The apparent visual magnitude difference between the Star A is higher.
What does apparent visual magnitude measure?A star's apparent magnitude, or m, indicates how brilliant the star appears when it is far away from Earth. The scale is logarithmic and "backwards." Stars with larger magnitudes are also fainter stars. Be aware that brightness is another word for the flux of light that is coming at us and is measured in Watts per square meter.
The brightness of a star or other celestial object as seen from Earth is expressed in terms of apparent magnitude. The apparent magnitude of an object is determined by its inherent luminosity, its distance from Earth, and any light extinction brought on by interstellar dust in the path of the observer's line of sight.
The brightness of a star or other celestial object perceived from Earth is measured in apparent magnitude (m). The apparent magnitude of an object is determined by its inherent luminosity, its distance from Earth, and any light extinction brought on by interstellar dust in the path of the observer's line of sight.
The apparent visual magnitude difference between the Star A is higher.
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Drag the positive or negative feedback loop on the left to each process on the right. terms may be used once, more than once, or not at all.
The order of the positive and negative feedback loops are positive, positive, negative, positive, positive, negative.
What is a feedback loop?A system component known as a feedback loop is one in which all or a portion of the output is used as input for subsequent actions. A minimum of four phases comprise each feedback loop. Input is produced in the initial phase. Input is recorded and stored in the subsequent stage. Input is examined in the third stage, and during the fourth, decisions are made using the knowledge from the examination.
Both negative and positive feedback loops are possible. Insofar as they stay within predetermined bounds, negative feedback loops are self-regulating and helpful for sustaining an ideal condition. One of the most well-known examples of a self-regulating negative feedback loop is an old-fashioned home thermostat that turns on or off a furnace using bang-bang control.
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Find the electron and hole concentrations and fermi level in silicon at 300 k for boron
To find the electron and hole concentrations and fermi levels in silicon at 300 k for boron, fermi level is 9.3 x [tex]10^4 cm^-3[/tex].
Calculation and ExplanationIonization energy for boron in Si, 0.045 eV
Fermi level in silicon,
300 K at [tex]10^{15} cm^{-3}[/tex] (Boron atoms)
All boron impurities are ionized, 300K
Electron, hole concentrations and Fermi levels is found out,
The value of Na = [tex]10^{15} cm^{-3}[/tex]
np = [tex]\frac{ni^2}{nA}[/tex]
np = [tex]\frac{(9.65 x 10^9)^2}{10^15}[/tex]
np= 9.3 x [tex]10^4 cm^-3[/tex]
Fermi level is calculated,
Ef - Ev = kT ln(NV/ND)
value of kT = 0.0259 eV (300° K)
So, substitution the values
Ef - Ev = kT ln(NV/ND)
Ef - Ev = 0.0259ln (2.66 x [tex]10^{19} / 10^{15}[/tex] )
Ef - Ev = 0.0259ln (26600)
Ef - Ev = 0.0259 x 10.18
Ef - Ev = 0.263 eV
What is ionization energy?
Ionization energy, also known as ionization energy (IE) or ionization energy (British English spelling), is the minimal amount of energy needed to free the most loosely bonded electron from an isolated gaseous atom, positive ion, or molecule in physics and chemistry.
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Astronomers have not yet been able to detect planets outside our solar system. true false
Driving at a speed so fast that a driver cannot stop within the distance he/she can see with the use of headlights is called:________
Driving at a speed so fast that a driver cannot stop within the distance he/she can see with the use of headlights is called ___Overdriving headlights____
What is Overdriving headlights ?When a driver's sight is compromised by fog or darkness yet they continue to drive at a pace that prevents them from being able to stop in time to avoid objects in the road, it is sometimes referred to as "overdriving your headlights."
The best option when driving in rain, snow, or fog is to use your low beam headlights. Your high beams will just reflect back off the fog when it's foggy, making it even harder to see in front of you. Ideal conditions, such a clear day on dry roads, are where speed limits are posted.Using your headlights too much means. You cannot halt in the glow of your headlights in the distance. Drivers should proceed with caution if an approaching car's lights blind them. Examine the right.Learn more about Overdriving headlight here:
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What is the value of gravitational constant G
What could you do to increase the electric force between two charged
particles by a factor of 16?
O A. Reduce one particle's charge by a factor of 16.
