Popular questions and responses by drew
  1. Physics

    Suppose a soccer player kicks the ball from a distance 30 m toward the goal. Find the initial speed of the ball if it just passes over the goal, 2.4 m above the ground, given the initial direction to be above the horizontal.

    asked on January 31, 2016
  2. Pre-Algebra, please help!

    which of these non terminating decimals can be converted into a rational number? a. 0626226222... b. 0.0020220222... c. 0.123123123...*** d. 0.898998999... Am I correct? Thank you!

    asked on October 30, 2015
  3. Chemistry

    a. Calculate the expected freezing-point depression of a 0.200 m KNO3 solution. b. Will the value you calculated match the actual freezing-point depression for this solution? Why or why not? a). -0.372 degrees Celsius b). Possibly because not all of the

    asked on February 3, 2016
  4. Physics

    A frog in a hemispherical bowl, as shown below, just floats in a fluid with a density of 1.26*10e3 kg/m3. If the bowl has a radius of 6.16 cm and negligible mass, what is the mass of the frog?

    asked on June 28, 2011
  5. Math (Probability)

    Each of two urns contains green balls and red balls. Urn I contains 8 green balls and 12 red balls. Urn II contains 5 green balls and 8 red balls. If a ball is drawn from each urn, what is P(red and red)? A. 79/65 B. 24/65 C. 20/33* D. 2/13 You have six $1

    asked on April 29, 2016
  6. physics

    A certain dog whistle operates at 23.5 kHz, while another (brand X) operates at an unknown frequency. If neither whistle can be heard by humans when played separately, but a shrill whine of frequency 9200 Hz occurs when they are played simultaneously,

    asked on April 23, 2012
  7. Language Arts

    4. In which sentence does the prepositional phrase act as an adverb? A. Last Evening, Anne suffered from a headache. B. The door to the attic was left open. C. Mr. Frank discussed the problem of noise in the annex. D. He bought a drink for Mr. Dussel. ***

    asked on March 29, 2016
  8. Math

    37% of college students say they use credit cards because of the rewards program. You randomly select 10 college kids and ask each to name the reason he or she uses credit cards. Find the probability that the number of college students who say they use

    asked on November 25, 2012
  9. chemistry

    How many moles of magnesium is 1.25 x 1023 atoms of magnesium? A. 0.208 × 101 mol Mg B. 2.08 × 101 mol Mg C. 2.08 × 10 -1 mol Mg D. 20.8 mol Mg I think it would be D

    asked on November 10, 2012
  10. physics

    A missile's trajectory takes it to a maximum altitude of 1300Km. If its launch speed is 5.9 Km/s, how fast is it moving at the peak of its trajectory? answer is in Km

    asked on October 20, 2011
  11. college physics

    A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 7.00s later. What is acceleration of rocket. I believe if you use x(final)= x(initial

    asked on September 6, 2009
  12. Pre-Algebra

    At a halftime show a marching band marched in formation. The lead drummer started at a point with coordinates (-2,-5) and moved three steps up and 1 step right. Write a rule to describe the translation. What were the coordinates of the drummers final

    asked on September 28, 2015
  13. Physics

    The surface area of an adult human is about 1.8m2 . Suppose a person with a skin temperature of 34 ∘C is standing nude in a room where the air is 25∘C but the walls are 17 ∘C. A) There is a "dead-air" layer next to your skin that acts as insulation.

    asked on November 30, 2014
  14. Physics Fluids

    When a block of volume 1.00 × 10–3 m3 is hung from a spring scale, the scale reads 10.0 N. When the same block is then placed in an unknown liquid, it floats with 2/3 of its volume submerged. The density of water is 1.00 × 103 kg/m^3. Determine the

    asked on April 6, 2015


    asked on May 12, 2010
  16. Math


    asked on May 18, 2015
  17. math

    how to do pre algebra pizzazz page e 28

    asked on April 15, 2013
  18. Chemistry

    BrO-3 + 5Br- + 6H+ ---> 3Br2 + 3H2O the value of - delta[BrO3]/delta T= 1.5x10^-2M/s at a particular time what is the value of -delta [Br-]/Delta t at the same instant? 13 M/s 7.5x10^-2 1.5x10^-2 3.0x10^-2 330 M/s

    asked on February 25, 2008
  19. Math

    Mark's age, x, is 6 times his age 2 years ago. Which equation represents the statement?

    asked on September 6, 2017
  20. Physics Fluids

    A column of oil of height 70.0 cm supports a column of an unknown liquid. Assume that both liquids are at rest and that the density of the oil is 840 kg/m^3. Determine the density of the unknown liquid.

