given the data, what is the kinetic energy of the system before and after in this elastic collision?

Answer: coal

Explanation:  Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs

Answer:

A wind turbine transforms the mechanical energy of wind into electrical energy. A turbine takes the kinetic energy of a moving fluid, air in this case, and converts it to a rotary motion. As wind moves past the blades of a wind turbine, it moves or rotates the blades. These blades turn a generator

Answer:

final velocity is 70m/s

Explanation:

at = v-u

4 x 15 = v - 10

60 = v - 10

v = 60 + 10

v = 70m/s

Answer:

The combined gas law states that the pressure of a gas is inversely related to the volume and directly related to the temperature. If temperature is held constant, the equation is reduced to Boyle's law. Therefore, if you decrease the pressure of a fixed amount of gas, its volume will increase.

Explanation:

Hope this helps

By breaking the motion into two phases: the acceleration phase and the constant velocity phase, we are able to easily plot our velocity time graph.

Phase 1: Acceleration

During this phase, the car starts from rest and accelerates at a constant rate of 10 meters per second squared until it reaches its maximum velocity.

1. At time t = 0, the car starts from rest, so the velocity is 0.

2. As time progresses, the velocity increases at a constant rate of 10 meters per second squared.

Phase 2: Constant Velocity

After the acceleration phase, the car maintains a constant velocity for 20 seconds.

3. At the end of the acceleration phase, the car reaches its maximum velocity and maintains this velocity for the next 20 seconds.

Based on this information, the velocity-time graph is represented in the image attached.

In this graph:

- The y-axis represents velocity (V) in meters per second.

- The x-axis represents time (t) in seconds.

- The first part of the graph shows a linearly increasing velocity with a slope of 10 m/s².

- After reaching the maximum velocity, the graph shows a horizontal line representing the constant velocity maintained for 20 seconds.

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The correct options for the given regression model are:

b. It is linear regression.

c. It is multiple regression.

The regression model Yt = β0 + β1X1t + β2X2t + β3*X3t + Et is a linear regression model. This means that the relationship between the dependent variable Yt and the independent variables X1t, X2t, and X3t can be represented by a straight line.

The coefficients β0, β1, β2, and β3 represent the intercept and slopes of the line, respectively. Linear regression is a common method for modeling the relationship between a dependent variable and one or more independent variables.

It is widely used in many fields, such as economics, engineering, and social sciences, to make predictions and identify patterns in data. The model is considered simple because it includes only one independent variable and it is linear. However, it can be improved by adding more independent variables to capture more complex relationships.  

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For this regression model, Yt=β0+ β1∗X1t + β2∗X2t+ β3∗X3t +Et,

which one is the correct one? Choose all applied.

a. It is univariate regression.

b. It is linear regression.

c. It is multiple regression,

d. It is simple

Answer:

False:  Wave lengths on the electromagnetic spectrum are "electromagnetic",

They are transverse waves,

Sound waves are "longitudinal" waves and depend on the motion of the medium of transmission for propagation.

Answer:

i think it is 123

The maximum temperature allowed for silicon is 383 degree Celsius.

The intrinsic carrier concentration, ni, in silicon can be determined using the following equation:

ni^2 = Nc * Nv * exp(-Eg/kT)

Rearranging the equation as follows:

T = Eg / (2 * k * ln(ni^2 / Nc / Nv))

The values of Nc and Nv can be calculated using the following equations:

Nc = 2 * [(2πmkT/h^2)^(3/2)]

Nv = 2 * [(2πmkT/h^2)^(3/2)] * exp(-Eg/kT)

Using typical values for the effective masses of electrons and holes in silicon (m_e = 0.26 m_0, m_h = 0.36 m_0, where m_0 is the rest mass of an electron), we can calculate Nc and Nv as:

Nc = 2.81 x 10^19 cm^-3

Nv = 1.83 x 10^19 cm^-3

Substituting these values into the equation for T, we get:

T = (1.12 eV) / [2 * (1.38 x 10^-23 J/K) * ln((1 x 10^12 cm^-3)^2 / (2.81 x 10^19 cm^-3) * (1.83 x 10^19 cm^-3))]

T = 656 K or 383 °C

Therefore, the maximum temperature allowed for silicon with an intrinsic carrier concentration no greater than 1x10^12 cm^-3 is approximately 656 Kelvin or 383 degrees Celsius.

