each resistor has a resistance of . what is the equivalent resistance of the resistive network shown?

It takes 2.07 seconds for the car to cover a distance of 50.0 meters while accelerating at a uniform rate of 4.00 m/s^2.

We can use the kinematic equation to solve for the time required to cover the distance.

Here's the kinematic equation that we'll use:

d = vi * t + 1/2 * a * t^2

where:

d = distance traveled (in meters)

vi = initial velocity (in meters per second)

a = acceleration (in meters per second squared)

t = time (in seconds)

We want to solve for t, so we'll rearrange the equation to isolate t:

d = vi * t + 1/2 * a * t^2

50.0 m = 20.0 m/s * t + 1/2 * 4.00 m/s^2 * t^2

50.0 m = 20.0 m/s * t + 2.00 m/s^2 * t^2

Now we have a quadratic equation in the form of ax^2 + bx + c = 0, where:

a = 2.00 m/s^2

b = 20.0 m/s

c = -50.0 m

We can use the quadratic formula to solve for t:

t = (-b ± sqrt(b^2 - 4ac)) / 2a

Plugging in the values for a, b, and c, we get:

t = (-20.0 ± sqrt(20.0^2 - 4(2.00)(-50.0))) / 2(2.00)

t = (-20.0 ± sqrt(400 + 400)) / 4.00

t = (-20.0 ± 28.28) / 4.00

We have two solutions because of the ± sign. However, we know that time cannot be negative, so we'll take the positive solution:

t = (-20.0 + 28.28) / 4.00

t = 2.07 seconds

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A nearsighted person has a near point of 12 cm and a far point of 40 cm With the corrective lens in place, the person's new near point will be 0.23 m or 23 cm.

1) Power of corrective lens for clear distant vision:

Near point = 12 cm

Far point = 40 cm

Lens Power = (1 ÷ 0.40) - (1 ÷ 0.12)

Lens Power = 2.5 - 8.33

Lens Power = -5.83 D

2) New near point with the corrective lens in place:

Lens Power = -5.83 Diopters

Far point = 40 cm

New near point = 1 ÷ (-5.83) + 0.40

New near point = -0.171 + 0.40

New near point = 0.23 m

So, with the corrective lens in place, the person's new near point will be 0.23 m or 23 cm.

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After the switch is closed, the top plate  of the capacitor eventually becomes positively charged

When the switch is closed, what happens to the capacitor's charge?

It initially acts like a short-circuit because when the switch is first closed, the voltage across the capacitor, which we were assured was entirely discharged, is zero volts. The capacitor will eventually operate as an open circuit because the voltage of the capacitor will eventually equal the voltage of the battery.

An electrolytic capacitor with polarity will be labelled with the word "polarity" on it. A minus sign or a color stripe that runs the length of the capacitor is commonly used to indicate the capacitor's negative. The positive lead of the capacitor is longer than the negative lead.

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The adiabatic compression of an ideal gas by a well-insulated piston occurs in a well-insulated chamber.

Adiabatic compression is a process in thermodynamics where a gas is compressed without any heat exchange with the environment. This means that the energy within the system remains constant, and the compression process increases the temperature and pressure of the gas. The temperature increase is a result of the conversion of work into internal energy.

Adiabatic compression is commonly used in internal combustion engines, where a mixture of fuel and air is compressed before ignition. This process increases the temperature and pressure of the mixture, which results in a more powerful combustion reaction.

The adiabatic compression process is described by the adiabatic equation, which relates the pressure, volume, and temperature of a gas under adiabatic conditions. This equation is used to calculate the thermodynamic properties of gases undergoing adiabatic processes.

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The correct option is (a) i.e. sunlight reaching the tilted surface passes through more of Earth's atmosphere and much of the energy is absorbed before it can heat the surface.

When a section of the Earth's surface is tilted with respect to the sun, the sunlight passing through more of the Earth's atmosphere means that more of the energy from the sunlight is absorbed by the Earth's atmosphere, reducing the amount of energy that reaches the surface. This results in less heating of the surface compared to when the surface is facing the sun directly. This means that more of the energy in the sunlight is absorbed or scattered before it reaches the surface, so that the sunlight is less concentrated and does not heat the surface as much as it would if the surface were facing the sun directly. This is why the heating of a section of the Earth's surface is changed when it is tilted with respect to the sun.

