1. water moves every time there is a . 2. we , , and in waves. 3. the distance from crest to crest is the . 4. waves that come by often have a high . 5. how are high frequency waves different from low frequency waves? 6. low frequency waves have a wavelength. 7. high frequency waves have a wavelength. 8. all waves have a shape. 9. energy moves in . 10. we see different wavelengths as different . 11. what are 3 examples of electromagnetic waves? 12. the only difference between different electromagnetic waves is the . 13. radio signals are . 14. x-rays have a lot of and can travel through your skin and bones. 15. earthquakes can travel in . 16. the surface of the earth is floating on molten . 17. earthquake waves are called waves. 18. amplitude is the of the wave. 19. the longer the whistle is the the waves and the the note. 20. waves can carry from one place to another. 21. do all waves move up and down? 22. sonar uses sound waves to find things . 23. what are 2 things that use sonar?

A bit of the sunlit side of the moon shows with the light side being on the left called the illuminated crescent.

What is illuminated?

Illumination is the process of making an object or surface bright. It is most commonly used to refer to the artificial lighting of an area or object. In the scientific field, illumination is also used to refer to the reflection of light off a surface, such as a microscope slide or a cell culture plate. Illumination can be used to observe cells, measure chemical reactions and monitor light-sensitive materials. Illumination can also be used to detect light-emitting substances and identify particular components of a sample. In astronomy, illumination is used to study the properties of planets and stars. Illumination is also used to identify objects in space and observe the effects of light on distant galaxies.

Therefore, A bit of the sunlit side of the moon shows with the light side being on the left called the illuminated crescent.

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The correct sequence of images for the formation of our solar system from interstellar gas and dust is given below:

A. 2nd image

B. 1st image

C. 3rd image

The universe was formed by the straightforward expansion of a single point almost a billion years ago. This is known as the Bing Bang theory.

About 4.5 billion years ago, a dense cloud of interstellar gas and dust gave rise to our solar system. The supernova shockwave from a nearby exploding star, or supernova, may have caused the cloud to collapse. This dust cloud burst into a spinning disk of material known as a solar nebula when it disintegrated.

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If a uniform conducting rod has a potential difference across its ends, a steady current will flow through it. Since the rod is uniform, the current density will also be uniform.

From Ohm's Law, we know that the current density (J) is equal to the electric field (E) divided by the electrical conductivity (σ) of the material. In this case, the material is a conductor, and so its electrical conductivity is very high.

The potential difference (V) across the rod is given as 41 mV. The length (L) of the rod is given as 22 cm. The formula for the electric field inside a uniform conductor is given by:

E = V / L

Substituting the given values, we get:

E = (41 mV) / (22 cm) = 1.86 V/m

However, the unit for the electric field is not volts/meter (V/m) but newtons/coulomb (N/C) or equivalently volts/meter (V/m). Therefore, we need to convert the units from volts/meter to newtons/coulomb by multiplying by the conversion factor of 1 V/m = 1 N/C. This gives us the final answer:

E = 1.86 N/C

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Every four years on Election day, American citizens vote for a new president:

The American electoral system is a complex process used to elect the President and Vice President of the United States. It is made up of two key components: the popular vote and the Electoral College.

The popular vote refers to the vote of the American citizens, who cast their ballots for the Presidential candidates on Election Day. The candidate who receives the most popular votes in a state wins the state’s electoral votes.

The Electoral College is made up of 538 electors, who are selected by the political parties in each state. The number of electors each state has is based on the state's population, with each state receiving a minimum of three electors.

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The longest wavelength of the light that is capable to remove an electron from the potassium metal is 68 nm

The binding energy of the electron in potassium = 1.76 x 10⁶ J/mol

The longest wavelength required to remove the electron from the potassium can be found using the formula,

            E = hc / λ

where E is the binding energy of the potassium

           h is Planck's constant

           c is the speed of light

           λ is the wavelength of the light.

