Remi travels 160 meters in 4 seconds. What was Remi's initial speed if her final velocity was 6.9 m/s?

If at a concert, a wind blows directly from the orchestra toward you, the frequency of the sound you hear will be neither decreased nor increased. Option C is correct.

The frequency of the sound you hear at a concert will not be affected by the direction of the wind blowing from the orchestra toward you. The frequency of sound waves is determined by the source of the sound and the speed of sound in air, and is not affected by the wind blowing in a particular direction.

However, the intensity or volume of the sound may be affected by the wind, especially if it is a strong wind. In this case, the sound waves may be partially blocked or scattered by the wind, leading to a reduction in the volume of the sound that reaches you.

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Answer:

Explanation:

Is this a velocity time graph?

Answer:

Astronomers led by Eduardo Bañados of the Max Planck Institute for Astronomy have discovered a gas cloud that contains information about an early phase of the galaxy and star formation, merely 850 million years after the Big Bang.

Explanation:

Explanation:

the velocity of sound in air is 330m/s

and v=fh, where h is wavelength f is frequency,

h=v/f.......(1)

longer wavelength

h=330/20,h=16.5m

shorter wavelength

h=330/20000,h=1.65x10-²m

The lesser frequency was used for finding the longer wavelength since wavelength is inversely proportional to frequency,

thus an increase in frequency brings a decrease in wavelength.

and shorter wavelengths are more high and intense

hope this helps

Since you are 2.5 m away from the plane mirror, the distance you need to dial in for your camera's focus would also be 2.5 m.

This is because the light rays from your image in the mirror will be reflected as if they were coming from a virtual image behind the mirror at the same distance as the object (in this case, you) in front of the mirror. Therefore, the camera should be focused at a distance of 2.5 m to capture a clear image of yourself in the mirror.
To take a picture of yourself in a plane mirror placed 2.5 meters away, you would need to manually adjust the focus of the camera by dialing in the distance of 5 meters. This is because the total distance includes the distance from you to the mirror (2.5 meters) and the distance from the mirror to your reflection (another 2.5 meters).

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By estimating, we can see if the response is reasonable: 2.5 m/s is the product of 5 metres and 2 seconds.Therefore answer is 2.5m/s.

By dividing the amount of time it took the object to go a certain distance by the overall distance, one can calculate the object's initial velocity. V is the speed, d is the distance, and t is the time in the equation V = d/t.An object's terminal velocity is its top possible speed as it plunges through a liquid (air is the most common example). It happens when the object is subjected to a downward force of gravity (FG) equal to the total of the drag force (Fd) and buoyancy.

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To safely use your electric grill in the backyard, you need to select the right extension cord. Take into account the power requirements of the grill, the distance between the outlet and grill

To use your electric grill in the backyard without incidents, you will need an extension cord that meets the requirements of your grill. Since the resistance of a conducting wire increases with its length, it's important to consider the length and gauge (thickness) of the extension cord.

Here are the steps to determine the appropriate extension cord:

1. Check the grill's power requirements: Look for the wattage or amperage rating on the grill or in the user manual. It will indicate how much power the grill consumes.

2. Determine the length needed: Measure the distance from your electric outlet to the grill's intended location in the backyard. This will help you choose an extension cord of the appropriate length.

3. Choose the gauge: The gauge of the wire determines its thickness and ability to carry electrical current. For longer distances, a thicker gauge is required to minimize resistance and prevent overheating. Thicker gauges have lower numbers, such as 12 or 10, while thinner gauges have higher numbers, such as 14 or 16.

4. Calculate the amperage: Use Ohm's law (V = IR) to calculate the amperage of the extension cord. Divide the wattage of the grill by the voltage of your power supply (usually 120V in residential settings) to get the amperage. For example, if the grill is rated at 1200W, the amperage would be 10A (1200W ÷ 120V = 10A).

5. Check the ampacity rating: Look for the ampacity rating of the extension cord, which indicates the maximum safe current it can handle. It should be equal to or higher than the amperage calculated in the previous step. Choose an extension cord with a higher ampacity to allow for some safety margin.

6. Ensure proper connections: Make sure the extension cord has grounded three-prong plugs on both ends, matching the outlets you'll be using.

By following these steps, you can choose an extension cord that is appropriate for your electric grill, ensuring safe and efficient operation without incidents.

