when illuminated by red light of frequency f = 6 x 1014 hz, what is the stopping voltage of a photocell, made of a metal plate with a work function w = 2 ev?

To find the average distance of Halley's comet from the sun, we need to know the length of its orbit. Since the orbit of Halley's comet is an ellipse, we can use the semi-major axis of the orbit, which is equal to half of the average distance between the closest point (perihelion) and the farthest point (aphelion) of the orbit. Since the comet returns to aphelion every 76 years, we can assume that its orbit is 76 years. Since the orbit is an ellipse, the semi-major axis can be calculated using the equation:

Semi-major axis (a) = (Aphelion distance + Perihelion distance) / 2

We don't know the perihelion distance but we know that the aphelion distance is the distance from the Sun to the comet when it's at aphelion which is not given, so we can't calculate the semi-major axis without more information.

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Answer:

Velocidad final, V = 8 m/s

Explanation:

Dados los siguientes datos;

Velocidad inicial, u = 4 m/s

Aceleración, a = 2 m/s²

Tiempo, t = 2 segundos

Para encontrar la velocidad final (v), usaríamos la primera ecuación de movimiento;

V = u + at

Sustituyendo en la fórmula, tenemos;

V = 4 + 2*2

V = 4 + 4

Velocidad final, V = 8 m/s

White clothing keeps our bodies cool in the summer because it reflects most of the sun's heat and absorbs very little of it.

Dark color is the best retain er of intensity, so dark garments assimilate the vast majority of the intensity while white garments mirror all the light arriving at on them. This makes the white garments cooler than dark.

A white object is white because it reflects white light, which is the sum of all the colors that can be seen. This implies that a white shirt (or jeans) will mirror the vast majority of the light and not get hot.

A black object becomes warm because it converts all wavelengths of light into heat. Because a white object reflects all wavelengths of light, the light does not become heat and the object's temperature does not significantly rise.

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They are all undergoing the fusion of hydrogen into helium within their cores.

Main sequence stars are characterized by the source of their energy. They are all experiencing a combination of hydrogen into helium inside their cores. The rate at which they do this and the sum of fuel accessible depend upon the mass of the star. Mass is the major factor in deciding the life expectancy of a main sequence star, its estimate, and its glow. Stars on the main sequence moreover show up to be constant for long periods of time. Any demonstration of such stars must be able to account for their stability. The main sequence is the organization where a star spends most of its presence. Relative to other stages in a star's life, which is extremely long. Nucleosynthesis basically alludes to the generation of nuclei heavier than hydrogen. This happens in main sequence stars through two fundamental forms, the proton-proton chain and the CNO cycle which is carbon, nitrogen, and oxygen. Primordial nucleosynthesis occurred exceptionally early in the history of the Universe, coming about in a few heliums and little follow of lithium and deuterium, the overwhelming isotope of hydrogen.

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The values of all sub-parts have been obtained.

(1).  The maximum factored load the beam can withstand is 45.2 kN/m.

(2).  The moment resistance of the cross-section is 291735.65 Nm.

(3).  The factored moment demand is 27939.6 Nm

1) To draw the governing shear and bending moment diagram for the factored load, we need to first calculate the maximum factored load that the beam can withstand.

The maximum factored load on the beam is given by:

Dead Load = 20 kN/m + 15 kN

                   = 35 kN/m.

Live Load = 2 kN/m + 1 kN

                = 3 kN/m.

Total Factored Load = 1.2 x Dead Load + 1.6 x Live Load

                                  = 1.2 x 35 kN/m + 1.6 x 3 kN/m

                                  = 45.2 kN/m.

The maximum factored load the beam can withstand is 45.2 kN/m.

The shear force and bending moment diagrams for the given factored load can be obtained as shown below:

Shear Force Diagram:

Bending Moment Diagram:

2) To calculate the moment resistance of the cross-section, we can use the formula:

MR = σst A'(d - a/2) + 0.85f'c A''(d - a/2)

Where, σst = yield stress of tension steel [σst = fy / γst],

γst = safety factor for tension steel [γst = 1.15A']

A' = area of tension steel, [A'' = b(d - a)].

Where,

b = width of the beam [b = 600 mm],  

d = total height of the beam [d= 1000 mm],

a = effective depth of tension steel [a = 920 mm]

f'c = compressive strength of concrete [f'c = 25 MPa],

MR = σst A'(d - a/2) + 0.85f'c A''(d - a/2)

MR = (400 / 1.15) x 10 x (1000 - 920/2) + 0.85 x 25 x 590 x (1000 - 920/2)

MR = 291735.65 Nm

The moment resistance of the cross-section is 291735.65 Nm.