The energy required for one electron is

      1.76 × 10⁶  / 6.02× 10²³ = 2.92 × 10⁻¹⁸

Let us substitute the known values in the above equation, we get

            2.92 × 10⁻¹⁸ = 6.63 x 10⁻³⁴ x 3 x 10⁸ / λ

                             λ = 6.63 x 10⁻³⁴ x 3 x 10⁸ / 2.92 × 10⁻¹⁸

                                =  6.82 x 10⁻⁸

                                = 68.2 nm

Therefore, the wavelength of the light is 68.2 nm

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Weight of the man = m * g = 80 kg * 9.81 m/s^2 = 784.8 N

Potential energy of the man = mgh = 80 kg * 9.81 m/s^2 * 4.0 m = 3139.2 J

Using the formula for work done by a force, the average force exerted by the water on the man can be calculated as: F = (mgh) / d = 3139.2 J / 2.0 s = 1569.6 N.

Therefore, the average force exerted by the water on the man is 1569.6 N.

The mass of the man who steps off the diving platform is given as 80 kg in this scenario. Mass is a fundamental property of an object that describes the amount of matter present in it. In this case, the man is considered as a single object with a mass of 80 kg. This mass value is important in calculating the force exerted by the water on the man as he comes to rest. The mass of an object is an essential parameter in many physical calculations such as the calculation of kinetic energy, potential energy, and force.

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The correct option is B, the distance between mass reduces to half then gravitation force increases by four times.

According to newton's law of gravitation,

Force between two masses F = GMm / r^2

If distance is halved r = r/2

F' = GMm / (r / 2)^2 = 4GMm / r^2 = 4F

Gravitation force is a fundamental force of nature that exists between any two objects with mass. This force is responsible for keeping objects like planets, stars, and galaxies in motion, and is essential for the formation and stability of the universe. The force of gravity is proportional to the mass of the objects and the distance between them, according to the famous equation proposed by Sir Isaac Newton: F = G(m1m2)/d^2.

The force of gravity is an attractive force, meaning it pulls objects towards each other. This force is why objects fall to the ground when dropped and why planets orbit around their suns. The gravitational force also affects the flow of time and the curvature of space, as explained by Einstein's theory of general relativity.

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Complete Question: -

A planet is attracted to the sun with a certain force. if the distance from the sun to the planet is reduced by one half, what would happen to the force?

A. decreased by two times

B. increased by four times

C. increased by two times

D. decreased by four times

Pressure between the carton and the floor will be 1871 N/m².

Pressure is defined as the force applied perpendicular to an object's surface per unit area over which that force is distributed. Gauge pressure is the pressure in relation to the surrounding atmosphere. Pressure is expressed using a variety of units.

Given that a carton of paper has a mass of 22.7 kg. The area of the bottom is 0.119 m².

The pressure will be calculated as:-

P = Force / Area

Force =  Weight = mg

P = mg / A

P = ( 22.7 x 9.81 ) / 0.119

P = 1871 M / m²

Hence, the pressure will be 1871 N / m².

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The statement that explains how ocean-currents affect global climates is: "Water absorbs a lot of thermal energy and releases it over time and distance."

The ocean-currents can be say as the continuous movement of sea water bodies in the ocean. Ocean currents are like large rivers of water flowing through the oceans.

The movement of ocean-currents has a major impact on global climate because water is a good conductor and storage of heat.

When we check the factors which affects the ocean currents to happen we have to talk about Coriolis-Effect. Coriolis Effect refers to an internal force (Coriolis) that causes the deflection of an object in motion.

Wind, water density and topography are the other major factors which directly influence the ocean currents.

Strong winds can move the water surface causing the ocean currents. About water density, more dense water will sink and that sinking water pushes the water below it up. About topography, ridge in the ocean bottom moves the water upward, while valley in the ocean moves it downward.

When ocean currents flow, they absorb large amounts of thermal energy. This energy is then transported over time and distance, affecting the temperature and climate of the regions through which the currents flow.

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yes it does

well i hope this helps

The x-component of the acceleration of the box is given by the product of the acceleration a and the cosine of the angle theta between the force and the x-axis.

