Create a function called theme_by_year that takes as input a year (as an integer) and shows the theme ids and theme names (listed in order by theme id) that were in sets that year.
The column names must be id and name_themes (to differentiate between the name of a theme and the name of a set) in that order.
The index should be reset and go from 0 to n-1.
Each theme should only be listed once even if it appeared in more than one set from that year -- duplicate themes should be based on theme id and not name since there are some themes with the same name but with a different id.
We were supposed to merge the inventory_sets, sets, and theme data which is mainly what I was having the issue with with no duplicates for id
Answers
To create a function called theme_by_year that takes as input a year (as an integer) and shows the theme ids and theme names (listed in order by theme id) that were in sets that year, check the code below.
What is integer?A linear function's optimization within the context of a set of linear constraints over integer variables is expressed in programming as integer. Each and every one of the claims made in Linear programming: a production planning example is a linear programming model.
//CODE//
import pandas as pd def theme_by_year(yr):
df = pd.read_csv('sets.csv')
df = pd.read_csv('themes.csv')
new = sets[sets['year']==yr]
new = list(set(list(sets['theme_id'])))
name = []
new.sort()
for i in new:
st = str(themes[themes['id']==i]['name'])
st = st[1:]
st= st.strip("\nName: name, dtype: object")
name.append(st)
df =
pd.DataFrame(list(zip(new,name)),index=list(range(len(new))),columns=['id','name_themes'])
return df print(theme_by_year(int(input())))
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Related Questions
A lake with a surface area of 525 acres was monitored over a period of time. During onemonth period the inflow was 30 cfs (ie. ft3 /sec), the outflow was 27 cfs, and a 1.5 in seepage loss was measured. During the same month, the total precipitation was 4.25 inches. Evaporation loss was estimated as 6 inches. Estimate the storage change for this lake during the month.
Answers
Answer:
The storage of the lake has increased in \(4.58\times 10^{6}\) cubic feet during the month.
Explanation:
We must estimate the monthly storage change of the lake by considering inflows, outflows, seepage and evaporation losses and precipitation. That is:
\(\Delta V_{storage} = V_{inflow} -V_{outflow}-V_{seepage}-V_{evaporation}+V_{precipitation}\)
Where \(\Delta V_{storage}\) is the monthly storage change of the lake, measured in cubic feet.
Monthly inflow
\(V_{inflow} = \left(30\,\frac{ft^{3}}{s} \right)\cdot \left(3600\,\frac{s}{h} \right)\cdot \left(24\,\frac{h}{day} \right)\cdot (30\,days)\)
\(V_{inflow} = 77.76\times 10^{6}\,ft^{3}\)
Monthly outflow
\(V_{outflow} = \left(27\,\frac{ft^{3}}{s} \right)\cdot \left(3600\,\frac{s}{h} \right)\cdot \left(24\,\frac{h}{day} \right)\cdot (30\,days)\)
\(V_{outflow} = 66.98\times 10^{6}\,ft^{3}\)
Seepage losses
\(V_{seepage} = s_{seepage}\cdot A_{lake}\)
Where:
\(s_{seepage}\) - Seepage length loss, measured in feet.
\(A_{lake}\) - Surface area of the lake, measured in square feet.
If we know that \(s_{seepage} = 1.5\,in\) and \(A_{lake} = 525\,acres\), then:
\(V_{seepage} = (1.5\,in)\cdot \left(\frac{1}{12}\,\frac{ft}{in} \right)\cdot (525\,acres)\cdot \left(43560\,\frac{ft^{2}}{acre} \right)\)
\(V_{seepage} = 2.86\times 10^{6}\,ft^{3}\)
Evaporation losses
\(V_{evaporation} = s_{evaporation}\cdot A_{lake}\)
Where:
\(s_{evaporation}\) - Evaporation length loss, measured in feet.
\(A_{lake}\) - Surface area of the lake, measured in square feet.
