Engineers are using computer models to study train collisions to design safer train cars. They start by modeling an elastic collision between two train cars traveling towards each other. Car 1 is traveling north at 20 m/s and has a mass of 12,745 kg. Car 2 is traveling south at 15 m/s and has a mass of 4,125 kg. After the collision, car 1 has a final velocity of 3 m/s north. What is the final velocity of car 2?

Sound is the perception of vibrations by our ears, while sound waves are the actual physical disturbances that travel through a medium, carrying the energy of sound.

Sound is the sensation that we experience when our ears detect the vibrations produced by an object. It is a subjective experience that varies based on individual perception.

On the other hand, sound waves are the actual physical disturbances that travel through a medium, such as air, water, or solids, in the form of pressure variations. These waves are responsible for transmitting the energy of sound from its source to our ears.

Sound waves possess several properties that define their characteristics. One important property is frequency, which refers to the number of complete oscillations or cycles the wave completes per second and determines the pitch of the sound.

Higher frequencies result in higher-pitched sounds, while lower frequencies produce lower-pitched sounds. Another property is amplitude, which corresponds to the magnitude or intensity of the sound wave. It influences the perceived loudness of the sound, with larger amplitudes corresponding to louder sounds.

The medium through which sound waves travel also affects their speed. In general, sound travels faster through denser mediums. This is because denser materials allow the sound waves to transfer energy more efficiently, resulting in higher propagation speeds.

For example, sound travels faster in water compared to air because water is denser. The speed of sound is also influenced by other factors such as temperature and humidity, which can alter the properties of the medium.

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Answer:

Initial: bring ek, eg and ech all to 2, in the end bring ek, eg up to 3 each

Explanation:

The initial state of the ball, the effect the ball might have on the Earth, and the balls final state. Ek stands for kinetic energy, Eg stands for gravitational potential energy, and Ech stands for chemical change (stored energy in food/fuel), Eint stands for internal energy change.

Kinetic energy is the type of energy present in a body due to the property of its motion and potential energy is the kind of energy present in a body due to the property of its state.

Kinetic energy can be easily transferred from one body to another but potential energy is not transferable. Kinetic energy is relative with respect to nature and potential energy is non-relative with respect to nature.

As the ball is rolling down a ramp, its potential energy decreases and kinetic energy increases.  The ball has the maximum potential energy when it is at the top, and this potential energy is transformed into both translational and rotational kinetic energy as it rolls down.

When the ball is at the topmost height, its gravitational potential energy is maximum and zero kinetic energy. When a ball reaches the bottom of the ramp, it will have zero potential energy and maximum kinetic energy.

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The box with the changing data shows that the acceleration is constant at 4.90 m/s2, but i thought g = 9.80 m/s2.

The acceleration due to gravity (g) is different from the acceleration of the object itself. Although g is usually taken to be 9.8 m/s2, it can vary depending on the object's location and height above the Earth's surface. As a result, a falling object can experience acceleration greater than, less than, or equal to g when air resistance is taken into account or not

In the given scenario, the box is not necessarily in free fall; it could be undergoing linear motion along a surface. Furthermore, the box could be in free fall, but with air resistance affecting its motion. In this situation, the box's acceleration would be less than g.The box's acceleration may have been determined using an accelerometer or a ticker tape. Regardless, the acceleration indicates the rate at which the box's velocity is changing, which may or may not be equal to g.

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Answer:

Hydrothermal vents

Explanation:

A hydrothermal vent is found along with areas of volcanic activity in the ocean floor which discharges geothermally heated water. Tectonic plates in such areas move apart at spreading centers and hotspots to form hydrothermal vent.

A hydrothermal vent ejects hot and often toxic, fluids and gases into the surrounding seawater when seawater meets magma.

Hence, the correct answer is "Hydrothermal vents".

Electrical energy can be described as the energy transferred through the movement of charges, typically in the form of an electric current

define  Electrical energy  ?

