelength. Suppose an atom is heated. This excites the electron so it moves up higher to the next orbital. As a result, it would emit light. When its energy lowers and moves one orbital lower, it would absorb light. The equation to determine the wavelength is called the Rydberg formula.

1/wavelength = R(1/n1^2 - 1/n2^2), where
R is an empirical constant called Rydberg's constant equal to 1.9074 × 10^7 m^-1
n1 and n2 are orbitals of the atoms such that n2 is always greater than n1.

Substituting the values:

1/wavelength = 1.9074 × 10^7 (1/3^2 - 1/6^2)
wavelength = 1.09 × 10^-6 m or 1.09 micrometers

Which of the following is a clue of a chemical change?
A. iron changes color when heated
B. gas bubbles form in boiling water
C. balls of wax form when melted wax is poured into ice water
D. a gas forms when vinegar and baking soda are mixed

Answers

The answer is D , when u mix the two ingredients it forms another by chemical reaction
The aswere is D.
Because its involve two material and causes reaction to make another form

Which one of these foods must be cooked to at least 165°f?
a. ground beef
b. pork
c. vegetables
d. chicken?

Answers

Among the foods mentioned - ground beef, pork, vegetables, and chicken - chicken is the one that must be cooked to at least 165°F to safely consume and ensure all harmful bacteria have been killed.

Out of the foods listed - ground beef, pork, vegetables, and chicken - the one that must be cooked to at least 165°F (73.9°C) is chicken.

Poultry, including chicken, should be cooked to a minimum internal temperature of 165°F as recorded on a food thermometer, to kill off any harmful bacteria that may be present. The safe minimum cooking temperature for ground meat, such as ground beef and pork, is lower at 160°F. Vegetables can be eaten raw or cooked to any preferred temperature.

Learn more about Food Safety here:

https://brainly.com/question/33878419

#SPJ6

Liquid flows through a 4.0 cm diameter pipe at 1.0 m/s. there is a 2.0 cm diameter restriction on the line. what is the velocity in this restriction?

Answers

To determine the velocity in the restriction, we need to remember the law of conservation of mass where mass in should be equal to the mass out since mass cannot be created or destroyed. For this system, mass flow rate in is equal to mass flow rate out. We do as follows:

Mass flow rate in = Mass flow rate out
density (volumetric flow rate in) = density (volumetric flow rate out)

Since the liquid in and out are the same, then density would be cancelled.
(volumetric flow rate in) = (volumetric flow rate out)
Area in x velocity in = Area out x velocity out
velocity out = area in x velocity in / area out
velocity out = π (4/2)^2 (1.0) / π (2/2)^2
velocity out = 4 m/s
Final answer:

The question pertains to the principle of continuity in fluid dynamics. When fluid flows from a wider to a narrower part of a pipe, its velocity increases to ensure that the mass flow rate remains constant. The velocity at the restriction can be found by plugging the appropriate area and velocity values from the wider part of the pipe into the continuity equation.

Explanation:

The subject in question relates to the physics principle of fluid dynamics. Specifically, we're discussing the continuity equation, which states that the mass flow rate must be constant throughout the pipe, irrespective of changes in the pipe's diameter. This is because the fluid is incompressible, meaning the same amount of fluid must flow past any point in the tube in a given time to ensure continuity of flow. Consequently, when the cross-sectional area of the pipe decreases, the velocity increases.

The formula that represents the continuity equation is A₁V₁= A₂V₂, where A represents the cross-sectional area of the pipe and V represents the velocity of the fluid. To find the velocity at the restriction (V₂), we must plug in the values for A₁, V₁, and A₂. Here, A₁ is the cross-sectional area of the larger part of the pipe, V₁ is the velocity in the larger pipe, and A₂ is the cross-sectional area of the restricted part.

To calculate A₁ and A₂, we use the formula for the area of a circle, which is A=πr². For A₁, r (radius) is half of the larger diameter, that is, 2 cm and for A₂, r is 1 cm (half of the restricted diameter). Substituting these values into the continuity equation will yield the desired velocity at the restriction (V₂).

Learn more about Fluid dynamics here:

https://brainly.com/question/30578986

#SPJ11

Which statement best explains why electricity should be conserved?

A. Fossil fuels generate electricity and are limited in supply.

B. Fossil fuels generate electricity and are exspensive.

C. Power plants use a lot of resources and never produce a lot of electricity

D. Power plants can use only one type of resource to produce electricity.

Answers

A seems to be the best answer

As much as 90% of the matter in the universe may be unseen “dark matter.” where is this dark matter?