If we know that \(s_{evaporation} = 6\,in\) and \(A_{lake} = 525\,acres\), then:
\(V_{evaporation} = (6\,in)\cdot \left(\frac{1}{12}\,\frac{ft}{in} \right)\cdot (525\,acres)\cdot \left(43560\,\frac{ft^{2}}{acre} \right)\)
\(V_{evaporation} = 11.44\times 10^{6}\,ft^{3}\)
Precipitation
\(V_{precipitation} = s_{precipitation}\cdot A_{lake}\)
Where:
\(s_{precipitation}\) - Precipitation length gain, measured in feet.
\(A_{lake}\) - Surface area of the lake, measured in square feet.
If we know that \(s_{precipitation} = 4.25\,in\) and \(A_{lake} = 525\,acres\), then:
\(V_{precipitation} = (4.25\,in)\cdot \left(\frac{1}{12}\,\frac{ft}{in} \right)\cdot (525\,acres)\cdot \left(43560\,\frac{ft^{2}}{acre} \right)\)
\(V_{precipitation} = 8.10\times 10^{6}\,ft^{3}\)
Finally, we estimate the storage change of the lake during the month:
\(\Delta V_{storage} = 77.76\times 10^{6}\,ft^{3}-66.98\times 10^{6}\,ft^{3}-2.86\times 10^{6}\,ft^{3}-11.44\times 10^{6}\,ft^{3}+8.10\times 10^{6}\,ft^{3}\)
\(\Delta V_{storage} = 4.58\times 10^{6}\,ft^{3}\)
The storage of the lake has increased in \(4.58\times 10^{6}\) cubic feet during the month.
The volume of water gained and the loss of water through flow,
seepage, precipitation and evaporation gives the storage change.
Response:
The storage change for the lake in a month is 1,582,823.123 ft.³How can the given information be used to calculate the storage change?Given parameters:
Area of the lake = 525 acres
Inflow = 30 ft.³/s
Outflow = 27 ft.³/s
Seepage loss = 1.5 in. = 0.125 ft.
Total precipitation = 4.25 inches
Evaporator loss = 6 inches
Number of seconds in a month is found as follows;
\(30 \ days/month \times \dfrac{24 \ hours }{day} \times \dfrac{60 \, minutes}{Hour} \times \dfrac{60 \, seconds}{Minute} = 2592000 \, seconds\)
Number of seconds in a month = 2592000 s.
Volume change due to flow, \(V_{fl}\) = (30 ft.³/s - 27 ft.³/s) × 2592000 s = 7776000 ft.³
1 acre = 43560 ft.²
Therefore;
525 acres = 525 × 43560 ft.² = 2.2869 × 10⁷ ft.²
Volume of water in seepage loss, \(V_s\) = 0.125 ft. × 2.2869 × 10⁷ ft.² = 2,858,625 ft.³
Volume gained due to precipitation, \(V_p\) = 0.354167 ft. × 2.2869 × 10⁷ ft.² = 8,099,445.123 ft.³
Volume evaporation loss, \(V_e\) = 0.5 ft. × 2.2869 × 10⁷ ft.² = 11,434,500 ft.³
\(Storage \, change \, \Delta V = \mathbf{V_{fl} - V_s + V_p - V_e}\)Which gives;
ΔV = 7776000 - 2858625 + 8099445.123 - 11434500 = 1582823.123
The storage change, ΔV = 1,582,823.123 ft.³Learn more about water resources and hydrology here:
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In the given circuit, V(t)=12cos(2000t+45)V, R1=R2=2Ω, L1=L2=L3=3mH and C1=250μF. You are required to find the Thevenin equivalent of this circuit using phasors. If you write the Thevenin voltage, Vth, in phasor form, what is the magnitude of this phasor? Put your answer in the box below without units.
Answers
The question is incomplete! Complete question along with answer and step by step explanation is provided below.
