Jeremy walked at an average rate of speed of 3 kilometers per hour (km/h). How far had jeremy walked in 30 minutes? 0. 1 km 0. 1 km 1. 5 km 1. 5 km 10 km 10 km 90 km.

When a pd of 24v is applied to the network of resistors from a battery, it will cause a flow of current through the circuit. The value of the current will depend on the total resistance of the network of resistors and the voltage applied.

The battery is the source of energy that provides the potential difference (pd) across the circuit. The pd is the driving force that causes the current to flow through the resistors.
It is important to note that the pd provided by the battery must be greater than the sum of the voltages across each resistor in the network for the current to flow. If the pd is not sufficient, the current will not flow, and the circuit will not work.
The battery must have a sufficient voltage to provide the required pd, and it must also have sufficient capacity to maintain the pd over time. The capacity of the battery will depend on its size and the amount of energy it can store. If the battery is too small or has low capacity, it may not be able to provide the pd required for the circuit to work.
In conclusion, when a pd of 24v from a battery is applied to the network of resistors, it will cause a flow of current through the circuit, provided that the battery has sufficient voltage and capacity.

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ANSWER:

1.757 mm

STEP-BY-STEP EXPLANATION:

The coefficient of linear expansion is given by the following formula:

Where α = coefficiente of linear expasion, ΔL = change in lenght, ΔT = change in tempetature

Solving for ΔL:

Replacing and we calculate the change in lenght:

The change in length is 1.757 mm

Answer:

Average velocity

The average velocity of an object is its total displacement divided by the total time taken. In other words, it is the rate at which an object changes its position from one place to another. Average velocity is a vector quantity. The SI unit is meters per second(m/s).

Example of Average velocity

Someone who takes 40 minutes to drive 20 miles north and then 20 miles south (to end up at the same place), has an average speed of 40 miles divided by 40 minutes, or 1 mile per minute (60 mph). Average velocity, however, involves total displacement, instead of distance.

Relative velocity

The velocity of an object A relative to another object B is the velocity that objects A would appear to have to an observer moving with B. One obvious example of this is to work out how long it will take two objects traveling along a line at different velocities to collide

Example of Relative velocity

You are in a bus and it goes with a velocity of 50 m/s to the east, then a truck passes you with a velocity of 60m/s to the east. Velocity of the moving objects with respect to other moving or stationary object is called “relative velocity” and this motion is called “relative motion”.

The 14.317 g sample of sodium sulfate, you have approximately 6.058 × 10^22 molecules of sodium sulfate.

To find the number of molecules of sodium sulfate in a sample, you need to use Avogadro's number and the molar mass of sodium sulfate.
1. Calculate the number of moles of sodium sulfate in the sample by dividing the given mass (14.317 g) by the molar mass of sodium sulfate.

The molar mass of sodium sulfate is 142.04 g/mol.
  Number of moles = mass / molar mass
                 = 14.317 g / 142.04 g/mol
                 = 0.1007 mol (rounded to four decimal places)

2. Use Avogadro's number,

which is 6.022 × 10^23 molecules/mol, to convert the number of moles of sodium sulfate to molecules.
  Number of molecules = number of moles × Avogadro's number
                      = 0.1007 mol × 6.022 × 10^23 molecules/mol
                      ≈ 6.058 × 10^22 molecules

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Two methods can be used to find the total flight time of a projectile: exploiting symmetry (for level ground) or using the y position equation. In this case of firing over level ground, the height at the end of the trajectory (yr) is the same as the initial height.

In this problem, we can find the total flight time, tr, of a projectile using two different methods. The first method involves exploiting the symmetry of the problem when the projectile is fired over level ground. The second method is more general and involves finding a general expression for the y position of the projectile, y(t), and setting it equal to the height at the end of the trajectory, yr.

To find the value of yr in this problem, we need to consider the height at the end of the trajectory. Since the projectile is fired over level ground, the height at the end of the trajectory is equal to the initial height of the projectile. Therefore, the value of yr is the same as the initial height from which the projectile was launched.