3) To check if this cross-section is adequately designed to resist the factored bending moment (LRFD), we need to calculate the factored moment demand and compare it with the moment resistance.

The factored moment demand is given by:

MF = ϕ x Mu

Where,ϕ = resistance factor = 0.9, Mu = factored bending moment

Mu = 1.2 x Dead Load x L2 / 8 + 1.6 x Live Load x L2 / 8 + 1.2 x (Dead Load + Live Load) x L2 / 2

   = 1.2 x 35 x 152 / 8 + 1.6 x 3 x 152 / 8 + 1.2 x 38 x 152 / 2

   = 31044 Nm

MF = ϕ x Mu

     = 0.9 x 31044

    = 27939.6 Nm

The factored moment demand is 27939.6 Nm, which is less than the moment resistance of the cross-section, i.e., 291735.65 Nm.

Therefore, this cross-section is adequately designed to resist the factored bending moment.

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Answer:

constant acceleration,

Explanation:

when an object is moving without any change in direction,its acceleration is regarded as zero which also means that the object is moving at a constant acceleration.

If no forces are acting on a moving object, the object will continue to move with constant momentum.

To find the answer, we need to know about the force.

Thus, we can conclude that if no forces are acting on a moving object, the momentum is constant.

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To find the energy of the scattered x-ray, we can use the Compton scattering formula:\(Δλ = (h / (m_e * c)) * (1 - cos(θ))\)

Where:
Δλ is the change in wavelength
h is Planck's constant \((6.626 × 10^-34 J·s)\)
m_e is the electron mass\((9.10938356 × 10^-31 kg)\)
c is the speed of light\((3 × 10^8 m/s)\)
θ is the scattering angle

Given that the incident x-rays have an energy of 300 keV and the scattered rays are detected at 37.0°C relative to the incident rays, we need to convert the energy from keV to joules.

\(1 keV = 1.602 × 10^-16 J\)

So, the incident x-ray energy is:
\(E_i = 300 keV * (1.602 × 10^-16 J/keV) = 4.806 × 10^-14 J\)

Now, we need to find the change in wavelength using the scattering angle. Since the angle is not given, we can't calculate it directly. Therefore, we can't determine the energy of the scattered x-ray using this information.

We don't have enough information to calculate the energy of the scattered x-ray based on the given data.

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Answer:

below

Explanation:

300 000 km = 300 000 000 m

c = wl * f

3 x 10^8   =  300 000 000 m    *  f

1 hz = f

The amount of heat required to completely sublime 21.0 g of solid dry ice at its sublimation temperature is 15.4 kJ.

To calculate the amount of heat required to completely sublime 21.0 g of solid dry ice (CO2) at its sublimation temperature, we first need to convert the mass of CO2 from grams to moles. The molar mass of CO2 is 44.01 g/mol, so:
21.0 g CO2 / 44.01 g/mol = 0.477 mol CO2
Next, we can use the heat of sublimation for carbon dioxide, which is 32.3 kJ/mol, to calculate the amount of heat required to sublime 0.477 mol of CO2:0.477 mol CO2 x 32.3 kJ/mol = 15.4 kJ
Therefore, the amount of heat required to completely sublime 21.0 g of solid dry ice at its sublimation temperature is 15.4 kJ.To calculate the amount of heat required to completely sublime 21.0 g of solid dry ice (CO2) at its sublimation temperature, you need to use the heat of sublimation for carbon dioxide, which is 32.3 kJ/mol.
First, determine the number of moles of CO2 in 21.0 g. The molecular weight of CO2 is 44.01 g/mol (12.01 for carbon + 2 * 16.00 for oxygen).
Number of moles = (21.0 g) / (44.01 g/mol) = 0.477 mol
Now, use the heat of sublimation (32.3 kJ/mol) to find the amount of heat required:
Heat = (0.477 mol) * (32.3 kJ/mol) = 15.4 kJ
So, the amount of heat required to completely sublime 21.0 g of solid dry ice at its sublimation temperature is 15.4 kJ.

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Answer:

Por que existe una relación entre dichas magnitudes.

Para un pendulo perfecto de largo L, sabemos que el periodo esta definido como:

\(T = 2*\pi *\sqrt{L/g}\)

Donde:

pi = 3.14

L = largo del péndulo

g = aceleración gravitatoria = 9.8 m/s^2

Entonces podemos ver que el periodo es proporcional a la raíz cuadrada de la longitud del péndulo.