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Question - How is the heating of a section of earth's surface changed when that surface is tilted with respect to the sun, instead of facing the sun directly? Multiple choice question.

(a) Sunlight reaching the tilted surface passes through more of earth's atmosphere and much of the energy is absorbed before it can heat the surface.

(b) Sunlight reaching the tilted surface is less concentrated, so the surface is not heated as much.

(c) The same amount of sunlight reaches the surface in either case so there is no difference in heating.

(d) Nonw of the above

Integration scheme for one-dimensional heat conduction equation with second order spatial discretization can be unstable if the time step used in the scheme is too large. Specifically, the stability of the scheme depends on the value of the dimensionless Courant-Friedrichs-Lewy (CFL) number, which is given by αΔt/Δx^2, where α is the thermal diffusivity, Δt is the time step, and Δx is the grid spacing.

If CFL number is greater than a certain critical value the scheme will become numerically unstable and the solution will not converge to a physically realistic result. Therefore, when using an explicit time integration scheme for the heat conduction equation, it is important to choose a time step that satisfies the stability criterion.

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The Van Allen belt is formed when High-energy particles from the Sun get trapped in Earth's magnetic field

The Van Allen belts are fields in outer space caused by Earth's magnetism. Magnetic striping is evidence of seafloor unfurling. The inner Van Allen belt is located usually between 6000 and 12 000 km (1 - 2 Earth radii [RE]) above Earth's surface, although it formed dips much near the South Atlantic Ocean. The outer radiation belt covers altitudes of roughly 25 000 to 45 000 km (4 to 7 RE).

Space scientist James Van Allen and his team at the University of Iowa were the first to locate the radiation belts, now also mention to as "The Van Allen Belts."

So we can conclude that The Van Allen belts were first discovered in 1958

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High-energy particles from the Sun get trapped in Earth's magnetic field.

option A.

The Van Allen belts are formed due to the interaction of charged particles from the solar wind with Earth's magnetic field. High-energy particles from the Sun get trapped in Earth's magnetic field, creating two belts of charged particles that encircle the planet.

The inner belt is made up of highly energetic protons, while the outer belt consists of energetic electrons. The charged particles are trapped by the magnetic field and follow magnetic field lines that are shaped like a torus (doughnut) around the Earth. This creates the Van Allen belts, which can extend several thousand kilometers into space and protect the Earth from the harmful effects of charged particles in the solar wind.

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(A) This box glides, then slides up to 4.74 m before stopping . (B) The friction coefficient at the point of halting is 0.537. (C) The box would have slid 101.25 meters before coming to a stop if the coefficient of friction had stayed unchanged.

To solve this problem, we can use the work-energy theorem, which states that the net work done on an object is equal to its change in kinetic energy:

Net work = ΔK.E.

We can break the motion of the box into two parts: before and after the rough section. Before the rough section, the box is moving with a constant velocity, so the net work done on it is zero. After the rough section, the box slows down and comes to a stop, so the net work done on it is equal to its initial kinetic energy:

Net work = -K.E.

(A) To find how far the box slides before stopping, we need to find the distance over which the box is acted upon by the increasing frictional force. Let's call this distance x.

W (friction) = ∫₀ˣ F f(x') dx'

here,

F f(x') is frictional force at a distance x' from point P.

Since the coefficient of friction increases linearly with distance, we can express F f(x') as:

F f(x') = μ₀ + (μ f - μ₀) * (x'/x f)

here,

μ₀ is initial coefficient of friction at point P,

μ f is final coefficient of friction at distance x f = 12.5 m, and

x' ranges from 0 to x.

Reserving expression of F f(x') into the integral for W (friction):-

W (friction) = μ₀ * x + (μ f - μ₀) * (x²/2x f)

Express initial kinetic energy as:-

K.E. = (1/2) * m * v²

here,

m is mass of the box and

v is its initial velocity of 4.50 m/s.