In summary, when finding the total flight time of a projectile, we can use either the symmetry of the problem (limited to projectiles fired over level ground) or a more general method involving the y position of the projectile. In this particular problem, where the projectile is fired over level ground, the height at the end of the trajectory (yr) is equal to the initial height from which the projectile was launched.

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Answer:86,400

Explanation:

Answer:

2 1/4

Explanation:

Answer:

\({ \rm{ = \frac{1}{2} ( - 1 \frac{3}{4} - ( - 2 \frac{1}{2})) }} \\ \\ = { \rm{ \frac{1}{2} ( \frac{3}{4}) }} \\ \\ = { \rm{ \frac{3}{8} }}\)

The phase change that involves the absorption of heat is endothermic phase transitions, such as melting and evaporation.

In endothermic phase transitions, substances absorb heat energy from their surroundings, causing molecular vibrations to increase. During melting, a solid substance gains heat energy, breaking the bonds holding its molecules in a rigid structure, and transitioning into a liquid state.

Similarly, in evaporation, a liquid substance absorbs heat, which enables its molecules to overcome the intermolecular forces, and turn into a gaseous state. In both cases, the absorption of heat energy is crucial for the phase change to occur.

These processes are in contrast to exothermic phase transitions, like freezing and condensation, where heat energy is released.

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The total kinetic energy before the collision, the spring potential energy, and the kinetic energy after the collision would be equal.

When comparing the kinetic energy before the collision, the spring potential energy, and the kinetic energy after the collision, a long explanation is necessary to make a proper comparison. Let's explore the different energies involved and the expected outcomes:Kinetic energy before the collision Before the collision, the system has a total kinetic energy of 1/2 mv², where m is the mass of the object and v is its velocity.

This energy is purely kinetic energy because the object is moving. So the total energy before the collision is only kinetic energy.Spring potential energyThe spring potential energy is the energy stored in a spring when it is stretched or compressed. It is equal to 1/2 kx², where k is the spring constant and x is the displacement from the equilibrium position. When the spring is compressed or stretched, it stores energy in the form of potential energy, which can be used to do work.

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During the low pressure phase, the semilunar valves close to prevent the backflow of blood into the ventricles from the great vessels. This is the moment when the second heart sound is heard.

1. During the low pressure phase, the ventricles relax (diastole).
2. As the pressure in the ventricles drops, blood starts to flow back towards them from the great vessels (aorta and pulmonary artery).
3. To prevent the backflow of blood, the semilunar valves (aortic and pulmonary valves) close.
4. The closure of the semilunar valves produces the second heart sound, also known as the "dub" in the "lub-dub" pattern of the heartbeat.

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Answer:

Mass is to gram

Explanation:

There is always a potential that an abrasive power tool's wheel wasn't sound and may burst or disintegrate, thus neither the operator nor anyone else should ever stand in front of the wheel as it accelerates to full operational speed. So, C is the best choice.

Before mounting, all abrasive wheels must undergo a thorough inspection and ring test to make sure there are no fractures or other flaws. The spindle's grinding wheels must easily fit on it without being pressed in.

The spindle nut should only be tightened enough to secure the wheel. The following are a few recommendations for using abrasive wheels: The spindle end, nut, and flange projection guards on abrasive wheel tools must be covered. Keep the wheel in the right alignment. Never use more force than the fastenings can handle.

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Answer: 7/2, 3.5 and   1

                                   3-----

                                        2

based on the condition given condition, formulate;

30-23/2

Calculate: 30-23/2

Answer:

what do u need help with

Explanation:

Pа: 5. Mass of the earth is 6x10-kg and its radius is 6400km. What is the mass of a man weighting 977N? (99.99kg) ma. Orth be​.

Answer:

Explanation:

The speed of the car can be found by using the formula

\(s = \frac{d}{t} \\ \)

d is the distance

t is the time

From the question we have

\(s = \frac{125}{2} = 62.5 \\ \)

We have the final answer as

Hope this helps you

The time it takes one to move from one place to another daily, can be used to quantify motion. Speed is used to quantify how fast an object moves.

What is motion?

This is the displacement with time of the position or orientation of a body. The displacement can be along a straight line or a curve.

