Popular questions and responses by alyssa
  1. physics

    the muzzle velocity of a 50.0g shell leaving a 3.00kg rifle is 400 m/s what is the recoil velocity of the rifle

    asked on December 16, 2012
  2. Pre-Calc

    I am really struggling with how to do these problems, I posted them a few minutes ago but the answers/work shown was incorrect. 1) a) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 12° cos

    asked on April 13, 2015
  3. History

    Which best describes the beginning of the American Revolutionary War? A. Great Britain and France declared war, known as the French and Indian War. B. American colonists fought the British at the Battles of Lexington and Concord. C. Great Britain signed

    asked on April 9, 2019
  4. Pre-Calc

    1) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 12° cos 18° − sin 12° sin 18° And Find its exact value. 2) Use an Addition or Subtraction Formula to write the expression as a

    asked on April 13, 2015
  5. Physics

    A 20.0 kg block is being pushed forward on a flat surface with a force of magnitude 45.0 N against a frictional force of 13.0 N. how would I find the change in kinetic energy after the force has pushed the block 4 meters? how much work would it take to

    asked on July 27, 2020
  6. Spanish

    I have to answer negatively. ¿Podemos ir a la playa o nadar en la piscina? I answered.. No, no podemos ir a la playa ni nadar en la piscina. But it says there is a word missing between podemos and ir. I tried.. No, no podemos no ir a la playa ni nadar en

    asked on March 16, 2017
  7. Algebra

    ) An inlet pipe can fill an empty tank in 5 hours by itself, and an outlet pipe can drain the same tank when full in 7 hours by itself. If the tank is two-thirds full when the valves for both pipes are opened, how many minutes will it take to fill the

    asked on December 1, 2016
  8. History

    Which most accurately describe humanist artistic innovations during the Renaissance? (Select all that apply.) Characters in medieval paintings were two-dimensional and unproportioned, while Renaissance paintings were lifelike and realistic. Nude paintings

    asked on March 22, 2019
  9. Math

    To study the efficiency of its new price-scanning equipment, a local supermarket monitored the amount of time its customers had to wait in line. The frequency distribution in the following table summarizes the findings. Find the standard deviation of the

    asked on April 15, 2017
  10. Chemistry

    net ionic equation to show that sulfurous acid, H2SO3, behaves as an acid in water. I got this answer but do not know if it is correct. H2SO3 + H2O --- H3O + SO I am Not sure if its is tri/mono/diprotic

    asked on April 30, 2017
  11. Chemistry

    Two moles of a nonelectrolyte solute are dissolved in 1 kg of an unknown solvent. The solution freezes at 7.8 degrees Celsius below its normal freezing point. What is the molal freezing point constant of the unknown solvent? What is your prediction for the

    asked on May 17, 2010
  12. Algebra 1

    Just checking my answers. What is the sum or difference? 1. 2x^4 - 8x^4 A. -6x^8 B. -6x^4*** C. -16x^4 D. -16x^8 What is the sum or difference 2. 10y^10 - 14y^10 A. -4y^20 B. -140y^20 C. -140y^10 D. -4y^10*** 3. Write the polynomial in standard form. Then

    asked on October 24, 2016
  13. Math

    A company did a quality check on all the packs of trail mix it manufactured. Each pack of trail mix is targeted to weigh 9.25 oz. A pack must weigh within 0.23 oz of the target weight to be accepted. What is the range of rejected masses, x, for the

    asked on October 28, 2017
  14. Chemistry

    Given that HSO4- is a stronger acid than HPO4^2-, what is the chemical reaction if solutions containing these ions are mixed together? (Hints: One of these must act as an acid and the other as a base. Use the Brønsted-Lowry definition) Please explain how

    asked on May 9, 2017
  15. Physics

    An object travels with a constant acceleration for 10 s. The vectors in Figure 3-41 represent the final and initial velocities. carefully graph the x component of the velocity versus time and the y component of the acceleration versus time, in a Vx vs t

    asked on September 11, 2015
  16. Calculus

    A) The point p(3,1) lies on the curve y= square root x-2. If Q is the point (x, square root x-2) use your calculator to find the slope of the decant line PQ for the following values of x 1) 2.5 2.) 2.9 3.) 2.99 4.) 2.999 5.) 3.5 6.) 3.1 7.) 3.01 8.) 3.001