The x-component of the acceleration of the box can be found using the following formula:

a_x = F_x / m

Since the force is acting at an angle, we need to first find the x-component of the force, which can be calculated using:

F_x = F × cos(theta)

Assuming that the force F is the net force acting on the box and there are no other forces acting on it, we can use Newton's second law to find the magnitude of the force:

F = ma

where F is the net force, m is the mass of the box, and a is the acceleration of the box.

Therefore, the x-component of the acceleration of the box can be calculated as:

a_x = F_x / m

= (F × cos(theta)) / m

= [(ma) × cos(theta)] / m

= a × cos(theta)

where we have substituted the expression for the magnitude of the force from Newton's second law.

So, the x-component of the acceleration of the box is given by the product of the acceleration a and the cosine of the angle theta between the force and the x-axis.

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Your logical hypothesis is now subjected to methodical testing to support or refute the assumption. There are a number of factors that can affect an empirical hypothesis, causing modifications and leading to certain results.

The approach uses sample data. Data collection: We take a representative sample of the population. Making a Decision: We contrast the sample results with the population-based hypothesis.

In most cases, we contrast the estimated value of the population parameter with the value of a statistic calculated from the sample data.

A statement that can be supported by observations or tests concerning the natural world is called a hypothesis. Hypotheses must be falsifiable—that is, they must be formulated in a fashion that allows them to be disproven—and be evaluated scientifically in order to be considered to be true.

Therefore, while a theory is a group of closely related phenomena or observations, A testable hypothesis is a logical proposition.

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The center of mass of the two particles is located at (-0.76, 0).

To find the center of mass of the two particles, we need to calculate the coordinates of the point where the total mass of the system is concentrated.

                                 xcm = (m1x1 + m2x2) / (m1 + m2)

                                 ycm = (m1y1 + m2y2) / (m1 + m2)

where x1 and y1 are the coordinates of mass m1,

x2 and y2 are the coordinates of mass m2, and

m1 and m2 are the masses of the particles.

Substituting the given values, we get:

xcm = (6.0 kg)(-3.0 m) + (2.1 kg)(4.5 m) / (6.0 kg + 2.1 kg) ≈ -0.76 m

ycm = (6.0 kg)(0 m) + (2.1 kg)(0 m) / (6.0 kg + 2.1 kg) ≈ 0 m

Therefore, the center of mass of the two particles is approximately located at (-0.76, 0). This means that the total mass of the system can be thought of as being concentrated at this point, and any external forces acting on the system can be treated as if they are acting on this point.

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The age of the rock is 3.512 billion years.

What are 3 types of rocks?

1. Igneous rocks

2. Sedimentary rocks

3. Metamorphic rocks

For the first rock, the number of potassium-40 atoms is equal to the number of argon-40 atoms. That can only happen when when one half life cycle has elapsed. Therefore the age of this rock is indeed 1.25×109 years. Now let us calculate the age of the second rock sample. Let us say that the number of potassium-40 at the beginning was N​​​​​​0 and the number of potassium-40 after a particular time t us N. There after 1.25 billion years, N= N​​​​​​0 /2.  Now we know the decay constant. This means that every second,5.54×10-10 atoms of potassium-40 decay into argon-40. We can use this decay constant to calculate the time required for the number of argon-40 to be 7 times as much as potassium-40. We want the time required to get the condition N​​​​​ = N​​​​​​0/7. So the correct answer is 3.512 billion years.

Therefore,  the age of the rock is 3.512 billion years.

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The age of the rock is approximately 42 million years, calculated using the equation (7/8) = (1 - [tex]e^{-kt}[/tex] ) with k = ln(2)/1.25 billion years and solving for t.

What is the dating of rock?

The dating of rocks refers to the process of determining the age of rocks or geological events using various techniques, such as radiometric dating, relative dating, and stratigraphy. Radiometric dating involves measuring the ratio of parent and daughter isotopes in a rock, while relative dating involves determining the order of events in geological history. Stratigraphy involves analyzing the layers of sedimentary rocks to determine the relative age of the rocks and the events they represent. These techniques are used by geologists to study the history of the Earth and the processes that have shaped it over time.

