1. A block of wood floats in water with 0.6m in projecting above the surface. When placed in glycerin of specific gravity 1.35, the block projects 0.25m in above the liquid surface. Determine a) the specific gravity of the wood b) the density of wood ​

The magnitude of the equilibrant force is equal in magnitude but opposite in direction to the resultant vector R. Therefore, the magnitude of the equilibrant force is 500 dyne.

The correct answer is option D.

To find the magnitude of the equilibrant force, we need to determine the resultant of the two given forces and then find its opposite vector, which will be the equilibrant force.

Let's break down each force into its x-component and y-component:

For F1 = 300 dyne at an angle of 309° with the +x-axis:

F1x = F1 * cos(309°)

= 300 dyne * cos(309°)

= -259.8 dyne (negative because it is in the opposite direction of the positive x-axis)

F1y = F1 * sin(309°)

= 300 dyne * sin(309°)

= -150 dyne (negative because it is in the opposite direction of the positive y-axis)

For F2 = 400 dyne at an angle of 120° with the +x-axis:

F2x = F2 * cos(120°)

= 400 dyne * cos(120°)

= -200 dyne (negative because it is in the opposite direction of the positive x-axis)

F2y = F2 * sin(120°)

= 400 dyne * sin(120°)

= 346.4 dyne

Now, we can add the x-components and y-components separately:

Rx = F1x + F2x

= -259.8 dyne + (-200 dyne)

= -459.8 dyne

Ry = F1y + F2y

= -150 dyne + 346.4 dyne

= 196.4 dyne

The resultant vector R is given by:

R =[tex]\sqrt{(Rx^2 + Ry^2)}[/tex]

= [tex]\sqrt{((-459.8 dyne)^2 + (196.4 dyne)^2)\\}[/tex]

≈ 500 dyne

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The hiker travelled 4.02 km North/South and 4.74 km East/West during her hike.

This question involves vector addition, the resolution of vectors, the use of bearings, and trigonometry in the calculation of the hiker's movement.

This may appear to be a difficult problem, but with some visual aid and the proper use of mathematical formulas, the issue can be addressed correctly.

Resolution of VectorThe resolution of a vector is the process of dividing it into two or more components.

The angle between the resultant and the given vector is equal to the inverse tangent of the two rectangular components.

Angles will always be expressed in degrees in the solution.

The sine, cosine, and tangent functions in trigonometry are denoted by sin, cos, and tan.

The tangent function can be calculated using the sine and cosine functions as tan x = sin x/cos x. Also, in right-angled triangles, Pythagoras’ theorem is used to find the hypotenuse or one of the legs.

Distance Travelled North/SouthThe hiker traveled North for the first part of the hike and South for the second.

The angles that the hiker traveled in the first part and second parts are 53 degrees and 17 degrees, respectively.

The angle between the two is (180 - 53 - 17) = 110 degrees.

The angle between the resultant and the Northern direction is 110 - 53 = 57 degrees.

Using sine and cosine, we can calculate the north/south distance traveled to be 5 sin 57 = 4.02 km, and the east/west distance to be 5 cos 57 = 2.93 km.

Distance Travelled East/WestThe hiker walked East for the second part of the hike.

To calculate the distance travelled East/West, we must first calculate the component of the first part that was East/West.

The angle between the vector and the Eastern direction is 90 - 53 = 37 degrees.

Using sine and cosine, we can calculate that the distance travelled East/West for the first part of the hike is 5 cos 37 = 3.88 km.

To determine the net distance travelled East/West, we must combine this component with the distance travelled East/West in the second part of the hike.

The angle between the second vector and the Eastern direction is 17 degrees.

Using sine and cosine, we can calculate the distance traveled East/West to be 3 sin 17 = 0.86 km.

The net distance traveled East/West is 3.88 + 0.86 = 4.74 km.

Therefore, the hiker travelled 4.02 km North/South and 4.74 km East/West during her hike.

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The Title of the interviews Questionnaire is : Community Members' Right to Safe and Healthy Living Questionnaire. The Questionnaire is attached.

A tool for research known as a questionnaire comprises a series of questions formulated to extract data from individuals or a collective of individuals. A systematic approach in acquiring data, which permits researchers to obtain uniform feedback and perspectives from respondents, is termed as structured data collection.

Questionnaires have multiple applications such as conducting surveys, holding interviews, performing assessments, and carrying out evaluations.

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The temperature range, from the highest to the lowest, is generally greater for land compared to the oceans. This occurs due to several factors.

Firstly, land has lower heat capacity than water. Heat capacity refers to the amount of heat energy required to raise the temperature of a substance.

Since land has a lower heat capacity, it heats up and cools down more quickly compared to water. As a result, land temperatures can experience more significant fluctuations throughout the day and across seasons.

Secondly, land surfaces are exposed to direct solar radiation, whereas the oceans have a moderating effect due to their vastness and water's ability to distribute and store heat. The high specific heat of water enables it to absorb and release heat more slowly, resulting in a more stable temperature range.

Additionally, land surfaces are influenced by various geographical features such as mountains, valleys, and different types of land cover (forests, deserts, etc.). These features can create local temperature variations, further contributing to a wider temperature range on land.

In summary, the temperature range is typically greater for land compared to the oceans due to the lower heat capacity of land, the direct exposure to solar radiation, and the influence of geographical features.

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The electric field at the midpoint between the two charges is  determined as + 4.4 x 10⁸ N/C.

The electric field at the midpoint between the two charges is calculated as follows;

E = F/Q

E = kQ/r²

where;

The distance at midpoint between the charges is calculated as follows;

d = r/2 = 3 cm / 2 = 1.5 cm = 0.015 m

E = E₁  +  E₂

E = ( 28 x 10⁻⁶ x 9 x 10⁹ )/(0.015²) + (-17 x 10⁻⁶ x 9 x 10⁹ ) / ( 0.015² )

E = 1.12 x 10⁹  - 6.8 x 10⁸

E = 4.4 x 10⁸ N/C

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The angular acceleration of the ball is approximately 800 rad/s².  the angular acceleration of the soccer ball is approximately -35.89 rad/s².

Question 1:

To find the angular acceleration of the ball rolling down the incline, we can use the following formula:

v = ω * r

where:

v is the linear velocity (2.0 m/s),

ω is the angular velocity, and

r is the radius of the ball (0.05 m).

We can also use the formula to relate linear and angular acceleration:

a = α * r

where:

a is the linear acceleration,

α is the angular acceleration, and

r is the radius of the ball (0.05 m).

Given that the ball rolls down the incline from rest, the initial angular velocity (ω0) is zero.

Using the equations above, we have:

2.0 m/s = ω * 0.05 m

ω = 2.0 m/s / 0.05 m

ω = 40 rad/s

Since the initial angular velocity is zero, the change in angular velocity (Δω) is equal to the final angular velocity (ω).

Using the equation a = α * r, we can rewrite it as α = a / r:

α = ω / r

α = 40 rad/s / 0.05 m

α ≈ 800 rad/s²

Question 2:

To calculate the time the soccer ball was rolling, we can use the formula:

t = d / v

where:

t is the time,

d is the distance traveled (25.0 m), and

v is the linear velocity (circumference of the ball times the angular velocity).

The circumference of the ball (C) can be calculated using the formula:

C = π * d

where:

d is the diameter of the ball (0.20 m).

Given that the ball has a diameter of 20 cm, the circumference is:

C = π * 0.20 m

C ≈ 0.628 m

Using the formula v = C * ω, we have:

v = 0.628 m * 15 rev/s

v ≈ 9.42 m/s

Substituting the values into the equation t = d / v, we find:

t = 25.0 m / 9.42 m/s

t ≈ 2.66 s

Therefore, the soccer ball was rolling for approximately 2.66 seconds.

To find the angular acceleration, we can use the formula:

α = Δω / t

Given that the initial angular velocity (ω0) is 15 rev/s and the final angular velocity (ω) is zero, the change in angular velocity (Δω) is:

Δω = ω - ω0

Δω = 0 - 15 rev/s

Δω = -15 rev/s

Converting the change in angular velocity to radians per second (rad/s):

Δω = -15 rev/s * (2π rad/rev)

Δω = -30π rad/s

Substituting the values into the formula α = Δω / t, we find:

α = (-30π rad/s) / 2.66 s

α ≈ -35.89 rad/s²

Note that the negative sign indicates a deceleration or slowing down of the rotation.

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Lower frequencies (red) move faster in a glass prism than higher frequencies.

Light of all colors moves at the same speed in a vacuum. However, light travels at different speeds in many media, including water.

Red light moves through glass at the fastest speed, whereas violet light moves at the slowest speed.

Red light bends the least of all the colors because it moves at the fastest speed, whereas violet light moves at the slowest speed and bends the most.

Wavelength and speed are directly proportional. Speed also rises with increasing wavelength. Light that has a maximal wavelength therefore moves at its fastest.

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The component of soil that has very small grains and is sticky when wet is option A. clay.

Clay particles are the smallest among the soil particles, with a size of less than 0.002 millimeters. Due to their small size, clay particles have a large surface area relative to their volume, which contributes to their unique properties. When clay soil comes into contact with water, the water molecules adhere to the surface of the clay particles, forming a thin film around them.

This results in the stickiness and plasticity of clay when wet. The adhesive properties of water to the clay surface are due to the presence of charged particles on the surface of the clay particles, known as cation exchange capacity. This allows the clay particles to attract and hold onto water molecules, creating a cohesive and sticky texture.

In addition to its stickiness, clay also has a high capacity for retaining water. The small spaces between clay particles, called micropores, can hold water tightly, making it less prone to drainage. This property can be advantageous for plants as it provides a reservoir of moisture for their roots. Therefore, the correct answer is option A.

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The acceleration of the object in the inclined plane is g sinθ.

The velocity of the object on the inclined plane is √(2gL sinθ).

Given that the inclined surface is a frictionless surface. So, the force of friction is zero. Hence the components of the weight of the object provides the necessary forces to slide the object over the inclined plane.

a) Newton's second law is applied to masses on inclination.

Acceleration due to multiplied by the sine of the angle of inclination provides the acceleration for a frictionless slope of angle in degrees.

The acceleration of the object in the inclined plane is,

a = g sinθ

b) Applying the third equation of motion,

v²- u² = 2as

v² = 2as

v² = 2 x g sinθ x L

Therefore, the velocity of the object on the inclined plane is given by,

v = √(2gL sinθ)

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The main goal of a student bullying survey is to identify and quantify many aspects, including rates of bullying, student and staff attitudes towards bullying, the types of bullying, and more in order to tackle them.

Over 70% of young people say they have witnessed bullying take place in their school, according to StopBullying.gov, a website run by the U.S. Department of Health & Human Services. Nearly 50% of students in grades 4 through 12 reported experiencing bullying in a given month.

The two most prevalent kinds of bullying are verbal and social, which can take the form of name-calling, mocking, rumours, property theft, sexual comments and gestures, or even physical assault.

Social bullying occurs more frequently than physical bullying, and cyberbullying, while it is on the rise, is still less common.

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Let the circumference of the circle be 10L.

A moves at 10L/2 = 5L per hour

B moves at 10L/5 = 2L per hour

Therefore it takes 10L/(5L+2L) = 10/7 hours

Hooke's law is a crucial concept in civil engineering as it relates to materials' behavior under mechanical stress. It establishes a linear relationship between the force applied to an elastic material and the resulting deformation or strain experienced by the material. The law states that deformation is directly proportional to the applied force, as long as the material remains within its elastic limits.

In civil engineering, Hooke's law is significant for several reasons:

Structural Analysis: Hooke's law helps engineers analyze structures and materials under various loads. By understanding how materials deform under stress, engineers can accurately predict structure responses, such as beams, columns, and bridges. This will ensure their safety and stability.

Material Selection: Hooke's law assists civil engineers in selecting appropriate materials for construction projects. It provides insights into materials' mechanical properties, such as elasticity, strength, and stiffness. These are essential considerations in designing structures that withstand anticipated loads.

Design of Elements: Hooke's law is utilized in the design of structural elements to ensure they can withstand expected forces and deformations. By considering materials' elastic behavior, engineers can calculate the required dimensions, reinforcement, and support systems to prevent excessive deformations or failures.

Structural Testing: Hooke's law guides materials and structural component testing and evaluation. Engineers can conduct experiments to measure elastic properties of materials, such as Young's modulus, Poisson's ratio, and shear modulus. This is done by applying known forces and measuring the resulting deformations. These tests validate design assumptions and ensure safety standards compliance.

Load Distribution: Hooke's law helps understand how loads are distributed within a structure. By considering materials' elasticity, engineers can determine how forces are transmitted through structural elements. This allows for an optimized design that efficiently distributes loads and minimizes stress concentrations.

Hooke's law provides a fundamental framework for analyzing materials and structures' behavior under mechanical stress. This enables civil engineers to design and construct safe, efficient, and reliable infrastructure.

(1/2)mv^2 = (1/2) * 100 * (2*3)^2 = 1800 [J]

The frequency of electromagnetic radiation with a wavelength of 3.6 x 10⁻⁷ m is approximately 8.33 x 10¹⁴ Hz.

Given information,

Speed of light = 3.0 x 10⁸ m/s

Wavelength = 3.6 x 10⁻⁷ m

To determine the frequency of electromagnetic radiation with a given wavelength, the formula that can be used: c = λ × ν

Where:

c is the speed of light

λ is the wavelength of the radiation

ν is the frequency of the radiation

Now,

ν = c / λ

ν = (3.0 x 10⁸ m/s) / (3.6 x 10⁻⁷ m)

ν ≈ 8.33 x 10¹⁴ Hz

Therefore, the frequency of electromagnetic radiation is approximately 8.33 x 10¹⁴ Hz.

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A. We deduce here that the resistance of the copper wire at 20°C is 7.58 Ω.

B. The new temperature =  20.833°C.

The resistance of a wire is:

R = ρL/A

where:

R is the resistance in ohms

ρ is the resistivity of the material in ohm-meters = 1.72 x 10-8 Ωm

L is the length of the wire in meters = 200 m

A is the cross-sectional area of the wire in square meters = πr² = π(0.25 mm)² = 4.909 x 10^-7 m²

Thus,

R = 1.72 x 10-8 Ωm x  200 m / 4.909 x 10^-7 m² = 7.58 Ω

B. The new temperature:

The temperature coefficient of resistance (α) is a measure of how much the resistance of a material changes with temperature.

For aluminum, α = 0.0039/°C. This means that for every 1°C increase in temperature, the resistance of aluminum increases by 0.0039 Ω.

T = 20°C + (900 Ω - 600 Ω) / 600 Ω α

T = 20°C + (300 Ω) / (600 Ω) (0.0039/°C)

T = 20°C + 0.0065°C

T = 20.833°C

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Let the circumference of the circle be 10L.

A moves at 10L/2 = 5L per hour

B moves at 10L/5 = 2L per hour

Therefore it will take them 10L/(5L+2L) = 10/7 hours to meet

1. Fossil Record

2. Comparative Anatomy

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The flow of electrons or charges gives the current flow in the conductor. The atom is made up of electrons, protons, and neutrons. A material will have a positive static charge if it has protons one or more than its electrons as it loses its electrons.

A material will have a negative static charge if it has more electrons than one or more electrons as it gains electrons. Charging by induction is the process of transferring or charging when a charged conductor is placed near the uncharged conductor. The uncharged conductor gains charges of the opposite polarity of a charged conductor.

Charging by conduct is also called charging by conduction. When a charged conductor is made contact with the uncharged conductor, the uncharged conductor becomes charged.

When you walk across the carpet, you cause friction to move across the carpet and to the stole of shoes. This causes the transfer of electrons from the carpet to the body. When we touch a metal surface, like a metal doorknob, the electrons will move from the body to the doorknob, causing a spark.

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Machine 1 has the greatest mechanical advantage among the given machines. To determine the machine with the greatest mechanical advantage, we need to calculate the mechanical advantage for each machine.

Machine 1: Mechanical Advantage = Output Force / Input Force = 50 N / 5 N = 10

Machine 2: Mechanical Advantage = Output Force / Input Force = 50 N / 10 N = 5

Machine 3: Mechanical Advantage = Output Force / Input Force = 50 N / 25 N = 2

Machine 4: Mechanical Advantage = Output Force / Input Force = 50 N / 50 N = 1

Comparing the mechanical advantages, we can see that Machine 1 has the highest mechanical advantage of 10. This means that Machine 1 can multiply the input force by 10 to produce the output force. It provides the greatest amplification of force among the four machines.

Machine 2 has a mechanical advantage of 5, Machine 3 has a mechanical advantage of 2, and Machine 4 has a mechanical advantage of 1. Therefore, Machine 1 has the greatest mechanical advantage among the given machines.

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The magnitude of the magnification indicates the size change of the image relative to the object. In this case, the magnitude is 0.2, indicating that the image is one-fifth the size of the object.

To determine the magnification of a real image formed by a mirror, we can use the magnification formula:

Magnification (m) = - (Image distance) / (Object distance)

Given:

Image distance (di) = 10.0 cm

Object distance (do) = 50.0 cm

Substituting the given values into the formula, we have:

m = [tex]- (10.0 cm) / (50.0 cm)[/tex]

Simplifying the equation, we find:

m = -0.2

The negative sign indicates that the real image formed by the mirror is inverted compared to the object.

Therefore, the magnification of the real image is -0.2.

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Ice and snow in the polar regions play a crucial role in shaping the climate of these areas through various mechanisms.

Firstly, ice and snow have high albedo, meaning they reflect a significant portion of the incoming solar radiation back into space. This reflective property reduces the amount of solar energy absorbed by the Earth's surface, leading to cooler temperatures in the polar regions.

This phenomenon helps maintain the polar climate and contributes to the formation of ice caps and glaciers.

Secondly, the presence of ice and snow influences the movement of ocean currents and atmospheric circulation patterns. Melting ice and snow contribute to the formation of cold, dense water in polar regions, which sinks and initiates deep ocean currents.

These currents, such as the thermohaline circulation, play a vital role in redistributing heat globally and regulating climate patterns.

Furthermore, the vast ice sheets in polar regions act as a thermal insulator, preventing the transfer of heat between the atmosphere and the underlying ocean. This insulation effect helps maintain lower temperatures in the polar regions, influencing the overall climate and weather patterns.

Additionally, the freezing and melting of ice impact the salinity of the surrounding seawater. Changes in salinity affect the density of water, which can further influence ocean circulation and climate patterns.

In summary, the presence of ice and snow in the polar regions contributes to the climate by reflecting solar radiation, influencing ocean currents and atmospheric circulation, and acting as a thermal insulator. These factors play a significant role in shaping the unique climate conditions found in the polar regions.

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The current flowing through the 1Ω resistor in the circuit is 0.66 A.

The emf of the cells, V = 1.1 V

Internal resistance of the cells, r = Ω

Resistance across the circuit, R = 1 Ω

According to Kirchhoff's current law, the total current flowing into and out of a junction in an electrical circuit is equal.

According to Kirchoff's current law,

(1.1 - V'/2) + (1.1 - V'/2) + (1.1 - V'/2) = V'/1

3/2(1.1 - V') = V'

3.3 - 3V' = 2V'

5V' = 3.3

Therefore, the terminal velocity of the battery is,

V' = 3.3/5

V' = 0.66 V

Therefore, according to Ohm's law, the current flowing through the 1Ω resistor is given by,

I = V'/R

I = 0.66/1

I = 0.66 A

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The correct answer isThe astronaut's b) mass remains the same.

The mass of an object remains constant regardless of its position or distance from the center of the Earth. Mass is a measure of the amount of matter in an object and is an intrinsic property. It does not change with the position or location of the object.

On the other hand, the weight of an object can vary depending on its distance from the center of the Earth. Weight is the force experienced by an object due to gravity and is dependent on the mass of the object and the gravitational acceleration at its location.

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As an astronaunt travels from the surface of the earth to a postion that is four times

as far away from the center of the earth, the astronaut's

a) mass decreases

b)

mass remains the same

c) weight increases

d) weight remains the same

An insulating vessel contains 80 g of a block of ice at -12 °C. If 450 g of water at 60 °C is added to the ice in the vessel, Energy required for complete melting = [tex]80 g X (3.33 X 10^3 J/kg)[/tex].

To determine whether the ice will soften absolutely and calculate the final temperature of the system, we need to do not forget the strength transferred among the ice and water at some stage in the procedure.

(i) To decide if the ice will melt completely, we need to examine the energy won by using the ice to the electricity required for complete melting.

Energy received by way of the ice = mass of ice × particular heat capacity of ice × alternate in temperature

Energy won by using the ice = eighty g × 2100 J/(kg·°C) × (final temperature - (-12°C))

Energy required for complete melting = mass of ice × latent warmth of fusion of ice

Energy required for whole melting = 80 g × (3.33 × 10^3 J/kg)

If the strength received via the ice is extra than or same to the electricity required for entire melting, the ice will soften completely.

(ii) To calculate the very last temperature of the gadget, we want to keep in mind the power transferred between the ice and water.

Energy won by the water = mass of water × unique heat ability of water × trade in temperature

Energy received by using the water = 450 g × 4200 J/(kg·°C) × (final temperature - 60°C)

Since electricity is conserved inside the machine, the power gained by means of the ice and water need to be identical:

Energy gained through the ice = Energy won by the water

Using the equations above, we will installation the following equation:

80 g × 2100 J/(kg·°C) × (very last temperature - (-12°C)) = 450 g × 4200 J/(kg·°C) × (very last temperature - 60°C)

Thus, this the final temperature of the system.

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a. The minimum time for the rocket to reach the sound barrier is 33.67 seconds.

b. The maximum vertical thrust of the rocket engines under these conditions is 250,893.6 N.

c. The rocket is 5548.1 meters above the Earth's surface when it breaks the sound barrier.

To solve this problem, we'll use Newton's second law of motion (F = ma) and consider the forces acting on the rocket and the instrument inside.

Calculating the minimum time for the rocket to reach the sound barrier without breaking the inside wire.

a) Minimum time to reach the sound barrier:

Given:

Mass of the rocket (m) = 2.56 × [tex]10^4[/tex] kg

Acceleration due to gravity (g) = 9.8 m/[tex]s^2[/tex]

Maximum tension the wire can support (T_max) = 27.5 N

Weight of the instrument (W) = mass of the instrument × acceleration due to gravity = 13.6 N

The forces acting on the instrument inside the rocket are its weight (W) and the tension in the wire (T). At maximum tension, the net force on the instrument is zero.

T - W = 0

T = W

Therefore, the maximum tension in the wire is equal to the weight of the instrument, which is 13.6 N.

Now, let's determine the acceleration of the rocket. The total force acting on the rocket is the sum of the rocket's weight (mg) and the tension in the wire (T).

F_total = mg + T

F_total = (2.56 × [tex]10^4[/tex] kg)(9.8 m/[tex]s^2[/tex]) + 13.6 N

F_total = 250,880 N + 13.6 N

F_total = 250,893.6 N

Since we're assuming the rocket's acceleration is constant.

we can use Newton's second law:

F_total = ma

250,893.6 N = (2.56 × [tex]10^4[/tex] kg)a

Solving for acceleration:

a = 250,893.6 N / (2.56 × [tex]10^4[/tex] kg)

a ≈ 9.8 m/[tex]s^2[/tex]

The acceleration of the rocket is approximately 9.8 m/[tex]s^2[/tex], which is the same as the acceleration due to gravity.

To find the minimum time to reach the sound barrier, we can use the following equation of motion:

v = u + at

where,

v = final velocity (sound barrier velocity = 330 m/s)

u = initial velocity (which is zero since the rocket starts from rest)

a = acceleration

t = time

330 m/s = 0 + (9.8 m/[tex]s^2[/tex])t

Solving for t:

t = 330 m/s / 9.8 m/[tex]s^2[/tex]

t ≈ 33.67 s

Therefore, the minimum time for the rocket to reach the sound barrier without breaking the inside wire is approximately 33.67 seconds.

b) Maximum vertical thrust of the rocket engines:

The maximum vertical thrust of the rocket engines is equal to the total force acting on the rocket, which we calculated earlier:

Maximum vertical thrust = F_total

Maximum vertical thrust ≈ 250,893.6 N

Therefore, the maximum vertical thrust of the rocket engines under these conditions is approximately 250,893.6 N.

c) Distance above the Earth's surface when breaking the sound barrier:

To determine the distance above the Earth's surface when breaking the sound barrier, we can use the following equation of motion:

s = ut + (1/2)at^2

where,

s = distance

u = initial velocity (which is zero)

a = acceleration

t = time it takes to reach the sound barrier (33.67 s).

s = 0 + (1/2)( 9.8 m/[tex]s^2[/tex])[tex](33.67 s)^2[/tex]

s = ([tex]4.9 m/s^2[/tex])(1132.8289 [tex]s^2[/tex])

s ≈ 5548.1 m

Therefore, the rocket is approximately 5548.1 meters (or 5.55 kilometers) above the Earth's surface when it breaks the sound barrier.

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The crew on the ship hears a frequency of about 1251.5 Hz when the aircraft is going away from them.

The crew hears a higher frequency  than the jet when the sound waves are condensed. The Doppler effect with a moving source can be calculated using the formula f' = (v v s) / (v v o) * f.  where:

The  frequency of the observer is indicated by f'.  

v o is the velocity of the crew relative to the medium (water), v s is the velocity of the source (jet) relative to the medium, and f is the emission frequency  (water).  

In this case, f = 1550 Hz (radiation rate), v s = 67.0 m/s (velocity of jet relative to water), v o = 0 m/s (velocity of crew at rest), and v = 343 m/s ( speed of sound).  By entering these numbers into the algorithm, we can determine the frequency  the crew will hear when the plane is close.

f' = 410 / 343 * 1550 Hz f' = (343 67) / (343 0) * 1550 Hz f' = (343 0) * 1550 Hz f' 1856.8 Hz

Hence the crew on board the ship hears a frequency of about 1856.8 Hz as the jet draws near.

We can get the frequency heard by the crew when the jet is traveling away by using the same parameters as previously but with v s = -67.0 m/s (negative sign indicates the aircraft is flying away).

F' = (276 / 343 * 1550 Hz) f' = (343 - 67) / (343 + 0) * 1550 Hz f' 1251.5 Hz

The crew on the ship, therefore, hears a frequency of about 1251.5 Hz when the aircraft is going away from them.

To know more about the Doppler effect:

https://brainly.com/question/28106478

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Answer:

yes

Explanation:

elocity of 1.95x108 m/s.