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Astrologers use the stars to predict the future. This could be considered (2 points) Select one: a. science because we can study the stars. b. science because it is based on beliefs. c. pseudoscience because it involves beliefs not facts. d. pseudoscience because it is backed by scientific studies.

Answer:

The answer is B. speed of light

Explanation:

The energy of a photon with a frequency of 6.0 x 1020 Hz is 3.976 x 10-13 joules.

To find the energy of a photon, we can use the equation E = hf, where

E represents the energy, h is Planck's constant (6.626 x 10-34 J·s), and f is the frequency of the photon. Substituting the given frequency (f = 6.0 x 1020 Hz) into the equation and using Planck's constant, we calculate the energy (E) as follows:

E = (6.626 x 10-34 J·s) (6.0 x 1020 Hz) = 3.976 x 10-13 J. Although this amount of energy might seem very small, it's important to remember that visible light and other forms of electromagnetic radiation consist of vast numbers of photons, which collectively can have a significant amount of energy.

The peak wavelength of radiation emitted from human skin at 33.0°C is approximately 9465.7 nm or about 9.465 microns, calculated using Wien's displacement law.

The student's question about the peak wavelength of radiation emitted from the skin at a certain temperature relates to Wien's displacement law. This law states that the peak wavelength of the radiation is inversely proportional to the temperature of the radiating body when the temperature is in Kelvin. Firstly, we need to convert the skin temperature from Celsius to Kelvin, which would be 33.0°C + 273.15 = 306.15 K. Using Wien's law (with a constant of approximately 2.898 x 10^6 nm·K), we can calculate the peak wavelength with the formula λ(max) = b / T. So, the peak wavelength would be λ(max) = 2.898 x 10^6 nm·K / 306.15 K, which gives us a peak wavelength of approximately 9465.7 nm or about 9.465 microns.

The speed of the train relative to the girl is 65 m/s.

The speed of the train relative to the girl can be calculated by subtracting the girl's speed from the train's speed. In this case, the train is moving at 75 m/s and the girl is running towards the front of the train at 10 m/s. So the speed of the train relative to the girl would be 75 m/s - 10 m/s = 65 m/s.

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The correct option is B. 65 m/s, South.

The given problem can be solved using concepts of relative motion.

Given that the girl is running toward the front of a train at 10 m/s and the train is going 75 m/s on the Southbound tracks. Hence, both the girl and the train are moving in the same direction, i.e. southwards.

So, the speed of the train relative to the girl can be given as:

[tex]v_{tg} = v_t - v_g[/tex]

where, [tex]v_{tg}[/tex] is the speed of train with respect to the girl

[tex]v_t[/tex] is the speed of train

[tex]v_g[/tex] is the speed of the girl

[tex]\therefore v_{tg} = 75 \hspace{0.8mm} m/s - 10 \hspace{0.8mm} m/s[/tex]

or, [tex]v_{tg} = 65 \hspace{0.8mm} m/s[/tex]

Hence, the speed of the train relative to the girl is 65 m/s due south.

The complete question is:

A girl is running toward the front of a train at 10 m/s. If the train is going 75 m/s on the Southbound tracks, what is the speed of the train relative to the girl?

A. 10 m/s, South

B. 65 m/s, South

C. 65 m/s, North

D. 10 m/s, North

Using the equation for the speed of light, we find that the wavelength of a radio wave broadcasting at 102.1 MHz frequency in Springfield is approximately 2.94 meters.

The length of a wave, often termed wavelength, can be deduced if the frequency is known, using the formula of the speed of light, which is wavelength times frequency (or c = λν). In this equation, 'c' signifies the speed of light (3 x 10^8 m/s), 'λ' is the wavelength, and 'ν' is the frequency. Given frequency = 102.1 MHz = 102.1 x 10^6 Hz, we can rearrange the formula to find the wavelength: λ = c/ν = 3 x 10^8 m/s / 102.1 x 10^6 Hz = 2.94 m. Therefore, the length of the wave is approximately 2.94 meters.

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Approximately [tex]\( 3.121 \times 10^{19} \)[/tex] electrons flow through the electrical device during the [tex]10\ seconds[/tex] when a current of [tex]5.0 \ A[/tex] is flowing.

