De acordo com a sequência de substâncias listada na tabela ao lado, se atritarmos vidro com lã, o vidro ficará carregado positivamente. Qual será a carga da madeira quando atritada com: a) lã b) seda c) marfim

because the ocean releases heat more slowly than land, coastal areas tend to be more temperate. Upwelling in many coastal regions provides a cool contrast in air temperature over the ocean and land that is conducive to frequent summer fog.

The given wavelength is between 400 nm to 700 nm, so the maximum frequency of visible light is 7.5 x 10¹⁴ Hz.

The length between corresponding spots of two successive waves is known as the wavelength. Two points or particles that are in the same phase and have finished the same portions of their periodic motion are referred to as "corresponding points."

In transverse waves, the length is frequently measured from peak to peak or from trough to trough, and in longitudinal waves, from compression to compression.

Now, let's find out the frequency,

f = c/v

f = (3 x 10⁸)/(400 x 10⁻⁹)

f  = 7.5 x 10¹⁴

Therefore, the highest frequency is 7.5 x 10¹⁴ Hz.

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Answer:

has f uped hands

Explanation:

The phase difference between the two points is

Δϕ = (2π/λ) * l

The phase difference (Δϕ) between two points in a wave can be calculated using the formula

Δϕ = (2π/λ) * Δx

Where

Δϕ is the phase difference in radians.

λ is the wavelength of the wave.

Δx is the distance between the two points.

In this case, the distance between the two points in space is given as l, and the wavelength of the wave is λ.

Therefore, the phase difference between the two points is

Δϕ = (2π/λ) * l

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Answer:

8.06 m/s

Explanation:

It is given that,

Mass of a swimmer, m = 72 kg

He jumps from a diving board 3.25 m above the water.

We need to find the speed just as he hits the water if he jumps straight up. Using the conservation of energy to fin it as follows :

\(mgh=\dfrac{1}{2}mv^2\\\\v=\sqrt{2gh} \\\\v=\sqrt{2\times 10\times 3.25}\\\\ v=8.06\ m/s\)

So, the required speed is 8.06 m/s.

To answer the questions posed in Figure 21, we need to apply the principles of electric circuits and the properties of the devices used to measure current and voltage.

Figure 21 shows a circuit diagram with a 12 V battery connected to a resistor. To answer the questions posed, we need to consider the properties of the components in the circuit.
a. The ammeter is a device that measures the current flowing in the circuit, which is the flow of electric charge. The ammeter reading would depend on the resistance of the resistor, which is not provided in the question. However, assuming that the resistor has a resistance of 10 ohms, the ammeter reading would be 1.2 A (using Ohm's Law, I = V/R).
b. The voltmeter is a device that measures the potential difference between two points in the circuit. In this case, the voltmeter reading would be 12 V since the battery provides a constant voltage.
c. Power is the rate at which energy is transferred or transformed. The power delivered to the resistor can be calculated using the formula P = VI (where V is the voltage and I is the current). Using the values from part (a), the power delivered to the resistor would be 14.4 W (P = 12 V x 1.2 A).
d. Energy is the ability to do work. The energy delivered to the resistor per hour is the power delivered multiplied by the time in hours. Using the values from part (c) and assuming a time of 1 hour, the energy delivered to the resistor would be 14.4 Wh.

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The conservation laws we can find the complete reaction of Uranium-235 and the correct answer is:

               \(^{235}_{92}U + ^1_0n\)  → \(^{236}_{92} U*\)

               \(^{236}_{92}U*\)  →  \(2 \ ^{116}_{46} \ Pd + 2 \ ^1_0n + 195 \ MeV\)

Nuclear fission occurs when a heavy nucleus is divided into two smaller nuclei, for the process to occur requires the absorption of some particle or some form of energy that creates an unstable heavy nucleus this nucleus passes to a lower energy configuration when be divided.

In the case of Uranium 235 this occurs when a neutron is absorbed, according to the reaction

                    \(^{235}_{92} U + ^1_0n\) →  \(^{236}_{92} U*\)

Where uranium 235 and 236 of atomic mass, * indicates that the nucleus is unstable and decays after about 10⁻¹² s

Indicate that one of the daughter nuclei is palladium, which is why a partial reaction remains

                  ^{236}_{92} U* → \(^{116}_{46}Pd\) + Y + \(^1_0n\)

Where Y is the other daughter nucleus and n the neutrons released in the reaction

The conservation laws must be fulfilled, let's use:  the conservation of atomic number and mass

.

