As you drive by an AM radio station, you notice a sign saying that its antenna is 142 m high.
If this height represents one quarter-wavelength of its signal, what is the frequency of the station?
f= _______kHz

Answer:

Ernest Rutherford observed that particles with a positive charge deflected when passing through a thin sheet of gold foil, concluding that the atom's positive part is small and dense.

Explanation:

The Ernest Rutherford experiment describes planetary model of an atom. According to the model, an atom has a tiny, compact, positively charged centre called a nucleus, where almost all of the mass is concentrated, while light, negatively charged particles called electrons orbit far around it, much like planets orbit the Sun. In his experiment, the observation that a positive charge is deflected through a thin sheet of gold foil led to the conclusion that the deflection some of the positive charge occurs in a small region of the atom. At the same time, the majority passed through the atom (which was also concluded to be empty space).

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Answer:

Joule’s law of heating states that when a current ‘i ' passes through a conductor of resistance ‘r’ for time ‘t’ then the heat developed in the conductor is equal to the product of the square of the current, the resistance and time.

H = i 2 rt

The reason behind the heat produced is the collision of the free electrons with the lattice ions or atoms while accelerating in presence of the external electric field.

we know that

volt= work done/ total charge or v = w/q

from this we get w= vq

we know that current i = q / t

so q = it

putting this in prev equation

we get w = vit

from ohms law v = ir

putting it in prev eq we get

w = irit = i2rt joule as work is stored as heat soH = I2RT Joules

if a current carrying conductor having resistance (r) gets heated by to passing of current (i) for time (t) and the heat thereby produced be H

joules law states that

H propotional to i^ 2 when r and t are constant

H propotional to r when I and t are constant

H propotional to t when r and I constant

To set up two glass tubes with closed ends, we can follow the given instructions by using a cotton cloth. Firstly, acquire two glass tubes with a diameter of 4 cm each. These tubes should be open at one end.

Next, take a piece of cotton cloth and securely tie it around the open end of each tube. Ensure that the cloth tightly covers the opening, creating a closed end.

The purpose of closing one end of the tube is to create a container or chamber that can be used for various experiments or demonstrations. By closing one end, we restrict the flow of any substances placed inside the tube, allowing for controlled observations or reactions within the confined space.

It's important to note that the cotton cloth should be tied tightly enough to prevent any air or substance from escaping or entering the tube. This ensures that the closed end remains sealed during experiments.

Therefore, With these prepared glass tubes, you can now explore different experiments involving gases, pressure, or other reactions that require a closed chamber. The closed-end design allows for the containment and manipulation of substances within the tubes, enabling a range of scientific investigations.

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Answer:

8 v

Explanation:

power = watts = v i

                 36   = v (4.5)

                   v = 8 v

Answer:

C. curved

Explanation:

researchers have shown that light can also travel in a curve, without any external influence

The average speed of the particles in terms of the speed of light is 0.976c. Given that, The particle-X has a lifetime of 256.2.A particle track detector is used to measure the speed of particles. On average, the particles leave 10.6 cm long tracks before they decay into other particles that are not observable by the detector.

The formula to calculate the average speed of the particles is given as;v = d / t Where,v = velocity of the particles, d = distance traveled by the particles, and t = time taken by the particles. The distance traveled by the particles before they decay is 10.6 cm = 0.106 m. The lifetime of the particle is given as 256.2 s. Therefore, time taken by the particle to decay, t = 256.2 s.

The speed of the particles can be calculated as follows; v = d / tv = 0.106 / 256.2v = 4.135 × 10^-4 m/s The speed of the particles in terms of the speed of light can be calculated as follows; Speed of light = 3 × 10^8 m/s Average speed of the particles in terms of the speed of light, v/c= (4.135 × 10^-4) / (3 × 10^8)= 0.976 × 10^-8= 0.976cTherefore, the average speed of the particles in terms of the speed of light is 0.976c.