    asked on April 6, 2015
  21. Chemistry

    Commercial bleach contains 5.25% (by mass) of NaClO in water. It has a density of 1.08 g/mL. Calculate the molarity of this solution. (Hints: assume you have 1 L of solution (mass 1080 g); molar mass of NaClO is 74.4 g/mol)

    asked on March 3, 2010
  22. Math

    Explain how four red marbles can make up 1/3 of a group of marbles and three blue marbles make up 1/4 of the same group.

    asked on February 23, 2010
  23. Physics Fluids

    Water is flowing through a rectangular channel that is 12 m wide with a speed of 0.75 m/s. The water then flows into four identical rectangular channels that have a width of 3.0 m. The depth of the water does not change as it flows into the four channels.

    asked on April 6, 2015
  24. Chemistry

    It is difficult to type these but I'll do my best. This is the first question and I just don't get it. My professor is out of the country so any help would be appreciated. Give the IUPAC name for each of the following alkanes: CH3 I a.

    asked on July 20, 2010
  25. Algebra 2

    The highest speed reached by a solar powered vehicle is 48.71 mph. This record was set by a Sunracycer on June 24, 1988 in Meza, AZ. How far could this car travel in 2.5 hrs at this speed.

    asked on June 15, 2014
  26. chemistry

    how many electrons does Fe3+ gain or lose when the ion forms? A. gains 1 electron B. loses 1 electron C. gain 3 electrons D. loses 3 electrons I think D.

    asked on November 20, 2012
  27. chemistry

    Commercial bleach contains 5.25% (by mass) of NaClO in water. It has a density of 1.08 g/mL. Calculate the molarity of this solution.

    asked on March 3, 2010
  28. business

    For a given nominal interest rate, an unexpectedly low inflation rate ______ the real interest rate. a. increases b. decreases c. has no impact on d. may either increase or decrease e. is subtracted from

    asked on March 17, 2008
  29. Algebra

    If Don Gecewicz invests $5000 at 9% interest compounded quarterly, find the amount after 4 years.

    asked on May 27, 2013
  30. Physics HELP

    You have a converging (convex) lens and a diverging (concave) lens and the magnitude of the focal length of each lens is 38.5 cm. (a) Determine which lens you should use in order to produce an image of a light bulb on a screen several metres away. (b)

    asked on December 4, 2017
  31. NH4NO3 explosive?

    How is NH4NO3 explosive? Please explain with chemical equation. Thank you so much!

    asked on October 6, 2014
  32. Physics

    A sprinter starts from rest and reaches his top speed in 4 seconds running with a constant acceleration. He then maintains that top speed and finishes the 100 m in the overall time of 10 seconds. What is his acceleration?

    asked on February 9, 2010
  33. Physics

    A flowerpot falls off a windowsill and falls past the window below. It takes the pot 0.42 s to pass this window, which is 1.90 m high. How far is the top of the window below the windowsill from which the flower pot fell?

    asked on February 8, 2010
  34. chemistry

    How many atoms are in 3.14 mol of methane (CH4)? A. 7.56 x 1023 atoms B. 7.56 x 102 atoms C. 7.56 x 104 atoms D. 7.56 x 1024 atoms D

    asked on November 10, 2012
  35. Algebra 2

    1.) The chief designer for a large automobile company is considering 4 different radiator grills, 2 different style of headlights, and 5 different rear fender designs. If an automobile style consists of a grill, headlight, and rear fender, how many

    asked on May 8, 2014
  36. math

    HELP ME!!! One of your friends missed the class on scientific notation. Describe how you would explain to your friend what it means for a number to be in scientific notation and how to convert a number from standard form to scientific notation.

    asked on January 10, 2011
  37. Social Studies

    Following World War 1, which industry experienced tremendous growth in the 1920s?

    asked on April 5, 2017
  38. Science

    Which type of energy in the bungee chord prevents the bungee jumper from hitting the ground after a jump? A. kinetic energy B. elastic potential energy *** C. magnetic potential energy D. thermal energy -- Side note: Please help. I am not asking for the

    asked on March 28, 2016
  39. physics

    Suppose a fixed cannon is to fire a projectile at an enemy tank, which is moving toward the cannon at a speed of 15 mph. If the cannon is to fire at the moment the tank is 3 miles from the cannon and the muzzle speed of the cannon is 1100 mph, what is the

    asked on April 6, 2010
  40. chemistry

    The chemical explosive nitroglycerine has the formula C3H5(NO3)3. How many oxygen atoms are in the formula unit for this compound? A. 3 B. 6 C. 9 D. 12 C. 9

