The correct answer is transient airflows under the combined motion of a door and the force of buoyancy.
However, the combined airflow characteristics generated by door motion, ventilation airflow, and thermal impacts have not yet been thoroughly defined. Door motion has been acknowledged as playing a part in the confined conveyance between indoor and outdoor regions. This study employed dynamic CFD simulation to look at the transient airflow characteristics and amount of air exchange generated by door motions in a thermally stratified environment with displacement ventilation. The results show that at a door angle of 30°, there is a 40% air exchange even though only 15% of the overall door motion process is used during the initial phase. Two important contributing factors are the temperature difference between the air inside and outside, as well as the rotational speed of the door.
The thermal convective flow may have a considerable impact on the airflow pattern through the doorway when the door motion is slow enough and the temperature difference is greater than 3 °C. The amount of air exchange rises linearly with door motion speed when there is no difference in temperature between the internal and exterior spaces. When buoyant force and door motion are coupled, a modest door speed yields minimal air exchange. Only the air temperatures close to the door are impacted by door movement. In the displacement ventilated room, a single door open and close cycle does not considerably reduce the overall temperature stratification. The research findings may help to improve knowledge of the consequences of dynamic disturbances in thermally stratified environments as well as offer recommendations for decreasing door motion-induced pollutant movement.
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At a certain temperature, the phph of a neutral solution is 7.68. what is the value of kwkwk_w at that temperature?
Kw = 4.36×10^-16 is the value of kw at temperature when the ph of a neutral solution is 7.68.
The formula for Kw is:
Kw= [H]*[OH]
where [H] and [OH] are concentrations
We are given the pH so we can calculate the [H] concentration from the formula:
pH=-log[H]
[tex]P_{H} =-log_{10} [H^{+} (aq)][/tex]
[tex]-P_{H} =log_{10} [H^{+} (aq)][/tex]
[tex][H^{+} (aq)]=10^{-P_{H} }[/tex]
[tex][H^{+} (aq)]=10^{-7.68}[/tex]
[tex][H^{+}(aq) ]=[/tex]2.089×[tex]10^{-8}[/tex]mol [tex]dm^{-3}[/tex]
In neutral solution, [H] = [OH],
therefore: [OH]=2.089×10^-8M
Calculating Kw:
Kw = (2.089×10^-8M) *(2.089×10^-8M)
Kw = 4.36×10^-16
What is the pH of a neutral solution at 100 degrees Celsius, where equals?pH + pOH = 14.00 (at 25°C) for any neutral solution with pH=pOH=7. At 100°C, the kw for water is 4.991013. Determine the pKw of water at this temperature, as well as the pH and pOH of a neutral aqueous solution at 100°C. pH and pOH values should be reported to two decimal places.To learn more about value of kw refer to
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What do you observe when you hold your largest plastic shopping bag square between the light source and the wall
The thing i observe if I hold a largest plastic shopping bag square between the light source and the wall is that since the plastic is Translucent, it allow some measures of light to pass through it. When light hits the translucent materials, since it is big and little thicker, only some of the light went through them.
What happens to light when it travels through air and meets an opaque surface?As light travels through air as well as into a clear material (such as glass), it speed is altered, and light is said to be reflected and also refracted by the said glass
Note that Light can pass through some kind of materials, such as glass, water, plastic that is clear and transparent materials.
Therefore, The thing i observe if I hold a largest plastic shopping bag square between the light source and the wall is that since the plastic is Translucent, it allow some measures of light to pass through it. When light hits the translucent materials, since it is big and little thicker, only some of the light went through them.
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Two+rocket+ships+approach+a+space+station+at+80%+of+the+speed+of+light.+each+pilot+observes+the+other+ship+approaching+at+____+the+speed+of+light.
Two rocket ships approach a space station at 80% of the speed of light. Each pilot observes the other ship approaching at 98% the speed of light.
What is the "Fastest" Speed of Light?Light moves at a constant, finite speed of 186,000 miles per second. A traveler traveling at the speed of light would circumnavigate the globe 7.5 times in one second. In comparison, a traveler in a jet aircraft traveling at 500 mph would cross the continental United States once in 4 hours.The speed of light in a vacuum, denoted c, is a universal physical constant that is important in many fields of physics. The speed of light c equals 299,792,458 meters per second.The speed of light is shared by all forms of electromagnetic radiation, including visible light. Light and other electromagnetic waves appear to propagate instantly for many practical purposes, but their finite speed has noticeable effects over long distances and with very sensitive measurements. Starlight seen from Earth long ago left the stars, allowing humans to study the history of the universe by viewing distant objects.