In conclusion, to safely use your electric grill in the backyard, you need to select the right extension cord. Take into account the power requirements of the grill, the distance between the outlet and grill, and the gauge of the extension cord. Calculate the amperage and choose an extension cord with an ampacity rating equal to or higher than the calculated amperage. By considering these factors, you can ensure that the extension cord can handle the electrical load without significant resistance, reducing the risk of incidents and ensuring proper functioning of your electric grill.

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The angular velocity of the ISS is 0.012 rad/s. the height above the Earth's surface at which the ISS orbits is 408 km. the tangential speed of the ISS is 7 km/s.

a) Calculate the angular velocity of the ISS.

The angular velocity of the ISS can be calculated using the following formula:

ω = v / r

where:

ω is the angular velocity in radians per second

v is the tangential velocity in meters per second

r is the radius of the orbit in meters

The tangential velocity of the ISS is the speed at which it travels along the circumference of its orbit. The radius of the ISS's orbit is the distance from the center of the Earth to the ISS.

In this case, the tangential velocity of the ISS is 7.66 kilometers per second. The radius of the ISS's orbit is 6371 kilometers. Therefore, the angular velocity of the ISS is:

ω = 7.66 km/s / 6371 km = 0.012 rad/s

b) Calculate the height above the Earth’s surface at which the ISS orbits.

The height above the Earth's surface at which the ISS orbits can be calculated using the following formula:

h = r * (1 - (1 - e^2)^(1/2))

where:

h is the height above the Earth's surface in meters

r is the radius of the Earth in meters

e is the eccentricity of the orbit

The eccentricity of the ISS's orbit is 0.016. Therefore, the height above the Earth's surface at which the ISS orbits is:

h = 6371 km * (1 - (1 - 0.016^2)^(1/2)) = 408 km

c) Calculate the tangential (linear) speed the ISS must travel to maintain this orbit.

The tangential speed of the ISS can be calculated using the following formula:

v = ω * r

where:

v is the tangential speed in meters per second

ω is the angular velocity in radians per second

r is the radius of the orbit in meters

The angular velocity of the ISS is 0.012 rad/s. The radius of the ISS's orbit is 6371 kilometers. Therefore, the tangential speed of the ISS is:

v = 0.012 rad/s * 6371 km = 7.66 km/s

rounded to the nearest whole number: 7 km/s

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Answer:

ecdbaf

Explanation:

The logical order of the steps of the scientific method is as follows:

a. analyze the data -- 5

b. test the hypothesis - 4

c. form a hypothesis - 3

d. gather information - 2

e. state the problem - 1

f. draw conclusions - 6

Each experiment and research uses the scientific method to test their hypothesis or solving the problem. The scientific method is a step-by-step process to acquire knowledge about a particular problem. There are the following steps in the scientific method

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Answer:

28.8kg

Explanation:

h1=8m

h2=2m

h2-h1=6m

k=48 N/m

g=10m/(s^2)

w=F

10m=6*48

m=28.8kg

The maximum possible speed of the electron emitted when a 3.0 eV photon strikes the surface of sodium is approximately 6.62 x 10⁵ m/s.

When a photon strikes the surface of a material, it transfers its energy to an electron, causing it to be emitted. The maximum kinetic energy of the emitted electron can be calculated using the equation:

K.E. = hν - Φ

where K.E. is the kinetic energy, h is the Planck's constant (6.626 x 10⁻³⁴ J·s), ν is the frequency of the photon, and Φ is the work function of the material.

In this case, the energy of the photon is given as 3.0 eV. To convert it to joules, we can use the conversion factor 1 eV = 1.6 x 10⁻¹⁹ J. Therefore, the energy of the photon is 3.0 eV x (1.6 x 10⁻¹⁹ J/eV) = 4.8 x 10⁻¹⁹ J.

Sodium has a work function of approximately 2.3 eV, which is equivalent to 3.68 x 10⁻¹⁹ J. Substituting the values into the equation:

K.E. = (4.8 x 10⁻¹⁹ J) - (3.68 x 10⁻¹⁹ J) = 1.12 x 10⁻¹⁹ J

To find the maximum speed of the electron, we can use the equation:

K.E. = (1/2)mv²

where m is the mass of the electron (9.11 x 10⁻³¹ kg) and v is the speed of the electron.

Rearranging the equation, we have:

v = √((2K.E.)/m) = √((2 x 1.12 x 10⁻¹⁹ J) / (9.11 x 10⁻³¹ kg)) ≈ 6.62 x 10⁵ m/s.