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Answer:

Potential Energy to Kenetic Energy

Explanation:

When holding a ball in the air, the ball has potential energy. Once you drop the ball, the ball gains Kenetic Energy

For an object with a height of 31 cm placed 2.0 mm in front of a convex mirror with a focal length of -0.75 mm, the image is located 1.2 mm behind the mirror and has a magnification of 0.6.

To find the location and magnification of the image for an object with a height of 31 cm placed 2.0 mm in front of a convex mirror with a focal length of -0.75 mm, we'll use the mirror equation and magnification formula.
Step 1: Use the mirror equation:
1/f = 1/do + 1/di
where f is the focal length, do is the object distance, and di is the image distance.
Step 2: Plug in the given values:
1/(-0.75) = 1/2.0 + 1/di
Step 3: Solve for di:
1/di = 1/(-0.75) - 1/2.0
1/di = -1.333 + 0.5
1/di = -0.833

Step 4: Find di by taking the reciprocal:
di ≈ -1.2 mm
The image is located 1.2 mm behind the mirror.
Step 5: Use the magnification formula:
M = -di/do
Step 6: Plug in the values for di and do:
M = -(-1.2)/2.0
M = 0.6. Therefore,  the image is located 1.2 mm behind the mirror and has a magnification of 0.6.

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Complete question : An object with a height of 31 cm is placed 2.0 mm in front of a convex mirror with a focal length of -0.75 mm. Find the location and magnification of the image.

Answer: It’s Column 1

5.4, 5.7, 5.6, 5.7, 5.6

Explanation:

Answer: it  is proposes that in Earth's prebiotic history, simple organic matter was exposed to energy in the form of volcanoes and electrical storms

Explanation:

Answer:

How many electrons does an atom require to have a stable configuration?

eight electrons

In general, atoms are most stable, least reactive, when their outermost electron shell is full. Most of the elements important in biology need eight electrons in their outermost shell in order to be stable, and this rule of thumb is known as the octet rule.

How is this achieved in an ionic bond?

Ionic bonds are a class of chemical bonds that result from the exchange of one or more valence electrons from one atom, typically a metal, to another, typically a nonmetal. This electron exchange results in an electrostatic attraction between the two atoms called an ionic bond.

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outermost (valence) electrons, atoms can fill up their outer electron shell and gain stability.

Explanation:

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A fighter jet being launched from such an aircraft carrier using a steam-powered catapult and its own engines. Its engines produce 2.3 x 105 N of thrust.

What speed is reached when a jet fighter aircraft is fired from a slingshot on an aircraft carrier?

42 m/s On an aircraft carrier, a catapult is used to launch a jet fighter. Just at end of the sling, it takes 2 seconds to achieve velocity of 42 m/s. What is the catapult's length if the acceleration is constant?

How strong is the aircraft carrier's catapult?

Catapults A 48,000-pound aeroplane was launched 300 feet and increased in speed from 0 to 165 miles an hour in two seconds by four steam-powered catapults. On every

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Given:

There is a closed path for the flow of current.

Answer and explanation:

A correct option is an option (A). Since the path is closed, the current will flow through the circuit.

An option (B) is incorrect because the charge does not accumulate in a closed path.

Option (C) is also incorrect because the path is closed, and the circuit cannot be open.

Option (D) is also an incorrect option because there is always a resistance provided by the metal wire.

If energy is conserved, then initial (PE + KE) = final (PE + KE). So, the correct option is A.

The law of conservation of energy states that, energy can neither be created nor be destroyed, but can be transformed from one form to another.

Here,

According to law of conservation of energy,

The total energy of an isolated system remains constant. That means, the total energy of the system in the initial state will be same as that in the final state.

The total mechanical energy is the sum of kinetic energy and potential energy.

TE = KE + PE

Therefore, the energy to be conserved in the system,

Initial TE = Final TE

So, Initial (KE + PE) = Final (KE + PE)

Hence,

If energy is conserved, then initial (PE + KE) = final (PE + KE).

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Linguists call small units of sound that carry meaning on their own "morphemes".

Actually, phonemes are the smallest units of sound in a language that can distinguish meaning. They are abstract units of sound that differentiate one word from another word in a language. For example, in English, the sounds /p/ and /b/ are phonemes because they distinguish words like "pat" and "bat".

