After soccer practice coach Miller goes to the roof of the school to retrieve the event soccer balls the height of the school is 3.5 m a soccer ball which leaves the roof with only a horizontal velocity of 15 m/s in the ignoring air resistance how far is the ball above the ground at 0.32 seconds

During the formation of the solar system, the solar nebula contracts, spins faster due to conservation of angular momentum and flattens out into the ecliptic plane. This process doesn't result in a black hole formation or loss of angular momentum.

In the formation of the solar system, the solar nebula contracts and, due to the conservation of angular momentum, it starts to spin faster. As it continues to contract, it begins to flatten out into what we call the ecliptic plane, an imaginary plane that passes through all the planets orbits.

This movement and transformation do not lead to the formation of a black hole or necessarily result in the loss of angular momentum. Rather, the nebula maintains its angular momentum, as per the law of conservation, and this aids in speeding up the rotation as the nebula gets smaller. This is very similar to what happens when a figure skater pulls their arms in while spinning, they go faster but their angular momentum remains constant.

These processes—gravity-induced contraction, increase in rotation speed, and flattening into the ecliptic plane—are integral steps in our understanding of how our solar system came into existence.

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During the formation of the solar system, the solar nebula contracts, flattens into the ecliptic plane and spins faster. This is due to the conservation of angular momentum. The material is concentrated in the center, forming a star, with the remaining materials eventually becoming planets and moons.

As the solar nebula contracts during the formation of the solar system, it flattens out into the ecliptic plane and spins faster due to conservation of angular momentum. This process starts when a large cloud of gas and dust, which originally had rotational energy, begins to contract under its own gravity. The natural motion and turbulence of the material lead to an initial spinning motion.

As the nebula shrinks, the rotation causes it to flatten into a disk-like shape. This can be compared to a figure skater spinning more rapidly by bringing her arms in closer to her body, which minimizes her rotational radius and conserves angular momentum. Similarly, as the nebula contracts and its rotational radius decreases, it spins faster.

A majority of the matter becomes concentrated in the hot center, eventually leading to the formation of a star. The remainder of the material, consisting of solid particles which condense as the nebula cools, forms the planetesimals - the building blocks of the planets and moons.

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Answer:

waist circumference

Explanation:

Answer:

the force required to accelerate a 1,100kg car is 550N

Answer:

The torque applied to the nut is 34.6 N-m.

Explanation:

Given that,

Length of the wrench, l = 0.5 m

Force applied by the wrench, F = 80 N

The force must be exerted upward and at an angle of 60.0 degrees, with respect to a line from the bolt through the end of the wrench.

Torque applied to the nut is given by :

[tex]\tau=Fr\ \sin\theta\\\tau=80\times 0.5\ \sin(60)\\\tau=34.6\ N.m[/tex]

So, the torque applied to the nut is 34.6 N-m.

Answer:

3688 km/h

Explanation:

Given:-

- The speed of vehicle relative to earth, vs_e = 3760 km/h

- The relative speed of command and motor, v_c/m = 90 km/h

- The mass of command = m

- The mass of motor = 4m

Find:-

What is the speed of the command module relative to Earth just after the separation?

Solution:-

- Consider the space vehicle as a system that detaches itself into two parts ( command and motor ). We will assume that the gravitational pull due to Earth on the space vehicle is negligible. With that assumption we have our system in isolation. We will apply the principle of conservation of linear momentum on the system as follows:

             Initial momentum = Final momentum

                                       Pi = Pf

                  M*vs_e = m*vc_e + 4m*vm_e

Where,

                  M = m + 4m = 5m

                  vc_e = Velocity of command relative to earth

                  vm_e = Velocity of motor relative to earth  

- We will develop a relation of velocities of command and motor in the frame of earth as follows:

                  vm_e =  v_c/m + vc_e        

- Substituting (vm_e) from Equation 2 into Equation 1, we have:

                  5m*vs_e = m*vc_e + 4m*(v_c/m + vc_e)

                  5m*vs_e = 5m*vc_e + 4m*(v_c/m)

- Solve for vc_e:

                  5m*vs_e -  4m*(v_c/m) = 5m*vc_e

                   vs_e - 0.8*(v_c/m) = vc_e

- Plug in values and evaluate vc_e:

                  vc_e = 3760 - 0.8*(90)

                  vc_e = 3,688 km/h

Answer:

The command module is traveling at 3832 km/h after the separation.

Explanation:

Let's call the mass of the module M, and the mass of the motor is 4M. The total mass of the vehicle, then, is M + 4M = 5M.

Now, momentum = force x distance.