    asked on November 10, 2012
  41. chemistry

    How many atoms are in 1.14 mol of propane (C3H8)? A. 7.55 x 1023 atoms B. 7.77 x 1024 atoms C. 7.55 x 1024 atoms D. 7.55 x 1030 atoms C

    asked on November 10, 2012
  42. algebra

    Find S25 for 1/2 + 1 + 3/2 + 2 +... A. 160 B. 162 C. 160.5 D. 162.5 I think D

    asked on March 5, 2013
  43. Chemistry

    When a sample of PCl5(g) (0.02087 mol/L) is placed in 83.00 L reaction vessel at 491.0 °C and allowed to come to equilibrium the mixture contains 103.0 grams of PCl3(g). What is the equilibrium concentration (mol/L) of Cl2(g)? PCl5(g) = PCl3(g)+Cl2(g)

    asked on April 15, 2010
  44. chemistry

    why can I not use the formula m1v1=m2v2 for the following question: What volume of 1.20 M NaOH will be needed to neutralize 225 mL of 3.0 M sulfuric acid? I get 0.56 L but the answer should be 1.1 L. When am I able to use that formula and when can I not?

    asked on October 18, 2009
  45. Physics

    A pilot flies an airplane in a vertical circular loop at a constant speed õ = 160 m/s. If the pilot’s apparent weight at the top of the loop is one-third of his true weight when he is on the ground, find the radius R of the plane’s circular path.

    asked on March 19, 2010
  46. Chemistry

    How much heat is needed to convert 10g ice to 10g water vapor?

    asked on July 7, 2015
  47. Physics

    A 2.5-kg block is sliding along a rough horizontal surface and collides with a horizontal spring whose spring constant is 320 N/m. Unstretched, the spring is 20.0 cm long. The block causes the spring to compress to a length of 12.5 cm as the block

    asked on May 30, 2014
  48. Spanish

    Completa cada oración con la forma correcta de SER o ESTAR. 1.Después del semestre, los estudiantes __________ muy cansados. 2.Mis compañeros y yo __________ trabajando en el mismo proyecto. 3.Esas __________ ideas muy buenas. Las voy a usar para la

    asked on November 4, 2019
  49. algebra

    What is the range of the inverse of relation {(1, 7), (2, -4), (5, 6), (2, 8)}? A. {1, 2, 5} B. {-4, 6, 7, 8} C. {1, 5} D. {-4, 7, 8} B

    asked on February 4, 2013
  50. algebra

    Find S25 for (-7) + (-2) + 3 + 8 +... A. 1,320 B. 1,325 C. 825 D. 820 I think A

    asked on March 5, 2013
  51. Chemistry

    Explain how the presence of several oxygen atoms in a compound containing an -OH group can make the compound acidic. I don't understand this because according to Arrhenius, bases have OH. And it doesn't apply to either Lewis's acid-base theories, or the

    asked on February 11, 2016
  52. Physics

    a crane holds a 500kg wrecking ball in place using a wire with tension T1 and is horizontal to the ground. The crane swings it with a cable under tension T2. if the wire holds the ball in place so the cable forms a 20 degree angle with the vertical,

    asked on November 15, 2015
  53. Math

    Fiind the area bounded by the parabola y^2 = 8x, the x axis and the line x=2

    asked on August 21, 2012
  54. chemistry

    what is the formula for the arsenic ion. A. As3- B. As2- C. As, D. As3+ I say c.

    asked on November 20, 2012
  55. physics

    train is approaching the station at a speed of 20m.s sounds a 220 hz horn. What frequency does an observer on the station platform hear

    asked on February 28, 2011
  56. Math

    There are some caps in a box. 1/6 are red, 1/3 are blue, and 3/7 of the remainder are green. If there are 27 green caps, how many caps are there all together?

    asked on November 14, 2013
  57. Chemistry

    Propane gas is stored in a tank at a pressure of 15.0 atm at 22.0 °C. The tank can hold a pressure of 42.0 atm before bursting. During a fire the gas is heated to 600.0 °C. What is the gas pressure, and will the tank contain the gas without bursting? I

    asked on April 9, 2016
  58. math

    Theater Total Value of Ticket Sales A $1,600 B $2,000 C $1,800 D $4,800 E $3,200 The table above shows the total value of the ticket sales for an afternoon show in each of five movie theaters. There were 300 tickets that were sold for each theater. The

    asked on November 13, 2015
  59. physics grade 11

    A 4.3 kg bucket of water is raised from a well by a rope. The acceleration of gravity is 9.8 m/s2 . If the upward acceleration of the bucket is 4.6 m/s2, find the force exerted by the rope on the bucket. Answer in units of N. I'm almost sure the answer

    asked on October 17, 2010
  60. science

    Which statement most accurately compares Earth’s crust and Earth’s mantle?