Setting the net work equal to the change in kinetic energy:-

= μ₀ * x + (μ f - μ₀) * (x²/2x f)

= (1/2) * m * v²

= x² - 2x f * [(μ f - μ₀)/μ₀] * x - 2x f * (K.E./(μ₀ * m))  

= 0

Putting given values of μ₀, μ f, x f, m, and v:-

x = 4.74 m

Therefore, the box slides for a distance of 4.74 m before coming to a stop.

(B) To find the coefficient of friction at the stopping point, we can use the same equation we derived earlier for W (friction) and solve for μ f:-

= W (friction)

= μ₀ * x + (μ f - μ₀) * (x²/2x f)

= -K.E.

= μ f

= (2 * K.E. + μ₀ * x * (μ f - μ₀)/x f) / x²

Putting given values of K.E., μ₀, μ f, x f, and x:-

μ f = 0.537

Therefore, the coefficient of friction at the stopping point is 0.537.

(C)  If the coefficient of friction remained constant at μ₀ = 0.1000, then we can simplify the equation we derived for x by setting μ f = μ₀:

= μ₀ * x + (μ₀ - μ₀) * (x²/2x f)

= (1/2) * m * v²

Simplifying the second term:-

μ₀ * x = (1/2) * m * v²

Solving for x:-

x = (m * v²) / [2 * μ₀ * W (friction)]

here,

W (friction) is work done by friction.

To find W (friction), we can integrate the frictional force over the entire distance traveled by the box:-

= W (friction)

= ∫₀ˣ F f(x') dx'

here,

F f(x') is constant frictional force of μ₀.

Reserving this expression for W friction into the equation for x:-

x = (m * v²) / (2 * μ₀ * F f * x)

here,

F f is constant frictional force of μ₀.

Simplifying:-

x = (m * v²) / (2 * μ₀ * F f)

Putting given values of m, v, μ₀, and F f:-

x = 101.25 m

Therefore, if the coefficient of friction had remained constant at μ₀ = 0.1000, the box would have slid for a distance of 101.25 m before coming to a stop.

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When an x-ray photon interacts with an atom, it can transfer a quantity of energy to an inner-shell electron, thereby dislodging it from its atomic orbit.

This energy transfer is known as the photoelectric effect, or photoelectric absorption. In order for this energy transfer to occur, the energy of the incoming x-ray photon must be equal to or greater than the binding energy of the electron to its orbit. The binding energy is the amount of energy required to remove an electron from its orbital. When the energy of the incoming x-ray photon is greater than the binding energy, the extra energy is released in the form of kinetic energy, which can be used to eject the electron from its orbit. This kinetic energy is then transferred to the atom and is used to excite or ionize other electrons. Once the electron has been ejected, it is then free to travel through the atom, leaving behind a positively charged atom, or ion. This process of photoelectric absorption is essential for x-ray imaging and spectroscopy, as it allows for the detection of inner-shell electrons.

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The orbit of the Earth around the Sun is an elliptical, or oval-shaped, path that takes approximately 365.25 days to complete one full revolution.

The Earth's orbit is not perfectly circular, but rather slightly elongated, with the Sun located at one of the two foci of the ellipse.

During its orbit, the Earth's distance from the Sun varies, with the closest approach occurring in early January and the farthest distance occurring in early July. This variation in distance, along with the Earth's axial tilt, is responsible for the changing seasons on Earth.

The orbit of the Earth around the Sun is governed by the gravitational pull of the Sun, as well as the gravitational interactions between the Earth and other planets in the solar system. Despite the complex forces at play, the Earth's orbit remains remarkably stable over long periods of time.

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Civilian los activities are often carried out on the9.15  mhz, 2.45 ghz, or 5.8ghz radio frequencies.

The oscillation rate of an alternating electric current or voltage, or of a magnetic, electric, or electromagnetic field, or of a mechanical system in the frequency range of roughly 20 kHz to around 300 GHz, is referred to as radio frequency (RF). This is about between the upper and lower limits of audio and infrared frequencies; these are the frequencies at which energy from an oscillating current may radiate into space as radio waves. Different sources offer different upper and lower frequency limitations.

