Plutonium-239 has a half-life of approximately 24,000 years.
show that it will take about 190,000 years for the
amount of plutonium-239 in a sample to decrease to 1/256 of its
present amount.

Answer:

because the electricity always looking for a way to get to the ground

\( \huge \mathfrak \red{AnSwer}\)

Birds can sit on power lines and not get electric shocks because the electricity is always looking for a way to get to the ground. The birds are not touching the ground or anything in contact with the ground, so the electricity will stay in the power line.

Answer:

600000 kg m/s

Explanation:

mass of a truck(m)=2000kg

velocity of truck(v)=300m/s

momentum(P)=mv

=2000×300

=600000kg m/s

When a photon interacts with a nucleus or an electron, it can be absorbed by the atom, and its energy is transferred to the atom's electron(s),

Ejected from the atom, or it can undergo pair production. In pair production, the energy of the photon is converted into the rest mass of an electron-positron pair.The minimum energy required for pair production is 2m_ec^2 = 1.022 MeV, where m_e is the mass of the electron and c is the speed of light.In this case, the photon has an energy of 3.64 MeV, which is greater than the minimum energy required for pair production. Therefore, the photon can produce an electron-positron pair.The total energy of the electron-positron pair will be equal to the energy of the photon, which is 3.64 MeV. This energy will be divided between the electron and the positron in some proportion, depending on the specifics of the pair production event.

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Answer:

I think B but I could be wrong

Explanation:

The absolute value of the exhausted heat (Qc) each second in MJ for the power plant is 2741 MJ.

e) the amount of energy Qh in MJ is 3.53 x 10⁸ MJ

f) the coal would the plant need to operate for a day is 14120 tons.

g) tons of this coal is exhausted as wasted 9460.

Over a single cycle, there will be no change in the internal energy. As a result, the amount of work completed in a single cycle is equal to the heat exchanged. So, by figuring out the effort that was done, we can find the heat that was expended.

W = Pt = (1350 x 10⁶)(1) = 1350 x 10⁶ J

Q = (W/0.33) - W

= W(1/0.33 - 1)

= 2741 x 10⁶ = 2741 MJ

e) W = (1350 x 10⁶) (86400) = 1.1664 x 10¹⁴

Q = (1.1664 x 10¹⁴)/0.33

Q = 3.53 x 10⁸ MJ

f) n = \(\frac{Q_h}{Q}\)

= 3.53 x 10¹⁴/25 x 10⁹ = 14120 tons.

g) n = 0.67\(\frac{Q_h}{Q}\)

= 0.67(\(n_g\))

= 0.67(14120)

n = 9460.

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Explanation:

it requires energy

hope it helps

Answer:

Is this a true and false statement?

Explanation:

Your operational definitions describe the variables you will use as indicators and the procedures you will use to observe or measure them. You need an operational definition because you can't measure anything without one, no matter how good your conceptual definition might be.

"Creative and methodical activity undertaken to improve the reservoir of knowledge" is what research is. It entails gathering, organising, and analysing data in order to better understand a subject, and is distinguished by a specific focus on identifying and eliminating sources of bias and inaccuracy.

An operational definition, also known as a construct definition, is intended to replicate or depict a concept or theoretical definition. In order for other researchers to be able to duplicate their findings, scientists should provide sufficient detail in their descriptions of the operations (procedures, activities, or processes) that define the notion.

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Answer:

Electron affinity is the energy change that results from adding an electron to a gaseous atom. For example, when a fluorine atom in the gaseous state gains an electron to form F⁻(g), the associated energy change is -328 kJ/mol.

Give brainliest please.

Answer:

Electron affinity is the energy change that results from adding an electron to a gaseous atom.

Sorry I don't know about the second one.

Answer:

Parallel

Explanation:

The work done is defined as the force applied on an object and the displacement in the position of the object in the direction of force.

W = F s cos A

where, F is the force, s is the displacement and A is the angle between force and displacement.

When the angle between the force and the displacement is 90 degree, the work done is zero.

To get the maximum work the angle between the force and the displacement is 0 degree.

So, to get the work done by the force the angle between the force and displacement is 0 degree that means the force and displacement is parallel to each other.

During tornadoes

If a source of sound is traveling toward you, the speed of the sound waves reaching you is higher than the speed the sound waves would have had if the source were stationary.

The speed of sound waves in a medium is determined by the properties of the medium itself, such as its density and elasticity. In general, sound waves travel at a specific speed in a given medium, regardless of the motion of the source.

However, when the source of sound is in motion, there is an additional component to consider: the relative motion between the source and the observer. This relative motion affects the perceived frequency of the sound waves, known as the Doppler effect.

