Popular questions and responses by Ellie
  1. Pre-Calculus HELP!

    change the polar equation r=5/1+cos(theta) to rectangular form. How do I do this? Thank you! :)

    asked on September 6, 2015
  2. earth science

    can someone please help me? Having studied the data for patterns and trends, you should now be able to draw some conclusions about how knowing the half-life of the element Lokium would help you determine the absolute age of rock in which this element is

    asked on August 13, 2019
  3. Physics

    At what rate will a pendulum clock run on the Moon, where the acceleration due to gravity is 1.63 m/s2 , if it keeps time accurately on Earth? That is, find the time (in hours) it takes the clock’s hour hand to make one revolution on the Moon. provide

    asked on February 4, 2013
  4. Language Arts

    From an hour with Abuelo: which paragraphs represent the exposition in Abuelo's story? paragraphs 8–10 paragraphs 10–12 paragraphs 12–14 paragraphs 14–15 *** (i chose number 4)14-15

    asked on November 13, 2015
  5. chemistry

    hello i am having trouble writing these two ionic equations. could someone explain to me how to do that? 1.)K2SO4(aq) and Na2CO3(aq).Write the ionic equation. 2.)RbCl(aq) and KOH(aq).Write the ionic equation.

    asked on November 4, 2013
  6. ELA

    What is the best summary of the speakers basic message in Annabel Lee? I am heartbroken and I will never stop loving annabel lee.* Annabel Lee and I were friends from the time we were children. I am heartbroken I will and I will get revenge for Annabel

    asked on February 27, 2017
  7. math- HELP!

    The value of a particular investment follows a pattern of exponential growth. You invested money in a money market account. The value of your investment t years after your initial investment is given by the exponential growth model A=2600e^0.08t How much

    asked on January 2, 2016
  8. Astronomy

    Imagine that the asteroid A that has an escape velocity of 50m/s. If asteroid B has twice the mass and twice the radius it would have an escape velocity _______ the escape velocity of asteroid A

    asked on March 26, 2015
  9. Precalculus

    I have two questions: 1. You want to make an investment in a continuously compounding account earning 18% interest. How many years will it take for your investment to double in value? Round the logarithm value to the nearest thousandth. Round the answer to

    asked on November 1, 2015
  10. Pre-Calculus HELP!!

    The length of a day in Philadelphia, Pennsylvania, is given by the sinusoidal function, f(t), which represents the number of hours of daylight t days into the year: f(x)=11+2.2sin(2pi/365)t-1.25).How many hours of daylight are there on the twelfth day of

    asked on November 26, 2015
  11. Chemistry

    Given the following heats of combustion. CH3OH(l) + 3/2 O2(g) CO2(g) + 2 H2O(l) ΔH°rxn = -726.4 kJ C(graphite) + O2(g) CO2(g) ΔH°rxn = -393.5 kJ H2(g) + 1/2 O2(g) H2O(l) ΔH°rxn = -285.8 kJ Calculate the enthalpy of formation of methanol (CH3OH) from

    asked on September 18, 2011
  12. college chemistry

    calculate the average kinetic energies of CH4 and N2 molecules at 273k and 546k

    asked on January 20, 2015
  13. Social Studies

    Discuss the social reforms that shaped the nation in the 1800s. What do you think have been the lasting impacts of the Reform Era? How do these reforms influence society today? What do you think were the most important social reforms and why?

    asked on November 29, 2016
  14. Physics

    Consider the Bohr energy expression (Equation 30.13) as it applies to singly ionized helium He+ (Z = 2) and an ionized atom with Z=4 and only a single electron orbiting the nucleus. This expression predicts equal electron energies for these two species for

    asked on September 30, 2016
  15. Trigonometry- Help!