о B. Increase one particle's charge by a factor of 4.
O
C. Reduce one particle's charge by a factor of 4.
OD. Increase one particle's charge by a factor of 16.
To increase the electric force between two charged particles by a factor of 16, we D. Increase one particle's charge by a factor of 16.
What is electric force?Electric force is the force of attraction between two charged particles.
The magnitude of the electric force is given by F = kq₁q₂/r² where
k = electrostatic constant, q₁ = charge on particle one, q₂ = charge on particle two and r = distance of separation between the two charges.Given that we have two charged particles q₁ and q₂ separated by a distance r, the electric force betwen them is given by F = kq₁q₂/r²
Now, if we want to increase the force by a factor 16, we have the new force F' = 16F
F' = 16kq₁q₂/r²
F' = k16q₁q₂/r²
F = k(16q₁)q₂/r² or kq₁(16q₂)/r²
This implies that either one of the charged particles q₁ or q₂ is increased by a factor of 16
So, to increase the electric force between two charged particles by a factor of 16, we D. Increase one particle's charge by a factor of 16.
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An ideal gas constant volume gas thermometer has pressure 2.00 atm at the triple point of water. what is the temperature when the pressure in the thermometer is 6.00 atm? group of answer choices
The temperature when the pressure in the thermometer is 6.00 atm is T2= 30.933 K
As specified by the IUPAC since 1982, one mole of an ideal gas has a volume of 22.710947(13) litres at standard conditions of temperature and pressure (273.15 K and precisely 105 Pa).
continuous volume,
Constant = PT
P equals pressure.
temperature, or T
Then
TTtri=PPtri
PPtriTtr = 273.16 SoT
Water's triple point temperature is i.
We have provided
P =0.0630 atm
T =348 K
T = 273.16 is the triple point value.
P/Ptri
Ptri = 273.16 then.
PT= 273.16 × 0.0630/348
Ptri = 0.0494 atm.
P =0.00560 atm
Ideal gas is present here at constant volume.
Thus, PT = Constant
P2T2=P1T1
T2 = P2
T1P1=0.00560×348
=0.0630
T2= 30.933 K
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If the maximum energy given to an electron during compton scattering is 30 kev, what is the wavelength of the incident photon?
Required wavelength is λ = 0.0119 nm
The Compton effect in physics is defined as the phenomenon that arises when a specific beam is dispersed on a specific particle with an increase in wavelength.
Equation :Given;
The campton scattering is k = 30 kev
The speed of light is c = 2.9979 X 10 ⁸ m/s
The planck's constant is h = 6.626 X 10⁻³⁴
The expression from Campton shift is given by,
λ' - λ = λc (1 - Cos∅)
Here, ∅ is the angle of scattering whose value is 180° for maximum energy transfer and λc is the campton wavelength whose value is
λc = h/mc
substitute the values in the above expression
λ' - λ = λc (1 - Cos 180°)
λ' - λ = 2 (h/mc)
Here, m is the mass of electron
On rearing the above expression
λ' = λ + 2 (h/mc)
The expression from conservation of energy is given by,
E - E' = k
(hc/λ) - (hc/λ') = k
hc((λ' - λ)/λλ') = k
hc ((λ' - λ)/k) = λλ'
Here E and E' are the initial and final energy of electron
substitute the values in the above equation
hc (2(h/mc)/k)) = λ (λ + 2 (h/mc))
λ² + (2h/mc)λ - 2h²/mk = 0
λ² + [tex]\frac{2(6.626X10^{-34}Js)}{(9.11X10^{-31}kg) (2.997X10^{8}m/s ) }[/tex] λ - [tex]\frac{2(6.626X10^{-34}Js)}{(9.11X10^{-31}kg) (30X10^{3}evX\frac{1.6X10^{-19} }{1ev} J) }[/tex] = 0
λ² + (4.85X10⁻¹²)λ - (2X10⁻²²) = 0
On solving the above expression
λ = 1.19 X 10⁻¹¹ m
λ = (1.19 X 10⁻¹¹ m X 10⁹ nm/1m)
λ = 0.0119 m
Thus, required wavelength is λ = 0.0119 nm
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He average speed of a horse that gallops a distance of 10 km in a time of 30 min is :_______
a. 10 km/h.
b. 20km/h.
c. 30km/h.
