Answer:
Runner A will be 0.05 km from the flagpole, and runner B will be 0.07 km from the flagpole
Explanation:
We can find when their paths will cross as follows:
\( X_{f} = X_{0} + v_{0}t + \frac{1}{2}at^{2} \)
Where:
\(X_{f}\) is the final position
\(X_{0}\) is the initial position
v₀ is the initial speed
t is the time
a is the acceleration = 0 (since they are running with a constant velocity)
When their paths cross we have:
\(X_{fA}+X_{fB}=5.8+4.9=10.7 km\)
\(V_{A}t+V_{B}t=10.7\)
\(8.6t+7.1t=10.7\)
\(t = 0.68 h\)
Now we can find the final distance of each runner.
\(X_{fA}=V_{A}*0.68\)
\(X_{fA}=8.6*0.68 km\)
\(X_{fA}=5.85 km\)
\(X_{fB}=V_{B}*0.68\)
\(X_{fB}=7.1*0.68\)
\(X_{fB}=4.83 km\)
Therefore, runner A will be 0.05 km from the flagpole, and runner B will be 0.07 km from the flagpole.
I hope it helps you!
1294joules of work landed 100meters away how much force did the player hit the ball
A force of 12.94 N is used to move a ball 100 M. Given amount of work done is 1294 joules.
What is work?Work in physics is the energy that is transferred to or from an item when a force is applied along a displacement. In its simplest form, it equals the product of the force's magnitude and the distance traveled for a constant force directed in the direction of motion.
Given in the question a work of 1294 joules is used to move a ball 100 M then,
Work = force x distance. In units, Joules = Newtons x meters.
So, 1294 = F Newtons x 100 meters
Force , F = 12.94 joules.
A force of 12.94 N is used to move a ball 100 M. Given amount of work done is 1294 joules.
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What does Boyle's law state about pressure and volume at a constant temperature and a constant pressure
Answer: Boyle's law states that when the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.
Explanation:
Answer: Provided temperature remains constant, the volume and pressure of a gas are inversely related.
Explanation: Robert Boyle discovered that as long as the temperature of a gas remains constant, the relationship between the volume and the pressure of the gas is inverse. Basically, as the volume of a gas increases, its pressure decreases. As the pressure of the gas increases, its volume decreases.
Student A says, "Things like humans don't emit light." Student B says, "Humans emit light, but we just can't see it." Which student is correct?
Answer:
Yes
Explanation:
the human body is able to emit light but I. small portions often difficult for the human eye to see.
Compare the spectra of blackbodies with different temperatures. Which of the following is true? a. The peak of emission in the spectrum of the hotter object is at a longer wavelength. b. The cooler object shows greater emission at infrared wavelengths than the hotter object does. c. The peak of the emission in the spectrum of the cooler object is at a longer wavelength. d. The total energy emitted per area by the cooler object is greater than that emitted by the hotter one. e. The emission from the hotter object is smaller at ultraviolet wavelengths than that of the cooler object.
According to Wien's Law, the peak wavelength of a blackbody's spectrum is inversely proportional to its temperature. Therefore, a cooler object will have a peak emission at a longer wavelength compared to a hotter object.
As the temperature of a blackbody increases, its spectrum shifts to shorter wavelengths and the peak of the emission moves to shorter wavelengths. Therefore, option a is false. Option b is also false because hotter objects emit more radiation in all wavelengths, including infrared. Option c is true because, as mentioned, the peak of the emission moves to shorter wavelengths as temperature increases. Option d is false because hotter objects emit more energy per unit area than cooler ones. Option e is false because hotter objects emit more radiation in all wavelengths, including ultraviolet. Therefore, the correct answer is c.
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Martha, a first-grade teacher, is worried that if doesn't stay In at work to grade papers her principal will think she is lazy She is also worried that if she stays late at work her partner will be angry. This of conflict is known as
Answer:
Character vs self
Explanation:
The reason is because Martha is thinking to much about the negative things and it is making her feel like she is fighting her own body for control.
if the rank of a is r, then occurs as an eigenvalue of a with multiplicity r.
If λ occurs as an eigenvalue of A with multiplicity r, then there are r linearly independent eigenvectors associated with λ, and the geometric multiplicity of λ is equal to r.