    After one hour in flight, an airplane is located 200 miles north and 300 miles west of the airport. What is the magnitude of the plane's velocity? Round your answer to the nearest mile per hour. a) 22 miles per hour b) 128 miles per hour c )256 miles per

    asked on December 17, 2015
  16. art social studies

    Which of the following did the development of linear perspective allow artists to do?

    asked on January 20, 2019
  17. chemistry

    what is the standard enthalpy formation of liquid diethylamine (CH3CH2)2 NH? N2O5(g) + 8CH4(g) ==> 2(CH3CH2)2NH(l) +5H2O(l), delta H= -1103kJ

    asked on June 21, 2010
  18. Precalculus- HELP!

    The temperature in your house is controlled by a thermostat. The temperatures will vary according to the sinusoidal function: f(x)=7sin(π/12(x-11))+33 where f(x) represents the temperature in degrees Celsius (°C) and x is hours since midnight. What is

    asked on December 30, 2015
  19. Physics

    During a car crash a 65kg person's head goes from traveling at 50km h-1 to stationary in 0.15s. (a)What is the magnitude of the average net force acting on the head of a person with a 4.5kg head? (b)How does this compare with the weight force acting on the

    asked on September 21, 2012
  20. math- HELP!

    The Fibonacci sequence was first discovered during a study of rabbits. If newborn rabbits become adults in one month, each pair of adult rabbits produces one pair each month, and no rabbits die, then how many pairs of rabbits would be produced after seven

    asked on January 30, 2016
  21. chemistry

    the molar mass of an unknown gas was measured by an effusion experiment. it took 63s for te gas to effuse. where as nitrogen gas took 48sec. what is the molar mass of the gas? 32g/mol 37g/mol 24g/mol 16g/mol 48g/mol

    asked on June 21, 2010
  22. Precalculus

    You want to make an investment in a continuously compounding account over a period of two years. What interest rate is required for your investment to double in that time period? Round the logarithm value and the answer to the nearest tenth.

    asked on November 1, 2015
  23. Physics

    What is the heat required in kilocalories to convert 2 kg of ice at 0°C completely into steam at 100°C? -80 Calories -1440 Calories -4186 Calories -540 Calories Thanks!

    asked on January 8, 2016
  24. History

    How has Israel's security barrier on the West Bank affected Israelis and Palestinians? A. It reduced terrorist attacks against Israelis and blocked some Palestinians from accessing their farmland.++++ B. It reduced rocket attacks against Israel and led to

    asked on November 18, 2019
  25. Pre Calculus HELP!?

    The length of a day in Philadelphia, Pennsylvania, is given by the sinusoidal function, f(t), which represents the number of hours of daylight t days into the year: f(t)= 10+2.8sin(2pi/365)*(t-1.35). How many hours of daylight are there on the 100th day of

    asked on November 26, 2015
  26. Math

    Larry and Gary are discussing whose garden has the most area to plant flowers. Larry claims that all they have to do is walk around the two gardens to get the perimeter and the one with the greatest perimeter has the greatest area. How would you help these

    asked on October 14, 2014
  27. chemistry

    Complete the following fission reaction 1n0 + 235U92 → 131Sn50 + ? + 2 1n0 + energy

    asked on December 6, 2013
  28. Physics

    How do I do these? A passenger at an airport steps onto a moving sidewalk that is 100.0 m long and is moving at a speed of 1.5 m/s. The passenger then starts walking at a speed of 1.0 m/s in the same direction as the sidewalk is moving. What is the

    asked on October 29, 2006
  29. Math

    a park is 3/4 mile long and 1/2mile wide. Which fraction represents the ratio of the parks length to its width? I did it by 3/4 divided by 1/2 this equals 1 1/2 or 3/2 Is this correct?

    asked on March 28, 2013
  30. english 4

    Sandy's throw to first base was short. what is the subject and verb etc..

    asked on March 22, 2012
  31. math

    a number line below -5 -4 -3 -2 -1 0 1 2 3 4 5 Which of the expressions below represent the distance between -4 and 5 on the number line? [ ]= absolute value symbol A. [-4+5] B.[4-5] C.[-4-5] d.[-5-(-4)] I believe it is D, since the absolute value of a

    asked on March 29, 2013
  32. math- HELP!

