Help me, please.


What are the separate X & Y velocities of:


A baseball hit at 10m/s at 20 degrees above the horizon, up and to the right?

A football thrown straight up at 100m/s?

A tennis ball thrown perfectly to the right off a cliff at 15m/s?

The maximum shear stress at 18 degrees and the primary stress, respectively, are both 36.05 mpa.

The Mohr method is a very useful tool for finding primary stress, maximum shear stress, principle plane, or angle of the action. It is a technique that plots a circle using a graphical way in order to gather the necessary information.

Shear stress= 30

Tensile stress= 40

Compressive Stress= -40

Mohr circle using data is:

Figure

And the principal stress will be 36.05 mpa and maximum shear stress would be 36.05 mpa at 18 degrees.

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As the frequency of a wave decreases, the wavelength increases, and the energy decreases.

The wavelength and energy of a wave are inversely proportional, meaning that as one increases, the other decreases, and vice versa.

In the case of a wave, as the frequency decreases, the wavelength increases. This is ecause the speed of a wave is constant, and it is equal to the frequency multiplied by the wavelength (v = fλ). As the frequency decreases, the wavelength must increase in order to keep the product (v) constant.

At the same time, as the frequency decreases, the energy of the wave decreases as well. This is because the energy of a wave is proportional to the square of its frequency (E ∝ f^2). As the frequency decreases, the energy decreases in proportion to the square of the decrease in frequency.

Therefore, as the frequency of a wave decreases, the wavelength increases, and the energy decreases.

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The value of a is calculated to be -1 from the equation of linear combination of vectors.

The given vectors are,

v = <−3 −1>, w = <−2 −3 >, u = <−3 −8 >

To find the value of a substitute the value of the vectors in the given equation,

u = av + bw

<-3, -8 > = a <-3, -1> + b <-2, -3>

The vector can be written as follows,

-3a -2b = -3 ----(1)

-a -3b = -8 ----(2)

Solving the equations, we have

-3a -2b = -3  

a + 3b = 8 ⇒ 3a +9b = 24

7 b = 21

b = 3 and a = -1

Thus, the value of a is determined to be -1.

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The size of an atom is primarily determined by the size of its electron cloud, which is much larger than the size of its nucleus.

The diameter of an atom can be estimated using the Bohr model, which states that the electron orbits the nucleus at a distance proportional to the square of the principal quantum number. For a hydrogen atom, the most basic and simplest atom, the radius of the first orbital is approximately 0.0529 nanometers.

To convert this value to feet, we can use the conversion factor of 1 foot = 30.48 cm = 30.48 x 10^-2 m = 30.48 x 10^8 nm. Therefore, the diameter of a hydrogen atom in feet can be estimated as:

2 * 0.0529 nm * (30.48 x 10^8 nm/foot) = 3.29 x 10^-10 feet

Note that this is an estimate and the actual size of an atom may vary slightly depending on the atom's structure and the conditions in which it is observed. However, this estimate can give us a rough idea of the scale of an atom in comparison to a pencil eraser, which is much larger.

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The statement that best describes what happened to the wave is D. the wave was transmitted through the object

A wave is a dynamic disturbance of one or more quantities that propagates through time. Quantities may oscillate repeatedly around an equilibrium value at a certain frequency if waves are periodic.

Hence, because it is stated that the wave was traveling through air and met an object and passes through it with no change in speed, energy, or direction, this means it was transmitted through the object

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A wave traveling through air meets an object and passes through it with no

change in speed, energy, or direction. Which statement best describes what

has happened to the wave?

O A. The wave was absorbed by the object.

O B. The object's surface reflected the wave.

O C. The object caused the wave to refract.

O D. The wave was transmitted through the object.

It is possible to receive a severe electrical shock from an ordinary outlet that would prevent a person from releasing the wire with dry hands, but it is not likely.

Our body depends on neurons to receive and transmit any signals. The sodium concentration in our body is disturbed by any external stimuli, and it instigates the neurons to send electric impulses in the brain.