Let A be an n × n matrix. An eigenvalue of A is a scalar λ such that there is a nonzero vector x satisfying the equation Ax = λx. This equation can be rewritten as the linear system (A − λI)x = 0, where I is the identity matrix. Nontrivial solutions to this equation exist if and only if the matrix A − λI is singular, which means that its determinant is zero. Thus, the eigenvalues of A are the roots of the polynomial equation det(A − λI) = 0, which is called the characteristic equation of A. The algebraic multiplicity of an eigenvalue is the number of times it appears as a root of the characteristic equation. The geometric multiplicity of an eigenvalue is the dimension of the eigenspace associated with that eigenvalue. The eigenspace of an eigenvalue λ is the set of all eigenvectors of A associated with λ, along with the zero vector.
The rank of A is the dimension of its column space, which is the span of its column vectors. The rank of A is equal to the dimension of the row space of A, which is the span of its row vectors. The rank of A is also equal to the number of nonzero singular values of A. If the rank of A is r, then the dimension of the nullspace of A is n − r. If A has r linearly independent eigenvectors associated with a particular eigenvalue λ, then the geometric multiplicity of λ is r. If the algebraic multiplicity of λ is greater than its geometric multiplicity, then there are not enough eigenvectors to form a basis of the eigenspace associated with λ, which means that A is not diagonalizable. If the algebraic multiplicity of λ is equal to its geometric multiplicity, then A is diagonalizable. If λ occurs as an eigenvalue of A with multiplicity r, then there are r linearly independent eigenvectors associated with λ, and the geometric multiplicity of λ is equal to r.
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If the distance an object travels and the time it takes to travel the distance are known, which of the following can be calculated?
Answer:
speed
Explanation:
The distance traveled and time, the average speed of an object can be calculated. The correct answer would be option (A).
What is the average speed?Average speed is defined as the total distance traveled by an object divided by the total time it took to travel that distance. This is a measure of the overall pace of an object's motion over a period of time.
Instantaneous speed is the limit of the average speed as the time interval approaches zero. In other words, it's the rate of change of an object's position with respect to time at a specific moment.
Average acceleration is defined as the change in velocity (speed in a certain direction) divided by the time interval over which that change occurred. This is a measure of the rate of change of an object's speed over a period of time.
Instantaneous acceleration is the limit of the average acceleration as the time interval approaches zero. In other words, it's the rate of change of an object's velocity at a specific moment.
In summary, with the given information of distance traveled and time, the average speed of an object can be calculated, but the instantaneous speed, average acceleration, and instantaneous acceleration cannot be calculated.
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The complete question would be as:
If the distance an object travels and the time it takes to travel the distance are known, which of the following can be calculated?
A. Average speed
B. Instantaneous speed
C. Average acceleration
D. Instantaneous acceleration
88. A student varied the length of a simple pendulum and measured its period, which is the time required to complete one cycle of motion. In this experiment, time represents the variable that is
(1) dependent and graphed on the
horizontal axis
(2) independent and graphed on the
horizontal axis
(3) dependent and graphed on the vertical axis
(4) independent and graphed on the
vertical axis
In this experiment, time represents the variable that is independent and graphed on the horizontal axis.
The period of the pendulum does not depend on the mass of the sphere, only on the length of the chord. Two pendulums with different masses but the same length have the same period. Two pendulums of different lengths have different periods with the pendulum with the longer string having a longer period.
For small deflections of less than 15 degrees, the pendulum experiences simple harmonic oscillations. This means that its restoring force is directly proportional to its deflection. A simple pendulum is called a simple pendulum. The longer the pendulum is, the longer it will take to travel the distance it swings from side to side. The period of a pendulum is the time it takes for the weight to swing and return to its original position so it means a longer period.
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Predict the acceleration of a roller coaster that goes from 0 to 190km/h in 4 seconds. Express your answer in km/s^2. Round to three decimal places.
Answer:
0.13 km/s²
Explanation:
Convert hours to seconds
1 hour = 60 seconds (60) = 3600 seconds
\(\frac{190}{3600}\) = 0.052778
\(\frac{0.052778}{4s}\) = 0.013195
0.13 km/s^2 (Round the three decimals)
The acceleration of a roller coaster that goes from 0 to 190 km/h in 4 seconds is 0.13 km/s².
What is linear acceleration?It is defined as the rate of change in linear velocity with respect to time. It is also known as linear acceleration.
It is given that:
Predict the acceleration of a roller coaster that goes from 0 to 190km/h in 4 seconds.