    Calculate the linear speed of a bicycle with 26-inch wheels being pedaled at a rate of 200 revolutions per minute. Express your answer in inches per minute rounded to the nearest whole number. (Hint: The diameter of the wheel is 26 inches.) I got: linear

    asked on January 1, 2016
  33. Physics

    The intensity of sound is x W/m2 at a distance of 5 m from the source. What is the intensity of the sound at a distance of 20 m from the source? I am not sure how to do this problem. Thank you for your help!

    asked on December 26, 2015
  34. chemistry

    what is the oxidizing agent in the equation 8H(aq)+ 6Cl(aq)+ Sn(s)+ 4NO3(aq)yields SnCl6(aq)+ 4NO2(g)+ 4H2O

    asked on June 19, 2010
  35. physics

    I need help understanding these, please. Thanks! 1. A 2 kg body moves with constant velocity when a force of 10 N is applied. What is the coefficient of kinetic friction between the table and the body? (Would I use F=m*g for this??) 2. Which of the

    asked on October 4, 2015
  36. Physics- HELP PLEASE!

    Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 µC and -6 µC respectively. The charges on the lower left and right corners are -2.4 µC and -9 µC respectively. The net

    asked on January 24, 2016
  37. Physics- Help!!

    A step-up transformer is used on a 100 V line to increase the potential difference to 1200 V. If the primary has 120 turns, then what is the number of turns in the secondary coil? 1440 turns 1000 turns 100 turns 10 turns Thanks!!!!!

    asked on June 9, 2016
  38. Chemistry. Please help!

    Fe3+ + I1- ¨ Fe2+ + I2 1. Balance the equation 2. Which element is being oxidized? 3. Which element is the reducing agent?

    asked on February 20, 2013
  39. chemistry

    In the formation of smog, nitrogen and oxygen gas react to form nitrogen dioxide: N2(g)+2O2(g)→2NO2(g)How many grams of NO2 will be produced when 2.1L of nitrogen at 840mmHg and 28∘C are completely reacted? I know that you use the equation n=PV/RT to

    asked on October 26, 2013
  40. modern world studies

    an isthmus is a(n) a. very tall mountain. b. unique land formation. c. body of water. d. flat grassland region.

    asked on March 15, 2018
  41. World History

    1.) INDUSTRIAL REVOLUTION: Why is there such a massive gap in the world today between rich and poor nations? 2.) IMPERIALISM: How does imperialism continue to affect the world we live in? 3.) WORLD WAR I: How did World War I and new scientific advances

    asked on November 20, 2015
  42. Trigonometry- ??????

    (The number of times a bicycle tire rotates in a given time period is directly related to the distance traveled in that time period. Consider the following scenarios.) 1. Calculate the angular speed of a bike with 26-inch tires rotating at 200 revolutions

    asked on January 1, 2016
  43. Physics

    An 8g bullet leaves a gun at 700ms-1. (a) what is the maximum height that this bullet could reach (ignoring air resistance)

    asked on September 21, 2012
  44. Health, Safety, and Nutrition

    Which if the following is a mandatory standard? (1 point) 1) Food Labels 2) National Health and Safety Standard 3) dietary reference 4) Childmand adult care food program *Havng a hard time finding it in the book

    asked on September 30, 2015
  45. Science

    How would a scientist use DNA to construct a cladogram.

    asked on November 13, 2019
  46. Heath class

    Which of the following foods is usually highest in protein? Apple Chicken Bread Candy bar

    asked on October 9, 2015
  47. Precalculus

    1.) Use sigma notation to describe the sum of the first ten terms of the arithmetic sequence. 20+18.5+17+15.5+14+12.5+11+9.5+8+6.5 2.)Use sigma notation to describe the sum of the first ten terms of the geometric sequence.