The ratio of argon-40 to potassium-40 in a rock can be used to determine the age of the rock based on the half-life of potassium-40. The equation for the decay of potassium-40 to argon-40 is:

K-40 --> Ar-40 + e-

where e- represents an electron and a neutrino.

The half-life of potassium-40 is 1.25 billion years, which means that half of the original amount of potassium-40 will decay to argon-40 in 1.25 billion years. After another 1.25 billion years, half of the remaining potassium-40 will decay, and so on.

If a rock contains seven times as much argon-40 as potassium-40, that means the ratio of argon-40 to potassium-40 is 7:1. We can set up the following equation to solve for the age of the rock:

(7/8) = (1 - [tex]e^{-kt}[/tex])

where k is the decay constant for potassium-40, t is the age of the rock, and e is the mathematical constant approximately equal to 2.71828.

The decay constant for potassium-40 can be calculated using the following formula:

k = ln(2)/t1/2

where ln represents the natural logarithm and t1/2 is the half-life of potassium-40.

Plugging in the values, we get:

k = ln(2)/1.25 billion years = 0.00055 [tex]years^{-1}[/tex]

Substituting k into the first equation and solving for t, we get:

t = -ln(7/8)/0.00055 [tex]years^{-1}[/tex] = 42 million years

Therefore, the age of the rock is approximately 42 million years.

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In thermodynamic equilibrium, the different forms of energy in a system, including vibrational energy, must be in balance. Therefore, if nitrogen is in thermodynamic equilibrium, its vibrational energy will be in balance with its other forms of energy.

The vibrational temperature of a gas is related to the average vibrational energy of its molecules. In the case of nitrogen, which is a diatomic gas, its molecules have multiple modes of vibration, including stretching and bending vibrations. The vibrational temperature of nitrogen can be calculated from the Boltzmann distribution, which relates the temperature of the gas to the relative populations of its energy states.

The vibrational temperature of nitrogen at room temperature is around 335 K. This is significantly higher than its translational temperature, which is around 300 K. The reason for this is that the vibrational energy of nitrogen molecules is not the same as their translational energy. While translational energy is associated with the motion of the molecule as a whole, vibrational energy is associated with the internal motion of the atoms within the molecule.

The vibrational temperature of a gas is not necessarily the same as its translational temperature, because the two forms of energy are not directly related. In a gas that is not in thermal equilibrium, the vibrational and translational temperatures can be different. However, in a gas that is in thermodynamic equilibrium, the different forms of energy will be in balance, and the vibrational temperature will be related to the translational temperature through the equipartition theorem.

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By changing the amplitude of a mass on a spring the maximum displacement, velocity, potential energy, and kinetic energy of the system are all affected.

A mass on a spring changes its greatest displacement from its equilibrium position as its amplitude is changed. This has numerous effects on how the mass-spring system moves:

1. Changing the amplitude of a mass on a spring has no effect on the motion's period, which remains constant. The object's mass and the spring's spring constant are the only factors that affect the period.

2. Increases in the maximum velocity of the mass are correlated with increases in the amplitude of the mass on the spring. This is because the mass accelerates more when it is further away from its equilibrium position when it encounters a stronger force from the spring.

3. The system's maximum potential energy rises because a mass on a spring has potential energy that is proportional to its square of displacement from equilibrium. As a result, increasing the mass of the spring's amplitude likewise raises the system's maximum potential energy.

4. The system's maximal kinetic energy rises: The kinetic energy of the mass on the spring oscillates between zero and a maximum value as it moves back and forth. The maximal kinetic energy of the system grows as the mass of the spring's amplitude increases.

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The equivalent resistance of the resistive network is 6 ohms.

Resistance is the opposition to the flow of electric current, or the opposition to a change. It is caused by the collisions of electrons with the atoms in a material. Resistance is measured in Ohms and is represented by the Greek letter omega (Ω). Resistance is an important concept in electrical engineering and is used to calculate power, current, and voltage in electrical circuits. Resistance can be found in both conductors and insulators, and the resistance of a material depends on its composition, shape, and temperature. Resistance can be used to control the flow of current, protect circuits from damage, and convert electrical energy into heat. Resistance is an essential factor in determining the performance of electrical circuits.

