An adult inhales about 6.0×10^−4 m^3 of fresh air during a breath. only 20% of fresh air is oxygen. assume the pressure in the lungs is 1.0×10^5 pa and the air is at a temperature of 300 k. How many oxygen molecules are in each breath?

The measure of central tendency that should be used to calculate the cutoff time for the final race is the median.

Option C.

The median is the middle point in a dataset—half of the data points are smaller than the median and half of the data points are larger.

To find the median: Arrange the data points from smallest to largest. If the number of data points is odd, the median is the middle data point in the list.

So from the given data of the 100 meter dash, the measure of central tendency that should be used to calculate the cutoff time for the final race is the median.

The median will help to separate half of the data points that are smaller than the cutoff time and half of the data points are larger than the cutoff time.

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Answer:

Explanation:

A capacitor is an electronic component that stores and releases electrical energy. It consists of two conductive plates separated by an insulating material called a dielectric. When a voltage is applied across the plates, charge accumulates on them, creating an electric field between the plates.

The capacitance of a capacitor is a measure of its ability to store charge. It is typically represented by the symbol 'C' and is measured in farads (F). In your case, you mentioned a 55-μF (microfarad) capacitor, indicating its capacitance value.

When a voltage waveform is applied across a capacitor, the capacitor charges and discharges in response to the changes in voltage. The rate at which the capacitor charges and discharges depends on the capacitance and the resistance in the circuit

Since there is no figure provided in the text, I am unable to reference it for the specific details of the voltage waveform. However, I can explain the general behavior of a capacitor when a voltage waveform is applied.

When a voltage waveform is applied across a capacitor, the capacitor charges and discharges in response to the changes in voltage. The behavior of the capacitor is determined by its capacitance, which is given as 55 μF in this case.

As the voltage waveform varies, the capacitor stores and releases electrical charge. During the rising portion of the waveform, the capacitor charges and accumulates energy. During the falling portion, the capacitor discharges and releases the stored energy.

The exact behavior and characteristics of the voltage waveform and the charging/discharging process depend on the specific shape and frequency of the waveform. Without the specific details of the voltage waveform provided in the figure, it is challenging to provide a more detailed analysis.

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Answer:

Year wise Percentage of Attendance in Senior Secondary Schools of India The given graph shows that the percentage of attendance is recorded with a gap of 5 years. The given table depicts, across time, from the year 2000 to 2015. During the 15 years, there is a steady and healthy increase in the percentage of attendance in ll the four types of schools. The increase in Convent-run schools is much higher compared to the other three types of schools. Initially, the village schools show a noticeably poor percentage of attendance and the General English Medium schools show less percentage of attendance compared to the Convent-run schools. All in all the continuous higher percentage indicates that the relevant authorities are learned about improving the education of the country. The poor attendance in the 2010 in the Government-run village schools shows a big leap in the year 2015, indicating that the Government must have taken an effective measure to improve literacy in the villages. Noteworthy increase in the attendance indicates solid infrastructure and focus towards the healthy growth of the corresponding authorities.

Explanation:

hope it helps you<3

Advantages of Series Circuits is Simple Design: Series circuits are simple and easy to design as they require only a single path for current flow.

Disadvantages of Series Circuits is Single Point of Failure: If any component in a series circuit fails, the entire circuit fails.

Advantages of Parallel Circuits is that there is Independent Operation: Components in a parallel circuit operate independently, meaning that the failure of one component does not affect the operation of others.

Disadvantages of Parallel Circuits is that Complex Design: Parallel circuits are more complex and require more wiring than series circuits.

A series circuit is a circuit in which the components are connected in a single path or loop, so that the same current flows through each component in sequence. The components are connected end-to-end, with the output of one component connected to the input of the next component. In a series circuit, the voltage is shared between the components, and the total resistance is equal to the sum of the individual resistances of each component.

A parallel circuit, on the other hand, is a circuit in which the components are connected in multiple paths, so that the current divides and flows through each component independently. The components are connected side-by-side, with each component having its own path for current flow. In a parallel circuit, the voltage across each component is the same, and the total resistance is less than the individual resistance of each component.

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A closed-loop system has sustained oscillations (i.e., constant amplitude) with a period of 66 seconds when the gains are proportional and integral.

A closed-loop system is a type of control system in which the output is fed back into the system to regulate the input. In this way, the output controls the input. A closed-loop system is a type of feedback control system that includes a controller, a plant, and a sensor. The closed-loop system's sustained oscillations occur due to the interaction between the plant, sensor, and controller. The oscillations are a result of the feedback loop's positive feedback, which amplifies the input and causes it to oscillate.