    asked on November 14, 2015
  48. Physics

    The Earth has a mass of 5.97 x10^24 kg and the Moon has a mass of 7.36 x10^22kg. The average distance between the center of the Earth and the center of the moon is 3.84 x10^8m. (a) How far away would the Moon need to be for the magnitude of the

    asked on September 21, 2012
  49. math

    Determine the seating capacity of an auditorium with 10 rows of seats if there are 10 seats in the first row, 16 seats in the second row, 22 seats in the third row, 28 seats in the forth row, and so on ???

    asked on October 25, 2009
  50. Health class

    ---- are nutrients that are needed for growth and repair of the body's tissues. Carbohydrates Fats Fibers Proteins

    asked on October 9, 2015
  51. Algebra

    How are solving equations and inequalities the same? How are they different?

    asked on November 3, 2019
  52. Biology

    3. You begin with one cell that contains twelve chromosomes. This cell undergoes one mitotic division (you need to know the end result of mitosis to get this answer right). a. How many cells will you end up with after the cell divides? (1 point) b. How

    asked on January 10, 2019
  53. Math

    The pizza shop offers the top being shown below how many different three topping pizzas can you make pepperoni mushrooms sausage onion ham 6 10 4* 5

    asked on March 1, 2017
  54. Physics

    A hydrogen atom is in the ground state. It absorbs energy and makes a transition to the n = 5 excited state. The atom returns to the ground state by emitting two photons, one in dropping to n = 4 state, and one in further dropping to the ground state. What

    asked on September 30, 2016
  55. Algebra

    Create a multiplication problem whose answer is 8 x 10^13. Both factors must be in scientific notation.

    asked on October 27, 2019
  56. More Physics

    The diagram below indicates three positions to which a woman travels. She starts at position A, travels 3.0 km to the west to point B, then 6.0 km to the north to point C. She then backtracks, and travels 2.0 km to the south to point D. a) What is the

    asked on October 29, 2006
  57. Algebra 1

    The manager of a band recommends that the band sell its CDs for $8.75. The band decides to sell the CD for p dollars. A) Write an absolute value expression that tells how far the bands price is from the recommended price. B) The band wants the price of its

    asked on October 4, 2015
  58. Spanish 7th grade

    I have a question about how to answer this If something is dulce, one would probably want to drink lemonade or a sour drink with it. I know dulce is sweet in Spanish but I don't get the correlation-or is it if you eat something sweet, you want to offset it

    asked on March 13, 2011
  59. Pre-Calculus HELP!

    Explain how the transformations of the functions f(x)=15sin(x) and f(x)=sin(x)+15 differ. I see that f(x)=sin(x)+15 experiences a vertical shift, but I am not sure about the transformation that f(x)=15sin(x) experiences. Thank you for your help!

    asked on November 25, 2015
  60. Math Calc

    A factory produces bicycles at a rate of 100+0.4t2−0.7t bicycles per week (t in weeks). How many bicycles were produced from day 15 to 28? Hint: the lower limit of integration should be the integer number of weeks preceding day 15, i.e. a=2, and the

    asked on April 28, 2015
  61. science

    A diffraction grating has a length of 1.1 cm and contains 1.7e4 lines. Calculate the first order diffraction angle for light with a wavelength of 448 nm. Give you answer in degrees. Anyone know??

    asked on April 16, 2020
  62. Physics

    The fastest recorded pitch in major-league baseball, thrown by Nolan Ryan in 1974, was clocked at 100.8 mi/h. If a pitch were thrown horizontally with this velocity, how far would the ball fall vertically by the time it reached home plate, 60.0 ft away?