Question:
In the given circuit, V(t)=12cos(2000t+45)V, R1=R2=2Ω, L1=L2=L3=3mH and C1=250μF. You are required to find the Thevenin equivalent of this circuit using phasors.
a. If you write the Thevenin voltage, Vth, in phasor form, what is the magnitude of this phasor? Put your answer in the box below without units.
b. What is the value of the angle associated with the phasor Vth, in degrees?
c. Now, calculate the Thevenin impedance, Zth. What is the magnitude of this phasor?
d. What is the angle associated with the phasor Zth, in degrees?
Answer:
Vth = 6 < 45° V
Zth = 1.414 < 45°
a. The magnitude of the Thevenin voltage is 6 V
b. The phase angle of the Thevenin voltage is 45°
c. The magnitude of the Thevenin impedance is 1.414 V
d. The phase angle of the Thevenin impedance is 45°
Explanation:
The given voltage is
V(t)=12cos(2000t+45)
In phasor form,
V(t) = 12 < 45° V
So the magnitude of voltage is 12 V and the phase angle is 45°
Also the frequency ω = 2000
then the inductance is
L₁ = L₂ = L₃ = jωL = j×2000×0.003 = j6 Ω
and the capacitance is
C₁ = 1/jωC = 1/(j×2000×250x10⁻⁶) = -j2 Ω
and the resistance is
R₁ = R₂ = 2 Ω
Thevenin voltage:
The Thevenin voltage is the voltage that appears across the open-circuited terminals a-b (after removing L₃)
The Thevenin voltage is given by
Vth = V(t) × [ (R₂ + L₂) / (R₁ + L₁) + (R₂ + L₂) ]
Please note that there is no current flow in the capacitor due to open-circuited terminal a-b
Vth = 12 < 45° × [ (2 + j6) / (2 + j6) + (2 + j6) ]
Vth = 12 < 45° × [ (2 + j6) / (4 + j12) ]
Vth = 4.24264 + j4.24264 V
In phasor form,
Vth = 6 < 45° V
a. The magnitude of the Thevenin voltage is 6 V
b. The phase angle of the Thevenin voltage is 45°
Thevenin Impedance:
The Thevenin Impedance is the impedance of the circuit calculated when looking from the terminal a-b
Zth = [ (R₁ + L₁) × (R₂ + L₂) / (R₁ + L₁) + (R₂ + L₂) ] + (-j2)
Zth = [ (2 + j6) × (2 + j6) / (2 + j6) + (2 + j6) ] - j2
Zth = [ (2 + j6) × (2 + j6) / (2 + j6) + (2 + j6) ] - j2
Zth = [ (-32 + j24) / (4 + j12) ] -j2
Zth = [ (1 +j3) ] - j2
Zth = 1 + j Ω
In phasor form,
Zth = 1.414 < 45°
c. The magnitude of the Thevenin impedance is 1.414 V
d. The phase angle of the Thevenin impedance is 45°
Next, you prepare for the question-and-answer session that will follow your presentation. To predict what questions they may ask, you do a colleague test of your presentation. You should choose a colleague who has deep expertise in the electric vehicle industry.
Answers
You pick a teammate who has never worked in the sector before. This will enable you to make sure that you are not assuming anything or using lingo that your audience might not be familiar with.
What all things you can do ?
Run your presentation by a coworker or friend as a test.Prepare yourself to think about and explain the limitations of your data.Make sure you comprehend the goals of Gaea's stakeholders.Make sure you have a thorough understanding of Gaea stakeholder objectives before attempting to anticipate queries from stakeholders. Additionally, you want to run your presentation through a test audience and think about any data restrictions and explain them.
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1. In the palindromes program, the inner loop evaluates one string to see if it is a palindrome.True or False2 In the palindromes program, a potential palindrome is evaluated by comparing characters at both ends and working inwards.True or False3 In the palindromes program, the inner loop will not continue comparing characters once the it's determined that the string is not a palindrome.True or False4 The string 'i prefer pi' would be considered a palindrome by the original version of the palindromes program.True or False
Answers
True. In a palindrome program, the inner loop typically iterates through the characters of a string to check whether the string is a palindrome or not.
What is a Palindrome program?