    asked on May 9, 2017
  61. Chemistry 101

    A solution containing 83.100 g of sodium hydroxide [molar mass = 40.0 g/mol] was neutralised using phosphoric acid. Calculate the moles of sodium phosphate formed (assuming that the reaction goes to completion). Give your answer to three significant

    asked on October 13, 2014
  62. algebra

    Find f(x)·g(x) if f(x) = 3x and g(x) = x + 1. A. 3x2 + 3x B. 3x + 1 C. 4x + 1 D. 3x2 + 1 A

    asked on February 3, 2013
  63. Chemistry

    This is the first in a series of hw pages. If anyone would be able to help me with this one I think I would be able to complete the other 20 hw questions I have. Thanks to anyone that helps. For each definition, find a corresponding term from the following

    asked on July 20, 2010
  64. math

    A farmer's land is separated into sections of size 215 acres. Suppose there are 449 such sections. How many acres of land does the farmer own? Write your answer as a mixed number in simplest form.

    asked on June 18, 2018
  65. physics

    Calculate the speed of a 10,000 kg airliner with a kinetic energy of 3.1 x 10^9 J.

    asked on December 1, 2012
  66. Math(solid mensuration)

    The lateral edges of edge 8m of an oblique square prism is inclined at an angle of 30 degrees with the altitude. What is the altitude of the prism?...

    asked on April 30, 2016
  67. Algebra 1 Check

    This is the last question on my homework and I wanted to know if I got it right. Thanks! Which of the following inequalities is true for all real numbers of x? a.) x^2≤x^3 b.) 2x^3≤4x^2 c.) 4x^2≤(4x)^2 d.) 4(x-3)^2≥4x^2-3 My answer: C.

    asked on October 3, 2014
  68. Algebra

    Jennifer has a recipe that calls for horseradish sauce that is 45% pure horseradish. At the grocery store she finds one horseradish sauce that is 30% pure horseradish and another that is 80% pure horseradish. How many teaspoons of each of these horseradish

    asked on March 3, 2013
  69. trig

    Find the other endpoint of the line segment with the given endpoint and mid point. 1. Endpoint:(-1, 9), midpoint: (-9, -10) 2. Endpoint: (2, 5), midpoint: (5, 1) 3. Endpoint:(9, -10), midpoint: (4, 8)

    asked on March 28, 2012
  70. chemistry

    A solution was made by dissolving 10.0g of a nonvolatile nonelectrolyte compound in 100.0g of water froze at -0.93C. What is the approximate molecular weight of the substance. (for water..kf=1.86C/m) (m is molality)

    asked on December 12, 2011
  71. Physics

    A car is approach a corner too fast and locks up the brakes at point A and holds them on for 12.5 M to point B. The car then moves from point B at a constant speed and does into the corner. At Point C because the car is still going to fast it goes out of

    asked on January 20, 2011
  72. Physics

    A basketball player attempting a free throw shoots the ball at an angle of 35 above the horizontal. The basket is 4.21 m from the foul line and 3.05 m above the floor. If the ball is released at a height of 1.83 m above the floor and it goes through the

    asked on February 11, 2010
  73. Math

    How many 6 inch pieces can you cut from a spool of ribbon that is 10 yards long?

    asked on April 4, 2013
  74. Math

    Althea invested $10,000 for one year, part at 7% and part at 6 1/4%. If she earned a total interest of $656.50, how much was invested at each rate?

    asked on March 3, 2013
  75. chemistry

    a compound is found to be 94.1% o and 5.90% h. its molecular mass is 34.0. what is its molecular formula A. H3O2 B. OH C. H2O D. H2O2 I think D

    asked on November 23, 2012
  76. science-reasoning

    light travells in a straight line at a constant speed of 300,000 km/sec. what is the light's acceleration?

    asked on October 20, 2007
  77. algebra

    Christine lives in Bangor, Maine , and her friend Denise Brown lives in Sioux City, Iowa. They both drive to Dade City, Florida, for the winter. The trip is 1600 miles for Christine and 1500 miles for Denise. If Christine drives 5 miles per hour faster

    asked on May 2, 2013
  78. Chemistry

    How many milliliters of 0.230 M Na2S2O3 solution are needed to titrate 2.349 g of I2 according to the equation below? I2(aq)+2S2O3^2-(aq)->S4O6^2-(aq)+2I^1-(aq)

    asked on October 6, 2010
  79. Chemistry

    Given the same reaction as before: 4 KO2 + 2 H2O + 4 CO2 ==> 4 KHCO3 + 3 O2 Great! 3.21 moles of O2 were produced. Now, How many molecules of O2 does this number of moles represent?