Hence from the definition of motion, we can see that motion is dependent on time. We quantify motion by measuring the distance and dividing it by the time taken to move.

Speed measures how fast an object is moving through a distance, and it is calculated using this formula:

S= Δd/ Δt,

where S stands for speed,

d stands for distance, and

t stands for time.

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The problem states that the rate at which the intensity of a vertical beam of light decreases in a transparent medium is proportional to the thickness of the medium. It is given that in clear seawater, the intensity 1 meter below the surface is 25% of the initial intensity of the incident beam. The task is to find the intensity of the beam 6 meters below the surface.

Let's denote the initial intensity of the incident beam as I₀. According to the given information, the intensity 1 meter below the surface is 25% of I₀, which means it is 0.25I₀.

Since the rate of intensity decrease is proportional to the thickness of the medium, we can set up a proportion using the ratio of intensities:

I₁ / I₀ = \(e^{-kt}\)

where I₁ is the intensity at a depth of t meters, and k is the proportionality constant.

To find the intensity 6 meters below the surface, we substitute t = 6 into the equation:

I = I₀ *  \(e^{-6k}\)

We don't have the specific value of k or I₀, but we can still determine the ratio of intensities:

I / I₀ =  \(e^{-6k}\)

Using the given information, we can write the equation:

0.25I₀ / I₀ =  \(e^{-6k}\)

Simplifying the equation, we find:

0.25 = \(e^{-6k}\)

To solve for the intensity I, we substitute this value back into the equation:

I = I₀ * 0.25.

Therefore, the intensity of the beam 6 meters below the surface is 0.25 times the initial intensity I₀.

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Answer:

a)  E_{z} = 0, b) E_{z} = 0, c)    z = 1.73 [1 + \(\sqrt{1 - \frac{4R^2}{3} }\)], d)   \(E_{max}\)Emax = 9.7  10¹⁰ N / C

Explanation:

For this exercise we use the expression

          E = k ∫ dq / r²

By applying this expression to our problem of a ring of radius R, with a perpendicular axis in the z direction, we can calculate the electric field for a small charge element

          dE = k dq / r²

In the attachment we can see a diagram of the electric field, it is observed that the fields perpendicular to the z axis cancel and the field remains in the direction of the axis

           d\(E_{z}\)= dE cos φ

we substitute

         E_{z} = k∫  \(\frac{dq}{r^2}\)  cos φ

let's write the expressions

          r² = R² + z²

          cos φ = z / r

we substitute in the integral, where we see that the load differential does not depend on the distance and the value of the total load is + Q

          E_{z} = k  \(\frac{1}{ (R^2 +z^2) } \ \frac{z}{ (R^2 + z^2)^{1/2} }\) ∫  dq

          E_{z} = k Q  \(\frac{z}{ (R2+z^2)^{3/2} }\)  

This is the expression for the electric field in the axis perpendicular to the ring, we analyze this expression to answer the questions

a) the magnitude of the field at z = 0

         E_{z} = 0

b) the magnitude of the field for z = inf

        when z »R the expression remains

          E_{z} = k \(\frac{z}{z^{3} }\) Q

          E_{z} = k Q \(\frac{1}{z^2}\)

therefore when the value of z = int the field goes to E_{z} = 0

c) In value of z for which the field is maximum.

    We have an extreme point when the first derivative is equal to zero

     \(\frac{dE_z}{dz } = k Q [ (R^2 +z^2)^{3/2} - z \ 3 \frac{z}{ (R^2 +z^2)^{1/2} } = 0\)

we solve

    (R² + z²)^{ 3/2} = 3 z² /(R² +z²) ^{1/2}

    (R² + z²)² = 3z²

    r² + z² = √3    z

    z² –1.732 z + R² = 0

we solve the quadratic equation

       z = [1.732 ± \(\sqrt{3 - 4R^2}\)]/ 2 = [1.73 ± 1.73 \(\sqrt{ 1 - \frac{4 R^2}{3} }\)   ] / 2

       z = 0.865 [1 ± \(\sqrt{1 - \frac{4R^2}{3} }\)]

