Questions Asked on
March 3, 2017

  1. physics help please

    A double-slit experiment is performed with light from a Helium Neon Laser on two slits 80 micrometers apart. The first bright interference fringe left of the center is spaced 2m from the bright center. How far away from the double slit is the screen?

    asked by kailey
  2. biology

    why does the knee jerk reflex still work for people who have spinal cord injuries?

    asked by homework
  3. Maths

    How many cubes of edge 1/2cm are required to build a cube of side 3cm

    asked by Anonymous
  4. Maths

    How many cubes of edge 1/2cm are required to build a cube of side 3cm

    asked by Anonymous
  5. Maths

    How many cubes of edge 1/2cm are required to build a cube of side 3cm

    asked by Anonymous
  6. calc

    If f is the focal length of a convex lens and an object is placed at a distance p from the lens, then its image will be at a distance q from the lens, where f, p, and q are related by the lens equation 1f=1p+1q What is the rate of change of p with respect

    asked by hanna
  7. social studies... help!!

    my answers are the ones with the stars.. please help. 8.The 54th Massachusetts Regiment is famous because: a. It helped win the Mexican-American War ***b. It was a famous Confederate army unit noted for its heroism in battle c. It was an African American

    asked by kitty15
  8. rift vally universtiy

    prove the profit maximaization of the consume i.e mu=p, according tocardinalist using mathmaticale derivation

    asked by Anonymous
  9. physics

    A 60kg boy climbs 70 fligts of stairs each 20cm high in one minute how much powers is developed?

    asked by physics
  10. rift vally universtiy

    Expain the profit maximation codition of plant monoplist

    asked by Anonymous
  11. calculus

    dt/dx= ((x^2+a^2)^(1/2))/v1+((b^2+d^2)^(1/2))/v1 the function dt/dx has a zero at a unique x on (0,d). Use this to justify your discovery that d= (x^2+a^2)^(1/2) + (b^2+d^2)^(1/2)

    asked by melina
  12. maths trigonometry

    solve the equation (cos theta +1)(tan theta minus 1)=0 for solution between 0 and 2pii.

    asked by lughano
  13. Maths

    Allan buys a used car for his daughter by paying a 20% deposit and $275 per month for 4 years. If the car has a cash price of $10 400, find the flat interest rate (p.a.) correct to one decimal place. I got 14.7% but the answers say 58.7 could someone

    asked by Maddie
  14. maths trigonometry

    solve the equation (2cos theta +1)(tan theta minus 1)=0 for all values between 0 and 2pii.

    asked by lughano
  15. maths trigonometry,

    find all solutions between 0 and 2pii for (tan theta =1)and (cos theta =negative 1/2).

    asked by lughano
  16. Math - Linear Approximation

    I have a follow-up question from a problem I posted earlier: Approximate sin(61π/360): So, sin(60π/360 + π/360) = sin(π/6 + (π/360)) Now the equation for linear approximation is f(x+a)=f(a)+f'(a)(x-a). To get the right answer, that means plugging in

    asked by Jamie
  17. Math

    Find the dimensions of a right triangle that maximizes the area when the perimeter is 10 cm

    asked by Anonymous
  18. Statistics

    A manufacturer estimates that when x units of a particular commodity are produced each month, the total cost (in dollars) will be C(x) = 1/8x^2+4x+200 and all units can be sold at a price of p(x) = 49 - x dollars per unit. Determine the price that

    asked by Jack
  19. Stast

    Mean=15.854, Median=15.99, Mode=16.21, SD=0.661381 1) what is the probability that a randomly chosen bottle will contain 16 ounces of soda? 0.22075, 0.587357 2)What is the value of soda associated with a Zscore of -1.5

    asked by MM
  20. math

    A flower displays contains tulips, roses, and carnations. For every 10 tulips, there are 4 roses and 6 carnation. The display contains 100 flowers. How many of the flowers are tulips?

    asked by Ken
  21. Science

    A uniform have metre rule,pivoted at 20cm mark balances horizontally when a mass of 50g is suspended from 4cm mark calculate the mass of the metre rule.

    asked by Francis
  22. Statistics

    A basket ball player makes 70% of her free throws. She takes 7 free throws in a game, and makes 5 of her 7 throws. If the shots are independent of each other, Then what is the probability that she makes the first five and misses the last 2?