    asked on September 6, 2019
  17. Math

    How many 1 inch squares can be cut from an 18"x24" piece of contruction paper

    asked on October 27, 2015
  18. Physics

    A circular conducting coil with radius 3.40 cm is placed in a uniform magnetic field of 1.090 T with the plane of the coil perpendicular to the magnetic field. The coil is rotated 180° about the axis in 0.222 s. (a) What is the average induced emf in the

    asked on February 17, 2013
  19. Nassau

    The length of the smaller rectangle at the right is 1 inch less than twice its width. Both the dimensions of the larger rectangle are 2 inches longer than the smaller rectangle. The area of the shaded region is 86 square inches. What is the area of the

    asked on August 4, 2011
  20. 9th grade chemistry

    Is the name for CuH2PO4 copper dihydrogen phosphate? I don't really understand the ones with the H2 in them... thanks

    asked on December 4, 2008
  21. College Physics Question

    The position of a ball as a function of time is given by x=(5.3m/s)t + (−11m/s^2)t^2 What would be the acceleration of the ball, and the velocity from t=0 to t=1s ?

    asked on September 17, 2017
  22. Science

    what geographical features create natural boundaries for water to flow toward one ocean or another?

    asked on September 21, 2016
  23. Physics

    A black mamba snake has a length of 4.3 m and a top speed of 8.9 m/s! Suppose a mongoose and a black mamba find themselves nose to nose. In an effort to escape, the snake accelerates at 20 m/s2 from rest. (a) How much time does it take for the snake to

    asked on August 29, 2015
  24. Physics

    Two resistors 10ohms and 5ohms are connected in parallel across a 15V battery. What is the potential difference across the 10ohms resistor. I do not need the answer just the formula and how to figure out the problem. Thanks.

    asked on August 3, 2014
  25. math

    The markup on a restaurant mean is 250%. A meal costs $7.25 to produce. How much will the customer be charged, after markup and 5% GST are applied?

    asked on July 4, 2013
  26. Physics

    Three point charges are on the x axis: −6 µC at −3 m, 7 µC at the origin, and −5 µC at 3 m. Find the force on the first charge. The value of the Coulomb constant is 8.98755 × 10^9 N · m^2/C^2.

    asked on January 15, 2013
  27. Calc 3

    Find the volume of the wedge-shaped region contained in the cylinder x^2 + y^2 = 1 and bounded above by the plane z = x and below by the xy-plane. The picture is a cylinder with a diagonal plane through it creating a wedge. Thanks! ;)

    asked on November 29, 2011
  28. calculus

    Suppose that the sales at Borders bookstores went from 70 million dollars in 1989 to 415 million dollars in 1993. What is the continuous percent growth rate, per year, of sales?

    asked on January 17, 2011
  29. Physics

    At t=0 a particle leaves the origin with a velocity of 5.0 m/s in the positive y direction, its acceleration is given by a=3i-2j m/s^2 At the instant the particle reaches its maximum y coordinate, how far is it from the origin? I'm not sure how to do a

    asked on October 17, 2015
  30. Physics

    A jet takes off from SFO (San Francisco, CA) and flies to YUL (Montréal, Quebec). The distance between the airports is 4100 km. After a 0.81-h layover, the jet returns to San Francisco. The total time for the round-trip (including the layover) is 13.9 h.

    asked on August 29, 2015
  31. Chemistry

    calculate the natural logarithm and reciprocal concentration at 0 seconds and NO2 concentration (M) of .8333 and at time 20 (seconds) and .4617 NO2 concentration (M)

    asked on July 22, 2013
  32. Math

    a farmer wants to fence in part of her land so that her chickens will have thier own little area. if she only has 28 feet of fence, what is the area of the largest pen that she can build?

    asked on June 7, 2012
  33. statistics

    A manufacturer of cell phones has decided that an assembly line will be considered to be operating satisfactorily if less than 0.02% of the phones produced per day are defective. To check the quality of a day's production, the company decides to randomly

    asked on February 22, 2012
  34. Writing

    can you use wanton in a sentence?

    asked on October 5, 2009
  35. Chemistry

    What is the formula for? Do you just take the charges so they can equal out to each oter? Silver (I)acetate silver (I) bromide

    asked on December 11, 2008
  36. calc

    find an equation of the line tangent to the circle (x-1)^2+(y-1)^2=25 at the point (4,-3) Can please someone explain this to me and show all work very confused

    asked on May 8, 2017
  37. algebra

    Combine like radical terms -7\sqrt(6-5 ) \sqrt(54)

    asked on May 4, 2017
  38. Algebra

    Joe and Skyler can clean an entire building in 44 hours. Joe can clean the entire building by himself in 66 fewer hours than Skyler can. How long does it take Joe to clean the building by​ himself?

