a copper cable is designed to carry a current of 240 a with a power loss of 2.20 w/m. what is the required radius of this cable?

When a ferromagnetic material is placed in an electromagnetic coil and a magnetic field is applied, the magnetic induction (B) is increased.

Therefore, the correct answer is:

(a) There is a large increase in the magnetic induction (B)

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Explanation:

As a tornado or other storm system passes over a building, low pressure can tug a roof upward. When those forces surpass the force exerted by the weight of the roof, the structure flies up and is swept away by wind currents..

Answer:

the time between successive meridian transits of the sum at a particular place

1) The number of photons in each beam is what determines the amount of energy each beam carries. A beam of red light contains more photons than a beam of blue light, but each photon in the blue beam carries more energy than each photon in the red beam. Therefore, the two beams can carry the same amount of energy despite having different energies per photon.

2) Reflecting telescopes have two advantages over refractors. They are cheaper to manufacture, and they do not suffer from chromatic aberration.

3) Refraction is the bending of light as it passes from one medium to another. Refraction occurs because light waves travel at different speeds through different materials. The amount of refraction depends on the angle at which the light passes through the medium.

4) The image of a star is larger in the focal plane of the larger telescope. This is because the larger telescope collects more light than the smaller telescope, which means that the image is brighter and has a higher signal-to-noise ratio.

5) Quantum efficiency is a measure of how efficiently a detector converts incoming photons into electrical signals. A higher quantum efficiency means that more of the incoming

photons are detected, which makes it easier to detect faint astronomical objects.

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1) The number of photons in each beam is what determines the amount of energy each beam carries.

2) Reflecting telescopes have two advantages over refractors.

3) Refraction is the bending of light as it passes from one medium to another.

4) The image of a star is larger in the focal plane of the larger telescope.

5) Quantum efficiency is a measure of how efficiently a detector converts incoming photons into electrical signals.

1) The number of photons in each beam is what determines the amount of energy each beam carries. A beam of red light contains more photons than a beam of blue light, but each photon in the blue beam carries more energy than each photon in the red beam. Therefore, the two beams can carry the same amount of energy despite having different energies per photon.

2) Reflecting telescopes have two advantages over refractors. They are cheaper to manufacture, and they do not suffer from chromatic aberration.

3) Refraction is the bending of light as it passes from one medium to another. Refraction occurs because light waves travel at different speeds through different materials. The amount of refraction depends on the angle at which the light passes through the medium.

4) The image of a star is larger in the focal plane of the larger telescope. This is because the larger telescope collects more light than the smaller telescope, which means that the image is brighter and has a higher signal-to-noise ratio.

5) Quantum efficiency is a measure of how efficiently a detector converts incoming photons into electrical signals. A higher quantum efficiency means that more of the incoming

photons are detected, which makes it easier to detect faint astronomical objects.

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The centerline velocity decays as a power law with a decay exponent of approximately 0.5, while the half-angle spread rate follows a power law with an exponent of approximately 0.5 and a constant that depends on the Reynolds number. Based on the plot provided, the half-angle spread rate is approximately 0.13 radians or 7.5 degrees.

In a self-preserving or self-similar jet flow, the centerline decay and half-angle spread rate are related to the jet Reynolds number (Re) and the distance from the jet source (x/D).

Assuming that the question is referring to a typical turbulent jet flow, the centerline decay follows a power-law relationship of the form:

u/U_max = (x/D)^-n

where u/U_max is the normalized centerline velocity, x/D is the normalized distance from the jet source, and n is a decay exponent that depends on the Reynolds number.

For a jet with a Reynolds number in the range of 10^4 to 10^6, the decay exponent is approximately n = 0.5, which means that the centerline velocity decreases as the square root of the distance from the jet source.

As for the half-angle spread rate, it also depends on the Reynolds number and the distance from the jet source. In a self-preserving jet flow, the half-angle spread rate is typically constant along the jet centerline and can be approximated by:

θ = k*(x/D)^-m

where θ is the half-angle spread rate, k is a constant that depends on the Reynolds number, and m is an exponent that is approximately equal to 0.5 for a turbulent jet flow.

