Which one of the following statements concerning electromagnetic waves is false?a. One form of electromagnetic radiation is visible light.b. All electromagnetic waves travel through a vacuum region at the speed of light.c. All electromagnetic waves are transverse waves.d. All electromagnetic waves have the same frequency.e. Electromagnetic waves can travel through solids, liquids, gases, and vacuumregions

Initial velocity U = 0

Final velocity V = 32.23 m/s

Explanation:

Given that a coin is dropped from the top of the Tower of Pisa, 53m above the ground.

What is the coin's initial velocity ?

Since the coin is dropped from the tower, the initial velocity U will be equal to zero.

Therefore, U = 0

But the final velocity V will be calculated by using the formula

V^2 = U^2 + 2gH

V^2 = 0 + 2 × 9.8 × 53

V^2 = 1038.8

V = sqrt ( 1038.8)

V = 32.23 m/s

sorry if did not help :(

Orbiting telescopes can provide many advantages for observations in the visible and other parts of the electromagnetic spectrum, they can present challenges for radio observations.

Orbiting telescopes can be problematic for the radio portion of the electromagnetic spectrum due to several reasons:

1. Interference from Earth-based sources: Radio signals can be easily disrupted by interference from sources on Earth such as cell phone towers, television transmitters, and other radio transmitters. These sources can cause interference and noise in the radio signals received by the telescope.

2. Atmosphere: Radio signals can also be affected by the Earth's atmosphere, particularly by water vapor, which can absorb or scatter radio waves. Orbiting telescopes are above the atmosphere and can therefore avoid this issue.

3. Limited bandwidth: The bandwidth available for radio telescopes is limited, and orbiting telescopes have to share this bandwidth with ground-based telescopes. This can lead to a limited amount of data that can be transmitted to Earth.

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Answer: the marble will remain in place at a constant velocity of zero

Explanation:

Newton's first law states that a body at rest will remain at rest, and a body in motion will remain in motion in a straight line at a constant velocityunless acted upon by an outside force

Explanation:

This exposes the individual to danger. Remember, the Newton Law of motion which says that an object under the state of rest will remain in that state (inertia) unless when acted upon by an external force.

In this scenario, standing at the back of the pickup truck presents danger especially if the truck suddenly stops; this individual would experience an upward thrust due to inertia that may disbalance him.

Answer:

the average speed of the car during this time interval is 40 m/s i thinkk..

Answer:

1.25m/s

Explanation:

Velocity is defined as the change of displacement with respect to time. Mathematically, velocity = displacement/time

Given displacement = 3km and time = 40minutes

Converting km to meters and minuetes to seconds;

Since 1 km = 1000m

3 km = (3*1000)m

3 km = 3000m

Also 1minute = 60seconds

40 minutes = 60*40 = 2400seconds

velocity = displacement/time

Velocity (in m/s) = 3000/2400

Velocity (in m/s) = 30/24

Velocity (in m/s) = 5/4

Velocity (in m/s) = 1.25m/s

Hence, the average velocity of he hiker is 1.25m/s

Answer:

Explanation:

Sure, here are five examples of problem-solving using the GRESA method for speed:

Example 1:

Given: A car travels 240 km in 4 hours.

Required: What is the average speed of the car?

Equation: Speed = Distance / Time

Solution: Speed = 240 km / 4 hours = 60 km/hour

Answer: The average speed of the car is 60 km/hour.

Example 2:

Given: A train travels at a speed of 100 km/hour for 2 hours, and then at a speed of 80 km/hour for the next 3 hours.

Required: What is the total distance traveled by the train?

Equation: Distance = Speed x Time

Solution: Distance = (100 km/hour x 2 hours) + (80 km/hour x 3 hours) = 200 km + 240 km = 440 km

Answer: The total distance traveled by the train is 440 km.

Example 3:

Given: A cyclist travels at a speed of 30 km/hour for 2 hours, and then at a speed of 40 km/hour for the next 3 hours.

Required: What is the average speed of the cyclist for the entire journey?