Morphemes, on the other hand, are the smallest units of language that carry meaning. They can be made up of one or more phonemes. For example, the word "cats" has two morphemes: "cat" and "-s" (which indicates plurality), and each of these morphemes is made up of phonemes.

So while phonemes are important in distinguishing meaning, morphemes are the smallest units of language that carry meaning on their own.

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Answer:

The gravity of the Sun keeps the planets in their orbits. They stay in their orbits because there is no other force in the Solar System which can stop them.

Explanation:

Answer:

f = 4000 / 30 sec = 133.3    vibrations/sec

P = 1 / f = .0075 sec       period of 1 vibration

Answer:

North Korea I'm pretty sure

The mass media present mental disorders by the daily soap programs and movies.

Mass media is the means of communication that reach large numbers of people in a few seconds through optical fiber transmission cables connection, such as television, newspapers, magazines, and radio.

Studies show that both entertainment and news media provide dramatic and distorted images of mental disorders. It can lead to more dangerous personality to develop in people including fear, rejection, derision and ridicule. The criminal activity has received heavy coverage in the mass media.

Thus, the mass media present mental disorders by the daily soap programs and movies.

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Answer: He's a superhero in a fictional world

Explanation: Superheroes, such as Superman and Flash, defy physics because they were created as a form of entertainment. The DC world isn't realistic. Don't think too much on it.

The velocity of the monitor as it hits the ground is equal to 40.58 m/s.

Given the following data:

Scientific data:

In accordance with the law of conservation of energy, the potential energy possessed by the monitor at the roof top would be equal to the kinetic energy possessed by the monitor at the ground:

\(PE=KE\\\\mgh=\frac{1}{2}mv^2\\\\2mgh=mv^2\\\\V=\sqrt{2gh}\\\\V=\sqrt{2 \times 9.8 \times 84}\\\\V=\sqrt{1646.4}\)

V = 40.58 m/s.

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Answer:

Below

Explanation:

Half full means 100 liters to drain out

  net rate of water draining out is   32 - 10 = 22 g/s  or 22 ml/s = .022 L/s

   100 L / .022 L / s  = 4545.45 seconds  Divide by 60 to find minutes =

    75.8 minutes

The time taken to drain the tank completely is 75.8 minutes.

Density of a substance is defined as the volume occupied per unit mass of the substance.

Volume of water tank, V = 200 L

Rate at which water is entering the tank, r₁ = 10 g/s

Rate at which water is withdrawn from the tank, r₂ = 32 g/s

Density of water, D = 1000 g/L

Given that the tank was initially half full. So, the drained volume is 100L.

Net rate of water that is draining out, r = r₂ - r₁

r = 32 - 10

r = 22 g/s = 0.022 L/s

Therefore, the time taken to drain the tank completely,

t = 100/r

t = 100/0.022

t = 4545.45 s

t = 4545.45/60

t = 75.8 minutes

Hence,

The time taken to drain the tank completely is 75.8 minutes.

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The force constant needed to produce a period of 0.280 s for a 0.0240-kg mass in a cuckoo clock is 63.7 N/m.

In a simple harmonic motion system, the period is dependent on the mass and the force constant. The period is defined as the time required for one complete oscillation. For the cuckoo clock system described in the question, the mass of the bouncing object is given as 0.0240 kg and the period is given as 0.280 s. To find the force constant, we can use the formula for the period of a mass-spring system, T = 2π√(m/k), where T is the period, m is the mass, and k is the force constant. Solving for k, we get k = m(2π/T)^2. Substituting the given values, we get k = 63.7 N/m. Therefore, the force constant needed to produce a period of 0.280 s for a 0.0240-kg mass is 63.7 N/m.

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The lighter block will also accelerate to the right with an acceleration of -0.82 m/s².

(a) μ = 0

The heavier block will accelerate to the right with an acceleration of:

a = F / m = k x / m = (3.70 N/m) (0.0864 m) / 0.261 kg = 1.22 m/s²

The lighter block will also accelerate to the right with an acceleration of 1.22 m/s².