In a closed-loop system, the gains of the controller play a critical role in determining the oscillations' characteristics. The period of oscillation in a closed-loop system is the time taken for one complete cycle of oscillation. The period of oscillation is measured in seconds. The question states that the closed-loop system has a period of 66 seconds, which implies that it takes 66 seconds to complete one cycle of oscillation. Proportional and integral gains are the two types of gains utilized in a closed-loop system's controller. Proportional gain is the direct relationship between the output and the input. Integral gain, on the other hand, is the error signal's integral over time.

By adding these two gains, the controller may regulate the plant to create the desired output. The fact that the closed-loop system has sustained oscillations with a period of 66 seconds when the gains are proportional and integral implies that the system's feedback loop is stable. In other words, the feedback loop is generating constant oscillations with a fixed period, which is a sign of a stable system.

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Answer:

The coefficient  of kinetic friction is 0.51.

Explanation:

Given that,

Applied force, F = 75 N

Mass of a box, m = 15 kg

The acceleration of the box is 3 m/s²

We need to find the coefficient  of kinetic friction. It is given by the formula as follows :

\(F=\mu_k F_N\)

Where,

\(F_N=mg\), is the normal force

\(\mu_k=\dfrac{F}{mg}\\\\\mu_k=\dfrac{75}{15\times 9.8}\\\\\mu_k=0.51\)

So, the coefficient  of kinetic friction is 0.51.

The two vectors with the largest magnitude when subtracted are A and F. Subtracting A from F will result in the largest difference in magnitude between two vectors.

In physics, a vector is a graphical or mathematical representation of a physical quantity that has both magnitude and direction. For instance, the vector position of a particle in space specifies its location relative to the origin.

The direction of a vector is indicated by an arrow pointing in the direction of the vector's motion. When two vectors are subtracted, the resulting vector is the vector that extends from the end of the vector being subtracted to the end of the vector it is being subtracted from.

If the two vectors have opposing directions, the resultant vector will be the difference between the magnitudes of the two vectors. Here are the vectors given: A -0.12i +0.22jB 0.28i +0.18jC -0.15i -0.14jD -0.05i +0.12jE 0.19i -0.1jF -0.08i -0.25j. To compute the vector magnitude of a vector, we use the formula: |V| = (V₁² + V₂²)¹/²Using this formula, we can compute the magnitudes of the vectors.  

Now, let's calculate the magnitudes of the given vectors: A = (0.12² + 0.22²)¹/² = 0.2488B = (0.28² + 0.18²)¹/² = 0.3246C = (0.15² + 0.14²)¹/² = 0.2108D = (0.05² + 0.12²)¹/² = 0.1312E = (0.19² + 0.1²)¹/² = 0.214F = (0.08² + 0.25²)¹/² = 0.266. Thus, the two vectors with the largest magnitudes will be: A and F.

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The probability that a loaf of bread chosen at random will have a mass of more than 450g is 0.0026 or 0.26%.

The probability that a loaf of bread chosen at random will have a mass of more than 450g is found by first standardizing the random variable, using the standard normal distribution. We can then use the standard normal table or calculator to find the area to the right of the standardized value. The standardized random variable can be found using the formula

Z = (X - μ) / σ,

where X is the given value, μ is the mean, and σ is the standard deviation.

Substituting the given values, we get:

Z = (450 - 400) / 18 = 2.78

Using the standard normal table or calculator, we can find the area to the right of 2.78. This area represents the probability that a loaf of bread chosen at random will have a mass of more than 450g.

Using a standard normal table or calculator, we find that this area is 0.0026 or 0.26%.

Hence, the probability that a loaf of bread chosen at random will have a mass of more than 450g is 0.0026 or 0.26%.

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Answer:

D.400 watt

Explanation:

where Pave = average power

Irms=RMS current &

Vrms=RMS voltage

Answer:

33.3m

Explanation:

Recall that for a regular wave, the relationship between, wavelength, frequency  and velocity (speed) is given by :

v = fλ,

where:

v = velocity (speed) of the wave = 50m/s

f = frequency of the wave = 1.5 Hz

λ = wavelength (we are asked to find this)

simply substitute the given values into the equation:

v = fλ

50 = 1.5 λ,

λ = 50/1.5

λ = 33.3m

Answer:

See below

Explanation:

You didn't show the e-magnet construction diagram....but:

If the e-magnet is built properly and has current flowing through the coils, it will affect the compass.....also note that a compass is a magnet, so if the e-magnet is ferrous (iron-containng)  material it will affect the compass ....current flowing or not !

