Popular questions and responses by ANN
  1. Physics

    A 15 kg block is on a ramp which is inclined at 20 degrees above the horizontal. It's connected by a string to a 19kg mass which hangs over the top edge of the ramp. With no frictional forces taken into account, what is the magnitude of the acceleration of

    asked on November 9, 2017
  2. cell biology

    What is the mass of 2.00 L of an intravenous glucose solution w/ a density of 1.15 g/ml?

    asked on February 25, 2011
  3. college physics

    A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.860 m/s encounters a rough horizontal surface of length = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.355 and he exerts a

    asked on November 21, 2011
  4. maths help

    Please could you answer my question

    asked on January 3, 2018
  5. Math(simple interest)

    A person borrows two equal sums of money at the time at 5% and 3.75% simple interest respectively & finds that if he repays the former sum a year before the latter the amount paid in each case is the same that is Rs.736. Find the total sum borrowed.

    asked on January 8, 2017
  6. math


    asked on April 12, 2018
  7. maths

    A sculpture needs to lift a piece of is a cuboid with dimensions 1m by 0.6m and 0.3m.marble has a density of 2.7. work out the mass.

    asked on January 3, 2018
  8. Math

    The equation V=1/3 Bh gives the volume V of a pyramid, where B is the area of the base and h is the height. Solve this equation for B. Please help me and show your work thanks

    asked on February 16, 2012
  9. Math

    Drawing a least one king when you draw a card from a standard deck 8 times (replacing the card each time you draw, so there are always 52 cards in the deck) P(at least one king in 8 attempts)= [P(1 king + 2 kings + 3 kings + 4 kings]^8 = 1/52 + 2/52 + 3/52

    asked on November 7, 2015
  10. Dudas

    John's mass is 86 kg, and Barbara's is 55 kg. He is standing on the x axis at xj = +9.0 m, while she is standing on the x axis at xb = +2.0 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch?

    asked on October 29, 2014
  11. physics

    A ventilation fan has blades 0.25 m in radius rotating at 20rpm. What is the tangential speed of each blade tip? i don't understand how to do tangential speed.

    asked on January 11, 2011
  12. Physics

    A circuit consisting of three resistance 12ohm, 18ohm and 36ohm respectively joined in parallel, and connected in series with the fourth resistance. The whole circuit is supplied at 60volts and it is found that the power dissipated in the 12 resistance is

    asked on July 8, 2019
  13. Physics

    An electron is projected into a uniform electric field E = (1000 N/C)i with an initial velocity (2.00* 10^6m/s)i in the direction of the field. How far the electron travel before it is brought momentarily to rest?

    asked on January 26, 2020
  14. Physics test review

    A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the

    asked on November 8, 2014
  15. Physics

    Two gliders on an air track collide in a perfectly elastic collision. Glider A has mass 1.1 kg and is initially travelling at a velocity of 2.7 m/s [E]. It collides head-on with glider B with mass 2.4 kg, travelling at a velocity of 1.9 m/s [W]. Determine

    asked on December 13, 2017
  16. algebra Please help

    .A toy rocket is shot vertically into the air from a launching pad 5 feel above the ground with an initial velocity of 72 feet per second. The height h, in feet, of the rocket above the ground as t seconds after launch is given by the function

    asked on June 2, 2015
  17. chemistry

    A solution contains 2 mEq/ml of KCL (Molecular weight 74.5). If a 20 ml ampule of this solution is diluted to 1 liter what is the percent strength of the resulting solution?

    asked on February 21, 2013
  18. physics

    A dockworker loading crates on a ship finds that a 20 kg crate, initially at rest on a horizontal surface, requires a 73 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 50 N is required to keep it moving

    asked on December 7, 2011
  19. physics

    How much force is the air exerting on the front surface of the book with dimensions 19 x 27 cm. Assume atmospheric pressure equal to 100,000 Pa.

    asked on April 12, 2011
  20. Math

    A play has two roles for men and four roles for women if five men and 12 women tryout for these parts,in how many different ways can the director choose people for the roles

    asked on March 8, 2017
  21. physics

    A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 79.0 m/s at ground level. The engines then fire, and the rocket accelerates upward at 3.90 m/s2 until it reaches an altitude of 980 m. At that point its

    asked on August 25, 2013
  22. math

    If it has been determined that the probability of an earthquake occurring on a certain day in a certain area is 0.05, what are the odds against an earthquake? multiple choice A) 20 : 1 B) 1 : 20 C) 18 : 1 D) 19 : 1 3

    asked on October 11, 2009
  23. algebra

    The intensity I of light bulb measured in watts per square meter (w/m^2), varies inversely as the square of the distance d from the light bulb . . suppose I is 45 w/m^2 when the distance is 5 m . find the intensity when the distance from the light bulb is

    asked on May 15, 2015
  24. maths

    April has 3 pounds of trail mix. She puts equal of amounts in each of 8 bags. How much trail mix is in each bag?