Esto es por lo que al analizar datos de un experimento se debería observar una relación entre esas magnitudes.

Answer:This is also known as the law of inertia.     EXPLANATION:  Inertia is the tendency of an object to remain at rest or remain in motion.

Answer:

-2 kg x m/s

Explanation:

-17 + 54 = 35 + x

x = -2

Answer:

suzzi reaches first cuz she is faster

Explanation:

she will be ahead by 3 seconds

Suzy will reach the end of the block first, and her brother will be 2.78 seconds behind her.

To determine who will reach the end of the block first and the time difference between them, we can calculate the time it takes for each of them to cover the one-mile distance.

Suzy's time:

Time = Distance / Speed

Time = 1 mile / 0.12 mi/s

Time = 8.33 seconds

Brother's time:

Time = Distance / Speed

Time = 1 mile / 0.09 mi/s

Time = 11.11 seconds

Now we can compare their times:

Suzy's time: 8.33 seconds

Brother's time: 11.11 seconds

Suzy will reach the end of the block first, and her brother will be behind by:

Time difference = Suzy's time - Brother's time

Time difference = 8.33 seconds - 11.11 seconds

Time difference = -2.78 seconds

The time difference should be a positive value, indicating that Suzy's brother will be behind by 2.78 seconds.

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Explanation:

R = \(\sqrt{(12.0)^{2} + (9.00)^{2}}\) = 15 UNIDADES

Answer:

C=F×W

so, W=C/F

Explanation:

frequency=F

wavelength=W

speed of light =C in that medium

Answer:

True

Explanation:

Velocity is a vector quantity, which means that it carries both magnitude and direction. Hence when direction of a particle changes, although magnitude (speed) may remain same, it's velocity changes due to direction change. For ex. A particle is m... A particle is moving along x axis with speed 1m/s, it's velocity will be represented as 1i (i represents unit vector along x)

But if it now starts moving along y axis, it's velocity is 1j (j represents unit vector along y axis). Hence velocity changes with direction.

brainllest pls .

Answer:

Snell's law is the relation that describes the relationship between the angles of incidence and refraction, with respect to light waves passing through a boundary, such as air and plastic. The law states that the ratio of the sines of the angles of incidence and of refraction is a constant :

n1 sin(t1) = n2 sin(t2)

where n1 and n2 are the refractive indices.

The refractive index is one measure of the speed of light in a material, being defined as the ratio of the speed of light in vacuum relative to that in the considered medium. In your question, the speed of light in air is approcimately that in vacuum, thus n1 = c / c = 1, where c is the speed of light. n2 = c / v, where v is the speed of light in the plastic.

Substituting into Snell's law,

1 sin(72.7) = c / v sin(57.1)

v = c sin(57.1) / sin(72.7)

v = 0.88 c,  or 88% the speed of light.

Explanation:

The speed of light in the plastic block is approximately 198,744,167 m/s.

We can use Snell's Law, which relates the angles of incidence and refraction to the refractive indices of the two media involved.

Step 1: Write down Snell's Law: n1 * sin(θ1) = n2 * sin(θ2)

Step 2: We know that the refractive index of air (n1) is approximately 1, and the angle of incidence (θ1) is 62.7°. The angle of refraction in the plastic (θ2) is 48.1°.

Step 3: Plug in the values: 1 * sin(62.7°) = n2 * sin(48.1°)

Step 4: Solve for n2 (refractive index of the plastic): n2 = sin(62.7°) / sin(48.1°)

Step 5: Calculate the speed of light in the plastic: v = c / n2, where c is the speed of light in a vacuum (3.0 x 10^8 m/s).

Using these steps, you can find the speed of light in the plastic block. Therefore, the speed of light in the plastic block is approximately 198,744,167 m/s.

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Answer:

Increasing the temperature of the rod

Explanation:

Answer: When a car is struck by lightning, the resulting electric field inside the car is zero.

Explanation:

When a charged capacitor is disconnected from a battery and the area of the plates is decreasing, the electric field in the capacitor is increasing.

This can be explained by considering the relationship between the electric field, the charge on the plates, and the area of the plates.The electric field in a capacitor is given by the formula E = Q / (ε₀A), where E represents the electric field, Q is the charge on the plates, ε₀ is the permittivity of free space, and A is the area of the plates. When the capacitor is disconnected from the battery, the charge on the plates remains constant. However, as the area of the plates decreases, the denominator in the formula for the electric field (ε₀A) decreases. Since the charge remains the same, this reduction in the denominator results in an increase in the electric field E.

