currents in dc transmission lines can be 100 aa or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers.
a. For a line that has current 180 A and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level?
b. What magnetic field does the line produce at ground level as a percent of the earth's magnetic field. which is 0.50 G.
c. Is this value of magnetic field cause for worry?

Answer:

Explanation:

actually , the acceleration due to gravity depends on the distance from it's center of the earth.

when the distance from the earth increases , the acceleration due to gravity decreases as a result . The value of gravity in space is zero.

Answer:

1000 meters, 200 meters

Explanation:

Given: Vi = 100 m/s and a = -5 m/s^2

From uniformly accelerated equation:  v = Vi + a t

then substitute

0 = 100 -5 t

t = 20 seconds

to go from 100 to 0 at -5m/s^2

d = Vi (20) - (1/2)(5)(20)^2

d = 100 (20) - 2.5(400)

= 2000 - 1000

= 1000 meters to stop, runs 200 meters beyond the end of the runway into the harbor where he strikes a passenger ferry.

Explanation:

weight of the piano = mg

w = 99 x 10 =990 N

Answer:

Group 18

Explanation:

Answer:

gold

Explanation:

gold is shinny and solid can conduct ele tricity ,maleabl

Answer:

The answer is 8.0 J.

Answer:

Explanation:

The answer is A :)

have a nice day

Answer:

The length of the third side is

     \(c =8.82 \  m \)

The tangent of the angle for which 6.9 m is the opposite side is

\(k = 1.256\)

Explanation:

From the question we are told that

The first side is a = 6.9 m

The second side is b = 5.5 m

Generally apply Pythagoras theorem

\(c^2 = a^2 + b^2\)

=> \(c = \sqrt{a^2 + b^2 }\)

=> \(c = \sqrt{6.9^2 + 5.5^2 }\)

=> \(c =8.82 \ m \)

From sin rule we have that

\(\frac{c}{sin(\theta )} = \frac{a}{sin (\beta )}\)

Generally from a right triangle the angle \(\theta = 90\)

So

\(\frac{8.82}{sin(90 )} = \frac{6.9}{sin (\beta )}\)

=> \(\beta = sin ^{-1}[\frac{6.9}{8.82} ]\)

=> \(\beta =51.47^o\)

Generally the tangent of the angle for which 6.9 m is the opposite side is mathematically represented as

\(k = tan (\beta )\)

       \(k  =  tan (51.47 )\)

       \(k  = 1.256\)

The terminals of a\(12\) v battery are connected by a \(1.0-mm\) diameter copper wire. The wire needs to be \(7.2\) km in length in order to have a current of 10 A.

Copper wire is a type of electrical wiring used in the construction of buildings and other structures. It is made of highly conductive copper, a material that is strong and durable enough to withstand the rigors of everyday use. Copper wires are typically covered with a protective sheath of insulation to protect them from electric shock, corrosion, and other environmental hazards. Copper wires are used in a variety of applications, including telecommunications, power generation, distribution, and control systems.

The length of the wire can be determined using Ohm's Law. This states that the current through a wire is equal to the voltage across the wire divided by the resistance of the wire. Therefore, the length of the wire needed to achieve a current of 10 A is:

Length =\((12 V)/(10 A x 1.0 mm2/m x 1.68 x 10-8 Ω /m)\) = \(7.2\) km.

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Answer:

b. between 2 s and 4 s

Explanation:

2-4 was both 3m/s

Answer:

Reflected

Explanation:

During the process of reflection whatever that is sent forth e.g light comes back (reflects)

Answer:

transmitted

Explanation:

took quiz

The statement is not true about a distance-versus-time graph the slope of the line represents the speed of the object. Option B.

A distance versus time graph shows how far an object has traveled over a period of time. This is a simple line chart that displays distance vs. time results in a graph. Distance is plotted on the Y-axis. Time is plotted on the x-axis. A distance-time diagram of uniform travel in one dimension means that equal distances are covered in equal time intervals.