Upon interpreting, the brain sends back signals to the muscles connected by neurons. When a person gets a severe shock, the signal gets disturbed, and a huge surge of electricity reaches the brain. This causes the brain to send reflex stimuli for the contraction of the muscle in the palm. Thus, the person will be unable to leave the wire even if he has dry hands.

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Without more information, it is impossible to estimate the light output of the stage, which has six gels covering the spotlight.

However, without knowing more about the exponential relationship and the characteristics of the gels, it is impossible to precisely calculate the intensity of the light on stage with six gels over the spotlight. The statement that the temperature decays exponentially with the thickness of material covering it may imply that the intensity of light is proportional to the exponential of the thickness of material. It would be important to know more about how the exponential decrease of temperature and the thickness of the material relate in order to calculate the intensity. Additionally, the gels' characteristics, such as their optical characteristics, may also be important in

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Coefficient of volume expansion be for this metal is 7.66×10⁻⁵ K⁻¹

From the question,

γ = (v₂-v₁)/[v₁(t₂-t₁)]....................... Equation 1

Where γ = coefficient of volume expansion, v₁ = initial volume, v₂ = Final volume, t₁ = initial temperature, t₂ = Final Temperature.

Given: v₁ = 26.1 cm³, v₂ = 26.2 cm³, t₁ = 25 °C, t₂ = 75 °C.

Substitute these values into equation 1

γ = (26.2-26.1)/[26.1(75-25)]

γ = 0.1/(26.1×50)

γ = 0.1/1305

γ = 7.66×10⁻⁵ K⁻¹

In general, all substances expand when heated, except for water at temperatures between 0oC and 4oC, their volume decreases. Expansion of the substance generally occurs in all directions, towards the length, towards the width and towards the thickness. However, in certain discussions we may only look at expansion in one particular direction, for example in the direction of length, so we only discuss length expansion.

For liquids, because the shape is not certain, we only discuss the volume expansion. As for solids, which have a fixed shape, then in the expansion of solids we can discuss the expansion of length, area expansion and volume expansion.

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W = fd means that the work is equal to the force f times the distance d. The work is W = fd cosФ if the force is applied at an angle of Ф to the displacement.

Work is a unit of energy that is generated when a force is applied to the body and the body is moved. The Joule is the SI unit of work.

A displacement and the force that triggered it are necessary for a force to be considered to have accomplished work on an item.

The displacement of the body: At constant load and constant angle between force and displacement, work is directly proportional to the displacement.

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The work formula is used to calculate the amount of energy required to move an object a certain distance.

Energy is a fundamental concept in physics. It is defined as the capacity for doing work or the ability to produce change. Energy can be found in many forms, such as thermal, kinetic, chemical, electrical, gravitational, and nuclear. It can be converted from one form to another and can be transferred from one object to another. Energy is neither created nor destroyed, but can be changed from one form to another. This concept is known as the law of conservation of energy. In physics, energy is used to describe the ability to do work.

It is expressed as the multiplication of the magnitude of displacement (d) and the component of the force (F) acting on the object. The angle θ is the angle between the direction of the force and the direction of the displacement. The cosine of this angle (cosθ) is used to account for the fact that the force does not always act in the same direction as the displacement. The work formula can be expressed
as:  W = F × d × cosθ.

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The magnitude of the electric field is E = 8.99 * 10^9 * (-50 * 10^-9) / x^2. The direction of the electric field at any point x is towards the origin.

The electric field at points on the x-axis due to a -50 nC charge placed at the origin is directed towards the origin, and its magnitude is given by => E = k x q / r^2,

here k is the Coulomb's constant (k = 8.99 * 10^9 Nm^2/C^2),

q is the magnitude of the charge (-50 nC),

and r is the distance from the origin.

At any point x on the x-axis, the magnitude of the electric field is

=> E = 8.99 x 10^9 x (-50 x 10^-9) / x^2.

The direction of the electric field at any point x is towards the origin.

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The fundamental pitch of an organ pipe is determined by the length of the pipe and the velocity of sound in the material that the pipe is made of.

