Question 3
A mover pushes a box with 400N a distance of 3m in 55s.
a -Calculate the work:
b- Calculate the Power

Answer:

I think 5 Newtons to the right.

Answer:

5

52.386552

Explanation:

5 Newton is right

Given:

The time period for which Nora rides the bicycle, t=5 min

The speed of the bicycle, s=10 m/s

To find:

The description of the ride.

Explanation:

The speed is a scalar quantity and has only magnitude. The velocity and acceleration are vector quantities and have magnitude and direction.

When the bicycle is traveling on a curved path at a constant speed, there will be an acceleration acting on it which keeps it on its path. This acceleration is called the centripetal acceleration.

The centripetal acceleration changes only the direction of the velocity and not the magnitude. Thus the speed will be constant. But the velocity will be changing at a constant acceleration.

First, for this problem, we will need to know the formula for time dilation

Where t is the time in the reference frame on earth

t0 is the time on the ship

v is the velocity relative to lightspeed

and c is light speed in a vacuum

For this problem, we will need to convert .93x10^8 to a fraction of light speed.

.93x10^8 = .31c

Now, we can plug in the numbers we get from the given

t0 = 6 hours since the ship has been in the air for 6 hours

t = 6.31089

For the answer to be valid, we will convert .31089 to minutes by multiplying it by 60 (60 minutes in a hour)

18.654 minutes

Approximately 47.37% of the soil volume is pore space, and approximately 52.63% is solid particles.

To calculate the percentage of pore space and solid particles in the soil volume, we can use the following formula:

Pore space percentage = ((Particle density - Bulk density) / Particle density) x 100

Solid particles percentage = 100 - Pore space percentage

Given:

Bulk density = 1.4 Mg/m³

Particle density = 2.66 Mg/m³

Substituting the values into the formulas:

Pore space percentage = ((2.66 - 1.4) / 2.66) x 100

Solid particles percentage = 100 - Pore space percentage

Calculating the values:

Pore space percentage ≈ 47.37%

Solid particles percentage ≈ 52.63%

Therefore, approximately 47.37% of the soil volume is pore space, and approximately 52.63% is solid particles.

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An object weighing 254.4 N and inclined at a 40° angle has a gravitational pull of 2380.5.

The formula of a Force is F=Mg.

Where M is the mass of an object, and g is the gravity.

\(F_{1}\)=254.4× 10, Value of gravity ≈ 10.

  = 2544

Here F ≠ Mg, due to an angle of 40°.

∴ \(F_{ax}= mass. cos \alpha\) .

 =  254.4× cos 40

As cos40 =0.766

=  254.4 ×  0.766

= 194.88

To find a Normal force, use the formula of  Gravitational pull.

\(F_{total} = F_{1}-F_{bx}\) , here \(F_{bx} = M. sin\alpha\) =163.5

= 2544-163.5

=2380.5

Hence Gravitational pull is 2380.5

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Answer: The pH of the solution after 50.5 mL of 0.100 M KOH has been added is 16.85.

The reaction between acetic acid and potassium hydroxide (KOH) is given by the equation:

CH3COOH + KOH → CH3COOK + H2O.

It can be observed that for every mole of KOH added, one mole of H+ from CH3COOH reacts with one mole of OH- from KOH to produce one mole of H2O. Therefore, after the addition of n moles of KOH, the number of moles of H+ remaining is (0.200 - n) moles (since 0.200 M is the initial concentration of acetic acid). On the other hand, the number of moles of CH3COOK produced is also n moles; thus the final concentration of CH3COOK is n/V (where V is the total volume of the solution).

The reaction produces a salt (CH3COOK), which is neutral. Therefore, the final pH is given by: pH = pKa + log([A-]/[HA]) where A- is CH3COOK and HA is CH3COOH.

To find the pH of the resulting solution after the following volumes of KOH have been added, we need to calculate the number of moles of KOH added, the number of moles of CH3COOK produced, the number of moles of CH3COOH remaining, and the total volume of the solution. Then we can use the Henderson-Hasselbalch equation above to find the pH.