On a graph of distance versus time, a sloping line indicates that the object is in motion. The slope or slope of the line in the displacement versus time graph corresponds to the object's velocity. body at rest. A distance versus time graph shows how far an object has traveled over a period of time. The diagram above shows a body at rest. This is because the distance does not change over time.

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Answer:

a = 0.45 m/s²

Explanation:

The given question is ''Calculate the acceleration that produces a force of 40 N on a body with 88 kg of mass".

Given that,

Force, F = 40 N

Mass of the body, m = 88 kg

The net force acting on the body is given by :

F = ma

Where

a is the acceleration of the body

\(a=\dfrac{F}{m}\\\\a=\dfrac{40\ N}{88\ kg}\\\\a=0.45\ m/s^2\)

So, the required acceleration is 0.45 m/s².

The force of friction acting on him is 122 N. The correct answer is option C

Friction is a force that opposes the motion of a static or a moving object.

Given that Barry slides across an icy pond. The coefficient of kinetic friction between his shoes and the ice is 0.15. If his mass is 83 kg

The given parameters are;

The normal reaction N on the body = mg

N = 83 x 9.8

N = 813.4 N

The Frictional force formula is  \(F_{r}\) = μN

\(F_{r}\) = 0.15 x 813.4

\(F_{r}\) = 122.01 N

Therefore, the force of friction acting on him is 122 N approximately.

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A promising evidence of a habitat that might support life on the planet Mars is water.

There is evidence supporting the existence of liquid water on Mars from numerous sources. The finding of repeated black streaks on Martian slopes and the presence of hydrated minerals suggest the potential of seasonal or location-specific briny water flows. A necessary component of life as known is liquid water.

Additionally, Mars possesses underground ecosystems that could provide defence against radiation and severe surface conditions. Researchers have found evidence of ancient underground hydrothermal systems as well as beneath ice. These settings might offer consistent conditions for the development of microbial life.  Methane gas has been found in the Martian atmosphere, along with variations over time, and this has led to questions regarding its origin. Both geological and biological processes can result in the production of methane.

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The magnetic moment of a current distribution can be calculated by multiplying the current flowing through the loop by the area enclosed by the loop. In this case, for a pipe made of a superconducting material with a given length, radius, and uniformly distributed current of 3.4 x 10^3 A, the magnetic moment can be determined.

The magnetic moment of a current distribution is a measure of its magnetic strength. It can be calculated by multiplying the current flowing through the loop by the area enclosed by the loop.

In this scenario, the current flowing around the surface of the pipe is uniformly distributed. To calculate the magnetic moment, we need to determine the area enclosed by the current loop. For a cylindrical pipe, the enclosed area can be approximated as the product of the length of the pipe and the circumference of the circular cross-section.

Given that the length of the pipe is 0.36 m and the radius is 3.5 cm (or 0.035 m), the circumference of the cross-section can be calculated as 2πr, where r is the radius. Thus, the area enclosed by the loop is approximately 2πr multiplied by the length of the pipe.

Using the given values, the area enclosed by the loop is approximately 2π(0.035 m)(0.36 m).

Finally, to determine the magnetic moment, we multiply the current flowing through the loop by the area enclosed. Using the given current of 3.4 x 10^3 A, the magnetic moment can be calculated as 3.4 x 10^3 A multiplied by 2π(0.035 m)(0.36 m).

Calculating this expression will yield the value of the magnetic moment for the given current distribution in the superconducting pipe.

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Given that the trench is 11.0 km deep and that saltwater has a constant density of 1029 kg/m3 throughout, the gauge pressure (in atm) due to the ocean at the bottom of the trench is 992.38 atm.

It is positive for pressures above atmospheric pressure and negative for pressures below atmospheric pressure; gauge pressure is the pressure as compared to atmospheric pressure. Any fluid that is not contained has its pressure increased by the atmospheric pressure. Density is defined as the ratio of mass to volume, or mass per unit volume. It is a way to quantify how much "stuff" an object has in relation to its volume (cubic metre or cubic centimeter). In essence, density is a measurement of how closely stuff is packed together.