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As a giant cloud of gas collapses due to gravity, you would expect its rate of rotation to.
Answer:
increase!!!
M V R describes the angular momentum of mass M
If R is decreased for a given mass M then the velocity must increase to account for the angular momentum being a constant (conserved).
Given that vector a b = c, and that lal lbl = lcl, how are vectors a and b oriented with respect to each other?
Vector a b = c, and that |al |b| = |cl, vectors a and b oriented with respect to each other because they are perpendicular to each other.
What is a vector?A vector is an object that has both magnitude and a direction. Geometrically, we can picture vector as a directed line segment, whose length is the magnitude of the vector and with an arrow indicating the direction. The direction of vector is from its tail to its head.
Two vectors are the same if they have same magnitude and direction. This means that if we take a vector and translate it to a new position (without rotating it), then vector we obtain at the end of this process is the same vector we had in beginning.
Two examples of vectors are those that represent the force and velocity. Both the force and velocity are in a particular direction. The magnitude of vector would indicate the strength of the force or the speed associated with the velocity.
We denote vectors using the boldface as in a or b. Especially when writing by hand where one cannot easily write in boldface, people will sometimes denote vectors using the arrows , or they use the other markings. We won't need to use the arrows here. We denote magnitude of the vector a by |a|. When we want to refer to a number and stress that it is not a vector, we can call number a scalar. We will denote scalars with the italics, as in a or b.
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an infinitely long charged rod has uniform charge density of λ, and passes through a cylinder (gray). the cylinder in case 2 has twice the radius and half the length compared to the cylinder in case 1.
To compare the magnitude of flux through the surface wherein the cylinder in 2 has twice the radius and half the length compared to the cylinder in case 1 and this comparison in magnitude is given as ϕ= 2ϕ.
How would you define charge density?The charge density can be defined as a measurement of the amount of electric charge that is present per unit of surface area, body volume, or field.
The amount of charge that is held in a specific field is determined by the charge density. It is absolutely possible to calculate charge density of an object in terms of length, area, or volume.
How can you determine a rod’s charge density?If q is taken as the charge and l is the distance that it travels, then q/l is the formula for the linear charge density, and the S.I. Coulombs per meter (cm1) is the unit used to measure linear charge density.
What is the unit of charge density?The general response is most conveniently expressed in terms of the linear charge density, which is equal to Q/L for a finite rod of length L and total charge Q.
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if you are driving 120 km/h along a straight road and you look to the side for 2.2 s , how far do you travel during this inattentive period?
During this inattentive period, the distance traveled is 73.33 when the speed is 120 km/h and the time taken is 2.2 s.
What connection exists between time, distance, and speed?Every moving object travels a particular distance over time. These two factors enable us to determine the speed. The frequency of displacement is the sole determinant of speed. The complete mobility of an object, regardless of direction, will be its distance. No matter where an object originates or finishes, distance measures how much ground it has travelled. A process, an action, or a condition's duration is the amount of time that can be measured or quantified. Speed is the rate at which an object travels along a path over time, whereas velocity is the speed and direction of an item's motion. In another sense, velocity is a vector, whereas speed is a scalar value. There is a formula that connects these three things. Speed can be thought of as a gauge for a body's rate of motion. The distance covered in a single unit of time is how it is defined.
Speed = Distance/ Time
We are given Average speed, = 120 km/h=(120 * 1000)/3600=33.33 m/s
Time, t=2.2s
Now speed = Distance/ Time
⇒ Distance = speed * time=33.33*2.2=73.33
Thus distance traveled is 73.33 m
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How many grams of baking soda are in a 25.5 kg bag?
at perigee, the moon is 364,000 km from earth. at apogee, it is 407,000 km away. how many times larger does the moon appear to us during perigee than at apogee? the linear diameter of the moon is 3,480 km.
The moon appears 1.1153 during perigee than at apogee.
What is perigee?Perigee is the point at which the moon is nearest to the Earth each month.
The points of apogee and perigee varies throughout the year.
Apogee is the point at which the moon is farthest to the Earth each month.
from the data given,
perigee= 364000km
Apogee= 407000km
diameter= 3480km
p/a = 406,000/364,000
= 1.1153.
Thus, the moon appears 1.1153 during perigee than at apogee.
In conclusion, it has been scientifically found that in periods of four years, lunar perigees and apogees fall on the same or nearly the same calendar dates.
