How long does it take to shut down a nuclear reactor?.

Answer:

0.495 Ω.

Explanation:

To solve this problem, we will use the formula for heat:

Q = mcΔT

Where Q is the heat transferred, m is the mass of the liquid, c is the specific heat capacity of the liquid, and ΔT is the change in temperature.

Since the calorimeter has a total heat capacity of 950 J/K, we can write:

Q = 950ΔT

where ΔT is the temperature change of the calorimeter.

The heat generated by the coil can be calculated using the formula:

Q = I²Rt

where I is the current, R is the resistance of the coil, and t is the time the current is passed.

Substituting the given values, we get:

Q = (4A)²R(5min*60s/min) = 960Rs

where Rs is the heat generated per unit resistance.

Since the heat generated by the coil is transferred to the calorimeter, we can equate the two expressions for Q:

960Rs = 950ΔT

Solving for R, we get:

R = (950ΔT) / (960s)

Substituting the given values, we get:

R = (950J/K * (29°C - 9°C)) / (960s * 4²)

R = 0.495 Ω

Therefore, the resistance of the coil is 0.495 Ω.

Answer: the resistance of the coil is 300 ohms.

Explanation:

We can use the formula for heat generated by a resistor to find the power generated by the coil:

P = I^2 * R

where P is power, I is current, and R is resistance.

The power generated by the coil will be equal to the heat absorbed by the liquid in the calorimeter:

P = Q/t

where Q is the heat absorbed, and t is the time.

We can use the formula for heat absorbed by a substance to find the heat absorbed by the liquid:

Q = C * m * ΔT

where Q is the heat absorbed, C is the specific heat capacity of the liquid, m is the mass of the liquid, and ΔT is the change in temperature.

We are given the total heat capacity of the calorimeter, which is equal to the sum of the heat capacities of the liquid and the calorimeter:

C_total = C_liquid + C_calorimeter

We can rearrange this equation to solve for the specific heat capacity of the liquid:

C_liquid = C_total - C_calorimeter

Plugging in the given values, we get:

C_liquid = 950 J/K - unknown

We need to find the unknown value of C_calorimeter in order to solve for the specific heat capacity of the liquid. We can do this by using the formula for heat absorbed:

Q = C_total * ΔT

where Q is the heat absorbed by the calorimeter and the liquid, and ΔT is the change in temperature of the calorimeter and the liquid.

Plugging in the given values, we get:

Q = 950 J/K * (29°C - 9°C) = 19000 J

The power generated by the coil is:

P = I^2 * R = 4^2 * R = 16R

The heat absorbed by the liquid is:

Q = P * t = 16R * 300 s = 4800R J

Setting these two equations equal to each other, we get:

16R = 4800R

Dividing both sides by 16, we get:

R = 300 ohms

Therefore, the resistance of the coil is 300 ohms.

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Answer:

Sir Isaac Newton was an English mathematician, physicist, astronomer, theologian, and author

Explanation:

but he is most importantly known for having formulated the theory of universal gravity

and for having invented the calculus in the mid to late 1660s

Answer:

Dry lubricants or solid lubricants are materials that, despite being in the solid phase, are able to reduce friction between two surfaces sliding against each other without the need for a liquid oil medium.

Explanation:

Answer:

Your answer is graphite :) Have a nice day

Explanation:

Even with infinitely powerful telescopes, we can look back in time only until the Cosmic Microwave Background (CMB), around 380,000 years after the Big Bang.

The Cosmic Microwave Background is the earliest observable stage of the universe's history. Before the CMB, the universe was in a hot, dense state known as the "opaque plasma" where photons were constantly scattered by charged particles, making it impossible to see through.

Approximately 380,000 years after the Big Bang, the universe cooled down enough for atoms to form, allowing photons to travel freely. This event is called "recombination," and the released photons created the CMB. Even with infinitely powerful telescopes, we cannot observe anything prior to the CMB because light did not travel freely in the opaque plasma.

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The given statement is true

Inertia is the tendency of an object to stay at rest or in motion

Answer:

45km/hr

Explanation:

Total distance=450km

Total speed=50km/hr

Total time= distance/speed

=450/50

=9hrs

distance a=180km

speed a=60km/hr

Time a=180/60

=3hrs

Distance b=450-180=270km

Speed b=?

Time b=270/speed b

Total time=time a + time b

9=3+(270/speed b)

270/speed b =9-3

270/speed b =6

6*speed b =270

Speed b=270/6

Speed b=45km/hr

Answer:

45km/hr

Explanation:

Total distance=450km

Total speed=50km/hr

Total time= distance/speed

=450/50

=9hrs

distance a=180km

speed a=60km/hr

Time a=180/60

=3hrs

Distance b=450-180=270km

Speed b=?