    asked on November 14, 2019
  63. Physics

    The moment of inertia of an object depends on the shape of the object, location and orientation of the axis of rotation. For a solid disk, when the disk is rotating about an axis that is perpendicular to the disk and passing through the center of the disk,

    asked on October 29, 2009
  64. math

    a fair coin is tossed in the air 4 times. if the coin lands heads up the first three tosses, what is the probability the coin will land heads up the fourth toss? I think it is 1/2 because the coin has 2 sides and 50% it will land on heads. My friend thinks

    asked on May 12, 2013
  65. Physics

    If a pendulum-driven clock gains 5.00 s/day, what fractional change in pendulum length must be made for it to keep perfect time? Please provide explanations and solutions. Thanks in advance :D

    asked on February 4, 2013
  66. Math

    The heart shaped card is made by placing a square card and two semicircles together. What is the area of the card. each side of the sqare is 8cm long. I did a=TTr(squared)+lw A=TT4squared+8(8) A=TT16+64 A=80TT A+251.3274123 A=251.3 cm(squared) The total

    asked on March 16, 2013
  67. Physics

    An 8g bullet leaves a gun at 700ms-1. (a) what is the maximum height that this bullet could reach (ignoring air resistance)

    asked on September 21, 2012
  68. algebra

    Find the second, fourth, and tenth terms of the sequence described the the rule. A(n)=4+(n-1)(8)

    asked on May 24, 2017
  69. Physics

    A bullet of mass 4.8 g strikes a ballistic pendulum of mass 3.3 kg. The center of mass of the pendulum rises a vertical distance of 9.7 cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed. ....I'm getting an

    asked on October 31, 2011
  70. Physics

    Consider a child standing on a beach who gets hit by a wave. The child weighs 30 kg, and the portion of the wave that hits the child contained 60 kg water. If the wave had a period of 2 seconds and a wavelength of 6 meters, how fast will the child be

    asked on February 9, 2017
  71. Chemistry

    A metal bar having a mass of 212 g is heated to 125.0°C and then dropped into 375 g of water at 24°C. After a while the temperature of the water and the metal is 34.2°C. If the specific heat of the metal is 0.831 J/g°C, how much heat did the metal

    asked on September 13, 2014
  72. Chemistry

    what is the net ionic equation for NaOH + H2SeO3?

    asked on June 19, 2010
  73. Chemistry

    A precipitate will be formed when an aqueous carbonic acid soution is added to what other aqueous solution? A. ammonium chloride B. calcium hydroxide C. Sodium Chloride D. Potassium carbonate E. Nitrous acid

    asked on June 19, 2010
  74. Geometry

    A sailboat is heading directly north at a speed of 16 knots (1 knot = 0.514 m/s). The wind is blowing towards the east with a speed of 10.4 knots. (Both velocities are given relative to the Earth.) Determine the magnitude and direction of the wind velocity

    asked on February 3, 2017
  75. science

    An insect inside a bus flies from the back toward the front at 2 m/a. The bus is moving in a straight line at 2m/a. What is the speed of the insect?

    asked on September 7, 2013
  76. Physics

    A crane is lifting a 500kg payload straight up at a constant speed of 0.7ms-1. (a)What is the power output of the crane. (ignoring losses)? (b)If it takes the cran2 2 minutes to raise the payload to its final height, how far above the ground is this? (c)If

    asked on September 21, 2012
  77. Physics

    Determine the ratio of the relativistic kinetic energy to the nonrelativistic kinetic energy (1/2mv2) when a particle has a speed of (a) 2.60 × 10-3c. and (b) 0.972c

    asked on September 30, 2016
  78. Algebra

    How many terms are in this sum? 5x-6a+8

    asked on September 13, 2011
  79. chemistry

    Complete the following fission reaction 1n0 + 235U92 → 131Sn50 + ? + 2 1n0 + energy

    asked on December 6, 2013
  80. trig

    Find all solutions in the interval [0, 360) 8cos^2x+6cosx+1=0

    asked on April 23, 2017
  81. social studies

    why we can't find many of the Spanish missions from this period in Florida?

    asked on October 24, 2009
  82. Chemistry

    In the complete combustion of C3H8 (propane), how many liters of CO2 are produced from 10 liters of O2?