The average speed of a horse that gallops a distance of 10 km in a time of 30 min is: b. 20km/h.
The formula and procedure we will use to solve this problem is:
v = x/t
Where:
x = distancet = timev = velocityInformation about the problem:
x= 10 kmt = 30 minv =?By converting the time units from (min) to (h) we have:
t = 30 min * 1 h/60 min
t= 0.5 h
Applying the velocity formula we get:
v = x/t
v = 10 km/0.5 h
v = 20 km/h
What is velocity?It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).
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Ph=4.390 write the henderson-hasselbalch equation for a propanoic acid solution (ch3ch2co2h, pka=4.874). 4.390
Answer:
a) [A⁻]/[HA] = 0.227b) [A⁻]/[HA] = 0.991c) [A⁻]/[HA] = 2.667Explanation:In the Henderson-Hasselbalch equation, HA stands from an acid an A⁻ stands from its conjugate base, as follows:CH₃CH₂CO₂H = HACH₃CH₂CO₂⁻ = A⁻pH = pka + Log [A⁻]/[HA]pH = 4.874 + Log[CH₃CH₂CO₂⁻]/[CH₃CH₂CO₂H](a) 4.23 = 4.874 + Log [A⁻]/[HA]-0.644 = Log [A⁻]/[HA] = [A⁻]/[HA]0.227 = [A⁻]/[HA](b) 4.87 = 4.874 + Log [A⁻]/[HA]-0.004 = Log [A⁻]/[HA] = [A⁻]/[HA]0.991 = [A⁻]/[HA](c) 5.30 = 4.874 + Log [A⁻]/[HA]0.426 = Log [A⁻]/[HA] = [A⁻]/[HA]2.667 = [A⁻]/[HA]
Explanation:
How did planck find the correct curve for the specturm of light emitted by a hot obkect?
Planck find the correct curve for the specturm of light emitted by a hot object by vibrational energies of the atomic resonators were quantized.
Briefing :The energy density of a black body between λ and λ + dλ is the energy E=hc/λ of a mode times the density of states for photons, times the probability that the mode is occupied. This is Planck's renowned equation for a black body's energy density. According to this, electromagnetic radiation from heated bodies emits in discrete energy units or quanta, the size of which depends on a fundamental physical constant (Planck's constant). The basis of infrared imaging is the correlation between spectral emissivity, temperature, and radiant energy, which is made possible by Planck's equation.Learn more about the Planck's constant with the help of the given link:
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If your engine is flooded with gasoline, you should push the ____ to the floor and hold for _____.
a. accelerator, 5 seconds
b. accelerator, 1 minute
c. brake, 1 minute
d. brake, 5 seconds
If your engine is flooded with gasoline, you should push the brake, to the floor and hold for 5 seconds.
What is gasoline?Gasoline or petrol is a transparent, petroleum-derived flammable liquid that is used primarily as a fuel in most spark-ignited internal combustion engines. Gasoline is already considered frozen if it turns into a thick sludge or wax. To totally avoid frozen gasoline inside the car, focus on preventing the fuel line from freezing during winter. Stale gasoline can be dangerous as it contains a combination of over 150 chemicals that can destroy both animal and human lives. Gasoline vapors are heavier than air, so they settle on the ground and travel like a liquid. Because of this, they often find their way into drains, basements, and sewer lines.
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The bar on the histogram with endpoints 60 to 120 has a height of 0.14. what does this mean?
The correct answer he bar on the histogram with endpoints 60 to 120 has a height of 0.14 means 14% of the items were lost.
A histogram is a graph that uses rectangles to show the frequency of numerical data. The height of a rectangle (the vertical axis) represents the distribution frequency of a variable (the amount, or how frequently that variable appears).
The histogram is a popular graphing tool that is used to summarize discrete or continuous data that is measured on an interval scale. It is often used to illustrate the major features of the distribution of the data in a convenient form.
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Find the work done when a constant force f = 19 lbs moves a chair from x = 1.9 to x = 4.6 ft. along the x -axis.
The work done is 51.3 lb ft.
Stepsf = 19 lbs
moves a chair from x = 1.9 to x = 4.6 ft
W = [tex]\int\limits^b_aF {x} \, dx[/tex]
W = 51.3 lb ft
The work done is 51.3 lb ft.