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During the phase of full moon, the phase you would see for Earth would be a new moon. This is because during a full moon, the Moon is on the opposite side of the Earth from the Sun, so the side of the Moon that is facing the Earth is fully illuminated by the Sun.

When the Moon is positioned so that it is on the other side of the Earth from the Sun, it enters the full moon phase. This indicates that the Moon's side facing Earth is entirely lighted by the Sun, giving it the appearance of a brilliant, rounded disk in the sky.

The lunar cycle's brightest and most noticeable phase, the full moon, usually lasts for one or two nights. The Moon looks to be brightest and fullest at this moment, giving the ground below a dazzling glow.

In many cultures, the full moon is a significant cultural emblem and is frequently linked to mystical or spiritual significance. Additionally, it has been the focus of various scientific studies, including research into its effects on human.

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The ball will land 98.10 meters vertically below the point where it was thrown and the girl will find the ball 153.68 meters horizontally away from her and 98.10 meters vertically below her.

Since the ball is thrown horizontally relative to the girl, it has no vertical velocity component initially. Therefore, the only force acting on the ball after it is thrown is the force due to gravity, which causes it to follow a parabolic path.

We can use the fact that the horizontal motion of the ball is independent of the vertical motion to analyze each motion separately. Let's start with the horizontal motion:

The horizontal velocity of the ball remains constant at 34 m/s throughout its flight, so we can use the equation:

distance = speed x time

to determine the horizontal distance traveled by the ball.

We know that the ball is thrown at the same instant that the balloon is 100 m above the ground, so we can use this to find the time it takes for the ball to reach the ground.

The time taken for the ball to hit the ground is the same as the time taken for an object to fall 100 m under gravity, since they both have the same vertical acceleration due to gravity.

Using the equation:

distance = 1/2 x acceleration x time^2

with an initial velocity of 0 m/s and an acceleration of 9.8 m/s^2, we can find the time taken for the ball to hit the ground:

100 m = 1/2 x 9.8 m/s^2 x time^2

time^2 = 100 m / (1/2 x 9.8 m/s^2) = 20.41 s^2

time = sqrt(20.41 s^2) = 4.52 s (taking the positive square root)

Now we can use the horizontal distance equation to find the horizontal distance traveled by the ball during this time:

distance = speed x time = 34 m/s x 4.52 s = 153.68 m

So the ball will land 153.68 meters horizontally away from the point where it was thrown.

To find the vertical distance that the ball travels, we can use the same equation:

distance = 1/2 x acceleration x time^2

but this time with an initial velocity of 0 m/s and a time of 4.52 s (since the time taken for the ball to hit the ground is also the time taken for the balloon to descend 100 m).

Using the acceleration due to gravity of 9.8 m/s^2, we get:

distance = 1/2 x 9.8 m/s^2 x (4.52 s)^2 = 98.10 m

So the ball will land 98.10 meters vertically below the point where it was thrown.

Therefore, the girl will find the ball 153.68 meters horizontally away from her and 98.10 meters vertically below her.

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When dealing with an electrical emergency involving a downed power line, it is important to follow certain safety precautions to avoid injury or further damage.

First, stay at least 10 meters (around 33 feet) away from the downed power line and any objects that it may be touching, as they could potentially be electrified.

Next, call 911 to report the downed power line and warn others in the area to stay away.

Do not attempt to move the power line or any objects it may be touching, as this could result in serious injury or death. Wait for emergency responders to arrive and follow their instructions. Remember, safety should always be the top priority in any electrical emergency.

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Using an electric kettle, 200 g of water at 100 is converted into steam at 100 in 300 seconds, so the specific latent heat of steam is 2250 j/g, and here the average of the electrical power used by the kettle is 1500 W.

The amount of heat required to convert 200 g of water at 100 °C to steam at 100 °C is explain below,

Q = m × L (m = mass of water; L = specific latent heat of steam)

Q = 200g × 2250 J/g = 450000 J

The time to convert the water into steam = 300 seconds, thus the average power used is:

P = Q/t = 450000 J/300 s = 1500 W

Hence, here the average of the electrical power used by the kettle with  200g of water is 1500 W.