    asked on January 25, 2016
  83. chemistry

    A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(lIf 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution?)

    asked on December 3, 2013
  84. maths

    the equation for the motion of an object with constant acceleration is d=vt+0.5at^2where d is the distance travelled in ft, v is the starting velocity in ft/s a is the acceleration in ft/s^2 and t is time in seconds a race car begins with a velocity of

    asked on August 16, 2013
  85. Physics

    Two 30kg children in a 20 kg cart are stationary at the top of a hill. They start rolling down the 80m tall hill and they are traveling at 30 km h-1 when they reach the bottom. (The cart had brakes!) How much work was done on the cart by friction during

    asked on September 21, 2012
  86. Physics

    Some stoves use the heat produced by current flowing through a conductor. If the heating element (conductor) has a resistance of 30 ohms, how long will the burner have to work to heat 500 g of 30°C water up to its boiling point? The specific heat of water

    asked on February 7, 2017
  87. Language arts

    What would you expect to be Downy? A diamond ring A baby rabbit * A pair of jeans A fallen pine cone In which sentence do the subject and verbs agree? Both cats and dogs sometimes gets fleas. Neither Philip nor Angie wants to cancel the show.* Automobiles

    asked on February 27, 2017
  88. Math- HELP!

    If a population of fruit flies doubles every 3 days. What is k, the proportionality constant? How would I solve this problem? What would initial value be?? Thanks!

    asked on November 12, 2016
  89. math

    How do I find the quotient of x/2y and (2xy)^2/9xy^3

    asked on March 8, 2019
  90. Algebra

    Jerry writes the expression 8(b-1) +10 for the number of tulips in each border,wherein b is the border number and b is more or equal to 1

    asked on September 22, 2018
  91. MAth

    What is the HCF of 52?

    asked on July 16, 2018
  92. Math

    A communications company erects a 100-foot tall cellular telephone tower on level ground. Determine the angle of depression, θ (in degrees), from the top of the tower to a point 43 feet from the base of the tower. Round answer to two decimal places.

    asked on April 8, 2020
  93. chemistry

    I am having trouble understanding what the concept is for writing these out. Write a balanced nuclear equation for the alpha decay of each of the following radioactive isotopes: curium-243, 22589Ac

    asked on December 5, 2013
  94. Science

    what are two things that you must know to determine speed?

    asked on April 10, 2012
  95. Geometry

    What is the ratio measures of the in-radius, circum-radius and one of the ex-radius of an equilateral triangle? (1) 1 : 2 : 5 (2) 1 : 3 : 5 (3) 1 : 2 : 3**** (4) 1 : 1.4142 : 2

    asked on March 8, 2018
  96. Math

    There were 20 at a round table at dinner, each of whom shook hands with the person on his or her immediate right and left.At the end of dinner, each person got up and shook hands with everybody except the people who sat to his or her immediate right or

    asked on December 13, 2016
  97. writing skills

    2. Because information listed on a website can change from day to day, _______ must be included in the end citation on the Works Cited page.A. the title of the siteB. the publication dateC. the date of accessD. the URLStudent Answer: B Answer:

    asked on April 1, 2015
  98. chemistry

    a 47.7L sample of a gaseous hydrocarbon, measured at 1.00atm and 25degreesC is burned in excess oxygen, liberating 4.33X10^3 kJ of heat at a constant pressure. what is the identity of the hydrocarbon?

    asked on June 21, 2010
  99. Science

    I need a explanation of why u choose to put each career with the specific skill, make sure to support your answer with proper reasoning and examples. Provide two more additional skills needed for each career. I need the answer to have all the scientific

    asked on January 22, 2019

    The first two terms in the expansion of (1+ax/2)^10 + (1+bx)^10 in ascending powers of x., are 2 and 90x^2 Given that a is less than b find the values of the constants a and b . (11 marks) Thanks :)

    asked on March 20, 2014


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