For a pipe with one open end and one closed end, the fundamental pitch (f) can be calculated using the formula:

f = v / (4 * L)

where v is the velocity of sound in the material, and L is the length of the pipe.

For a 34.3 cm long pipe, the fundamental pitch can be calculated as follows:

f = v / (4 * 0.343 m)

Note that the length of the pipe needs to be converted from centimeters to meters.

The velocity of sound in air at room temperature is approximately 343 m/s, but this value can vary slightly based on the temperature and pressure of the air. The velocity of sound in other materials will be different.

Once the velocity of sound in the material has been determined, the fundamental pitch can be calculated by substituting this value into the formula.

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At the instant when the bottom of the ladder is 12 feet from the wall, the area of the triangle is decreasing at a rate of 30 square feet per second.

The area of the triangle is equal to 1/2 the product of the height of the wall and the distance from the bottom of the ladder to the wall. If the height of the wall is h and the distance from the bottom of the ladder to the wall is x, then the area of the triangle is:

A = 1/2 * h * x

Differentiating with respect to time t, we can find the rate of change in the area:

dA/dt = 1/2 * dh/dt * x + 1/2 * h * dx/dt

At the instant when the bottom of the ladder is 12 feet from the wall, h = 15 feet and x = 12 feet, so dh/dt = 0 (the height of the wall does not change with time) and dx/dt = -4 feet/second.

Plugging in these values gives:

dA/dt = 1/2 * 0 * 12 + 1/2 * 15 * -4 = -30 square feet per second

So, at the instant when the bottom of the ladder is 12 feet from the wall, the area of the triangle is decreasing at a rate of 30 square feet per second.

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The solar calendar is based on the earth's orbit around the sun, with a year being 365 or 366 days long, depending on whether it's a leap year. The lunar calendar is based on the phases of the moon, with a month being 29.5 or 29.53 days long.

The solar calendar has a fixed year length, while the lunar calendar has 12 or 13 lunar months in a year, which is about 11 days shorter than a solar year. The difference between the two calendars leads to the occurrence of lunar holidays like the Islamic and Jewish calendars, which drift through the solar calendar year. The solar calendar is used in most countries around the world, while the lunar calendar is still used in some countries, especially those with religious traditions linked to the phases of the moon.

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The energy of the car at the bottom of the hill, given that it has a velocity of 10 m/s is 40000 J

We know that kinetic energy is the energy of moving objects and it is defined according to the following formula:

KE = ½mv²

Where

With the above formula, we can obtain the energy of the car at the bottom. Details below:

KE = ½mv²

KE = ½ × 800 × 10²

KE = 400 × 100

KE = 40000 J

Thus, the energy at the bottom is 40000 J

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The initial speed of the first ball must be 19.6 m/s if both are to hit the ground at the same time.

The time it takes for a ball to fall from a height h to the ground can be calculated using the formula:

t = √(2h / g)

where:

   t is the time it takes for the ball to fall

   h is the height of the building (19.2 m)

   g is the acceleration due to gravity (9.8 m/s^2)

So, the time it takes for the first ball to fall 19.2 m is:

t = √(2 * 19.2 m / 9.8 m/s^2) ≈ 2.67 s

Since both balls must hit the ground at the same time, the time for the second ball to fall the same distance must also be 2.67 s.

The initial velocity of an object that falls for a time t from a height h can be calculated using the formula:

v = √(2gh)

where:

   v is the initial velocity of the ball

   h is the height of the building (19.2 m)

   g is the acceleration due to gravity (9.8 m/s^2)

So, the initial velocity of the first ball must be:

v = √(2 * 9.8 m/s^2 * 19.2 m) ≈ 19.6 m/s is the initial speed of the first ball.

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The statement that's true about the tire pressure (in pounds per square inch) of tires in different cars is the data are continuous because the data can take on any value in an interval (option D)

When we measure tire pressure in a car, we are working with a continuous variable. From 0 psi to a high value that would cause the tire to burst, the air pressure can range in value.

There are an infinite number of additional valid values for a continuous variable between any two values, which can be used to distinguish it from discrete variables. Contrary to popular belief, discrete variables have an integer number (0, 1, 2,...) of possible values between any two discrete values. These are regarded as countable values for a discrete variable because there are an infinite number of them.

