Why do electromagnetic waves not require a medium for travel?

a.because electromagnetic waves travel too fast for stationary particles to move with them

b.because electromagnetic waves transmit energy without compressing the particles of the medium

c.because electromagnetic waves generate their own particles for compression and use these for movement

d.because electromagnetic waves move in two-dimensional space, the particles of mediums exist in 3-d space?

the answer is C. according to the method of their information

Answer:

D) Spinning a coil of wire near a large magnet.

Explanation:

From Faraday's law of induction, when a conducting coil of wire is placed in changing magnetic flux, an emf is induced which produces current in the coil.

Induced emf is given by:

[tex]e = -\frac{d\phi}{dt}[/tex]

A generator is based on the same principle.

The mechanical energy of rotating coil is converted to electrical energy when current is induced. Thus, the correct option is D) Spinning a coil of wire near a large magnet.

An electric generator converts mechanical energy into electrical energy via electromagnetic induction, which is achieved by spinning a coil of a wire near a large magnet. This process is described accurately in option D of the multiple choice question.

An electric generator operates on the principle of electromagnetic induction, which was discovered by Michael Faraday. It involves the conversion of mechanical energy into electrical energy by spinning a magnet within a coil or spinning a coil within a magnetic field. Therefore, the correct answer to which process transforms mechanical energy into electrical energy in an electric generator is D) Spinning a coil of wire near a large magnet.

This process generates an electromotive force (emf) that results in the flow of electric current. The other options mentioned, such as using wind to spin a magnet around (A), connecting a battery to a coil of wire (B), or turning a wheel that contains electrons (C), do not accurately describe the fundamental operation of an electric generator.

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Final answer:

The greatest energy transition from a higher energy level to a lower one is represented by the emission of a blue photon of 450 nm.

Explanation:

The greatest energy transition from a higher energy level to a lower one is represented by the emission of a blue photon of 450 nm. This is because the energy of a photon is inversely proportional to its wavelength. As the wavelength decreases, the energy increases. Since blue light has a shorter wavelength than red, green, and yellow light, it has the highest energy.

When the current is the same through all the resistors and the batteries of a circuit, you have resistors in series. Option B is correct.

In the series circuit, the amount of current flowing through any component in a series circuit is the same and the sum of the individual resistances equals the overall resistance of any series circuit.

The voltage in a series circuit, the supply voltage, is equal to the total of the individual voltage drops.

Components linked in series share a single “electrical route,” and each component receives the same current, which is equal to the network's current.

When the current is the same through all the resistors and the batteries of a circuit, you have resistors in series.

Hence,option B is correct.

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Final answer:

James's average speed was calculated by dividing the distance he traveled, 8.45 km, by the time it took, 0.65 hours, resulting in an average speed of 13 km/h.

Explanation:

To find James's speed, you need to divide the total distance he traveled by the total time it took him. In this case, the distance traveled is 8.45 km and the time is 0.65 hours. Use the formula speed = distance/time to calculate the speed.

The calculation would be:

So, James's average speed while riding his bike was 13 kilometers per hour (km/h).

The typical speed is the all out distance went by the item in a specific time stretch. The typical speed is a scalar amount. It is addressed by the greatness and doesn't have heading.

Answer: The correct answers are 482.4 m/s and 21.96 kg.

Explanation:

The expression for the kinetic energy in terms of momentum of an object is as follows;

[tex]KE=\frac{p^{2} }{2m}[/tex]

Here, KE is the kinetic energy, p is the momentum and m is the mass of the object.

It is given in the problem that an object has a kinetic energy of 275 j and a momentum of magnitude 25.0 kg · m/s.

Calculate the mass of the object.

[tex]KE=\frac{p^{2} }{2m}[/tex]

Put p=25.0 kg · m/s and KE= 275 J.

[tex]m=\frac{25^{2} }{2(275)}[/tex]

[tex]m=1.14 kg[/tex]

Calculate the speed of the object.

[tex]KE=\frac{1}{2} mv^{2}[/tex]

Put m= 1.14 kg and KE= 275 J.