Thus, momentum of the vehicle before separation 3760 x 5M = 18800M kg-km/h.

Let's call the velocity of the motor v. So the velocity of the module must be v + 93.

Now, after the separation, the momentum of the motor will be 4Mv, and the momentum of the module is M(v + 90) = Mv + 90M. The total momentum is 4MV + Mv + 90M = 5Mv + 90M.

From conservation of momentum that says initial momentum equals final momentum, we have;

18800M = 5Mv + 90M

Divide both sides by M to get;

18800 = 5v + 90

18800 - 90 = 5v

18710 = 5v

v = 18710/5

v = 3742 km/h

But v is the velocity of the motor, so we have to add 90 to get the velocity of the module, thus, velocity of module = 3742 + 90 = 3832

So the command module is traveling at 3832 km/h after the separation.

Answer:

Explanation:

We want to know the percentage of the radio active element after 7half life

Let assume the original mass or quantity of the radioactive element is No

After first half life it remains No/2

Second half life No/4

Third half life No/8

Fourth half life No/16

Fifth half life No/32

Sixth half life No/64

Seventh half life No/128

So after the seventh half life the radioactive element has decay to No/128

Then, the that remain is

The remaining amount / Original amount × 100

%remain = (No/128 / No) × 100

No cancel No

%remain = 100/128

%remain = 0.78%

The box will be pushed by Person A and so the box will move with magnitude of 10 N force and in left direction.

Explanation:

So in the present problem, three forces are acting on the box. The force exerted by Person A on the box is represented as F₁ and it is given as 10000 N. Similarly, the net force exerted by Person B and friction on the box is given as 9990 N and it is represented as F₂. Since, F₁ is acting toward left side and F₂ is acting toward right side, both the force will be acting opposite to each other. Then the net force of all the three force acting on it will be the difference between F₁ and F₂ and the box will move towards the direction of maximum force.

[tex]Net force = 10000-9990 = 10 N[/tex]

Thus, the magnitude of the net force acting on the box will be 10 N and as the force exerted by Person A on the box is greater than the combined force of Person B and friction, the box will move towards left side as exerted by Person A.

So the box will be pushed by Person A and so the box will move with magnitude of 10 N force and in left direction.

Answer:

Net filtration pressure

Explanation:

The net filtration pressure is the outward pressure minus the inward pressure. Figure of a glomerular capsule with glomerular hydrostatic pressure, blood colloid osmotic pressure, and capsular hydrostatic pressure.

The sum of all of the influences, both osmotic and hydrostatic, results in a net filtration pressure (NFP) of about 10 mm Hg. A proper concentration of solutes in the blood is important in maintaining osmotic pressure both in the glomerulus and systemically.

Answer:

Destructive interference

Explanation:

Destructive interference occurs when waves come together in such a way that they completely cancel each other out. When two waves interfere destructively, they must have the same amplitude in opposite directions.

Answer:

Destructive interference

Explanation:

Destructive interference occurs when waves come together in such a way that they completely cancel each other out. When two waves interfere destructively, they must have the same amplitude in opposite directions.

im also taking the quiz now

Answer:

In physical sciences, mechanical energy is the sum of potential energy and kinetic energy. It is the energy associated with the motion and position of an object.

Explanation:

Answer:

Mechanical Energy is Kinetic energy + the Potential Energy.

Explanation:

ME=KE+PE

Answer:

Can we please have the options for the drop down menu

Explanation:

Answer:

Before a tornado warning occurs, you should Have a disaster plan ready

If you’re indoors during a tornado, you should go to the basement

If you’re outdoors during a tornado, you should  lie in a ditch or low-lying ditch

A coefficient called the Avogadro's number is used to calculate the number of atoms in each molecule.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.

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Answer:

Because of unstable membrane potentials

Explanation:

Autorhythmic cells are specialized cardiac muscle cells in the heart from which electrical impulses called action potentials originate. These cells can generate electrical impulses without any external simulations by the nerve cells. I.e. they are self – excitable.

Autorhythmic cells spontaneously create action potentials because they have an unstable resting or membrane potentials that continuously depolarizes, drifting slowly toward threshold. As sodium ions enter the cell, the inner surface of the plasma membrane gradually becomes less negative, generating the pacemaker potential.

Though their is an influx of sodium ions into the cell, the basic reason for the spontaneous generation of action potentials solely because of unstable membrane potentials. and not majorly due to the influx of sodium ion.

Autorhythmic cells can generate action potentials spontaneously due to the presence of L-type Ca2+ channels.