Answers

As much as 90% of the matter in the universe my be unseen i.e. dark matter. There is a variety of explanations offered by many astronomers and physicists for this dark matter. It could merely be ordinary material such as ultra-faint stars, cold gas, large or small black holes or dust scattered around the universe, all of which emit or reflect too little radiation for our instruments to detect. It could also consist of exotic, unfamiliar particles that we have not figured out how to observe.

Final answer:

Dark matter is an unseen substance that makes up about 90% of the universe's mass, detectable through its gravitational effects on visible matter. It exists in a halo around galaxies and is essential for understanding the universe's composition and expansion fate.

Explanation:

The unseen matter that may constitute as much as 90% of the universe is known as dark matter. This dark matter is not directly observable because it does not emit or reflect any electromagnetic radiation. However, its existence is inferred from gravitational effects on visible matter, radiation, and the large-scale structure of the universe.

For example, galaxies contain far more mass than can be accounted for by the visible objects we can observe, and this extra mass is attributed to dark matter. The rapid rotation of stars on the outskirts of galaxies is one such gravitational effect indicating the presence of dark matter in a halo around the galaxies.

Discovering the true nature of dark matter is crucial as it may provide insights into particle physics and cosmology. There are theories that dark matter could be composed of neutrinos with a small mass or entirely new types of particles that have never been detected.

The understanding and evidence of dark matter continue to evolve, highlighting its importance in the universe's critical density and its possible role in the ultimate fate of the cosmic expansion.

A laser used to dazzle the audience at a rock concert emits blue light with a wavelength of 463 nm . calculate the frequency of the light.

Answers

The wavelength of light is given as 463 nm or can also be written as 463 x 10^-9 m. [wavelength = ʎ]

We know that the speed of light is 299 792 458 m / s or approximately 3 x 10^8 m / s. [speed of light = c]

 

Given the two values, we can calculate for the frequence (f) using the formula:

f = c / ʎ

 

Substituting the given values:

f = (3 x 10^8 m / s) / 463 x 10^-9 m

f = 6.48 x 10^14 / s = 6.48 x 10^14 s^-1

f = 6.48 x 10^14 Hz

Final answer:

The frequency of blue light with a wavelength of 463 nm is calculated using the speed of light and the formula for frequency, resulting in a frequency of 6.48 × 10¹⁴Hz.

Explanation:

To calculate the frequency of blue light emitted by a laser at a rock concert with a wavelength of 463 nm, we use the formula c = λf, where c is the speed of light (3.00 × 108 m/s), λ is the wavelength in meters, and f is the frequency in Hertz (Hz).

First, convert the wavelength from nanometers to meters: 463 nm = 463 × 10-9 meters.

Next, plug the values into the formula: f = c / λ = (3.00 × 10⁸ m/s) / (463 × [tex]10^-^9[/tex] m) = 6.48 × 10¹⁴ Hz.

Therefore, the frequency of the blue light is 6.48 × 10¹⁴Hz.

Coral bleaching that occurs because of the introduction of foreign substances is _______.

Answers

Um it would've helped if you had a list of choices lol, but the answer is Xenobiotics. Hope that helps you 

Floods, droughts, fires, and earthquakes are examples of _____.

Answers

floods, droughts, fires, and earthquakes are examples of ****natural disasters***
Answer;

Natural disasters

Explanation;Floods, droughts, fires, and earthquakes are examples of natural disasters.Natural disasters are events that occur as a result of natural processes of the earth and cause adverse effects. They include, floods, volcanic eruptions, tsunamis, tornadoes, and hurricanes among others.These events are extreme, sudden events caused by environmental factors that injure people and damage property. For example, floods and earthquakes may strike anywhere on earth , often without warning.

The length of a sheet of U.S. standard (letter-size) paper is closest to

Answers

279 millimeters is the answer

Answer:

I think is 8.5" x 11"

Explanation:

What is the weight, in pounds, of a 255-kg object on jupiter? express the weight numerically in pounds?

Answers

On a scale where Earth`s gravity is 1, Jupiter`s gravity is 2.346.
Weight ( Jupiter ) = 255 kg * 2.364 = 602.82 kg
We know that 1 kg = 2.2 lb.
602.82 kg * 2.2 = 1,326.2 lb.
Answer:
The weight of an 225 kg object on Jupiter is 1,326.2 pounds.
Final answer:

The weight of a 255-kg object on Jupiter is approximately 1421.6 pounds, after converting kilograms to pounds and adjusting for Jupiter's greater gravitational force.