Here are the calculations: Initial number of moles of CH3COOH = M × V = 0.200 × 0.100 = 0.020 moles. For each mole of KOH added, one mole of CH3COOH reacts with one mole of KOH to produce one mole of CH3COOK.Number of moles of KOH added Volume of KOH added (mL)Moles of KOH added0.02 0.00 (initial) 0.000.02 10.10 0.010.02 20.20 0.020.02 30.30 0.030.02 40.40 0.040.02 50.50 0.05Number of moles of CH3COOK produced = number of moles of KOH added = n moles. Concentration of CH3COOK produced = n/V = n/(Vinitial + V added) = n/(0.100 L + V added)

Number of moles of CH3COOH remaining = initial number of moles - number of moles of KOH added = 0.020 - n moles. Total volume of the solution after the addition of KOH = V initial + V added = 0.100 L + V added. We can then use the Henderson-Hasselbalch equation to find the pH: pH = pKa + log([A-]/[HA])where A- is CH3COOK and HA is CH3COOH.pKa of acetic acid = 4.76

Let's tabulate the values of n, [A-], [HA], and pH for each volume of KOH added: Number of moles of KOH added n (moles)Concentration of CH3COOK produced [A-] (M)

Number of moles of CH3COOH remaining [HA] (M)pH0.000.000.020.76 (initial)0.010.010.019.84 0.020.020.018.98 0.030.030.018.20 0.040.040.017.49 0.050.050.016.85.

The pH of the solution after 50.5 mL of 0.100 M KOH has been added is 16.85.

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For the given problem, we are given the velocity of water in the z direction as a function of radius and other parameters such as temperature and radius. We need to find the volumetric flow rate, mass flow rate and average velocity of the water. Let's solve these quantities one by one.Volumetric flow rate

The volumetric flow rate is given as,Q= Av where Q is the volumetric flow rate, A is the cross-sectional area of the pipe and v is the velocity of the water through the pipe. Since the velocity is a function of the radius, we can assume that the cross-sectional area of the pipe is the same for all radii. The cross-sectional area of the pipe is given as: A=πr²Q=πr²vThe radius of the pipe is given as R=0.5m. The maximum velocity of the water is given as Vmax=3m/s. The velocity is a function of radius, so we can assume that at r=0, v=0. The maximum velocity occurs at r=R and v=Vmax.So, we can write the velocity as:v=Vmax(1-(r/R)²)So, the volumetric flow rate is given as:Q=πr²v=π(0.5)² × 3(1- (r/0.5)²)Volumetric flow rate is given byQ = πR^2Vmax/4=π(0.5)^2 × 3/4=0.59 m³/sMass flow rateThe mass flow rate is given as,ρ=ρv where ρ is the density of water, v is the velocity of the water and A is the cross-sectional area of the pipe. Since the cross-sectional area of the pipe is the same for all radii, we can write the mass flow rate as:ρ = Q/AVolumetric flow rate is given byQ = πR^2Vmax/4=π(0.5)^2 × 3/4=0.59 m³/sCross-sectional area is given by,A = πR^2= π (0.5)^2 = 0.79 m²Density of water at 20°C is 998 kg/m³ρ = Q/AVolumetric flow rate Q = 0.59 m³/sCross-sectional area A = 0.79 m²Density of water ρ = 998 kg/m³ρ = 0.59 / (0.79 × 998) = 0.000747 kg/sAverage velocityThe average velocity is given as:Vav=Q/AThe volumetric flow rate is given as Q = πr²vWe can assume that the cross-sectional area of the pipe is the same for all radii. So, the cross-sectional area of the pipe is given as A=πR²The radius of the pipe is given as R=0.5m.So, we can write the velocity as:v=Vmax(1-(r/R)²)So, the volumetric flow rate is given as:Q=πr²v=π(0.5)² × 3(1- (r/0.5)²)Volumetric flow rate is given byQ = πR^2Vmax/4=π(0.5)^2 × 3/4=0.59 m³/sCross-sectional area is given by,A = πR^2= π (0.5)^2 = 0.79 m²The average velocity is given as:Vav=Q/AVolumetric flow rate Q = 0.59 m³/sCross-sectional area A = 0.79 m²Vav=0.59/0.79 = 0.75 m/sThus, the volumetric flow rate, mass flow rate, and average velocity of the water through the pipe are 0.59 m³/s, 0.000747 kg/s, and 0.75 m/s respectively.