Every time a force pushes something over a distance, work is done.
By multiplying the force by the distance moved in the force's direction, you may determine the energy transferred, or work done.
Energy transmitted equals work done, which is force times the distance travelled in the force's direction.
What is the method of work?The work W is equal to the force f times the distance d, or W = fd, to mathematically describe this idea. The work is W = fd cos if the force is applied at an angle of to the displacement.learn more about work done here
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The density of a 4.0 cm3 sample of a metal is 11.3 g/cm3. what is the density of 8.0 cm3 sample of the same metal?
The density of 8.0 cm³ sample of the same metal is 5.65g/cm³.
The density of a sample or a body is defined as, the density of a body is the amount of mass per unit volume . It is denoted by ρ. & its unit is kg/m³.
Density ρ = M/V
where, M is mass and V is volume of the body.
Solution,
Given here,
The density ρ₁ of volume V₁ & the density ρ₂ of volume V₂ of same metal therefore,
ρ₁ = 11.3 g/cm³
V₁ = 4.0 cm³
V₂ =8.0 cm³
ρ₂ =?
ρ₁ × v₁ = ρ₂ × v₂
ρ₂ = ρ₁ × v₁ /v₂
ρ₂ = (11.3 g/cm³× 4.0 cm³)/8.0 cm³
ρ₂ = 5.65 g/cm³
The density of sample of the same metal is 5.65 g/cm³
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The last quarter phase of the moon? rises at sunrise. rises at sunset. sets at sunset. crosses the meridian at sunrise. sets at sunrise.
The correct answer for the The last quarter phase of the moon is it crosses the meridian at sunrise .
A third quarter moon, or last quarter moon, rises around midnight and sets around noon. The Moon is nearly back to the point in its orbit where its dayside faces the Sun directly, and all we see from our vantage point is a thin curve.
The Last or Third Quarter is when we can see half of the Moon's illuminated portion and half of its shadow portion. This is why this phase is commonly referred to as Half Moon. We can only see half of the Moon because it is at a 90-degree angle to the Earth and Sun.
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If the cart's speed is 0.5 m/s and the puck's speed is 0.45 m/s, what are the two relative velocities?
0.05 m/s and -0.05 m/s
0.95 m/s and -0.95 m/s
0.95 m/s and -0.05 m/s
0.05 m/s and 0.95 m/s
The cart's speed is 0.5 m/s and the puck's speed is 0.45 m/s is 0.05 and .95m/s
Given:
A=The cart's speed is 0.5 m/s
B=The puck's speed is 0.45 m/s
Relative velocity formula =
[tex]V_{AB}=V_{A}-V_{B}[/tex]
[tex]V_{AB}=.5-.45=.05\\[/tex]
[tex]V_{BA}=V_{B}-V_{A}[/tex]
=.5+.45=0.95
The velocity of an object in respect to another object is defined as relative velocity. It is a measure of how rapidly two items move in relation to each other. In physics, relative velocity is significant because it explains how objects move and interact with one another. Many different sorts of interactions can have their relative velocity quantified. The velocity of an object in respect to another object is defined as relative velocity. It is a measure of how rapidly two items move in relation to each other. In physics, relative velocity is significant because it explains how objects move and interact with one another.
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TRUE or FALSE
Organs are composed of multiple tissue types.
Answer:
TRUE
Explanation:
Organs are made of two or more tissue types to allow them to function.
Hope this helps! :D
If 21,847 • 10^18 electrons pass through a wire in 12 s, find the current
Answer:
I = Q / t = N e / t
I = 21,847E18 * 1.60E-19 Coul / 12 sec = 2.18E22 * 1.60E-19 / 12 sec
I = 2.18 * 1.60 * 10^3 / 12 amps = 291 amps
_____ heat transfer occurs due to rapid collisions of atoms in a solid.
Convection
Radiation
Solar
Conduction
Baking soda and vinegar are mixed in a balloon. a gas is produced and the balloon expands to a volume of 1.50 l. what is the volume of the balloon in cm3? (1 l = 1 dm3; 1 dm = 10 cm)
The volume of the balloon is 1.5 x [tex]10^{3}[/tex] [tex]cm^{3}[/tex]
CalculationVolume that the balloon has expanded to = V = 1.50L
We know that 1 L = 1000 [tex]cm^{3}[/tex]
⇒ V = 1.50 x 1000 [tex]cm^{3}[/tex]
= 1500 [tex]cm^{3}[/tex] or 1.5 x [tex]10^{3}[/tex] [tex]cm^{3}[/tex]
Explanation of the reactionThere is an acid-base reaction when vinegar and baking soda are together. Baking soda is the basic, and vinegar is the acid. A gas called carbon dioxide bubbles and foams as a result of this reaction between the two.