To determine how many electrons flow through the electrical device, we can use the relationship between current, time, and the charge carried by electrons.

Given:

Current [tex]\( I = 5.0 \) A[/tex]

Time [tex]\( t = 10 \) seconds[/tex]First, calculate the total electric charge [tex]\( Q \)[/tex] that flows through the device using:

[tex]\[ Q = I \times t \][/tex]

Substitute the given values:

[tex]\[ Q = 5.0 \, \text{A} \times 10 \, \text{s} = 50 \, \text{C} \][/tex]

Now, we know that 1 Coulomb ([tex]C[/tex]) corresponds to approximately[tex]\( 6.242 \times 10^{18} \) electrons.[/tex]

To find out how many electrons [tex]\( N \)[/tex] flow through the device, convert the charge [tex]\( Q \)[/tex] into electrons:

[tex]\[ N = Q \times (6.242 \times 10^{18} \, \text{electrons/C}) \][/tex]

Substitute [tex]\( Q = 50 \, \text{C} \)[/tex]

[tex]\[ N = 50 \times 6.242 \times 10^{18} \, \text{electrons} \][/tex]

[tex]\[ N = 312.1 \times 10^{18} \, \text{electrons} \][/tex]

[tex]\[ N = 3.121 \times 10^{19} \, \text{electrons} \][/tex]

Answer:

IMA = Distance of Effort/ Distance of resistance

Explanation:

M.A is the force amplification of a machine.

Ideally, a screw driver has varying diameters on two ends, the shaft and the handle, however, since the question does not provide those parameters, we will assume shaft and handle have the same diameter.

DE = 4

DR = 1

Therefore, IMA = [tex]\frac{4}{1} = 4[/tex]

If diameter is given, IMA is calculated by

Area of Effort/ Area of resistance i.e. AE/AR

The magnetic force on a charged particle moving through a magnetic field perpendicular to its velocity can cause the particle to move in a circular path. The radius of this path can be calculated using the formula r = mv/qB, resulting in an approximate radius of 42 millimeters for the given parameters.

In physics, one of the forces that can cause a particle to undergo uniform circular motion is the magnetic force. This happens when a charged particle moves in a direction perpendicular to a magnetic field. The magnetic force, being perpendicular to the velocity of the particle, acts as a centripetal force, constantly changing the direction of the particle's velocity, thus causing the particle to move in a circular path. The radius of this circular path can be obtained using the equation for the magnetic force acting on a moving charged particle, F = qvB, where q is the charge of the particle, v is the speed of the particle, and B is the magnetic field strength.

So the magnetic force equals the centripetal force when qvB = mv²/r, which allows us to solve for r, the radius of the path: r = mv/qB.

Substituting the given values: r = (2.05*10^-12 kg * 67.3*10^3 m/s) / (3.32*10^-6 C * 7.85 T), we find the radius r is about 0.042 meters or 42 millimeters. Note we have included unit conversions for mass m from picograms (pg) to kilograms (kg), speed v from kilometers per second (km/s) to meters per second (m/s), and charge q from microcoulombs (μC) to coulombs (C).

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The radius of the particle's circular path is 42 millimeters.

Given:

A uniform magnetic field with magnitude B = 7.85 mT

A negatively charged particle with charge q = -3.32 μC = -3.32 × 10⁻⁶ C and mass m = 2.05 pg = 2.05 × 10⁻¹⁵ kg

The particle moves with a speed of v = 67.3 km/s = 67.3 × 10³ m/s perpendicular to the magnetic field

The magnetic force on a charged particle moving in a magnetic field is given by the equation:

F = qvB sinθ

where θ is the angle between the velocity of the particle and the magnetic field. In this case, θ = 90°, so sinθ = 1. Therefore, the magnetic force on the particle is:

F = qvB = (-3.32 × 10⁻⁶ C)(67.3 × 10³ m/s)(7.85 × 10⁻³ T) = 1.75 × 10⁻² N

The magnetic force is also the centripetal force that keeps the particle moving in a circular path. Therefore, we can equate the magnetic force to the centripetal force to find the radius of the particle's circular path:

F = mv²/r

Solving for r, we get:

r = mv²/F = (2.05 × 10⁻¹⁵ kg)(67.3 × 10³ m/s)²/(1.75 × 10⁻² N) = 0.042 m = 42 mm

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Answer:

The force exerted by the child is 460.8 N

Explanation:

We have given that pressure [tex]P=1.2\times 10^5pa[/tex]

Radius of the circular piston r = 0.035 m

So area [tex]A=\pi r^2=3.14\times 0.035^2=0.003846m^2[/tex]

We have to find the force exerted by the child

We know that force is given by

[tex]Force=pressure\times area[/tex]

So force will be [tex]Force=1.2\times 10^5\times 0.00384=460.8N[/tex]

So the force exerted by the child is 460.8 N

Pressure

The definition of pressure is given as the force per unit area

The unit of pressure is Newton

Explanation:

Given data

Pressure = 1.2 × 105 pa

diameter = 0.035 m

We know that the expression for pressure is given as

Pressure = Force/Area

Making Force the subject of the formula

Force = Pressure * Area

But we do not know the area

Now let us find the area

Area = πd^2/4

Area= (3.142*(0.035)^2)/4

Area = 3.142*0.001225/4

Area= 0.00384895/4

Area= 0.000962 m^2

Force = 1.2 × 10^5*0.000962

Force = 115.44 Newton

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Answer:

Length of the pole is 27ft. ( rouding up to the nearest foot)

Explanation:

To solve this problem you need to understand that the the shadow cast by the pole on the ground connected to the pole itself and to the imaginary line of sun light forms a triangle with 3 different angles, please see the drawing to a better understanding.

* The sum of the internal angles of any triangle must be 180° then;

α: angle of the elevation of the sun= 64°

angle of the pole to the ground= (90-19)= 71°

β = 180 - ( 64+71) = 45°

*To find the length of the pole we can use the law of Sines;

|BC| / sin (α) = |AC| / sin (β)

|BC|= Length of the pole

|AC|= shadow of the pole on the ground which is known to be 21 ft

|BC| / sin (64°) = 21 / sin (45°)

|BC|= 21 x [sin (64°)/ sin (45°)]

|BC|= 21 x 1.27≅ 26.67 ft

The wavelength of an electron with a given kinetic energy of 5.00 eV can be found using the de Broglie wavelength formula and first converting the kinetic energy into joules.

To find the wavelength of the electron with kinetic energy of 5.00 eV, we will use the de Broglie wavelength formula, which links a particle's momentum to its wavelength. This is given by λ = h/p where λ is the wavelength, h is Planck's constant (6.626 x 10-34 Js), and p is the momentum of the particle.

First, we need to convert the kinetic energy into joules. The energy in joules (E) is given by E = K x q, where K is the kinetic energy in electronvolts (eV) and q is the electron charge (1.602 x 10-19 C). For the given energy of 5.00 eV, the energy in joules will be E = 5.00 eV x 1.602 x 10-19 C/eV = 8.01 x 10-19 J.

Now, we can calculate the electron's momentum using the relation p = √(2mE), where m is the electron's mass (9.109 x 10-31 kg). After solving, the momentum is used in de Broglie's formula to find the wavelength.

The magnetic flux through each loop of a coil can be calculated using the given expression. The magnetic moment of the coil can be found by multiplying the current and the area of the loop. Faraday's law states that a changing magnetic flux induces an electromotive force in a circuit.

The magnetic flux through each loop of a 75-loop coil can be calculated using the expression: (8.8t−0.51t³)×10−²t⋅m², where t represents time in seconds. The magnetic flux is a measure of the magnetic field passing through a surface. It can also be calculated using the product of the magnetic field strength and the area of the loop.

The magnetic moment of the coil can be found using the formula μ = IA, where I is the current and A is the area of the loop. Substituting the given values, we find that the magnetic moment equals 2.5 × 10⁻⁶ A·m².

Faraday's law states that a changing magnetic flux through a loop induces an electromotive force (emf) in the circuit. Therefore, if the current through the coil varies with time, the magnetic flux will change accordingly and an emf will be induced in the circuit.

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early plants added oxygen to the atmosphere. They did this by photosynthesis process by absorbing the carbon dioxide from the atmosphere and giving away oxygen in return.

This was important because life is not possible without oxygen present in the atmosphere.

They consumed the carbon dioxide from the atmosphere and reduced the temperature of the planet also.