A palindrome program is a computer program that checks whether a given input string is a palindrome or not. A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward when spaces, punctuation, and capitalization are removed.
A typical palindrome program involves iterating through the characters of the input string using a loop, comparing the characters at the beginning and end of the string and moving inward towards the middle of the string until either the entire string has been checked or a pair of characters that do not match is found. If all the characters match, the string is a palindrome; otherwise, it is not.
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Rank the following iron–carbon alloys and associated microstructures from the highest to the lowest tensile strength:
(a) 0.25 wt%C with spheroidite,
(b) 0.25 wt%C with coarse pearlite,
(c) 0.60 wt%C with fine pearlite, and
(d) 0.60 wt%C with coarse pearlite.
Answers
Answer:
adcb i believe the answer is
Hey guys can anyone list chemical engineering advancement that has been discovered within the past 20 years
Answers
Nanopesticides. The world population keeps growing. ...
Enantio selective organocatalysis. ...
Solid-state batteries. ...
Flow Chemistry. ...
Porous material for Water Harvesting. ...
Directed evolution of selective enzymes. ...
From plastics to monomers. ...
Label the following statements as either T (true) or F (false).
1) For Propane (C3H8) burning with theoretical amount of air, the air-fule ratio on the mole basis is 5.
2) The enthalpy of any substance at the standard reference state is 0.
3) 180% of theoretical air is equivalent to 80% of excess air.
4) The conservation of mass principle requires that the total number of moles on each side of a chemical reaction is equal.
5) The adiabatic flame temperature of methane (CH4) burning with pure oxygen and theoretical amount of air is the same, all other conditions being the same.
Answers
Answer:
1 its 1 bc you have to do it step by step
Explanation:
step by step
What does abbreviation vom stand for
Answers
Answer:
vom = Volt Ohm Meter
Explanation:
what's the best way to plan an organized
Answers
Answer:
Get ready and comfortable.
List all of the tasks you need to accomplish over the next week. .
Next schedule everything.
Get a planner/calender.
Cut those tasks that do not fit into your
Which of the following statements are true about staying safe while
working around all caught-in caught-between hazards?
Select two answers that apply.
What you should do changes based on hazards you’re exposed to.
You should be aware of any hazards that are present
You should be aware of the only hazards indicated as critical by management
What you should do is the exact same no matter the hazard
Answers
Answer:
What you should do changes based on the hazards you're exposed to.
You should be aware of any hazards that are present.
Which of the following is the most concrete and specific?
Building, White House, Shelter, or House.
Answers
The most concrete and specific term among the options provided is the White House. It refers to a particular building located in Washington, D.C., which serves as the official residence and workplace of the President of the United States. It has a distinct identity, history, and purpose, making it a highly specific and easily identifiable structure.
The White House is a globally recognized symbol of American governance and power. Its specific architectural design, located at 1600 Pennsylvania Avenue, sets it apart from generic buildings or houses. Unlike the terms "building" or "house," which can encompass a wide range of structures, the White House refers to a singular and iconic edifice with a rich historical significance. Its unique purpose as the center of American political leadership makes it the most concrete and specific option among those provided.
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the byodo-in temple in kyoto, japan, is an elegant example of what structural system?
Answers
The Byodo-in Temple in Kyoto, Japan, is an elegant example of the Heian Period architectural style, which incorporates the "shinden-zukuri" structural system.
The Byodo-in Temple in Kyoto, Japan, is a UNESCO World Heritage site and one of the most well-known examples of traditional Japanese architecture. It was built during the Heian period (794-1185) and is characterized by its elegant and graceful lines, intricate carvings, and use of natural materials. The structural system used in the temple is known as "daibutsu-yo" or "buddha-style" and is characterized by its heavy wooden brackets and ornate decorations. The system is named after the giant wooden statue of Buddha that is often found at the center of these temples. The daibutsu-yo system was developed in the 8th century and has been used in Japanese architecture ever since.