Autorhythmic cells are a type of specialized cells found in the heart. Unlike regular cardiac muscle cells, autorhythmic cells can generate action potentials spontaneously without external stimuli. This is due to the presence of L-type Ca2+ channels.

These channels allow the entry of calcium ions, which triggers the depolarization phase of the action potential. The influx of calcium ions leads to the opening of voltage-gated potassium channels and closure of calcium channels, helping restore the resting membrane potential.

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the soccer player maintains contact with the ball for approximately 0.0121 seconds.

We can use the impulse-momentum theorem to solve this problem. The impulse-momentum theorem states that the change in momentum of an object is equal to the impulse applied to it. Impulse [tex](\( J \))[/tex] is the product of force[tex](\( F \)) and time (\( \Delta t \)).[/tex]

[tex]\[ J = F \times \Delta t \][/tex]

Given:

- Change in momentum[tex](\( \Delta p \))[/tex]= 11 kg·m/s

- Net force[tex](\( F \))[/tex] = 910 N

Using the formula for impulse, we can rearrange it to solve for time[tex](\( \Delta t \)):[/tex]

[tex]\[ \Delta t = \frac{\Delta p}{F} \][/tex]

Substitute the given values:

[tex]\[ \Delta t = \frac{11 \, \text{kg·m/s}}{910 \, \text{N}} \]\[ \Delta t = \frac{11}{910} \, \text{s} \]\[ \Delta t \approx 0.0121 \, \text{s} \][/tex]

Therefore, the soccer player maintains contact with the ball for approximately 0.0121 seconds.

Answer:

a) The speed is 61.42 m/s

b) The drag force is 10.32 N

Explanation:

a) The Reynold´s number for the model and prototype is:

[tex]Re_{m} =\frac{p_{m}V_{m}L_{m} }{u_{m} }[/tex]

[tex]Re_{p} =\frac{p_{p}V_{p}L_{p} }{u_{p} }[/tex]

Equaling both Reynold's number:

[tex]\frac{p_{p}V_{p}L_{p} }{u_{p} }=\frac{p_{m}V_{m}L_{m} }{u_{m} }[/tex]

Clearing Vm:

[tex]V_{m} =\frac{p_{p}V_{p}L_{p} u_{m} }{u_{p} p_{m} L_{m} }=\frac{999.1*0.56*8*1.849x10^{-5} }{1.138x10^{-3}*1.184*1 } =61.42m/s[/tex]

b) The drag force is:

[tex]\frac{F_{Dm} }{p_{m}V_{m}^{2}L_{m}^{2} } =\frac{F_{Dp} }{p_{p}V_{p}^{2}L_{p}^{2} } \\F_{Dp} =\frac{F_{Dp}p_{p}V_{p}^{2}L_{p}^{2} }{p_{m}V_{m}^{2}L_{m}^{2} } \\F_{Dp}=\frac{2.3*999.1*0.56^{2} *8^{2} }{1.184*61.42^{2}*1^{2} } =10.32N[/tex]

Answer:

1. The air speed at which wind tunnel should be ran in order to achieve similarity = 61.423 m/s

2. The drag force on the prototype submarine at the conditions given above = 10.325 N.

Explanation:

1. Here we have

Density of water at 15 °C = 999.1 kg/m³

Density of air at 25 °C = 1.184 kg/m³

[tex]\mu_{Water}[/tex] at 15 °C = 1.138 × 10⁻³ kg/(m·s)

[tex]\mu_{Air}[/tex] at 25 °C = 1.849 × 10⁻⁵ kg/(m·s)    

The formula is

[tex]\frac{V_m\times \rho_m \times L_m}{\mu_m} = \frac{V_p\times \rho_p \times L_p}{\mu_p}[/tex]

Where:

[tex]V_m[/tex] = Velocity of the model =

[tex]\rho_m[/tex] = Density of the model medium at the medium temperature = 1.184 kg/m³

[tex]L_m[/tex] = Length of the model = 1/8 × [tex]L_p[/tex] = 0.28 m

[tex]\mu_m[/tex] = Dynamic viscosity of model medium at the model medium temperature = 1.849 × 10⁻⁵ kg/(m·s)

[tex]V_p[/tex] = Velocity of the prototype = 0.560 m/s

[tex]\rho_p[/tex] = Density of the prototype medium at the medium temperature = 999.1 kg/m³

[tex]L_p[/tex] = Length of the prototype = 2.24 m

[tex]\mu_p[/tex] = Dynamic viscosity of prototype medium at the prototype medium temperature 1.138 × 10⁻³ kg/(m·s)