    asked on November 30, 2014
  25. Math

    What is the net price factor for trade discounts of 25/15/10? Answer: .57375 Just checking my homework answers

    asked on May 20, 2013
  26. English

    just can't figure these sentences out. have to rewrite these sentences, correcting the problem of incorrect omission.? 1. A liberal arts background is excellent for such professions as lawyers and doctors. 2. American colleges consistently produce more

    asked on March 19, 2011
  27. statistics

    the scheduled commuting time on Long Island Rail Road from Glen Cove to New York is 65 minutes. Suppose that the actual commuting time is uniformly distributed between 64 and 74 minutes. What is the probability that the commuting time will be a) less than

    asked on January 11, 2011
  28. physics

    To balance a 40.8-kg automobile tire and wheel, a mechanic must place a 41.7-g lead weight 25.0 cm from the center of the wheel. When the wheel is balanced, its center of mass is exactly at the center of the wheel. How far from the center of the wheel was

    asked on December 2, 2010
  29. chemistry

    At 1500 °C, Kc = 5.67 for the reaction CH4(g) + H2O(g) CO(g) + 3H2(g) Calculated value of ΔG°1773 for the reaction at this temperature.

    asked on March 5, 2016
  30. Chemistry

    A syrup is added to an empty container with a mass of 104.70 g . When 0.140 pint of syrup is added, the total mass of the container and syrup is 150.01 g . (1 qt = 2 pt) 0.140 pint= 66.2 mL 150.01g mass container and syrup 104.70g mass empty container

    asked on August 29, 2015
  31. chem

    I have no idea where to start with this one... Calculate the concentration (M) of sodium ions in a solution made by diluting 40.0ml of a 0.474m solution of sodium sulfide to a total volume of 300ml

    asked on March 8, 2015
  32. MEC

    two charges repel each other with a force of 0.1N when they are 5cm apart. Find the forces between the same charges when they are 2cm and 8cm apart.

    asked on October 24, 2012
  33. Chem

    Select sequence that corresponds to the following: CTCGA TTAAGG CTCGG AATTCC GAGCT GAGGAG

    asked on June 28, 2017
  34. Forensic science

    The_____________spectrum is so complex it is considered to be unique: Visible Ultraviolet Infrared Microwave Fluorescence

    asked on June 13, 2017
  35. Pre-Calculus

    Consider the chemical reaction aC2H6 + bCO2 + cH2O → dC2H5OH, where a, b, c, and d are unknown positive integers.? The reaction must be balanced; that is, the number of atoms of each element must be the same before and after the reaction. For example,

    asked on December 4, 2013
  36. algebra

    what is x short leg for right triangle when given long leg b is 1/2x +11 when given hypotenuse c is 2x + 1 i put (-1/2x + 11) +(2x + 1) = x and came out with 20 but that did not work out when squared A + b = C. I estimated x/a = 8, then b = 15 and c = 17

    asked on April 4, 2012
  37. forensic science

    Identification is the examination of chemical and physical properties of an object and using the results to categorize the object as a member of a group. Which of the following are examples of identification? Determination that hairs found on a bag are

    asked on May 31, 2017
  38. Calculus

    Why does 2ln6 - 2ln3 = ln4?

    asked on May 5, 2014
  39. Math

    By what percent is a 100-watt light bulb brighter than a 60-watt light bulb? Round to the nearest tenth. 40/60 = 2/3 = 2 ÷ 3 = 0.666667 0.666667 x 100 = 66.6667% Answer: 66.7% Is this correct?

    asked on May 13, 2013
  40. Statistics

    The probability that a radish seed will germinate is 0.6. Estimate the probability that of 130 randomly selected seeds, exactly 90 will germinate. Note: I keep getting the answer wrong.