The shinden-zukuri structural system was developed during the Heian Period (794-1185) in Japan. It is characterized by a symmetrical layout, raised wooden platforms, and the use of natural materials like wood and thatch. The Byodo-in Temple is a beautiful example of this architectural style, showcasing its elegance and harmony with nature.
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If you had to pick a priority for future engineers, what would it be and why?
Answers
Answer:
Explanation:
Civil engineers have become experts in creating sustainable and environmentally friendly buildings and systems. Multiplied over many communities, the energy and emissions savings can make a real difference in the environment. Other life-improving functions can also make communities better places to live.Jul 19, 2017
What are some sources of resistance? (Check all
that apply.)
worn or damaged cables
loose cable connections
weak springs on work clamps
painted surfaces
rusty tables
Answers
Answer:
All of them.
Explanation:
I take this class rn too and those are answers
Which vegetation type do you think will cause fire to spread the fastest?
Explain why you chose that answer.
Answers
Answer:B
Explanation: Dead Grass more flammable than wood and Green grass contains water.
1.58 a current amplifier supplies 1 ma to a load resistance of 1 k£2. when the load resistance is increased to 12 k£2, the output current decreases to 0.5 ma. what are the values of the short-circuit output current and the output resistance of the amplifier?
Answers
A current amplifier supplies 1 mA to a load resistance of 1 kΩ. When the load resistance is increased to 12 kΩ, the output current decreases to 0.5 mA.
the output resistance of the amplifier.
Output voltage:
V0 = I0RLoad voltage:
\(VL = I0RLoad + I0RLoad/(1 + β)\)
Voltage gain of amplifier: AV = V0/VLAV
\(= 1 + β\)
\(= RL/(Rin + RL)Rin\)
\(= (RL/AV) - RLRin\)
\(= (RL/1.58) - RL\)
Short-circuit current formula:
\(Ishort-circuit = V0/RinIshort-circuit\)
\(
= (1 mA x RL)/(RL/1.58) - RL\)
= 1.58 mA
Output resistance is calculated using the following formula:
\(Rout = V0/Ishort-circuitRout\)
= 1 V/1.58 mA = 632.91 Ω
The short-circuit output current is 1.58 mA, and the output resistance of the amplifier is 632.91 Ω.
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How many different welding processes are in use?
Answers
There are basically five types of welding namely:
a)Gas Metal Arc Welding (GMAW/MIG)
b)Friction welding,
c)ELECTRON BEAM WELDING
d) LASER BEAM WELDING
e) RESISTANCE WELDING
What is welding?
Welding is a fabrication process in which two or more parts are joined together using of heat, pressure, or both to form a joint as the parts cool. materials to be welded include metals, thermoplastics, and wood.
Types of welding processes
a)Gas Metal Arc Welding (GMAW/MIG)
Used mainly for joining metals like stainless steel, nickel, copper alloys, aluminum, titanium, and cobalt.
b)Friction welding
This is a technique used to join materials using mechanical friction. this can be used to join wood, steel, and aluminum.
c)ELECTRON BEAM WELDING
This process uses a mean of high-velocity electrons to combine materials this can be used to join thick sections in the aerospace, automotive, rail, and nuclear power industry.
d)LASER BEAM WELDING
this is used to combine pieces of metal or thermoplastics.
e) RESISTANCE WELDING
This is a process that joins metals by applying pressure and passing a current through them for a period of time.
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Q.3Set. (C) 1000 hours of Testing of a sensor reveals the following data. Two samples out of twenty sensors failed after 900 and 800 hours respectively and balance 18 samples worked fine even after 1000 hours of testing. The customer specified reliability of 0.95How many hours of operation of sensors can be guaranteed based on above data.
Answers
Answer:
The ACT Science test explained below begins on page 40 of the guide. Please note that the 2020-2021 guide features the same practice test
Explanation:
This term describes the dominant organizations, institutions, groups, and processes of the pre-Internet era. Core Crew None of these. Platform Crowd
Answers
The term that describes the dominant organizations, institutions, groups, and processes of the pre-Internet era is "Core Crew."