The flow of electricity

Electric currents that oscillate at radio frequencies (RF currents) have particular features not shared by direct current or lower audio frequency alternating current, such as the 50 or 60 Hz current utilized in electrical power distribution. RF currents in conductors can radiate energy into space as electromagnetic waves (radio waves). This is the fundamental principle of radio technology.

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The law of conservation of energy states that energy cannot be created or destroyed, but it can be changed from one form to another. Therefore, option c is the correct answer.

explain about law of conservation of energy ?

This law is one of the most fundamental principles of physics and states that the total amount of energy in a closed system remains constant over time, even though it may be transformed from one form to another (such as from potential to kinetic energy).

This law is based on numerous observations and experiments, and it has important implications for understanding the behavior of physical systems, including the ability to predict the outcomes of many physical processes.

The law of conservation of energy states that energy cannot be created or destroyed, but it can be changed from one form to another. Therefore, option c is the correct answer.

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At 3.7s the horizontal distance that the stuntwoman ought to have put the foam mats that would cushion her fall (in relation to where the helicopter will be when she plummets) is 55.5m.

The distance between initial position of the woman and ground, y0 = 30.0 m

The horizontal velocity, vx = 15.0 m/s

The vertical velocity, vy = 10.0 m/s    

Using the kinematic equation, we have

y-[tex]y_{0}[/tex] = [tex]v_{y}[/tex]t - (1/2)g[tex]t^{2}[/tex]

-(30.0 m) = (10.0 m/s)t-(1/2)(9.8 [tex]m/s^{2} t^{2}[/tex]

(4.9)[tex]t^{2}[/tex]-(10.0)t-30.0 = 0

Solving the above quadratic equation, we get   t = 3.7 s

Therefore, the horizontal distance is   R = (vx)(t)

R =   (15.0 m/s)(3.69 s)

R =     = 55.5 m

Hence 55.5m is the horizontal distance and the image shows the graph  of her movements for x-, y-, vx-, and vy-time.

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The complete question is :

An image Stuntwoman descends from a helicopter that is 30.0 metres above the ground and travelling at a steady speed of 10.0 metres per second up and 15.0 metres per second down, all in the direction of the south. Neglect air resistance. (A) Where should the stuntwoman have set the foam mats to cushion her fall (in relation to where the helicopter will be when she drops)? (B) Create graphs of her movements for x-, y-, vx-, and vy-time.

The bullet will hit the ground approximately 164.25 meters away from the base of the building.

Assuming no air resistance, we can use the equations of motion to solve this problem.

First, we need to find the time it takes for the bullet to hit the ground. We can use the equation:

h = 1/2 * g * t^2

where h is the height of the building, g is the acceleration due to gravity (approximately 9.81 m/s²), and t is the time taken for the bullet to hit the ground.

Plugging in the values, we get:

30 = 1/2 * 9.81 * t²

Solving for t, we get:

t = √(30 / (1/2 * 9.81)) = 2.19 seconds

Now that we know the time, we can find the horizontal distance traveled by the bullet using the equation:

d = v * t

where d is the horizontal distance, v is the initial velocity of the bullet, and t is the time taken for the bullet to hit the ground.

Plugging in the values, we get:

d = 75 * 2.19 = 164.25 meters

Therefore, the bullet will hit the ground approximately 164.25 meters away from the base of the building.

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By measuring the height of the waveform in the time domain or the magnitude of the frequency components in the frequency domain, the amplitude (a) of the modulated waveform may be calculated.

A lower frequency message signal modulates a high-frequency carrier wave in amplitude modulation (AM), creating a modulated waveform. The carrier frequency (fc), the modulating frequency (fm), the modulation index (m), and the amplitude (a) may all be recognised in the frequency domain representation of an AM waveform (a).

The frequency in the middle of the band that the modulated waveform occupies is known as the carrier frequency (fc). Usually, this is the frequency domain representation's highest frequency component.

Finding the frequency difference between the sidebands of the modulated waveform will reveal the modulating frequency (fm). Namely, the modulating frequency is the product of the carrier frequency and the frequency, divided by two.