    asked on July 20, 2012
  41. statistics

    assume the mean height of soldiers to be 68.22 inches with a variance of 10.8 inches. how many soldiers in a regiment of 1000 would you expect to be over 6 feet tall

    asked on September 15, 2011
  42. Physics

    A football player of mass 103 kg running with a velocity of 2.0 m/s [E] collides head-on with a 110 kg player on the opposing team travelling with a velocity of 3.2 m/s [W]. Immediately after the collision the two players move in the same direction.

    asked on December 13, 2017
  43. forensic

    __________________ appear to match in one set of lighting conditions, but not in another. Dyes Pigments Metameric colors Simultaneous contrast colors Fluorescent fibers

    asked on July 21, 2017
  44. Geometry

    A secant and a tangent to a circle intersect in a 42 degree angle. The two arcs of the circle intercepted by the secant and tangent have measures in a 7:3 ratio. Find the measure of the third arc. If someone could help me figure out how to do the

    asked on February 11, 2015
  45. Pre-Calculus

    Let f(x) be the function 1/(x+9). Then the quotient [f(5+h)−f(5)]/h can be simplified to −1/(ah+b). What does a and b equal to? So I understand the overall concept, and did f(5+h) = 1/(14+h) and f(5) = 1/14. Then to subtract the two, you get the common

    asked on October 18, 2013
  46. statistics

    a study of the time spent shopping in a supermarket for a market basket of 20 specific items showed an approximately uniform distribution between 20 minutes and 40 minutes. What is the probability that the shopping time will be a) between 25 and 30

    asked on January 6, 2011
  47. Child Care

    Which of the following statements regarding the zone proximal development is true? A.It refers to the need for adequate play safety. B.It states that time outs should increase as children get older. C. It suggests that consequences should be more severe

    asked on February 24, 2009
  48. math

    A computer password is required to be 5 characters long. How many passwords are possible if the password requires 2 letter(s) followed by 3 digits (numbers 0-9), where no repetition of any letter or digit is allowed?

    asked on May 23, 2020
  49. Algebra

    A tennis player's swing moves along the path of an arc. If the radius of the arc's circle is 4 feet and the power and the angle of rotation is 100 degrees, what is the length of the arc?

    asked on April 11, 2015
  50. chemistry... HELP !!!!!!!

    For the reaction 2Co^3+ (aq) + 2Cl^- (aq) ----> 2Co^2+ + Cl2 (g) E^o = 0.46 V (STANDARD cell potential) what is the cell potential at (25 deg C) if the concentrations are [Co^3+] = 0.651M , [Co^2+]= 0.846 M, and [Cl^-] = 0.636 M and the pressure of Cl2 is

    asked on November 5, 2012
  51. Chemistry

    Which of the following combinations would require an electrolytic cell? coat aluminum onto iron coat iron onto lead coat copper onto tin coat calcium onto iron Please help.

    asked on May 3, 2012
  52. Math

    The sides of a rectangle are in the ratio 2:5. The perimeter of the rectangle is 70cm. What is the Width of the the rectangle.

    asked on January 4, 2012
  53. math

    The derivative of f(x) = x^4/3 - x^5/5 attains its maximum value at x =

    asked on December 27, 2011
  54. English

    Choose the correct sentence pattern for the sentences below? 1) There is good reason to be thankful. 2) The President sent the ambassador an invitation to the meeting. 3) Snow skiing is a very exciting sport. 4) I hereby declare Tuesday Shakespeare Day.

    asked on March 31, 2011
  55. Physics

    Three charges lie along the x-axis. The positive charge, q1 = 15 µC, is at x= 2.0 m, and The positive charge, q2 = 6.0 μC, is at the origin. At what point on the x-axis must a negative charge, q3 , be placed so that the net force acting on it is zero?

    asked on January 25, 2020
  56. forensic

    Select the proper order of examination "Fingerprints, trace evidence, DNA" "Disease diagnosis, DNA, fingerprints" "Ink analysis, content analysis, DNA" "Handwriting, ink analysis, DNA" None of the above my answer is the first one

    asked on June 4, 2017
  57. algebra

    A private plane traveled from Seattle to the rugged wilderness at a average speed of 176 mph. on the return trip the average speed was 308 mph. if the total traveling time was 5 hours. How far is Seattle to the wilderness? please help

    asked on May 14, 2015
  58. Chemistry

    E=hv E=energy h= Planck's constant =6.626 x 10^-34 v= frequency 1. What is the energy of light having a frequency of 2.28 x 10^12? ( I do have an answer for this but I'm not so sure about it.) 2.What is the energy of light with a wavelength of 2.18 x

    asked on December 3, 2014
  59. chemistry

    Hello, Please help me with this question! Which dilution would turn 10% (by mass) HCl solution into 0.100 M HCl solution? Density of 10% HCL = 1.08 g ml^-1

    asked on July 23, 2014

    A biased coin is tossed 5 times where p(t) = .6. determine the probability that if you have 2 tails, you have 3 tails.

