if it takes 3.5 hours for the Hogwarts Express, moving at a speed of 120 mi/hr, to make it from Platform 9 and 3/4 to Hogwarts, how far apart are they?​

Answer: To determine the speed of an object, you need to know the distance traveled and the Time = 4.0 seconds The speed of the cheetah in miles per hour is 63 mph 5. How far can a person run in 15 minutes if he or she runs at an average .

Explanation: I hope that was helpful !

Explanation:

An exothermic reaction is a "reaction for which the overall standard enthalpy change ΔH⚬ is negative." Exothermic reactions usually release heat and entail the replacement of weak bonds with stronger ones.

Answer:

Soluble - salt

Insoluble - sand and stapler pins

Explanation:

The salt is soluble because it is an ionic solid which ready dissolves in water to form a solution.

The sand is insoluble because, it is a non-metallic solid which does not readily dissolve in water while, the stapler pin is insoluble because it is a metallic solid which does not readily dissolve in water.

Answer:

true i cant explain it tho

Answer:

false

Explanation:

The Direction Of The Unbalanced Force.

The momentum of an object is calculated as the product of its mass and velocity. In this case, the freight car has a mass of 20,000 kg and is moving with a constant speed of 15 m/s.

To determine the momentum, we multiply the mass by the velocity:
Momentum = Mass * Velocity
Momentum = 20,000 kg * 15 m/s
Momentum = 300,000 kg·m/s
Therefore, the momentum of the freight car is 300,000 kg·m/s. Momentum is a vector quantity, meaning it has both magnitude and direction. In this case, since the car is moving along a straight line with constant speed, the momentum is purely in the direction of the car's motion. The magnitude of the momentum is given by 300,000 kg·m/s, and the direction is along the direction of the car's motion. Momentum is an important concept in physics as it is conserved in isolated systems and plays a role in collisions and interactions between objects.

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Answer:

To convert 400 mm to m you can apply the formula [m] = [mm] / 1000; use 400 for mm. Thus, the conversion 400 mm m is the result of dividing 400 by 1000. 0.4

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The significance of a source in research is crucial as it determines the reliability and validity of the information presented. A credible source is important because it ensures that the information presented is accurate and trustworthy.

Using sources that are not credible or reliable can lead to the spread of misinformation, which can have practical consequences such as wrong decisions and actions based on incorrect information. Theoretical consequences could include flawed research or faulty arguments. It is important to consider the limitations, objections, or weaknesses of a source, as these can undermine its significance. This includes evaluating factors such as bias, sample size, and methodology used in the research.

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--The complete Question is, Identify the significance of the source—why is it important?—what practical or theoretical consequences might follow from the main point?—what limitations, objections, or weaknesses might be present that could serve to undermine the significance of the source?--

Answer:

Explanation:

According to snell's law the incident normal and refracted ray at the point of incidence all lie in the same plane

Given

incident angle i= 60°

refracted angle r= ?

index of refraction u= 1.53.

Applying the formula

\(u= \frac{sine (i)}{sine( r)}\)

solving for r

\(1.53=\frac{ sine (60)}{ sine( r)}\\\1.53= \frac{0.866}{ sine( r)} \\\ sine( r)= \frac{0.866}{1.53} \\\sine(r)= 0.566\\\r= sine^-0.566\\\r= 34.47\)

r= 34.47°

Ductility determines whether a material or structure can safely withstand a load without breaking or suffering damage.

A material's ductility is a mechanical property that refers to how easily it can be drawn from. In the field of materials science, ductility refers to how much plastic deformation under tensile stress a material can withstand before breaking. Ductility is a top priority in both engineering and manufacturing.

It describes a material's suitability for specific manufacturing processes (like cold working) and its capacity to withstand mechanical overload. Among the metals that are frequently referred to as ductile are copper and gold. Not all metals, like cast iron, can fail brittlely; some can instead fail ductilely. Polymers can be thought of as ductile materials because they typically allow for plastic deformation.

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Answer:

A) Gravity.

Explanation:

Earth is stuck in orbit around the sun, because of the Sun's gravitational pull. In this scenario, the string represents gravity, keeping the Earth attracted towards the sun.

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The student ties a string around a weight and swings the weight in a circle around her body. If the student represents the sun and the weight represents earth, the string will represent GRAVITY then.

In mechanics, gravity—also known as gravitation—is the constant force of attraction that pulls all things together. It has little impact on determining the intrinsic characteristics of common stuff because it is by far the weakest known force in nature.

In contrast, it governs the formations and evolution of stars, galaxies, and the entire cosmos by its extensive and ubiquitous action, which affects the trajectories of objects in the solar system and beyond the universe. All objects on Earth experience weight, or a gravitational pull that is proportionate to their mass and is imposed by the planet's mass.

As the student represents the sun and the weight represents earth, the string will represent GRAVITY then. Hence, option (A) is correct.

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The force that is needed to accelerate the arrow is 49 Newtons.

To determine magnitude of the force needed to give a 0.25 kg arrow an acceleration of 196 m/s², we can use the equation of force:

F = ma

where F is the force, m is the mass, and a is the acceleration.