1) The conservation of the atomic number allows to find the number of protons (atomic number) to atoms Y

                #_protons = 92- 46

                #_protons = 46 protons

The other atom is also a Palladium atom, the reaction is

           ^{236}_{92} U* → \(2 \ ^{116}_{46}Pd\)  + \(^1_0n\)

2) Conservation of mass we can find the number of neutrons emitted in the reaction

The mass of the palladium atoms is

                   m_ {children} = 2  116.9178 u

                   m_ {children} = 233.8256 u

The mass difference between the uranium and the daughter nuclei is

                   Δm = m_ u - m_ {daughters}

                   Δm = 236.0455561 - 233.8256

                   Δm = 2.2199561 u

The mass of a neutron tabulated is m_n = 1.000866492 u

Consequently there is only mass for two neutrons that must be emitted in the process, the mass of the two neutrons is

                  m_ {total neutron} = 2.001732984 u

The amount of mass remaining is converted into energy

                   ΔE = m c²

The remaining mass to be convert to energy is

                 m_{remaining} = 2.2199561 - 2.001732984 = 0.2103626 u

                  m = 0.2102626 u (1.66054 10⁻²⁷ kg / 1u) = 0.3491495 10⁻²⁷ kg

                  ΔE = 0.3491495 10⁻²⁷ (2.99 10⁸) ²

                  ΔE = 3.1214 10⁻¹¹ J

It is more common to give this energy in eV

                 ΔE = 3.1214 10⁻¹¹ J ( \(\frac{1 eV}{1.6 \ 10^{-19} J}\) ) = 1.9509 10⁸ eV

We summarize the complete reaction is

               \(^{235}_{92}U + ^1_0n\)  → \(^{236}_{92} U*\)

               \(^{236}_{92}U*\)  →  \(2 \ ^{116}_{46} \ Pd + 2 \ ^1_0n + 195 \ MeV\)

We can see that this reaction is not very efficient since a neutron is needed to start it and only two neutrons are emitted at the end of the process, even when the amount of energy emitted is high 195 MeV

In conclusion Using the conservation laws we can shorten the complete reaction of Uranium giving that the correct answer is:

                  \(^{235}_{92}U + ^1_0n\)  → \(^{236}_{92} U*\)

               \(^{236}_{92}U*\)  →  \(2 \ ^{116}_{46} \ Pd + 2 \ ^1_0n + 195 \ MeV\)

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Given,

The work done by the engine, W=23 kJ

The time it takes for the engine to do the given amount of the work, t=1800 s

The power is the time rate of change of transfer of energy or the energy transferred in unit time. Thus the power supplied by the engine can be calculated as the ratio of the work done to the time.

Thus the power supplied by the engine is given by,

On substituting the known values,

Thus the power supplied by the engine is 12.78 W.

A simple circuit has a 20 Ω resistor and carries 0. 3 A. The voltage of the power source is 6 V.  In a simple circuit with only one resistor, the voltage across the resistor is equal to the voltage of the power source.

Using Ohm's law, we can determine the voltage of the power source by multiplying the resistance (R) of the circuit by the current (I) flowing through it. Thus, we have:

V = IR

Substituting the given values, we get:

\(V = (0.3 A)(20\; \Omega) = 6 V\)

Therefore, the voltage of the power source in the circuit is 6 volts. In a simple circuit with only one resistor, the voltage across the resistor is equal to the voltage of the power source.

This is because the sum of the voltages across all the components in the circuit must equal the total voltage of the power source, due to the conservation of energy.

It's important to note that in real-world circuits, the voltage of the power source can fluctuate due to various factors such as fluctuations in the electrical grid or changes in the internal resistance of the power source itself.

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The first mistake individuals made was to believe that Earth was the center of everything, as the Catholic Church believed. Galileo's idea about Earth revolving arount the Sun was heretical and enough to me condemned.

The second mistake individuals made was to believe that all the physical things was comanded by God only, denying the possibility of having formal science to study the physical world.

Answer:

I would say D

Explanation:

because the amount of energy in molecules of matter determines the state of matter

(if I'm wrong I'm sorry)

The momentum before the collision velocity after the collision will be 1237.6 kg m/s² and 6.8 m/sec.

According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.

The given data in the problem is;

(m₁) is the mass of hockey player 1= 91.0-kg

(m₂) is the mass of hockey player 2=  91.0-kg

(u₁) is the velocity before collision of hockey player 1 = 5.50 m/s.

(u₂) is the velocity before the collision of hockey player 2=?

a)

Momentum before the collision;

\(\rm m_1u_1 + m_2u_2 \\\\ 91.0 \times 5.50 + 91.0 \times 8.1 \\\\ 1237.6 kg m/s^2\)

Momentum before the collision = 1237.6 kg m/s².

b)

The velocity of the two hockey players after the collision from the law of conservation of the momentum as:

Momentum before collision = Momentum after the collision

1237.6 kg m/s² = (m₁+m₂)V

1237.6 kg m/s² =(2 ×91.0-kg )V

V=6.8 m/sec.