P = 100552500/101325

P = 992.38atm

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The correct answer to what is the slowest speed with which the ball can leave your golf club if you wish to make a hole in one is 2.9 m/s.

To make a hole in one, the ball must have enough speed to reach the hole. The slowest speed that the ball can leave the golf club is the minimum speed required to reach the hole. We can use the equations of motion to find the minimum speed required.

First, let's find the time it takes for the ball to reach the slope. The distance from the golf club to the slope is 2.0 m, and the deceleration is 1.0 m/s^2. Using the equation d = v_0*t - (1/2)*a*t^2, we can solve for t:

2.0 = v_0*t - (1/2)*1.0*t^2

Rearranging and using the quadratic formula, we get:

t = (v_0 ± √(v_0^2 - 4*(1/2)*(-2.0)))/(2*(1/2))

t = (v_0 ± √(v_0^2 + 4.0))/1.0

Since we are looking for the minimum speed, we will use the smaller value of t:

t = (v_0 - √(v_0^2 + 4.0))/1.0

Next, we can find the time it takes for the ball to reach the hole on the slope. The distance on the slope is 1.5 m, and the deceleration is 6.0 m/s^2. Using the same equation of motion, we can solve for t:

1.5 = v_0*t - (1/2)*6.0*t^2

Rearranging and using the quadratic formula, we get:

t = (v_0 ± √(v_0^2 - 4*(1/2)*(-1.5)*6.0))/(2*(1/2)*6.0)

t = (v_0 ± √(v_0^2 + 18.0))/6.0

Again, we will use the smaller value of t:

t = (v_0 - √(v_0^2 + 18.0))/6.0

Now we can set the two values of t equal to each other and solve for v_0:

(v_0 - √(v_0^2 + 4.0))/1.0 = (v_0 - √(v_0^2 + 18.0))/6.0

Cross-multiplying and rearranging, we get:

5.0*v_0 = √(v_0^2 + 18.0) - √(v_0^2 + 4.0)

Squaring both sides and simplifying, we get:

v_0^2 - 10.0*v_0 + 14.0 = 0

Using the quadratic formula, we get:

v_0 = (10.0 ± √(10.0^2 - 4*1.0*14.0))/(2*1.0)

v_0 = (10.0 ± √(100.0 - 56.0))/2.0

v_0 = (10.0 ± √44.0)/2.0

Again, we will use the smaller value of v_0:

v_0 = (10.0 - √44.0)/2.0

v_0 ≈ 2.9 m/s

Therefore, the slowest speed with which the ball can leave the golf club is 2.9 m/s.

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Answer:

two protons and two neutrons

it's the answer. hope it helps

Alpha particles have two protons and two neutrons. Therefore, option (D) is correct.

Alpha particles can be defined as positively charged particles released from the decay of several radioactive materials. The mass of the Alpha particle is because of the presence of two protons and two neutrons. Therefore, the Alpha particles nucleus is very similar to the nucleus of the Helium atom and are denoted by the Greek alphabet α.

An alpha particle or ray is also known as doubly ionized helium nuclei (He²⁺). The alpha particle's mass is equal to 6.64 × 10⁻²⁷ Kg. Alpha particles are generally generated during the standard radioactive decay of atomic nuclei.

Alpha particles contains the kinetic energy of 5MeV and a speed of 5 % of that of the speed of light. They are also formed in high-energy particle accelerators and are highly ionized particles with low penetration depth compared to other particles.

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To find the acceleration components from magnitude and angle, you can use the following equations ax = a * cos(θ) and ay = a * sin(θ)

The acceleration components from magnitude and angle:

Where ax and ay are the x and y components of the acceleration, a is the magnitude of the acceleration, and θ is the angle.
By plugging in the values for magnitude and angle into these equations, you can find the acceleration components in the x and y directions.

