The satellite that has given us the most precise measurements of the characteristics of the cosmic background radiation is:

An excited electron with the lowest energy is the second circle away from the nucleus (green dot) labeled n = 2.

In Chemistry, an electron is considered to be in an excited state when it temporarily occupies an energy state that is greater than its ground state. Also, an electron becomes excited when it gains extra energy by:

Based on the diagram shown in the image attached below, an excited electron with the lowest energy is the second circle away from the nucleus (green dot) labeled n = 2.

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Using Runge-Kutta 2nd order Heun's method, the speed (w) at t = 0.8s is approximately 0.0081.

Given:

Voltage input (V) = 30V

Initial speed (w) = 0

Step size (h) = 0.4s

Time at which speed is to be determined (t) = 0.8s

We need to determine the speed (w) at t = 0.8s using Heun's method.

We have k₁ = f(t₁, W₁) = 0.02 + 0.06w₁ (using the given equation)

At t = 0 and w = 0 (initial conditions), we have:

k₁ = 0.02 + 0.06(0) = 0.02

We have k₂ = f(t₁ + h, w₁ + k₁h) = 0.02 + 0.06(w₁ + 0.02h)

So, at t = 0.4s and w = 0 (initial conditions), we have:

k₂ = 0.02 + 0.06(0.02 * 0.4) = 0.02 + 0.00048 = 0.02048

So, W₂ = w₁ + (k₁ + k₂)(h/2)

   = 0 + (0.02 + 0.02048)(0.4/2)

   = 0.04048(0.2)

   = 0.008096

Therefore, using Runge-Kutta 2nd order Heun's method, the speed (w) at t = 0.8s is approximately 0.0081.

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The complete question is:

The speed of a motor supplied with a voltage input of 30V, assuming the system is without damping, can be expressed as 30 = (0.02)+(0.06)w dt If the initial speed is zero and a step size of h = 0.4 s, determine the speed w at t = 0.8 s by using the Runge-Kutta 2nd order Heun's method. Heun's method: Wi+1=W₁ = w₁ + (-/-^₁ + = -K ₂ ) h where, k₁ = f(t₁, W₁) and k₂ = f(t₁ + h, w₁ + k₁h), the speed (w) at t = 0.8s is approximately 0.0081.

The subsequent current in the series RLC circuit is given by the equation: i(t) = I * cos(5t - Φ), where I is the amplitude of the current and Φ is the phase angle.

To find the subsequent current, we need to calculate the amplitude (I) and the phase angle (Φ) of the current.

First, let's calculate the resonant frequency (ω) of the circuit:

ω = 1 / √(LC) = 1 / √(10 * 10^(-2)) = 1 / √1 = 1 rad/s.

The applied voltage can be written as E(t) = E * cos(ωt), where E is the amplitude of the voltage.

Comparing this with the given voltage E(t) = 200 * cos(5t), we can equate the angular frequencies: ω = 5.

Now, let's find the impedance (Z) of the circuit:

Z = √(R^2 + (Xl - Xc)^2),

where R is the resistance, Xl is the inductive reactance, and Xc is the capacitive reactance.

R = 20 Ω

Xl = ωL = 1 * 10 = 10 Ω

Xc = 1 / (ωC) = 1 / (5 * 10^(-2)) = 20 Ω

Plugging in these values, we get:

Z = √(20^2 + (10 - 20)^2) = √(400 + 100) = √500 ≈ 22.36 Ω.

The amplitude of the current (I) can be calculated using Ohm's Law:

I = E / Z = 200 / 22.36 ≈ 8.94 A.

The phase angle (Φ) can be found using the relationship between resistance, inductive reactance, and capacitive reactance:

tan(Φ) = (Xl - Xc) / R = (10 - 20) / 20 = -0.5.

Therefore, Φ ≈ -0.464 rad.

The subsequent current in the series RLC circuit is given by i(t) = 8.94 * cos(5t + 0.464) A.

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80Sec or 1.33 min time taken by train to cross a bridge with a uniform speed of 36 kmph.

Given data,

length of bridge = 600m

length of train = 200m

Length of bridge + Length of train is the total distance travelled by train to cross the bridge.

