A common characteristic of sound waves is that they.

Answer:

ground Waves

Explanation:

Answer:

Kinetic energy = 5400000 J

Height, h = 45.91 m

Explanation:

It is given that,

Mass of the roller coaster train, m = 12,000 kg

Velocity of the train, v = 30 m/s

Kinetic energy is given by :

KE=\dfrac{1}{2}mv^2KE=

2

1

mv

2

KE=\dfrac{1}{2}\times 12000\ kg\times (30\ m/s)^2KE=

2

1

×12000 kg×(30 m/s)

2

KE=5400000\ JKE=5400000 J

So, the kinetic energy of the train at the top speed is 5400000 J.

For height

According to law of conservation of energy :

PEni+KE i=PE f+KE fPE i +KEi

=PEf +KE f

0+5400000\ J=mgh+00+5400000 J=mgh+0

5400000\ J=mgh5400000 J=mgh

h is the height.

5400000\ J=12000\ kg\times 9.8\ m/s^2\times h5400000 J=12000 kg×9.8 m/s

2

×h

h=45.91\ mh=45.91 m

Hence, this is the required solution.

Option b) is correct regarding density of terrestrial planets and jovian planets.

Because of the environment in the early solar system where they evolved, terrestrial planets have more density than jovian planets. The inner solar system, where the temperature was high enough to prohibit lighter elements like hydrogen and helium from condensing into solid form, is where the terrestrial planets, including Mercury, Venus, Earth, and Mars, formed. Because of this, the terrestrial planets could only form and accrete from dense materials like rock and metal.

Nonetheless, the jovian planets—Jupiter, Saturn, Uranus, and Neptune—formed in the solar system's outermost regions, where it was much colder. Lighter elements like hydrogen and helium were also able to condense as a result, in addition to rock and metal. The jovian planets are less dense than the terrestrial planets because they have a significantly higher percentage of gas and ice in their makeup.

The correct response, which explains why terrestrial planets are denser than jovian planets, is option (b).

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Answer:

\(9.5\; {\rm m}\).

Explanation:

Let \(u\) and \(v\) denote the velocity of this hockey player before and after stopping, respectively. The question states that \(u = 9.5\; {\rm m\cdot s^{-1}}\) and implies that \(v = 0\; {\rm m\cdot s^{-1}\) since the hockey player has come to a stop.

The duration of this acceleration is \(t = 2\; {\rm s}\).  

Since the acceleration of this hockey player was constant, SUVAT equation would apply. In particular, the SUVAT equation \(x = (1/2)\, (v + u) \, (t)\) gives the displacement \(x\) of this hockey player during that \(2\; {\rm s}\) of acceleration:

\(\begin{aligned} x &= \frac{1}{2}\, (9.5\; {\rm m\cdot s^{-1}} + 0\; {\rm m\cdot s^{-1}})\, (2\; {\rm s}) = 9.5\; {\rm m} \end{aligned}\).

In other words, this hockey player would have travelled \(9.5\; {\rm m}\) while stopping.

Answer:

There cannot be a force without motion and if there is no motion, then there is no force acting.

Explanation:

A force is a vector that causes an object with mass to accelerate.

Answer:

because force need motion

Explanation:

After 1 day has passed, approximately 6.25% of Element Z would be remaining.

The half-life of an element is the time it takes for half of the initial amount of the element to decay or transform into another element or isotopes. In this case, Element Z has a half-life of 5 hours.

To determine the percentage of Element Z remaining after 1 day (24 hours), we need to calculate the number of half-lives that have occurred.

Since the half-life of Element Z is 5 hours, there are 24 hours divided by 5 hours, which equals 4.8 half-lives.

Each half-life reduces the amount of Element Z by half. So, after 4.8 half-lives, the remaining amount of Element Z would be (1/2)^(4.8) = approximately 0.0625 or 6.25%.

Therefore, after 1 day has passed, approximately 6.25% of Element Z would be remaining.

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Answer:

-5

Explanation:

-15/3

Even when we don't know its exact location, a classical particle has a specific position at a specific moment. For a quantum particle, this is no longer valid. The probability densities and energy eigenfunctions for the quantum oscillator go over the boundaries of the conventional turning points.