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The distance δz between two surfaces separated by a potential difference δv is given by the equation δz = εAδv/Q, where A of plates, the charge stored Q, and permittivity ε of material between the plates.

The distance δz between two surfaces separated by a potential difference δv can be determined using the equation for capacitance. Capacitance is a property of a system that relates the potential difference across it to the amount of charge it can store. The formula for capacitance is given by C = Q/δv, where C represents the capacitance, Q is the charge stored, and δv is the potential difference.

If the surfaces are plates of a parallel plate capacitor, the capacitance can be expressed as C = εA/δz, where ε is the permittivity of the material between the plates, A is the area of the plates, and δz is the distance between them. By equating the two equations for capacitance, we can solve for δz:

εA/δz = Q/δv

Rearranging the equation, we find δz = εAδv/Q. This equation relates the distance δz between the surfaces to the potential difference δv, the area A of the plates, the charge stored Q, and the permittivity ε of the material between the plates.

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Answer:

Color, Streak, luster, cleavage and fracture, hardness, crystal shape, and density.

Explanation:

51 Km/h with velocity  the truck is  moving.

KE = 1/2mv^2

(23)(1/2)×1000×15^2 = (1/2)2000×v^2

v = \(\sqrt(15*15*23/2)\) = 50.867km/h => 51km/h

velocity is the measurement of a body's "pace of change of displacement in relation to time" when the body is traveling along a straight route.

velocity is a vector. As a result, when the displacement to time ratio for linear velocity is determined, it provides both the direction and the magnitude.

Linear velocity and rotational velocity are two ways to categorize velocity. The linear velocity of a body moving in a straight line is the rate at which its displacement is changing. There is no dispute that every object in motion has a linear velocity. Angular velocity only applies to things traveling in circles, not to those on straight trajectories. The rate of change of the angular displacement with respect to time is referred to as the angular velocity.

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True im not 100% sure but I tried.

Value of current \(I_{b}\) is 82.9 A

A conductor carrying current generates a magnetic field around itself. In other words, it behaves like a magnet and develops a force when the magnet is brought into a magnetic field. Magnetic fields also exert equal and opposite forces on conductors through which current flows. A conducting conductor produces its own magnetic field and experiences a force when interacting with an external magnetic field.

When two energized wires are placed parallel to each other, their magnetic fields interact and exert a force between the wires. The force acting on each wire is the same in magnitude but opposite in direction. This is true even if the conductors carry currents of different magnitudes.

mg = \(\frac{4\pi * 10^{-7} }{4\pi }\) × \(\frac{2 I_{a}I_{b} l }{r}\)

Given, Iₐ =  130 A

m =  0.100 g/cm or 0.1×10⁻²g/m

So, by substituting values in the formula:

0.1×10⁻²× 9.8 = 10⁻⁷ ×\(\frac{2 * 130* I_{b} }{2.2 * 10^{-2} }\)

\(I_{b}\) =  82.9 A

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Answer:

blood picks up waste products such as carbon dioxide

returns to right atrium

moves to right ventricle and to lungs

blood travels from the lungs to the left atrium

carries oxygen and nutrients to the body cells

Explanation:

In the circulatory system, the blood carries the carbon dioxide to the right atrium of the heart through superior vena cava, then it move to right ventricle through tricuspid valve. The blood move to lungs following pulmonary artery and from lungs blood travels to the left atrium. From left atrium blood moves to the rest of the body through aorta and carries oxygen and nutrients to the whole body cells through.

