An AM radio station's antenna is constructed to be lambda divided by 4 tall, where lambda is the wavelength of the radio waves. How tall should the antenna be for a station broadcasting at a frequency of 870 kHz?

Answer: solar power converters

Answer:

Outlets besides a battery

Answer:

I think its the helicopter one

Explanation:

it could be the bus one though

The magnitude of the acceleration of the body is approximately 1.802 m/s^2 when forces of magnitude 5 Newton and 4 Newton act on a body of mass 4.0 kg at a right angle to each other.

To determine the magnitude of the acceleration of a body when two forces act on it at a right angle, we can use the Pythagorean theorem and Newton's second law of motion.Newton's second law states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma). In this case, the net force is the vector sum of the two forces acting on the body.Using the Pythagorean theorem, we can find the magnitude of the net force. Let's call the force with magnitude 5 Newton as F1 and the force with magnitude 4 Newton as F2. The net force (Fnet) can be calculated as the square root of the sum of the squares of the individual forces: Fnet = sqrt(F1^2 + F2^2).Now we can substitute the net force into Newton's second law to find the acceleration (a). Rearranging the formula, we have a = Fnet / m.Plugging in the values, Fnet = sqrt(5^2 + 4^2) = sqrt(25 + 16) = sqrt(41) Newtons. The mass (m) is given as 4.0 kg.

Finally, the magnitude of the acceleration of the body is calculated as a = Fnet / m = sqrt(41) / 4.0 ≈ 1.802 m/s^2.

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Answer:

THIS IS THE ANSWER FOR THE ABOVE WRITTEN QUESTION

The resistance R of a wire is given by the formula:

R = (ρ × L) / A

where ρ is the resistivity of the material, L is the length of the wire, and A is the cross-sectional area of the wire.

We can rearrange this formula to solve for ρ:

ρ = (R × A) / L

Substituting the given values, we get:

ρ = (0.5 × 4×10^7) / 2

ρ = 1×10^7 ohm-meters

Therefore, the resistivity of the wire is 1×10^7 ohm-meters.

Answer:

C. Heavy

Explanation:

You need to be able to lift the bat.  

The net direction on the cart, if a person pulls on a cart to the right with a force of 10n and a second person pulls to the left with a force of 3n, is 7n to the right.

The net force direction can be determined by finding the net vector sum of the forces acting on it.

Since the first person pulled the cart to the right with a force of 10n,

Assuming the right direction as positive, this force can be represented as a vector ⇒(+)10n

Similarly, as the second person pulls the cart to the left, the force can be represented as a vector ⇒ (-)3n,

∴ Net force = Net vector sum of the forces

                   =(+10n) + (-3n)

⇒Net force = +7n

Thus, the net direction on the cart, if a person pulls on a cart to the right with a force of 10n and a second person pulls to the left with a force of 3n, is 7n to the right.

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Answer: 7n

Explanation:

Answer:

A

Explanation:

inertia Equation for All Object is k m R²

inertia Equation of Hollow Cylinder I = m R²

inertia Equation of Solid Cylinder I = ½ m R²

inertia Equation of Hollow Sphere I = ⅔ m R²

inertia Equation of Solid Sphere I = 2/5 m R²

to find the speed needed we can use Mechanical Energy (ME). or Total Energy.

ME = Translation Kinetic Energy + Rotation Kinetic Energi

ME = ½ m v² + ½ I w²

ME = ½ m v² (1 + k)

v² = 2ME / m(1+k)

sinnce all objects have the same mass, we can figure that v² is proportionally with 1/(1+k)

v²(hc) = 1/(1+1) = ½ = 0.5

v = 0.707

v²(sc) = 1/(1+½) = 2/3 = 0.67

v = 0.818

v²(hs) = 1/(1+⅔) = 3/5 = 0.6

v = 0.744

v²(ss) = 1/(1+²/5) = 5/7 = 0.71

v = 0.842

these is the ratio of speed they produce in the end of the arc with initial speed = 0 m/s

so, if we must give speed to the object so that it can reach the end of the arc, the fastest speed is given to hollow cylinder and the slowest speed is given to Solid Sphere

Then the answer is

HC, HS, SC, SS

Solid sphere, solid cylinder, hollow sphere, hollow cylinder  correctly lists the objects in order from fastest to slowest speed needed to make it through the arc.

A body's inertia is a characteristic that makes it resist attempts to move it or, if it is already moving, to change the speed or direction of it.

Mathematically:

inertia All Object is = k m R²

inertia of Hollow Cylinder I₁ = m R²

inertia of Solid Cylinder I₂ = ½ m R²

inertia of Hollow Sphere I₃ = ⅔ m R²

inertia of Solid Sphere I₄ = 2/5 m R²

Total kinetic energy of a body while it roll without slipping  = Translation Kinetic Energy + Rotation Kinetic Energi

= ½ m v² + ½ I w²

= ½ m v² (1 + k)

= 2 KE / m(1+k)

Since all objects have the same mass and, v² can be expressed as proportionally with 1/(1+k).