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The power density is [tex]79.8 mW/m_2[/tex] if a 13 db gain antenna is used in place of the isotropic antenna.

The power density at a certain distance from an isotropic antenna is

= [tex]4 mW/m^2[/tex].

If this isotropic antenna is replaced with an antenna with 13 dB gain, then the power density at the same distance can be calculated as follows:

(1) Convert the gain in decibels (dB) to a linear scale:

[tex]Gain (linear scale) = 10^(^G^a^i^n^ (^d^B^)^/^1^0^)[/tex]

Reserving value of 13 dB:-

[tex]Gain (linear scale) = 10^(^1^3^/^1^0^) = 19.95[/tex]

(2) Use the following formula to calculate the power density of the antenna with gain:

Power density (with gain) = Power density (isotropic) * Gain (linear scale)

Reserving value of [tex]4 mW/m^2[/tex] and the value is:-

[tex]Power density (with gain) = 4 mW/m^2 * 19.95 = 79.8 mW/m^2[/tex]

Therefore, the power density at the same distance from an antenna with 13 dB gain is about [tex]79.8 mW/m^2[/tex].

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Answer:

θ = 60°

Explanation:

The magnitude of the vector product of two vectors is three times their scalar product. What is the angle between the two vectors? Let A and B be the two vectors, and θ be the angle between them. θ = 60°.

Answer: When there are two objects of different temps, the heat will always move from the higher temp to the lower temp. The energy will stop moving when there is equilibrium, when both objects are at the same temperatures.

The system in which the force of gravity on the ball an internal force to the system is Option B. system of the earth and the ball together.

Every object that has mass exerts a gravitational pull or force on every other mass. The strength of this pull depends on the millions of objects at play. graveness keeps the globes in route around the sun and the moon around the Earth. Hence, we define graveness as graveness is a force that attracts a body towards the centre of the earth or any other physical body having mass.

Originally, the direct instigation of the" ball earth" system is zero. So, according to the conservation of direct instigation, final direct instigation of the system must also be zero. therefore, if the ball moves overhead with some haste, the earth moves in downcast direction so as to conserve the instigation. Hence, the ball and the earth moves down from each other.

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Complete question:

A child holds a ball of mass m a distance h above the ground. In which system(s) is the force of gravity on the ball an internal force to the system? The system of just the ball.

The system of the earth and the ball together.

The system of the earth, the ball, and the child's hand.

The system of the earth, the ball, and the entire child.

The equivalent capacitance of the three capacitors connected in series is approximately 1.74 micro-farads.

When capacitors are connected in series, their equivalent capacitance is given by:

1/C_eq = 1/C_1 + 1/C_2 + 1/C_3 + ...

where C_1, C_2, C_3, ... are the capacitances of the individual capacitors.

In this case, the three capacitors are connected in series, so we have:

1/C_eq = 1/5.0μF + 1/4.0μF + 1/8.0μF

To find the equivalent capacitance, we need to calculate the reciprocal of the sum of the reciprocals of the individual capacitances:

1/C_eq = (8 + 10 + 5)/40 μF

1/C_eq = 23/40 μF

C_eq = 40/23 μF

C_eq ≈ 1.74 μF

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When a person is standing on a scale, the magnitude of what force is displayed by the scale, The correct option is (d) The normal force of the scale acting on the person.

When a person stands on a scale, the scale displays the magnitude of the normal force that it exerts on the person. This force is known as the "normal force" because it is perpendicular to the surface of the scale and opposes the force of gravity pulling the person down. In this case, the normal force is equal in magnitude to the weight of the person, which is the force of gravity acting on their mass.

In this scenario, the person is not accelerating (since they are standing still), so the net force on them is zero. The normal force of the scale acting on the person balances the force of gravity pulling them down, so the net force is zero. Therefore, the force displayed on the scale is the normal force, which is equal in magnitude to the weight of the person.

Option (a) is incorrect because the acceleration of the person is not relevant in this scenario, as they are not accelerating.

Option (b) is also incorrect because it suggests that the force displayed on the scale is the force of the scale acting on the person minus some other force, which is not accurate.