    asked by Niki
  23. chemistry

    For the reaction 2Na(s)+Cl2(g)→2NaCl(s)2Na(s)+Cl2(g)→2NaCl(s), how many grams of NaCl could be produced from 20 L of Cl2Cl2 (at STP)?

    asked by dave
  24. Science

    1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer.  I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper.  2. A bucket of paint

    asked by David
  25. Rpcc

    You throw a ball horizontally off a building with a horontal velocity of 10 m/s. What is the ball's horontal velocity 5 seconds later? What is the ball's vertical velocity 5 seconds later?

    asked by Angie
  26. Math

    Alberto is painting a large triangle on one wall of his bedroom the base of the triangle is 4ft and height is 8ft it takes 0.2 quart of paint to cover 1 square foot

    asked by Gaby
  27. Social studies

    Compare the experience of farmers,coal miners,and union labores during the 1920s. What did many have in common? 1.Economic prosperity 2. Public disapproval 3. Federal assistance 4. Financial hardship I choose A is it correct Ms. Sue

    asked by Mel
  28. Chemestry

    Prove basics radical?

    asked by Science
  29. Math! Help Hurry!

    Two vertices of a right triangle have the coordinates (−2, 5) and (9, 5) . What is the length of the side formed by these vertices?

    asked by JT
  30. physics

    Determine the ionization energy required to extract the electron totally out of a hydrogen atom, and put it at rest

    asked by vicky
  31. Math help plz?!!

    Enter the value of arcsin(0.89) as a decimal to the nearest hundredth of a degree in the box. The answer I got was 1.097º

    asked by Tete
  32. maths

    a man sells two tables at the same price. On one he makes profit of 10% and on other he suffers a loss of 10 %.Find his loss or gain percent on the whole transaction

    asked by yash
  33. Social Studies

    what industries did fishing help to grow in the 1800s

    asked by Plz Answer
  34. Struggling on math please help :(

    What is a positive coterminal angle to 47° that is between 500° and 1000° and a negative coterminal angle to 47° that is between −500° and 0°? I don't really understand how to do this >.

    asked by Kaylee
  35. Math

    If Leah walks 5 miles in 60 minutes, then Leah will walk how far in 110 minutes if she walks at the same speed the whole time? If necessary, round your answer to the nearest tenth of a mile.

    asked by Brandon
  36. math

    A cab company charges $2 per cab ride, plus an additional $2 per mile driven. If a cab ride is 7 miles long, how much will it cost?

    asked by johnny depp
  37. ed tech

    which of the following strategies might be useful when organizing items in your study area

    asked by nessa
  38. Technical writing

    Which is the correct comparative form of easy? Select one: a. easiest b. more easy c. easier d. easyer C

    asked by Michelle
  39. Math

    In Portland, the tax on a property assessed at $590,000 is $6,490. If tax rates are proportional in this city, how much would the tax be on a property assessed at $710,000?

    asked by Brandon
  40. maths

    calculate the surface area of a sphere of which the volume is 9000mm^3

    asked by Anonymous
  41. Hcpcs

    J codes do not include drug_____. Amount?

    asked by Michelle
  42. Physics

    Three resistors are connected in series across a battery. The value of each resistance and its maximum power rating are as follows: 7.1Ω and 20.9 W, 29.5Ω and 11.4 W, and 13.6Ω and 12.5 W. (a) What is the greatest voltage that the battery can have

    asked by Brooke
  43. Physics

    A(n) 0.34 kg soccer ball approaches a player horizontally with a speed of 6.18 m/s. The player illegally strikes the ball with her hand and causes it to move in the opposite direction with a speed of 31.3 m/s . What is the magnitude of the impulse de-

    asked by Kiera
  44. Physics

    Scenario : A truck has a mass of 2000kg and is moving at 50m/s and collides with another truck that has a mass of 2000kg moving at a speed of -20m/s. 1)Is this a sticky or springy collision? 2)What is the total momentum after the collision? 3)If both

    asked by Suzy
  45. Math

    What criterias do two graphs have to meet in order to be isomorphic? I know they must have the same number of vertices and edges. Do they both have to be bipartite/non-bipartite?