So, 600+200 = 800m = 0.8km

Now, applying the formula for time,

\(time =\frac{distance}{speed}\)

\(time = \frac{0.8}{36}\)

time = 0.022hours

time in seconds= 0.022×60×60

time in seconds= 1.33×60

time in seconds= 80seconds

Therefore, 80Sec or 1.33 min time taken by train to cross a bridge with a uniform speed of 36 kmph.

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Answer:

If an object is electrically neutral it has no net charge becuase it has the same number of protons as it does electrons, which are opposite charges that offset each other. No, that just means that the sum of all its positive and negative amounts of charge equals zero.

Answer:

D)Sound Energy/magnetic energy

Explanation:

Got it right on Apex!

Answer:

Magnetic and Electromagnetic Energy

Explanation:

F

Complete Question:

A student has been assigned to measure the density of an irregularly shaped piece of metal.

Which apparatus would be most appropriate to carry out this task?

Group of answer choices

A. ruler, balance

B. beaker, crucible

C. flask, Bunsen burner

D. graduated cylinder, balance

Answer:

D. graduated cylinder, balance

Explanation:

In this scenario, A student has been assigned to measure the density of an irregularly shaped piece of metal.

The apparatus which would be most appropriate to carry out this task is a graduated cylinder and balance.

A graduated cylinder can be defined as a measuring cylinder used for the measurement of the volume of an irregularly shaped piece of metal or liquids. It is typically marked with horizontal lines on its side as units of measurement for volume. The balance is then used to weigh the metals mass.

The Carnot heat engine absorbs 8.3 J of heat per cycle from the high-temperature reservoir.

The efficiency of a Carnot heat engine is given by the equation:

Efficiency = 1 - (Tc/Th)

where Tc is the temperature of the cold reservoir and Th is the temperature of the hot reservoir.

In this case, the temperatures are given as 500°C and 30°C, respectively. We can calculate the efficiency of the engine using these values:

Efficiency = 1 - (30 + 273.15)/(500 + 273.15) ≈ 0.8208

The efficiency of a Carnot heat engine is also defined as the ratio of the work done by the engine to the heat absorbed from the high-temperature reservoir:

Efficiency = Work/Heat absorbed from high-temperature reservoir

We know that the engine does 2.2 J of work per cycle, so we can rearrange the equation to solve for the heat absorbed from the high-temperature reservoir:

Heat absorbed from high-temperature reservoir = Work/Efficiency

Heat absorbed from high-temperature reservoir = 2.2 J / 0.8208 ≈ 2.68 J

Therefore, the Carnot heat engine absorbs approximately 2.68 J of heat per cycle from the high-temperature reservoir.

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The CD's average rotational acceleration is 20 rpm/s. In this case, the final angular velocity is 300 rpm, the initial angular velocity is 100 rpm, and the time is 10 seconds.

To find the CD's average rotational acceleration, we use the formula: average rotational acceleration = (change in angular velocity) / (change in time). In this case, the change in angular velocity is 300 rpm - 100 rpm = 200 rpm, and the change in time is 10 seconds. Dividing the change in angular velocity by the change in time gives us 200 rpm / 10 s = 20 rpm/s. Therefore, the CD's average rotational acceleration is 20 rpm/s. This means that, on average, the CD's rotational velocity increases by 20 revolutions per minute every second.

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The statement that is said to be the a valid conclusion based on the results of this experiment is that: option c; Cattails grow the fastest when they receive maximal volumes of water

Cattails is known to be a plant that is said  to possess “wet feet” in almost all of the growing season.

Note that when a person want to control the plant cattails, you will be required to distort the root system via the use of cutting, hand-pulling, dredging, flooding, and others.

Hence, The statement that is said to be the a valid conclusion based on the results of this experiment is that: option c; Cattails grow the fastest when they receive maximal volumes of water

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See full question below

Which of the following statements is a valid conclusion based on the results of this experiment?

a. Cattails grow the fastest when they receive minimal volumes of water

d. All plants grow fastest when they receive maximal volumes of water

b. Cattails grow the fastest when they receive intermediate volumes of water

e. Both c and d

c. Cattails grow the fastest when they receive maximal volumes of water

Answer:

11025 N / m²

Explanation:

Los siguientes datos se obtuvieron de la pregunta:

Área (A) = 400 cm²

Masa (m) = 45 Kg

Aceleración por gravedad (g) = 9,8 m / s²

Presión (P) =?