If the source of sound is moving towards the observer, the sound waves get compressed, resulting in a higher frequency and shorter wavelength. As a result, the speed of the sound waves relative to the observer appears higher than it would be if the source were stationary.

It's important to note that the actual speed of sound in the medium remains constant. It is the perceived speed or apparent speed of the sound waves reaching the observer that is affected by the motion of the source.

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The critical speed below which the rope would become slack when the bucket reaches the highest point in the circle is determined by the length of the rope and the radius of the circle.

When the bucket is at the highest point in the circle, it is momentarily at rest and the tension in the rope must be zero.

The formula for calculating the critical speed at which the rope becomes slack is:

v = √(gr)

where v is the critical speed, g is the acceleration due to gravity, and r is the radius of the circle.

For example, if the radius of the circle is 2 meters and the acceleration due to gravity is 9.8 m/s², the critical speed would be:

v = √(9.8 × 2) = 4.4 m/s

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Answer:

The mass of the ball is 1.64 kg.

Explanation:

You have to apply Newton's second law, F = m×a where F represents force, m is mass and a is acceleration :

\(F = m \times a\)

\(let \: F = 12.6,a = 7.7\)

\(12.6 = m \times 7.7\)

\(12.6 \div 7.7 = m\)

\(m = 1.64kg \: (3sf)\)

According to Wien's Law, if the surface temperature is increased by a factor of 2, the peak wavelength of the radiation emitted by the surface will decrease.

Wien's Law states that the peak wavelength of radiation emitted by an object is inversely proportional to its temperature.

Mathematically, the law can be expressed as λ_max = (b / T), where λ_max represents the peak wavelength, b is Wien's constant (approximately 2.898 × 10^(-3) m·K), and T is the temperature in Kelvin.

When the surface temperature is increased by a factor of 2, it means that the temperature is doubled. Using Wien's Law, we can observe that the peak wavelength will be halved. This is because an increase in temperature results in the emission of shorter wavelengths of light. As the temperature increases, the peak of the emitted radiation shifts towards the shorter wavelength region of the electromagnetic spectrum.

In summary, if the surface temperature is increased by a factor of 2, the peak wavelength of the radiation emitted by the surface will decrease, implying a shift towards shorter wavelengths.

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The maximum kinetic energy an object can have before the cord breaks in uniform circular motion can be determined by calculating the tension in the cord when the object is moving at its maximum speed.

Using the given radius of the circular path and the maximum tension limit, we can calculate the maximum kinetic energy of the object.

In uniform circular motion, the centripetal force required to keep an object moving in a circular path is provided by the tension in the cord. The centripetal force is given by the equation F = m * v^2 / r, where F is the force, m is the mass of the object, v is the velocity, and r is the radius of the circular path.

To find the maximum kinetic energy, we need to determine the maximum tension in the cord when the object is moving at its maximum speed. This occurs when the centripetal force is equal to the maximum tension allowed by the cord, which is 17.0 N in this case.

Using the centripetal force equation and rearranging for v^2, we have v^2 = F * r / m. Substituting the given values, we can solve for the maximum velocity of the object. The maximum kinetic energy is then calculated using the equation KE = (1/2) * m * v^2.

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The change in the internal energy of a system is equal to the difference in energy transferred to or from the system as heat and work done.

Work done is the energy needed or supplied to perform any task.

The first law of thermodynamics gives the relation between the heat and work done.

The heat added to a system is divide into two. One portion adds up heat to increase the internal energy and the left heat is used to do work.

ΔQ = ΔU + W

ΔU = ΔQ -W

Thus, the first law of thermodynamics states that the change in the internal energy of a system is equal to the difference in energy transferred to or from the system as heat and work done.

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As you descend into a lake from just below the surface to 10 feet under the surface, the net pressure force on your body increases while your weight stays the same. This is because the deeper you go, the more water there is above you, creating more weight and pressure.

The net pressure force on your body is the difference between the pressure on your skin from the water pushing down and the pressure inside your body pushing out. The deeper you go, the greater the pressure from the water pushing down on your body. However, your weight stays the same because the water you displace (the water you push out of the way as you descend) weighs the same as your body.

Therefore, the correct answer is that the net pressure force on your body increases and your weight stays the same as you descend from just below the surface to 10 feet under the surface. It's important to note that this increase in pressure can have physiological effects on your body, such as changes in heart rate and breathing, which is why it's important to take precautions when diving or spending extended periods of time underwater.

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Answer:

im pretty sure about C

Explanation:

a switch acts a resistor that can be turned on and off

Also it's the same for Automotive purposes

The speed of the rock is 56.8 m/s.