Electrical energy is a form of energy that results from the movement of electric charges, typically in the form of an electric current. It is the energy that is transferred or converted from electric potential energy, which is the energy stored in a system due to the separation of charges. Electrical energy can be harnessed and used for various purposes, such as lighting, heating, powering electronic devices, and driving motors. It is an essential form of energy in modern society and plays a crucial role in many aspects of daily life.

The correct answer is 1. Electrical energy can be described as the energy transferred through the movement of charges, typically in the form of an electric current. Options 2, 3, and 4 refer to other forms of energy related to electricity but do not fully describe electrical energy itself.

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Answer:

12.5 m/s North/east

Explanation:

I thought of it as a graph. I basically just found the distance between the points (0,0) and (10, 7.5)!

The resultant velocity of the man is 12.5 m/s.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Velocity of the man: v₁ = 7.5 m/s (due east )

Velocity of the ship: v₂ = 10 m/s. ( due north.)

Hence, the man and the ship move in perpendicular direction.

So,  his velocity relative to the water = the resultant velocity of the man

= √(7.5² + 10²) m/s = 12.5 m/s.

Hence, resultant velocity of the man is 12.5 m/s.

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Here's a ranking of how well each method works, from closest to furthest:

A celestial body, celestial body, star object, or celestial body is a naturally occurring physical entity, association, or structure that exists in the observable universe. However, while a celestial body or celestial body is a single, closely connected and coherent entity, a celestial body or celestial body may be composed of multiple celestial bodies or other objects with substructures, complex and connected low structure.

Examples of celestial bodies are planetary systems, star clusters, nebulae, and galaxies, while asteroids, moons, planets, and stars are celestial bodies. Comets can be identified both as objects and as objects.

It is the body when referring to the frozen core of ice and dust, and the object when referring to the entire comet with its diffuse coma and tail.

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Energy is stored in the electric energy field between the tubes is 58.8  

Total electrical energy stored ν = (Πl∈o)[/ln(b/a)]

= 0.3 × (45)^2 /4 × 8.99 ×  × ln(4/3)

=  58.8

An atom's charged particles can move an item or start an action by using electrical energy. Electrical energy is produced by the transfer of electrons from one atom to another atom.

A toaster or a phone charger is powered by electricity each time you plug them into a wall outlet. Electric eels, lightning, and batteries are more examples of this type of energy. However, electrical energy can also be transformed into other forms of energy, such as the mechanical energy that propels an electric car's acceleration and the thermal energy that warms your toaster and toasts your bread.

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The mass and magnitude of the second particle are calculated below.

The initial velocity of an object is its velocity prior to the effect of acceleration, which causes the change. The velocity will be the final velocity after accelerating the object for some time. When a particle moves at a constant speed, it can be accelerated. When a point object moves in a horizontal circular path at a constant speed, the direction of its velocity vector changes over time. It means that in a uniform circular motion, the object's velocity vector changes over time.

Distance between the charges, r = 3.2 × \(10^{-3}\)m

initial acceleration of first particle, \(a_{1}\) = 7m / \(s^{2}\)

Initial acceleration of second particle, \(a_{2}\) = 9.0m / \(s^{2}\)

Mass of first particle, \(m_{1}\) = 6.3 × \(10^{-7}\)kg

Mas of second particle, m₂ = ?

a) Since, \(F_{1}=F_{2}\)

∴ \(m_{1}a_{1} = m_{2}a_{2}\)

mass of second particle-\(m_{2}\) =\(\frac{m_{1}\times a_{1}}{a_{2}}\)

= \(\frac{6.3\times10^{-7}\times7.0}{9.0}\)

=4.9 × \(10^{-7}\)Kg

b)As, \(F_{1} = F_{2}\)

       = \(\frac{q_{1}q_{2}}{4\pi E_{0}r^{2}}\) = \(m_{1}a_{1}\)

       = 6.3 × \(10^{-7} \times\) 7.0

       = 44.1 × \(10^{-7}\)

∴ q = 7.1 × \(10^{-11}\)C.