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at a temperature of 2.41 K, the rms speed of oxygen molecules would be approximately 1000 m/s.

What is Temperature?

Temperature is a measure of the average kinetic energy of the particles in a system. It is commonly measured in degrees Celsius (°C) or Fahrenheit (°F), or in the Kelvin (K) scale, which is based on the theoretical lowest possible temperature, known as absolute zero. Temperature is a fundamental concept in thermodynamics.

For oxygen molecules, m = 5.312 × \(10^{-26}\) kg, and k = 1.38 × \(10^{-23\) J/K. We need to find the temperature T at which the rms speed of oxygen molecules is given.

Rearranging the above equation, we have:

T = (\(m * v_rms^{2}\)) / (3k)

Substituting the given values, we get:

T = (5.312 × \(10^{-26}\)) \(kg * v_rms^{2}\)) / (3 * 1.38 × \(10^{-23\) J/K)

We need to solve for T when v_rms = ?

Since the temperature at which the rms speed is required is not given, we can assume any value of v_rms and find the corresponding temperature. For example, if we assume v_rms = 1000 m/s, we get:

T = (5.312 × \(10^{-26}\)) kg *\((1000 m/s)^{2}\) / (3 * 1.38 × \(10^{-23\)) J/K) = 2.41 K

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Answer:

B

Explanation:

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 6 × 3

We have the final answer as

Hope this helps you

Hi! Let's see.

Explanation:

Data:

==================================================================

We apply the distance formula:

We replace by the data:

It divides:

Answer: The distance is 15 meters.

Cordially Alejanndraax. Greetings!

The distance covered by the machine is 15 m.

Work done on an object is defined as the dot product of the force applied on the object and the displacement of the object.

Here,

Amount of work done by the machine, W = 12000 J

Force exerted on the machine, F = 800 N

The equation for work done,

W = F.s

Therefore, displacement,

s = W/F

s = 12000/800

s = 15 m

Hence,

The distance covered by the machine is 15 m.

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Answer: C

Explanation: I just finished the test on A P E X :)

Planets A and B have the same mass, but planet A is half the size of planet B, hence you would weigh more on planet A because the distance between you and the planet's center of gravity would be smaller, so option C is correct.

A fundamental characteristic of an object, its inertia is quantified by its mass, which is a basic indicator of the volume of substance inside the thing. Because mass is such a fundamental quantity and is difficult to define in terms of another, definitions of it frequently appear circular.

It is possible to define every mechanical quantity in terms of mass, length, and time. The SI unit for mass, denoted by the letter m, is the kilogram. While mass is typically thought of as an immutable feature of an item, relativistic mass must be taken into account when traveling at speeds close to the speed of light.

Therefore, You would weigh more on planet A because the distance between you and the planet's center of gravity would be smaller.

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Answer:

Isn't it technically your brain? Because it's always in your skull and when you're younger you have cracks in your skull but as you grow, your skull fossilizes to mend those cracks. IT FOSSILIZES!

Explanation:

Answer:

the force would increase 4 times more

Explanation

more force results more mass or acceleration

Answer:

it would grow by 4x

Explanation:

Answer:

I think its the helicopter one

Explanation:

it could be the bus one though

The development of our current model of the atom evolved over centuries, starting with the ancient Greeks' conceptualization of the atom as an indivisible particle.

Around the fifth century BCE, the Greeks became the first people to put forth the idea of the atom. Democritus and other philosophers proposed the idea that matter is made up of tiny, indivisible pieces called atoms, but there was no experimental support for this theory at the time. Although it survived for centuries, this idea did not significantly change until the 19th century.

Scientific developments in the 19th century led to a deeper comprehension of atoms. With notable contributions from Michael Faraday's work on electromagnetic induction and Benjamin Franklin's electricity tests, scientists discovered the presence of electrical charges.

Groundbreaking investigations that transformed our understanding of the atom took place in the early 20th century. The electron, a negatively charged particle inside the atom, was discovered in 1897 as a result of J.J. Thomson's cathode ray tube studies. Atoms are shown to have a small, dense, positively charged nucleus that is around by negatively charged electrons in a large empty region by Ernest Rutherford's gold foil experiment in 1911.