A continuación, determinaremos la fuerza aplicada. Esto se puede obtener de la siguiente manera:

Masa (m) = 45 Kg

Aceleración por gravedad (g) = 9,8 m / s²

Fuerza (F) =.?

F = m × g

F = 45 × 9,8

F = 441 N

A continuación, convertiremos 400 cm² a m². Esto se puede obtener de la siguiente manera:

1 cm² = 0,0001 m²

Por lo tanto,

400 cm² = 400 cm² × 0,0001 m² / 1 cm²

400 cm² = 0,04 m²

Por tanto, 400 cm² equivalen a 0,04 m².

Finalmente, determinaremos la presión ejercida de la siguiente manera:

Área (A) = 0.04 m².

Fuerza (F) = 441 N

Presión (P) =?

P = F / A

P = 441 / 0,04

P = 11025 N / m²

Por tanto, la presión ejercida es 11025 M / m²

Gravitational Potential Energy is the type of energy the ball has at the top of the hill.

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The measure of the chord-chord angle is 175.5.

A circle's chord is the line segment that connects any two locations on the circle's circumference. It should be remembered that a circle's diameter is defined as the lengthiest chord that runs across the center of the circle.

An angle is a figure created by two rays or lines that have the same termination in plane geometry. The Latin word "angulus," which meaning "corner," is where the term "angle" originates. The common terminal of the two rays—known as the vertex—is referred to as an angle's sides.

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Given :

Height from which ball is dropped , h = 40 m .

Acceleration due to gravity , g= 10 m/s² .

Initial velocity , u = 0 m/s .

To Find :

Velocity when ball covered 20 m and velocity when it hit the ground .

Solution :

Now , height when ball covered 20 m distance is , 40 - 20 = 20 m .

By equation of motion :

\(v^2=u^2+2gh\\\\v=\sqrt{2\times 10\times 20}\ m/s\\\\v=20\ m/s\)

Now , distance covered when body reaches ground is , 40 m .

Putting value h = 40 m in above equation , we get :

\(v=\sqrt{2\times 10\times 40}\ m/s\\\\v=20\sqrt{2}\ m/s\)

Hence , this is the required solution .

Answer:

The spring constant will be "1333.33 N/m".

Explanation:

The given values are:

Mass,

m = 1.2 kg

Displacement compression,

x = 0.15 m

Block's velocity,

\(v_i=5 \ m/s\)

As we know,

⇒  \(E_i=E_f\)

or,

⇒  \(K_i+v_i=K_f+v_f\)

⇒  \(\frac{1}{2}mv_i^2+0=0+ \frac{1}{2}Kx^2\)

So,

⇒  \(K=\frac{mv_i^2}{x_2}\)

On substituting the values, we get

⇒       \(=\frac{1.2\times 5\times 5}{0.15\times 0.15}\)

⇒       \(=\frac{30}{0.0225}\)

⇒       \(=1333.33 \ N/m\)

The approximate speed of the roller coaster is 32m/s.  

Considering that the earth and the roller coaster are both parts of one system.

We can use the law of conservation of energy,

This law states that in a system, the sum of total energy is always conserved.

So we can say that the energy at the top of roller coaster will be equal to the energy at the bottom of the roller coaster.

At top, whole energy is potential energy and the bottom whole energy is kinetic energy,

So we can write,

PE = KE

Mgh = 1/2Mv²

Where M is mass of roller coaster,

v is the speed of roller coaster,

g is acceleration due to gravity and,

h is the height of the roller coaster,

Putting all the values,

gh = 1/2v²

v² = 2gh

v² = 2×9.8×51

v² = 999.6

v = 31.61 m/s.

The speed of roller coaster at the end is 32 m/s approx.

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The box will be in rest due to net force applied on it is zero.

The definition of force in physics is: The push or pull on a massed object changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.

Given that Bert and Ernie are pushing on opposite sides of the box with force of same magnitude, let it be F.

So, net force acting om the force = F-F = 0.

As that net force acting on the box is zero, the box will be in rest.

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The term used to describe the sliding motion within the layers of an object is "shear."

Shear refers to the deformation that occurs when layers of a material slide or move in relation to each other, parallel to their planes. This type of motion can happen in various materials, including solids, fluids, and even gases.

In the context of solids, shear can occur when a force is applied parallel to a surface or when there is a difference in movement between adjacent layers.

