Noah and Nina are 15 m apart in a closed room. Noah says the same sentence twice. The first time, Nina does not hear the sound, but she does hear the sentence the second time.

What best describes the difference between the second sound wave and the first?

Answer: 501.57g

Explanation: g=1.06×473.176

The set of two charges experiencing the strongest attraction is charges of +2 C and -2 C, separated by 1 m. Option A.

+2 C and -2 C is an attracting force because the charges are opposite

For Charges of +2 C and -2 C the force of attraction between two charges is directly proportinal to the product of their charges and inversely proportional to the square of the distnce between them.

The product of the charges is 2 × -2 = -4 C², and the square of the distance between them is 1² = 1 m².

The force of attraction between these two charges is -4 / 1 = -4 N.

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Answer:

Explanation:

Well mathematically it would look like this

E = k * I

k is the constant of proportionality.

As the voltage goes up, so does the current.

As the voltage goes down, so does the current.

In physics and engineering,, the formula is written somewhat differently.

E = I * R

The R is a device which limits the current. If R = 0 (like it is just a switch closing) then the first thing you will notice is that the lights go out and you better know where the circuit breakers are and have a flashlight to see which one you shorted out.

So R has a value > 0 in practice.

The secondary coil should have approximately 11.19 windings to provide the 6.7367 V required by the electric train when connected to a 108.246 V household circuit.

To determine the number of windings in the secondary coil of the transformer, we can use the formula for transformer voltage:

\(V_{secondary}/V_{primary}=N_{secondary}/N_{primary}\)

where V_secondary is the voltage across the secondary coil, V_primary is the voltage across the primary coil, N_secondary is the number of windings in the secondary coil, and N_primary is the number of windings in the primary coil.

We are given that the primary coil has 180.294 windings and is connected to a 108.246 V household circuit. We also know that the electric train requires 6.7367 V to operate. Therefore, we can set up the equation:

\(\frac{V_{secondary}}{108.246\text{ V}} = \frac{N_{secondary}}{180.294}\)

Solving for N_secondary, we get:

\(N_{secondary} = \frac{V_{secondary}}{108.246\text{ V}} \times 180.294\)

We can substitute the voltage required by the train, V_secondary = 6.7367 V, into this equation and solve for N_secondary:

\(N_{secondary} = \frac{6.7367\text{ V}}{108.246\text{ V}} \times 180.294\)

N_secondary ≈ 11.19

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The volume of the liquid sample is given as 1.70 L. We need to convert this to milliliters (ml) as the density is given in grams per milliliter (g/ml). We know that 1 L = 1000 ml. Therefore, the mass of the 1.70 L sample of liquid with a density of 0.921 g/ml is 1565.7 g.

To find the mass of the liquid sample, we can use the formula:
Mass = Density x Volume
Volume = 1.70 L x 1000 ml/L = 1700 ml
Now, we can substitute the values into the formula:
Mass = 0.921 g/ml x 1700 ml
Mass = 1565.7 g
Therefore, the mass of the 1.70 L sample of liquid with a density of 0.921 g/ml is 1565.7 g.
In conclusion, the mass of the liquid sample is found by multiplying the density of the liquid with the volume of the liquid sample. The given density of the liquid in g/ml was converted to ml to match the given volume of the sample. The mass of the sample was calculated to be 1565.7 g.
To find the mass of a 1.70-liter sample of a liquid with a density of 0.921 g/mL, you can use the formula:
Mass = Volume × Density
First, we need to convert the volume from liters to milliliters (1 L = 1000 mL):
Volume = 1.70 L × 1000 mL/L = 1700 mL
Next, we can calculate the mass:
Mass = 1700 mL × 0.921 g/mL = 1565.7 g
So, the mass of the 1.70-liter sample of the liquid is approximately 1565.7 grams.

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Answer:

The Sunflower, and the tree

Explanation:

they consume carbon dioxide, and produce oxygen.

The angle of refraction is a. 15°

Snell's law is described as “The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for the light of a given colour and for the given team of media”.

By Snell's law:

η = sin i / sin r. i = 25, η = 1.6

1.6 = sin25° / sin r

sin r = sin25° / 1.6

= 0.4226/1.6= 0.2641

calculating

r = sin⁻¹( 0.2641 )

sin−1(0.264) is ≈ 15.3075

the angle of refraction is a. 15°

So the angle associated with the incidence and refraction can have a relation to the refractive index of the two mediums. Snell's First Law: It states that the incident ray, the refracted ray and the standard lie on the same plane.

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The impulse of a bullet is the product of the force and the time for which it is applied to the object. The impulse of a bullet can be calculated using the equation.The impulse of the bullet is 0.8 Ns.