It is not possible to determine the exact values of the centerline decay or the half-angle spread rate without additional information or measurements. However, the plot does show that the half-velocity points are located at approximately x/D = 7 and x/D = 3 on the positive x-axis, which suggests that the half-angle spread rate is approximately:

θ ≈ (1/4)*(tan^-1(1/3) - tan^-1(1/7)) ≈ 0.13 radians or 7.5 degrees

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____The given question is incomplete, the complete question is given below:

This question requires knowledge about free jet flow labs using a pitot tube.

By rounding to the nearest integer digit, state how the centerline of a jet decays and the half angle spread rate of a jet. All jets flowing into the same fluid as the jet have this same spread rate and decay. This behavior is called self-preserving or self-similar and is shown by the plot made in Task 3c. HALF VELOCITY AND DOWNSTREAM LOCATION POINTS 00 7 6 Сл Y POSITION X/D=20 3 -X/D=30 2 -X/D=40 1 0 0 20 40 60 80 100 X POSITION

Answer:

5m

Explanation:

Given parameters:

Work done in lifting the box  = 50J

Force applied  = 10N

Unknown:

Height of lifting the box  = ?

Solution:

Work done is the produce of force and distance;

      Work done  = Force x distance

Now to find the height;

  Work done  = Force  x height;

   50  = 10 x h

         h  = 5m

The time taken to cover a distance is the distance divided by velocity. The alligator will take 20.8 seconds to crawl 25 m with a velocity of 1.2 m/s.

Velocity of an object is the measure of the distance covered by it per unit time. It is the rate of its speed. Velocity is a vector quantity thus, having magnitude and direction.

The higher the velocity, greater will be the distance covered within short time. Velocity is the ratio of change in distance to the change in time. It has the common unit of m/s.

Given that, distance covered by the alligator  = 25 m

velocity = 1.2 m/s

then time  = distance / velocity

t = 25 m/ 1.2 m/s = 20.8 s.

Therefore, the alligator crawls 20.8 seconds to reach 25 m.

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Tony will run at least 9 additional miles to meet the requirement of running at least 26 miles this week. The possible numbers of additional miles he can run are 9 or any value greater than 9.

To determine the possible numbers of additional miles Tony will run, we need to find the range of values that satisfy the condition "Tony will run at least 26 miles this week" given that he has already run 17 miles.

Let's denote the additional miles Tony will run as "x." According to the given information, we have the following inequality:

17 + x ≥ 26

To find the range of values for x, we can solve this inequality:

x ≥ 26 - 17

x ≥ 9

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The total momentum is Mv and the total kinetic energy is ½ Mv². Therefore, option E is correct.

In an elastic collision, the total momentum and the total kinetic energy are conserved.

Before the collision:

After the collision, since the collision is elastic:

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Answer:

the temperature in the troposphere decreases while the temperature in the stratosphere increases because of the density of air molecules.

Explanation:

sorry ima little late

Answer:

using V= IR

I= 11Ampere

The advantage of having a blowhole on top of a dolphin's head is that it allows them to breathe while swimming without having to break the surface of the water, which is crucial for their survival.

Dolphins are aquatic mammals and need to breathe air to survive. The location of their blowhole on the top of their head allows them to take in air without having to break the surface of the water, which is critical for their survival in the wild. When a dolphin needs to breathe, it can simply surface and quickly exhale and inhale through its blowhole.

This enables them to maintain a constant speed while swimming, and also helps them avoid detection from predators or prey that may be lurking at the surface. In addition, having a blowhole on top of their head allows them to quickly clear their airways of water and mucus, which can be useful for diving and hunting.