Time b=270/speed b

Total time=time a + time b

9=3+(270/speed b)

270/speed b =9-3

270/speed b =6

6*speed b =270

Speed b=270/6

Speed b=45km/hr

Answer:

Part A

1) At the starting point, we have;

PE = 40,000 J

2) PE = 0 J, KE = 40,000 J

3) KE = 20,000 J

4) PE = 15,000 J

5) KE = 32,500 J

6) KE = 40,000 J, PE = 0 J

7) KE = 35,000 J

8) KE = 40,000 J, PE = 0 J

Part B

The total Mechanical Energy = ME = 40,000 J

At the final point, we have;

ME = KE + PE = 40,000 J + 0 J = 40,000 J

Explanation:

Part A

By the law of conservation of energy, we have;

ME = PE + KE

Where;

ME = The total Mechanical Energy of the system

PE = The Potential Energy of the system

KE = The Kinetic Energy of the system

Where there is no friction, we have;

At the final stage, KE = 40,000 J. PE = 0 J

Therefore, ME = PE + KE = 40,000 J + 0 J = 40,000 J

1) At the starting point, we have;

KE = 0 J, therefore, PE = ME - KE = 40,000 J - 0 J = 40,000 J

2) At the bottom of the roller coaster, at the same level the PE is taken as PE = 0 J at the final stage, we have;

PE = 0 J, therefore, KE = ME - PE = 40,000 J - 0 J = 40,000 J

3) Where PE = 20,000 J, KE = ME - PE = 40,000 J - 20,000 J = 20,000 J

4) Where KE = 25,000 J, PE = ME - KE = 40,000 J - 25,000 J = 15,000 J

5) Where PE = 7,500 J, KE = ME - PE = 40,000 J - 7,500 J = 32,500 J

6) At the bottom KE = 40,000 J, PE = 0 J

7) Where PE = 5,000 J, KE = ME - PE = 40,000 J - 5,000 J = 35,000 J

8) KE = 40,000 J, PE = 0 J

Part B

The given that there is no friction nor air resistance, the total Mechanical Energy, ME, is constant and equal to the sum of the Potential Energy, PE and the Kinetic Energy, KE, as follows;

ME = KE + PE

At the final point, we have;

ME = 40,000 J + 0 J = 40,000 J

The total Mechanical Energy = ME = 40,000 J

Answer:

We have the position vector given in terms of time t. r(t) = t^3*i + t^2*j

To find the velocity vector we have to differentiate r(t) with respect to time.

r'(t) = 3t^2*i + 2t*j

The vector representing acceleration is the derivative of the position vector

r''(t) = 6t*i + 2*j

When time t = 2.

The velocity vector is 3*2^2*i + 2*2*j

=> 12*i + 4*j

The speed is the absolute value of the velocity vector or sqrt(12^2 + 4^2) = sqrt (144 + 16) = sqrt 160

The acceleration vector is 6*2*i + 2*j

=> 12*i + 2*j

The required acceleration at t=2 is 12*i + 2*j and the speed is sqrt 160.

Explanation:

Can I have thx and brainliest?

The electronic transition responsible for the Pfund series of the hydrogen spectrum, with its longest wavelength component at 7400 nm, involves an electron moving from an excited state to the fifth energy level (n = 5) in the hydrogen atom.

The Pfund series is a set of spectral lines in the hydrogen spectrum that corresponds to electronic transitions where the electron jumps from higher energy levels to the fifth energy level (n = 5). The longest wavelength component of this series occurs when the electron transitions from the excited state (n > 5) to the fifth energy level.

In the hydrogen atom, electrons occupy discrete energy levels around the nucleus. When an electron gains energy, it moves to a higher energy level. The transition that produces the Pfund series involves an electron moving from an excited state (n > 5) to the fifth energy level (n = 5). As the electron undergoes this transition, it releases energy in the form of electromagnetic radiation. The longest wavelength component in the Pfund series corresponds to the transition with the least energy difference, resulting in a longer wavelength.

Understanding the electronic transitions in the hydrogen spectrum helps us study the behavior of atoms and provides valuable insights into quantum mechanics and the structure of matter.