The Rutherford model, sometimes known as the planetary model, was created in response to the discovery of the nucleus. This model, however, encountered problems since it was unable to explain the stability of atoms and the behavior of electrons. Researchers like Werner Heisenberg and Erwin Schrödinger made significant contributions to the development of quantum mechanics in the 1920s and 1930s.

The wave-particle duality and quantum mechanical concepts are both included in the current model of the atom, also referred to as the quantum mechanical model. In orbitals, which are areas of probability where electrons are most likely to be located, it says that electrons exist. Around the nucleus, these orbitals are arranged into energy levels or shells. The behavior of subatomic particles like protons and neutrons, which make up the nucleus, is also taken into consideration by the model.

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Answer:

The red substance was ionic. The white substance was molecular.

Explanation:

B.C.

If Clarisse had three substances, A white substance was waxy and malleable. A red crystal was translucent, and it cracked when she hit it with a hammer. A silver substance could be flattened by hitting it with a hammer, but it did not crack. the two true statements are the red substance was ionic and the white substance was molecular. therefore the correct option is B and D.

The chemical compound is a combination of two or more either similar or dissimilar chemical elements, for example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom.

These chemical compounds are formed because of different types of bonds between the constituent's elements, the chemical bonds are mainly ionic bonds, covalent bonds,s, and hydrogen bonds.

Ionic bonds are formed due to the transfer of electrons between two bond-forming pairs differentiated by their electronegativity.

Covalent bonds are formed by the sharing of electrons. Generally, organic compounds are formed as the reason for covalent bonds.

As the white substance is waxy and malleable and the silvers substance could be flattened by hitting with a hammer but it did not crack it means the white substance is a metallic material that is molecular in nature , the red crystal is translucent and cracked when hit with a hammer this means it is ionic in nature.

Thus, the correct options are option B and option D.

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The catch in this one is:  We don't know how much force the student used to push the bike.  

It wasn't necessarily the 100N.  That's just the weight of the bike. But you know that you can push a car, a wagon, or a bicycle hard, you can push it not so hard, you can give it a little push, you can give it a big push, you can push it strong, you can push it weak, you can push it medium.  The harder you push, the more it'll accelerate, but it's completely up to you how hard you want to push.  That's what's so great about wheels !  That's why they were such a great invention ! This is where I made my biggest mistake. This guy came into my store one day and said he's got this great invention, it's definitely going to take off, it'll be a winner for sure, he called it a "wheel".  I looked at it, I turned it over and I looked on all sides. I thought it was too simple.  I didn't know then it was elegant. I threw him out.  I was so dumb.  I could have invested money in that guy, today I would have probably more than a hundred dollars.

Anyway, can we figure out how much force the student used to push with ?  Stay tuned:

-- The bike covered 15 meters in 5 seconds.  Its average speed during the whole push was (15m/5s) = 3 meters/sec.

-- If the bike started out with no speed, and its average speed was 3 m/s, then it must have been moving at 6 m/s at the end of the push.

-- If its speed increased from zero to 6 m/s in 5 seconds, then its acceleration was (6m/s / 5 sec) = 1.2 m/s²

-- The bike's weight is 100N.  

(mass) x (gravity) = 100N

Bikemass = (100N) / (9.8 m/s²)

Bikemass = 10.2 kilograms

-- F = m A

Force = (mass) x (acceleration)

Force = (10.2 kg) x (1.2 m/s²)

Force = 12.24 N

-- Work = (force) x (distance)

Work = (12.24 N) x (15 m)

Work = 183.67 Joules

-- Power = (work done) / (time to do the work)

Power = (183.67 joules) / (5 seconds)

Power = 36.73 watts

Explanation:

Michael should put the vase at the bottom of the shelf to reduce the potential energy because the height of the vase to the floor is nearly zero.