Therefore there are two points where the field has an extreme point one, one is a maximum and the other a minimum, as we have already determined a minimum at z = 0 the maximum point must be

  z = 0.865 [1 + \(\sqrt{1 - \frac{4R^2}{3} }\)]

d) the value of Emax

         z₁ = 0.865 [1+\(\sqrt{1 - \frac{4 \ 0.04^2}{3} }\)) = 1.73 [1 + √0.99786]

          z₁ = 1.729 m

         z₂ = 0.865 [1 - √0.99786 ]

         z₂ = 0.0011 m≈ 0

for which the field has a maximum value substituting in equation 1

            \(E_{max} = 9 10^9 \ 9 \ \frac{1.729}{(0.04^2 + 1.729^{3/2})}\)

            \(E_{max}\) = 81 10⁹   \(\frac{1.729}{1.4408}\)

            \(E_{max}\)Emax = 9.7  10¹⁰ N / C

Answer:

v = 4.39968 m/s

v = 9.8418038654259 mi/h

v = 14.434645669291 ft/s

v = 15.838846732892 km/h

Explanation:

v=KE/1/2m

The noise level is I=1029 I=log2 times over the threshold of human hearing.

Logarithmic scales are used to measure decibels. This is a method of accounting for or measuring an exponentially growing quantity. For instance, every 10 dB increase in decibels corresponds to a 10-fold increase in sound pressure level (SPL).

The formula for sound speed is vw=f, where f is sound frequency and is sound wavelength. The distance between adjacent, identical wave components, such as between adjacent compressions, determines a sound's wavelength.

The hertz is the SI unit for frequency (Hz). One cycle per second equals one hertz.

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Answer:

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To calculate the approximate thermal energy in kilojoules per mole (kJ/mol) of molecules at a given temperature, you can use the Boltzmann constant (k) and the ideal gas law.

The Boltzmann constant (k) is approximately equal to 8.314 J/(mol·K). To convert this to kilojoules per mole, we divide by 1000:

k = 8.314 J/(mol·K) = 0.008314 kJ/(mol·K)

Now, we need to convert the temperature to Kelvin (K) since the Boltzmann constant is defined in Kelvin. To convert from Celsius to Kelvin, we add 273.15 to the temperature:

T(K) = 75°C + 273.15 = 348.15 K

Finally, we can calculate the thermal energy using the formula:

Thermal energy = k * T

Thermal energy = 0.008314 kJ/(mol·K) * 348.15 K

Thermal energy ≈ 2.894 kJ/mol

Therefore, at 75°C, the approximate thermal energy of molecules is approximately 2.894 kilojoules per mole (kJ/mol).

The heat capacity of one mole of water is approximately 75.29/1000 = 0.07529 kj/mol. This value represents the approximate thermal energy in kj/mol of water molecules at 75 ° C.

Thermal energy refers to the energy present in a system that arises from the random movements of its atoms and molecules. When a body has a temperature of 75 ° C, it has a thermal energy that depends on the type of molecules in it and their specific heat capacity.

In this context, we will consider the thermal energy in kj/mol of molecules at 75 ° C.Let's use water as an example to calculate the approximate thermal energy in kj/mol of molecules at 75 ° C. The specific heat capacity of water is 4.18 J/g °C, and the molar mass of water is 18.01528 g/mol. Therefore, the thermal energy in kj/mol of water molecules at 75 ° C can be calculated as follows:ΔH = mcΔt, whereΔH = thermal energy,m = mass of the sample,c = specific heat capacity of the sample,Δt = change in temperature

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The most likely cause of a change in action potential shape is alterations in ion channel activity, which affect the flow of ions across the cell membrane.

Action potentials are electrical signals generated by excitable cells, such as neurons and muscle cells, to transmit information. The shape of an action potential is determined by the coordinated opening and closing of ion channels, which allow the selective passage of ions across the cell membrane. Any disruption in ion channel activity can lead to changes in the action potential shape.