    asked on February 21, 2017
  39. Math

    Which is the greater amount of money, 120% of 0.3% of $1000 or 120.3% of $1000?

    asked on October 21, 2016
  40. Math

    A rectangle has a width of 5 meters and length of 14 meters. If a similar rectangle has a width of 15 meters, what's its perimeter, in meters?

    asked on May 10, 2016
  41. Physics

    (a) Estimate the positive charge in you due to the protons in the molecules present in your body. (Assume that the human body is made entirely out of water.) (b) What is the net charge in your body?

    asked on January 29, 2016
  42. Physics

    An object travels with a constant acceleration for 10 s. The vectors in Figure 3-41 represent the final and initial velocities. carefully graph the x component of the velocity versus time, the y component of the velocity versus time and the y component of

    asked on September 11, 2015
  43. math

    Find the simple interest and the final value of the deposit that earns the given rate for the indicated length of time. Round your answers to the nearest cent. $8439 earning 8% for 1.4 years ?

    asked on August 5, 2015
  44. math

    If you roll a pair of number cubes 50 times, what would be the experimental probability of P(odd and odd)

    asked on May 4, 2015
  45. Physics

    Analyze the flight of a projectile moving under the influence of gravity (mg) and linear, i.e., laminar- flow drag (fD = bv, with b > 0 constant). Neglect \Phase I"; assume the projectile is launched from the origin at speed v1 and angle 1 above the

    asked on March 2, 2015
  46. Math

    !!PLEASE SHOW YOUR WORK!! My recipe makes 96 cookies, but I'll only need 24 for the party, what will I multiply each ingredient by to make just 24 cookies? Explain.

    asked on January 21, 2015
  47. AP Calculus

    In the answer space below, provide the larger of the two positive integers that add up to 60 and have the largest possible product.

    asked on October 16, 2014
  48. Science

    why is burning magnesium an irreversible reaction?

    asked on October 3, 2014
  49. Government

    Homework Help Powers that are shared by both the National Government and the States are called... A) reserved powers B) enumerated powers C) inherent powers D) implied powers E) concurrent powers The Supreme Court carries out most of the country's

    asked on June 26, 2013
  50. Algebra

    LCD of x/x2+3x , 2x/x2-3x

    asked on January 27, 2013
  51. physics

    The planetMars requires 2.35 years to orbit the sun, which has a mass of 2 × 1030 kg, in an almost circular trajectory. Find the radius of the orbit of Mars as it circles the sun. The gravitational constant is 6.672 × 10−11 N · m2/kg2 . Answer in

    asked on November 8, 2012
  52. physics

    A wagon is pulled by a handle making an upward angle of 25° with a force of 25 N. What is the horizontal force pulling the wagon foward? What is the force lifting the wagon off the road?

    asked on November 3, 2012
  53. 7th grade math

    solve for k -4k-8k+7=-53 Please explain how you found your answer!! Please help!!

    asked on August 8, 2012
  54. 5TH grade math

    estimate each sum or differnce. 7.4 + 3.1+ 9.8 How do I do this?

    asked on August 25, 2011
  55. MATH GRADE 10****

    Scott, Arif, and Diane run a small delivery company. For thier business, they use licensed two-way radios with a 20 km range. Scott is at their office which they have marked as the origin on their map of the town. Arif is dropping off a package at (-8, 16)

    asked on December 25, 2009
  56. grammar

    as the title of a song, which is correct; "I've Learned From You" "I've Learned from you" "I've Learned From you" "I've Leared from You"

    asked on September 28, 2009
  57. Science

    Grasshoppers generally have the colour as their background. What would be the problem with using the mark/release/recapture method to estimate the size of a population of grasshoppers if you marked them with bright red mark.

    asked on September 28, 2009
  58. math

    A two-digit locker combination is made up of non-zero digits and no digit is repeated in any combination. Event A = the first digit is 4 Event B = the second digit is odd If a combination is chosen at random with each possible locker combination being

    asked on April 19, 2020
  59. Math

    If Maria earned $60 in interest over a 4-year period at a 4% simple annual interest rate, how much did she originally deposit in savings?