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Answer:

that's really hard to answer since we are not you know in the furtue but one could

Answer: True

Explanation: Light enters your eye through the lens which then hits the retina which is located in the back of your eye.

Answer:

The force of gravity = 40 N

Explanation:

Given that,

The mass of a ball, m = 10 kg

The acceleration due to gravity on the surface of Mars, a = 4 m/s²

We need to find the force of gravity of the ball on Mars. The force of gravity on an object is given by :

F = mg

Substitute all the values,

F = 10 kg × 4 m/s²

F = 40 N

Hence, the correct option is (B).

Answer:

239.2 N

Explanation:

Given that a vertical rope is attached to an object that has a mass of 40.0 kg and is at rest.The tension in the rope needed to give the object an upward speed of 3.50 m/s

in 0.700 s is

The tension in the rope and the weight of the mass will be acting in an opposite direction.

T - mg = ma ....... (1)

Where acceleration a = Velocity/ time

a = 3.5 / 0.7

a = 5 m/s^2

Substitutes acceleration a into the equation 1 above.

T - 40 × 9.8 = 40 × 5

T - 39.2 = 200

T = 200 + 39.2

T = 239.2N

Therefore, the tension in the rope needed to give the object an upward speed of 3.50 m/s

in 0.700 s is 239.2N

Answer:

The answer is T=592 N

Explanation:

Fw= 392N

a=v/t, so a=3.5ms^-1/0.7s

a=5ms^-2

Fnet=ma

T-Fw=ma

T-392N=40kg(5ms^-2)

T=592N

Answer: greater than

Explanation:

Answer:

2.53m/s

Explanation:

Initial momentum in a system= Final momentum in a system

65kg*3m/s+12kg*0m/s=(65kg+12kg)*v

195kgm/s=77kg*v

v=2.53m/s

The closest object that can be photographed is 81.63mm and the magnification of this closest object is -0.404.

The focal length of a lens is determined when the lens is focused at infinity. It is obtained from the reciprocal of objects' distance and image distance. Magnification is the enlarged image that is formed over the object size.

From the given,

focal length (f) = 23.5mm

object's distance (u) = 33mm

imagen distance(v) =?

Focal length, (1/f) = 1/u + 1/v

1/v = 1/f - 1/u

    =1/23.5 - 1/33

1/v  = 12.2mm

v = 1/12.2 mm

  = 81.96mm

Thud, the image distance is v= 81.96mm.

Magnification (M) = -v/u

M = -33 / 81.96

  = - 0.402.

Thus, the magnification is -0.402.

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To find the current in the resistor, we can use Ohm's Law and the concept of equivalent resistance. Thus, option A is correct.

First, let's calculate the equivalent resistance of the three cells connected in parallel. When resistors are connected in parallel, the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of the individual resistances:

1/Req = 1/R1 + 1/R2 + 1/R3

Given that R1 = R2 = R3 = 22 Ω (internal resistance of each cell), we can substitute the values:

1/Req = 1/22 + 1/22 + 1/22

1/Req = 3/22

Taking the reciprocal of both sides, we find:

Req = 22/3 Ω

Now we can use Ohm's Law to calculate the current (I) in the resistor. Ohm's Law states that the current flowing through a resistor is equal to the voltage across it divided by its resistance:

I = V/R

Given that V = 1.1 V (emf of each cell) and R = 32 Ω (resistance), we can substitute the values:

I = 1.1/32

Calculating this value, we find:

I ≈ 0.034375 A

Therefore, the current in the resistor is approximately 0.034375 A.

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In a photovoltaic system, an inverter is required to connect the DC current of the solar panel to the AC current of an electrical grid. The correct option is B.

The solar panels in a photovoltaic system generate DC (direct current) electricity. However, most electrical grids operate on AC (alternating current) electricity.

The role of the inverter is to convert the DC electricity produced by the solar panels into AC electricity that can be fed into the electrical grid or used to power electrical devices.