Hence, the correct order is as follows:

blood picks up waste products such as carbon dioxide

returns to right atrium

moves to right ventricle and to lungs

blood travels from the lungs to the left atrium

carries oxygen and nutrients to the body cells

Answer:Kinetic energy from the mallet is transformed first to the orange ball and then to the purple ball.

Explanation:

The following would be observed Time would run faster on Earth due to the increased gravity field. Option A.

If the second moon's gravitational influence is extreme it can produce tremendous flood tides up to 1 kilometer high and frequent tsunamis. It can also lead to increased volcanic activity and earthquakes. The moon rotates in a circle around the earth due to its centripetal force.

Without the centripetal force, the Moon would not follow a circular orbit but would move in a straight line tangent to its orbit. Tides The gravitational pull of the moon pulls the earth especially the part closest to the moon. As a result of this force, the earth's crust rises slightly a few centimeters. Even ponds and lakes like the Great Lakes experience neap tides.

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Answer: b

Explanation:

Laura will increase the force she needs. When Laura puts her file cabinet on a small cart with wheels, the cart will experience less friction compared to the file cabinet directly resting on the ground. The correct answer is option D.

The presence of wheels reduces the contact area between the cart and the ground, leading to lower frictional forces. As a result, it becomes easier for the cart to move. However, the file cabinet still possesses its original mass, so to accelerate the cart (and the cabinet) to a certain speed or maintain a constant velocity, Laura will need to exert a greater force on the cart due to the reduction in friction. Therefore, the correct answer is D - Laura will increase the force she needs.

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Answer:

ΔE = 1.031 eV

Explanation:

For this exercise let's calculate the energy of the photons using Planck's equation

          E = h f

wavelength and frequency are related

         c = λ f

         f = c /λ

let's substitute

         E = h c /λ

let's calculate

         E = 6.63 10⁻³⁴ 3 10⁸/1064 10⁻⁹

         E = 1.869 10⁻¹⁹ J

let's reduce to eV

         E = 1.869 10⁻¹⁹ J (1 eV / 1.6 10⁻¹⁹ J)

        E = 1.168 eV

therefore the electron affinity is

         ΔE = E - 0.137

         ΔE = 1.168 - 0.137

         ΔE = 1.031 eV

The electron affinity of thulium in units of electron volts per atom is; ΔE ≈ 1.031 eV

From Planck's equation, we can find the energy of the photons when given wavelength as;

E = hc/λ

Where;

h is Planck's constant = 6.626 × 10⁻³⁴ J.s

c is speed of light = 3 × 10⁸ m/s

λ is wavelength

We are given;

wavelength; λ = 1064 nm = 1064 × 10⁻⁹ m

Thus;

E = (6.626 × 10⁻³⁴ × 3 × 10⁸)/(1064 × 10⁻⁹)

E2 = 1.868 × 10⁻¹⁹ J

Converting to eV gives;

E2 = (1.868 × 10⁻¹⁹)/(1.6 × 10⁻¹⁹)

E2 = 1.1675 eV

We are given E1 = 0.137 eV.

Now, electron affinity is simply change in energy. Thus;

ΔE = 1.1675 - 0.137

ΔE ≈ 1.031 eV

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The shuttle is under a force of 1.625 105N from the fuel. The force on a body expressed as a change in momentum is,

                     F= Δ\(\frac{p}{t}\)  (1)

Where,

F is the force that the shuttle is being subjected to from the fuel.

P represents the change in the shuttle's momentum.

t stands for the overall amount of time needed.

Considering our query,

ΔP= \(=325000=3.25X 10^{5} kg-m/s\)

t = 2 seconds

Equation (1) yields the following results when the necessary values are substituted:

\(F= \frac{3.25 10^{5} }{2}\)

\(F= 1.625\) x \(10^{5}\)N

Hence, 1.625105N is the force the fuel is exerting on the shuttle. The amount of motion a body has is referred to as momentum. Given that momentum relies on both velocity and the vector of the body's motion, it really is quantified as "mass speed". As acceleration and mass are both scalar quantities, vector quantities include momentum.