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Answer:

 temperature is -10

Explanation:

Answer:

111dB

Explanation:

First, find the intensity of the sound using the formula I = Power / 4 x pi x radius ^2

So

60.0 / (4 x 3.14 (6.25)^2)

= 0.122

Then plug that into the equation to find sound level, which is 10log( I / Io)

Io being (1 x 10^-12)

So

10log(0.122 / 1 x 10^-12)

= 111dB

Hope this helps :)

Answer:

C: Valence electrons are transferred from a metal to a nonmetal

Explanation:

In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.

hope this was helpful :)

The statement which is false is as follows:

Thus, the correct option for this question is D.

Friction may be defined as a type of force that resists the sliding or rolling of one solid object over another through the surface that acts on it.

Friction is a force that takes place as the resistance of motion when one object rubs over another. Friction force always opposes the motion along with air resistance.

Friction can also be somehow reduced with the impact of lubrication over the rubbing surface. It is true that air resistance is greater the faster the object is traveling.

Air resistance does not depend on the blowing of the wind. It does not mean that if there is no wind blowing, the air resistance is negligible.

Therefore, the correct option for this question is D.

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Answer:

985 kg/m3

Explanation:

The average density of the human body is 985 kg/m3 k g / m 3 , and the typical density of seawater is about 1020 kg/m3 k g / m 3 .

Explanation:

the worldwide human population density is around 7,500,000,000 ÷ 510,000,000 = 14.7 per km2 (38 per sq. mi.). If only the Earth's land area of 150,000,000 km2 (58,000,000 sq. mi.) is taken into account, then human population density is 50 per km2 (129 per sq.

The time on the surface of an object would run most slowly on an object with the same mass as the Sun but twice as large in radius.

What is mass?

Mass is a measure of the amount of matter in an object and is typically expressed in kilograms (kg). It is an intrinsic property of matter and is different from weight, which is a measure of the force of gravity acting on an object. Mass is an important factor in determining the physical properties of an object, such as density, momentum, and inertia. Mass is also used to calculate the gravitational force between two objects, as well as the energy required to move it.

This is because the surface gravity of an object is inversely proportional to the square of its radius. Therefore, the object with the same mass as the Sun but twice as large in radius would have a much lower surface gravity, and time would run more slowly on its surface.

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Las respuestas a cada inciso son:

a) La resistencia equivalente de la "escalera" de resistores iguales de 125 Ω que se muestra en la figura adjunta es:

\(R_{t} = 341.7 \: \Omega\)

b) La corriente a través de cada uno de los tres resistores de la izquierda si se conecta una batería de 50.0 V entre los puntos A y B es:

a) En la imagen adjuntada correspondiente a la Figura 26-40, podemos observar que las resistencias 1, 2 y 3 están en serie, por lo tanto la ressitencia equivalente entre estas 3 es:

\( R' = R_{1} + R_{2} + R_{3} \)

De aquí en adelante tendremos presente que las todas las resistencias son iguales entre sí y por ende igual a 125 Ω. Las notaciones del 1 al 9 son para poder mostrar la resolución del problema.  

Entonces:

\( R' = 3R \)

Ahora, esta resistencia está en paralelo con la resistencia R₄, por lo tanto la resistencia equivalente entre estas dos es:

\( \frac{1}{R''} = \frac{1}{R'} + \frac{1}{R_{4}} = \frac{1}{3R} + \frac{1}{R} = \frac{4R}{3R^{2}} \)

\( R'' = \frac{3}{4}R \)

Luego, esta resistencia está en serie con las resistencias R₅ y R₆, por lo tanto:

\( R''' = R'' + R_{5} + R_{6} = \frac{3}{4}R + 2R = \frac{11}{4}R \)

Esta resistencia está ahora en paralelo con R₇, entonces:

\( \frac{1}{R''''} = \frac{1}{R'''} + \frac{1}{R_{7}} = \frac{4}{11R} + \frac{1}{R} = \frac{15R}{11R^{2}} \)

\( R'''' = \frac{11}{15}R \)

Finalmente, esta resistencis está en serie con las resistencias R₈ y R₉, por lo tanto la resistencia total es:

\(R_{t} = R'''' + R_{8} + R_{9} = \frac{11}{15}R + 2R = \frac{41}{15}R = \frac{41}{15}*125 \: \Omega = 341.7 \: \Omega\)

b) Para este inciso debemos usar la Ley de Kirchhoff, pues tenemos tres mallas. Supondremos que las corriente de cada malla fluiran en sentido horario, por lo tanto las ecuaciones de para cada malla serán:

Malla 1

Segun la ley de Ohm tenemos:

\(V-i_{1}R-i_{3}R=0\) (1)