 Impulse = Force x Time.The given question states that a 0.001 kg bullet is fired with a velocity of 800 m/s into a soft wood of mass 1 kg, resting on a smooth surface. To calculate the impulse of the bullet, we need to determine the force applied to the wood by the bullet during the time of impact.First, let us find the initial momentum of the bullet, which is:Initial momentum = mass x velocity = 0.001 kg x 800 m/s = 0.8 kg m/sWhen the bullet hits the wood, it comes to rest. Therefore, the final velocity of the bullet is 0 m/s. To find the force exerted on the wood, we can use the law of conservation of momentum.

The total momentum of the system before the collision is equal to the total momentum of the system after the collision, which is:Initial momentum of bullet = Final momentum of bullet + Momentum of wood0.8 kg m/s = 0 + (mass of wood) x (final velocity of wood)We know that the mass of wood is 1 kg and the final velocity of wood is unknown. Solving for final velocity of wood gives:Final velocity of wood = 0.8 m/sSo, the change in velocity of the wood is:Δv = final velocity - initial velocity = 0.8 m/s - 0 m/s = 0.8 m/sThe time of impact can be calculated using the equation:Time = Δv / aWhere, a is the acceleration of the wood, which can be found using the equation:F = maF = mΔv / tTherefore,a = F / m = (mΔv / t) / m = Δv / tSubstituting the given values, we get:a = 0.8 m/s / 0.001 s = 800 m/s²The time of impact is:Time = Δv / a = 0.8 m/s / 800 m/s² = 0.001 sTherefore, the force exerted on the wood by the bullet is:F = ma = 1 kg x 800 m/s² = 800 NThe impulse of the bullet can be calculated using the equation:Impulse = Force x Time= 800 N x 0.001 s= 0.8 NsAnswer: The impulse of the bullet is 0.8 Ns.

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Answer:

True

Explanation:

Velocity is a vector quantity, which means that it carries both magnitude and direction. Hence when direction of a particle changes, although magnitude (speed) may remain same, it's velocity changes due to direction change. For ex. A particle is m... A particle is moving along x axis with speed 1m/s, it's velocity will be represented as 1i (i represents unit vector along x)

But if it now starts moving along y axis, it's velocity is 1j (j represents unit vector along y axis). Hence velocity changes with direction.

brainllest pls .

Answer:

yes.................

A stationary source of light emits light at a speed of 300,000 km/sec.

Is there anything that moves more quickly than light?

No object can go more quickly than 300,000 kph (186,000 miles per second). Only massless particles, such as the photons that constitute light, are capable of traveling at that speed. Any material item cannot be accelerated to the speed of light since doing so would require a limitless supply of energy.

The exact distance that light travels in a vacuum at in a second is 299,792,458 meters (983,571,056 feet). This is roughly 186,282 miles per second, or "c," the symbol for light speed in mathematics.

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Answer:

5 m/s

Explanation:

Given that,

A vehicle is moving with 20m/s towards the east and another is moving 15m/s towards the west​.

It is assumed to find the resultant velocity of the vehicle. Let east side is positive and west is negative. So,

\(v=v_1+v_2\\\\=20+(-15)\\\\=5\ m/s\)

Hence, the resultant velocity of the vehicle is equal to 5 m/s.

Answer:

the cause of variation gravity

Answer:

Heavier Objects Don't Hit the Ground First

Since there is less friction in this situation, we can say that the end speed will be 12.8 m/s because the complete energy has been conserved.

English definition of frictionless: devoid of friction (= the force that prevents an object from moving through or across something): The the ends of the bones in the joints are covered by cartilage, which allows for almost frictionless movement.

The term "frictionless surface" refers to a surface type where the force acting on any object that makes it challenging for the object to slide is now almost zero or negligible, i.e., where there is no resistance between the surface and substance designed to allow the object to slide as well as move freely without any friction.

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The star is moving away from Earth at a velocity of 1.8 x 106 m/s.

The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.

The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.

The velocity of a star moving away from Earth can be determined using the equation:

v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).

In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.

The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.

Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.

Therefore, velocity of star 1.8 x 106 m/s.

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A. The woman has a farsighted vision problem (also called hyperopia).

B.The focal length of eyeglass lenses needed to correct her problem is 12.5 cm.