Several factors can cause alterations in ion channel activity. Mutations in ion channel genes can result in dysfunctional channels that fail to open or close properly. This can lead to prolonged depolarization or repolarization phases, resulting in a change in the action potential shape. Additionally, changes in the concentration of ions, such as potassium or calcium, can impact the activity of ion channels, leading to modifications in the action potential waveform.

External factors, such as drugs or toxins, can also influence ion channel activity and subsequently affect action potential shape. For example, certain medications can block specific types of ion channels, altering the membrane potential and changing the action potential morphology. Similarly, toxins produced by bacteria or other organisms can interfere with ion channel function, leading to abnormal action potentials.

In summary, alterations in ion channel activity caused by genetic mutations, changes in ion concentrations, drugs, or toxins are the most likely causes of changes in action potential shape. These disruptions can affect the flow of ions across the cell membrane and result in modifications to the characteristic waveform of action potentials.

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Answer:

A

Explanation:

Answer:

it is 12.15 km

Explanation:

1215 km ÷1000

=12.15

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False

Virtual image cannot be caught on a screen

Answer:

Scientific theories attempt to explain how events occur in the natural world.

Answer:

The answer is option  A. Scientific theories attempt to explain an entire group of related phenomena.

Explanation:

I got it right on the test

Hope it helps!

The volume of a sphere with radius r is V = (4/3)πr³, and the surface area of the sphere is S = 4πr². T

Given a sphere with radius r, the  answer is: The volume of the sphere is V = (4/3)πr³.

The surface area of the sphere is S = 4πr².

The volume of a sphere is the amount of space inside a sphere. To determine the volume of a sphere, we use the formula:V = (4/3)πr³Where "r" is the radius of the sphere.

So, the volume of the sphere is V = (4/3)πr³.

The surface area of a sphere is the sum of all of its surface areas. To determine the surface area of a sphere, we use the formula:S = 4πr²Where "r" is the radius of the sphere.

So, the surface area of the sphere is S = 4πr².\

In conclusion, the volume of a sphere with radius r is V = (4/3)πr³, and the surface area of the sphere is S = 4πr². The given sphere is a 3-dimensional object that has a circular boundary. To find the volume and surface area, we have used the above formulas, which involves only the radius "r" of the sphere.

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The direction of this current's magnetic force on an electron that is moving perpendicular to the page and outward from it on the left side of the wire is downward.

What is Magnetic force?

The force exerted by a magnetic field on a moving charged particle is known as a magnetic force. It is described by the formula F = q(v x B), where F is the magnetic force, q is the particle's charge, v is the particle's velocity, and B is the magnetic field.

The right-hand rule states that when a wire-carrying current is held in the right hand with the thumb pointing in the direction of the current, the fingers will curl in the direction of the magnetic field lines created by the current.

The magnetic field lines will create clockwise circles around the wire because, in this instance, the current flows from the top of the page downward.

Now imagine an electron on the left side of the wire traveling perpendicular to the page. The electron will experience a magnetic force since it travels in a direction perpendicular to both the magnetic field and the current.

We can use the left-hand rule for a negative charge to determine the direction of this force. If the left hand is held with the fingers pointing toward the magnetic field and the thumb pointing toward the electron's velocity, the palm will face the order of the force on the electron.

The thumb points to the left because the electron leaves to the left. The fingers curl because the magnetic field lines go clockwise around the wire. Therefore, the magnetic force acting on the electron is directed downward because the palm is facing downward.

Therefore, the magnetic pull exerted by this current on an electron traveling outward and perpendicular to the page on the wire's left side is directed downward.

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Answer:

Look below.

Explanation:

If additives are having negative effects on health and the environment, it would be wise to not use detergents containing these additives. These additives could threaten living things such as humans and animals.

There is concern that extra additives in detergents can have negative health and environmental impacts, then it would be very unwise to use detergents containing these additives

It can be defined as the origination of the contaminant substance that poisonous or harmful to our natural environment.

There are several types of pollution that exist in our nature depending on the state and composition of the contaminant, for example, water pollution can exist due to the eutrophication process.

It would be quite unwise to use surfactants that include these additional ingredients since there is fear that they might have a harmful influence on your well-being and the environment.

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