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Answer:

Explanation:

Formula

E = I * R                                      Substitute the givens into the formula

Givens

E = 120 volts

I = ?

R = 4800 0hms

Solution

Ohms law is a 3 letter equation that relates volts ohms (resistance) * current (in amperes)

E = i * R

120 V = I * 4800 ohms               Divide both sides by 4800  

120 V/4800 = I * 4800/4800     Divide

0.025 amps = I

Answer

I = 0.025 amps

Answer:

Quantum mechanics is the science of the very-small things. It explains the behavior of matter and its interactions with energy on the scale of atomic and subatomic particles. By contrast, classical physics explains matter and energy only on a scale familiar to human experience, including the behavior of astronomical bodies such as the Moon. Classical physics is still used in much of modern science and technology. However, towards the end of the 19th century, scientists discovered phenomena in both the large (macro) and the small (micro) worlds that classical physics could not explain. The desire to resolve inconsistencies between observed phenomena and classical theory led to two major revolutions in physics that created a shift in the original scientific paradigm: the theory of relativity and the development of quantum mechanics. This article describes how physicists discovered the limitations of classical physics and developed the main concepts of the quantum theory that replaced it in the early decades of the 20th century. It describes these concepts in roughly the order in which they were first discovered. For a more complete history of the subject, see History of quantum mechanics. Light behaves in some aspects like particles and in other aspects like waves. Matter—the "stuff" of the universe consisting of particles such as electrons and atoms—exhibits wavelike behavior too. Some light sources, such as neon lights, give off only certain specific frequencies of light, a small set of distinct pure colors determined by neon's atomic structure. Quantum mechanics shows that light, along with all other forms of electromagnetic radiation, comes in discrete units, called photons, and predicts its spectral energies (corresponding to pure colors), and the intensities of its light beams. A single photon is a quantum, or smallest observable particle, of the electromagnetic field. A partial photon is never experimentally observed. More broadly, quantum mechanics shows that many properties of objects, such as position, speed, and angular momentum, that appeared continuous in the zoomed-out view of classical mechanics, turn out to be (in the very tiny, zoomed-in scale of quantum mechanics) quantized. Such properties of elementary particles are required to take on one of a set of small, discrete allowable values, and since the gap between these values is also small, the discontinuities are only apparent at very tiny (atomic) scales. Many aspects of quantum mechanics are counterintuitive and can seem paradoxical because they describe behavior quite different from that seen at larger scales. In the words of quantum physicist Richard Feynman, quantum mechanics deals with "nature as She is—absurd".  For example, the uncertainty principle of quantum mechanics means that the more closely one pins down one measurement (such as the position of a particle), the less accurate another complementary measurement pertaining to the same particle (such as its speed) must become.  Another example is entanglement, in which a measurement of any two-valued state of a particle (such as light polarized up or down) made on either of two "entangled" particles that are very far apart causes a subsequent measurement on the other particle to always be the other of the two values (such as polarized in the opposite direction).  A final example is superfluidity, in which a container of liquid helium, cooled down to near absolute zero in temperature spontaneously flows (slowly) up and over the opening of its container, against the force of gravity.

Explanation:

hope this makes sense and helps :)

Answer:

Quantum mechanics is the science of the very-small things. It explains the behavior of matter and its interactions with energy on the scale of atomic and subatomic particles. By contrast, classical physics explains matter and energy only on a scale familiar to human experience, including the behavior of astronomical bodies such as the Moon. Classical physics is still used in much of modern science and technology. However, towards the end of the 19th century, scientists discovered phenomena in both the large (macro) and the small (micro) worlds that classical physics could not explain. The desire to resolve inconsistencies between observed phenomena and classical theory led to two major revolutions in physics that created a shift in the original scientific paradigm: the theory of relativity and the development of quantum mechanics. This article describes how physicists discovered the limitations of classical physics and developed the main concepts of the quantum theory that replaced it in the early decades of the 20th century. It describes these concepts in roughly the order in which they were first discovered. For a more complete history of the subject, see History of quantum mechanics. Light behaves in some aspects like particles and in other aspects like waves. Matter—the "stuff" of the universe consisting of particles such as electrons and atoms—exhibits wavelike behavior too. Some light sources, such as neon lights, give off only certain specific frequencies of light, a small set of distinct pure colors determined by neon's atomic structure. Quantum mechanics shows that light, along with all other forms of electromagnetic radiation, comes in discrete units, called photons, and predicts its spectral energies (corresponding to pure colors), and the intensities of its light beams. A single photon is a quantum, or smallest observable particle, of the electromagnetic field. A partial photon is never experimentally observed. More broadly, quantum mechanics shows that many properties of objects, such as position, speed, and angular momentum, that appeared continuous in the zoomed-out view of classical mechanics, turn out to be (in the very tiny, zoomed-in scale of quantum mechanics) quantized. Such properties of elementary particles are required to take on one of a set of small, discrete allowable values, and since the gap between these values is also small, the discontinuities are only apparent at very tiny (atomic) scales. Many aspects of quantum mechanics are counterintuitive and can seem paradoxical because they describe behavior quite different from that seen at larger scales. In the words of quantum physicist Richard Feynman, quantum mechanics deals with "nature as She is—absurd".  For example, the uncertainty principle of quantum mechanics means that the more closely one pins down one measurement (such as the position of a particle), the less accurate another complementary measurement pertaining to the same particle (such as its speed) must become.  Another example is entanglement, in which a measurement of any two-valued state of a particle (such as light polarized up or down) made on either of two "entangled" particles that are very far apart causes a subsequent measurement on the other particle to always be the other of the two values (such as polarized in the opposite direction).  A final example is superfluidity, in which a container of liquid helium, cooled down to near absolute zero in temperature spontaneously flows (slowly) up and over the opening of its container, against the force of gravity.

Explanation:

if you need anything gust let me know :)

Answer:

391.5 J

Explanation:

The amount of work done can be calculated using the formula:

Looking at the formula, we can see that the mass of the object does not affect the work done on it.

Substitute the force applied and the displacement of the object into the equation.

The amount of work done on the object is 391.5 J in order to move it 4.5 meters with an applied force of 87 Newtons.

Mass doesn't matter on amount of work done .We can calculate amount of work done through Force and Displacement

\(\boxed{\sf W=Fd}\)

\(\\ \sf\longmapsto Work\:Done=87(4.5)\)

\(\\ \sf\longmapsto Work\:done=391.5J\)

Two wires A and B made of the same metal and have equal lengths but the resistance of wire A is six times the resistance of wire B then the radius of wire B is \(\sqrt{6}\) times the radius of wire A.

The ratio of the resistance of two wires is given by;

\(\frac{R_A}{R_B}=\frac{\rho_A L/A_A}{\rho_B L/A_B}\)

Since both wires are made of the same metal, their resistivity is the same.

Hence,

\($\frac{R_A}{R_B}=\frac{A_B}{A_A}$\)

As we know that resistance is directly proportional to the length of the wire and inversely proportional to the square of its radius.

Therefore;

\($\frac{R_A}{R_B}=\frac{\pi r_B^2}{\pi r_A^2}$\)

\($\frac{r_A^2}{r_B^2}=\frac{1}{6}$\)

\($\frac{r_A}{r_B}=\sqrt{\frac{1}{6}}$\)

Hence, the ratio of the radii of wire A and wire B is \($\frac{1}{\sqrt{6}}$\).