Therefore

[tex]{V_m}{} = \frac{V_p\times \rho_p \times L_p \times \mu_m}{\mu_p\times \rho_m \times L_m}[/tex]

[tex]{V_m}{} = \frac{0.560\times 999.1 \times 2.24 \times 1.849 \times 10^{-5}}{1.138 \times 10^{-3}\times 1.184 \times 0.28}[/tex] =  61.423 m/s

The air speed at which wind tunnel should be ran in order to achieve similarity = 61.423 m/s

2. The drag force on the prototype is given by    

[tex]F_{D.p} = F_{D.m}(\frac{\rho_p}{\rho_m} )( \frac{V_p}{V_m})^2 ( \frac{L_p}{L_m})^2\\[/tex]

Where:

[tex]F_{D.p}[/tex] = Drag force of the prototype

[tex]F_{D.m}[/tex] = Drag force of the model

[tex]F_{D.p} =2.3(\frac{999.1 }{1.184} )( \frac{0.560 }{61.423 })^2 ( \frac{2.24 }{0.28})^2\\[/tex] =   10.325 N

The drag force on the prototype submarine at the conditions given above = 10.325 N.

The minimum potential difference must be supplied by the ignition circuit to start a car is -1800 V

Explanation:

Given data,

E= 3 ×10 ⁶ Δx=0.06/100

We have to find the minimum potential difference

E= -ΔV/Δx

ΔV=- E × Δx

ΔV =-3 ×10 ⁶ . 0.06/100

ΔV=-1800 V

The minimum potential difference must be supplied by the ignition circuit to start a car is -1800 V

Answer:

I can confirm that is the answer

Explanation:

I did the question

Neither technician A nor B. No technician is correct.

Two spark plugs are connected to the ends of one coil in a waste spark ignition system (for a two-cylinder engine) ( for 4 cylinder engine two coils are used, each driving two spark plugs ).

As a result, both spark plugs will light up simultaneously. The first (A) cylinder's compression stroke will ignite one spark plug, while the opposing cylinder's exhaust stroke will fire the second ( wasted ). Cylinder "A" will fire during the exhaust stroke when it is time for cylinder "B" to fire during compression.

Due of the opposing current flow, both spark plugs burn simultaneously from the ends of just one coil. The spark "flows" in this manner from the center to the exterior.

Therefore, Neither technician A nor B. No technician is correct.

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Final answer:

Both Technician A and Technician B are correct; the waste spark ignition system fires two spark plugs at the same time and uses ignition coils connected to companion cylinders. So the correct option is c.

Explanation:

The subject of this question is the waste spark ignition system which is used in internal combustion engines. When evaluating the statements made by Technician A and Technician B, we find that Technician A says that a waste spark ignition system fires two spark plugs at the same time. This is correct as in a waste spark system, each ignition coil fires two plugs simultaneously - one on the compression stroke and the other on the exhaust stroke (which is the 'waste' spark). Technician B says that the system uses ignition coils connected to companion cylinders. This is also correct, as the coils are connected to two cylinders that are at the top dead center at the same time, one on the power stroke, and the other on the exhaust stroke.

Therefore, the answer is:

c. Both technicians A and B

Answer:

C. 441 N

Explanation:

Gravitational force between two objects can by calculated by the formula

= G m₁m₂ / r² , m₁ and m₂ are masses at distance r

= ( 6.67 x 10⁻¹¹ x 45 x 5.98 x 10²⁴) / ( 6.38 x 10⁶ )²

= 44.09 x 10

= 440.9 N

= 441 N .  

Answer:

See explanation

Explanation:

Acceleration is defined as the change in velocity. In other words, if your velocity changes, then you are accelerating. And since velocity is a vector of both speed and direction, you don't have to be speeding up to be accelerating, you could also just be turning. Hope this helps!

Acceleration is the change in velocity of an object, can involve speed or direction, and is measured as a vector quantity. It is notably expressed in physics by Newton's Second Law, F = ma, and experienced through everyday examples like using a car's accelerator.

In physics, acceleration is defined as the rate at which the velocity of an object changes over time. This can include changes in speed, direction, or both. It is a vector quantity, which means it has both magnitude and direction. Acceleration occurs when a force is applied to a mass, described by Newtons Second Law, with the equation F = ma, indicating that force (F) is the product of mass (m) and acceleration (a). The SI unit for measuring acceleration is meter per second squared (m/s²).

In casual conversation, to 'accelerate' often means simply to speed up. An example of this is using the accelerator pedal in a car, which increases the vehicle's speed. This effect of acceleration, the increase in velocity, conforms to the physical definition, though in a broader sense, acceleration encompasses any change in velocity, not just speeding up.