Therefore, the electron emitted from sodium when struck by a 3.0 eV photon can reach a maximum speed of around 6.62 x 10⁵ m/s.

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In the drag race between Alison and Kevin, Alison wins by 1 second.Let's denote the total distance of the race as "d" and the constant accelerations of Alison and Kevin as "a" and "b," respectively. Since both drivers start from a standing position, their initial velocities are zero.

According to the given information, Alison covers the last 1/4 of the distance in 3 seconds, while Kevin covers the last 1/3 of the distance in 4 seconds.

Let's calculate the time it takes for Alison to cover the last 1/4 of the distance:

Since the distance covered is 1/4 of the total distance, we can write:

1/4 * d = (1/2) * a * (3^2)

d = 9a/2

Similarly, for Kevin, the time it takes to cover the last 1/3 of the distance is:

1/3 * d = (1/2) * b * (4^2)

d = 8b/3

Since both expressions represent the same total distance, we can equate them:

9a/2 = 8b/3

Simplifying the equation, we find:

27a = 16b

From this equation, we can see that Alison's acceleration is greater than Kevin's. Therefore, Alison reaches the finish line before Kevin, winning the race.

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When a rifle fires at a distant target, the barrel should be pointing straight towards the target.

This is because the barrel is the part of the rifle that the bullet travels through to reach the target. If the barrel is not pointing directly at the target, the bullet may not hit it.

Therefore, it is important to aim the barrel accurately when shooting a rifle at a distant target.

A rifle is a long gun designed to be fired from the shoulder, with a barrel that has spiral grooves (rifling) cut into the inside of the barrel wall that forces the bullet to rotate as it moves out of the barrel.

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Answer:

Newton's third law of motion states that whenever a first object exerts a force on a second object, the first object experiences a force equal in magnitude but opposite in direction to the force that it exerts. ... Newton's third law is useful for figuring out which forces are external to a system.

Explanation:

is these what you're looking for?

Answer:

Why ?? What happened ??

The Doppler effect can be used to measure radial motion, which refers to the motion of objects along the line of sight. In the context of stars, the Doppler effect allows astronomers to determine the radial velocity of stars, which is their motion towards or away from the observer.

When a star moves towards an observer, the observed wavelengths of the light emitted by the star are compressed, resulting in a blue shift. On the other hand, when a star moves away from an observer, the observed wavelengths are stretched, leading to a red shift. By analyzing the shift in the wavelengths of the star's spectral lines, astronomers can determine the star's radial velocity.

The Doppler effect is a valuable tool for studying the motion of stars, including the motion of binary star systems, the rotation of stars, and even the motion of galaxies. It allows astronomers to investigate the dynamics and kinematics of celestial objects and gain insights into their behavior and interactions.

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Answer:

The ways to change the total energy are to either make the hill taller to increase it or make the hill lower to decrease the total energy.

Explanation:

The total mechanical energy of a system is the sum of the total kinetic energy and total potential energy.

Answer:

yes

Explanation:

Answer:

c. 20 amps.

just divide the watts by the volts

Answer:

that answer is

b. 1/4,000

Answer:

mechanical energy

Explanation:

Answer:

In this lab, we used a virtual spectrometer to analyze the elements present in unknown astronomical objects. We observed that Moon One had hydrogen, helium, and carbon present, while Moon Two had hydrogen, helium, lithium, sodium, carbon, and nitrogen present. Planet One had hydrogen, helium, lithium, sodium, and carbon present, while Planet Two had hydrogen, helium, lithium, sodium, carbon, and nitrogen present.

It is essential to use many types of equipment when studying space because the electromagnetic spectrum is made up of many different wavelengths and frequencies, and each one provides different information. If carbon was the most common element found in the moons and planets, oxygen would be missing, which is necessary for the carbon cycle to occur. The electromagnetic spectrum helps us find out the make-up of stars by allowing us to detect the different wavelengths and frequencies of light they emit, which can tell us the elements they are composed of.

It is useful to determine the elements that a planet or moon is made up of because it can provide insight into the planet's atmosphere, climate, and potential for life. Knowing the elements present can also help us understand the history of the planet or moon, such as how it was formed and how it has evolved over time.

The speed of the ambulance is 4.61 m/s.

Doppler's effect formula is used, which is

\(f' = f (\frac{v + vo}{v + vs})\)

Where,

f' = observer frequency of sound

f = actual frequency of sound waves

v = speed of sound waves

vo = velocity of observer

vs = velocity of source

Here, observer is the cyclist and source is the ambulance.