Explanation:

To calculate the weight of a 255-kg object on Jupiter, we need to convert the mass in kilograms to pounds and then consider Jupiter's stronger gravitational pull. The weight calculation on Earth uses the conversion where 1 kg is equivalent to 2.205 pounds. However, since Jupiter's gravity is approximately 2.53 times that of Earth, we must multiply the Earth weight by this factor. Using the provided conversion factor, 255 kg on Earth is equivalent to 255 kg × 2.205 lb/kg which is approximately 561.975 lb. To find the weight on Jupiter, multiply this result by Jupiter's gravity factor: 561.975 lb × 2.53 = 1421.59725 lb. Considering significant figures based on the conversion factor of pounds and tenths place rounding, the weight would be reported as 1421.6 lb.

What best describes the overall impact of wilhelm roentgen's discovery of x-rays?

Answers

Doctors still use his discovery to make images of the bodys insides.
It enabled diagnostic radiology, looking inside a person and making a diagnosis possible through radiation instead of by opening someone up.

If you lose __________, braking may cause the vehicle to steer left or right unpredictably.

Answers

Steering control. If you lose it, you will have no control whether the vehicle steers left or right. 

Answer:

Steering control

Explanation:

If you lose Steering control , braking may cause the vehicle to steer left or right unpredictably.  Steering is collection components and linkages that control the direction of wheel of vehicle on road. Once the steering control is lost , the driver is not able to guide the vehicle and on braking, the vehicle can move in any direction unpredictably.

What is the term for the disturbed water left behind as a boat moves through the water?

Answers

The term for the disturbed water left behind as a boat moves through the water is wake.
When a boat glides through any type of water, it will sort of separate the water behind it for a few seconds, after which the water will return to normal once again. I've attached the image so that you can see clearly what I'm talking about. 

Answer:

Wake

Explanation:

As a boat moves through a water body (sea, river or ocean), the propeller causes the water to be separated as the boat moves. This separated water forms a new pattern based on the disturbance conferred by the boat. The disturbed water forms a visible huge flow of water sideways and backwards (based on the speed, size and weight of the boat). This disturbed water is referred to as the wake of the boat.    

If a proton is released at the equator and falls toward earth under the influence of gravity, the magnetic force on the proton will be toward the ____ assuming the magnetic field is directed toward the north at this location.

Answers

Final answer:

The magnetic force on a proton falling towards Earth at the equator, with the Earth's magnetic field directed north, will be towards the west due to the right-hand rule for magnetic forces on charged particles.

Explanation:

If a proton is released at the equator and falls towards Earth under the influence of gravity, and assuming the magnetic field is directed toward the north at this location, the magnetic force on the proton will be towards the west. This assertion is based on the right-hand rule for magnetic force, which states that if you point the fingers of your right hand in the direction of the proton's velocity (downward towards Earth), and bend your fingers in the direction of the magnetic field (north), your thumb will point in the direction of the magnetic force on a positively charged particle, which in this case is to the west.

This scenario exemplifies the interaction between charged particles and magnetic fields. The force on a charged particle moving through a magnetic field is always perpendicular to both the velocity of the particle and the magnetic field, which can result in circular or helical motion depending on the context.

if a 25kg block is being suspended 3 meters in the air, what is the potenti energy

Answers

Potential energy = gravitational potential energy
G.P.E = mgh
= 25 × 9.81 × 3
= 735.75 J
= 736 J

Hope it helped!

A force scale is attached to a stack of books lying on a flat table. 1.What happens to the size of the static frictional force as you begin to pull on the force scale? 2.What happens to the stack of the books if the applied force exceeds the maximum static frictional force? 3.What is the minimum size for the static frictional force, and under what conditions will the minimum static frictional force be observed? 4.What type of friction acts when the books are at rest but a force is exerted?

Answers

1. When you pull on the force scale, an opposite and equal reaction is also induced. This is the static frictional force. So when you begin to pull, the static frictional force gradually increases.

2. If it exceeds the maximum static frictional force, then the stack of backs begins to move. Then the static frictional force is converted to kinetic frictional force.

3. The minimum static frictional force is the least amount of force when you pull the force scale. Technically, you do not need to pull on it to achieve the minimum.

4. The type of friction is called the static frictional force. The term used is static because the object is at rest even though forces are exerted on it.
Final answer:

Static frictional force matches the applied force up to its maximum, after which the books slide, switching to kinetic friction. Minimum static friction is zero and occurs with no applied force. When resting books are subjected to a force below the static threshold, static friction acts.

Explanation:

Frictional Forces and a Stack of Books

When you begin to pull on a force scale attached to a stack of books lying on a table, the size of the static frictional force initially increases to match the applied force, up to its maximum value. If the applied force exceeds this maximum static frictional force, the books will begin to slide across the table, transitioning to a state where kinetic friction is acting on them. The minimum size for the static frictional force is observed when there is no applied force, and in such cases, it is effectively zero. While the books are at rest and a force is exerted that is below the static friction threshold, the type of friction acting is still static friction.

