Questions Asked on
February 3, 2020

Physics
Silicon is doped with 2.0∗1016 arsenic atoms per cm3 . Assume an intrinsic carrier concentration equal to 1.7∗1010cm−3 at room temperature. What is the minority carrier concentration at room temperature ( T=300K ) in 104cm−3 ?
asked by Ram 
world history
Which plan proposed to maintain open trade between China and Western nations? Missionary Diplomacy Open Door policy National Sovereignty Salutary Neglect B?
asked by IG emmajfkci 
Physics
Which of the dopant materials below can be used in order to achieve ndoping, considering Si as the bulk material? Ge In Ga As
asked by Ram 
Science
Calculate the number of atoms of chlorine present in 7.45g of KCL
asked by Daisy 
Science
Consider a small module based on interconnected tandem cells of hydrogenated amorphous and microcrystalline silicon as depicted in the figure below. The Voc of a single tandem cell is 1.35V and the shortcircuit density Jsc is 12mA/cm2. Which combination
asked by Ram 
Chemistry
The diffusion coefficient of electrons in silicon is De=36cm2s−1 . In a silicon layer, the electron density drops linearly from n=2.7∗1016cm−3 down to n=1015cm−3 over a distance of 2μm . What is the electron diffusion current density Jdiff,e (in
asked by Ram 
Math
Study the following diagram, where point C lies in the exterior of circle O. Segment WC is tangent to circle O at point W. CO¯¯¯¯¯¯¯¯, CW¯¯¯¯¯¯¯¯¯, and OW¯¯¯¯¯¯¯¯¯ are drawn in to create △OWC. If WC=15 and CO=17, what is OW?
asked by nini 
Geography
According to the information in the chart for which are the following countries has the greatest amount of oil reserves
asked by Connexus 
statistics
The random variable W can take on the values of 0, 1, 2, 3, or 4. The expected value of W is 2.8. Which of the following is the best interpretation of the expected value of random variable W? A. A randomly selected value of W must be equal to 2.8. B.The
asked by Anonymous 
math
Find the perimeter of the triangle whose vertices are the following specified points in the plane. (−9,−6),(−3,−6) and (9,−4)
asked by Anonymous 
Solar energy
The table below shows the total area, sun hours per day and energy consumption of five different countries: the United States, India, Brazil, Spain and the United Kingdom. Country Area ( km2 ) Sun hours per day Energy Consumption ( MWh/year ) United States
asked by Ram 
chemistry
Predict the rate of change in the concentration of N2O over this time interval. In other words, what is Δ[N2O]/Δt?
asked by lee 
Math
solves 2x +3y=40, 5x +2y=34
asked by Aliyu habibu 
chemistry
In the first 14.0 s of the reaction, 1.7×10−2 mol of O2 is produced in a reaction vessel with a volume of 0.340 L What is the average rate of the reaction over this time interval? 2 N2O(g) → 2 N2(g)+O2(g)
asked by mia 
English
What would be a good topic for a compare and contrast essay? I need some ideas please!
asked by Bella 
Math
9^2y * 2^x = 72 Value of x and y
asked by King 
Social Studies
Which groups were considered citizens in ancient Greece? Select the three correct answers. A. aristocrats B. tenant farmers C. small farmers D. slaves E. foreigners F. women
asked by Brooklyn, I´m A Boy 
math
could i get a step by step explanation for factoring this trinomial? i don't seem to understand how to get the final answer as i always get 2x(x+2)+x+2 2x^2+5x+2
asked by Kaleb Witlox 
Math
The area of the trapezoid student election sign is 5 square ft find two possible values for each base
asked by Paige 
Science
Which of the following statements is NOT true about solar inverters? A standalone inverter is supposed to work as an AC voltage source for a specified range of AC loads. An ideal gridtied inverter has its operational voltage and frequency synchronized
asked by Ram 
chemistry
Attempt 2 If the density of solid iron is 7.87 g/cm 3 , what is the packing efficiency of Fe if it adopts a body‑centered cubic unit cell? The molar mass of Fe is 55.847 g/mol .
asked by Olivia Jones 
Business Math
The supply and demand for a product are given by 2p − q = 100 and pq = 300 + 25q, respectively. Find the market equilibrium point.
asked by Haris A Khan 
Statistics
assuming that boys and girls are equally probable find the number of families out of 1600 each having 5 children with 3 boys,5 girls,2or3 boys and all children of the same sex.
asked by Vikas dadhich 
Math
Segment WX is shown W•————————•X Explain how you would construct a perpendicular bisector of WX using a compass and a straightedge.