For hollow cylinder: v₁² = 1/(1+1) = ½ = 0.5

v₁ = 0.707

For solid cylinder: v₂²= 1/(1+½) = 2/3 = 0.67

v₂ = 0.818

For hollow sphere: v₃² = 1/(1+⅔) = 3/5 = 0.6

v₃ = 0.744

For solid sphere: v₄² = 1/(1+²/5) = 5/7 = 0.71

v ₄= 0.842

The objects in order from fastest to slowest speed needed to make it through the arc are correctly listed as:

solid sphere > solid cylinder > hollow sphere >  hollow cylinder.

Option (C) is correct.

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Answer:

To find the volume of a rectangular object, measure the length, width and height. Multiply the length times the width and multiply the result by the height. The result is the volume. Give the result in cubic units, such as cubic centimeters.

Explanation:

Answer:

Kinetic energy is the energy possessed by an object due to its motion. If an object is moving, then it has kinetic energy. The amount of kinetic energy depends on mass and speed.

Explanation:

The bike's velocity after 5.0 s when a motorcyclist of mass 60 kg rides a bike of mass 40 kg is 10m/s

Given mass of motorcyclist (m) = 60kg

mass of bike (m2) =40kg

Force exerted on bike (F) = 200N

Assuming that the total force on the bike remains constant.

Time taken (t) = 5s

Velocity of bike = v

We know that from newtons laws of motion F = Ma where a is the acceleration. v = u+at where u is the initial velocity = 0. Then a = v/t

So F = Mv/t

Here M be total mass = m1+m2

Then Fnet = (m1+m2) x v/t

v = F x t/(m1+m2) = 200 x 5/(40+60) = 10m/s

Hence Velocity of bike = 10m/s

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Answer:

7) Oven, toaster. 8) Fire, gas stove. 9) Television? No.. umm.. generator, yeah a generator 10) photosynthesis

Explanation:

Answer: The process of photosynthesis is broken up into two main groups of reactions: the "light reactions" which require light energy to operate, and the "Calvin cycle" which specifically takes carbon dioxide and turns it into organic molecules.

Explanation: Hope it helped you! :)

Answer:

In this case the net force is zero.

According to Newton's third law of motion: For every action, there is an equal and opposite reaction. In this case the net force is zero.

Explanation:

Hope this helps!! :)

The work done by the dog is 0.81J.

Work done is a measure of energy expended in moving an object; most commonly calculated by multiplying the force by the distance.

It is said that no work is done if the object does not move.

The work done on an object is the amount of energy transferred to an object through work.

According to this question, a dog lifts a 0.75 kg bone straight up through a distance of 0.11 m. The force applied to break the bone must be calculated first as follows:

Force = mass × acceleration

Force = 0.75kg × 9.8m/s²

Force = 7.35N

Work done = 7.35N × 0.11m = 0.81J

Therefore, 0.81J is the work done by the dog.

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Miranda, one of Uranus's moons, displays the widest range of surface terrains, suggesting some catastrophic disruption.

Miranda is the smallest and innermost of the five major moons of Uranus. It is known for its highly varied and fragmented surface, which indicates a history of intense geological activity.

The range of surface terrains observed on Miranda suggests that it has undergone significant cataclysmic disruptions in its past.

One prominent feature on Miranda is the "Coronae," which are large and distinct regions of tectonic activity. These coronae are characterized by parallel ridges and valleys that have been folded and deformed, indicating intense geological forces.

The presence of these coronae suggests that Miranda experienced extreme tectonic activity, likely as a result of past catastrophic disruptions.

Another noteworthy feature on Miranda is the "Verona Rupes," a massive cliff that reaches heights of up to 20 kilometers (12 miles). This cliff is one of the tallest known in the solar system, suggesting significant tectonic forces that may have caused the crust to crack and shift, resulting in such a dramatic geological feature.

The wide range of surface terrains observed on Miranda, including the presence of coronae and the massive Verona Rupes cliff, strongly indicates that this moon has experienced catastrophic disruptions in its past.

These disruptions likely involved intense tectonic activity, resulting in the deformation and fragmentation of Miranda's surface. The unique geological features on Miranda provide valuable insights into the complex history and dynamics of the Uranian moon system.