The inverter performs the important function of converting the type of current to match the requirements of the grid, enabling the efficient utilization of solar energy and facilitating the integration of solar power systems with the existing electrical infrastructure.

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Answer:

9 years old and he/she crawl like at 2 years old

The acceleration of the body is 2 \(\frac{m}{s^{2} }\) while the deceleration is - 1.2 \(\frac{m}{s^{2} }\) .

Acceleration can be defined as the rate of change of velocity with respect to time.

Deceleration is the reduction in speed or rate.

It has been stated in the question that the body accelerates for 3s and then decelerates to 2s. This implies that the total time that the object spent in motion is 5 s. So

vf = vi + at

as indicated in the equation ;

vf = final velocity

vi= initial velocity

a = acceleration

t = time taken

So the formula for acceleration will be;

a = \(\frac{vf - vi}{t}\)

a = \(\frac{6 - 0}{3}\)

a= 2 ms⁻²

This is the acceleration of motorcyclist. Now we will find the deceleration as follows;

a =  \(\frac{vf - vi}{t}\)

a= \(\frac{0 - 6}{5}\)

a = -1.2ms⁻²

Your question is incomplete but most probably your full question was;

A motorcyclist starts from rest and reaches a speed of 6 m/s after travelling with constant acceleration for 3s.

a. What is his acceleration?

b The motorcyclist then decelerates at a constant rate for 2s. What is his

acceleration?

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The raw file size for a 320x240 12-bit thermal image is 115,200 bytes. Thermal images have smaller raw file sizes than digital camera images because they have lower resolution and color depth, resulting in less data being stored.

(i) To calculate the raw file size for a 320x240 12-bit thermal image, we need to consider the number of pixels and the bit depth. Each pixel in a 12-bit image can have 2¹² (4096) possible values.

The total number of pixels in a 320x240 image is 76,800 (320 x 240). Multiplying this by the bit depth, we get:

76,800 pixels x 12 bits/pixel = 921,600 bits

To convert this to bytes, we divide by 8:

921,600 bits / 8 = 115,200 bytes

Therefore, the raw file size for a 320x240 12-bit thermal image is 115,200 bytes.

(ii) The file size of a thermal image compared to a typical commercial digital camera image for the visible range is generally smaller due to a couple of reasons:

1. Resolution: Thermal images typically have lower resolution compared to commercial digital camera images. The example given is a 320x240 image.

While commercial digital cameras often capture images with higher resolutions like 12 megapixels (e.g., 4000x3000 pixels). The higher-resolution images from digital cameras contain more data per image, resulting in larger file sizes.

2. Color Depth: Thermal images are often grayscale or have limited color palettes. They usually use a lower bit depth, such as 12 bits, to represent the temperature variations.

In contrast, commercial digital cameras capture images with higher color depth, such as 24 bits (8 bits per color channel), resulting in more information per pixel and larger file sizes.

In conclusion, the raw file size of a thermal image is generally smaller compared to a typical commercial digital camera image due to lower resolution and color depth, resulting in less data being stored for each image.

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Answer:

Total distance traveled by bird is 10.5 km.

Explanation:

Given that,

Velocity of runner= 8.4 km/hr

Distance = 6.3 km

Velocity of bird = 42 km/hr

Suppose, How far does the bird travel?

We need to calculate the time of bird

Using formula of time

\(t=\dfrac{d}{v_{b}}\)

Put the value into the formula

\(t=\dfrac{6.3}{42}\)

\(t=0.15\ hr\)

We need to calculate the distance runner travels during time period

Using formula of distance

\(d=v_{r}\times t\)

\(d=8.4\times0.15\)

\(d=1.26\ km\)

We need to calculate the distance of runner to FL

Using distance

\(d'=6.3-1.26\)

\(d'=5.04\ km\)

We need to calculate the net closing speed between runner and bird

Using speed

\(v'=v_{r}+v_{b}\)

\(v'=8.4+42\)

\(v'=50.4\ km/hr\)

We need to calculate the time for runner and bird to meet

Using formula of time

\(t=\dfrac{d}{v'}\)