Answer:

graph of cosine function

Explanation:

f(x) = sin(x)

The curve of the sine function crosses the y-axis at the origin, heads up to y = 1 at x = π/2 and down to y = -1 at x = 3π/2.

Domain: (-∞, ∞)

Range: [-1, 1]

f(x) = cos(x)

The curve of the cosine function crosses the y-axis at (0, 1) which is its maximum, heads down to y = -1 at x = π then heads up again.

Domain: (-∞, ∞)

Range: [-1, 1]

Given information:

If the wheel starts when time t = 0 seconds, and they begin their journey at the top of the wheel (the maximum point), the most appropriate graph to model their ride is the graph of the cosine function since it is at its highest point when x = 0.

Answer: if the door knob is metal the static electricity will exit your body, but shock you in the process

Explanation:

Compact fluorescent light usually has a B. Longer life compared to an incandescent bulb producing the same number of lumens.

CFLs are designed to be more energy-efficient than incandescent bulbs. They use less energy to produce the same amount of light, which makes them more efficient. This efficiency leads to a longer lifespan for the CFL compared to incandescent bulbs. In general, a CFL can last up to 10 times longer than an incandescent bulb.

To summarize:
- A compact fluorescent light (CFL) has a longer life compared to an incandescent bulb producing the same number of lumens.
- This is due to the higher energy efficiency of CFLs, which allows them to use less energy and have a longer lifespan.

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(a) The work done by tension is 0 J.

(b) The work done by gravity is -30.7 J.

(c) The work done by the normal force is 0 J.

(d) The increase in thermal energy of the crate and incline is 30.7 J.

(a) The tension in the rope is perpendicular to the displacement of the crate, so the work done by tension is zero. This is because work is defined as the dot product of force and displacement, and when the angle between the force and displacement vectors is 90 degrees, the work done is zero.

(b) The work done by gravity can be calculated by considering the component of the weight of the crate that acts along the incline. The gravitational force can be split into two components: one parallel to the incline (mg * sin θ) and one perpendicular to the incline (mg * cos θ). The work done by the component parallel to the incline is given by the formula W = force * distance * cos θ. Substituting the values, we get W = (-mg * sin θ) * distance * cos θ = -30.7 J.

(c) The normal force exerted by the incline is perpendicular to the displacement of the crate, so the work done by the normal force is zero.

(d) The increase in thermal energy of the crate and incline is equal to the negative of the work done by gravity. This is due to the conservation of mechanical energy. The work done by gravity is negative because the force of gravity acts opposite to the displacement of the crate. Therefore, the increase in thermal energy is 30.7 J.

It's important to note that the negative sign in the work done by gravity indicates that work is done against gravity, resulting in a decrease in the mechanical energy of the system. The increase in thermal energy represents the energy dissipated as heat due to friction between the crate and the incline.

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Answer:

An Electric "charge" is a property of matter that causes a force to repel or attract when placed into a magnetic field. These charges can be replicated into positive and negative electrons when made from a chemical reaction.

Answer:

an electri

Explanation:

Answer:

Potential energy is the stored energy of position possessed by an object. In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth) - sometimes referred to as the acceleration of gravity.

Explanation:

Answer:

fiction

Explanation:

When two opposite forces act perpendicular to an axis, it causes rotational motion or torque.

Torque and couple are both related to rotational motion and are often used interchangeably, but they refer to slightly different concepts.

Torque is a measure of the force that causes an object to rotate around an axis or pivot point.

It is equal to the force applied multiplied by the perpendicular distance between the axis and the line of action of the force. Torque is a vector quantity, meaning it has both magnitude and direction. Its unit of measurement is Newton-meters (Nm) or foot-pounds (ft-lbs) in the English system.

A couple, on the other hand, is a pair of equal and opposite forces that act on a body but do not cause it to translate. Instead, they create a pure rotational motion.

A couple generates torque, but unlike a single force, it doesn't have a line of action or a specific point of application. Instead, a couple is characterized by its magnitude and the distance between the forces. Couples are often used in mechanics to model rotational systems and analyze the behavior of rotating bodies.

Torque is the measure of the force that causes rotational motion, while a couple is a pair of forces that create pure rotational motion without causing any translation.