The distinction between discrete and continuous data is that the former only accepts whole numbers as values, while the latter accepts any value along an interval. Because they can take any value on the interval, the tire pressures on various cars represent continuous data.

The question is incomplete, it should be:

State whether the data described below are discrete or continuous, and explain why. The tire pressures (in pounds per square inch) of tires on different cars Choose the correct answer below. A. The data are continuous because the data can only take on specific values. B. The data are discrete because the data can take on any value in an interval. C. The data are discrete because the data can only take on spacific values. D. The data are continuous because the data can take on any value in an interval.

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The amplitude of the motion is 0.375 m.

The amplitude of the motion can be found using the formula:

[tex]E = \frac{1}{2} kA^2[/tex]

where E is the total energy of the system, k is the spring constant, and A is the amplitude.

We can find k using the formula:

[tex]k = \frac{2\pi^2m}{T^2}[/tex]

where m is the mass of the object and T is the period of the motion.

Substituting the values in the formula for k, we get:

[tex]k = (2 \pi ^2 * 0.343 kg) / (0.92 s)^2 = 2.76 N/m[/tex]

Now that we have k, we can find the amplitude by substituting k and E in the formula for E:

[tex]A = \sqrt{2E/k} = √(2 * 1.3 J / 2.76 N/m) = 0.375 m.[/tex]

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K=U when the kinetic energy of an object is equal to its potential energy. This occurs when the object is at the top of its trajectory, where the potential energy is at its maximum, and the kinetic energy is at its minimum.

The energy is the capacity of a physical system to perform work. It is an essential resource for the functioning of many systems and processes on the planet, and it can take many forms, such as kinetic, potential, thermal, electrical, chemical, nuclear, and more. Energy is converted from one form to another depending on the needs of the system and can be used to power various activities, from everyday life to complex industrial processes.

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Three types of plate motion are convergence, divergence, and transformation. Convergence is the movement of plates into one another; divergence is the movement of plates apart.

Three different types of continental boundaries are produced by the movement of the plates: convergent boundaries, where plates move toward one another; divergent boundaries, whereby plates move apart; & transform boundaries, where plates move laterally with respect to one another.

Greek term tekton, which means builder, is the origin of the word "tectonics." The deformation of the lithosphere, or solid portion of the earth's crust, is a subject of study in the science of geology, including both its causes and effects.

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Weber's Law is a principle in psychology that states that the difference threshold, or just noticeable difference (JND), between two stimuli is proportional to the magnitude of the stimuli. In other words, the greater the weight, the more weight is needed to be added for the change to be noticeable.

Applying this to Samson's weightlifting, we can calculate the JND by using the formula JND = k * stimulus, where k is a constant of proportionality known as Weber's fraction. In this case, the stimulus would be 240 pounds, the weight that Samson typically lifts.

A commonly used value for Weber's fraction in weightlifting is 0.2, meaning that the JND is 20% of the stimulus. So, for Samson, the JND would be 240 * 0.2 = 48 pounds. This means that for Samson to notice an increase in weight beyond 240 pounds, the weight would need to be increased by at least 48 pounds.

Therefore, if Samson wants to sense an increase in weight, he would need to lift a minimum of 240 + 48 = 288 pounds. However, it is important to keep in mind that the Weber's fraction may vary between individuals, and it may also depend on the specific task and the individual's level of experience and sensitivity.

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You need a capacitance of 6.00 μF to store 60.0 μC of charge using  single 10.0-V battery.

The amount of charge that can be stored at a given voltage by an electrical component is called a capacitor. The unit of capacitance is Farad (F) and 1F capacitor charged to 1V will hold one Coulomb of charge.

Capacitance, C, can be calculated as :

C = Q / V = 60.0 μC / 10.0 V = 6.00 μF

So, you need a capacitance of 6.00 μF to store 60.0 μC of charge using a single 10.0-V battery.

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The magnitude of difference and angle is 86.48°.