    asked by Winston
  46. physics 11

    a canon is shot horizontally at 15 m/s off a cliff, which is 36m above water. how far away from the cliff should the target enemy boat be when the canon is shot?

    asked by sumal
  47. CHEMISTRY

    *Consider a 0.15 m strontium chloride aqueous solution. a. Determine the molality (in m) of all solutes in the solution. Assume that strontium chloride completely ionizes when dissolved in water. All solutes means all cations and anions. The molality that

    asked by JENNIFER
  48. physics 11

    a water bomber flying with a horizontal speed of 85m/s at a height of 3000 m drops a load on a fire below. how far in front of the target fire should the load be released?

    asked by sumal
  49. Physic

    A force of 7000N is applied to drag a 500 kg cow across a flat level floor to McSlaughter House. The cow has an acceleration of 2.5 m/s2. (a) what's the weight of the cow? (b) what is the normal force acting on the cow? (c) What is the resultant force that

    asked by Elaine
  50. language arts

    In both "Miracles" and "in Just—," the poets use images that appeal to the senses. In a paragraph, compare the use of imagery in the two poems. First, present images in each poem that appeal to the senses of sight, sound, and touch. Then, state at

    asked by Anonymous
  51. maths binomial expansion

    find five term of the expansion (x+y/2)^1/3 show step plz

    asked by paluto
  52. Writiing Skills

    As a result, although the swimming or boating may be great, you will have to get up at daybreak to beat the crowds. If rewrote the sentence As a result, although the swimming or boating may be great, the next word should be a) since b) but c) and d) if e)

    asked by Sandra
  53. Science

    1. granite lasts a long time when it is used for building in areas where

    asked by Help12
  54. Chemistry

    At what temperature will 0.0100 mole of argon gas have a volume of 275 mL at 100.0 kPa?

    asked by Utah
  55. Physics

    p = mv Scenario #4 At a station ,a train weighs approximately 1000kg and is moving at 50m/s on a railway and collides with an incoming train weighing 1000kg and moving at -20m/s. 1)If these two trains stick together and begin to move after having being

    asked by Cheryl
  56. American Government

    Consider the expressed, nonlegislative powers related to patents and copyrights. Why did the Founding Fathers include these ideas in the expressed powers of Congress? How have patents and copyrights contributed to U.S. history and identity? I have no idea

    asked by Brighton
  57. Physic

    A 25 kg box is set on a flat surface with us=0.62 and uk=0.49. A force of 100N is applied to the box through a rope which makes and angle of 30 degrees with the horizon. (a)what's the component of Fa that is attempting to move the box sideways? (b) what's

    asked by Elaine
  58. Essentials og Psychology

    The science of the mind questions please for Penn foster. No need of answers. Please help.

    asked by A student
  59. Math

    I need to describe a situation that's linear and nonlinear, but I'm not sure how. Can someone explain, or give an example?

    asked by EmberShy
  60. Statistics Maths

    Iam confused by this and need some help not sure if I am right about this = 3000-7.3x x 50 = 2635 regression equation: number of tickets = 3000 - 7.3x, where x = ticket price. If Yoncebé prices the tickets at $50, how many tickets is she predicted to

    asked by claire
  61. Calculus AP Exam review explanation pls

    1)What is the area bounded by y = x^2 and y =3x? A)5 B)9/2 ***C)8 D)11.2 E)25 i believe it to be 8 but im not sure. 2)The region R is bounded by the x-axis, x = 2, and y = x^2. Which of these expressions represents the volume of the solid formed by

    asked by ReviewDay :(
  62. Math

    The Mall: My sister likes to go shopping. Yesterday she borrowed a wad of money from Mom and went to the mall. She began her excursion by spending $18 on a new CD. Then she spent half her remaining money on a new dress. Then she spent $11 on lunch. Then

    asked by Ali
  63. writing

    What else can they do when repaired walls separate from beams or restoring sockets carry no electricity What correction should be made to this sentence? 1) Insert a comma after walls 2) change the spelling of separate to seperate 3) Change restoring to

    asked by Sandra
  64. Math- Formulas

    What are some formulas that you use in everyday life and how do you use them? I already wrote about volume but I need some other ideas.