In simpler terms, the electric field in a capacitor is inversely proportional to the area of the plates. As the area decreases, the electric field strengthens. This occurs because the same amount of charge is now concentrated on a smaller surface area, leading to a higher electric field intensity between the plates. Therefore, when a charged capacitor is disconnected from a battery and the area of the plates is decreasing, the electric field in the capacitor increases due to the concentration of charge on a smaller surface area.

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A pulsar is a neutron star that sweeps a beam of radiation past the Earth each time it rotates. So, option D is correct.

A pulsar is a highly magnetized, rotating neutron star that emits beams of electromagnetic radiation. It is formed from the remnants of a massive star that has undergone a supernova explosion.

As the neutron star spins rapidly, its intense magnetic field causes beams of radiation to be emitted from its magnetic poles. These beams are observed as regular pulses of radiation as the pulsar rotates.

Pulsars are characterized by their precise and regular periods of pulsation, which can range from milliseconds to several seconds.

The emission of radiation occurs along the magnetic axis of the neutron star, and if this axis is not aligned with the rotation axis, the beams of radiation sweep across space like a lighthouse, leading to periodic pulses of radiation detected on Earth.

The discovery of pulsars in 1967 by Jocelyn Bell Burnell and Antony Hewish provided evidence for the existence of neutron stars and opened up new avenues for studying stellar remnants and extreme astrophysical phenomena.

Pulsars are important objects in astrophysics and continue to be studied for their contributions to our understanding of stellar evolution, gravity, and the behavior of matter under extreme conditions.

So, option D is correct.

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We know that the energy of electromagnetic radiation is given by:

where E is the energy, h is Planck's constant and f is the frequency. Before we can use this formula we need to convert the amount of energy given to J so let's do that:

Now that we have the energy of the radiation, we plug it on the energy equation and solve for the frequency:

Therefore, the frequency of the cell phone electromagnetic radiation is:

Now that we know the frequency we just need to remember that the frequency and wavelength of electromagnetic radiation are related by:

Then we have:

Therefore, the wavelength is 0.111 m

Answer:

no because it will also affect other people

Answer:

mass, weight

Explanation:

mass is constant, and weight is dependant on your location

Answer:

I think d

Explanation:

because distance j

has to be the last one that's the only one with distance

The equation for finding the net torque on a dipole is given by τ = p × E, where τ represents the torque, p is the dipole moment, and E is the electric field.

A dipole exhibits a torque because it consists of two opposite charges separated by a distance, and when placed in an electric field, these charges experience forces in opposite directions, causing a rotational effect or torque. The torque tends to align the dipole moment with the direction of the electric field, and the strength of the torque depends on the magnitude of the dipole moment and the electric field, as well as the angle between them.

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a) The greenhouse effect refers to the process by which certain gases in the Earth's atmosphere trap and re-emit heat from the sun, leading to a warming effect on the planet's surface.

These gases, including carbon dioxide, water vapor, methane, and others, act like a blanket around the Earth, absorbing and trapping the sun's radiation and preventing it from escaping into space.

b) Atmospheric water vapor is a key component of the Earth's climate system, as it plays a crucial role in the greenhouse effect. As water vapor absorbs and re-emits radiation from the sun, it helps to trap heat in the atmosphere and keep the planet warm.

However, the amount of water vapor in the atmosphere is strongly influenced by temperature and other factors, which can in turn affect climate patterns and weather events.

c) The increased concentration of carbon dioxide in the atmosphere changes the climate because it enhances the greenhouse effect. Carbon dioxide is a particularly potent greenhouse gas, as it absorbs and re-emits radiation across a range of wavelengths, effectively trapping more heat in the atmosphere. As humans burn fossil fuels and engage in other activities that release carbon dioxide into the air, the concentration of this gas increases, leading to a buildup of heat-trapping gases and a corresponding increase in global temperatures.

d) The melting of continental glaciers and sea ice in polar regions can accelerate the rise in temperature through a process known as positive feedback. As the ice melts, it exposes more land and water, which in turn absorb more solar radiation and heat up. This leads to further melting, which exposes even more land and water, and so on.

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Answer:

A

Explanation:

I just did it :)

Answer:

It is A

Explanation:

I did it and got a 100