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Answer:

P = 0

Explanation:

Momentum is defined as the quentity of motion contained in a body. Mathematically, it can be defined as the product of mass and velocity. So, in order to determine the Volkswagen Beetle, at rest, we can use the simple formula, as follows:

\(P = mv\)

where,

P = Momentum of Volkswagen Beetle = ?

m = Mass of Volkswagen Beetle = 750 kg

v = Velocity of Volkswagen Beetle = 0 m/s (since, it is at rest)

Therefore,

\(P=(750)(0)\)

P = 0

Answer:

it will more and change direction

Explanation:

because the resultant force (R) is not equal zero so may be there is a force greater than the other one and the ball will more in the direction of greater force.

and it can't be remain stationary because R=! 0 .

Answer:

Wholesale Market. 1. The market for the sale of goods to a retailer. That is, a wholesaler receives large quantities of goods from a manufacturer and distributes them to stores, where they are sold to consumers. ... The market for the sale of securities to institutional investors rather than individuals.

By utilizing a funnel filter made of Sodium chloride salt as a filtration method. The organic solvent will be evaporated using the rotary evaporation method, leaving the sucrose behind.

All plants naturally generate sugar, the well-known and adored simple carbohydrate, also called by its chemical formula, sucrose. This includes fruits, veggies, and even nuts. Plants including berries, vegetables, and nuts naturally contain sugars like glucose in various amounts. Sucrose is also commercially generated from sugar cane and beets.

According to a research, ingesting "natural" sugar might be just as bad for your health as consuming high- fructose corn syrup. Sucrose, a carbohydrate, provides the energy your body needs to perform both mental and physical work. Your body converts foods like starch and sucrose into glucose and fructose during digestion. Your body breaks down food to provide your cells energy. Reduce the fructose and glucose down.

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Water freezes more quickly when it is exposed to colder temperatures and when it is in a container with a large surface area, which allows for faster heat transfer.

Water freezes at 32 degrees Fahrenheit (0 degrees Celsius). The time it takes for water to freeze at this temperature depends on several factors such as the volume of water, the container it is in, and the environment in which it is located.

Assuming that the water is in a typical home freezer and the volume of water is not too large, it would typically take several hours for the water to freeze completely. The exact amount of time it takes for the water to freeze would depend on the volume of water and the temperature of the freezer.

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(a) The thermal efficiency of the Carnot cycle is 56.9%. (b) The temperature of the source is 417°C.

The efficiency of a Carnot cycle is given by η = 1 - Tc/Th, where Tc and Th are the temperatures of the cold and hot reservoirs, respectively. We can use the fact that the Carnot cycle is reversible and the conservation of energy to find the unknown temperatures.

(a) The efficiency of the Carnot cycle is given by η = (Qh - Qc)/Qh, where Qh is the heat absorbed from the hot reservoir and Qc is the heat rejected to the cold reservoir. Substituting the given values, we get η = (650 kJ - 250 kJ)/650 kJ = 0.569 or 56.9%.

(b) We can use the equation for the efficiency of the Carnot cycle to solve for Th. Rearranging the equation, we get Th = Qh/(1 - η). Substituting the given values, we get Th = (650 kJ)/(1 - 0.569) = 1500 K. Converting to Celsius, we get Th = 1500 - 273 = 1227°C.

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An unknown-temperature heat source provides 650 kJ of heat to a Carnot heat engine, while the engine releases 250 kJ of heat to a sink at a temperature of 24°C.

To solve this problem, we can use the Carnot efficiency formula:

(a) The thermal efficiency (η) of a Carnot heat engine is given by the equation:

η = \(1 - \left(\frac{T_{\text{cold}}}{T_{\text{hot}}}\right)\)

where \(T_{\text{cold}}\) is the temperature of the sink and \(T_{\text{hot}}\) is the temperature of the source.

Given:

Heat received \((Q_{\text{hot}})\) = 650 kJ

Heat rejected \((Q_{\text{cold}})\) = 250 kJ

Temperature of the sink \((T_{\text{cold}})\) = 24°C = 24 + 273 = 297 K

We need to find the temperature of the source (\(T_{\text{hot}}\)).