    asked on March 25, 2020
  60. Chemistry

    Chlorous acid reacts with ammonium chromate. How do I balance this?

    asked on January 7, 2020
  61. History

    Which accurately describes Isaac Newton’s clockwork universe theory? A. It compares the universe to a mechanical clock wound up by God, with its gears governed by the laws of physics. B. It compares the universe to London’s Big Ben clock tower,

    asked on April 8, 2019
  62. Math

    lucky drew an isosceles triangle as shown if the measures of XYZ is 25 what is the measure of XYZ

    asked on February 14, 2017
  63. Language arts

    What is the name of the online textbook used in this course A) Language arts B) The big question C) Literature D) Write to learn

    asked on January 25, 2017
  64. Government and politics

    Explain 2 enumerated powers of the president and 2 enumerated powers of congress

    asked on November 3, 2016
  65. chemistry

    A student conducts a reaction and measures a 19.9 g yield. The theoretical yield of the reaction under the conditions used is 31.4 grams. What percent yield did the student achieve?

    asked on November 2, 2016
  66. math

    the number of trucks crossing the border fell from 3240 to 2673. What is the percent decrease?

    asked on November 2, 2016
  67. Physics

    Estimate the increase in rest energy of a copper sample [100 kg, c = 387 J/(kg · °C)] if its temperature is increased 100°C. -answer needs to be in kg please.

    asked on May 13, 2016
  68. Math

    On the ruler below, identify the location of 7 3 -- 8

    asked on March 8, 2016
  69. Physics

    A 500 g sample of gold heated to 971.0 deg. C is placed in a calorimeter containing 220 g of water initially at 20.0 deg. C. If no heat is lost to the surrounding environment what will the final temperature of the water be? [HINT: At the end, the sample

    asked on February 16, 2016
  70. Physics

    A cylinderical brass rod with a radius of 2.10 cm and length of 1.50 m is placed in a fire with temperature of 490 deg. C. If the other end of the rod is at a temperature of 33 deg. C, what is the rate of heat transfer through the rod (ignore any heat loss

    asked on February 15, 2016
  71. Physics

    A styrofoam cooler is a cube with side length of 20.0 cm and walls with thickness of 1.9 cm. If the external temperature is 27.0 deg. C and the cooler contains ice and water at 0 deg. C. How much heat is transferred into the box in 24 hours? - I got

    asked on February 15, 2016
  72. Algebra

    A colony of bacteria has a population of ten initially, and doubles in size every three hours. What is the population of the colony after 24 hours of growth ?

    asked on January 24, 2016
  73. science

    I have a question from an old exam that I need help to understand, i'm not sure where to start An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a photon. The photon

    asked on October 16, 2015
  74. Algebra

    a). The length of the classroom is 30 ft. The length of the room on the scale drawing is 6 in. Is this correct? Explain why or why not. Michael has made a scale drawing of his classroom. The scale for his drawing is 0.5 in. : 3 ft. b). One of the student

    asked on October 4, 2015
  75. grammar

    Which best describes the underlined group of words? Then it was time for Karla, my sister's best friend, to fly home. my sisters best friend is underlined A. adverb phrase B. misplaced modifier C. appositive phrase D. adjective phrase i think its c

    asked on May 28, 2015
  76. Math

    Is this independent or not. Carlos tosses a coin that comes up heads. Jennifer tosses a coin that also come up heads.

    asked on May 9, 2015
  77. Math

    Math: Is this statement independent or not. Jordan stayed up late last night watching television. Jordan did poorly in his quiz in the morning.

    asked on May 9, 2015
  78. chemistry

    I need an example of an elementary reaction to go with the definition An elementary reaction is a reaction in which reactants are converted to products in a single step.

    asked on March 16, 2015
  79. algebra

    Ed Moura has $21000 invested in stocks paying 8%. How much additional money should he invest in certificates of deposit paying 4% so that the average return on the two investments is 5%?