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The net force on an object is the overall force acting on it, taking into account the direction and magnitude of all the individual forces. In this case, a block is being pulled to the right with a force of 50 pounds and to the left with a force of 60 pounds.

These forces are in opposite directions, so to find the net force, we need to subtract the force acting to the left from the force acting to the right. This results in a net force of -10 pounds, indicating that there is an overall force acting on the block to the left. This net force would cause the block to accelerate in the opposite direction of the larger force .

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When a projectile is launched at an angle of 30 degrees above the horizontal, the tallest barrier it may clear is 14 meters. The correct option is (b) 33.3m/s.

we can use the kinematic equations of motion for projectile motion. The key is to recognize that the projectile will reach its maximum height when it is at the top of its trajectory, at which point its vertical velocity is zero.

First, we can use the vertical motion equation to find the time it takes for the projectile to reach its maximum height:

vy = v.sin θ - gt

0 = v sin θ - gt

t = v sin θ / g

Next, we can use the horizontal motion equation to find the horizontal distance traveled by the projectile in this time:

x = v.cos θ.t

Now, we want to find the launch speed v that will result in the maximum height of 14 m. To do this, we can substitute the expressions we just derived for t and x into the vertical motion equation for the maximum height:

h = (v sin θ)² / (2g)

Solving v:-

v = √(2gh) / sin θ

Putting values:-

v = √(2 × 9.81 m/s² × 14 m) / sin 30.0°

v ≈ 33.3 m/s

Therefore, the projectile's launch speed is approx. 33.3 m/s, which is answer choice (b).

Note that answer choices (a), (c), and (d) are all close to the correct answer, but not quite correct. This illustrates the importance of being careful with units and significant figures when performing calculations.

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Hepatitis C would be the best choice for Helena's report on an infectious disease.

HIV, hepatitis A, B, and C, measles, salmonella, measles, and blood-borne disorders are a few examples of communicable diseases. The most frequent methods of transmission are feces-oral transmission, food transmission, sexual contact, insect bites, contact with contaminated formice, droplets, or skin contact.

Direct contact between people cannot spread dengue. However, an infected and unwell dengue fever patient can transmit the illness to more mosquitoes.. It is known that during the period when the virus circulates and reproduces in the circulatory system, humans can spread the infection from one nation or region to another.

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A super-happy fun ball is thrown from a height of six feet, and it returns to the point where it was dropped. It only bounces once before rebounding less than a distance of one foot.

To solve this problem, we can use a geometric series to represent the distance traveled by the ball after each bounce.

Let's denote the height of the ball after the nth bounce as [tex]h_n[/tex]. Then we have:

[tex]h_1 = 6[/tex] (the initial height of the ball)

[tex]h_2 = 6 + 6 = 12[/tex] (the height after the first bounce)

[tex]h_3 = 6 + 6 + 6 = 18[/tex] (the height after the second bounce)

[tex]h_4 = 6 + 6 + 6 + 6 = 24[/tex] (the height after the third bounce)

and so on.

The height after the [tex]n^t^h[/tex] bounce:-

[tex]h_n = 6 * 2^(^n^-^1^)[/tex]

Now, we want to find the number of bounces that the ball will make before its rebound height is less than 1 foot. In other words, we want to find the smallest value of n such that[tex]h_n/2 < 1.[/tex] This is equivalent to:

= [tex]6 * 2^(^n^-^1^) / 2 < 1[/tex]

= [tex]3 * 2^(^n^-^1^) < 1[/tex]

= [tex]2^(^n^-^1^) < 1/3[/tex]

= [tex]n-1 < log2(1/3)[/tex]

= [tex]n < log2(1/3) + 1[/tex]

= [tex]log2(1/3) = -1.585, so n < -1.585 + 1 = -0.585[/tex].

Since n must be a positive integer, the smallest value of n that satisfies the condition is n = 1.

Therefore, the ball will bounce once before its rebound height is less than 1 foot.