First, we need to calculate the efficiency using the given values:

η = \(1 - \frac{T_{\text{cold}}}{T_{\text{hot}}}\)

Substituting the known values:

η = \(1 - \frac{297 , \text{K}}{T_{\text{hot}}}\)

Now, let's rearrange the equation to solve for \(T_{\text{hot}}\):

\(1 - \frac{297}{T_{\text{hot}}}\)

\(1 - \eta = \frac{297}{T_{\text{hot}}}\)

\(T_{\text{hot}} = \frac{297}{1 - \eta}\)

(b) Now, we can substitute the efficiency (η) value into the equation to find the temperature of the source:

\(T_{\text{hot}} = \frac{297}{1 - \eta}\)

\(T_{\text{hot}} = \frac{297}{1 - \left(\frac{Q_{\text{cold}}}{Q_{\text{hot}}}\right)}\)

Substituting the known values:

\(T_{\text{hot}} = \frac{297}{1 - \left(\frac{250 , \text{kJ}}{650 , \text{kJ}}\right)}\)

\(T_{\text{hot}} = \frac{297}{1 - 0.3846}\)

\(T_{\text{hot}} = \frac{297}{0.6154}\)

T_hot ≈ 482.35 K

Therefore, the thermal efficiency of the Carnot cycle is approximately 38.46%, and the temperature of the source is approximately 482.35 K.

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Answer:

The required answer is 35100

Answer:

35100mg

Explanation: When converting bigger to smaller units, we move the decimal point to the right side. As there are 6 zeroes, The decimal point will move six places to the right. Therefore answer id 35100mg

Which is the force that would be transmitted to his leg bones if we assume that they can withstand a stress of 150 MPa (which is a typical value for bone strength). The correct answer is therefore B. 346 N.

To solve this problem, we can use the formula F = m * a, where F is the force, m is the mass, and a is the acceleration. We can calculate the acceleration using the formula a = Δv / Δt, where Δv is the change in velocity (in this case, the velocity goes from downward to zero), and Δt is the time it takes for the change to occur.

Δv = 0 - (-sqrt(2 * g * h)) = sqrt(2 * 9.81 m/s^2 * 1.70 m) = 5.24 m/s

Δt = 0.025 s

a = Δv / Δt = 5.24 m/s / 0.025 s = 209.6 m/s^2

Now we can plug in the values for F and m:

F = m * a = 60.0 kg * 209.6 m/s^2 = 12,576 N

However, this is the force that would be transmitted to the leg bones if the man's knees were bent. Since he forgot to bend his knees, the force is spread over a smaller area (the bones in his legs instead of his muscles and joints). This means that the actual force transmitted to his leg bones will be higher. The correct answer is therefore B. 346 N, which is the force that would be transmitted to his leg bones if we assume that they can withstand a stress of 150 MPa (which is a typical value for bone strength).

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About half of the gas and dust that fills interstellar space is concentrated in dense regions called molecular clouds.

Interstellar space is not completely empty but contains gas and dust spread throughout. Molecular clouds are regions within interstellar space where the gas and dust are highly concentrated. These clouds are composed mainly of molecular hydrogen (H₂) along with other molecules like carbon monoxide (CO) and various organic compounds.

Molecular clouds are dense and cold regions that serve as the birthplaces of stars. Within these clouds, gravity causes the gas and dust to clump together, forming denser regions known as molecular cloud cores. These cores can further collapse under their own gravity, leading to the formation of protostars and ultimately stellar systems.

The presence of dense molecular clouds is crucial for the process of star formation and the evolution of galaxies. They provide the necessary raw materials from which new stars and planetary systems can emerge, making them important objects of study in astronomy and astrophysics.