Equation: Average speed = Total distance / Total time

Solution: Total distance = (30 km/hour x 2 hours) + (40 km/hour x 3 hours) = 60 km + 120 km = 180 km

Total time = 2 hours + 3 hours = 5 hours

Average speed = 180 km / 5 hours = 36 km/hour

Answer: The average speed of the cyclist for the entire journey is 36 km/hour.

Example 4:

Given: A boat travels upstream at a speed of 10 km/hour, and downstream at a speed of 20 km/hour. The speed of the current is 5 km/hour.

Required: What is the speed of the boat in still water?

Equation: Speed of boat in still water = (Speed downstream + Speed upstream) / 2

Solution: Speed downstream = 20 km/hour, Speed upstream = 10 km/hour

Speed of current = 5 km/hour

Speed of boat in still water = (20 km/hour + 10 km/hour) / 2 = 15 km/hour

Answer: The speed of the boat in still water is 15 km/hour.

Example 5:

Given: A car travels a distance of 90 km in 2 hours. If the speed of the car had been 10 km/hour more, it would have taken 1 hour less to cover the same distance.

Required: What is the original speed of the car?

Equation: Distance = Speed x Time

Solution: Let the original speed of the car be x km/hour

Distance traveled at original speed = 90 km

Time taken at original speed = 2 hours

Distance traveled at increased speed = 90 km

Time taken at increased speed = 2 - 1 = 1 hour

Using the equation Distance = Speed x Time, we get:

90 = x * 2

90 = (x + 10) * 1

Solving these equations simultaneously, we get:

x = 40 km/hour

Answer: The original speed of the car is 40 km/hour.

Answer:

the gravitational force

Answer:

mass

Explanation:

This energy of motion is what we call kinetic energy. ... In fact, kinetic energy is directly proportional to mass: if you double the mass, then you double the kinetic energy. Second, the faster something is moving, the greater the force it is capable of exerting and the greater energy it possesses.

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Answer:

Explanation:

the answer is there, is in the graph

How fast sound travels through water at sea level and how deep the ocean is  1.432 x 10³m.

Given

Bulk modulus ( B ) = 0.21 x 10¹⁰ N/ m²

density of sea le ) = 1024 kg / m³

Speed of sound In sea water ( v ) = √B/е

V =√0. 21 x 10¹⁰/1024

V = 1-.432 x 10³ m/s

The Speed of sound has to travel at the bottom of sea and get reflected back to ship itself the distance travel by Sound is 2x

So

(t = 2 see )

2x = vt

2x = 1 . 432 x 10³ x 2

x = 1.432 x 10³m

By observing the velocity of this compressed area as it passes through the medium, we can determine the speed of sound. The sound wave travels at a speed of approximately 343 meters per second, or 767 miles per hour, in dry air at 20 degrees Celsius.

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The spring constant for a spring is stretched 0.15 m and the force was 1500 N is 10000.

The spring constant, k, is a measure of the spring's stiffness. It varies depending on the spring and material. The greater the spring constant, the stiffer the spring and more difficult to stretch.

The letter k symbolizes the "spring constant," which is a number that tells us how "stiff" a spring is.

If k is large, it means that more force is required to stretch it a certain length than would be required to stretch a less stiff spring the same length.

We know that,

F = k(x)

Where k is the spring constant.

Here, it is given that:

F = 1500N

x = 0.15m

So,

1500 = k (0.15)

k (0.15) = 1500

k = 1500/0.15

k = 150000/15

k = 10000

Thus, the value of spring constant is 10000.

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The prove of  Angle XYZ- Angle NYM is given below:

Note that from the image given;

Since ∠XYZ is said to be congruent to ∠NYM it can be proven by the use of the reflexive property.

The reflexive property is one that informs that any shape is regarded congruent to itself.

Since ∠NYM has a different way to call ∠XYZ that uses a different vertexes, but the sides are made up of the two angles which are said to be the same.

Therefore , ∠XYZ ≡ ∠NYM are proved by the reflexive property.

Since ΔXYZ is the same with Δ NYM, it can be proven by the AA (angle-angle) similarity theorem.

We have 2 angles Δ XYZ and Δ NYM:

Note that ∠YXZ ≡ ∠YNM

              ∠XYZ ≡ ∠NYM

So,  ΔXYZ is said to be the same to ΔNYM and it is proven by the AA similarity theorem.