The analog of the classical harmonic oscillator in quantum mechanics is called the quantum harmonic oscillator. One of the most crucial model systems in quantum mechanics is the arbitrary smooth potential, which is one of the most common ways that a smooth potential can be represented as a harmonic potential at a stable equilibrium point. It is referred to as "harmonic" because the solution of Newton's second law, a second-order differential equation that governs the motion of the item, is a series of sines and cosines of time with a specific frequency, exactly like the outcome.

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Answer:

1500 J

Explanation:

Work = force * distance   =  50 N * 30 M = 1500 J

Answer:

eukaryotic cells

Explanation:

"Smooth endoplasmic reticulum (sER) is (a part of) endoplasmic reticulum that is tubular in form and lacks ribosomes. It is present in eukaryotic cells and is associated with lipid synthesis, carbohydrate metabolism, regulation of calcium concentration, and drug detoxification"

source: biologyonline

Cyclic and noncyclic electron flow are two different types of processes involved in photosynthesis. In cyclic electron flow, the electrons follow a circular pathway, which involves only photosystem I (PSI).

Electrons move from the excited chlorophyll molecules in PSI to electron acceptors and then return to the chlorophyll molecules of PSI, generating ATP in the process.

There is no net production of oxygen gas, and no NADPH is produced. This process is thought to play a role in generating additional ATP for use in the cell.

In noncyclic electron flow, the electrons pass from photosystem II (PSII) to PSI, generating ATP and NADPH. The electrons are initially excited in PSII, and then passed through an electron transport chain to PSI, where they are excited again and used to generate ATP and NADPH.

Oxygen gas is produced during this process through the splitting of water molecules in PSII. This process is the primary means of generating energy for the cell in the form of ATP, and also produces the reducing agent NADPH, which is used in various anabolic reactions.

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The speed at which the stone hits the water is 13.6m/s and the initial height of the stone is 7.6m.

Initial velocity of stone =  6 ms⁻¹

At the maximum height, the final velocity, v = 0

Acceleration of the stone, g = 9.8 ms⁻²

Time taken to reach maximum height = t₁

t₁ = v - u/g

since the stone is travelling upwards, g = -9.8 m/s⁻²

t₁ = 0 - 6/-9.8

t₁ = 0.61 s

Time take to fall from maximum height, t = 2 - 0.61s

Time take to fall from maximum height = 1.39s

where u = 0 m/s

v = 0 + 9.8 * 1.39

v = 13.6 m/s

Initial height of stone = Height of bridge, H

Time taken by the stone to fall down from height, H in water, t = 2s

Initial velocity of stone = 6 ms⁻¹

Acceleration of the stone, g = 9.8 ms⁻²

H =  -6 * 2 + 9.8 * 2² /2

H = 7.6m

Therefore, the speed at which the stone hits the water is 13.6m/s and the initial height of the stone is 7.6m

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Answer:

The angle of incidence is 39 degrees

Explanation:

We would apply Snell's law which states that the ratio of the angle of incidence to the sine of the angle of refraction is constant. It is expressed as

n1Sinθ1 = n2Sinθ2

Sinθ1/Sinθ2 = n2/n1

where

θ1 is the angle of incidence

θ2 is the angle of refraction

n1 is the refractive index of air

n2 is the refractive index of glass

From the information given,

n1 = 1.6

θ2 = 90

n2 = 1

Thus,

1.6 x Sinθ1 = 1 x Sin90

Sinθ1 = 1Sin90/1.6 = 0.625

θ1 = Sin^-1(0.625)

θ1 = 39 degrees

Answer:

???????????????????????????????????????

Explanation:

Answer:

q r s t u v w x y z

Explanation:

It would have the least kinetic energy at point A

Kinetic energy is the energy an object possesses as a result of its motion. It is the energy associated with the movement of an object and is proportional to the mass of the object and the square of its velocity. The formula for kinetic energy is given by:

KE = 0.5 * m * v^2

where m is the mass of the object and v is its velocity. Kinetic energy is a scalar quantity and is measured in joules (J) or other units of energy.

Since the motion commenced at the point A, that is the point of the least kinetic energy.

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The textbook-earth system has a gravitational potential energy of 98 J relative to the floor.

Gravitational energy, also known as gravitational potential energy, is the potential energy possessed by a massive object in relation to another massive object as a result of gravity. It is the potential energy associated with the gravitational field that is released when two objects collide. Gravitational potential energy is the energy that an object possesses or acquires as a result of a change in its position when it is in a gravitational field. In layman's terms, gravitational potential energy is energy that is related to gravitational force or gravity.

