Questions Asked on
February 3, 2020

  1. 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
  2. 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
  3. Physics

    Which of the dopant materials below can be used in order to achieve n-doping, considering Si as the bulk material? Ge In Ga As

    asked by Ram
  4. Science

    Calculate the number of atoms of chlorine present in 7.45g of KCL

    asked by Daisy
  5. 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 short-circuit density Jsc is 12mA/cm2. Which combination

    asked by Ram
  6. 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
  7. 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
  8. Geography

    According to the information in the chart for which are the following countries has the greatest amount of oil reserves

    asked by Connexus
  9. 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
  10. 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
  11. 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
  12. 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
  13. Math

    solves 2x +3y=40, 5x +2y=34

    asked by Aliyu habibu
  14. 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
  15. English

    What would be a good topic for a compare and contrast essay? I need some ideas please!

    asked by Bella
  16. Math

    9^2y * 2^x = 72 Value of x and y

    asked by King
  17. 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
  18. 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
  19. Math

    The area of the trapezoid student election sign is 5 square ft find two possible values for each base

    asked by Paige
  20. Science

    Which of the following statements is NOT true about solar inverters? A stand-alone inverter is supposed to work as an AC voltage source for a specified range of AC loads. An ideal grid-tied inverter has its operational voltage and frequency synchronized

    asked by Ram
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. social studies

    french settlers came to america for all the following reasons except

    asked by buzz
  28. 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 Ⓙⓤⓟⓘⓣⓔⓡ
  29. 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
  30. 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
  31. 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
  32. 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,
  33. 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 s-1. The current of the sea is flowing at 2 m s-1 towards the north-east. Calculate how farand in what direction (relative to

    asked by dee
  34. 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🍦
  35. geography

    French settlers came to America for all the following reasons except: to convert Native Americans to Christ gold adventure furs

    asked by Ryan
  36. 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
  37. 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
  38. calculus

    Expand 4/(x^2+4) as a power series centered at 0.

    asked by maath
  39. 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
  40. 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
  41. 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
  42. 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 break-even

    asked by Haris A Khan
  43. chemistry

    what is salt

    asked by Queen
  44. 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
  45. Chemistry

    Calculate the delta G

    asked by Sunshine
  46. Maths

    If the GCF (x, 36) is 4 and LCM (x, 36) is 288, then find the number x.

    asked by Edilawit
  47. Civic education

    List the wold civic poblems

    asked by Sulaiman saminu
  48. 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
  49. 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
  50. Math

    -5+x= 14

    asked by Amanda
  51. 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
  52. Social studies

    What is caste?

    asked by Tae💯💯
  53. Careers

    What career am I going to follow Tourism ,life science ,maths lit ,consumer Studies

    asked by Anonymous
  54. 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
  55. 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
  56. 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
  57. science

    1.the atomic model would be rivsed if?

    asked by @miggssanchezz
  58. Geography

    the prehistoric culture known for their larger agricultural communities are? A: Anaszi B: Fremont C:Pueblo D:Pueblo bonito.

    asked by Hi
  59. 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
  60. 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
  61. science

    2 K + CL2 ---> 2 KCL

    asked by cairo
  62. 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
  63. Physics

    Electron concentration in n-type region (in 1018cm−3 ):

    asked by Ram
  64. Math

    “Both are powers of the same variable,” what exactly does this mean? Can someone please explain.

    asked by Nyla
  65. 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
  66. Math

    Solve equation 2log10^x - 3log10^2 + log10^32 = 2

    asked by King
  67. Math

    16= \,\,\frac{1}{2}(7x+8) 2 1 ​ (7x+8)

    asked by Anonymous
  68. 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
  69. Math

    Perry made $34,885 this year if the inflation rate was 6.5% how much was his salary actually worth

    asked by Devin
  70. 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 🍎
  71. 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
  72. Math

    Larry ran 15 miles per hour for 24 seconds. How many yards did Larry run

    asked by Mal
  73. Social studies

    How did John browns raid at harpers ferry further increase sectionalism in the southern states

    asked by Kylie
  74. math

    t^3=64/27 what does t equal *must give answer in fraction with steps*

    asked by hi
  75. 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
  76. 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
  77. 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
  78. 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
  79. 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
  80. geography

    The one European country that did NOT establish settlements in North America was: Spain France Portugal England

    asked by Ryan
  81. 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
  82. 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
  83. 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
  84. 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
  85. ap lit

    What might Jackson be satirizing?

    asked by Anonymous
  86. Geography

    What is Mineral science

    asked by Malik
  87. 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
  88. 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
  89. science

    A ____, such as H2O4, is a symbol that shows the elements in a compound and the ratio of atoms.

    asked by oh no
  90. 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
  91. 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
  92. 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
  93. 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
  94. geometry

    A kite flying in the air has a 12-ft 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
  95. pre-algebra

    How do you find the surface area of a cylinder, and can you please give me the formula? -Hailey

    asked by Haliey
  96. 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
  97. 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
  98. 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
  99. Math

    Mountain View hotel’s employs 114 workers with a gross payroll of $91898 fringe benefits are 42.29 per employee

    asked by Yazmin
  100. 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