Given,

f' = 1590 Hz

f = 1600 Hz

v = 343 m/s

vo = 2.44 m/s

Now put the given values in the above formula,

\(f' = f (\frac{v + vo}{v + vs})\)

\(1590 = 1600 (\frac{343 + 2.44}{343 + vs})\)

\(1590 = 1600( \frac{345.44}{343 + vs})\)

\(1590 = \frac{552,704}{343+vs}\)

\(343+vs = \frac{552,704}{1590\\}\)

\(343 + vs = 347.61\\\)

\(vs = 347.61 - 343\)

\(vs = 4.61 m/s\)

Hence, the speed of the ambulance is 4.61 m/s.

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The semi-major axis of an ellipse is half the length of the longest diameter of the ellipse.

The semi-major axis of an ellipse is a fundamental parameter that determines its shape and size. It is defined as half the length of the longest diameter of the ellipse. The diameter of an ellipse is any line segment that passes through the center and has endpoints on the boundary of the ellipse. The longest diameter, also known as the major axis, is the diameter that has the largest length among all possible diameters of the ellipse.

To find the semi-major axis, we take half the length of the major axis. The major axis passes through the center of the ellipse and is the longest distance between any two points on the ellipse. By halving the length of the major axis, we obtain the semi-major axis, which represents the distance from the center to either focus of the ellipse.

The foci of an ellipse are two fixed points located on the major axis, equidistant from the center. The semi-major axis is indeed the distance between these two foci, as it is half the length of the longest diameter, which connects them. Thus, the semi-major axis provides a concise measure of the size and shape of an ellipse.

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Answer:

\(\boxed {\boxed {\sf D. \ 6.02*10^{23} \ atoms}}\)

Explanation:

One mole of a substance contains the same amount of representative particles. These particles can be atoms, molecules, ions, or formula units. In this case, the particles are atoms of titanium.

Regardless of the particles, there will always be 6.02*10²³ (also known as Avogadro's Number) particles in one mole of a substance.

Therefore, the best answer for 1 mole of titanium is D. 6.02*10²³ atoms.

Answer:

D) 6.02 x 1023

Explanation:

A.P.E.X

The net force acting on an object is the sum of all the forces acting on it. When forces act in the same direction, they add up and result in a greater net force on the object.

Conversely, when forces act in opposite directions, they subtract from each other, resulting in a smaller net force on the object.

For example, if a car is being pushed by two people, one pushing from the front and one from the back, the forces are acting in opposite directions. The force in the forward direction is countered by the force in the backward direction, resulting in a smaller net force on the car.

On the other hand, if both people push the car in the same direction, the forces add up, resulting in a greater net force on the car. This difference in net force can affect the object's acceleration and speed.

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The refractive index and the extinction coefficient of a material can be used to calculate its complex permittivity, which is a measure of the material's ability to store electric energy.

It is defined as the ratio of the electric flux density (D) to the electric field strength (E) in a vacuum and has units of farads per meter (F/m). In a material, the electric field is partially screened by the material's electrons, leading to a reduction in the effective electric field.  The complex permittivity is given by the following equation:

ε = ε' - jε'' = n^2 - jk,

where ε' is the real part of the permittivity, ε'' is the imaginary part of the permittivity, n is the refractive index, and k is the extinction coefficient.

So, to obtain the real and imaginary parts of the permittivity, one can simply use:

ε' = n^2

ε'' = k

where n and k are the known refractive index and extinction coefficient, respectively.

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The amount of work required to haul up the rope is 30.72 Nm. This can be calculated by multiplying the weight of the rope (0.624 N/m) by the length of the rope (50 m).

The work required to haul up the 50 m length of rope weighing 0.624 N/m is 30.72 Nm. This can be found by using the equation Work = Force x Distance.

The force is the weight of the rope, which is 0.624 N/m, and the distance is the length of the rope, which is 50 m. When multiplied together, the resulting work is 30.72 Nm.

Hauling the rope up will therefore require an expenditure of energy equal to 30.72 Nm.

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Answer:

increase distance

Explanation:

Inclined planes make it easier to move objects to a higher elevation. The sloping surface of the inclined plane supports part of the weight of the object as it moves up the slope. As a result, it takes less force to move the object uphill.

Answer:

Hello your answer would be increase of distance

Explanation:

I know that because than you would have to go upward with the object.