    asked by Anonymous
  65. Mathematics

    If 4 painters can paint 3 rooms in 12 hours, how long will it take for: a) 1 painter to paint 3 rooms? b) 1 painter to paint 1 room? c) 4 painters to paint 1 room? d) 2 painters to paint 6 rooms

    asked by Terrie
  66. Algebra 2

    If the slope turns out to be 4/0 in an equation them is it undefined. Also, therefore, would the y intercept not be able to be determined or can it be determined?

    asked by Mathew
  67. Algebra

    1. which solid has two bases that are triangles and three lateral surfaces that are rectangles a. triangular pyramid b. rectangular prism c. triangular prism *** d. rectangular pyramid 2. a solid with two parallel and congruent bases cannot be which of the

    asked by nunia
  68. math

    To make green paint, Tyler mixes 14 ounces of yellow paint with 10 ounces of blue paint.How many ounces of yellow paint are there per ounce of blue paint?

    asked by Kurbria
  69. MATHEMATICS

    What is the slope of the line that passes through (2, 5) and (−1, 5)? A. Undefined B. 0 I think its 0

    asked by Brooke
  70. Algebra

    Zeroes at 1±sqrt(2) ,y-intercept at –4 f(x)=?

    asked by Anonymous
  71. Algebra

    f(2)=f(4)=0, f(3)=−2. f(x)=?

    asked by Anonymous
  72. chemistry

    In an experiment designed to determine the concentration of Cu+2 ions in an unknown solution, you need to prepare 100 mL of 0.10 M CuSO4 as your stock solution. How many grams of CuSO4(s) should you use?

    asked by Jessie
  73. chemistry

    You measure out 3.00 mL of 0.100 M Co(NO3)2, place it in a test tube and add 7.00 mL of water. What is the concentration of the diluted solution in the test tube?

    asked by Jessie
  74. English

    1. What is he wearing on his head? -He is wearing a wig? 2. What is he wearing on his upper body? - He is wearing a T-shirt. 3. What is she wering on her feet? - She is wearing sandals. -------------------------------- We can divide our body into three

    asked by rfvv
  75. Algebra

    A clock's minute hand moves 60 grade in 10 minutes and 180 grade in 30 minutes low far does it move from 11:00 to 11:40? What is the problem asking you to find? The measure of the angle on a clock from What do you need to know to solve the problem? What is

    asked by Marina
  76. Calculus

    Write an expression for y = f(x) by solving the differential equation dy/dx = x√y with the initial condition f(3) = 25. I got y = (x^2/4 + 11/4)^2.

    asked by Anonymous
  77. English

    1. Jenny's friends're not angry. 2. Your friends're generous. (Are the contractions grammatical?) 3. Middle school is not the same as elementary school. 4. Middle school is not the same as elementary school is the same. (Does #3 mean #4? Is #4 the full

    asked by rfvv
  78. math

    Peter played his favorite video game for 10 hours last week. Today, Peter's parents restricted him to 5 additional hours each week for the next 8 weeks. Create the function, f(x), that models Peter's total video game time? Is it f(x)=5x + 10 or f(x)=5x + 8

    asked by Brooke
  79. Calculus

    Consider the differential equation dy/dx = x^4(y - 2). Find the particular solution y = f(x) to the given differential equation with the initial condition f(0) = 0. Is this y=e^(x^5/5)+4?

    asked by Anonymous
  80. Database Design and Programming

    Assignment Problem. Given the following functional requirements description of the following application, produce an ERD model based on the Crow’s Foot model—that can be implemented. Show all entities, relationships, optionalities, connectivities, and

    asked by Rossy
  81. math

    2. Write the decimal 0.063 as a percent. a) 0.63% b) 6.3%

    asked by check pleaseee
  82. physics

    In which of the following situations is the most work done on the object? A. Holding a 50 kg object. B. Carrying a 30 kg object down a 40 m long hallway. C. Lifting a 20 kg object 1 m up. D. Carrying a 15 kg object up a flight of stairs. E. Lowering a 25

    asked by dali
  83. physics

    Which quantity and unit are INCORRECTLY paired? A. Quantity: F Unit: kg m/s B. Quantity: J Unit: N·s C. Quantity: W Unit: J D. Quantity: P Unit: W E. Quantity: E Unit: kg m2/s2