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The dryness fraction is 0.96. Using steam tables the enthalpies at points 2, 3, and 4 can be calculated as 2936.4 kJ/kg, 2892.3 kJ/kg, and 1039.2 kJ/kg, respectively. The value of q is found to be 1438.3 kJ/kg.

a) 0.2, b) 2687 kJ/kg, c) 0.16 kJ/kg.K, d) 32%, e) 2549.52 kJ/kgPart (a): The steam is superheated at 300°C and 3 MPa, using steam tables it can be seen that the dryness fraction is 0.96.Part (b): This can be calculated using the formula shown below. The net work done by the turbine is given as follows: Net work = m (h1 - h2) + m (h3 - h4) Where m is the mass of the steam entering the turbine and h1, h2, h3, and h4 are the enthalpies at the different points in the cycle.h1 is given as 3478 kJ/kg, and using steam tables the enthalpies at points 2, 3, and 4 can be calculated as 2936.4 kJ/kg, 2892.3 kJ/kg, and 1039.2 kJ/kg, respectively.

Substituting the values in the formula gives the answer as 2687 kJ/kg.Part (c): Heat transfer per unit mass of steam to the boiler can be calculated using the formula shown below:q = h1 - h4 The value of q is found to be 1438.3 kJ/kg. Part (d): The thermal efficiency of the cycle can be calculated using the formula shown below: Efficiency = Net work output/ Heat inputHeat input can be calculated as follows: Heat input = m (h1 - h4) + m (h3 - h2) The value of heat input is calculated to be 4485.4 kJ/kg Substituting the values in the formula gives the answer as 32%.Part (e): The heat transfer to cooling water passing through the condenser is given as follows:q = m (h4 - h5)Where h4 is 1039.2 kJ/kg and h5 is 48.72 kJ/kg. The value of q is calculated to be 2549.52 kJ/kg.

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The frequency of the wave would be approximately 3.125 Hz.

The frequency of a wave is the number of complete cycles or oscillations it completes in one second. the frequency (f) is the reciprocal of the period (T)  which is the time it takes for one complete cycle.

In this case  if the period is 0.32 seconds, the frequency would be:

f = 1 / T

f = 1 / 0.32

f ≈ 3.125 Hz

Therefore, the frequency of the wave would be approximately 3.125 Hz.

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The air mass would produce cold, dry weather in the winter is continental polar. The correct option is a.

A huge collection of air with evenly uniform degrees of temperature, humidity, and pressure.

Continental air masses which are formed cold and dry. Air mass that forms over northern Canada is known as continental polar air mass. As it moves to South, it brings dry weather like conditions in the United States.

Thus, the correct option is a.

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The outer planets are composed of c) rock and ice

The four outer planets - Jupiter, Saturn, Uranus, and Neptune - also called Jupiter or giant planets, are large celestial bodies with densities of less than 2 grams per cubic centimeter. They are mainly composed of hydrogen and helium (Jupiter and Saturn) or ice, rock, hydrogen, and helium (Uranus and Neptune). A planet's density depends on its composition. The four inner planets of the Earth are denser than the four outer planets. The inner planets are mostly composed of dense, hard rock. The outer planets are mostly gas, so they have a lower overall density. Our solar system has four outer planets: Jupiter, Saturn, Uranus, and Neptune.

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Answer:

See the explanation below.

Explanation:

Newton's third law states that any force applied to a body generates a reaction equal and in opposite direction to the original Force.

In order to better understand how a person's movement is generated when walking, we will analyze the attached image below, where we see the forces acting.

The red vector goes in the direction of the person's movement, this force vector pushes the person to move forward.

As the Sun continues to evolve over time, the habitable zone around it will also change. Currently, the habitable zone of the Sun is the region around it where conditions are just right to support liquid water on the surface of a planet.

However, this zone will not remain static in the future. As the Sun ages and evolves, it will gradually become brighter and hotter, causing the habitable zone to move outward from its current position.

This means that planets that are currently outside the habitable zone, like Mars, may eventually move into it and become habitable.

However, this outward movement of the habitable zone will not continue indefinitely. Eventually, the Sun will become a red giant, expanding to several times its current size.

At this point, the habitable zone will move inward towards the Sun, becoming much narrower than it is currently. Any planets that were previously in the habitable zone will be engulfed by the Sun's outer layers and destroyed.

Therefore, in the long term, the habitable zone around the Sun will first move outward and then inward, becoming both wider and narrower at different stages of the Sun's evolution.

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Answer:

They get it from the air and soil. They also take energy from the sun.

Explanation:

During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil.

Answer: Chlorophyll Breaking down.

Explanation: When it starts to get cooler the chlorophyll breaks down causing the pretty green color to change to brown gold and orange.

(a) The kinetic energy of the cart when it moves is 2/3 the way down is 1/3mgh.

(b) The total mechanical energy of the cart at the given height of 5 m is 5mg.