Therefore, If two opposite forces act perpendicular to an axis, it causes rotational motion or torque.

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The group of stars that represents stars fusing hydrogen in their cores is known as the main sequence. This is the phase in a star's life cycle where the fusion of hydrogen into helium occurs in the stellar core.

Main sequence stars are the term used to describe the class of stars that fuse hydrogen in their centres. These stars, like our Sun, are in a stable stage of their evolution when the pressure from nuclear fusion reactions acting outside the star balances the gravitational pull coming from within. Protons unite to create helium nuclei during a process known as proton-proton fusion, which releases enormous amounts of energy in the form of heat and light.

Main sequence stars are distinguished by their hydrogen fusion in their cores, which is comparatively steady and persistent. The length of this phase varies with the star's mass, with more massive stars lasting less time during this phase because of their higher fusion rates. Depending on their mass, stars undergo several phases of evolution following the exhaustion of the hydrogen fuel in their cores, such as red giants or supernovae.

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Answer: 30

Explanation:

Answer:

It has to be the "New Moon" because that is when the moon is between the sun and the earth.

A lunar eclipse can occur when the earth is between the sun and the moon.

The correct answer is C, which states that reversing the clips from the battery and flipping the magnet over will reverse the direction of motor spin.

A motor is a device that converts electrical energy into mechanical energy. This is accomplished through the interaction of a magnetic field with the electrical current flowing through it, resulting in a force that turns the motor's rotor. This spinning motion is commonly used to power a variety of devices, including fans, pumps, and conveyor belts.

The direction of a motor's spin can be reversed by reversing the polarity of the electrical current flowing through it. This can be accomplished in a variety of ways, but two of the most common are reversing the clips from the battery and flipping the magnet over. If both of these changes are made, the motor will spin in the opposite direction.

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Answer:

A. Increased self-esteem

Explanation:

I hope this helps :)

The number of revolutions that the wheel has to make to travel 4.55 miles is 3214 revolutions.

The number of revolutions made by a circle of radius r to cover a distance s is s= 2 πr. In covering a distance s m, a circular wheel of radius r m makes s2πr revolution.

The diameter of the wheel is 725mm or 0.725 m. The distance the wheel has to go is x=4.55 miles or 7323 m.

The circumference of the wheel is πD where D is the diameter. Therefore the number of revolutions to travel distance X is no. of revolution = X/(πD). So if D = 0.725m  and X = 7323m. Then the number of revolutions = 7323/(π x 0.725) = 3213.85 revolutions or 3214 revolutions.

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Explanation:

Store size, cost savings, and repair costs are all important financial impact. which may impact Walmart decision to switch to LED lighting.

Understanding how different components of a system or situation interact in complex and changing ways is known as financial impact. A change in the organization has an impact on other elements of the system. We can see that upgrading to LED lighting has an effect on other parts of the overall system in the Walmart scenario. Yet, the addition of LED illumination has no impact on the expenditures related to buying shop inventory or printing ads for weekly circulars. One factor that is dependent on other factors is a contingency. Managers can decide how to react to a situation by identifying critical contingencies. Walmart executives may decide that installing LED lighting in stores with less than 80,000 square feet is not cost-effective.

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A.1.2°C

The First Law of Thermodynamics states that heat is a form of energy, and thermodynamic processes are therefore subject to the principle of conservation of energy.

To find internal energy, you have to add the heat added in the system and work done in the system because the work done is not lost but rather it is added in the system.

Step 1

a)let

to add the energy it must have the same measure unit, so let's convert calories into Julies

remember that

b) now, replace in the formula

now, we have the change of internal energy

Step 2

now, let's find the change in temperature

Use the calorimetry formula.

where m is the mass, Q = heat energy, c = specific heat capacity, and ∆T = change in temperature

a)

let

now,

so, the answer is

A.1.2°C

The initial speed of a 0.5 kg arrow when it is fired from the bow is equal to 20 m/s.

Kinetic energy can be described as the energy carried by a moving body due to its motion. Work should be done on the object in order to bring the change in the kinetic energy of a moving object.

The kinetic energy of an object can be determined from the mathematical formula:

K.E. = ½ mv²    

Where ‘v’ is the object's velocity and ‘m’ is the object's mass.

Given, the mass of the arrow, m = 0.5 Kg

The work done = kinetic energy = 100 J

The kinetic energy = (1/2)× m ×(v)²

100 = (1/2)× 0.5 ×(v)²

v² = 400

v = 20 m/s

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