    asked by dali
  84. physics

    A 10-kg mass is moving at a speed of 4.0 m/s. How much work is required to stop the mass? A. 20 J B. 40 J C. 60 J D. 80 J E. 100 J

    asked by dali
  85. physics

    At what rate is a 60.0-kg boy using energy when he sprints up a flight of stairs 10.0 m high in 8.00 s? A. 75.0 W B. 48.0 W C. 735 W D. 480 W E. 4.80 kW

    asked by dali
  86. physics

    Mass M1 has twice the mass of M2. M1 and M2 are raised from a height of 5 m to 25 m, and from 14 m to 24 m, respectively. What is the ratio of work done on mass M1 to that done on mass M2? A. 1 : 4 B. 25 : 12 C. 4 : 1 D. 2 : 1 E. 5 : 1

    asked by dali
  87. physics

    Object A of mass M is released from height H, whereas object B of mass 0.5M is released from height 2H. What is the ratio of the velocity of object A to that of object B immediately before they hit the ground? A. 1 : 2 B. 1.41 : 1 C. 1 : 1.41 D. 1 : 4 E. 1

    asked by dali
  88. calculus

    A cable hangs between two poles of equal height and 40 feet apart. At a point on the ground directly under the cable and x feet from the point on the ground halfway between the poles the height of the cable in feet is h(x) = 10+(0.1)*(x^1.5). The cable

    asked by maggie
  89. CIS

    Assume you have a computer that contains 1 GB of memory. It contains 4 memory slots. Each slot can contain on of the following memory modules: 128 MB, 246 MB, 512 MB, 1GB or 2 GB. Two of the slots are currently used, each contain a 512 MB memory module.

    asked by RUBY
  90. math

    (a) Mr. Smith divides a sum of money between his three children Alex, Billy and Charlie in the ratio 3 : 2 : 7. If Charlie received $120 more than Alex, how much money did Billy receive?

    asked by xyz
  91. math

    I am a secret number with 4 in the ones place a 6 in the tenths place . Who am I ?

    asked by waleed
  92. math

    (b) If I give you $40 then the ratio of my money to yours is 4 : 5. On the other hand, if you give me $40, then the ratio is 8 : 1. How much money do both of us have?

    asked by xyz
  93. math

    The ratio of Jim’s money to Peter’s money was 4 : 7 at first. After Jim spent half of his money and Peter spent $60, Peter had twice as much money as Jim. How much money did Jim have at first?

    asked by xyz
  94. math

    You bought two varieties of rice, costing 5 cents per ounce and 6 cents per ounce each, and mixed them in some ratio. You then sold the mixture at 7 cents per ounce, making a profit of 20 percent. What was the ratio of the mixture?

    asked by xyz
  95. math

    The ratio of marks obtained by Ashpreet and Bhupinder on an exam is 6 : 5. If the combined average of their percentage scores is 68.75%, and the sum of their marks is 275, what was the exam out of?

    asked by xyz
  96. math

    If x : y = a : b, prove that x : y : (x + y) = a : b : (a + b)

    asked by xyz
  97. math

    think of a number. Triple it. Add 100. double the result. Add 100. divide the result by 4. subtract one a half time the original number. What is the result?

    asked by roy
  98. math

    points] Two alloys A1 and A2 are composed of two basic elements. The ratios of the compositions of the two basic elements in A1 and A2 are 5 : 3 and 1 : 2, respectively. A new alloy is formed by mixing the two alloys A1 and A2 in the ratio 4 : 3. What is

    asked by xyz
  99. math

    AB is a chord of a circle with center O, C is the midpoint of the chord AB, extend OC to the point D on the circle. If OC=CD, what is the measure of angle AOB? 90 100 120 60

    asked by asx
  100. Chemistry

    A 25-mL sample of 0.160M solution of NaOH is titrated with 17 mL of an unknown solution of H2SO4 What is the morality of the sulfuric acid solution.

    asked by Angela
  101. Science

    18. The description of the structure of the atom is called the ___. ATOMIC MODEL 19. In a water molecule, two atoms of hydrogen and one atom of oxygen share electrons. A ______ bond is found in a water molecule. COVALENT BOND 20. Sodium chloride is formed

    asked by Amy@@