asked by Chloe 
Geography
What is an informal statement expressing the commission's opinion on a public matter? A: petition B: law C: resolution D: formal statement I think it is d but I need help please?
asked by Anonymous 
poetry
What is the best paraphrase of these lines from “Stopping by Woods on a Snowy Evening”? The woods are lovely, dark, and deep, / But I have promises to keep A. I would like to stay, but I have too many other responsibilities. B. I made a promise that I
asked by were 
social studies
french settlers came to america for all the following reasons except
asked by buzz 
Science
1. Which of the following is true about photosynthesis? A) It is an exothermic reaction. B) It is an endothermic reaction.** C) It produces carbon dioxide. D) It occurs in animals. 2. Atomic theory is A) subject to change if new information is discovered.
asked by Ⓙⓤⓟⓘⓣⓔⓡ 
Math
9. A relation contains the points (5,10) , (2,4), (1,2),(4,8), (5,10). Is this a function? Explain (2 points) Please help!
asked by smol might 
math
Three squirrels, Steve, Keith and Benjamin, have spent all day collecting nuts. At the end of the day they are very tired and go to bed. During the night, Steve wakes up and eats a nut. He then decides to take half of the remaining pile and hides it before
asked by Savvas 
Science
Based on the following chemical equation how many molecules of Hydrogen (H) are present in the reactants side? 2H2 + O2 > 2H2O a. 1 b. 2 c. 3 d. 4
asked by An 
science
Which term would also correctly describe a scavenger? producer decomposer herbivores carnivore** i choose carnivore but i also think it can be decomposer
asked by anime_is_coo, 
Math
Question text At the beginning of a race, a yacht crosses the start line and sails in a westerly direction at a speed of 6 m s1. The current of the sea is flowing at 2 m s1 towards the northeast. Calculate how farand in what direction (relative to
asked by dee 
Civics
1.Under which circumstances might a u.s President send federal soldiers to enforce order in a state A. If a state needed help in collecting income tax. B. If a state's elected governor committed a crime C. If a states collected tolls on an interstate
asked by 🍦ice cream🍦 
geography
French settlers came to America for all the following reasons except: to convert Native Americans to Christ gold adventure furs
asked by Ryan 
spanish
For the following paragraph, decide if the verb for each blank should be in preterite or imperfect. Cuando Marcos ___1___ (ser) joven, él ___2____ (querer) ser médico. La medicina le ____3_____ (interesar) mucho porque a él le ____4____ (gustar) ayudar
asked by john 
Physics
A uniform electric field of 775 N/C is produced within a particle accelerator. Starting from rest, what are the following? (a) the speed of an electron placed in this field after 25.4 ns have elapsed m/s (b) the speed of a proton placed in this field after
asked by AAA 
calculus
Expand 4/(x^2+4) as a power series centered at 0.
asked by maath 
Science
Consider a crystalline PV module with the following output parameters mentioned at STC (Standard Test Conditions) conditions by the manufacturer. Pmax = 300 W Voc = 40 V Isc = 8 A NOCT = 40°C Temperature coefficient of power = 2 W/°C If the ambient
asked by Ram 
Chemistry
By means of ion/electron part equations, write fully balanced equations for the following reaction: the production of hydrogen by the action of hydrochloric acid on magnesium. I'm so confused as to why Cl, because it says hydrochloric acid, is not used as
asked by Jack 
Business Math
The supply function for a product is 2p − q − 50 = 0, while the demand function for the same product is (p + 10)(q + 30) = 9600. Find the market equilibrium point.
asked by Haris A Khan 
Business Math
Suppose a company has fixed costs of $2400 and variable costs per unit of 3/4x + 1690 dollars, where x is the total number of units produced. Suppose further that the selling price of its product is 1800 − 1/4x dollars per unit. (a) Find the breakeven
asked by Haris A Khan 
chemistry
what is salt
asked by Queen 
Math
Determine the area of the shaded region. Use 3 for pi. (Picture is a shaded square with 4 equivalent unshaded circles inside; each side of the square measures 12 inches.) Help?
asked by Melissa 
Chemistry
Calculate the delta G
asked by Sunshine 
Maths
If the GCF (x, 36) is 4 and LCM (x, 36) is 288, then find the number x.