Malla 2

\(-i_{2}R-i_{5}R-i_{2}R+i_{3}R=0\) (2)

Malla 3

\(-i_{4}R-i_{4}R-i_{4}R+i_{5}R=0\) (3)

Recordemos tambien que:

\(i_{1}=i_{2}+i_{3}\) (4)

\(i_{2}=i_{4}+i_{5}\) (5)

Lo que debemos hacer ahora es resolver el sistema de ecuaciones y encontrar los valore de las corrientes. Por lo tanto, los valores de las corrientes serán:

\(i_{1}=3/13\: A\)

\(i_{2}=4/65\: A\)

\(i_{3}=11/65\: A\)

\(i_{4}=1/65\: A\)

\(i_{5}=3/65\: A\)

Finalmente:

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Answer: The answer is 120 Newton.

The diagram that represents all forces acting on the box on the inclined plane is found in the attachment.

The forces acting on the box on the inclined plane are as follows:

Gravitational force: acting straight down and equal to the weight of the box, which can be calculated as:

W = m*g, where m is the mass of the box (55 kg) and g is the acceleration due to gravity (9.8 m/s^2).

Normal force: acting perpendicular to the surface and equal in magnitude but opposite in direction to the component of the gravity force that is perpendicular to the surface. This force prevents the box from sinking into the surface.

Frictional force: acting parallel to the surface and opposite in direction to the component of the gravity force that is parallel to the surface. This force opposes the motion of the box and is the force that causes it to accelerate.

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Answer: 5 m/s North

Explanation:

Velocity = Momentum/Mass

Velocity = 225 kg*m/s/45kg

Velocity = 5 m/s North

Answer:

The work of the force of friction can be calculated using the equation W = Fd, where W is the work, F is the force, and d is the distance. In this case, the force of friction is equal to the applied force of 10 N, and the distance is 6 m. Therefore, the work of the force of friction is 10 N x 6 m = 60 J.

Conversion of following angles are given in degrees and fractions of degrees and rewrite them in degrees, arcminutes, and arcseconds: a) 24 degrees, 18' and 0" b) 1 degree, 35' and 24" c) 6' and 0" d) 0' and 36" e) 0' and 2.16".

In physics, force is a physical quantity that describes an interaction between two objects that changes or tends to change the motion of one or both objects. Force is a vector quantity, meaning that it has both magnitude and direction. Force can be described as the push or pull exerted on an object and is often represented by the symbol F. Forces can be caused by a variety of physical interactions, such as friction, tension, gravity, electromagnetic forces, and so on.

Here,

a) 24.3 degrees = 24 degrees, 18' and 0"

b) 1.59 degrees = 1 degree, 35' and 24"

c) 0.1 degrees = 6' and 0"

d) 0.01 degrees = 0' and 36"

e) 0.001 degrees = 0' and 2.16"

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Tension in the horizontal drawbar is 13.4 N and the acceleration of the rig is 0.00067 m/s².

In physics, tension is the pulling force transmitted axially by the means of a string or a rope.

The tension T in the horizontal drawbar is given by the equation:

T = (m_truck * a + m_trailer * a) / 2, where m_truck and m_trailer are the masses of the truck and trailer, respectively, and a is their acceleration.

F_net = F_tractive - F_friction = m_total * a, where m_total is the total mass of the rig (m_truck + m_trailer).

m_total = 30 kg

a = F_tractive / m_total = 20 kN / 30 kg = 0.00067 m/s²

T = (10 kg * 0.00067 m/s² + 20 kg * 0.00067 m/s²) / 2 = 13.4 kg * m/s² = 13.4 N

So, the tension in the horizontal drawbar is 13.4 N and the acceleration of the rig is 0.00067 m/s².

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Newton's Second Law of Motion states that the net force acting on an object is directly proportional to its acceleration. The proportionality constant, which is the object's mass, gives the equation ma = f (force equals mass times acceleration). This means that if a force is applied to an object with a certain mass, it will accelerate proportionally to the magnitude of the force.

Applying Newton's Second Law of Motion allows us to determine the force required to move an object of a certain mass a certain distance. We can also use it to calculate the acceleration of an object given its mass and the force acting on it. The second law states that the acceleration of an object is proportional to the force applied to it and inversely proportional to its mass. If the mass of the object remains constant, the acceleration produced is directly proportional to the force applied.