Here,

The energy possessed by a body due to its placement in gravitational field. It is given by:

G.P.E. = m g h

m is the mass of the object, g is the acceleration due to gravity and h is the height.

mass of the book, m = 8.0 kg

height of the desk on which book is kept, h = 1.25 m

acceleration due to gravity, g = 9.8 m/s²

G.P.E = 8.0 kg × 9.8 m/s² × 1.25 m = 98 J

The gravitational potential energy of the textbook-earth system relative to the floor is 98 J.

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Answer:

-Radio waves

-Microwaves

-Infrared light (IR)

-Visible light

-Ultraviolet (UV)

-X-ray

-Gamma rays

(this is in order from the longest wavelength to shortest wavelength)

Yes i would personally get better results and be more motivated by participating in physical activities that are competitive or recreational.

My motivation would increase if I engaged in leisure physical activity. Because you must aspire for victory, competitive hobbies may come with a lot of responsibilities. Regular exercise will make you happy regardless of whether you're doing it to compete or just for the sake of it. similar to team sports like baseball, soccer, basketball, badminton, and volleyball. Because you'll be with people who share your passion for the sport but aren't competing with you, these leisure activities are a good idea.

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Answer:

Cerebrospinal fluid (CSF) is a clear fluid that surrounds the brain and spinal cord.

If k = 0.34, the temperature of the liquid after 7 hours will be T(t) = 84.7°F.

We can solve the above problem using Newton's Law of Cooling.

According to this Law, the rate at which a hot body loses heat is directly proportional to the difference between the temperature of the hot body and that of its surroundings.

T(t) = \(T_{s}\) + (\(T_{0}\) - \(T_{s}\))\(e^{-kt}\)

where,

t= time

T(t) = temperature of the given body at time t

\(T_{s}\) = surrounding temperature

\(T_{o}\) = initial temperature of the body

k = constant

Substituting the values we get,

T(t) = 76 + (170-76)\(e^{(-0.34)(7)}\)

T(t) = 84.7°F

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Answer: 109.9 km/h

Explanation:

To find the average speed of the relay team, we need to determine the total distance covered by the three animals and the time it takes for them to complete the race. Assuming each animal runs/swims at maximum speed for distance L, we can calculate the time it takes for each animal to complete its part of the relay as:

Cheetah: Time taken = Distance / Speed = L / 103

Falcon: Time taken = Distance / Speed = L / 148

Sailfish: Time taken = Distance / Speed = L / 92

Since the three animals take turns to complete the race, the total time taken for the relay race would be the sum of the time taken by each animal:

Total time taken = L/103 + L/148 + L/92

To find the average speed, we need to divide the total distance covered (3L) by the total time taken:

Average speed = Total distance / Total time

= 3L / (L/103 + L/148 + L/92)

= 3 / (1/103 + 1/148 + 1/92)

= 109.9 km/h (rounded to one decimal place)

Therefore, the average speed of the relay team is approximately 109.9 km/h.

Regenerate response

The relative velocity is obtained as 5.3 m/s from the calculation as shown below.

We know that motion refers to the change in the position of an object with time. Give that we know that motion is relative and the position of the two objects that are in motion must always be taken into consideration. In this case, we have the situation in which Timmy and his friends are moving backwards and the runway is moving forward thus they are actually moving in opposite directions as seen.

Let us note that velocity is a vector quantity hence we have to assign the forward direction as positive and the backwards direction as negative. Thus we can then take the relative motion between Timmy and his friend and the walk way can be obtained quite conveniently by the use of;

6.9 m/s - 1.6 m/s  = 5.3 m/s

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Answer:

55%

Explanation:

take efficiency=power output/power input multiply by 100%

The boat sinks by about 9.07 cm when the fishermen and their gear are aboard.

What is Mass?

Mass is a fundamental property of matter that measures the amount of matter in an object. It is a scalar quantity and is typically measured in units of kilograms (kg) or grams (g). Mass is different from weight, which is the force exerted on an object by gravity and varies depending on the strength of the gravitational field.