asked by Edilawit 
Civic education
List the wold civic poblems
asked by Sulaiman saminu 
Physics
The loaded coaster has a mass of 2000 kg. The starting point of the run (B) is 25 m above point A; the run from B to C is 120 m long, the run from C to D is 150 m. At D, brakes are applied, bringing the coaster to a halt X m further along, at E. The
asked by Arkonite 
Chemistry
A 0.1845g sample of molybdenum metal is covered with hydrochloric acid and heated until the reaction is complete and excess chlorine is driven off. When weighed, the final product of the metal and chlorine had a mass of 0.5936g. What is the empirical
asked by Amanda Perkins 
Math
5+x= 14
asked by Amanda 
chemistry
any one know how i can solve this question? What are the values of q, w, ΔU, ΔH, ΔS, ΔSsurr, and ΔSuniv for the following constant pressure process for a system containing 0.956 moles of CH3OH ? CH3OH(g, 122.0 ºC, 1.00 atm) ⟶ CH3OH(l, 34.0 ºC,
asked by leo 
Social studies
What is caste?
asked by Tae💯💯 
Careers
What career am I going to follow Tourism ,life science ,maths lit ,consumer Studies
asked by Anonymous 
maths
gemma is making necklaces. she needs 10 beads for each one. she has 73 beads altogether. how many necklaces can she make?
asked by rehab 
Math
There was 64 times of polonium 235 when the earth was being formed then it is now, the half life of polonium 235 is 7.1x10^8 use the information above to estimate the age of the earth.
asked by Anonymous 
math
1. There are 5 red crayons, 6 yellow crayons, and 11 blue crayons in a shoebox. What is the ratio of the total number of crayons to the number of yellow crayons? (1 point) a.6:22 b.6:16 c.22:6 d.16:6
asked by IT KHALIYAH 
science
1.the atomic model would be rivsed if?
asked by @miggssanchezz 
Geography
the prehistoric culture known for their larger agricultural communities are? A: Anaszi B: Fremont C:Pueblo D:Pueblo bonito.
asked by Hi 
chemistry
What is w when a gas is compressed from 49.7 L to 37.7 L using a constant external pressure of 747 Torr? Note: 760 Torr = 1 atm = 1.01325 bar = 101.325 kPa
asked by tin 
Physics
1. As you and your bandmates prepare to rehearse, you push on your drum set to slide it into position. You exert a force of F = 24 N, kinetic friction opposes the motion with a force of Ff = 22 N, and you slide the drums a distance of d = 1.5 m. What is
asked by Andrew 
science
2 K + CL2 > 2 KCL
asked by cairo 
Chemistry
A metal X forms two different chlorides. If 12.7g of chloride A and 16.3g of chloride B contain 7.1g and 10.7g of chlorine respectively, show that the figures agrees with the law of multiple proportions. Write their formulae
asked by Maryjane 
Physics
Electron concentration in ntype region (in 1018cm−3 ):
asked by Ram 
Math
“Both are powers of the same variable,” what exactly does this mean? Can someone please explain.
asked by Nyla 
Math
A survey was conducted between males and females to see if they prefer cheeseburgers or hamburgers. The results of the survey are posted in the Venn diagram below. Cheeseburger: 26 Female: 18 Both: 21 Neither: 16 Find the probabilities as percents...
asked by Ember Lovet 
Math
Solve equation 2log10^x  3log10^2 + log10^32 = 2
asked by King 
Math
16= \,\,\frac{1}{2}(7x+8) 2 1 (7x+8)
asked by Anonymous 
Math
Nancy had an I come of $26,500 this year if the inflation rate was 11% what was her purchasing power
asked by Devin 
Math
Perry made $34,885 this year if the inflation rate was 6.5% how much was his salary actually worth
asked by Devin 
English
I need 2 seprate paragraphs about "the stone" and "the three brass pennies" pls help Identify the theme of the story in your topic sentence . Include several supporting details from the text. Explain how those details develop or support the theme of the
asked by 🍎 
math
f 5 out of 25 people don't like chocolate ice cream, what percent of the people do not like chocolate ice cream? A. 20% B. 5% C. 80% D. 30% pls help
asked by IT KHALIYAH 
Math
Larry ran 15 miles per hour for 24 seconds. How many yards did Larry run
asked by Mal 
Social studies
How did John browns raid at harpers ferry further increase sectionalism in the southern states
asked by Kylie 
math
t^3=64/27 what does t equal *must give answer in fraction with steps*
asked by hi 
Global Studies
Please help with this FAST! Which of the following are the main factors that led to World War I? Select the two correct answers. A. the rise of fascism in some European countries B. the invention of nuclear weapons and disagreement over their use C. the
asked by Anonymous 
social studies
Which of the following suggests that the Indus Valley people had a strong system of central government? A. Their priests conducted many religious ceremonies.***** B. They had a system of weights and measurements. C. Their jewelers used precious stones to
asked by Julia Vega 
History
What was the direct cause of the U.S. entry into World War II? A. the bombing of Pearl Harbor B. the invasion of Poland by Germany C. the capture of Belgium by Germany** D. the Battle of Britain I think its b or c
asked by Frankie Gains 
math
Note: Enter your answer and show all the steps that you use to solve this problem in the space provided. Use the circle graph shown below to answer the question. A pie chart labeled Favorite Sports to Watch is divided into three portions. Football
asked by IT KHALIYAH 
Chemistry
In a constant‑pressure calorimeter, 75.0mL of 0.950 M H2SO4 was added to 75.0 mL of 0.250 M NaOH. The reaction caused the temperature of the solution to rise from 23.24∘C to 24.94∘C. If the solution has the same density and specific heat as water
asked by Riley 
geography
The one European country that did NOT establish settlements in North America was: Spain France Portugal England
asked by Ryan 
Probability
12 cards with letters in the word INDEPENDENCE are put into a bag. Two cards are randomly selected. The first card selected is not replaced. Find the probability that both card show vowels.