Therefore, approximately 50% of the gas and dust in interstellar space is found in concentrated areas known as molecular clouds, which play a vital role in star formation and galactic evolution

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Answer:

Crumple Zones are parts of a car that are designed to deform and absorb large amounts of energy from car collisions and impacts. This helps reduce the force that acts on the driver in a car accident [1]. 2: Newton's Second Law states that Force= Mass x Acceleration

Explanation:

Answer:different parallel, straight paths. Each car's velocity as a function of time is shown in the graph. Which of the following claims is correct

about car X and car Y?

Both car X and car Y travel in the same direction.

Explanation:

Answer: Is the atomic theory still valid today?

Although two centuries old, Dalton's atomic theory remains valid in modern chemical thought. 1) All matter is made of atoms. Atoms are indivisible and indestructible. 3) Compounds are formed by a combination of two or more different kinds of atoms.

Explanation: hope this helps!!!

Answer:

small amounts of mass are converted to large amounts of energy

Explanation:

According to the mass-energy equivalence, which Albert Einstein initially proposed as a general principle. It was revealed that mass and energy are connected and that a "small amount of mass can be converted into enormous amounts of energy."

Using the formula E=mc^2. This means Energy equals mass times the speed of light squared.

Hence, it is true that "small amounts of mass are converted to large amounts of energy."

Answer:

Vibration means quickly moving back and forth (or up and down) about a point of equilibrium. ... Something that is vibrating may shake at the same time. If it vibrates in a regular way, it may produce a musical note because it can make the air vibrate. This vibration will send sound waves to the ear and to the brain.

Explanation:

Vibration, periodic back-and-forth motion of the particles of an elastic body or medium, commonly resulting when almost any physical system is displaced from its equilibrium condition and allowed to respond to the forces that tend to restore equilibrium.

The mass of an atom is less than the sum of the masses of its component protons, neutrons and electrons. The mass defect is 0.0423 amu. The correct option is B.

The mass defect is equal to the mass lost as an equivalent amount of energy during the formation of a given nucleus from the component nucleons.

Δm = M°- M

Δm = Mass defect

M° = Expected total mass

M = Experimentally determined mass

Here 'Li' has 3 protons and 4 neutrons.

The mass of proton = 3 × 1.0073 = 3.0219 amu

The mass of neutron = 4 × 1.0087 = 4.0348 amu

The sum of masses of protons and neutrons = 7.0567

Mass defect = 7.0567 - 7.0144 = 0.0423 amu

Thus the correct option is B.

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Answer:

Explanation:

Forensic techniques such as bite mark analysis, blood spatter analysis, ballistic analysis, the matching of bullet casings to a gun, the matching of hair and fibers, and fingerprint analysis. All of these have come under fire which have not being as scientific as presumed.

The given problem involves calculating the definite integral of a function f(x) over a specific range. The function f(x) is defined differently for different values of x, and the final result of the definite integral \(1^2\)₁ f(x) dx, where x ≤ n, is -cos(n) - (-cos(1)) + 3cos(T) - 3cos(n) + infinity.

To calculate the definite integral 1²₁ f(x) dx, where x ≤ n, we need to evaluate the integral of the given function f(x) over the specified range. The function f(x) has different definitions depending on the value of x. For x ≤ n, the function is sin(x), and for x > n, the function is -3sin(x). Additionally, the function is defined as 2x for values of x greater than a certain threshold T.

To solve this problem, we need to consider the different intervals of the range separately. First, we integrate sin(x) over the interval 1 to n. The integral of sin(x) is -cos(x), so the value of this part of the integral becomes -cos(n) - (-cos(1)).

Next, we need to integrate -3sin(x) over the interval n to T. The integral of -3sin(x) is 3cos(x), so this part of the integral becomes 3cos(T) - 3cos(n).

Lastly, we integrate 2x over the interval T to infinity. The integral of 2x is \(x^2\), so this part of the integral becomes infinity.

Combining these three parts, the final result of the definite integral \(1^2\)₁ f(x) dx, where x ≤ n, is -cos(n) - (-cos(1)) + 3cos(T) - 3cos(n) + infinity.

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