C. The man has a nearsighted vision problem (also called myopia).

D. The focal length of eyeglass lenses needed to correct his problem is 30 cm.

A. The woman has a farsighted vision problem (also called hyperopia). This is because she can only produce sharp images on her retina for objects that are relatively far from her eyes (150 cm to 25 cm).
B. To correct her farsightedness, we can use the lens formula: 1/f = 1/u + 1/v. Here, f is the focal length of the eyeglass lens, u is the object distance (25 cm, the closest distance she can see clearly), and v is the image distance (the desired near point of 25 cm). Solving for f:
1/f = 1/25 + 1/25
1/f = 2/25
f = 25/2 = 12.5 cm
The focal length of eyeglass lenses needed to correct her problem is 12.5 cm (converging lenses).
C. The man has a nearsighted vision problem (also called myopia). This is because he can only produce sharp images on his retina for objects that are 3.0 m or more from his eyes.
D. To correct his nearsightedness and allow him to read a book held 30 cm from his eyes, we again use the lens formula:
1/f = 1/u + 1/v
In this case, u is the object distance (300 cm, as he can see clearly at 3.0 m), and v is the desired near point (30 cm). Solving for f:
1/f = 1/300 + 1/30
1/f = 1/30
f = 30 cm
The focal length of eyeglass lenses needed to correct his problem is 30 cm (diverging lenses).

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a) The efficiency of this carnot engine = 0.672 = 67.2%

Carnot heat engine converts 67.2% of the heat it receives to work.

b) The amount of heat rejected to the sink per cycle = 164 kJ

\(Q_{H}\) = 500 kJ

Efficiency of this carnot engine =?

Amount of heat rejected to the sink per cycle =?

a) Carnot heat engine is a reversible heat engine; its efficiency can be calculated from:

\(n_{th,rev} = 1 - \frac{T_{L} }{T_{H} }\)

\(n_{th,rev} = 1 - \frac{(30+273)K}{(652+273)K}\)

= 0.672

The efficiency of this carnot engine = 0.672 = 67.2%

b) The amount of heat rejected \(Q_{L}\) by heat reversible engine can be calculated from:

​\((\frac{Q_{H} }{Q_{L} } )_{rev} = \frac{T_{H} }{T_{L} }\)

\(Q_{L,rev} = \frac{T_{L} }{T_{H} } Q_{H,rev}\)

= \(\frac{(30+273)K}{(652+273)K} (500KJ)\)

= 164KJ

Carnot heat engine converts 67.2% of the heat it receives to work.

The amount of heat rejected to the sink per cycle = 164 kJ

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The maximum height the shot will reach is 3.08 m (2.20 m + 68.0 cm).

Calculate the initial velocity of the shot. Since the shot is initially at rest, the initial velocity is 0 m/s.

Calculate the time it takes for the shot to reach the maximum height. This can be calculated using the formula: t = (vf - v0) / a, where vf is the final velocity, v0 is the initial velocity, and a is the acceleration. In this case, vf = 0 m/s, v0 = 0 m/s, and a = 40.0 m/s2. Therefore, t = 0 / 40.0 m/s2 = 0 s.

Calculate the maximum height the shot will reach. This can be calculated using the formula: h = v0t + (1/2)at2. Since v0 = 0 m/s, t = 0 s, and a = 40.0 m/s2, h = 0 + (1/2)(40.0)(0)2 = 0 m. Therefore, the maximum height the shot will reach is 0 + 2.20 m = 2.20 m + 68.0 cm = 3.08 m.

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Answer:

Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement.

Explanation:

Answer:

Speed refers to the distance taken at a specific time interval. Velocity is the speed in a certain direction.

Sound is a mechanical wave. it  can pass through the string. That is way, the sound travels along the string to Zoe.

A mechanical wave is a wave in physics that involves the oscillation of matter and transmits energy across a medium. While waves can travel great distances, the transmission medium—the material—can only move so far.

The oscillating material stays close to its initial equilibrium position as a result. Only medium with elasticity and inertia can form mechanical waves. Transverse, longitudinal, and surface waves are the three different forms of mechanical waves. Water, sound, and seismic waves are a few of the most prevalent types of mechanical waves.

As sound is a mechanical wave, it can pass through solid, liquid and gas. As in the string, there has a tension force acting, the sound can easily move along the string to Zoe.

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Yes, the object is able to have zero velocity and non-zero acceleration at the same time.

From acceleration theory, we know that acceleration is the change of speed in a moment. We can determine as

a = dv / dt

It means that the velocity can be zero in the final condition or the initial condition. For example, the car is traveling to a mountain and falls down in that time the car got a minus acceleration until having zero velocity and then the velocity goes to a minus value and the car falls down.

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a. True If two vectors are perpendicular to each other, their cross product must be zero.

The vector is always equal to its cross-vector product. A line that is perpendicular to another line will create an angle of 900 degrees between them. As a result, even if two provided vectors are perpendicular, their cross product does not equal zero, but their dot product does.

A 90 degree angle is created between two vectors when they are perpendicular to one another. As we all know, the cross product of two vectors is equal to the product of the magnitudes of the vectors and the sine of the angle between them.

The dot product of two vectors that are perpendicular to one another is equal to zero.

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Answer:

Asteroids and comets have a few things in common. They are both celestial bodies orbiting our Sun, and they both can have unusual orbits, sometimes straying close to Earth or the other planets. They are both “leftovers” — made from materials from the formation of our Solar System 4.5 billion years ago. But there are a few notable differences between these two objects, as well. The biggest difference between comets and asteroids, however, is what they are made of.