Given that m = 0.25 kg and a = 196 m/s², we can substitute these values into the equation and solve for F:

F = (0.25 kg)(196 m/s²)

F = 49 N

So the force needed to give a 0.25 kg arrow an acceleration of 196 m/s² is 49 N. This is the correct answer out of the options given.

To arrive at this answer we used Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration. Thus, we were able to use the equation "F = ma" (where F is force, m is mass and a is acceleration) to solve for the force required to accelerate the arrow at 196 m/s².

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The minimum amplitude of the resultant pulse is 10 cm.

The amplitude of a pulse is the maximum height of the waveform measured from the baseline, also known as the peak-to-peak amplitude. In the case of two pulses, A and B, the minimum amplitude of the resultant pulse is determined by the vector sum of the individual amplitudes of the two pulses.

When two pulses are in phase, the resultant pulse amplitude is the sum of the individual amplitudes, which in this case is 20 cm + 10 cm = 30 cm.

However, if the two pulses are out of phase, the minimum amplitude of the resultant pulse is determined by the difference between the amplitudes of the two pulses. In this case, the minimum amplitude of the resultant pulse would be |20 cm - 10 cm| = 10 cm.

So, the minimum amplitude of the resultant pulse is 10 cm.

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Answer:

b

Explanation:

The formula for work done (W) is:

W = Force x Distance moved in the direction of force

This means that the object needs to move in the direction of the force, otherwise no work is done in that direction.

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Answer:

The shadow would be on your left side.

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10 w night light left on for 18 hr is consumes more energy.

a 1 kw hair dryer used for 10 min.

energy consumes = 1kw * 10* 60 = 600kJ.

a 10 w night light left on for 18 hr

18Hr = 18 * 60 * 60 = 64800 sec

Energy consumes = 10 * 64800 =648000 J. = 648 kJ.

Since, 10 w night light left on for 18 hr consumes more energy.

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Answer:

45

Explanation:

because you divide volume and mass

The Milky Way galaxy is the home of the Sun. Over 100,000,000,000 stars are thought to be present in the Milky Way alone, according to astronomers.

One of the many billions of galaxies in the cosmos is the Milky Way galaxy. The universe is a large region of space that houses everything that has ever existed. All the galaxies, stars, and planets are in the cosmos. Unknown is the precise size of the universe. According to scientists, the universe is still growing. At least 100 billion stars, including our Sun, make up the Milky Way, a spiral galaxy with a diameter of around 100,000 light-years. We are located in one of the four primary arms of the pinwheel-shaped constellation of stars, roughly two thirds of the way from the center. It is believed that the majority of the stars in our galaxy are home to their own families of planets.

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A parametrization of a curve in the xy plane is a method of expressing the coordinates of each point on the curve as functions of a single parameter.

A parametrization of a curve in the xy plane is a method of expressing the coordinates of each point on the curve as functions of a single parameter. When a curve is given in terms of parametric equations, it is possible to define the curve using a set of parametric equations.

A curve is defined as a continuous function of at least one variable. A curve in the xy-plane is a graph that consists of a set of points (x,y), where x and y are real numbers.

A parametric curve is a curve that is defined using parametric equations, which are equations that express the coordinates of each point on the curve as functions of a single parameter. The parameter is usually denoted by t, but it can be any letter or symbol.

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The total resistance of the circuit is the sum of the resistance of the two bulbs. Using Ohm's law, we can find the current through the circuit: So, the answer is: B. the current in the 100-W bulb is less than that in the 25-W bulb

I = V / R

where I is the current, V is the voltage, and R is the resistance.

Let's first calculate the resistance of each bulb:

For the 25W bulb:

P = \(V^2\) / R

R = \(V^2\) / P = (110 \(V)^2\) / 25 W = 484 ohms

For the 100W bulb:

P = \(V^2\) / R

R = \(V^2\)/ P = (110 \(V)^2\) / 100 W = 121 ohms

The total resistance of the circuit is:

R_total = R_25W + R_100W = 484 ohms + 121 ohms = 605 ohms

The current through the circuit is:

I = V / R_total = 110 V / 605 ohms = 0.182 A

The voltage drop across each bulb can be found using Ohm's law:

V_25W = I * R_25W = 0.182 A * 484 ohms = 88 V

V_100W = I * R_100W = 0.182 A * 121 ohms = 22 V

Therefore, the 25W bulb has a greater voltage drop and will be brighter than the 100W bulb.

So, the answer is: B. the current in the 100-W bulb is less than that in the 25-W bulb

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Answer: Down below is the answer in complete sentences!

Explanation:

PART A:

Gravity and Acceleration are two additional forces acting upon the sled.

PART B:

Gravity will affect the sled by pulling it down, since the slope of the hill is negative.

Acceleration will affect the sled by gradually increasing it's speed, since the slope is downwards, which in addition to the initial force exerted plus gravity increases the speed, thus the sled accelerates.

Answer:

The Artemis II mission is part of NASA's broader Artemis program, which aims to land the first woman and the next man on the Moon by 2024. The primary goal of the Artemis II mission is to test the systems and equipment necessary for a crewed lunar landing, including the Orion spacecraft and the Space Launch System (SLS) rocket. Additionally, the mission will provide critical data and experience for future deep space missions, including those to Mars.