The second law also tells us that if a net force is acting on an object, it will accelerate in the direction of that force. This law can be used to explain the motion of objects in both linear and rotational motion. For example, when a bat hits a ball, the force of the bat on the ball causes it to accelerate, and the ball moves in the direction of that force. In summary, applying Newton's Second Law of Motion is a powerful tool for understanding the motion of objects and how they respond to forces acting on them.

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Answer:

Please translate this into Spanish! Sorry I can't :(

Explanation:

Disadvantages of Friction:

Friction produces unnecessary heat leading to the wastage of energy.

The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects.

Forest fires are caused due to the friction between tree branches.

a) y(t) = te⁻³ᵗ is a possible position function.

b) General equation: y(t) = C₁e^(-2t) + C₂e^(-3t) + t(e^(-3t))(At + B).

c) Exact motion equation: y(t) = (23/5)e^(-2t) - (8/5)e^(-3t) + t(e^(-3t))(At + B), with initial conditions y(0) = 3 and v(0) = -7.

a) To show that y(t) = te⁻³ᵗ is a possible position function, we substitute it into the differential equation:

y(t) = te⁻³ᵗ

y'(t) = e⁻³ᵗ - 3te⁻³ᵗ

y''(t) = -6e⁻³ᵗ + 9te⁻³ᵗ

Substituting these expressions into the differential equation, we have:

-6e⁻³ᵗ + 9te⁻³ᵗ + 7(e⁻³ᵗ - 3te⁻³ᵗ) + 6(te⁻³ᵗ) = -6te⁻³ᵗ - e³ᵗ

Simplifying this equation, we find that both sides are equal, thus confirming that y(t) = te⁻³ᵗ is a possible position function.

b) The general equation for all possible position functions can be written as:

y(t) = C₁e^(-2t) + C₂e^(-3t) + t(e^(-3t))(At + B)

c) Given the initial conditions y(0) = 3 and y'(0) = v(0) = -7, we substitute these values into the general equation and solve for the constants:

3 = C₁ + C₂

-7 = -2C₁ - 3C₂

Solving these equations, we find C₁ = 23/5 and C₂ = -8/5.

The exact motion equation for the weight is:

y(t) = (23/5)e⁻²ᵗ - (8/5)e⁻³ᵗ + t(e⁻³ᵗ)(At + B)

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Suppose a weight of 1 kg is attached to an oscillating spring with friction constant b = 7 and stiffness constant k = 6. Suppose the external forces on the weight are: Fₑₓₜ(t) = - 6te⁻³ᵗ - e³ᵗ

y" + 7y' + 6y = - 6te⁻³ᵗ - e³ᵗ

a) Show y(t) = te⁻³ᵗ is a possible position function for this weight.

b) Find a general equation for all possible position functions.

c) Find the exact motion equation for this weight if its initial position is y(0) = 3, and its initial velocity is v(0) = y'(0) = -7.

To transport the gas from the tank to the discharge point, a duct with a convergent-divergent nozzle is typically used.

The convergent section of the nozzle gradually decreases in cross-sectional area to increase the velocity of the gas, while the divergent section gradually increases in area to decrease the velocity and increase the pressure.

To determine the duct exit Mach number and velocity in ft/s, we can use the isentropic flow equations. Given that the gas is air, we can assume that it behaves as an ideal gas and use the specific heat ratio for air, which is approximately 1.4.

Using the given initial conditions of 59 oF and 80 psia, we can find the corresponding values for temperature and pressure in absolute units, which are 519.67 R and 94.7 psia, respectively. We can then use these values and the specific heat ratio to calculate the Mach number and velocity at the exit of the duct.

Assuming standard atmospheric conditions at the discharge point, with a pressure of 14.7 psia and a temperature of 518.67 R, we find that the duct exit Mach number is approximately 1.4 and the velocity is approximately 1,133 ft/s.

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Plane mirrors are spherical mirrors with infinitely large focal distances. This statement is true

Spherical mirrors are generally constructed from glass. A spherical surface is a part cut from a hollow sphere. This curved surface of the glass has a silver coating on one side and a polished surface on the other, where the reflection of light takes place. The term “convex mirror” refers to a mirror where the reflection occurs at the convex surface, and the term “concave mirror” refers to a mirror where the reflection occurs at the concave surface. T

Plane mirrors can be considered as spherical mirrors with infinitely large focal distances. In a spherical mirror, the mirror's surface is part of a sphere. As the radius of the sphere increases, the mirror becomes flatter and approaches the shape of a plane mirror. When the radius becomes infinitely large, the mirror becomes a perfect plane mirror, and its focal distance also becomes infinitely large.

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