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A space shuttle is flying north at 6,510 m/s. It
then begins accelerating at 28.4 m/s2 directly
northeast to properly align its path towards
orbit around the Earth. After 60.0 s, what is
the direction of its velocity?
The direction of velocity is 81.12°
Given that,
Initially the space shuttle is flying North at 6510 m / sNext 60 seconds, it accelerates at 28.4 m / s² directly North-East.Velocity of the North-East travel = [tex]a_{NE}[/tex] * [tex]t_{NE}[/tex] = 28.4 * 60 = 1704 m / sSplitting the North-East travel into its horizontal and vertical components,Horizontal component = 1704 cos° 45 = 1204.9 m / sVertical component = 1704 sin° 45 = 1204.9 m / sThe vertical components are the north travel and the the vertical component of North-East travel. Total vertical velocity = 6510 + 1204.9 = 7714.9 m / sTotal Horizontal velocity = 1204.9 m / sThe resultant velocity makes a right angled triangle with the magnitude of total vertical and horizontal velocity.Since it is a right angled triangle,
tan θ = Opposite side / Adjacent side
tan θ = Total vertical velocity/ Total horizontal velocity
tan θ = 7714.9 / 1204.9 = 6.4
θ = [tex]tan^{-1}[/tex] ( 6.4 )
θ = 81.12 °
Therefore, the direction of its velocity is 81.12° with respect to x - axis.
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the home owner report that sometimes the electric furnace trip the 240-v 60-a circuit breaker connected to it
The homeowner has reported that sometimes the electric furnace trips the 240-V, 60-A circuit breaker connected to it. Upon examination, it is found that the furnace contains three 5000-W heating elements designed to turn on in stages.
SolutionThe power rating of the circuit breaker = volt x current
= 240 x 60
= 14400 W
So, we have 3 units of 5000W each.
Explanation and RecommendationWhen the first unit is turned on, the consumption is 5000W and the circuit breaker does not trip. When two of the 5000W units are turned on, it adds up to a consumption of 10000W.
The circuit breaker is still intact. But when the 3rd 5000W unit is turned on, the consumption reached to 15,000W which is greater than the 14,400W mark, and thus the circuit breaker trips off.
So, switching on all three units at once can cause the circuit breaker to trip off.
So, the recommendation would be that at a particular time maximum of two units can be turned on.
Even such, the two units cannot be turned on in series or they won’t receive 240 V each.
Another recommendation would be to use a circuit breaker of a higher power rating, more than 15,000W so that there will be no tripping.
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motion observed from a particular frame of reference is
Answer:
one in which the motion of a particle not subject to forces is in a straight line at constant speed
Explanation:
I searched this on the internet
What kind of boundary is shown in the image below?
Convergent
Divergent
Collisional
Transform
Answer:
ambt kaon✌️jhrhriekeieieieiei
Explanation:
iwuejejwiowksj
Write a differential equation for the concentration of the chemical in the pond at time t. hint: the concentration is c = a/v = a(t)/106
The differential equation for the concentration of the chemical is given by dc/dt = (3/10⁶)(1 - 100c)
Suppose that a(t) is the amount of chemical in the pond at time t.
So, a'(t) = rate of chemical inflow - the rate of chemical outflow.
So, da/dt = (0.01)300 - (a/10⁶)300
So, da/dt = 3 - 3a/10⁴
Now,
Since, c = a/v
Then, c' = a'/v
So, c' = (3 - 3a/10⁴)/10⁶
Or, c' = 3 (1 - a/10⁴)/10⁶
So, dc/dt = 3/10⁶ (1 - cv/10⁴)
So, dc/dt = (3/10⁶) (1 - 100c)
Therefore the differential equation for the concentration of the chemical is dc/dt = (3/10⁶)(1 - 100c)
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3.if kiis 44 nm for (-)d9-thc and 4350 nm for cbd what is the binding free energy difference, in kj/mol?
The correct answer is 0.00981 kJ/mol.
Every object we encounter has a binding force, and the energy that holds them together is the binding energy. The binding energy is the least amount of energy necessary to remove an electron, proton, or neutron from the nucleus. A nucleus contains electrons and protons that are strongly bound by energy.
Free energy of binding can be calculated using formula, Gbinding = dE coluombic + dEvdw + dGhyd. -TdS where Evdw+Ecoulombic is protein ligand interaction, dGhyd is change in hydration energy.
dS is entropy. dG hydration is Gpolar+Gnon polar. Inhibition constants are given for CBD and
THC = 4350nm, and 44nM. So,
dG = Ki + Ki' = 44+4350 = 4394 and
in kJ/mol = NahC/4394 = (6.022x10^23x6.626x10^-34x3x10^8)/4394 = 0.00981 kJ/mol
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What happens to the width of the central maximum if the wavelength is increased?