A ufo was detected on the radar flying 7400 miles in 3 min, what is the estimated speed per hour?

Answers

S=7400mi
t=3 min= 0.05h
v=7400mi/0.05h
v=148000mph

How much force is needed to accelerate your body at a rate of 2 m/s2 if you weigh 45 kg?

Answers

The formula for Force is...    F = ma or   Force = mass * acceleration

Now all we need to do is substitute in the given values to find the force...

F = ma
F = 45(2)
F = 90 N     <---- Remember the unit for force is the Newton or N for short

I hope this helps!

Vote me for Brainliest!

The human body is an organism made up of cells, tissues, organs, and organ system. Here are examples of three types of muscle tissue that are made of very different cells. How can scientists determine what type of cells make up each of these three tissues? A) By using a magnifying glass to observe each tissue. B) By collecting the tissues of people who have died and making observations. C) By dissecting the tissues and then making observations using a dissecting scope. Eliminate D) By placing samples of each tissue on a slide and viewing the slides using a microscope.

Answers

I would think that would be C.

Which type of noise has sound at every frequency within the range of human hearing?

Answers

White noise has sound at every frequency within the range of human hearing

Answer:

Explanation:

Noise which falls under human hearing range means from 20 Hz to 20,000 hz has sound at every frequency. The audible range from human is 20-20,000 hz so every noise within this range is audible to humans. Some animals such as whale, dolphin, bat communicate( to get their prey) beyond this range.

Which rf characteristic best determines the range of a 2.4 ghz ism signal?

Answers

The radio frequency characteristic that best determines the range of a 2.4 GHz ism signal is the wavelength.

This frequency can be used in WiFi and can reach up to 46 meters when indoors and about 92 meters when outdoors.

Other Questions
Which similarities do the father and son in The Metamorphosis share with Kafka and his father? A.Both fathers are violent and negative, while the sons are weaker and powerless. B.Both sons are rude, and their fathers are powerless to control them. C.Both sons have jobs they dislike, but their fathers tell them to keep working. D.Both fathers think highly of their sons, but the sons don't like their fathers. Determine whether the expression is a polynomial. If it is a polynomial, state the degree of the polynomial. x^3-9 a. yes, 3 b. yes, 1 c. yes, 2 d. no, it is not a polynomial Twice a certain number is tripled. The resulting number is _____. Question help mantua motors is evaluating a capital investment opportunity. this project would require an initial investment of $38,000 to purchase equipment. the equipment will have a residual value at the end of its life of $3,000. the useful life of the equipment is 5 years. the new project is expected to generate additional net cash inflows of $12,000 per year for each of the five years. mantua motors' required rate of return is 14%. the net present value of this project is closest to What is the goal for the first paragraph of the declaration of independence? How were literature and authors connected to the transcendentalist movement? Protections for the citizenry from unlawful or reprehensive acts by the government are contained primarily in: A total of 444 tickets were sold for the school play. They were either adult tickets or student tickets. The number of student tickets sold was two times the number of adult tickets sold. How many adult tickets were sold? Geometry Help Please Carlos, age 50, says that he can no longer hear the high pitched train whistle in the distance from his home, but reports being able to hear low pitch sounds perfectly fine. after receiving a hearing test, the audiologist will most likely diagnose carlos with HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPLEASEEEEEEEEEEEEEEEEEEEEEEEEEEECompare and contrast Mark Twain's Life on the Mississippi with Frederick Douglass's Narrative of the life of Frederick Douglass , An American Slave 7.What is the universal sign for choking?holding your throatcovering your mouthholding your headputting both arms up in the air What need did Mary MacKillop see? What is h(x) = 3x2 6x + 5 written in vertex form?h(x) = 3(x + 1)2 + 2h(x) = 3(x + 1)2 + 8h(x) = 3(x 3)2 4h(x) = 3(x 3)2 + 32 The process by which hydrogen and oxygen combine to form water can be classified as a what Two students in your class, Tucker and Karly, are disputing a function. Tucker says that for the function, between x = 3 and x = 3, the average rate of change is 0. Karly says that for the function, between x = 3 and x = 3, the graph goes up through a turning point, and then back down. Explain how Tucker and Karly can both be correct, using complete sentences. Which statement is true about the polynomial after it has been fully simplified? (See picture) What is the answer to solve negative eight positive negative 2 for integers? Cube-shaped bones that contain mostly spongy bone are called _____ bones. When liquid phosphorus trichloride is added to water, it reacts to form aqueous phosphorous acid, h3po3(aq), and aqueous hydrochloric acid? Steam Workshop Downloader