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Answer:

A. kilometers

Explanation:

Answer:

plane

Explanation:

A harmonic is a wave or signal whose frequency is an integral (whole number) multiple of the frequency of the same reference signal or wave

To determine the fundamental frequency (1st harmonic) and the next 3 harmonics of a closed-end air column with a length of 67.5 cm, follow these steps:

1. Convert the length to meters: 67.5 cm = 0.675 m

2. For a closed-end air column, the fundamental frequency (1st harmonic) is given by the formula:

f1 = v / 4L

where f1 is the fundamental frequency, v is the speed of sound in air (340 m/s), and L is the length of the column (0.675 m).

3. Plug the values into the formula:

f1 = 340 / (4 * 0.675) = 340 / 2.7 ≈ 125.93 Hz

The fundamental frequency (1st harmonic) is approximately 125.93 Hz.

4. For closed-end air columns, only odd harmonics are present. The next 3 harmonics will be the 3rd, 5th, and 7th harmonics. The formula for finding the nth harmonic frequency is:

fn = n * f1

where fn is the nth harmonic frequency and n is the harmonic number (3, 5, or 7).

5. Calculate the next 3 harmonics:

3rd harmonic (n=3): f3 = 3 * 125.93 ≈ 377.79 Hz
5th harmonic (n=5): f5 = 5 * 125.93 ≈ 629.65 Hz
7th harmonic (n=7): f7 = 7 * 125.93 ≈ 881.51 Hz

In summary, the fundamental frequency (1st harmonic) of the closed-end air column is approximately 125.93 Hz, and the next 3 harmonics are approximately 377.79 Hz (3rd ), 629.65 Hz (5th harmonic), and 881.51 Hz (7th harmonic).

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When communicating with Apollo astronauts, scientists on earth use radio waves and the "over to you" method of communication. This method must be used because of the delay in communication. This delay is due to the: distance of the moon and the speed of the electromagnetic waves

The oscillations between an electric field and a magnetic field produce electromagnetic waves, often known as EM waves. In other words, magnetic and electric fields oscillate to form electromagnetic waves. Since the electric and magnetic fields are oscillating, the energy waves are known as electromagnetic (EM) waves. They are categorized by scientists according to their frequency or wavelength, moving from high frequency to low frequency (short to long wavelength).

A magnetic core may make an electromagnetic coil's magnetic field several hundred times stronger than it would be without one. However, there are drawbacks to magnetic cores that need to be considered.

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Answer: A mixture

Explanation:

A mixture is where 2 or more substances are physically combined, and where you can know what each substance is

Answer: Mixture

Mixture is made up of two or more different substances, which are mixed but not combined chemically.

Explanation:

Hope this helps =)

Rounding to two significant figures, the smallest possible uncertainty in the electron's energy is 2.2×10−17 J.

ΔE · Δt ≥ ħ/2,

where ΔE is the uncertainty in the energy, Δt is the time interval of the measurement, and ħ is the reduced Planck constant.

Substituting the given values into the equation, we have:

ΔE · (1.5×\(10^{-8\) s) ≥ ħ/2

ΔE ≥ ħ/(2 · 1.5×\(10^{-8\) s)

ΔE ≥ (6.626×\(10^{-34\) J·s)/(2 · 1.5×\(10^{-8\) s)

ΔE ≥ 2.2×\(10^{-17\) J

Uncertainty refers to a lack of knowledge or information about a particular situation, event, or outcome. It is the feeling of not being sure or confident about what will happen in the future. Uncertainty can arise from a variety of factors, such as incomplete or conflicting data, ambiguous circumstances, or unpredictable events.

In many cases, uncertainty can create anxiety or stress, as individuals may feel powerless or out of control in uncertain situations. However, uncertainty can also be an opportunity for growth and learning, as it can inspire curiosity and encourage individuals to explore new possibilities. Uncertainty is a common feature of many aspects of life, including business, politics, relationships, and personal development.

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Answer:

i actually giggled at that oml.

Explanation:

that was good

Answer:

The building are not getting farther and farther away, road signs, exits, other cars

Explanation:

The net force on the block parallel to the incline is

∑ F = -mg sin(θ) = ma

where m is the mass of the block, g = 9.8 m/s² is the acceleration due to gravity, θ is the angle the incline makes with the horizontal, and a is the acceleration of the block. Solving for a gives

a = -g sin(θ)

so the block would slide down the incline with acceleration

a = - (9.8 m/s²) sin(30°) = -4.9 m/s²

The plane was flying at 39.6 m/s when the bottle was released .