As we know from the unit conversion:
1 hour = 60 minutes
60 minutes = 3600 seconds
190km/h in km/s
= 190/3600
= 0.0527
The acceleration of a roller coaster = (v2 - v1)/t
The acceleration of a roller coaster = (0.0527 - 0)/4
The acceleration of a roller coaster = 0.13 km/s²
Thus, the acceleration of a roller coaster that goes from 0 to 190 km/h in 4 seconds is 0.13 km/s².
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BY what factor does the kinetic energy of a moving body change when its speed is reduced to half? please help i have an exam and i need an answer
Answer:
Kinetic Energy = 1/2 mass*velocity^2
K=1/2mv^2
Therefore if you reduce the speed of an object by 1/2, K reduced to 1/4 its value.
Why is temperature a good criterion for searching for Earth like exoplanets?
Answer:
Liquid water is essential for life to exist. Water can occur in a liquid state only within a specific temperature range, so knowing the temperature range on a planet will help astronomers predict whether life exists on that planet.
A
heat engine is measured to have 30% efficiency. Is the theoretical
efficiency going to be greater or less than that? Why?
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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please answer withhin 400 words
Question 52 (8 points) Using schematics, draw and fully describe with labels and descriptive text a horizontal cross section of a warm front and a cold front for a mid-latitude low pressure system at
The slope of a cold front is steeper than that of a warm front.
A warm front and a cold front are two different fronts associated with a mid-latitude low-pressure system. A cross-sectional view of these fronts can be helpful in better understanding their characteristics and structure. Let's take a look at the horizontal cross-section of these fronts:
Image showing the Horizontal Cross section of a warm front and a cold front for a mid-latitude low pressure system:
The 150 isobar is shown in bold.
The vertical structure of a warm front:
In a mid-latitude low-pressure system, a warm front represents the leading edge of a warm, moist air mass as it approaches a region of cold, dry air. In general, the warm air moves toward the cold air in the form of a low-level wedge. The warm front is associated with a gradual decrease in temperature and pressure as one moves from the warm side to the cold side of the front. The steepness of the frontal slope is gradual. The slope is gradual because the warm air rises over the cool air.
The vertical structure of a cold front:
A cold front represents the leading edge of a cold, dry air mass as it advances toward a region of warm, moist air. It is usually associated with a line of clouds, precipitation, and thunderstorms. The frontal slope is steeper than that of a warm front, with a temperature drop of several degrees Celsius per kilometer of ascent. The cold air moves in a downward motion to the ground and forces the warm air up. This motion creates clouds, precipitation, and sometimes thunderstorms. Therefore, the slope of a cold front is steeper than that of a warm front.
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according to Newton's first law of motion an object at rest will remain at rest and an object in motion will continue to move at a constant velocity because of net force are
A balanced
B unbalanced
C acting in Paris
D the same
Answer:
i think its b
Explanation:
its been awhile since I've worked on Newton's first law
how can sounds be changed and what is the cause of the change?
Sounds can be changed in a variety of ways depending on the source of the sound and the type of change you want to make. Here are a few examples:
PitchVolumeTimbreDurationWhat are the cause of the change in sound?The cause of the change depends on the type of change being made. For example, changing the pitch of a sound is caused by altering the frequency of the sound wave, while changing the volume is caused by altering the amplitude of the sound wave.
In general, changes to sound waves can be caused by physical manipulation of the sound source, such as adjusting the properties of a musical instrument, or by electronic processing of the sound signal using digital signal processing techniques.
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A ball on a string l=15.2cm is submerged in a superfluid with density pb. The ball is made of material with density rhob =4rhof. What is the period of small oscillations if the friction can be neglected?
The period of small oscillations of the ball on a string submerged in a superfluid with density pb can be determined by using the formula:T = 2π √(l/g)
Where T is the period of oscillation, l is the length of the string, and g is the acceleration due to gravity.
However, in this case, we need to take into account the density of the ball and the material it is made of. The ball's density is given as 4 times the density of the superfluid, i.e., rhob = 4rhof.
Since the superfluid has a density of pb, we can calculate the weight of the ball as W = rhob Vg = 4rhof Vg, where V is the volume of the ball.
We can also calculate the buoyant force acting on the ball as Fb = pb Vg.
The net force on the ball can be found by subtracting the buoyant force from the weight, i.e.,
Fnet = W - Fb = (4rhof - pb) Vg
Since the friction can be neglected, the ball will undergo small oscillations with a period given by the formula mentioned earlier.