The width of central maximum increases if the wavelength is increased.
What is the width of the central maximum?The width of the central maximum is simply the distance between 1st order minima from the center of the screen on both sides. Thus, the central maximum becomes twice as wide if the slit width a becomes half as wide.
How is central maxima affected?For one slit experiment, the size(angular width) of the central maximum is given by a 2 λ a , where a is that the slit width. therefore the width of the central maximum is directly proportional to the wavelength of light and inversely proportional to slit width.
What is central maximum of a wave?A central maximum is that the brightest central zone of a diffraction pattern on the screen. The central maximum has the utmost intensity and widest of all the other diffraction fringes
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If a person practicing yoga for one hour burns 285 kilocalories (kcal), how many joules (j) of energy have they burned?
The person that practicing yoga for one hour burns 285 kilocalories (kcal) burned: 1192440 j of energy
To solve this problem the we have to do the conversion of units with the given information.
Information about the problem:
energy =285 kilocalories (kcal)energy expressed in joules (j) = ?1 kilocalorie (kcal)= 4184 joules (j)By converting the energy units from kilocalories (kcal) to joules (j) we have:
energy =285 kcal * 4184 j/ 1 kcal
energy = 1192440 j
What is unit conversion?It is the transformation of a value expressed in one unit of measurement into an equivalent value expressed in another unit of measurement of the same nature.
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If the connection to the resistor is completed at time tt = 0, what is the value of tt when the current has the value specified in part a?
Finding the initial and final values for the quantity that the capacitor or inductor opposes changing—i.e., the quantity that the reactive component is seeking to maintain constant—is the first stage.
This amount is voltage for capacitors and current for inductors. This amount is to be used as the "beginning" value because when the switch in a circuit is closed (or opened), the reactive component will try to keep that quantity at the same level as it was before the switch transition. This quantity's ultimate value is whatever it will be after an infinitely long period of time.
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2)
2H₂O → 2H₂ + O₂
Describe the mass of the reactants and products given the balanced chemical reaction.
Reactants are substances that are present at the beginning of a chemical reaction.
Products are the substance(s) to the right of the arrow. A substance that remains after a chemical reaction is complete is known as a product.
Consider the balanced chemical equation:
2H₂O → 2H₂ + O₂
Hydrogen and oxygen are the reactants, and water is the product in the balanced equation.
The reactants and product symbols and formulae are known from the aforementioned equation.
One oxygen molecule and two hydrogen atoms unite to form two water molecules.
The ratio of reactant to product is 2 : 1 : 2.
The total mass of products is equal to the total mass of the reactants according to the law of conservation of mass.
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explain the importance of body temperature regulation
Answer:
is an early warning sign of infection
Explanation:
it allows organs and bodily proccess to work effectively
Find the lengths of the sides of the triangle pqr. is it a right triangle? is it an isosceles triangle?
NO, It is an Right Triangle
p(2 , - 1 0) Q ( 4, 1, 1) R( 4, -5, 4)
PQ2 = ( 2 -4)^2 + (-1-1)^2 +( 0-1)^2
PQ^2= (4 + 4 +1 )=9
PQ = 3
QR^2 = ( 4 - 4)^2 + ( 1 +5)^2 + ( 1-4 )^2
= 0 + 36 + 9 =45
QR = √45 =3√5
RP^2 = ( 4-2)^2 + ( -5 +1)^2 + (4-0)^2
= 4 + 16 + 16 = 36
RP = 6
LENGTH OF SIDES ARE 3 ,6 , 3√5
and ajsoPQ^2 + RP^2 = 9 + 36 = 45 =QR^2
PQR is a right angle triangle
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I already did the first slide but it ahs to do with the second one. Please answer in complete sentences
Answer:
huhu
chuba bi miayang yo
trip rp rrip trip
Explanation:
how are things going with your family in the car with the family in because or am we supposed for a car to stay at the airport and get a taxi
1. If a rock is dropped from a height and hits the ground in just 1 second, the speed at impact is 10 m/s. What would
happen to the speed if it is dropped from a higher height?
a. Its final speed would remain the same because its rate of acceleration would remain the same.
b. Its final speed would increase because the acceleration due to gravity remains the same.
c. Its final speed would remain the same because its rate of acceleration would decrease.
d. Its final speed would increase because the acceleration due to gravity would decrease.