Electric field vectors point away from protons because protons are positively charged, and electric field lines always point away from positive charges and toward negative charges.

The direction of electric field vectors is determined by the nature of the charge that produces them. Specifically, electric field lines point away from positive charges and toward negative charges. This is because the electric field vector always points in the direction of the force that would be exerted on a positive test charge.

1. Gravitational fields always point towards the source of the field (like toward Earth) because gravity is an attractive force.

2. On the other hand, electric fields can be either attractive or repulsive. For a positive charge, the electric field vectors radiate outward because like charges repel, meaning if you place a positive test charge near a proton, it will be repelled outward.

Therefore, the correct answer is: protons are positively charged (option 4).

Final answer:

When you rub a balloon against your shirt, electrons are transferred from your shirt to the balloon, giving the balloon a negative charge. The negative charge on the balloon attracts the positive charges in the ceiling, causing it to stick.

Explanation:

When you rub a balloon against your shirt, electrons are transferred from your shirt to the balloon, giving the balloon a negative charge. The balloon becomes negatively charged and the shirt becomes positively charged. When you touch the negatively charged balloon to the ceiling, the positive charges in the ceiling are attracted to the balloon, causing it to stick.

We first observe that the particle moves in the direction of the vector

[tex](3\,\vec\imath + 4\,\vec\jmath + 3\,\vec k) - (\vec\imath - \vec k) = 2\,\vec\imath + 4\,\vec\jmath + 4\,\vec k[/tex]

so the initial velocity vector [tex]\vec v_0[/tex] is parallel to this vector. Given its initial speed is 3 at [tex]t=0[/tex], this means for some scalar constant [tex]c>0[/tex], we have

[tex]\vec v_0 =  2c\,\vec\imath + 4c\,\vec\jmath + 4c\,\vec k[/tex]

such that

[tex]\|\vec v_0\| = \sqrt{(2c)^2 + (4c)^2 + (4c)^2} = 6c = 3 \implies c = \dfrac12[/tex]

so that the initial velocity is

[tex]\vec v_0 = \vec\imath + 2\,\vec\jmath + 2\,\vec k[/tex]

Now, use the fundamental theorem of calculus to compute the velocity and position functions.

[tex]\displaystyle \vec v(t) = \vec v_0 + \int_0^t \vec a(u) \, du \\\\ ~~~~ = (\vec\imath + 2\,\vec\jmath + 2\,\vec k) + \int_0^t (2\,\vec\imath + 4\,\vec\jmath+4\,\vec k) \, du \\\\ ~~~~ = (\vec\imath + 2\,\vec\jmath + 2\,\vec k) + (2t\,\vec\imath + 4t\,\vec\jmath+4t\,\vec k) \\\\ ~~~~ = (1 +2t)\,\vec\imath + (2+4t)\,\vec\jmath + (2+4t)\,\vec k[/tex]

[tex]\displaystyle \vec r(t) = \vec r_0 + \int_0^t \vec v(u) \, du \\\\ ~~~~ = (\vec\imath - \vec k) + \int_0^t \left((1 +2u)\,\vec\imath + (2+4u)\,\vec\jmath + (2+4u)\,\vec k\right) \, du \\\\ ~~~~ = (\vec\imath - \vec k) + ((t+t^2)\,\vec\imath + (2t+2t^2)\,\vec\jmath + (2t+2t^2)\,\vec k) \\\\ ~~~~ = (t^2+t+1)\,\vec\imath + (2t^2+2t)\,\vec\jmath + (2t^2+2t-1)\,\vec k[/tex]

The number of photons per square meter per second falling on the earth's surface, given the solar radiation rate and average wavelength is calculated to be 5.36 x 10²¹ photons/m2·s.

The energy of the average visible photon is calculated using the formula E= hc/λ, where h is Planck's constant, c is the speed of light and λ is the wavelength. With the given values, we get the energy E by substituting h=6.62607 × 10⁻³⁴ J·s, c=3 × 108 m/s, and λ=560 × 10⁻⁹ m resulting in E= 3.546 × 10⁻¹⁹ J. The number of photons per meter square per second can be calculated by dividing the rate of solar radiation, 1900 W/m2 or 1900 J/s·m2 by the energy per photon, yielding 5.36 x 10²¹ photons/m2·s.

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