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Due to the fixed ends, a wave that is propagating up the string in one direction will reflect at the end and return inverted. The standing wave on the string is created by these two similar waves moving in the opposite direction.

When two waves with the same frequency and amplitude move in opposition to one another and interfere with one another, a standing wave result.

The string's basic frequency is the lowest resonance frequency (n=1). As integer multiples of the fundamental frequency, all higher frequencies are referred to as harmonics. The strings on all stringed musical instruments are fastened at both ends.

The n frequency is related to the fundamental frequency by the eq.

[tex]f_{n}=nf_{1}[/tex]

or

[tex]f_{1}=\frac{f_{n}}{n} \: \: \: \: \: \:\: \: \: \: \: \: \: \: (1)[/tex]

besides, we know that,

[tex]f_{n+1}=(n+1)f_{1}[/tex]

or

[tex]f_{1}=\frac{f_{n+1}}{n+1} \: \: \: \: \:\: \: \: \: \: \: (2)[/tex]

matching eq. (1) to (2),

[tex]\frac{f_{n}}{n}=\frac{f_{n+1}}{n+1}[/tex]

[tex]f_{n}(n+1)=f_{n+1}n[/tex]

isolating n from this eq.,

[tex]n = \frac{f_n}{f_n+1- f_n} = \frac{15}{20- 15}[/tex]

Once got the n value, just insert in eq. (1) so you can know the fundamental frequency,

[tex]f_1= \frac{f_n}{n} = \frac{15Hz}{3} = 5Hz[/tex]

Therefore, 5Hz is the fundamental frequency.

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Well, you didn't tell us what the unit of the 53.14 is.  But whatever it is, the force of friction is the same 53.14 of them.

The only way the box can move with constant velocity is if the forces acting on it all add up to zero. So the force of friction to the left, holding it back, must be exactly equal to the force pushng it forward to the right.

Notice that none of this depends on the mass of the box, or WHAT the constant velocity IS.  None of that information matters, or makes any difference. It's only included in the question to confuse and distract us.  

The waves of muscular contractions that propel food along the gastrointestinal tract are called peristalsis.

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The number of electrons that corresponds to the number of charges is 2.71 × 10¹⁰ electrons.

The breakdown field strength of air is 3 × 10⁶ N/C, and the distance between the fingertip and the doorknob is 2 cm, so the electric field between the two is given by:

E = 3 × 10⁶ N/C

The electric field causes the charge on the fingertip to be drawn towards the doorknob, so we can calculate the charge on the fingertip using the formula:

q = 4π ε_0 x Er²

where;

r is the radius of the fingertip (0.71 cm) and

ε_0 is the permittivity of free space (8.854 × 10^-12 C^2/Nm²).

q = 4  x π  x 8.854 × 10⁻¹² x 3 × 10⁶  x  0.71²

q = 2.17 × 10⁻⁸ C

The charge on the doorknob is equal and opposite to the charge on the fingertip, so the total charge on both is calculated as;

Q_total =  2  x 2.17 × 10⁻⁸ C

= 4.34 × 10⁻⁸ C.

The number of electrons is calculated as follows;

number of electrons = q / e

where;

number of electrons = ( 4.34 × 10⁻⁸ C / 1.60218 × ⁻¹⁹ C )

number of electrons = 2.71 × 10¹⁰ electrons

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Reading on the scale will be 1130 N when the elevator accelerates upward with an acceleration of 5.2 m/s2.

Change in velocity over the change in time is acceleration and is represented by : a = Δv/Δt.

Formula to calculate the apparent weight (W') is given by:

W' = W + ma

W is true weight of the person, m is mass of the person, and a is acceleration of the elevator.

Given, W = 740 N, a = 5.2 m/s2.

W = mg

g is acceleration due to gravity, which is 9.8 m/s2.

740 N = m * 9.8 m/s2

m = 740 N / 9.8 m/s2 = 75.5 kg

W' = W + ma = 740 N + (75.5 kg)(5.2 m/s2) = 740 N + 390 N = 1130 N

So, the reading on the scale will be 1130 N when the elevator accelerates upward with an acceleration of 5.2 m/s2.

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