    asked on May 25, 2013
  61. chem

    what is the difference between a bunsen burner and a lab burner?

    asked on September 18, 2012
  62. introduction of computer

    Your mom is trying to save room on her hard drive and wants to uninstall some of her applications. She asks you how to do this. What do you tell her? Question 2 options: a) Find the application folder in Windows Explore and select Uninstall from the

    asked on September 2, 2019
  63. algebra

    The circle has a circumference of 50.24. Using 3.14 to approximate pi​, find the value of x.       A circle with a radius labeled x plus 3. x + 3

    asked on May 7, 2018
  64. Physics

    A squid can propel itself by taking water into its body and then expelling it. A 0.60 kg squid expels 0.30 kg of water with a velocity of 20 m/s [S]. What is the speed of the squid immediately after expelling the water?

    asked on December 13, 2017
  65. Reading and writing skills

    A sentence is a group of words expressing a complete thought and each will begin with a capital letter?trueor false?

    asked on September 16, 2015
  66. math

    stamjps are sold in bookiets of 100,50, and 10.find as many different ways to buy 200 stamps as you can. record your work in the chart. could you give me some examples...please!

    asked on September 18, 2014
  67. algebra

    Mary has a total of $5000 invested in two accounts. One account pays 5% and the other 8%. Her interest in the first year was $331. Write and solve a system of equations to find out how much she has invested in both accounts

    asked on March 26, 2014
  68. Math

    An athletes long jump rounded to the nearest metre was 8 m. What are the longest and shortest lengths the jump could have been in decimals to the hundredths.

    asked on January 29, 2014
  69. math

    Find last years salary if after a 3% pay raise this years salary is $35,020

    asked on October 23, 2013
  70. statistics

    Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends

    asked on May 27, 2013
  71. Math

    Natureland Garden Center buys lawn mowers that list for $679.95 less a 30% trade discount. What is the dollar amount of the trade discount? Answer: 203.99 What is the net price of each Natureland Garden Center lawn mower? Answer: 475.96 Just want to make

    asked on May 20, 2013
  72. Math

    A letter carrier can deliver mail to 112 homes per hour by walking and 168 homes per hour by driving. By what percent is productivity increased by driving? Answer: 56% Is my answer correct?

    asked on May 13, 2013
  73. chemistry

    what elements follow the octet rule?

    asked on November 9, 2012
  74. social Studies

    What are some good questions to ask about latitude and longitude and the prime Meridian and the Equator? Pease have at least 3 good questions. Pease help me. This is worth 100 points so please help!

    asked on August 24, 2011
  75. 6th grade math

    There are three crowns in the royal cabinet: One for the King, One for the Queen, and one for the Princess. The king's circumference was 21.98 in, the Queen's circumference was 43.96 cm and the Princess' circumference as 392.5 mm. What are the Diameters's

    asked on April 27, 2011
  76. geometry

    a rectangular box has dimensions 9cm by 6 cm by 24 cm. a second rectangular box has volume one-half of the first and has a base 6 cm by 4 cm.what is the height of the second box

    asked on February 9, 2011
  77. English

    Need to label the verb wish A for action of L for Linking... 1. The koala bears have climbed the tree. Answer=A 2. The peacock seemed more beautiful than before. Answer=A 3. In the rain forest display at the zoo, the birds looked stange and exotic.

    asked on March 28, 2011
  78. Math

    Clara earns an hourly rate of $20 per hour and 5% commission. Rose earns an hourly rate of $16 per hour and 10% commission. They each work a 40-hour week. In one particular week, Clara and Rose both sold the same value of goods and both received the same

    asked on April 3, 2018
  79. MATH


    asked on October 28, 2017
  80. forensic science

    Select the correct order of the GC components Column, Recorder, Carrier Gas, Flow Controller, Detector Recorder, Carrier Gas, Column, Detector, Injector port Injector port, Carrier Gas, Detector, Recorder Carrier Gas, Column Oven, Flow Controller, Detector

    asked on June 22, 2017
  81. Chem

    The objective lens of a compound microscope has a numerical aperture of 0.4. The maximum useful magnification of the microscope is: 400x 1,000x 10x There is not enough information given to calculate this the correct answer is not given

    asked on June 6, 2017
  82. Math

    If you flip three fair coins, what is the probability that you'll get a head on the first flip, a tail on the second flip, and another head on the third flip?