[tex]v=\sqrt{\frac{2(275)}{1.14} }[/tex]

v=21.96 m/s

Therefore, the speed of the object is 21.96 m/s and the mass of the object is 1.14 kg.

3. D-Microwaves

1. C-electromagnetic spectrum

2. B-radio waves

^^(for those doing the three question physical science test)

The object's momentum remains the same as it descends freely toward the earth.

So, option 3. is correct.

Momentum is a measurable quantity that exists because an object is moving and has mass. The mass multiplied by the velocity equals momentum. If an item is stationary, its velocity is zero, and it has no momentum.

When an object descends toward Earth, it accelerates due to gravity, accumulating speed and momentum until the upward force of air resistance equals the downward force due to the object's weight under gravity, a point known as terminal velocity.

The law of conservation of momentum asserts that the overall momentum of objects that interact does not change in the absence of external forces such as friction.

So,

The object's momentum 3. remains the same as it descends freely toward the earth.

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(a) Angular Speed is 140π radians per hour.

(b) The linear speed of a passenger on the Ferris wheel is approximately 3.249 feet per minute.

To find the angular speed of the Ferris wheel in radians per hour, you can use the following formula:

Angular Speed (ω) = (2π * Number of Revolutions) / Time

(a) Angular Speed in Radians per Hour:

Number of Revolutions = 70 revolutions

Time = 1 hour

ω = (2π * 70) / 1

ω = 140π radians per hour

Now, to find the linear speed of a passenger in feet per minute, you need to consider the circumference of the Ferris wheel.

(b) Circumference of the Ferris Wheel:

The diameter of the Ferris wheel is given as 62 feet, so the radius (r) is half of that, which is 31 feet. The circumference (C) of the wheel is given by:

C = 2πr

C = 2π * 31 feet

C ≈ 194.94 feet

Now, to find the linear speed (v) in feet per minute, you can use the formula:

Linear Speed (v) = (Circumference / Time)

Time in this case is 1 hour, which is equivalent to 60 minutes:

v = 194.94 feet / 60 minutes

v ≈ 3.249 feet per minute

Hence, the linear speed of a passenger on the Ferris wheel is approximately 3.249 feet per minute.

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Final answer:

The statement is false since merely swinging the golf club in a northern direction does not ensure that the ball will travel in that direction due to external influences like wind and gravity, much like an airplane can be blown off course.

Explanation:

The statement "The golf club is swung in a northernly direction, and that is the direction the ball travels" is false. In physics, particularly when discussing vectors and motions, the direction that an object is initially moved by a force (like a golf club hitting a ball) does not necessarily dictate that the object will continue to move in that initial direction. Various other forces and factors can influence the trajectory. For example, merely swinging the club in a northern direction does not account for factors such as wind, slope of the ground, spin of the ball, and gravity, all of which can alter the path of the golf ball.

Consider the analogy provided using an airplane's motion. An airplane heading north can be moved off that northward path by the wind, causing it to drift westward. Similarly, swinging the golf club in one direction does not guarantee the ball will follow that path precisely. Additionally, according to physics, when a magnet breaks, all pieces will indeed still have north and south poles, indicating that the physical direction is not the only factor determining the outcome—in both magnetism and ball trajectory.

Answer:

The answer would be TRUE

Peter and Paul did have a great influence on the early church.

Answer:

The machine with work input of 104,000Joules and work output of 92,000 has the greater efficiency

Explanation:

Efficiency of a machine is the ratio of work done by a machine(work output) to work put in the machine (work input).

Mathematically,

Efficiency = Work output/Work Input ×100

For the machine with work output of 89,000Joules and work input of 102,000Joules, its efficiency will be;

Efficiency = 89,000/102,000×100

Efficiency = 87.5%

Similarly for the other machine with work output of 92,000Joules and work input of 104,000Joules, its efficiency will be;

Efficiency = 92,000/104,000×100

Efficiency = 88.5%

Comparing the efficiency of both machines, the machine with efficiency of 88.5% has greater efficiency.