Thus, the period of small oscillations can be calculated as:
T = 2π √(l/(4rhof - pb)g)
In summary, the period of small oscillations of the ball on a string submerged in a superfluid with density pb is given by the above formula, which takes into account the density of the ball and the material it is made of, as well as the buoyant force and net force acting on it.
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Complete the following sentences.
mento
When you drop a ball, it falls to the ground,
This happens because the
pulls the ball
towards it with a force called
I
Forces are measured in units called
(Total 3 marks)
A cylinder fitted with a piston has a volume of 0.2 m? and contains 1 kg of steam at 300 kPa.
Heat is transferred to the steam until the temperature is 400 C, while the pressure remains
constant. Determine the heat transfer and the work for this process.
The heat transfer and work for this process are 554.1 kJ and 47,000 J, respectively. The gas law equation (PV = nRT) is used to calculate the final volume.
Step 1: Identify known values and convert them into SI units. Volume = 0.2 m³Pressure = 300 kPa, Temperature = 400 °C, Mass = 1 kg
Step 2: Find the final volume of the system since the pressure is constant. The gas law equation (PV = nRT) is used to calculate the final volume. V₁ = nRT / PInitial volume, V₂ = 0.2 m³, pressure P = 300 kPa = 300,000 Pa, R = 0.287 kJ/kg K (gas constant), and n = m/M, where m = 1 kg and M = 18.01528 kg/kmol (molar mass of steam)
Hence, V₁ = (1 kg × 0.287 kJ/kg K × 673 K) / (300,000 Pa × 18.01528 kg/kmol)
= 0.0435 m³
Step 3: Find the work done during the process.
The work done, W = PΔV, where ΔV is the change in volume.ΔV = V₁ - V₂
= 0.0435 m³ - 0.2 m³
= -0.1565 m³
Hence, W = -300,000 Pa × -0.1565 m³
= 47,000 J (work done by the gas)
Step 4: Determine the heat transfer during the process.
Q = mCΔT, where C is the specific heat capacity of steam at constant pressure. C = 1.847 kJ/kg KΔT
= T₂ - T₁
= 400 °C - 100 °C
= 300 K
Hence, Q = 1 kg × 1.847 kJ/kg K × 300 K
= 554.1 kJ (heat absorbed by the gas)
Therefore, the heat transfer and work for this process are 554.1 kJ and 47,000 J, respectively.
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If a door is 9800 cm wide, how many kilometers wide is it?
Answer:0.098
Explanation:
PLEASE HELP WILL MARK AND 5 stars
What is the average repetition or time for High Knees
PLEASE HELP!!! WILL MARK BRAINLIEST!! Name and define the four fundamental forces.
Answer:
Gravity - is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another.
Strong Interaction - is the mechanism responsible for the strong nuclear force
Weak Interaction - is the mechanism of interaction between subatomic particles that is responsible for the radioactive decay of atoms
Electromagnetism - is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles.
Hope this helps!
Max and his friend want to ride in the front car of a roller coaster. What happens to the car's kinetic energy as the roller coaster car is pulled to the top of the first big hill?
A.
Its kinetic energy is released into the air at the top of the hill.
B.
Its kinetic energy is added to the potential energy to give it twice as much speed.
C.
Its kinetic energy is converted to potential energy at the very top of the hill.
D.
Its kinetic energy is transferred to the wheels so it can roll quickly down the hill.
Answer:
KE =1/2mv^2
Explanation:
KE depends upon movement of the body
Why do electrons stay around the nucleus of an atom?
Answer:
the nucleus of the atom is positively charged and the electrons are negatively charged, they are attracted to each other...
Answer:
There are 2 different types of neutrons. Negative and positive. They are both fighting over the atom. The atom doesn't know who to pick! The happy one? Or the emo one? They are both staying close because they don't want to lose this fight. (Actual answer below)
Explanation:
When there are too many protons, some of the outer protons are loosely bound and more free to react with the electron. But most atoms do not have too many protons, so there is nothing for the electron to interact with. As a result, each electron in a stable atom remains in its spread-out wavefunction shape.
An electric wall clock has a second hand 15 cm long. What is the radial acceleration of the tip of this hand?
4.25* 10^-4 m/s^2
5.32* 10^-2 m/s^2
1.64* 10^-3 m/s^2
3.16* 10^-3 m/s^2
when you ride your scooter you have momentum When you ride twice as last you have Select one: a.almost twice the momontum- b.nonc ol the above c.twice the momentum d. four times the momentum
When you ride your scooter, you have momentum which is determined by your mass and velocity. Momentum is a vector quantity, meaning it has both magnitude and direction.