The Artemis II mission is an important step towards NASA's ultimate goal of establishing a sustainable human presence on the Moon.

The mission is expected to take place in 2023 and will be crewed by four astronauts. The primary objective of Artemis II is to test the spacecraft's ability to navigate and operate in deep space.

The mission will involve an uncrewed test flight of , which will travel around the Moon before returning to Earth.

This will be the first time that humans have traveled beyond low Earth orbit since the Apollo missions of the 1960s and 70s.

The data and knowledge gained from Artemis II will be critical in paving the way for future manned missions to the Moon, Mars, and beyond. In addition, the mission will also help to develop the technologies needed to support long-duration human missions in deep space.

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Correct answer is,  It takes 150 years for light to travel from one star to the other.

What is light year?

In a year, light travels a distance of one light-year. At a speed of 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year, light travels through interstellar space.

Space distances are measured using the light year because they are so vast that a huge unit of distance is needed.

The expanse of space makes sense. Daily units of measurement are simply too little to accurately calculate distances in space without using a lot of zeros.

For instance, the length of a quarter great circle from the equator to a pole was the original definition of a meter. This indicates that the Earth is approximately 40,000 kilometers in circumference.

Now think about the separation between the Earth and the Sun. It's almost 150,000 kilometers away. The amount is already significant.

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Answer:

\(F_w=1000Hz\)

Explanation:

From the question we are told that:

Frequency \(F=1200\)

Speed \(V_w= \frac{1}{5}*343=>68.6m/s\)

Where speed of sound \(V_s=343m/s\)

Generally the equation for frequency  that echo from the cliff wall is mathematically given by

\(F_w=\frac{V_s-V_0}{Vs+V_w}*F\)

\(F_w=\frac{343-0}{343+68.6}*1200\)

\(F_w=1000Hz\)

Answer:

Its speed increases because the ray is now propagating in a medium with a smaller index of refraction.

Explanation:

the maximum speed of light (in a vacuum) is an universal constant in our universe (as even that is a specific medium : the space-time-continuum). not its actual speed at a specific moment and place (and medium).

so, it can never ever go faster than that. but it will adjust down and then back up again, when it enters and leaves a different medium.

see it that way : the light we see today was generated at the core of the sun. it had to literally squeeze through the rest of the sun to reach the sun's surface. it took it at least 4000 years (!) but up to hundreds of thousands of years to get there. because of the medium that is the sun.

once it reached the surface of the sun and the open vacuum of space, it broke free, "cheered" in relieve and went light speed. and then almost 8.5 minutes later it reached Earth (depending on the season or where the Earth is on its elliptical path around the sun).

When a ray of light enters a glass lens surrounded by air, it slows down due to the change in its direction caused by refraction. As the ray of light exits the glass lens and returns to the air, its speed increases.

This is because the refractive index of air is lower than that of glass, and therefore the speed of light is faster in air. The best explanation for this is: "Its speed increases because the ray is now propagating in a medium with a smaller index of refraction." This statement is consistent with the laws of refraction and the relationship between the speed of light and the refractive index of a material. In summary, when a ray of light enters a glass lens surrounded by air, it slows down due to refraction. As it exits the lens and returns to air, its speed increases due to the difference in refractive indices between the two media. Understanding the behavior of light in different media is important for a wide range of scientific and technological applications.

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Answer:

C. POSITIVE

(Sorry if wrong)

Answer:

C positive

Explanation:

It keeps moving in a positive way over and over

Answer:

450 g =0.9921 lb

Explanation:

The circulation of the line vortex is 4 m/s.  

In a line vortex, the circulation is defined as the product of the velocity of the fluid and the distance from the center of the vortex. To find the circulation of a line vortex, we need to know the velocity of the fluid at a given distance from the center of the vortex.

Assuming that the downward velocity at a point 2 meters orthogonally from the line vortex is 2 m/s, we can use the equation for the velocity of the fluid in a line vortex to find the circulation:

Circulation = 2 * r

where r is the distance from the center of the vortex.

In this case, the velocity of the fluid is 2 m/s and the distance from the center of the vortex is 2 meters. Plugging these values into the equation, we get:

Circulation = 2 * 2 = 4 m/s

Therefore, the circulation of the line vortex is 4 m/s.  

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In order to find the horizontal and vertical components of the given vector, we can use the formulas below:

So, if the magnitude of the resultant vector is 145 m/s and the angle is 55°, we have:

The average speed = 2 m/ s

The distance traveled in 4s is 16m

the constant acceleration is

2. the final speed is 25 m/s

Average speed = distance / time

= 2 + 4 + 6 + 8 / 1 + 2 + 3 + 4

= 20 / 10

= 2

The distance in 4s:

we would solve using the formula

ut + 1/2at^2

0 + 1/2 * 2 * 4^2

= 16 meters

2. If the train is at 10 m /s for 15 s, we would use the formula

v = u + at

u = 10

a = 1

t = 15

then

v= 10 + 1× 15

=v= 25 m/ sec

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