Put the value into the formula

\(t=\dfrac{5.04}{50.4}\)

\(t=0.1\ hr\)

We need to calculate the distance covered by runner

Using formula of distance

\(d=vt\)

Put the value into the formula

\(d=8.4\times0.1\)

\(d=0.84\ km\)

We need to calculate the distance covered by bird to runner

Using formula of distance

\(d=vt\)

Put the value into the formula

\(d=42\times0.1\)

\(d=4.2\ km\)

We need to calculate the total distance

Using distance

\(D=6.3+4.2\)

\(D=10.5\ km\)  

Hence, Total distance traveled by bird is 10.5 km.

Answer:

i = 5.28 A

Explanation:

The magnetic force is given by the expression

          F = i l x B

the bold letters indicate vectors, let's write the modulus of that expression, where the direction between the conductor and the magnetic field is 90º, therefore the sine 90 = 1

           F = i l B

           i = F / l B

let's reduce the length to the SI system

           l = 10 cm (1m / 100 cm) = 0.10 m

let's calculate

           i = 12.9 / 0.1 3.6

           i = 5.28 A

Answer: The number of moles of radioactive nuclei remaining after;6.00 hours = 87.5 moles12.067 hours = 54.7 moles48 hours = 2.17 moles.

Initial moles of radioactive nuclei = 175 mol

Half life of the radioactive nuclei = 6.00 h

(a)After six hours, the radioactive nuclei have n half-lives, and their amount is determined by the formula A=A0(1/2)n, where A0 is the initial radioactive nuclei concentration. The quantity of radioactive nuclei still present is A. The total number of half-lives is n. Six hours is a half-life.

Number of half-lives = Time elapsed / Half-life

= 6 / 6= 1A = A0 (1/2)nA

= 175(1/2)¹A

= 87.5 moles of radioactive nuclei

(b) After 12.067 hours: Half-life is 6 hours.

Number of half-lives = Time elapsed / Half-life

= 12.067 / 6

= 2A = A0 (1/2)nA

= 175(1/2)²A

= 54.7 moles of radioactive nuclei

(c) After 48 hours: Half-life is 6 hours.

Number of half-lives = Time elapsed / Half-life

= 48 / 6= 8A = A0 (1/2)nA

= 175(1/2)⁸A

= 2.17 moles of radioactive nuclei.

Therefore, The number of moles of radioactive nuclei remaining after;6.00 hours = 87.5 moles12.067 hours = 54.7 moles48 hours = 2.17 moles

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What characteristics have led humanity to convert most temperate grasslands to use for agriculture or grazing land?

When trees receive sufficient rainfall and grow quickly, they do not overproduce. Because nutrients decompose rapidly, the growing season is relatively long.

Explanation: Brainliest please

An frictionless hemispherical bowl is being traversed by a particle P. When time t = 0, it moves past point A. The horizontal component of its velocity are v at this precise moment. 

What makes speed and velocity different from one another?

Most people mix the terms velocity and velocity in regular speech. These are different concepts that don't share the same significance in physics. Speed has no direction, which is one significant distinction. Speed is therefore a scalar.

Is the term "velocity" a vector term?

In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate. A moving item can never move at a negative speed. A moving item can have zero velocity. The main determinant of an object's quickness is its speed.

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Since the current was inversely proportional to resistance, if one of the resistor is removed, the circuit's overall resistance will drop. The current will therefore grow as the overall resistance decreases.

x = important to mark y Inverse proportion is defined as x y = k or x = k/y. As a result, you can use the measured values to determine the value of a constant k and then apply this method to get all of the unknown values.

Direct proportion means that as one quantity rises or falls, the other quantity also rises or falls. However, in indirect and inverse proportion, if a quantity rises, another falls, and vice versa.

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Answer:

0.03 A

Explanation:

Answer:

30A

Explanation:

I (current)= p (power) / V (voltage)

I= 6.9*10^3 / 230

I= 30A

Answer: the answer is true :-)

Explanation: