When a moving object reflects sound back to a stationary source of frequency f, two Doppler shifts of this frequency occur - when the object receives the sound and when it reemits it. If the object's speed, u, is much smaller than the sound speed, v, the net Doppler frequency shift, Δf, simplifies to Δff≈2u/v. Calculate this shift for a blood flow of 12.9 cm/s interrogated by a 7.40MHz signal.

Answer:

The horizontal speed is approximately 29 m/s.

Explanation:

Given that; range = 80 meters, height = 37 meters.

The horizontal speed can be determined by:

R = U\(\sqrt{\frac{2H}{g} }\)

Where R is the range, U is the velocity of the object, H is the height and g is the acceleration due to gravity (9.8 m/\(s^{2}\)).

So that:

80 = U\(\sqrt{\frac{2*37}{9.8} }\)

     = U\(\sqrt{\frac{74}{9.8} }\)

     = U\(\sqrt{7.55102}\)

80 = 2.747912U

⇒ U = \(\frac{80}{2.747912}\)

       = 29.1130

U ≅ 29 m/s

The horizontal speed is approximately 29 m/s.

Answer:

The gravity helps the planets stay together near the Sun, without it Earth would be floating away with the planet eventually becoming frozen up, thus the role gravity have in the motion of planets around the sun is by keeping them together.

Explanation:

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The angle between them is 90°

A = √(1^2 + 1^2) = √2

B = √(1^2 + 1^2) = √2

The magnitude of both vectors is √2

Dot product

A.B = (i + j) . (i - j)

A.B = 1 - 1 = 0

The dot product of two vectors is equal to ABCosx

A.B = ABCosx

0 = √2 × √2 × Cosx

0 = Cosx

∴ x = 90°

The angle between them is 90°

An angle is a figure in Euclidean geometry created by two rays, called the sides of the angle, that share a common termination, called the vertex of the angle. Angles formed by two rays are located in the plane containing the rays. Angles are also generated when two planes intersect. These are known as dihedral angles. An angle defined by two intersecting curves is the angle of the rays lying tangent to the respective curves at their point of junction.

The angle can also refer to the measurement of an angle or of a rotation. This measurement is the length of a circular arc divided by its radius. In the case of a geometric angle, the arc is defined by the sides and is centered at the vertex.

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Answer:

heyyyyyyy

Explanation:

Answer:

As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level. This is what meteorologists and mountaineers mean by "thin air." Thin air exerts less pressure than air at a lower altitude

The density of water expressed in SI unit is 1000.3 kg/m³

Density is defined as the ratio of mass per unit volume.

where M is the mass of the object and V is the volume occupied by the object

As we know that 1 slug = 14.593 kg

So 1.94 slug = 1.94 × 14.593 kg

Also 1 ft³ = 0.0283 m³

On converting slug/ft³ to kg/m³

= (1.94 slug/ ft³) * (14.593/1 slug) * (1/0.0283 )

= 1000.3 kg/m³

Therefore the density in SI unit is 1000.3 kg/m³.

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Answer.

Conduction

Convection

explanation.

Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat. If there is a temperature difference between two systems heat will always find a way to transfer from the higher to lower system.

Answer:

In Principia, Newton formulated the laws of motion and universal gravitation that formed the dominant scientific viewpoint until it was superseded by the theory of relativity.

A) Yes, the Great Plains were formed from the sediments from the Mississippi River.

The rock of the Great Plains is sedimentary rock and the rock of the Rocky Mountains is igneous rock. They formed in different ways so they must not have formed together.

The Great Plains (Great American Desert) is a plain in North America that stretches from the Rocky Mountains, Canada to Mexico. It is bordered by the Rio Grande to the south, the Mackenzie River delta to the north, Canada to the east and the Rocky Mountains to the west.

This plain is a rocky, sandy area and is very short of water because it has a high evaporation rate. The Great Plains are about 3,000 miles (4,800 kilometers) long, 300–700 miles wide and about 1,125,000 square kilometers (2,900,000 square kilometers), about the equivalent of one third of the area of the United States.

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Answer:

The differences between the Florida's weasel and in Wyoming's is that I can see that in Wyoming it has a lot of snow so Wyoming's weasel fur is more thicker than Florida's weasel.

Explanation:

Overmore, in Florida's weasel the weasel's fur is much more less then Wyoming's weasel's fur. Subsequently, their fur color is very different. In Wyoming's weasel fur, it's white fur help them blend in the snow. In Florida's weasel fur, it's brown and help blend in the grass(soil).

Weasels are small animals with long tail. Their diet will change in each seasons and will causes consecutive changes in body weight also.

The changes occurs in a living body or in a material with respect to different seasons is called seasonal changes.Weasels have coats that change from light brown to white in the winter. They are also known as ermines or short-tailed weasels.

In both the spring and the fall, the hue of their bodies changes, starting at their belly and moving outward. Long-tailed weasels and other species may also turn at least partially white.

The hue shift is caused by daylight duration rather than temperature. Weasels may therefore appear dazzling white in the winter against a brown environment before snow begins to fall. This makes them easy prey for larger predators like foxes, martens, and badgers during milder winters.

These little creatures eat a lot. Winter weasels forage often and consume roughly 40% of their body weight each day. Winter weasels have coats that change from light brown to white in the winter.

These pests, which can weigh as little as two ounces, are vicious and may attack prey that is larger than themselves. Weasels have excellent senses and are highly nimble. Because of this, they are difficult to catch and remove, both for humans and for predators.

Weasels are a sign of a healthy population of rodents or other prey on a property in the winter. The pests frequently reserve a portion of their meals for later.

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Speed of the wave will be = 129 m/s

given

mass = 60 g = 0.06 kg

length = 2 m

wave speed  = v = \(\sqrt{\frac{T}{mu} }\)

T = Tension of the rope = 500 N

mu = linear mass density

mu = mass / length

     = 0.06 / 2 = 0.03 kg/m

v = \(\sqrt{\frac{500}{0.03} }\) = 129 m/s

speed of the wave will be = 129 m/s

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1. Connect the DC motor with a potentiometer to the Arduino board, along with a temperature sensor and an IR sensor with an LED.

2. Write the necessary code to integrate all the sensors and control the motor based on the inputs.

To connect a DC motor with a potentiometer to an Arduino board, you will need to use a motor driver module that can handle the power requirements of the motor. The motor driver module allows you to control the speed and direction of the motor using the Arduino. Connect the motor to the appropriate terminals on the motor driver module and the potentiometer to an analog input pin on the Arduino. The potentiometer will act as a voltage divider, allowing you to vary the input voltage to control the motor speed.

Next, connect a temperature sensor that can measure temperatures in the range of -10 to +45 degrees Celsius. Depending on the type of temperature sensor you are using, you may need to follow specific wiring instructions provided by the manufacturer. Connect the temperature sensor to the appropriate digital or analog input pin on the Arduino board.

Lastly, connect an IR sensor with an LED to detect motor overspeed. The IR sensor can be used to measure the rotational speed of the motor by detecting interruptions in the infrared beam caused by the rotating motor shaft. If the motor speed exceeds the threshold of 25,000 rpm, the IR sensor will trigger an output to activate the LED as a signal.

To make all the sensors work together, you will need to write code using the Arduino programming language. Use appropriate libraries and functions to read the sensor values and implement the desired logic for motor control and overspeed detection. You can define temperature thresholds and motor speed limits in the code and take appropriate actions based on the sensor readings.

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Answer:

The name given to the underwater mountains in the middle of oceans is;

Mid-ocean ridges

Explanation:

Mid-ocean ridges, also known as mid-oceanic ridge is a mountain range made by plate tectonics under the water.

The magma created at a divergent boundary where two tectonic plates meet due to the rise of convection currents in the Earth's mantle which is beneath the oceanic crust results in the uplifting of the ocean floor.

a. The Aya's weight on Earth is 441 Newtons.

b. The Aya's mass on the moon would still be 45 kg.

c. Aya's weight on the moon is 72 Newtons.

a. Ayas weight on Earth can be calculated using the formula:

Weight = mass * gravitational acceleration

The gravitational acceleration on Earth is 9.8 m/\(s^2\).

Plugging in the given mass:

Weight = 45 kg * 9.8 m/\(s^2\) = 441 N

Therefore, Ayas' weight on Earth is 441 Newtons.

b. Aya's mass remains the same on the moon as it does on Earth. Therefore, Aya's mass on the moon would still be 45 kg.

c. To calculate Aya's weight on the moon, we need to consider the gravitational acceleration on the moon. The gravitational acceleration on the moon is approximately 1.6 m/\(s^{2}\). Using the same formula:

Weight = mass * gravitational acceleration

Weight = 45 kg * 1.6 m/\(s^{2}\) = 72 N

Therefore, Aya's weight on the moon is 72 Newtons.

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Answer:

Parte A

2000 J

Parte B

400 N

Parte C

900 N

Explanation:

Los parámetros dados son;

La fuerza horizontal con la que la persona arrastra los muebles = 400 N

El peso de los muebles = 900 N

La distancia que se mueve el mueble en el piso = 5 m

El tipo de movimiento del mueble = M.R.U. Movimiento de línea uniforme

Por lo tanto;

Parte A

Trabajo realizado = Fuerza × Dirección de movimiento de la fuerza

Por lo tanto;

Trabajo realizado en, W = 400 N × 5 m = 2000 J

Parte B

La fuerza horizontal aplicada para arrastrar el mueble = 400 N = La fuerza de fricción que actúa sobre el mueble

La fuerza de fricción que actúa sobre el mueble = 400 N

Parte C

El peso de los muebles se toma como dado 900 N.

Answer:

46

Explanation:

2900 divided by 63 (2900/63)

-  46.03174603

Rounded to the nearest whole number

is 46.

THE ANSWER IS 46

Answer:

46 hours

Explanation:

When a honeybee flies through the air, it acquires a charge of +20 pC. Part A: It loses 4 electrons in the process.

It is generally knowledge that sound waves may bend around corners or pass through doorways, enabling us to hear conversations taking place in nearby rooms.

The air on the opposing side of the barrier also vibrates as a result of the audio hitting the wall. You will be able to hear some sound through a sturdy, solid wall since it won't spread the vibrations too much.

A reflecting wave is created as a sound crosses a room and collides with a wall, reintroducing some of that waveform back into the space. The originating sound will endeavor to go through the wall and into the next space. Sound Transmission is the name for the energy that remains after this transmission.

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the magnitude of the magnetic field midway between the two wires is 5.0 × 10−5 T. Hence, option (B) is the correct answer.

Given data:

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions.

The wires are separated by 0.20 m.The magnetic field midway between the two wires is to be determined.Formula used:

B = (μ₀ * I * i)/(2πd)

Where,B is the magnetic field at the midpoint between two wires,μ₀ is the permeability of free space, which is equal to 4π × 10−7 T∙

m/ I is the current in the first wire, and i is the current in the second wire.d is the separation between the two wires.

Substitute the given values into the above formula,

B = (μ₀ * I * i)/(2πd) = (4π × 10−7 T∙m/A * 20 A * 5 A)/(2π * 0.20 m) = 5.0 × 10−5 T

Therefore, the magnitude of the magnetic field midway between the two wires is 5.0 × 10−5 T. Hence, option (B) is the correct answer.

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Answer:

4 ohms

Explanation:

Current = Voltage/resistance

2 = 8/R

2R = 8

R = 4

Answer:

Active transport

The vehicle has an acceleration of 5 m/s² -  A motorbike, when its speed changes from rest to 50 m/s in 10s

What is an acceleration ?

Acceleration is the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions.

Acceleration is a vector quantity since it has both a magnitude and a direction. A vector quantity is also velocity. The velocity vector change during a time interval divided by the time interval is the definition of acceleration.

All the vehicles have an initial velocity ( u) = 0
A- For bicycle
Final velocity (v) = 2.5m/s    time (t) = 2s
acceleration = 2.5/2 = 1.25m/s2

B- For car
Final velocity (v) = 15m/s    time (t) = 5s
acceleration = 15/5 = 3m/s2

C- For lorry
Final velocity (v) = 20m/s    time (t) = 15s
acceleration = 20/15= 1.33m/s2

D- For motorbike
Final velocity (v) = 50m/s    time (t) = 10s
acceleration = 50/10= 5m/s2

Option D is the correct answer as the motorbike will have an acceleration of 5m/s2.
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Answer:

The wheel spins for 11.43s. The number cannot be determined.

Explanation:

We know that initial velocity is 124.4 rpm = 13.027137522 rad/s, acceleration is -1.14 rad/s^2, and final velocity is assumed to be 0 rad/s. We are asked to find t and displacement. We use the equation \(\omega=\omega_0+\alpha t\) where \(\omega=0 rad/s\), \(\omega_0=13.027 rad/s\), \(\alpha=-1.14rad/s^2\), and \(t=?\).

Rearrange the equation to obtain \(\frac{\omega-\omega_0}{\alpha}=t\). Plug in the numbers and solve to obtain \(t=11.43s\).

The number of the wheel cannot be determined as we do not know the placement of numbers on the wheel.

Answer:

1)substance A will require 910 J of heat to increase the temperature by 10°C.

2) Substance B

3) Substance A

Explanation:

1) The meaning of the statement: "specific heat capacity of A is 910 J/kg °C" is that 1 kg of substance A will require 910 J of heat to increase the temperature by 10°C.

2) While heating equal mass of all the three substances supplied with equal amount of heat, Substance B will gain more temperature due to the fact that substances of lesser specific heat capacity always tend to gain or loose heat within a short period of time.

3) While keeping equal mass at the three substances heated for the same temperature of 100°C and kept on a wax slab, substance A will go down more in depth due to the fact that heat is preserved for a longer period of time for substances that have higher specific heat capacity.

Yes, PNS system causes more frequent depolarizations to the SA (Sinoatrial) node.

The PNS (Parasympathetic Nervous System) is responsible for decreasing the heart rate. It does so by releasing acetylcholine, which stimulates the M2 muscarinic receptors found in the SA node. When acetylcholine binds to M2 receptors, it opens potassium channels, leading to hyperpolarization of the SA node cells.As a result, the pacemaker potential threshold increases and requires more time to reach the threshold for depolarization, thus reducing the heart rate. Therefore, by decreasing the potassium ion permeability of the ECF, it slows the heart rate, resulting in fewer depolarizations in the SA node, causing a lower heart rate.

In summary, the parasympathetic nervous system (PNS) causes more frequent depolarizations to the SA node. The PNS slows down the heart rate, but this does not mean that the pacemaker potential is reduced. Instead, the pacemaker potential is hyperpolarized, increasing the threshold for depolarization. Thus, fewer action potentials reach the threshold, and heart rate is decreased. So, the decrease in potassium permeability in the ECF and an increase in the parasympathetic nervous system causes hyperpolarization of the SA node and increases the threshold for depolarization. This, in turn, leads to fewer depolarizations in the SA node, causing a slower heart rate.

Therefore, it can be concluded that the PNS system causes more frequent depolarizations to the SA node and decreases heart rate by increasing the threshold for depolarization, which is accomplished by hyperpolarizing the pacemaker potential.

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The first process is isothermal expansion, where temperature remains constant at 300 K. The second process is isobaric compression, where pressure remains constant at 2.50 x 10^5 Pa.

In the first process, the helium gas undergoes isothermal expansion. This means that the temperature remains constant at 300 K while the pressure increases from 1.00 x 10^5 Pa to 2.50 x 10^5 Pa. The piston moves freely, allowing the gas to expand and maintain a constant temperature. During this expansion, the gas does work on the piston.

In the second process, the gas is compressed at constant pressure (isobaric compression) until it returns to its original volume of 1.50 L. During this compression, work is done on the gas, causing it to return to its initial state. Since the gas is treated as ideal, we can use the Ideal Gas Law (PV=nRT) to analyze both processes.

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The Time difference in the period of a simple pendulum is 11.6 s

The period of a simple pendulum is given as follows,

\($$T=2\pi \sqrt{\frac{L}{g}}$$\)

Where

T = time period

L = length of the pendulum

g = acceleration due to gravity = 9.8 m/s²

The period of the original pendulum is given as:

T = 2π√(L/g)

The time period of the shortened pendulum is given as:

T' = 2π√(L'-g)

By comparing the above two equations, we have,

T' = 2π√[(L-2.90 mm)/g] ≈ T

[As 2.90mm is very small compared to 62cm]

Therefore, the time difference,

ΔT = T' - T= 0Hr. 00min. 11.6s (approx)≈ 11.6s (approx)

Thus, the clock will be slower by approximately 11.6s every 24 hours.

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