Therefore, The prove of  Angle XYZ- Angle NYM is given below:

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Answer:

1. parrael

2. corresponding angles theorem

3. NYM

4. AA

Explanation:

just took it

The output power in mW is 3.98 mW. In this communication system, the input power is 100 mW, and the system has a total gain of 20 dB and a total loss of -13 dB.

For calculating the output power, first, convert the gain and loss values from dB to a linear scale.

The gain of 20 dB can be converted to a linear scale using the formula:

\(Gain (linear scale) = 10^{(Gain (dB) / 10)}.\)

So,\(Gain (linear scale) = 10^{(20/10)} = 100.\)

Similarly, the loss of -13 dB can be converted to a linear scale using the formula:

\(Loss (linear scale) = 10^{(Loss (dB) / 10)}.\)

So,\(Loss (linear scale) = 10^{(-13/10)} = 0.0501.\)

Now, calculate the output power by multiplying the input power by the gain and dividing it by the loss.

Output power = (Input power) * (Gain (linear scale) / Loss (linear scale))

= 100 * (100 / 0.0501) = 3.98 mW.

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To determine the frequencies at which the string will not resonate, we need to consider the harmonics of the fundamental frequency. In the case of a string fixed at both ends, the resonant frequencies are integer multiples of the fundamental frequency.

Calculate the resonant frequencies of the string:

Fundamental frequency (n = 1): f₁ = 150 Hz

First harmonic (n = 2): f₂ = 2 × f₁ = 2 × 150 Hz = 300 Hz

Second harmonic (n = 3): f₃ = 3 × f₁ = 3 × 150 Hz = 450 Hz

Third harmonic (n = 4): f₄ = 4 × f₁ = 4 × 150 Hz = 600 Hz.So, the frequencies at which the string will not resonate are the non-integer multiples of the fundamental frequency. In other words, any frequency that is not a whole-number multiple of 150 Hz will not resonate. Frequencies such as 175 Hz, 220 Hz, or 280 Hz will not resonate because they are not integer multiples of the fundamental frequency.

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The acceleration of an astronaut standing on the inner surface of a cylindrical space station of radius R rotating with angular velocity w is w^2R towards the center of the station. To make the astronaut feel as if they were on the surface of the Earth, the space station with a radius of 50 m must rotate with an angular velocity of approximately 1.53 radians per second.

When an object is rotating, there is a centripetal acceleration towards the center of rotation, given by a = w^2R, where w is the angular velocity and R is the radius. Therefore, the acceleration of an astronaut standing on the inner surface of the space station is w^2R towards the center of the station.

To make the astronaut feel as if they were on the surface of the Earth, the centripetal acceleration of the space station must be equal to the acceleration due to gravity on Earth, which is approximately 9.8 m/s^2. Therefore, we can set w^2R = 9.8 and solve for w to get w ≈ 1.53 radians per second.

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Answer:

140 m/s

Explanation:

v = u + at

v = 8 + 3.5(40) = 140 + 8 = 140

a) The block goes 7.4 m up the plane

b) It takes 1.62 seconds to get there

c) The speed at the bottom is -9.1 m/s

The initial speed, v₀ = 9.12 m/s

Angle of inclination, θ = 35°

Note that the summation forces on the block as it goes up the inclined plane is 0. That is, ΣF = 0

mgsinθ + ma = 0

mgsinθ = -ma

a = -gsinθ

The acceleration of the block up the plane is:

a = -9.8 sin 35

a = -5.62 m/s²

a) How far up the plane does it go?

Using the equation v² = v₀² + 2as

At the maximum distance up the plane, v = 0

0² = 9.12² + 2(-5.62)s

0 = 83.17 - 11.24s

11.24s = 83.17

s = 83.17/11.24

s = 7.4 m

The block goes 7.4 m up the plane

b) How long does it take to get there?

Using the equation v = v₀ + at

Since we want to calculate the time taken to reach the maximum distance, the speed at this point is 0. v = 0m/s

Substitute a = -5.62, v₀ = 9.12, and v = 0 into v = v₀ + at

0 = 9.12 + (-5.62)t

5.62t = 9.12

t = 9.12 / 5.62

t = 1.62 seconds

c) What is its speed when it gets back to the bottom?