To find the magnitude of the difference between two vectors, subtract the magnitude of the smaller vector from the magnitude of the larger vector. The magnitude of the larger vector is 10 cm and the magnitude of the smaller vector is 8 cm, so the magnitude of the difference is 10 - 8 = 2 cm.

To find the angle with respect to the larger vector, use the dot product. Let's denote the larger vector as A and the smaller vector as B. The dot product of A and B is given by: A•B = |A||B|cos(Θ)

Where Θ is the angle between the two vectors. From the problem, the angle between the two vectors is 60 degrees, so substitute that value into the equation:

A•B = 10 x 8 x cos(60)

A•B = 10 x 8 x 0.5

A•B = 40

Now, find the angle Θ between the difference vector (A - B) and the larger vector (A) by using the dot product formula:

(A - B)•A = |A - B||A|cos(Θ)

Simplify this expression by substituting the known values:

(A - B)•A = 2 x 10 x cos(Θ)

Divide both sides by 20 to isolate cos(Θ):

cos(Θ) = (A - B)•A / (2 x 10)

cos(Θ) = (A - B)•A / 20

cos(Θ) = (A•A - B•A) / 20

cos(Θ) = (A•A - (A•B / |A|)) / 20

cos(Θ) = (A•A - (40 / 10)) / 20

cos(Θ) = (A•A - 4) / 20

cos(Θ) = (100 - 4) / 20

cos(Θ) = 96 / 20

cos(Θ) = 4.8

Finally, we can use the inverse cosine function to find the angle Θ:

Θ = acos(cos(Θ))

Θ = acos(4.8)

The angle Θ is approximately 86.48°, which is with respect to the larger vector.

In summary, the magnitude of the difference between the two vectors is 2 cm and the angle with respect to the larger vector is approximately 86.48°.

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The statement is correct. Steelhead trout are capable of jumping at a speed of 8.0 m/s, which allows them to clear small waterfalls during their upstream migration to spawn.

Steelhead trout are fish species that migrate upstream to reproduce. During their journey, they may encounter small waterfalls that they need to overcome to continue their migration. Steelhead trout have a remarkable jumping ability, which allows them to leave the water at a speed of 8.0 m/s. This is a key adaptation that enables steelhead trout to overcome obstacles and complete their journey to reproduce. Steelhead trout are also known for their strong swimming ability, which helps them navigate upstream and find suitable spawning grounds. These adaptations make steelhead trout well-suited to their freshwater environment and contribute to their success as a species.

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1- The amount of heat added at constant pressure: The amount of heat added at constant pressure can be calculated by using the formula qp = cv(T2 - T1).

Constant pressure is a type of pressure that remains the same even when external forces are applied to it. It is also known as unchanging pressure or steady pressure. Constant pressure is usually measured with a barometer, which is a device used to measure atmospheric pressure. Constant pressure is most commonly seen in the form of air pressure, which is the pressure of the air around us. It is important to note that although the pressure remains constant, the temperature and density of the air can change. Constant pressure is essential for a variety of applications, such as in aircraft, where the air pressure in the cabin must remain constant for the comfort of the passengers.

In this case, qp = 0.719 kJ/kg.K (2200 - 273) = 1418.7 kJ/kg. 2- The amount of heat added at constant volume: The amount of heat added at constant volume can be calculated by using the formula qv = cp(T2 - T1). In this case, qv = 1.007 kJ/kg.K (2200 - 273) = 1810.7 kJ/kg. 3- The net work done by the cycle: The net work done by the cycle can be calculated by using the formula Wnet = qp - qv. In this case, Wnet = 1418.7 - 1810.7 = -392 kJ/kg. 4- The thermal efficiency of the cycle: The thermal efficiency of the cycle can be calculated by using the formula nth = (Wnet/qp) x 100. In this case, nth = (-392/1418.7) x 100 = -27.6%. 5- The mean effective pressure: The mean effective pressure can be calculated by using the formula m = (2/1-r) x (P2/P1). In this case, m = (2/1-18) x (2200/100) = 733.3 kPa.

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The statement, v in r 3 and v · v = 0, then v is the zero vector, is true.