    asked on March 12, 2015
  80. chemistry

    In the reaction O2+2NO->2NO2 what is the ratio of oxygen reacted to nitrogen dioxide produced? Nitrogen monoxide to nitrogen dioxide? We had to calculate the concentration of each, for which I have O2=-1.01x10^-5, NO=-2.03x10^-5 and NO2=2.04x10^-5. I'm not

    asked on March 12, 2015
  81. chemistry

    if the concentration of all the reactants doubled, what works happen to the rate I know the reaction rate would increase, but in a previous example it asked the question and the answer was that the rate increases by 16 and I can't figure out how much it

    asked on March 10, 2015
  82. chemistry

    What pairs of ions produce similar colours in the flame test? Use your periodic table of elements to explain the reason for this. The pairs with similar colours were Ba2+ and Cu2+, and Sr2+ and Li+. Ba and Cu had light green-ish colours, and Sr and Li had

    asked on February 17, 2015
  83. math

    Sin theta equals 5/12 in quadrant, find the exact value of cos 2theta. I'm not sure how to solve this question, I need some help.

    asked on January 16, 2015
  84. math

    rodeo performer spins a lasso in a circle perpendicular to the ground. the circle has a diameter of 118cm. she starts with the knot at the lowest point which is at 90 cm above the ground, she spins the lasso and .5 seconds later the knot is at the highest

    asked on January 16, 2015
  85. AP Calculus

    If 600 cm2 of material is available to make a box with a square base and a closed top, find the maximum volume of the box in cubic centimeters. Answer to the nearest cubic centimeter without commas. For example, if the answer is 2,000 write 2000.

    asked on October 16, 2014
  86. Chemistry

    -Describe the zero sum rule -True of False: The formula for the nitride ion is N^(-3) -True of False: The stock system shows the charge on the negative ion

    asked on October 1, 2014
  87. Chemistry

    Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more compli- cated, but this is a reasonable first approxima- tion.) The combustion of carbon is described by the equation C(s) + O2(g) −→ CO2(g) ∆H◦ = −394 kJ What is

    asked on May 22, 2014
  88. Chemistry

    Calculate the volume of NaOH 0.5 mol/L necessary to neutralize 300 mL of HCl 0.2 M. na= how do I calculate this? Ma= 0.2 M Va= 0.300 L nb= 0.5 mol Mb= 0.5 M Vb= ?

    asked on May 13, 2014
  89. History

    Mark the statement if it describes Roman society during the time of Cincinnatus. A. Rome’s government was based on law in which many people had a voice. B. Rome was being surrounded and threatened by outside forces. C. People in Rome admired those who

    asked on April 23, 2014
  90. algebra 2

    So I am doing my algebra home work and I get stuck on these three problems. x^2-19x+72 from there idk what to do because nothing multiplies up to 72 and adds up to -19. Same for this one. x^2-25x+48 And x^2+9-90 (X+15) (x-6)

    asked on November 10, 2013
  91. socials 11

    why was the issue of West Coast salmon such a controversial issue?

    asked on July 23, 2013
  92. socials 11

    what do you think is the best solution for Canada's current healthcare predicaments?

    asked on July 23, 2013
  93. socials 11

    why did canada's ties with cuba, in particular, represent a move away from adherence to american foreign policy?

    asked on July 21, 2013
  94. socials 11 (the beginning of the cold war)

    in what sense did the concept of MAD keep both sides from going to war?

    asked on July 17, 2013
  95. 4 grade math

    Find two mixed numbers so that the sum is 15 3/10 and the difference is 8 5/10

    asked on May 21, 2013
  96. math

    Charles mixed pineapple juice and orange juice to make a fruit punch. He made a total of 5 1/2 cups of the mixture and used 2 more cups of orange juice than pineapple juice. How much did he use of each type of juice?

    asked on February 12, 2013
  97. statistics

    Scores on the ACT college entrance exam are Normally distributed with a mean µ = 20 and standard deviation σ = 5. An SRS of 25 ACT scores is selected, construct a 95% Confidence Interval for the sample mean (X-Bar) and interpret your result.

    asked on December 3, 2012
  98. Pre Calc

    how much money should i invest at 8.2% compounded continuously if i wish to have $100,000 in 5 years?

    asked on November 8, 2012
  99. english

    what is the order of imortance? whoever answers this gets to meet my mom the mayor!!!!!!!!!!!!!!!!!!!!

    asked on October 23, 2012
  100. chemistry

    When 47.5J of heat are added to 13.2 g of liquid, its temperature rises by 1.72 degrees C. What is the heat capacity of the liquid? A cook wants to heat 1.35kg of water from 32.0 degrees C to 100 degrees C. If he uses combustion of natural gas to heat the

    asked on September 21, 2012


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