Core Crew refers to a small, tight-knit group of people who were responsible for the creation, development, and maintenance of a particular project or organization. They were the experts and decision-makers, and they controlled the flow of information and resources. "Platform Crowd" refers to the decentralized, networked model of organization that emerged with the rise of the Internet and social media. It is characterized by the participation of a large, diverse group of users who contribute to the creation and dissemination of content and ideas.
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The storage tanks are on a platform placed next to the building at the second-floor level. Based on the potential hazards, are there any concerns about the space immediately below the tanks
Answers
The should be no concerns about the space immediately below the tanks because there will be no damage to anything if any peril causes the tank to falls.
What are potential hazards?Potential hazards refers to the active source for potential damage on a building, structure etc
It is important we know that the storage tanks are placed on a platform next to the building at the second-floor level but nothing beneath the tanks stands.
Hence, there should be no concerns about the space immediately below the tanks because there will be no damage to anything if any peril causes the tank to falls.
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pls i need help with this
Solve using Matlab three problems:
One using the combination formula
One using the permutation of n objects formula
One using the permutation of r objects out of n objects
You can make up your own questions
Answers
Answer:
%%%%Problem 1%%%
while n<1:
c=(n!)/((n-r)!(r!))
end
%%end of solution 1%
Para un intercambiador de calor encargado de precalentar pulpa de fruta, se utiliza agua caliente que entra a 180°C y sale a 78°C, mientras que la pulpa de fruta entra a 3°C y sube su temperatura hasta 55°C. Realizar los esquemas de perfil de temperaturas para un intercambiador de calor que funcione en paralelo y en contracorriente. Además, calcular LMTD.
Answers
Answer:
La diferencia media logarítimica de temperatura del intercambiador en paralelo es aproximadamente 75.466 ºC.
La diferencia media logarítmica de temperatura del intercambiador en contracorriente es aproximadamente 97.881 ºC.
Explanation:
De la teoría de Transferencia de Calor tenemos que un intercambiador de calor en paralelo presenta las siguientes dos características:
1) Tanto el fluido caliente como el fluido frío entran por el mismo lado.
2) Tanto el fluido caliente como el fluido frío salen por el mismo lado.
Mientras que el intercambiador de calor en contracorriente tiene que:
1) El fluido caliente y el fluido frío entran por lados opuestos.
2) El fluido caliente y el fluido frío salen por lados opuestos.
A continuación, anexamos los esquemas de perfil de cada intercambiador.
Ahora, la Diferencia Media Logarítimica de Temperatura (\(\Delta T_{lm}\)), medida en grados Celsius, queda definida como sigue:
\(\Delta T_{lm} = \frac{\Delta T_{1}-\Delta T_{2}}{\ln \frac{\Delta T_{1}}{\Delta T_{2}} }\) (Eq. 1)
Donde \(\Delta T_{1}\) y \(\Delta T_{2}\) son las diferencias de temperatura de los fluidos en cada extremo del intercambiador, medido en grados Celsius.
Procedemos a determinar esas diferencias y la Diferencia Media Logarítimica de Temperatura para cada configuración:
Intercambiador en paralelo
\(\Delta T_{1} = 180\,^{\circ}C-3\,^{\circ}C\)
\(\Delta T_{1} = 177\,^{\circ}C\)
\(\Delta T_{2} = 78\,^{\circ}C - 55\,^{\circ}C\)
\(\Delta T_{2} = 23\,^{\circ}C\)
\(\Delta T_{lm} = \frac{177\,^{\circ}C-23\,^{\circ}C}{\ln \frac{177\,^{\circ}C}{23\,^{\circ}C} }\)
\(\Delta T_{lm} \approx 75.466\,^{\circ}C\)
La diferencia media logarítimica de temperatura del intercambiador en paralelo es aproximadamente 75.466 ºC.