(b) μ = 0.110

The heavier block will accelerate to the right with an acceleration of:

a = F - μk / m = k x / m - μk / m = (3.70 N/m) (0.0864 m) / 0.261 kg - (0.110)(0.261 kg)(9.80 m/s²) = 0.68 m/s²

The lighter block will not accelerate because the force of friction is greater than the force of the spring.

(c) μ = 0.480

The heavier block will accelerate to the right with an acceleration of:

a = F - μk / m = k x / m - μk / m = (3.70 N/m)(0.0864 m) / 0.261 kg - (0.480)(0.261 kg) (9.80 m/s²) = -0.82 m/s²

Therefore, the lighter block will also accelerate to the right with an acceleration of -0.82 m/s².

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Calculating the maximum height it reaches during its flight, we find that the ball will rise to a height of approximately 45.92 meters before coming back to Earth.

When the ball is thrown straight up, it moves against the force of gravity, which slows it down until it reaches its highest point, where its velocity becomes zero. At this point, the ball starts to fall back to Earth.

We use the kinematic equation to calculate the maximum height (h) reached by the ball:

v^2 = u^2 + 2as

Where:

v = final velocity (0 m/s at the highest point)

u = initial velocity (30 m/s)

a = acceleration (acceleration due to gravity, approximately -9.8 m/s^2)

s = displacement (maximum height reached)

Rearranging the equation, we have:

s = (v^2 - u^2) / (2a)

Substituting the values into the equation:

s = (0^2 - 30^2) / (2 * -9.8)

s = -900 / -19.6

s ≈ 45.92 meters

Therefore, the ball will rise to a height of approximately 45.92 meters before coming back to Earth.

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Answer:

Josie's ball faster than T

La adicion de vectores permite encontrar la repuesta para la velocidad resultante del avión es:

Las magnitudes vectoriales son cantidades tienen modulo y dirección, la velocidad es una de estas magnitudes, por lo tanto deben ser sumada usando álgebra vectorial.

Un sistema de referencia es un sistema desde donde realizar las mediciones, en este caso indican que usemos un sistema de los puntos cardinales.

En el adjunto podemos ver un esquema de los vectores velocidad y su resultante, realicemos el calculo de la resultante por método analíticos

Indican que el valor de la velocidad hacia el Este es vₓ = 20 m/s y la velocidad hacia el Norte es v_y = 90 m/s, por lo tanto, para la magnitud usamos el Teorema de Pitágoras

           \(R= \sqrt{v_x^2 + v_y^2}\)

           R = \(\sqrt{20^2 + 90^2}\)

          R = 92,2 m/s

Para encontrar la direccion usemos trigonometría

          tan θ = \(\frac{v_y}{v_x}\)

          θ = tan⁻¹ \(\frac{v_y}{v_x}\)

          θ = tan⁻¹ 20/90

          θ = 12,5º

La dirección se lee 12,5º al Norte del Este

En conclusión usando la suma de vectores  podemos encontrar la repuesta para la velocidad resultante del avión es:

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Over millions of years, the surface temperature of the sun (to) is slowly increasing, while the luminosity of the sun (lo) is slowly increasing as well. This is due to the natural evolution of stars like the sun. As the sun burns its fuel, hydrogen, through nuclear fusion, it gradually transforms into helium.

As this process occurs, the core of the sun becomes denser, leading to an increase in temperature and pressure. This, in turn, causes the outer layers of the sun to expand, resulting in an increase in surface temperature and luminosity.

As the sun continues to burn its fuel, it will eventually reach a stage called the red giant phase. During this phase, the sun will expand even further and its surface temperature and luminosity will continue to increase. However, this process takes millions of years to occur. So, while the changes are happening, they are very gradual and not noticeable within our human timescale.

It is important to note that the sun's evolution and changes in surface temperature and luminosity occur over long periods of time, more than millions of years. This gradual increase in temperature and luminosity is a natural part of the life cycle of stars like the sun.

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