First, we need to find the volume of water displaced by the boat. Since the boat has a flat bottom, we can assume that it displaces a volume of water equal to its submerged depth multiplied by its bottom area. Let's assume that the boat sinks by a depth of h meters when the fishermen and their gear are aboard. Then:

Volume of water displaced = 4.0 m^2 × h

The weight of the water displaced is equal to the weight of the boat and everything in it, which is:

Weight of boat and gear = (60 + 300) kg × 9.81 m/\(s^{2}\)= 3528.6 N

The buoyant force is then:

Buoyant force = Weight of water displaced = Volume of water displaced × density of water × g

where g is the acceleration due to gravity. We can set this equal to the weight of the boat and gear:

4.0 \(m^{2}\) × h × 1000 kg/\(m^{3}\) × 9.81 m/\(s^{2}\) = 3528.6 N

Solving for h, we get:

h = 0.0907 m

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SinФ = w/l

SinФ = 4.33 / 5.0

Ф = arcsin 4.33/5.0

Ф = 59.99 degrees

Round to 60 degrees

Answer:

The projectile's horizontal speed is constant throughout the entire trajectory because gravity only acts downwards in the vertical direction.

Explanation:

I did this in Physics a while ago but I believe my answer is correct.

Hope this helps! (:

Answer:

Sustainable energy is essential to meet uncontrolled rising demand for energy, reduce pollution and shift to resources that can be used again and again.

Explanation:

Considering the Sustainable Goals floated by United Nation, it is essential for all countries to improve their score in all the SD goals.

One of the SD goal is to shift to sustainable energy.

Sustainable energy is essential from following three points

- Reuse of energy source again and again to outcome the fear of resource depletion

- Sustainable energy source shall ensure cleaner environment

- Sustainable energy sources are also essential to meet the rising consumption of energy with time all across the globe.

Some common examples are - Solar energy, Wind Energy, Energy from nuclear fuels etc.

The thinnest film of magnesium fluoride that can limit the reflection of 550-nm light is approximately 9.821 × 10^-7 m or 982.1 nm.

The thinnest film of magnesium fluoride that can limit the reflection of 550-nm light can be calculated using the concept of thin film interference. The formula for the minimum thickness of the film is given by t = (λ / 4) / (n - 1), where t is the thickness of the film, λ is the wavelength of light, and n is the refractive index of the film material.

In this case, the film is designed to limit the reflection of 550-nm light. Therefore, λ = 550 nm = 5.5 × 10^-7 m. The refractive index of magnesium fluoride is given as 1.38, and the refractive index of glass is 1.52.

Using the formula, the minimum thickness of the magnesium fluoride film can be calculated as follows:

t = (5.5 × 10^-7 m / 4) / (1.38 - 1.52)

  = (1.375 × 10^-7 m) / (-0.14)

  ≈ -9.821 × 10^-7 m

Therefore, the thinnest film of magnesium fluoride that can limit the reflection of 550-nm light is approximately 9.821 × 10^-7 m or 982.1 nm.

The explanation behind this is based on the principles of interference of light waves. When light passes through a thin film, some of the light reflects from the upper surface of the film and some from the lower surface.

These reflected waves can interfere constructively or destructively, depending on the thickness of the film and the wavelength of the light. In the case of destructive interference, the reflected waves cancel each other out, resulting in minimal reflection.

To achieve this, the thickness of the film needs to be such that the reflected waves from both surfaces are exactly out of phase and interfere destructively.

The formula mentioned earlier, t = (λ / 4) / (n - 1), calculates the minimum thickness required for destructive interference. By using the given values of λ (550 nm) and the refractive index of magnesium fluoride (1.38), we can calculate the minimum thickness to be approximately 982.1 nm.

Coating lenses with this thin film of magnesium fluoride helps reduce reflections and improve image clarity in sophisticated cameras, ensuring that the maximum amount of light is transmitted through the lens rather than being reflected away.

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The minimum velocity of the Salmon jumping at the given angle is 12.3 m/s.

The given parameters;

The time of motion to fall from 0.432 m is calculated as;

\(h = v_0_y + \frac{1}{2} gt^2\\\\0.432 = 0 + (0.5\times 9.8)t^2\\\\0.432 = 4.9t^2\\\\t^2 = \frac{0.432}{4.9} \\\\t^2 = 0.088\\\\t = \sqrt{0.088} \\\\t = 0.3 \ s\)

The minimum velocity of the Salmon jumping at the given angle is calculated as;

\(X = v_0_x t\\\\3.17 = (v_0\times cos(30.8)) \times 0.3\\\\10.567 = v_0\times cos(30.8)\\\\v_0 = \frac{10.567}{cos(30.8)} \\\\v_0 = 12.3 \ m/s\)

Thus, the minimum velocity of the Salmon jumping at the given angle is 12.3 m/s.

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