Hence, momentum before the collision velocity after the collision will be 1237.6 kg m/s² and 6.8 m/sec.

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Answer:

v = 1.63 m/s

Explanation:

Given that,

The mass of a car, m = 1500 kg

The kinetic energy of a car, K = 2004 m/s

We need to find the speed of a car. The formula for the speed of a car is given by :

\(K=\dfrac{1}{2}mv^2\\\\v=\sqrt{\dfrac{2K}{m}} \\\\v=\sqrt{\dfrac{2\times 2004}{1500}} \\\\v=1.63\ m/s\)

So, the speed of the car is equal to 1.63 m/s.

Answer:taking my points !

Explanation:

When the car is stopped by the bumpers, the maximum deflection in each spring can be determined by analyzing the forces acting on the car. Since the car is freely coasting, its kinetic energy is converted into potential energy stored in the springs.

First, we calculate the initial kinetic energy of the car:

Kinetic Energy = (1/2) * mass * velocity^2

= 112,500 lb-ft

Potential Energy = (1/2) * kA * deflectionA^2 + (1/2) * kB * deflectionB^2

To determine the maximum deflection in each spring, we need to find the point where the potential energy is maximized while satisfying the condition that the car is completely stopped. By taking the derivative of the potential energy equation with respect to each deflection and setting them equal to zero, we can solve for the maximum deflections. However, since the equations involve second-order terms, a detailed calculation is required to find the precise values.

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Answer:heating it

Explanation:

Answer:

Heating it

Explanation:

i took the k12 test and got a A

Answer:

V = 0.01(R₁ + R₂)

Explanation:

From Ohm's law, the voltage V across a resistor with resistance R and a current I passing through it is given by

V = IR

If we have two resistances, R₁ and R₂ in series, the total resistance R is the sum of their resistances.

So, R = R₁ + R₂

Now, if the current in the circuit is 0.01 A, the voltage V is

V = IR

V = 0.01R

Substituting R = R₁ + R₂ into the equation for V, we have

V = 0.01(R₁ + R₂)

So, the voltage in two series resistors with current 0.01 A is

V = 0.01(R₁ + R₂)

The ocean conveyor belt is a global system of deep and surface ocean currents that circulate water around the world. It is driven by differences in water density, temperatures, and salinity.

Salinity is the measure of the amount of dissolved salts in a given volume of water. It is typically expressed as parts per thousand (ppt) or parts per million (ppm). Salinity can be found in most bodies of water, including oceans, rivers, and lakes. Salinity levels can vary greatly depending on the source of the water, the amount of rainfall, and other factors. In general, the higher the salinity, the more difficult it is for organisms to survive in the water. High salinity levels can also affect the taste and smell of the water, and can be an indicator of water pollution. Salinity can also be an important factor for many human activities, such as agriculture, industry, and navigation.

The ocean conveyor belt has a huge effect on coastal climates by transporting heat from the tropics to higher latitudes, where it is released into the atmosphere. This helps warm coastal climates, resulting in milder winters and cooler summers. It also helps to reduce the effects of extreme weather events such as droughts and floods, by moderating temperatures and redistributing moisture.

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To calculate the mean atomic mass, μ and He when X = 0.70, Y = 0.30, Z = 0.00, the following steps should be taken. The first step is to calculate the average atomic mass of the element.

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Answer:

A) only the wall is involved for both forces (action-reaction)

When formulating a theory on galaxy creation and evolution, there are two key components. One is knowledge of the rate of star creation within galaxies.

Astronomers calculated that there are between 100 and 200 billion galaxies in the universe by multiplying this figure by the number of times this tiny area of sky would fit further into entire sky.

The greatest galaxies can contain up over one hundred trillion stars, whereas the tiniest galaxies only contain a "mere" few hundred million stars. Spiral, elliptical, unusual, and irregular galaxies can be divided into four categories by scientists.

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Fnet <F1+ F₂ because the net force will include the component of frictional force. Option C.

Forces are balanced when people on both sides of the rope are pulling the same amount in opposite directions. As a result, there is no motion. Balanced forces can cancel each other out. If the forces are balanced, the object will not move. When two forces act in the same direction, they add. Equal forces acting in opposite directions are called equilibrium forces.

Equilibrium forces acting on an object do not change the object's motion. Adding equal forces in opposite directions results in a net force of zero. Balanced forces acting on the same object, but in opposite directions. The net force due to these forces is zero. The sum of the magnitudes of the forces is also equal to the sum of the two forces acting in the same direction.

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The magnification is doubled when 10x oculars are used instead of 5x in our microscope with the same objectives.

When multiple lenses are lined together, the overall magnification can be calculated by multiplying the individual magnifications of each lens.

M = M1 × M2 × M3 × ... × Mn

where M is the overall magnification and M1, M2, M3, ..., Mn are the magnifications of the individual lenses.