We usually experience acceleration in daily life through the steady increase in speed due to gravity when an object falls, known in physics as gravitational acceleration. However, acceleration in a technical sense involves any alteration in uniform motion, whether it's a change in speed or a change in direction.

Summary: Acceleration, a change in velocity, signifies a change in either the speed or the direction of an object, veering from its original motion path due to the application of an external force.

Answer:

The unknown frequency is either 438 Hz or 442 Hz.

Explanation:

The frequency of a beat heard when two sounds with frequencies f₁ and f₂, are played simultaneously, is simply the difference between two frequencies.

b = |f₁ - f₂|

b = 2 Hz

f₁ = 440 Hz

f₂ = ?

440 - f₂ = 2 or 440 - f₂ = -2

f₂ = 438 Hz or 442 Hz

The unknown frequency is either 438 Hz or 442 Hz.

Hope this Helps!!!

Answer:

south

Explanation:

Answer:

B.) Y,W,Z,X

Explanation:

Edge 2021

Assuming letters represent current strengths in descending order, the correct answer for the list ordered from most bright to least bright is option (b) YWZX.

The relationship between the brightness of a light bulb and the current that powers it is such that a brighter bulb corresponds to a greater current when other factors such as voltage and bulb type are held constant.

To order the currents from greatest to least based on brightness, we would start with the highest current and move to the lowest. Since the question does not provide specific current values for W, X, Y, and Z, the best we can do is rely on the principle that higher current leads to greater brightness.

Given this, and assuming that W > X > Y > Z or some similar relationship, the order from most bright to least bright would be from the letter associated with the highest current to the lowest.

So if 'Y' represents the largest current and 'W', 'Z', and 'X' follow in decreasing order, the correct answer would be: (b) YWZX

Answer:

Explanation:

Mechanical Advantage = Outputforce / inputForce

outputforce = 400 X 3 = 1200

Mechanical Advantage = 1200 / 100

MA = 12

Answer:

Solar radiation

Explanation:

Gases such as methane , ozone, and Carbon dioxide are known as the greenhouse gases. When the gases are heated up they usually build up in the greenhouse effect and after a while they enter the atmosphere as solar radiation.

It is important to note that the release of the gases is usually the first(initial) release of the gases into the atmosphere.

Answer:

infrared radiation within the sun's radiation.

Explanation:

The solar radiation that gets to earth contains about 3 electromagnetic waves which includes visible rays, infrared rays, ultraviolet rays. Infrared rays carries heat through space and is the part of the solar radiation that carries heat into the earth's atmosphere.

Answer:

the image is behind the mirror, so the image is virtual and upright.

Explanation:

Answer:

Their number should increase

Explanation:

The photoelectric effect is a phenomenon that causes the ejection of electrons from that metal as light shined onto a metal surface. Only certain frequencies of light can cause the ejection of electrons. However, if the frequency of the incident light is too low then no electrons were ejected even if the intensity of the light was very high. If the frequency of the light was higher then electrons were able to be ejected from the metal surface even if the intensity of the light was very low.

According to the accepted wave theory, light of any frequency will cause electrons to be emitted. Kinetic energy emitted by the electrons depends upon the intensity of light.

According to the accepted wave theory, number of electrons being ejected by the metal should increase

The correct option is Their number should increase. According to classical wave theory, an increase in light intensity should increase the number of ejected electrons in the photoelectric effect. However, experiments show that the kinetic energy depends on the light's frequency, not intensity.

The phenomenon being described here is known as the photoelectric effect, which is a key piece of evidence for the particle nature of light. The classical wave theory of light predicted that the kinetic energy of ejected electrons should increase with the intensity of the light.

However, experiments have shown that the kinetic energy of the ejected electrons depends on the frequency of the light, not its intensity, and no electrons are ejected below a certain threshold frequency, regardless of the light's intensity.

Given the choices in the question, none exactly match the expectations from classical wave theory. However, based on the wave theory, one might erroneously expect that as the intensity of light increased, the number of ejected electrons (if any) would increase, which is the closest option provided.

Answer: D

D. Sound waves carry energy parallel to the motion of the wave, while EM waves carry energy perpendicular to it.

Explanation:

Sound is a longitudinal wave in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of propagation of the wave

While electromagnetic wave are transverse wave. A moving wave whose oscillations are perpendicular to the direction of the wave or path of propagation. So the correct answer is D. Sound waves carry energy parallel to the motion of the wave, while EM waves carry energy perpendicular to it