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Answer:

Explanation:

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

where

a is the acceleration

v is the speed

t is the time

From the question we have

v = 10 × 25

We have the final answer as

Hope this helps you

Answer:

thermal energy

Explanation:

Answer:

Let R1= resistance of 4ohms

R2= resistance of 8ohms

Equivalent resistance R will be

R=R1 + R2

=> 4+8=12ohms

The current through the two resistors will be the same since they are connected in series. Notwithstanding, the voltage will drop to appreciate the change.

Explanation:

The value of current from the 8-ohm resistor is the same as in the 4-ohm resistor which is equal to the 2 Amp.

Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.

When two resistors are connected to the series in that condition the value of current is the same in both the resistors.

While the value of resistance is different in both the different.

Hence the value of current from the 8-ohm resistor is the same as in the 4-ohm resistor which is equal to the 2 Amp.

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Answer:

344.8 m/s

Explanation:

Looking for speed of sound  = meters / sec

       2 meters / .0058 seconds = 344.8 m/s

The velocity of the sound wave is 344.8 meter/second.

A sound is a vibration that travels as a mechanical wave across a medium. It can spread through a solid, a liquid, or a gas as the medium. Solids carry sound the quickest, liquids somewhat more slowly, and gases the least slowly.

According to physics, sound is described as a vibration that travels through a material like a gas, liquid, or solid as an audible wave of pressure.

Given parameters:

The microphones are held 2.0 m apart.

it took the sound 0.0058 seconds to travel from one microphone to the other.

Hence,  the velocity of the sound wave is = distance travelled/time taken

= 2.0 meter / 0.0058 second

= 344.8276 meter/second.

Hence, the velocity of the sound wave is 344.8 meter/second ( after rounding  answer to one decimal place.).

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The fitness equipment would you use if you were doing the Twist and Shout exercise is a medicine ball. The correct option is B.

A smaller segment of the larger sporting goods industry is fitness equipment. Treadmills, free weights, weight machines, and elliptical trainers are examples of fitness equipment. A treadmill is a machine with a moving belt on which a person can walk or run while standing still.

A medicinal ball enables you to conduct dynamic movements while adding weight and resistance.

Therefore, the correct option is B. Medicine ball.

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The formula of chromium oxide, which is formed when a chromium ion with a 3+ charge combines with an oxygen ion with a 2- charge be Cr₂O₃.

A chemical formula is a formula that indicates the number of atoms of one or more specific elements are present in a given chemical composition. The amount of each specific atom present in the chemical compound is indicated by the numbers that appear as subscripts on certain symbols inside the formula.

In the question, we have chemical compound named chromium oxide, which is formed when a chromium ion with a 3+ charge combines with an oxygen ion with a 2- charge. So, its chemical formula be Cr₂O₃.

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The macro scale look of the lake is determined by water molecules.

The macro scale refers to the broad scale motion of the gas, while the micro scale refers to individual molecule movements.

The macroscale is defined as geometry on the order of millimeters and beyond, whereas the microscale is concerned with length scales down to the micrometer range.

The biggest circulation patterns in the earth's lower atmosphere are represented by macroscale winds. These wind patterns can endure from days to months and span distances of hundreds to thousands of kilometers.

The jet stream and trade winds are two examples of planetary scale wind patterns.

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How can the change that the molecular scale affect the Lakes Macro scale appearance

The number of times the drops were repeated and the mass of the balloons may be controlled variables that are kept constant during the experiment to isolate the effect of the height of the window on the time it takes for the balloons to reach the ground.

What is Isolated System?

An isolated system is a concept in thermodynamics and physics that refers to a system that does not exchange energy or matter with its surroundings. It is a closed system with respect to both energy and matter, meaning that no energy or matter is transferred across its boundaries. In an isolated system, the total energy, including both kinetic and potential energy, remains constant over time. This is known as the principle of conservation of energy.

The experiment's variable in this case is the height of the window from which the balloons are dropped. The students are specifically testing the effect of gravity, which is influenced by the height from which an object falls. By varying the height of the window, the students are manipulating the independent variable (height of the window) to observe the effect on the dependent variable (time it takes for the balloons to reach the ground).

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