Since the gas has nowhere else to go, it expands the balloon, causing it to self-inflate.
Use more vinegar and baking soda to make more carbon dioxide gas, which will result in a larger balloon.
The number of reactants utilized impacts the number of products produced, which is a key principle in chemical processes. The reaction ought to be largely finished once the pressure starts to drop.
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An electron travels at a speed of 28700 km/s parallel to an electric field of magnitude 12000 n/c. what distance will the electron travel before coming to a stop?
Answer:
The distance the electron travelled before coming to a stop is 195.19 x 10-13m
Explanation:
Flux in an electric field is given by;
Fe = qE
E= 12000 n/c.
q= 1.602x10-19 (charge of an electron)
Fe = 1.602x10-19c x 12000 n/c.
Fe= 1.92x10-17 N
Since F=ma
M = mass of an electron = 9.11x 10-31
a=?
1.92x10-17 N = 9.11x 10-31 x a
a = 1.92x10-17 N/9.11x 10-31
a = 2.11 x 1013
Given
V2= u2 +2as
Since v= 0 (final velocity is zero)
- u2 = 2as
(28.7)2 = -2 x (2.11 x 1013) x s
823.69 = -4.22 x 1013xs
S = 823.69/ -4.22 x 1013
S = 195.19 x 10-13m
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You accidentally drop an eraser out of the window of an apartment 15 m above the groun
e. How long will it take for the Eraser to reach the ground?
Answer:
1.8 seconds
Explanation:
Ignoring air friction
d = 1/2 at^2
15 = 1/2 (9.81) t^2 shows t = 1.75 = 1.8 seconds
A wire rope sling with a strength of 10,000 pounds and a total working load of 2,000 pounds has a design factor (multiplier) of ___.
The design factor or multiplier of the wire rope is 5.
What is design factor?
Design factor means the ratio of the ultimate failure strength of a member or piece of material or equipment to the actual working stress or intended safe load.
The design factor or multiplier of the wire rope is calculated as follows;
D.F = maximum strength / load
D.F = 10,000 / 2000
D.F = 5
Thus, the design factor or multiplier of the wire rope is 5.
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A____test instrument is a device that is installed in a process or at a bench to continually measure and display quantities.
The device that is installed in a process or at a bench to continually measure and display quantities is a permanent test instrument.
What is a measuring instrument?A tool for measuring a physical quantity is a measuring instrument. Measurement, in the physical sciences, quality control, and engineering, is the process of gathering and contrasting the physical amounts of things that actually happen in the real world. As units, pre-defined standard things and occurrences are used, and the measuring procedure yields a number that connects the subject-matter under investigation to the used unit of measurement. These numerical relationships are attained through the employment of measuring devices and formal test methodologies that specify the device's use. The instrument error and measurement uncertainty that affect all measuring devices varies in severity. From basic tools like stopwatches and rulers to electron microscopes and particle accelerators, these instruments can be used for various purposes.
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On newton's color wheel, colors that lie directly between a secondary and primary are called?
The colors that fall directly between a secondary and a primary on Newton's color wheel are referred to as intermediate colors
Isaac Newton revisited this same white sunlight's rainbow-colored dispersion when he was 23 years old. He noticed that the white sunshine was divided into red, orange, yellow, green, cyan, and blue light when he held a prism of glass in the direction of a beam of sunlight streaming through a hole in the blind of his darkened chamber. He found that the red, green, and blue areas of his rainbow's three distinct colors could be merged to create white light using prisms and mirrors. These are the fundamental hues, as he put it. Secondary hues were created when any two of these were blended. He noticed cyan-colored light when he blended blue and green light.
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A cyclist starts from rest and accelerates at 4.0 m/s^2 for 3.0 s. the cyclist then travels for 20 s at a constant speed. how far does the cyclist travel?