The total time it takes the block to go up and down the plane = 2(1.62)

The total time it takes the block to go up and down the plane = 3.24 s

To calculate the speed of the block when it gets back to the bottom, use the equation v = v₀ + at

v = 9.12 + (-5.62)(3.24)

v = 9.12 - 18.21

v = -9.1 m/s

When a ray of white light passes through a prism, it splits into seven colors because of the process of refraction. Refraction is a phenomenon that occurs when light passes from one medium to another, and the speed of light changes. The change in the speed of light causes the direction of light to change.

A prism is a triangular piece of glass or other transparent material that has two triangular bases and three rectangular faces. The process of refraction causes the light to bend as it enters and exits the prism. The amount of bending depends on the angle at which the light enters the prism and the angle of the prism's surface.
White light is composed of different colors, each having a different wavelength. When light enters the prism, the different colors bend at slightly different angles. The shorter wavelength light (violet) bends the most, while the longer wavelength light (red) bends the least. The other colors, blue, green, yellow, orange, and indigo, are also refracted but at angles between violet and red.

The different colors of the spectrum that are formed as the white light passes through the prism are arranged in the order VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, and Red). This sequence of colors is known as the visible spectrum. The reason why we see these colors is that the prism separates the different colors of light that were once combined in white light.

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Answer:

The ratio of the potential difference across a metallic conductor to the current in the conductor is known as.

B. Resistance.

Explanation:

According to ohms law   " the current  passing through a conductor is directly proportional to the potential difference between the ends provided the temperature of the wire remains constant".

What is resistance ?

Resistance is a measure of the opposition to current flow in an electrical circuit

what is a resistor ?

a resistor is a n electric conductor which forms resistance to free flow of electric current, the resistance is measured in Ω

The ratio of the potential difference across the conductor to the current is called resistance

It is defined as the ratio of the potential difference across the conductor to the current. The resistance is measured in Ω.

\(R = \dfrac VI\)

Where,

\(R\) - resistance

\(V\)- voltage (Potential difference)

\(I\) - current

Therefore, the ratio of the potential difference across the conductor to the current is called resistance.

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Answer:

His third law states that for every action (force) in nature there is an equal and opposite reaction. If object A exerts a force on object B, object B also exerts an equal and opposite force on object A. In other words, forces result from interactions

Newton’s Third Law: Action & Reaction

Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.

His third law states that for every action (force) in nature there is an equal and opposite reaction. If object A exerts a force on object B, object B also exerts an equal and opposite force on object A. In other words, forces result from interactions.

Examples of action and reaction involving aerodynamics:

----------------

HOPE THIS HELPS <3

Newton's Third law of motion states :

" Every action has an equal and opposite reaction "

i.e If a force is applied by an object A on another object B then that object B also exerts a foce on object A, that is of same magnitude and opposite direction to the force applied by object A.

Ex - A book on a table exerts gravitational force on the table and table exerts back a normal force on the book.

so the value of wavelength λ=0.75*10^4 m

your question seems incomplete, I think you are asking the question which is given below.

Question: As the frequency of electromagnetic waves increases, what happens to the wavelength?

when the frequency of an electromagnetic wave increases, its wavelength would decrease, according to eq (i).

speed of light = frequency X wavelength ............(i)

as the speed of light is constant in the same medium.

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Answer:

The answer to the question is:

An atom's smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to remove.

Explanation:

J.J. Thomson discovered the electron. Atoms are neutral overall, therefore in Thomson’s ‘plum pudding model:

-    atoms are spheres of positive charge

-    electrons are dotted around inside

Thus the answer to your questions is, An atom's smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to remove.

Answer:

Control Variable

Explanation:

It must be constant throughout the experiment.

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Answer:

A Steam room

Explanation:

Most people use a treadmill, free weights, and an elliptical

Hope this helps!

Steam room is not a popular home fitness equipment purchase and is denoted as option A.

This is an enclosed space which contains heat from the steam generators and is commonly used in spas etc.

It however isn't a popular fitness equipment as it is often used for recovery and relaxation.

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