Option (c) is partially correct in that it refers to the person's weight, but it does not explicitly state that the scale is displaying the normal force acting on the person.

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The result of flipping the axes of the original data and performing the same procedure again will be a linear model of the form y = mx + b, where y is the predicted distance, x is the observed velocity, m is the slope, and b is the intercept. So, the answer is y(x).

When we create a predictive model for the velocity of a galaxy based on the observed distance, we have a linear model of the form v = a*d + b, where v is the predicted velocity, d is the observed distance, and a and b are the slope and intercept, respectively. To fit this linear model through least squares, we minimize the sum of squared residuals between the observed and predicted velocities. Now, if we want to create a predictive model of the distance based on the observed velocity, we need to flip the axes of the original data and perform the same procedure again. That is, we now have a linear model of the form  [tex]d = m*v + b[/tex], where d is the predicted distance, v is the observed velocity, and m and b are the slope and intercept, respectively. To fit this linear model through least squares, we minimize the sum of squared residuals between the observed and predicted distances. Thus, the result of flipping the axes of the original data and performing the same procedure again is a linear model that predicts the distance based on the observed velocity, rather than the velocity based on the observed distance.

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The acceleration due to gravity on this planet would be 6.69 m[tex]s^{-2}[/tex]. This can be calculated using the equation: g = G * (M[tex]r^{-2}[/tex]).

Acceleration is the rate at which an object's velocity changes over time. It is a vector quantity, which means it has a magnitude (or size) as well as a direction. It is usually expressed in m[tex]s^{-2}[/tex].

Steps for Calculating the Acceleration Due to Gravity on a Different Planet

Step 1: Identify the mass and radius of the planet.

Step 2: Calculate the acceleration due to gravity on the surface of that planet using the equation- g= GM/[tex]R^{2}[/tex], where G is the universal gravitational constant (6.67 x [tex]10^{-11}[/tex] [tex]m^{3}[/tex] [tex]kg^{-1}[/tex][tex]s^{-2}[/tex]), M is the mass of the planet (9.8 x [tex]10^{26}[/tex] kg), and r is the radius of the planet (2.8 x [tex]10^{7}[/tex] m).

g= (6.67408 * [tex]10^{-11}[/tex] N[tex]m^{2}[/tex] [tex]kg^{-2}[/tex]) * (9.8 * [tex]10^{26}[/tex] kg)/ (2.8 * [tex]10^{7}[/tex] m) = 6.69m[tex]s^{-2}[/tex].

The acceleration due to gravity will be in meters per second per second.

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Answer:  a new and dynamic data portal that provides an overview of the key design and implementation aspects of economic inclusion programs globally.

Explanation:

plato

The system's natural frequency is 100rad/s.

The system's driving frequency is 10rad/s.

The natural frequency (ωn) of a system is the frequency at which the system will vibrate when the damping of the system is negligible and the system is disturbed from its equilibrium.The natural frequency of the system is given by the following equation:

[tex]\omega n[/tex] =[tex]\frac{2\pi}{T}[/tex]

where T is the period of oscillation.Hence, the system's inherent frequency is

[tex]\omega n = \frac{2\pi}{0.02\pi} \\= 100 rad/s[/tex]

The driving frequency (ωd) is the frequency at which an external force must be applied to the system in order to cause it to vibrate at the natural frequency of the system. The driving frequency of the system is given by the following equation:

[tex]\omega d = \frac{2\pi}{b}[/tex]

where Tb is the beat period. Therefore, the driving frequency of the system is

[tex]\omega d = \frac{2\pi}{0.2\pi} \\= 10 rad/s[/tex]

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The energy of the sun originally came from the gravitational collapse of a nebula.

A nebula is a massive cloud of gas and dust known. When it gravitationally collapses, it causes the materials within it to heat up and, eventually, form a protostar. This protostar will continue to heat up and increase in pressure until nuclear fusion began in its core. This fusion of hydrogen atoms into helium releases a tremendous amount of energy, which is what powers the sun and gives it its heat and light.

So, the answer is the energy of the sun originally come from the collapse of a nebula.