In linear algebra, a vector v in R^3 (which means a 3-dimensional real vector space) is said to be a zero vector if all its components are equal to zero. This vector is also known as the null vector or null element and is denoted by the symbol 0.

The dot product of two vectors, denoted by v · v, is a scalar quantity that measures the cosine of the angle between two vectors. If the dot product of a vector with itself is equal to zero, it means that the cosine of the angle between the two vectors is zero, which implies that the two vectors are orthogonal (i.e., they are at right angles to each other).

Therefore, if v · v = 0, it follows that the vector v is orthogonal to itself, which is possible only if all its components are equal to zero. Hence, in this case, v must be the zero vector.

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The elastic constant for the spring is 205,7 N/m. The result is obtained by using the formula in Hooke's law.

The Hooke's Law states that the restoring force of a spring equals the spring constant times the change in length. It can be expressed as

F = - kΔx

Where

Note: the minus sign is used to indicate that F is in the opposite direction to the displacement of a free end.

A certain spring has

Find the elastic constant!

Using the equation apply in Hooke's law, the elastic constant is

F = kΔx

72 = k(0.35)

k = 72/0.35

k = 205,7 N/m

Hence, the magnitude of the spring elastic constant is 205,7 N/m.

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The speed of the southbound boat is 6 mph.

Acceleration or a rapid rate of motion are most frequently described as speed. When something accelerates too quickly, it may veer off course, similar to a child riding a bike down a steep hill in an uncontrollable manner.

Let speed of southbound boat be X mph

So speed of eastbound boat =X+2 mph

After 5 hrs, south boat has travelled 5X miles & east boat has travelled 5× (X+2) = 5X+10 miles

(5X)^2 + (5X+10)^2 = 50^2

25X^2 + 25X^2 + 100 + 100X = 2500

Or 50X^2 + 100X-2400 = 0

Or X^2+2X-48=0

(X-6)(X+8)=0

we get X=6 mph

Thus, the speed of the southbound boat is 6 mph.

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Compounds with a limited solubility in water and a high vapour pressure are known as volatile organic compounds. Many VOCs are compounds created by humans and employed in the production of paints, medications, and refrigerants

Thus, VOCs are often fuel oxygenates like methyl tert-butyl ether (MTBE), industrial solvents like trichloroethylene, or byproducts of chlorination in water treatment like chloroform and solubility.

Petroleum fuels, hydraulic fluids, paint thinners, and dry cleaning products all frequently include VOCs. VOCs are typical pollutants in groundwater.

Certain solids or liquids emit volatile organic compounds (VOCs) as gases. Many different compounds are included in VOCs, some of which may have negative short- and long-term health impacts.

Thus, Compounds with a limited solubility in water and a high vapour pressure are known as volatile organic compounds. Many VOCs are compounds created by humans and employed in the production of paints, medications, and refrigerants.

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As the frequency of vibration of the wave generator increases, the wavelength of the waves will decrease.

Waves are unsettling influences that movement through a medium, like water or air, and move energy without the exchange of mass. The recurrence of a wave alludes to the quantity of complete wave cycles that happen in a unit of time, normally estimated in Hertz (Hz). At the point when the recurrence of a wave generator expands, the frequency of the subsequent waves diminishes. This is on the grounds that the frequency is the distance between two successive pinnacles (or box) of a wave. In the event that the recurrence builds, there are more tops in a given unit of time, and that implies the distance between them should diminish. Subsequently, the frequency of the waves diminishes.

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The required mass of the rover when weight and gravitational acceleration is calculated to be 33.17 lb s²/ft.

The rover’s mass is the same on Earth and Mars. Its mass is 408 lb and gravitational acceleration is 12.3 ft/s2 on Earth.

We know the equation of weight as, W = m g

Making m as subject, m = W/g

Substitute 408 lb as W and 12.3 ft/s² in the above relation and obtain the mass of the rover as follows:

m = W/g = (408 lb)/(12.3 ft/s²) = 33.17 lb.s²/ft

Thus, the mass of the rover is calculated as 33.17 lb.s²/ft.

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