The potential energy of the cart when it is 2/3 way down the given height of 5 m is calculated as follows;

ΔP.E = mghf - mgh₀

ΔP.E = mg(hf - h₀)

ΔP.E = mg(2h/3 - h)

ΔP.E = -¹/₃mgh

ΔK.E = -ΔP.E

ΔK.E = ¹/₃mgh

M.A = P.E + K.E

M.A = ²/₃mgh + ¹/₃mgh

M.A = mgh

M.A = mg(5)

M.A = 5mg

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the magnetic field along the axis at the centre of the solenoid is approximately 5.47 × 10⁻⁴ T.

The magnetic field along the axis at the centre of a solenoid can be calculated using the formula:

B = μ₀nI

Where B is the magnetic field, μ₀ is the permeability of free space (4π × 10⁻⁷ T m/A), n is the number of turns per unit length (n = N/L), and I is the current.

In this case, the length of the solenoid is 99 cm, the radius is 3.14 cm, and the current is 3.05 A. So we can calculate the number of turns per unit length as:

n = N/L = 450/0.99 = 454.5 turns/m

Now we can substitute these values into the formula:

B = μ₀nI = (4π × 10⁻⁷ T m/A)(454.5 turns/m)(3.05 A) ≈ 5.47 × 10⁻⁴ T

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According to Law of Conservation of energy ,

One form of energy is transformed into another form of energy and there is no loss of energy in the transformation process.

The law of conservation of energy states that the energy can neither be created nor be destroyed only converted from one form of energy to the other form of energy means that the system always has the same amount of energy , unless its's added from the outside.

The only way to use energy is to transform energy from one form to another form.

example - Heat energy is transformed into Kinetic and Potential energy.

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The linear acceleration of the person's hand is given by:

a = (mg * r)/I.

The constant acceleration of a moving item travelling in a straight line is referred to as linear acceleration. It is described as the rate at which linear velocity changes in relation to time.

Since the cylinder is suspended in midair, the tension in the string equals the weight of the cylinder, which is given by:

T = mg

where m is the mass of the cylinder and g is the acceleration due to gravity.

The torque exerted by the tension on the cylinder is given by:

τ = Tr

where r is the radius of the cylinder.

Since the center of mass of the cylinder is not moving, the net torque on the cylinder must be zero. Therefore:

τ = Iα

where I is the moment of inertia of the cylinder and α is its angular acceleration.

Substituting the expressions for τ and T, we get:

Tr = Iα

Solving for α, we get:

α = Tr/I

The linear acceleration of the person's hand is equal to the product of the angular acceleration and the radius of the cylinder:

a = αr

Substituting the expressions for α and T, we get:

a = Tr/I * r = (mg * r)/I

Therefore, the linear acceleration of the person's hand is given by:

a = (mg * r)/I.

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Boyle's Law states that, at constant temperature, the pressure of a gas is inversely proportional to its volume. This law can be explained and understood using the kinetic-molecular theory of gases.

According to the kinetic-molecular theory, gases are composed of particles (atoms or molecules) that are in constant random motion. These particles collide with each other and with the walls of the container they are in. The pressure of a gas is the result of these collisions.

When the volume of a gas is decreased, the same number of gas particles are confined to a smaller space. As a result, the particles have less space to move around, and they collide more frequently with each other and with the walls of the container. The increased frequency of collisions leads to an increase in the pressure exerted by the gas.

Conversely, when the volume of a gas is increased, the gas particles have more space to move around, and they collide less frequently with each other and with the walls of the container. The decreased frequency of collisions leads to a decrease in the pressure exerted by the gas.

Therefore, according to the kinetic-molecular theory, as the volume of a gas decreases, the gas particles collide more frequently, resulting in an increase in pressure. This observation is consistent with Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume at constant temperature.

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Explanation:

The equation 2y = 8 sin (4πt) is a general equation for a particle vibrating in simple harmonic motion. The amplitude of the oscillations is given by the coefficient of the sine term, which is 8 in this equation. Therefore, the amplitude of the particle vibrating in simple harmonic motion is 8 cm.

The angular frequency is given by the coefficient of the variable t, which is 4π in this equation. Therefore, the angular frequency of the particle vibrating in simple harmonic motion is 4π rad/s.

Therefore, the answer is (b) 4 cm and 4π rad.

When an object is released with an initial velocity upward, the direction of its acceleration is typically downward.

This is because the force of gravity, which acts on the object, pulls it in the opposite direction to its motion. According to Newton's second law of motion, the net force on an object is equal to its mass multiplied by its acceleration. In this case, the force of gravity acts as the net force, causing the object to accelerate downward.

The acceleration due to gravity is approximately 9.8 meters per second squared on Earth, and it acts downward towards the center of the planet. Therefore, when the object is released with an initial velocity upward, the gravitational force causes it to decelerate and eventually change direction, resulting in a downward acceleration. This downward acceleration opposes the initial upward velocity of the object until it eventually reaches its peak and starts to fall back down under the influence of gravity.

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