\(h = ut + 1/2at^2\)

distance fallen h= 500m

Initial velocity u=0

a=98 m/s2

\(h = 1/2at^2\)

\(t^2 = 2h/a\)

\(t^2 = 1000/9.8 = 10.1s\)

\(d_h = 400, t = 10.1s\)

\(v = d_h/t\\v = 400/10.1\)

v = 39.6 m/s

Altitude or Height  (also known as depth) is a measurement of the distance between a reference point and a point or object, usually in a vertical or "upward" direction. The exact definition and reference value varies depending on the context (eg, aeronautics, geometry, geodesy, sports, or barometric pressure). Although the term height is often used to refer to the height of a place above sea level, in geography the term height is often preferred for this use.

The vertical measurement of distance in the "down" direction is usually called depth.

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Answer:

19,540 N

Explanation:

if you have a force at an angle in order to get it with the horizontal you get the Force times cosine the angle and if you want it with the vertical you got the Force times sine the angle

Small stars have a longer and less dramatic life cycle than large stars. They gradually expand and cool as they run out of fuel, eventually becoming white dwarfs. Large stars, on the other hand, go through a more explosive and shorter life cycle, culminating in a supernova that can create neutron stars or black holes.

Small and large stars have different life cycles because they have different masses, which affects their gravitational forces and the fusion processes that occur in their cores.

Here's a comparison of their life cycles:

Small Stars:

Protostar: A cloud of gas and dust collapses under its own gravity, forming a dense, hot core.

Main Sequence: Nuclear fusion of hydrogen in the core produces energy, which counteracts the force of gravity and keeps the star stable. This phase can last for billions of years.

Large Stars:

Protostar: A cloud of gas and dust collapses under its own gravity, forming a dense, hot core.

Main Sequence: Nuclear fusion of hydrogen in the core produces energy, which counteracts the force of gravity and keeps the star stable. This phase can last for millions of years.

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Answer: Total distance = 4π meters and the Total Displacement = 0

Explanation: 1.5 rounds around the pole = 1.5 times the circumference of the circle form by the rope.

Circumference of a Circle = 2πr

from the question the radius = 2m, hence the total circumference = 2π*2 = 4π meters.

Displacement which is distance between initial position and final position. When the horse takes one and a half rounds around the pole, it ends up back at the starting point. Hence, the displacement is zero.

Light bulb could be plugged into a socket in Europe, would be true about how bright the bulb was (c). The bulb would be one-half as bright is the correct option.

The brightness of a light bulb is measured in terms of its power consumption, which is given in watts (W). When the voltage is constant, the power consumed by a device is directly proportional to its brightness. In the United States, a standard 60 W light bulb operates at 120 V. To determine the current consumed by the bulb, we can use Ohm's law:

Power = Voltage x Current

60 W = 120 V x Current

Current = 60 W / 120 V = 0.5 A

Now, if we were to plug this same 60 W light bulb into a socket in Europe with a standard voltage of 240 V, we can use Ohm's law again to determine the current consumed by the bulb:

Power = Voltage x Current

60 W = 240 V x Current

Current = 60 W / 240 V = 0.25 A

The power consumed by the bulb is the same, regardless of the voltage it is connected to. But the current consumed by the bulb in Europe is half of what it would be in the United States.

The bulb would be one-half as bright when plugged into a socket in Europe compared to when it is plugged into a socket in the United States.

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The measure of central tendency that should be used to calculate the cutoff time for the final race is the median.

Option C.

The median is the middle point in a dataset—half of the data points are smaller than the median and half of the data points are larger.

To find the median: Arrange the data points from smallest to largest. If the number of data points is odd, the median is the middle data point in the list.

So from the given data of the 100 meter dash, the measure of central tendency that should be used to calculate the cutoff time for the final race is the median.

The median will help to separate half of the data points that are smaller than the cutoff time and half of the data points are larger than the cutoff time.

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Answer:

drinking enough fluids, wearing proper clothing and timing your workout to avoid extreme heat

Answer:

Average speed = 1.3 m/s

Explanation:

Given that a student walks 160 m in 150 s. The student stops for 30 s and then walka 210 m farther in 140 s.

Neglect the time the student stops.

The total distance covered will be

Distance = 160 + 210

Distance = 370 m

The total time of the whole distance journey will be

Time = 150 + 140 = 290 s

The formula for speed is

Speed = distance/time

Speed = 370/290

Speed = 1.276 m/s

Therefore, the average speed is 1.3 m/s approximately

Answer:

The anomalous expansion of water is an abnormal property of water whereby it expands instead of contracting when the temperature goes from 4o C to 0o C, and it becomes less dense.

Explanation:

The density is maximum at 4 degree centigrade and decreases below that temperature as shown in graph.