While asteroids consist of metals and rocky material, comets are made up of ice, dust, rocky materials and organic compounds. When comets get closer to the Sun, they lose material with each orbit because some of their ice melts and vaporizes. Asteroids typically remain solid, even when near the Sun.

Right now, the majority of asteroids reside in the asteroid belt, a region between the orbits of Mars and Jupiter which may hold millions of space rocks of varying sizes. On the other hand, the majority of comets are in the farthest reaches of our Solar System: either 1. in the Kuiper Belt — a region just outside the orbit of the dwarf planet Pluto that may have millions of icy comets (as well as many icy dwarf planets like Pluto and Eris); or 2. the Oort Cloud, a region where trillions of comets may circle the Sun at huge distances of up to 20 trillion kilometers (13 trillion miles).

Answer:

they are both leftovers materials

Explanation:

think about how the solar system is made the comets and asteroids are both rocks and remains of the solar system

the correct answer is probably 70km

The magnitude of the force is approximately \(-4.03 * 10^{-5} N\) and the negative sign indicates that the force is attractive.

The magnitude of the force between Fluffy's fur and her plastic brush can be determined using Coulomb's Law, which states that the force between two charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. In this case, the charges are \(+8.0 * 10^{-9}\) coulombs (q1) and \(-1.4 * 10^{-8}\)coulombs (q2), and the distance between them is\(5.0 * 10^{-1}\) meters (r). Thus, the formula to calculate the force is:
F =\(k * (q1 * q2) / r^2\)
Where k is Coulomb's constant, which is equal to \(9 * 10^9 Nm^2/C^2\). Substituting the values given in the problem, we get:
F = \(9 * 10^9 * (8.0 * 10^{-9}) * (-1.4 * 10^{-8}) / (5.0 * 10^{-1})^2\)
F ≈ \(-4.03 * 10^{-5} N\)
The negative sign indicates that the force is attractive, meaning that Fluffy's fur and her plastic brush are being pulled towards each other.

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The behavior of a wildfire is typically described by b) intensity and spread.

Wildfire behavior refers to the way the fire responds to the various factors that influence its spread and movement. The behavior of a wildfire is typically described by two main characteristics, which are intensity and spread. Intensity refers to the heat output of the fire and its potential for ignition and combustion. Spread, on the other hand, is the rate at which the fire is moving and how far it has spread. The intensity of a wildfire is influenced by several factors, including the type of fuel, weather conditions, and topography.

High-intensity wildfires tend to occur in areas with abundant and dry fuel, high temperatures, low humidity, and high winds, they can be dangerous and difficult to control, and they often result in significant damage to the environment and human communities. Spread is influenced by the same factors as intensity, as well as the presence of firebreaks, the availability of resources, and the tactics used by firefighting personnel. The speed and direction of the fire can vary greatly depending on the surrounding conditions, and it is important to monitor and assess these factors in order to manage the fire effectively. So therefore the behavior of a wildfire is typically described by b) intensity and spread.

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Formula: s = d/t

s = speed

d = distance

t = time

Solve using the values we were given.

s = 125/2

S = 62.5km per hour

Best of Luck!

The material that should be used on a bicycle ramp to increase friction is option b) rough paper.

Rough paper has a large number of tiny, unevenly-shaped fibers which create a large amount of friction. This makes it ideal for bike ramps as it helps to slow and control the speed of a bicycle while they travel on the ramp. Additionally, rough paper is lightweight and easy to work with, making it ideal for creating ramps.

To ensure the best results, you should use thick, high-quality paper with a large number of tiny fibers. This will create more friction, allowing for better control and more stability for the cyclist. Additionally, you should ensure that the paper is securely attached to the ramp so that it doesn’t slip or move while the cyclist is on the ramp.

Overall, the best material to use on a bicycle ramp to increase friction is rough paper. Its numerous tiny fibers provide plenty of friction, while its lightweight and easy installation make it ideal for bike ramps. With the right paper and installation, you can ensure that cyclists have the best experience possible when using your ramp.

Therefore, the best material to use on a bicycle ramp to increase friction is rough paper.

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The magnitude of the force acting on each object is equal to 3.87 x 10-8 N.

The magnitude of the force acting on each object can be calculated using Coulomb's law, which states that the electrostatic force (F) between two point objects with charges (q1 and q2) is equal to the product of the electric constant (k) and the product of the charges divided by the square of the distance (r) between them.

Thus, the formula for calculating the force is F = k(q1q2)/r2. In this case, the charges are both -42 nC, and the distance is 0.46 m. The electric constant is 8.99 x 109 Nm2/C2. Thus, the magnitude of the force acting on each object is equal to 3.87 x 10-8 N

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