Wavelength, λ = 2.03 x 10⁻³⁴m

Mass of the rock, m = 115 x 10⁻³kg

So, the kinetic energy,

1/2 mv² = hc/λ

v = √(2hc/mλ)

v = √(2 x 6.63 x 10⁻³⁴/115 x 10⁻³x2.03 x 10⁻³⁴)

v = 56.8 m/s

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Answer:

Work done= Energy transferred

Explanation:

Work is the transfer of energy. In physics we say that work is done on an object when you transfer energy to that object. If you put energy into an object, then you do work on that object (mass).

Answer:

v_y = v_{oy} - g t

where the upward direction is positive, so the arrow represents this speed (blue) must decrease, reach zero and grow in a negative direction as time progresses

Explanation:

In this exercise you are asked to observe the change in velocity in a projectile launch.

If we assume that the friction force is small, the velocity in the x-axis must be constant

         vₓ = v₀ₓ

Therefore, the arrow (red) that represents this movement must not change in magnitude.

In the direction of the y axis, the acceleration of gravity is acting, so the magnitude of the velocity in this axis changes

         v_y = v_{oy} - g t

where the upward direction is positive, so the arrow represents this speed (blue) must decrease, reach zero and grow in a negative direction as time progresses

Answer:

The charge of a neutron is 0  

The charge of an electron is -1

Explanation:

Answer:

The charge of Neutrons is: 0

The charge of Electrons is: -1

Explanation:

Neutrons are uncharged and Electrons are negatively charged. The negative charge of one electron balances the positive charge of one proton. Both protons and neutrons have a mass of 1, while electrons have almost no mass.

Answer:

watts !

Explanation:

the answer is b. blah blah blah filling out space

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

m is the mass

v is the velocity

From the question we have

\(k = \frac{1}{2} \times 0.046 \times {15.5}^{2} \\ = 0.023 \times 240.25 \\ = 5.52575\)

We have the final answer as

Hope this helps you

Compared with a simple galvanometer, an electric motor is Much the same with small modifications.

An electric motor is a device for converting electrical energy into mechanical energy. A tool that functions the other way around, converting mechanical energy into electrical energy is called a generator or dynamo. Electric motors can be found in household appliances such as fans, washing machines, water pumps, vacuum cleaners. and much more.

Electric motors that are commonly used in the world Industry are asynchronous electric motors, with two global standards namely IEC and NEMA. metric (millimeter) based IEC asynchronous motors, while imperial  (inch) based NEMA electric motors, in applications there are power units in horsepower (hp) and kiloWatt (kW).

IEC electric motors are divided into several classes according to their efficiency, as a standard in the EU, this class division is EFF1, EFF2 and EFF3. EFF1 is the most efficient electric motor, consumes the least amount of energy, while EFF3 is no longer allowed to be used in the EU environment, because it wastes fuel in the power plant and will automatically generate the most carbon emissions, thus polluting the environment even more.

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Hello!

To find the volume with a known mass and known density:

 ⇒ must consider the relationship between all three of the variables:

      \(\hookrightarrow \text{Mass = volume * density}\)

Let's write down all that we know:

Let's plug these into our equation:

  \(\text{Mass = volume * density}\\39\text{g} = \text{volume } *3\text{g/ml}\\\\ \text{volume} = \dfrac{39\text{g}}{3\text{g/ml}} \\\\\text{volume}=13\text{ml}\)

Answer: 13 ml

Hope that helps!

the work done to raise a 25kg book to a 1.5 m shelf is 367.5J and the potential energy of the book will be 367.5

Work done by a force is equal to the scalar product of the force applied and displacement. If d displacement happens on applying a force F, then work done, W by the force is

W = F. d

given:

mass, m = 25 kg

height, d = 1.50 m

work has to be done against the weight of the book, F = mg

work done W = F. d

W = mgd

W = (25) ×(9.8)×(1.50)

W = 367.5 J

This work is stored as the potential energy of the book.

Therefore, the work done to raise a 25kg book to a 1.5 m shelf is 367.5J and the potential energy of the book will be 367.5J

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The value of fg would be 244.7 N if the object was brought to a planet with 3 times the radius of the earth.

What is gravity?

All matter is attracted to one another by gravity, which is also known as a gravitational force in mechanics. It is by far the weakest known force in nature and has little bearing on how ordinary matter behaves within.

The structure and growth of stars, galaxies, and the entire cosmos are all under its influence, as are the orbits of some things. The weight of the Earth operates on all objects on Earth, giving them a weight or gravitational pull that is proportionate to their mass.

The acceleration that gravity gives a falling item is how it is measured. The acceleration of gravity is roughly 9.8 metres (32 feet) per second at the surface of the Earth. Her body is falling at a faster rate the longer it is in free fall.

Her body is falling free at a rate of around 9.8 metres per second. A free-falling object on the moon accelerates at a rate of about 1.6 metres per second.

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