When you ride twice as fast, you have twice the velocity, which results in a change in momentum.The relationship between velocity and momentum is direct. Therefore, when you ride twice as fast, you have twice the momentum. This means that the correct answer is option c. You will have twice the momentum when you ride twice as fast on your scooter.It is important to note that momentum is conserved in a closed system, which means that the total momentum before and after the event remains the same.
Therefore, if you were to ride your scooter into a wall, your momentum would be transferred to the wall, causing you to stop abruptly. When you ride your scooter, you have momentum. Momentum is the product of an object's mass and velocity (p = mv). If you ride twice as fast, your velocity doubles. In this case, your momentum also doubles, since the mass remains the same. Therefore, the correct answer is c. twice the momentum.
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A plane makes a complete circle with a radius of
3622 m in 2.10 min. What is the speed of the plane?
Answer:
10
Explanation:
hen you sit in your desk chair, the reaction force to your weight is the normal force from the chair. True False Suppose that a book is sliding against a rough table. A constant force is needed to maintain its velocity. True False
When you sit in your desk chair, the reaction force to your weight is the normal force from the chair, which is a true statement. Suppose that a book is sliding against a rough table, then a constant force is needed to maintain its velocity, which is also a true statement.
The normal force is an example of the contact force, which is the force that arises when two objects are in physical contact with each other. It acts perpendicular to the surface of contact and opposes the force of gravity.The force of friction acts against the relative motion of the surfaces in contact, and the net force is the difference between the two opposing forces.
When a book is sliding on a rough table, a force is needed to balance the force of friction acting on it so that its velocity can be maintained at a constant level. The book's velocity decreases over time if the force applied is less than the force of friction on the book. If the force applied is greater than the force of friction on the book, its velocity increases over time. Therefore, a constant force is needed to maintain its velocity
.According to Newton's laws of motion, a body remains at rest or in uniform motion in a straight line unless acted upon by an external force. A constant force is required to maintain uniform motion in the absence of any external force acting on the body.
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if a snail moves 6.5in/min, how many miles per hour does the snail travel?
Answer:
Unit Conversion
6.5in/min× 1ft/12in× 1 mile/5280ft= 0.001231 m/min0.001231 m/min× 60 min/1hr= 0.0738 miles/hrList three uses of the rare earth metal neodymium.
Neodymium is a key component of the powerful magnets used in many everyday products. Neodymium oxide can be used as a glass colorant to create a range of hues. Neodymium compounds are used as catalysts in a variety of industrial processes
Neodymium is a versatile rare earth metal with various applications. Three uses of neodymium are:
1. Magnets: Neodymium is used to create strong permanent magnets, known as neodymium-iron-boron (NdFeB) magnets. These magnets are commonly found in electric motors, generators, headphones, and hard disk drives.
2. Glass: Neodymium is used as a colorant in glass to produce specific shades, particularly in sunglasses and camera lenses. It also helps reduce glare and enhance contrast in optical devices.
3. Catalysts: Neodymium acts as a catalyst in certain chemical reactions, particularly in the petroleum industry for refining crude oil and producing synthetic fuels.
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the reactance (in ohms) of an inductor is given by ω ∙ l , where ω is in radians per second. given the l = 33 mh inductorthat we will use in lab, what do we expect the reactance to be? use f = 6 khz
Answer:
we expect the reactance of the 33 mH inductor at a frequency of 6 kHz to be approximately 1.24 ohms.
Explanation:
To calculate the reactance (in ohms) of an inductor, we use the formula:
X_L = ω ∙ L
where X_L is the reactance of the inductor in ohms, ω is the angular frequency in radians per second, and L is the inductance in henries.
However, we are given the inductance in millihenries (mH), so we first need to convert it to henries:
L = 33 mH = 33 × 10^-3 H
We are also given the frequency f in kilohertz (kHz), so we can convert it to angular frequency ω using the formula:
ω = 2πf
ω = 2π × 6 kHz = 37.7 krad/s (approx.)
Now we can use the formula to calculate the reactance of the inductor:
X_L = ω ∙ L
X_L = 37.7 k rad/s × 33 × 10^-3 H
X_L = 1.24 Ω (approx.)
Therefore, we expect the reactance of the 33 mH inductor at a frequency of 6 kHz to be approximately 1.24 ohms.
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