This can lead to the layers sliding past one another, resulting in a shearing or shearing deformation. Shear can cause changes in shape, stress distribution, and material properties within the object.

Shear is an essential concept in fields such as materials science, engineering, and physics.

Understanding shear behavior is crucial for designing structures, analyzing material properties, and predicting the response of materials under different loads and conditions.

Various mathematical models and equations, such as the shear stress and shear strain relationship, are used to quantify and describe shear deformation in materials.

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Answer:

Letter C

Explanation:

That is newton's first law

Answer:

3,510 po yung sagot pa brainliest po

Explanation:

By adding the distances for cycling, running, and swimming, the total race distance can be determined. The distance covered by him is 13.5 km.

Converting all the distances to the same unit before combining them because the triathlete swims 500 meters, runs 3000 meters, and cycles 10.0 kilometers.

Divide 500 meters by 1000 to get kilometers: 500 meters divided by 1000 equals 0.5 kilometers.

Divide 3000 meters by 1000 to get 3 kilometers: 3000 meters divided by 1000.

The triathlete completes a 0.5-kilometer swim, a 3-kilometer run, and a 10.0-kilometer bike ride.

Now that the distances have been added, the total is 13.5 kilometers: 0.5 kilometers for swimming, 3 kilometers for running, and 10.0 kilometers for cycling.

Consequently, the race's overall length is 13.5 kilometers.

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The magnitude of the linear acceleration of the pack can be calculated using the following equation:a = (T - Fr) /m where a is the magnitude of the linear acceleration of the pack,T is the tension force of you on the pulley,Fr is the frictional force, and m is the mass of the pack.Substitute the given values to the formula:a = (T - Fr) / ma = (266.3 - Fr) / 23.4.

The frictional force can be determined using the moment of inertia of the pulley.I = mr²I = 2.85 kg-m²m = I / r²m = 2.85 / 0.43²m = 15.57 kgFr = maFr = 15.57 × aa = (266.3 - 15.57a) / 23.4Solve for a by multiplying both sides by 23.4:23.4a = 266.3 - 15.57a23.4a + 15.57a = 266.3a = 266.3 / 39.97a = 6.66 m/s².

Therefore, the magnitude of the linear acceleration of the pack is 6.66 m/s².If instead of using a pulley with two radii, you were to replace the two radii pulley with a simple pulley of one radius, it will be harder to hold the pack.

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Answer:

200 ms-1

Explanation:

v = u+ at

v = 50+ 5×30

v = 200 ms-1

Answer: The statement is false.

Explanation:

Although adding heat energy to a system raises its temperature, that isn't always the scenario. When you heat water, for example, the temperature rises, but when you heat it to 100 degrees Celsius, the state of the water changes while the temperature stays the same.

In order to determine the number of particles of methane, use the following expression:

number of particles = (mass /molar mass ) x Avogadro's number

in this case, you have:

molar mass = 16.03 grams/mole

mass = 120 grams

Avogadro's number = 6.02*10²³ particles/mol

replace the previos values of the parameters into the formula for the number of particles:

number of particles=(120 grams/ 16.03 grams/ mol)x(6.02*10²³particles/mol)

= (7.46 mol) x (6.02*10²³ particles/mol)

= 4.50*10²⁴ particles

Hence, the number of particles of methane, in 120 grams, is 4.50*10²⁴

The length of the aluminum flagpole will increase by 0.00881 m as the temperature increases by 15.

The length of an aluminum flagpole may not change with temperature. While thermal expansion can cause materials to change in size when heated or cooled, aluminium, as a metal, is not significantly affected by temperature changes. As such, the length of an aluminium flagpole is unlikely to be significantly affected by changes in temperature.

Calculate the Coefficient of Linear Expansion for Aluminum

The coefficient of Linear Expansion for aluminum is about 0.000023 per degree Celsius

Calculate the change in length

Change in length = (Coefficient of Linear Expansion x Original Length x Change in Temperature)

Change in length = (0.000023 x 39.4 m x 15) = 0.00881 m

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Answer:

It is recommended that you exercise within 55 to 85 percent of your maximum heart rate for at least 20 to 30 minutes to get the best results from aerobic exercise. The MHR (roughly calculated as 220 minus your age) is the upper limit of what your cardiovascular system can handle during physical activity.

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