A cyclist starts from rest and accelerates at 4.0 m/s^2 for 3.0 s. After that, the biker travels for 20 seconds at a steady speed. The cyclist travels 258 meters.
How does uniform motion work?This kind of motion is described as the motion of an item traveling in a straight line while maintaining a constant speed along that path while it traverses equal distances in similar amounts of the time, regardless of the length of the time.
A body's acceleration must be zero if it is moving rectilinearly and is doing so consistently.
When an object is travelling uniformly, its speed remains constant. When an item moves uniformly, its displacement is given by the formula x=vt, where v stands for constant velocity and t for the motion's time interval.
Given by, is the displacement of a motion with constant acceleration.
v is constant velocity
t is time interval of the motion.
Given by, is the displacement of a motion with constant acceleration.
[tex]x=v_{i}t+\frac{1}{2}at^{2}[/tex], where
It has a constant acceleration of a
[tex]v_{i}[/tex] is the motion's time interval, and t is the beginning velocity.
Answer and justification
Given: The cyclist's starting speed is,
[tex]v_{i}[/tex]=0
The cyclist's initial acceleration is 4 m/s2.
The span of time during which motion has a constant acceleration is,
[tex]t_{1}[/tex]=3s
The cyclist's displacement in 3 seconds will be,
[tex]x_{1}= v_{i}t_{1}+\frac{1}{2}at_{1}^{2}=0(3)+\frac{1}{2}(4)(3)^{2}=18m[/tex]
After 3 seconds, the cyclist's final speed will be,
[tex]v_{f}= v_{i}+at_{1}=0+4(3)=12m/s[/tex]
t2=20s is the time interval for a cyclist traveling at a steady speed.
The biker will move x2 in the following 20 seconds at a constant speed,
x2=[tex]v_{f}t^{2}[/tex]=(1/2)(20)=240m
The biker will have covered a total distance of
x=x1+x2=18+240=258m.
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By observing the direction of current flow through the circuit, v oltage _____ can be determined.
Voltage polarity can be determined by the direction of current flow through the circuit
What is voltage polarity?All voltages and currents possess both magnitude and polarity. One current flows through the entirety of a series circuit with its polarity flowing from the negative battery terminal to the positive battery terminal. Polarities are also seen in voltage dips across loads. Utilizing the electron current's direction as a starting point is the simplest method for determining these polarities. The voltage is then negative where the electron current enters the load (Figure 31). No matter how many or what kind of loads are present in the circuit, this remains true. The potential drop is opposite of the source across the load. In opposition to the source voltage, the voltage dips lower it for the other loads.
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A pitcher throws a baseball at 43.4 m/s. when the baseball hits the catcher's mitt, it comes to rest over a distance of 0.1 meters. the average acceleration of the baseball was___m/s^2?
The average acceleration of the baseball is 9417.8 m/s².
To find the average acceleration, the given values are,
Initial velocity = 0
Final velocity = 43.4 m/s
Distance = 0.1 meters.
What is Acceleration?Acceleration is a rate of change of velocity with respect to time with respect to direction and speed.A point or an object moving in a straight line is accelerated if it speeds up or slows down.Acceleration is a vector quantity but it has both magnitude and direction.Acceleration formula can be written as,
Acceleration, a = (v - u ) / t m/s²
where, a - acceleration
v - Final velocity
u - Initial velocity
T - Time
Acceleration can be found by,
v² = v₀² + 2a ( x - x₀)
Rearranging the equation,
43.4² = 0 + 2a ( 0.1 m)
1883.56 = 0.2 a
a = 1883.56 / 0.2
a = 9417.8 m/s².
The acceleration of the baseball is 9417.8 m/s².
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On hoods where sashes open vertically, work with the hood sash in the _____ position
On hoods where sashes open vertically, work with the hood sash in the lowest position.
What Is A Sash On A Fume Hood?In the event of a fire, the fume hood sash offers a containment space. It functions as a blast barrier. The sash itself, together with the bypass grill above the sash, controls the fume hood's airflow properties. The sash's position does regulate the air velocity traveling through the fume hood, even if it has no effect on the amount of air passing through the fume hood. Air velocity is another element that affects chemical vapor capture. Raising the sash reduces the capture velocity, allowing vapors to start flowing over the sill and into the room's air.
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