Intercambiador en contracorriente
\(\Delta T_{1} = 180\,^{\circ}C-55\,^{\circ}C\)
\(\Delta T_{1} = 125\,^{\circ}C\)
\(\Delta T_{2} = 78\,^{\circ}C-3\,^{\circ}C\)
\(\Delta T_{2} = 75\,^{\circ}C\)
\(\Delta T_{lm} = \frac{125\,^{\circ}C-75\,^{\circ}C}{\ln \frac{125\,^{\circ}C}{75\,^{\circ}C} }\)
\(\Delta T_{lm} \approx 97.881\,^{\circ}C\)
La diferencia media logarítmica de temperatura del intercambiador en contracorriente es aproximadamente 97.881 ºC.
Metal and dirt are not considered contaminants to oil. a) trueb) false
Answers
Answer:
False, metal and dirt ARE considered contaminants!
Explanation:
i ride motocross! trust me!
The statement "Metal and dirt are not considered contaminants to oil" is false. The correct option is B.
What are metals?Metals are chemical elements that have high thermal and electrical conductivity, and they are soft and ductile. Magnesium, helium, gold, and silver are metals. They are very reactive, and they contain both gas and solids.
Oil and dirt are considered contaminated to oil. It causes a chemical reaction in the oil, that's why it is a problem with contamination of the oil. It causes reactions like depletion or oxidation.
In motor oils, there are many chances of pollution with dirt and metals, and other oxides. This causes debris and leads to degradation of work of lubrication of engine parts, which causes friction.
Thus, the statement is true. The correct option is B.
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what do you need to craft netherite ingots come on man you should know this
Answers
4 netherite scrap and 4 gold
in a crafting table
.Answer by true (T) or false (F) with a justification if, and only if, the answer is FALSE.
1. Testing is the most time consuming and expensive part of software development
Justification :
2. Software testing depends on the size of the software being tested
Justification :
3. Software testing depends on the type of product being developed? (ex: experimental, life-critical)
Justification :
4. The existence of errors not detected by test cases in the modules does not necessarily imply
the misbehavior of the system.
Justification :
5. Testing is to ensure that the software does what it is supposed to do and also to ensure the software does not do what it is not supposed to do
Justification :
6. A system may deliver the expected result even with the existence of faults.
Justification :
7. Validation capture customer requirements. Verification ensure that the system is built
according to specification
Justification :
Answers
The following are the statements on the use of Software:
1. False: Testing is a crucial aspect of software development, but it is not always the most time-consuming and expensive part of the process. Depending on the complexity of the software and the development methodology being used, other activities such as design, coding, and project management may take longer and cost more.
2. True: The amount of testing required for software is typically proportional to the size of the software. Larger software programs are more complex and require more testing to ensure their functionality and stability.
3. True: The type of software being developed can also affect the testing process. For example, software that is used in life-critical situations will require more rigorous testing than software that is experimental or used for non-critical purposes.
4. True: The presence of errors in individual modules does not necessarily mean that the entire system is malfunctioning. Other factors such as the configuration of the system or user error may also cause issues.
5. True: Testing serves two main purposes: to ensure that the software performs its intended functions correctly and to ensure that it does not perform unintended functions or produce unexpected results.
6. True: A software system may still provide the expected output even with the presence of faults or errors. However, the system's overall quality may be compromised, and its stability and performance may suffer.
7. True: Validation and verification are two separate but related activities in the software development process. Validation ensures that the software meets the customer's requirements, while verification ensures that the software is built according to specification.
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in a regular pyramid, the slant height is always longer than a lateral edge of the pyramid. true or false
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The statement "In a regular pyramid, the slant height is always longer than a lateral edge of the pyramid" is false.
In a regular pyramid, the slant height refers to the distance from the apex (top) of the pyramid to any point on the lateral face, measured along the slanted surface. A lateral edge, on the other hand, refers to the length of an edge that connects the apex to a vertex of the base.
In a regular pyramid, the slant height and the lateral edge are typically not equal to each other. The slant height is generally longer than a lateral edge. This can be understood by considering the shape of a regular pyramid, where the slant height forms a diagonal along the lateral face, while the lateral edge is a straight line connecting the apex and a vertex of the base.