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The final velocity of the two cars after they stick together is half the initial velocity of car a. In other words, their speed after the collision is half the initial speed of car a.

In an inelastic collision, the two objects stick together after the collision and move together with a common final velocity. In this case, the rolling railroad car a collides inelastically with railroad car b of the same mass, which is initially at rest.

Let's assume that the initial velocity of car a is v and the mass of each car is m. Since car b is initially at rest, its initial velocity is 0.

Using the law of conservation of momentum, we can write:

(momentum before collision) = (momentum after collision)

mv + 0 = (m + m)vf

where vf is the final velocity of the two cars after they stick together.

Simplifying the equation, we get:

vf = v/2

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Therefore, the maximum elevation the rocket reaches is approximately 1322.9 meters.

define elevation ?

Elevation refers to the vertical distance or height of a location or object above a reference point, such as sea level or ground level. It is often used in geography, surveying, and navigation to describe the height or altitude of a place or feature relative to its surroundings.

The maximum elevation the rocket reaches can be found by first calculating its velocity at the instant the motor turns off and then using the kinematic equation for displacement:

vf = vi + at

where vf is the final velocity, vi is the initial velocity (which is 0 m/s since the rocket starts from rest), a is the acceleration (20 m/s^2), and t is the time interval during which the acceleration is applied (4 s).

vf = 0 + 20 m/s^2 * 4 s = 80 m/s

Now, we can use the kinematic equation for displacement:

Δy = viΔt + 1/2at^2

where Δy is the displacement (or change in elevation), vi is the initial velocity, a is the acceleration (which is now the acceleration due to gravity, -9.8 m/s^2), and t is the time interval during which the object moves (which is the time from when the motor turns off until the object reaches its maximum elevation).

We know that the initial velocity is 80 m/s and that the displacement we are looking for is the maximum elevation. We can solve for t by setting vf to 0 and solving for t:

0 = 80 m/s + (-9.8 m/s^2) * t

t = 8.16 s

Now we can use this value of t to find the maximum elevation:

Δy = viΔt + 1/2at^2

Δy = (80 m/s)(8.16 s) + 1/2(-9.8 m/s^2)(8.16 s)^2

Δy = 1322.9 m

Therefore, the maximum elevation the rocket reaches is approximately 1322.9 meters.

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The scale will read 290.6 N when the piece of copper is submerged in water.

The Force exerted by the mass of the copper piece is 320 N according the scale reading, We know that Weight = mg where m is the mass of the object and g is the acceleration due to gravity (9.8 m/s²). Therefore the mass of the copper piece is :

⇒Weight = mg

⇒m = Weight/g

⇒m = 320/9.8

⇒32.65 kg

Now , we know that density = mass/volume. The density of copper is 8830 kgm⁻³.

∴ Volume = mass/density

⇒ 32.65/8830

⇒ 0.003 m³

Now, Apparent weight = (Weight of the object) - (Weight of the volume of liquid displaced by the object)

Formula for buoyant force = (volume displaced) x (acceleration due to gravity) x (density of the liquid). Density of water is approximately 1000kg/m³

Therefore, Apparent weight of the copper piece :

⇒ Actual weight - Buoyant force

⇒ 320N - [1000 x 0.003 x 9.8]

⇒ 320N - 29.40N

⇒ 290.6 N

Therefore, the scale will read 290.6 N when the copper piece is submerged in water.

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The work done on the box by the static friction force as the accelerating truck moves a distance D to the left is negative.

The sum of the force applied to the body and the displacement of the body in the direction of that force is the work performed. A force performs positive work when the body is moved in the direction of the force applied, whereas a force performs negative work when the body is moved in the direction that is opposed to the force.

When the body's displacement in the direction of the force is zero, no work is done.

When the body is moved in the direction of the force, frictional force will provide positive work. An illustration will help you to understand this. Imagine two blocks are piled one on top of the other. There is a frictional force between the two blocks that prevents the two blocks from sliding if the bottom block begins to move slowly in one direction. This force pushes against the top block in the direction that the lower block is moving. Along with the bottom block, the higher block also travels in the direction of the frictional force. Friction therefore produces negative work in this situation.

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