asked by Anonymous 
Chemistry
For the equilibrium br2(g)⇌2Br(g), Kc=0.00104 at 1285 degrees C. What will be the equilibrium concentration of both species if 1.00 mole Br2 is put into 1.00 L at 1285 degrees C?
asked by Joe 
Math
I am a 2 digit number the sum of my digits is 15 my t and digit is odd my ones digit is even what number am I
asked by Haley 
Probability
A jar contains the number discs 5, 10, 15, 20, 25. Brosnan picks two number discs from the jar without looking. Find the probability that the numbers picked are both multiples of 10.
asked by Anonymous 
ap lit
What might Jackson be satirizing?
asked by Anonymous 
Geography
What is Mineral science
asked by Malik 
Statistics
How would I permutate n books on n shelves, with no limit on how many books could be placed on a shelf?
asked by Cheese 
math
You are having a lemonade stand and the ingredients to make lemonade comes out to about $.08 per cup. If you sell each cup for $.75 by what percentage did you markup a cup of lemonade?
asked by robin 
science
A ____, such as H2O4, is a symbol that shows the elements in a compound and the ratio of atoms.
asked by oh no 
Physics
The total charge on a uniformly charged ring with diameter 26.0 cm is −57.3 µC. What is the magnitude of the electric field along the ring's axis at the following distances from its center? (a) 2.60 cmN/C, (b) 13.0 cmN/C, (c) 26.0 cm N/C, (d) 2.08 m N/C
asked by AAA 
English
From "Stopping by Woods on a Snowy Evening" by Robert Frost Whose woods these are I think I know. His house is in the village, though; He will not see me stopping here To watch his woods fill up with snow. 1. How many metrical feet are there in each of
asked by Haliey 
Math
An MP3 player costs $80. A student has a coupon for 1/4 off. The student saves $7 per week. Assuming the price of the MP3 player does not change, how long will it take the student to save enough to buy it?
asked by Lakota 
math
Find the equation of the line containing the point ( 1, 2 ) and perpendicular to the line containing the points ( 1, 5 ) and ( 3, 2 )
asked by Anonymus 
geometry
A kite flying in the air has a 12ft line attached to it. Its line is pulled taut and casts an11  ft shadow. Find the height of the kite. If necessary, round your answer to the nearest tenth.
asked by mimi 
prealgebra
How do you find the surface area of a cylinder, and can you please give me the formula? Hailey
asked by Haliey 
Math
Maribeth works in a dog rescue centre. At feeding time, 5 of the dogs each get 3/4 kg of food and 3 dogs each get 3/5 kg of food. How much food does Maribeth feed to the dogs?
asked by Jonathan 
statistics
Let the random variable X represent the number of people living in a household in a certain town. The standard deviation of X is 1.8. Which of the following statements is the best interpretation of the standard deviation? A.The number of people living in a
asked by Anonymous 
Math
Find the amount hog federal income tax withheld from Sharon lees monthly paycheck of $8612.50 using the percentage method. She is single and claims 2 withholding dependents
asked by Yazmin 
Math
Mountain View hotel’s employs 114 workers with a gross payroll of $91898 fringe benefits are 42.29 per employee
asked by Yazmin 
Math
The weekly payroll of Tobeys hardware includes 19 employees who earn $280 how much is the employers share of total social security and Medicare taxes for the first quarter
asked by Yazmin