However, it is important to note that the specific lengths of the slant height and lateral edge depend on the dimensions of the pyramid, such as the base size and the height. The relationship between the slant height and lateral edge can vary depending on the specific measurements of the regular pyramid.
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A 1 mm diameter steel wire (E-210 GPa, Sy 210 MPa) is close coiled into a helix around a 25 mm diameter rigid cylindrical drum. What will be the inside diameter of the coil when it is released from the drum.
Answers
The inside diameter of the released coil is approximately 24.67 mm, which was found using the formula for deflection of a helical spring with given wire and mean coil diameters.
To determine the inside diameter of the coil when released from the drum, we need to use the formula for the deflection of a helical spring under axial loading, which is given as:
δ = (8FD³)/(Gd⁴n)
where:
δ is deflection of the spring (m)
F is axial force applied to the spring (N)
D is mean coil diameter (m)
d is wire diameter (m)
n is number of active coils
G is shear modulus of elasticity (Pa)
We can assume that the axial force on the spring is zero, since the wire is simply being released from the drum without any external load.
Therefore, the equation simplifies to:
δ = (8GD³)/(d⁴n)
We can rearrange this equation to solve for the inside diameter of the coil (dᵢ):
dᵢ = D - 2nd
We know the following values:
d = 1 mm , D = 25 mm, n = the number of active coils is not given and needs to be determined and G = 210 GPa = 210 × 10⁹ Pa.
To find the number of active coils, we need to assume a pitch (distance between adjacent coils) for the spring.
Let's assume a pitch of 1.5 times the wire diameter, or 1.5 mm.
Then the length of one coil would be πd = 3.14 mm, and the number of active coils would be:
n = D/p = 25/1.5 = 16.67 (rounded to the nearest whole number)
Substituting these values into the equation for the inside diameter of the coil, we get:
dᵢ = D - 2nd
dᵢ = 25 - 2 × 16.67 × 0.001
dᵢ = 24.67 mm
Therefore, the inside diameter of the coil when it is released from the drum would be approximately 24.67 mm.
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relationship between team performance and team dynamics
Answers
Answer:
Group dynamics can be understood as how team member's distinct roles and behaviours impact other group members and the group as a whole. Team dynamics are therefore the unconscious, psychological factors that influence the direction of a team's behaviour and performance.
What is the Laplace Transform of:
f(t)=6e^(−5t)+e^(3t)+5t^3−9
Answers
\(\boxed{ℒ_t[f(t)] =\frac{30}{{s}^{4} } - \frac{9}{s} + \frac{6}{s + 5} + \frac{1}{s - 3}} \)
This holds true because:
\(\lim_{s\to\infty} [\frac{30}{{s}^{4} } - \frac{9}{s} + \frac{6}{s + 5} + \frac{1}{s - 3}] =0 \)
[The answer is throughly verified, hence you can trust this :)]
A certain practical dc voltage source can provide a current of 5 A when it is (momentarily) short- circuited, and can provide of 35 W to a 20 Ω
load. Find
(a) The open-circuit voltage
(b) The maximum power it could deliver to a well-chosen RL
(c) What is the value of that RL
?
Answers
(a) The open-circuit voltage is 25 V.
(b) The maximum power it could deliver to a well-chosen RL is 28.75 W.
(c) The value of that RL is 7.5 Ω.
Calculation of Voltage, Power and Resistance(a) The open-circuit voltage is calculated using Ohm's Law:
V = I × R
V = 5 A × 0 Ω (since the source is momentarily short-circuited)
V = 25 V
(b) The maximum power it could deliver to a well-chosen RL is calculated using the equation:
P = V2/R
P = (25 V)2/R
P = 625/R
R = 625/P (where P is the power delivered to the load, i.e. 35 W)
R = 17.86 Ω
(c) The value of that RL is calculated using the equation:
R = V2/P
R = (25 V)2/35 W
R = 7.5 Ω
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