Let M be the magnification of the objective, then the overall magnification,

when 5x ocular is used,

M1 = M × 5

M1 = 5M

when 10x ocular is used

M2 =  M × 10

M2 = 10M

Therefore, the magnification is doubled when 10x ocular is used instead of 5x in our microscope with the same objectives.

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The ciliary body is a wedge-shaped thickening in the middle layer of the eyeball that controls the shape of the lens.

The ciliary body is a section of the middle layer of the eye's wall. It is located behind the iris.  It includes a ring-shaped muscle that modifies the curvature of the lens when the eye focuses.

Additionally, it creates the transparent liquid that fills the area between the iris and the cornea. Aqueous humor is the name of this fluid in the eye.

It also contains the ciliary muscle, which modifies the lens' shape when your eyes focus on a close object.

The anterior pars plicata and the posterior pars plana are two parts of ciliary body. The anterior vitreous comes into contact with the pars plana, which creates a smooth surface. The ciliary processes, which are 70–80 radiating ridges, are produced by the pars plicata.

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Answer:

b

Explanation:

the location where an earthquake begin is called

There  are approximately 2.01 x 10^18 photons of light with a wavelength of 4000 Å in 1 J of energy.

To determine the number of photons of light having a wavelength of 4000 Å, we can use the formula:

E = h * c / λ

where E is the energy of a photon, h is Planck's constant, c is the speed of light, and λ is the wavelength of the light.

First, we need to convert the wavelength from angstroms (Å) to meters (m):

4000 Å = 4000 × 10^-10 m

Plugging in the values for h, c, and λ, we get:

E = (6.626 x 10^-34 J s) * (2.998 x 10^8 m/s) / (4000 x 10^-10 m) = 4.97 x 10^-19 J

The energy of a photon is also related to its frequency (ν) by the equation:

E = h * ν

where ν is the frequency of the light. We can rearrange this equation to solve for the frequency:

ν = E / h

Plugging in the energy value we just calculated, we get:

ν = 4.97 x 10^-19 J / 6.626 x 10^-34 J s = 7.50 x 10^14 Hz

Now, we can use the formula for the energy of a photon to calculate the number of photons in a given amount of energy. If we have a total energy of E_total, the number of photons (N) is given by:

N = E_total / E

Let's assume that we have 1 J of energy. Then, the number of photons with a wavelength of 4000 Å would be:

N = 1 J / 4.97 x 10^-19 J = 2.01 x 10^18 photons

Therefore, there are approximately 2.01 x 10^18 photons of light with a wavelength of 4000 Å in 1 J of energy.

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In a pulsed Neodymium-YAG laser with a wavelength of 1062 nm and a pulse duration of 31 picoseconds, there are approximately 3.05 wavelengths contained within the laser pulse. This calculation is based on dividing the pulse duration by the wavelength.

To determine the number of wavelengths within the laser pulse, we divide the pulse duration by the wavelength. In this case, the pulse duration is given as 31 picoseconds (31 x 10^-12 seconds) and the wavelength is 1062 nm (1062 x 10^-9 meters).

First, we need to convert the pulse duration to seconds by multiplying it by 10^-12. This gives us 31 x 10^-12 seconds.

Next, we divide the pulse duration by the wavelength.

(31 x 10^-12 seconds) / (1062 x 10^-9 meters) = 2.917 x 10^-11 wavelengths

Rounding to two decimal places, we find that there are approximately 3.05 wavelengths within the laser pulse.

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The angular speed of the wheel is **100π** radians per minute.

The linear speed of a rotating wheel is the distance traveled by a point on the circumference of the wheel per unit time. In this case, the linear speed is given as 200f(t)/(m)in, where f(t) represents an arbitrary function of time and m represents an arbitrary unit of measurement.

To find the angular speed of the wheel, we need to convert the linear speed into angular speed. Angular speed is defined as the rate at which an object rotates or travels around a circular path. It is measured in radians per unit time.

To convert the linear speed into angular speed, we need to relate the linear speed to the circumference and radius of the wheel. The circumference of a circle is given by 2π times the radius. In this case, the radius of the wheel is given as 2 feet.

Since the linear speed is the distance traveled per unit time, we can calculate the distance traveled in one minute by multiplying the linear speed by 60. Dividing this distance by the circumference of the wheel gives us the number of revolutions per minute. To convert this into radians per minute, we multiply the number of revolutions by 2π.

In summary, to calculate the angular speed of the wheel, we take the given linear speed and convert it into the number of revolutions per minute. We then multiply this value by 2π to obtain the angular speed in radians per minute.

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Answer:

If the bicycle went down the hill, because if you are at the top of the hill, that is potential energy, when you start going down, it is turned into kinetic energy. Makes sense?

Explanation: