The human body has an average density of 979 kg/m3 , what fraction of a person is submerged when floating gently in fresh water?

Answer:

1.944m_s²

Explanation:

First convert speed from km/h to m/s the use the formula a=v-u

t

Answer:

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Explanation:

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Patrick's average velocity for the trip is 0.41 m/s along southeast.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Resultant displacement of Patrick = √(70² +20²) meter southeast

= 72.801 meter southeast.

Total time interval = 150 second + 30 second = 180 second

Hence, his average velocity for the trip is = resultant displacement/ Total time interval

= 72.801 meter ÷ 180 second

= 0.41 m/s along southeast

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The distance taken by an average driver, driving at 20 miles per hour, to apply the brakes the moment danger is detected is 44 feet.

This is based on the average reaction time of 1.5 seconds, as stated in the Smith System Driver Improvement Institute.

The stopping distance is the sum of the driver's reaction distance and braking distance.

The reaction distance is the distance that a driver covers during the reaction time.

The braking distance is the distance covered by the car from the time the brakes are applied to the time the car comes to a stop.

The distance depends on factors such as speed, road condition, and the car's condition.

In the case of an average driver moving at 20 miles per hour, the reaction distance is approximately 22 feet, given the average reaction time of 1.5 seconds.

The braking distance would also be approximately 22 feet.

the total distance taken by the car to stop is 44 feet.

The distance taken by an average driver to apply the brakes varies with different speeds.

As the speed increases, the distance taken to stop also increases.

For instance, at 30 miles per hour, the distance taken to apply the brakes would be approximately 66 feet.

At 40 miles per hour, the distance taken to apply the brakes would be approximately 110 feet.

In conclusion, the speed at which a vehicle is traveling at the moment danger is detected significantly influences the stopping distance.

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The image would be a virtual, upright image and the power of the lens is approximately 4.4 diopters.

a) When a book is placed 8.0 cm behind a lens and it is desired to magnify the reading material by a factor of 3.5 times, the resulting image would be a virtual and upright image.

b) To find the power of the lens, we can use the lens equation:

1/f = 1/di + 1/do

where f is the focal length of the lens, di is the image distance, and do is the object distance.

Since the image is virtual and upright, di is negative. We can use the magnification equation to relate the object distance to the image distance:

M = -di/do

where M is the magnification.

Since the magnification is given as 3.5, we have:

di/do = 3.5

Solving for di in terms of do, we get:

di = -3.5 do

Now we can substitute this expression for di into the lens equation:

1/f = 1/di + 1/do

1/f = -1/3.5do + 1/do

1/f = (1/3.5 - 1) / do

1/f = -0.57 / do

Solving for f, we get:

f = -1.75/do

Now we can use the given object distance of 8.0 cm to find the power of the lens:

f = -1.75/0.08 = -21.875

The power of the lens is therefore +21.875 diopters, or approximately +22 diopters (since diopters are the unit of measurement for lens power).

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The speed of the car having kinetic energy 458,350 J  is 28.03m/s

What is What is Kinetic Energy ?

Kinetic energy is a type of power that a moving object or particle possesses. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force. A moving object or particle has kinetic energy, which depends on both its mass and its rate of motion. The type of motion can be vibration, rotation on an axis, translation (or travel along a path from one place to another), or any combination of these.

K.E = 1/2*m*v2

K.E = kinetic energy

m = mass

v = velocity/speed

458350 = 1/2*1167*v2

v2= 458350*2/1167

v = 28.03 m/s

The speed of the car having kinetic energy 458,350 J  is 28.03m/s

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Answer:

Wavelength of radio wave = 4.96 meter (Approx.)

Explanation:

Given:

Frequency of radio wave = 60,500,000 Hz

Velocity of radio waves = 300,000,000 m/s

Find:

Wavelength of radio wave

Computation:

Wavelength = Velocity / frequency

Wavelength of radio wave = Velocity of radio waves / Frequency of radio wave

Wavelength of radio wave = 300,000,000 / 60,500,000

Wavelength of radio wave = 4.9586

Wavelength of radio wave = 4.96 meter (Approx.)

To get the distance of an echo that equals 17m, you need to know the speed of sound and the time it takes for the echo to bounce back.

The speed of sound in air is approximately 343 meters per second. So, to calculate the time it takes for the sound to travel to the object and back, you need to divide the distance by the speed of sound.

Here's the formula:
Time = Distance / Speed of Sound

So, if you want to find the time it takes for sound to travel to the object and back and reach your ears as an echo, you can use this formula.
Time = 17m / 343 m/s
Time = 0.0496 seconds

This means that it takes approximately 0.0496 seconds for the sound to travel to the object and back, and for the echo to reach your ears. Keep in mind that this calculation assumes that the sound waves travel directly to and from the object, without any obstructions or other factors that could affect the speed or distance of the sound.

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The given problem can be exemplified in the following diagram:

The weight of the bar is concentrated in its center of mass which is located in the middle of the longitude of the bar. We can add the total torques at the point where the pivot touches the bar and we get:

Here we have used momentum counter-clockwise as positive. Since the system is in equilibrium the sum of the torques must be equal to zero:

Now we solve the operations, we will use for the acceleration of gravity 9.8 meters per second squared:

Now we solve for the mass "M" first by subtracting 88.2Nm from both sides:

Now we divide both sides by -1.96:

Solving the operations we get:

Therefore, the mass of the bar is 45 kg.

The following is not a true statement regarding the requirement for grounding of equipment: When equipment operates with any terminal at over 50 volts to ground. option d

What is grounding?

Grounding or earthing is the process of connecting an electrical device to the earth. The electrical circuit is established by the connection between the conductive materials of an electrical device and the earth or a conductor that acts as the earth. It is essential to ground electrical equipment to maintain a safe environment. There are several requirements for grounding of equipment that needs to be followed.

Specific requirements for grounding luminaires are located in 250.119 of the NEC. Grounding of the metal parts of fixed luminaires is required to protect the equipment from becoming electrically charged in the event of a fault in the wiring or other components. Metal luminaires are used in the outdoor areas, commercial or residential buildings, and industrial locations.When a submersible pump is used in a metal well casing, the well casing is required to be bonded to the pump circuit equipment grounding conductor. A submersible pump is a device that has a motor that is sealed within a well that is filled with water. These pumps can be used to supply water from the well to the surface. They can also be used in a variety of industrial settings, including manufacturing and processing facilities, to move fluids from one place to another.

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The light ray will travel at an angle of approximately 26.8 degrees off of normal inside the plastic. When a light ray travels from air into a flat piece of plastic with an index of refraction of 1.30 at an angle of 44.5 degrees off the plane of the surface, it will refract and change direction.

The angle that the light ray will travel inside the plastic can be found using Snell's Law, which states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the indices of refraction of the two media:

sin(θ1) / sin(θ2) = n2 / n1

where θ1 is the angle of incidence (measured from the normal), θ2 is the angle of refraction (also measured from the normal), n1 is the index of refraction of the first medium (in this case, air), and n2 is the index of refraction of the second medium (in this case, the plastic).

We are given θ1 = 44.5 degrees and n1 = 1 (since air has an index of refraction very close to 1). We are also given n2 = 1.30. Solving for θ2, we get:

sin(θ2) = n1 / n2 * sin(θ1) = 1 / 1.30 * sin(44.5 degrees) ≈ 0.442

Taking the inverse sine of both sides, we get:

θ2 ≈ 26.8 degrees

Therefore, the light ray will travel at an angle of approximately 26.8 degrees off of normal inside the plastic.

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The term pear-shaped refers to fat storage in the waist, hips, and thighs.

The concept of body fat distribution refers to how fat is stored in different areas of the body. The two primary patterns of fat distribution are commonly referred to as "apple-shaped" and "pear-shaped." The term "pear-shaped" specifically describes the fat storage pattern where individuals tend to accumulate excess fat in the waist, hips, and thighs.

In the pear-shaped pattern, fat is deposited predominantly in the lower body, giving the body a narrower upper torso (waist) compared to the wider lower body (hips and thighs), resembling the shape of a pear. This distribution is more common in individuals with a lower body mass index (BMI) and is often associated with the female body shape.

Several factors contribute to the pear-shaped fat distribution, including genetics, hormones, and age. Hormones such as estrogen play a role in directing fat storage in specific areas, and genetic predispositions can influence where fat is deposited. Additionally, as individuals age, hormonal changes and shifts in body composition can impact fat distribution patterns.

Understanding body fat distribution patterns can have implications for overall health. While excess fat storage in the lower body (pear-shaped) is generally considered less risky than excess fat storage in the abdominal region (apple-shaped), both patterns can still contribute to health risks and complications.

It is important to maintain a balanced and healthy lifestyle, including regular physical activity and a nutritious diet, to manage body fat distribution and promote overall well-being.

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Scalar quantities have magnitude only, while vector quantities have magnitude and direction. Scalars can be added algebraically, while vectors follow specific rules. Scalars have a single value, while vectors require representation with magnitude and direction.

Scalar quantities and vector quantities are two fundamental types of physical quantities used in physics. Here are five key differences between scalar and vector quantities:

1. Definition: Scalar quantities are defined by magnitude only, meaning they have a numerical value but no specific direction. Examples of scalars include time, temperature, mass, and speed. In contrast, vector quantities have both magnitude and direction. Examples of vectors include displacement, velocity, force, and acceleration.

2. Representation: Scalar quantities are represented by a single numerical value or variable, often accompanied by appropriate units. For instance, temperature can be represented by a value like 25 degrees Celsius. Vector quantities, on the other hand, require a representation that includes both magnitude and direction. This can be achieved using vectors or by using a combination of numerical values and angles.

3. Addition and Subtraction: Scalar quantities can be added or subtracted algebraically by simply considering their numerical values. For example, adding two temperatures of 10 degrees Celsius and 15 degrees Celsius gives a result of 25 degrees Celsius. In contrast, vector quantities follow different rules for addition and subtraction. Vector addition involves considering both the magnitude and direction of the vectors, using methods such as the parallelogram law or the triangle law.

4. Algebraic Operations: Scalar quantities can undergo all basic algebraic operations, such as multiplication, division, addition, and subtraction. These operations apply only to the numerical values of the scalars. Vector quantities, however, have additional operations specific to vectors, including dot product and cross product, which involve both the magnitude and direction of the vectors.

5. Physical Interpretation: Scalar quantities represent quantities that can be fully described by a single value, such as the magnitude of a quantity. For example, the speed of an object is a scalar that represents the magnitude of its velocity. Vector quantities, on the other hand, have physical interpretations that involve both magnitude and direction. For instance, displacement represents both the distance and the direction from the starting point to the endpoint.

In summary, scalar quantities have magnitude only, while vector quantities have both magnitude and direction. Scalars are represented by single numerical values, while vectors require representation with both magnitude and direction. Scalar quantities can be algebraically added or subtracted, whereas vector quantities follow specific rules for vector addition and subtraction. Scalars can undergo all basic algebraic operations, while vectors have additional vector-specific operations. Scalar quantities represent fully describable quantities, while vector quantities require consideration of both magnitude and direction for a complete description.

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Collected data plays a crucial role in evaluating whether the criteria for success have been met. By analyzing the collected data, one can assess the progress made towards achieving the desired goals and determine if the criteria have been fulfilled.

Data provides an objective measure of performance or outcomes, allowing for an evidence-based assessment of success. It helps to quantify and track key metrics or indicators related to the criteria for success. By comparing the actual data with the predetermined benchmarks or targets, one can determine if the criteria have been met or if further improvements are required.

Data analysis also enables the identification of trends, patterns, and correlations, providing insights into the factors influencing success. It helps in identifying areas of strength and areas that need improvement. Additionally, data can be used for comparative analysis, benchmarking against previous periods or similar projects, to gain a broader perspective on success.

In summary, collected data provides an objective basis for evaluating progress and success by comparing actual performance against predetermined criteria, identifying areas of improvement, and gaining insights for future decision-making.

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Answer:

Well AM/Fm is digitally using soundwaves for cars through signal, which we cant hear without one (radio). Concerts are in real life and use wavelegnths that we hear because it bounces off overytihing.

Explanation:

The force that needs to be applied to the small piston of the hydraulic press to lift a body weighing 70,000 N is approximately 495,833.33 N.

To calculate the force required to lift a body using a hydraulic press, we can use Pascal's principle, which states that the pressure applied to an enclosed fluid is transmitted equally in all directions.

In this case, we have a hydraulic press with a small piston of 12 cm² area and a large piston of 85 cm² area. The weight of the body to be lifted is 70,000 N.

Step 1:

Calculate the pressure on the small piston:
Pressure = Force / Area
Pressure = 70,000 N / 12 cm²

Step 2:

Calculate the force required on the large piston:
Force = Pressure x Area
Force = Pressure x 85 cm²

Let's solve these calculations.

Step 1:
Pressure = 70,000 N / 12 cm²
Pressure = 5,833.33 N/cm²

Step 2:
Force = 5,833.33 N/cm² x 85 cm²
Force = 495,833.33 N

Therefore, the force that needs to be applied to the small piston of the hydraulic press to lift a body weighing 70,000 N is approximately 495,833.33 N.

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Answer:

The velocity at impact is 222.2 m/s

Explanation:

The given information are;

The time at which the woman heard the sound of the coin after dropping it into the wishing well = 30 seconds

The average speed of sound in air = 344 m/s

The time in which the dime travel = t₁

The time in which the sound travel = t₂

1/2 × 9.8 × t₁² = 344 × t₂

t₁ + t₂ = 30

4.9·t₁² = 344 × (30 - t₁)

4.9·t₁² + 344·t₁ - 10320 = 0

Which gives -344±

\(t_1 = \dfrac{-344\pm \sqrt{344^{2}-4\times 4.9 \times 10320}}{2\times 4.9}\)

t₁  = 22.676 seconds or -92.9 seconds

Therefore the correct natural time is t₁  = 22.676 seconds

The velocity at impact, v = g×t₁ = 9.8 × 22.676  = 222.2 m/s

The velocity at impact= 222.2 m/s.

Answer:

Explanation:

The strength of the force of friction depends on two factors: how hard the surfaces push together and the types of surfaces involved. What factors affect the gravitational force between two objects? Two factors affect the gravitational attraction between objects: mass and distance.

To answer your question, we need to use the Stefan-Boltzmann law, which states that the power radiated per unit area by a blackbody is proportional to the fourth power of its absolute temperature (in Kelvin).

So, if the construction site is covered with black tarps and has an emissivity of e, it will absorb all the solar power it receives from the sun, and the power it radiates back into the atmosphere will be given by:

P = σ * e * A * T⁴

where σ is the Stefan-Boltzmann constant (5.67 x 10^-8 W/m²K⁴), A is the surface area of the construction site, and T is its equilibrium temperature.

We know that the construction site receives 975 W/m^2 of solar power, so:

975 = σ * e * T⁴

Solving for T, we get:

T = (975 / (σ * e))⁰°⁵

Using the value of σ and assuming an emissivity of 0.9 (typical for black surfaces), we get:

T = (975 / (5.67 x 10^⁻⁸ * 0.9))^1/4 = 353 K (rounded to the nearest Kelvin)

Therefore, the equilibrium temperature of the construction site at midday would be approximately 353 Kelvin (80 degrees Celsius or 176 degrees Fahrenheit).

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The Milky Way galaxy is the home of the Sun. Over 100,000,000,000 stars are thought to be present in the Milky Way alone, according to astronomers.

One of the many billions of galaxies in the cosmos is the Milky Way galaxy. The universe is a large region of space that houses everything that has ever existed. All the galaxies, stars, and planets are in the cosmos. Unknown is the precise size of the universe. According to scientists, the universe is still growing. At least 100 billion stars, including our Sun, make up the Milky Way, a spiral galaxy with a diameter of around 100,000 light-years. We are located in one of the four primary arms of the pinwheel-shaped constellation of stars, roughly two thirds of the way from the center. It is believed that the majority of the stars in our galaxy are home to their own families of planets.

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The spectral lines would appear shifted towards the red end of the spectrum.

Spectral lines :

When the light of a star is separated into its various colors, it is known as a spectrum.

Each element produces a characteristic set of lines at specific wavelengths, known as its spectral lines, when it is heated to a high temperature.

If a substance's spectrum is split into a band of light, the band will contain dark lines at particular wavelengths, referred to as spectral lines.

Spectral lines can be used to determine the composition, temperature, and motion of stars.

When the same two elements were detected in a distant star that was moving away from Earth, the spectral lines would appear to be shifted toward the red end of the spectrum.

This phenomenon is known as redshift.

Redshift is a phenomenon in which the wavelength of light emitted by an object moving away from an observer is stretched, resulting in a shift towards the red end of the spectrum.

It happens because the object's motion is causing the wavelength of the light waves to become longer as they travel through space.

It is due to the Doppler effect, which results in a shift in the wavelength of the light that is emitted or absorbed by a celestial object.

The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer's motion.

When an object is moving closer to an observer, it appears to have a higher pitch or shorter wavelength.

When the object is moving away from the observer, it appears to have a lower pitch or longer wavelength.

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The distanve travelled is d=1200 miles

Time taken is t=420 miles.

The velocity is

The velocity is 2.85 miles/min

Answer:

try this

Explanation:

The energy of a falling object when it hits the ground is equaled to the energy it starts with because the potential energy is converted into kinetic energy entirely with the height at 0. This means the energy would be 200 J.

RESULT

Answer:

Metals produce electrons ( photoelectrons ) when exposed to light.

Explanation:

These photoelectrons produce photocurrent and this was proved by Eistein illustration of photocurrent and stopping potential.

(1.) The Phenomena of Refraction Occurs when a Ray (Here Light) enters a Relatively Denser or Rarer Medium and Due to the Change in Density, the Speed of the Incident Ray Decreases or Increases Respectively.

(2.) If a light ray projected through a diamond, the light would refract drastically.

Cluster B has younger lifetime.

Reaction of cluster-

\(\\\\n+m---------- > \beta \\\\\pi ------------ > \alpha^- +x^+\)

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Answer:

i think its resonance but if im wrong its my fault

Explanation:

Answer:

La materia es la sustancia de la que está hecho todo material. En física, el sistema es una de las propiedades de la materia. Se puede transferir entre objetos y convertir en forma. No se puede crear ni destruir.

espero que te ayude!

(1) Our entire solar system orbits around the center of the Milky Way Galaxy about once every 230 million years.

(2) The milky way and andromeda galaxies are among a few dozen galaxies that make up our Local Group.

(3) The sun appears to rise and set in our sky because earth rotates once each day.

(4) You are one year older each time earth orbits about the sun.

(5) On average, galaxies are getting farther apart with time, which is why we say our universe is expanding.

(6) Our solar system is moving toward the star vega at about 70,000 km/hr.

Our entire solar system orbits around the center of the Milky Way Galaxy about once every 230 million years.

The milky way and andromeda galaxies are among a few dozen galaxies that make up our Local Group.

The sun appears to rise and set in our sky because earth rotates once each day.

You are one year older each time earth orbits about the sun.

On average, galaxies are getting farther apart with time, which is why we say our universe is expanding.

Our solar system is moving toward the star vega at about 70,000 km/hr.

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