light travels through space at a speed of 3.0 × 108 m/s. a space probe is traveling away from earth at 2.5 × 108 m/s when one of its spotlights is turned on. what speed would an observer on earth measure for the light from the spotlight
The speed of light in a vacuum is the same for all frames of reference.
so "Light travels through space at a speed of 3.0 x 10^8 m/s."
frame of reference is a fixed background surrounding an object, assumed to be at rest and in a fixed positionThe usual frame of reference for the motion of most ordinary objects is the surface of earthn Newtonian physics, all motion must be defined in terms of a reference frame Relative Motionspeed of light is constant in all frame of refrencespeed of light does not change even while change the medium of propagation, be it either denser to lighter or lighter to denserTo know more about frame of reference visit : https://brainly.com/question/1217098
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F a = 2.0 cm, b = 3.0 cm, and i = 43 a, what is the magnitude of the magnetic field at point p?
The net magnetic force is 31.4×[tex]10^{-5}[/tex] T.
What is magnetic force?Data;
a = 1.0cm
b = 3.0cm
i = 30a
B = ?
The magnetic field at point 2 will be
[tex]B_{2}[/tex] = (μI/4[tex]\pi[/tex][tex]R^{2}[/tex]) ×Ф
[tex]B_{2}[/tex] = [tex]47.1[/tex]×[tex]10^{-5}[/tex] T
The magnetic field due at point 4 will be
[tex]B_{4}[/tex] = (μI/4[tex]\pi[/tex][tex]R^{2}[/tex]) ×Ф
[tex]B_{4}[/tex] = [tex]15.7[/tex]×[tex]10^{-5}[/tex] T
The direction of magnetic field due to 2 and 4 are in the opposite direction.
The Net magnetic force is
B = [tex]47.1[/tex]×[tex]10^{-5}[/tex] - [tex]15.7[/tex]×[tex]10^{-5}[/tex]
B = 31.4×[tex]10^{-5}[/tex] T
One of the four fundamental forces of nature, the electromagnetic force, results in the magnetic force, which is brought about by the motion of charges. When two charge-containing objects move in the same direction, a magnetic attraction pulls them together.
A magnetic field, a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. When a charge moves through a magnetic field, a force that is perpendicular to both its own velocity and the magnetic field operates on it. A permanent magnet's magnetic field pulls on ferromagnetic materials like iron and draws or repels other magnets.
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An electrical device is listed as 3,000 watts. approximately how many horsepower is this?
By unit conversion, the power is 4.023 HP.
We need to know about unit conversion to solve this problem. The unit conversion can be used to convert a unit to another unit. It can be defined as
a = xb
where a is unit a, b is unit b and x is the constant of conversion.
From the question above, we know that
P = 3000 watts
unit conversion
(1 HP = 745.7 watts)
Convert the unit conversion
1 HP = 745.7 watts
divide by 745.7
1/745.7 HP = 1 watts
Convert the aspirin power to horsepower
P = 3000 watts
P = 3000 x 1/745.7 HP
P = 3000/745.7 HP
P = 4.023 HP
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Using your model create the following scenarious first quarter moon
The first quarter in which half the Moon appears illuminated, occurs when the Moon is at a right angle with respect to the Sun when viewed from the Earth.
How do moon's different illumination occur?The Moon is a non illuminating celestial object and doesn't have its own light but reflects the light of the sun and with change in angle between moon and Sun the different phases of the moon appear as seen from earth.
Given:
The Moon is in the first quarter of illumination.
In the first quarter of the moon the only one-fourth of the sun is illuminated and is observable from earth.
For this to happen only the visibly i.e. one-fourth of the moon should be reflecting back the light of the sun.
For this to happen the moon shouldn't be completely opposite to the sun behind the earth. But rather at right angles with respect to the sun when seen from earth.
Therefore, The first quarter in which half the Moon appears illuminated, occurs when the Moon is at a right angle with respect to the Sun when viewed from the Earth.
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A ball is launched at some angle from horizontal toward a target some distance away on the ground. Neglect any effects due to air resistance. Where would the speed of the ball be the slowest?.
Answer:
at the vertical change
Explanation:
i believe this is right
A boat travels 6 m/s across a river. The current pushes downstream at 8 m/s. If the river is 104 m wide, then:
The speed of a bullet train is measured to be 312.0 mph ± 3.9 mph. What is the percent uncertainty in this measurement?
Answer: 1.3%
The speed of a bullet train is measured to be 312.0 mph ± 3.9 mph. What is the percent uncertainty in this measurement?(1 point) 1.3%