    asked on April 15, 2017
  83. Math

    In the jazz band at Wyatt's school, there are 15 trumpets and 9 trombones. Find the ratio of trombones to trumpets?

    asked on September 22, 2016
  84. Math

    Theo made the table below to show the number of middle school students who attented the last football game. if this data were displayed in a circle graph, how many degrees would be in the sector representing the 8th grade Grades 6,7,8 # of students in 6th

    asked on March 16, 2015
  85. statistics

    The scores for math test #3 were normally distributed. If 15 students had a mean score of 74.8% and a standard deviation of 7.57, how many students scored above an 85%?

    asked on December 10, 2014
  86. Pre-Calculus

    A machine worth $ 11000 new and having a scrap value of $ 10995.6 is to be depreciated over a 4.4 -year life. Find the function that describes straight line depreciation for this situation. At what time will the machine be worth $ 10997.8 according to this

    asked on September 28, 2013
  87. physics

    a small pith ball carries a charge of -1.3 uc. how many excess electrons does this represent?

    asked on May 17, 2012
  88. dressmaker

    when paper pattern pieces are dovetailed in cutting layout they're placed so they A-all face the same direction. B fit closely together to save fabric.c have their grain lines on the bias. d are lying face down on the fabric

    asked on March 21, 2012
  89. macroeconomics

    Suppose that France and Denmark both produce oil and olives. Frances’s opportunity cost of producing a crate of olives is 4 barrels of oil, while Denmark’s opportunity cost of producing a crate of olives is 7 barrels of oil. By comparing the

    asked on February 5, 2012
  90. algebra

    please help me here with a and b and do i have c and d correct?, i do not know how to start. john put his spare change in jar every night. If he has $11.09, at end of Jan. . 22.27 at the end of feb, 44.35 in April, 75.82 in july, 89.00 in aug. and 114.76.

    asked on January 16, 2012
  91. physics

    A 4.5-kg ham is thrown into a stationary 15-kg shopping cart. At what speed will the cart travel if the ham had an initial speed of 2.2 m/s? If the ham hits the cart with 2N of force, how long did the collision between the two last?

    asked on June 29, 2011
  92. Physics

    If a rock is dropped from a height of 64 feet, how long does it take to hit the ground? How fast is it going when it hits the ground?

    asked on April 2, 2011
  93. Calculus

    Which vector is not collinear with vector a=[6,-4]? A: [3, -2] B: [-6, -4] C: [-6, 4] D: [-9, 6]

    asked on May 8, 2010
  94. trig

    please help me. use trig. identities to find the exact value. tan 25° + tan 5° / 1- tan 25° tan 5°

    asked on April 30, 2010
  95. 205

    The Death Penalty Should Not Be Abolished "Capital punishment produces a strong deterrent effect that saves lives." Muhlhausen argues that capital punishment should not be abandoned because it deters crimes, saves lives, and the majority of American

    asked on October 2, 2009
  96. Physics

    Two small metallic spheres, each with a mass ofm = 3.00 g, are suspended from a common point by two strings of negligible mass of length L = 62.0 cm. When the spheres have an equal amount of charge, the two strings make an angle of 60° with each other.

    asked on January 27, 2020
  97. Physics

    A sphere has a net charge of 8.03 nC, and a negatively charged rod has a charge of −6.05 nC. The sphere and the rod undergo a process such that 5.40 ✕ 109 electrons are transferred from the rod to the sphere. What are the charges of the sphere and the

    asked on January 27, 2020
  98. Math

    The perfect paving company charges $10 per square foot to install interlocking paving stones, as well as a $40 delivery fee. Determine the greatest area andrew can pave for $3500.

    asked on September 14, 2019
  99. Math

    A pears rolls across a table with a speed of 0,5 m/s and falls off the edge, if it lands 3m from the edge of the table from what height does it fall

    asked on January 22, 2018
  100. Physics

    A tennis ball with mass 57 g is travelling at 25 m/s [S] when it is intercepted by a tennis racquet for 4.0 ms after which the ball travels at 32 m/s [N]. What is the impulse imparted by the tennis racquet?

    asked on December 13, 2017


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