    asked on February 8, 2018
  80. Chemistry

    A 50mL solution of Histidine-HCl (Histidine: pKa1=1.8, pKa2=9.2, pKa3=6.0)is titrated with 0.500M NaOH. What is the expected pH of the histidine solution at the points in the titration when 14.0mL, 26mL, and 38mL of the NaOH titrant is added?

    asked on October 2, 2013
  81. physics

    While you are in detention after school, your teacher tells you to slide a large, 89.7 kilogram box across the floor. The coefficient of static friction (ìstatic) between the box and the floor is 0.50. Compute the force parallel to the ground (F

    asked on January 12, 2015
  82. chemistry

    boron-10 has an atomic number of 5. how many neutrons are in this isotope? 0 neutrons, 2 neutrons, 5 neutrons, 10 neutrons. I say 5

    asked on November 19, 2012
  83. chemistry

    What is the molarity of the solution produced when 14.1 grams of ammonia is dissolved in sufficient water to prepare .100 liters of solution?

    asked on May 22, 2012
  84. physics

    A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 7.00 later.

    asked on September 6, 2009
  85. science-reasoning

    in 5 seconds, a car moving in a straight line increases it's speed from 50km/h to 65km/h, while a truck goes from rest to 15km/h in a straight line. which undergoes greater acceleration? what is the acceleration of each vehicle?

    asked on October 20, 2007
  86. Physics

    A mass m1 = 4.1 kg rests on a frictionless table and connected by a massless string to another mass m2 = 5.9 kg. A force of magnitude F = 32.0 N pulls m1 to the left a distance d = 0.83 m. 1) How much work is done by the force F on the two block system? 2)

    asked on January 2, 2013
  87. chemistry

    what is the percent by mass of carbon in c3h8? A. 18.20% B. 20.0% C. 81.8% D. 85.0% I say A

    asked on November 23, 2012
  88. chemistry

    in the formula for calcium bromide (CaBr2), what does the subscripted two indicate? A. the bromide atom has a charge of 2- B. the bromide atom has a charge of 2+ C. there are two bromide atoms for every calcium atom. D. there are two calcium atoms for

    asked on November 20, 2012
  89. math

    On a cold winter day, the temperature is -10.0º C. What is the reading on the Fahrenheit scale? A. 10.0 oF B. 12.0 oF C. 13.0 oF D. 14.0 oF I say A

    asked on November 7, 2012
  90. Chem

    H2SO4(aq) + Ba(NO3)2(aq) = BaSO4(s) + 2HNO3(aq) overall heat gen by reaction answer is supposed to be -659.3 but I keep coming up with something else.

    asked on December 14, 2010
  91. physics grade 11

    A 4.3 kg bucket of water is raised from a well by a rope. The acceleration of gravity is 9.8 m/s2 . If the upward acceleration of the bucket is 4.6 m/s2, find the force exerted by the rope on the bucket. Answer in units of N. I'm almost sure the answer

    asked on October 17, 2010
  92. physics

    A steel cable is stretched across a gorge. The cable is 190 m long and has a mass of 44 kg. When one end of the cable is struck with a hammer, a wave pulse travels down the cable, reflects at the far end, and is detected back at the first end 14 s later.

    asked on May 18, 2010
  93. calculus (related rates)

    A particle moves in the plane along the curve y=xln(x). At what rate is the distance from the origin increasing at the moment its x-coordinate is 2 cm and its x-coordinate is increasing at a rate of 17 cm/sec?

    asked on October 27, 2009
  94. math

    on a certain farm, on average, 64 hens lay 768 eggs in 64 days. also on average, 46 hens on same farm eat 46 kilograms of wheat in 46 days. On this farm, on average, the consumption of how much wheat (in kg) corresponds to 2 dozen eggs?

    asked on September 25, 2008
  95. Physics

    what is the word used for distance traveled per time unit? What is speed in a given direction? And what is the word used for A moving object traveling the same distance in equal units of time?

    asked on September 15, 2008
  96. algebra

    Simplify the rational expression: x−5 /x 2 −x−20 A. x−4 B. x+4 C. x 2 −15 D 1 /x+4 D

    asked on February 3, 2013
  97. chemistry

    amphetamine (c9h13n) is a powerful stimulant. what is the percent composition of all of the elements in this compound? A. 9%C;13%H;1%N B. 30%C;10%H;60%N C. 60%C;35$H;5%N D. 80%C;9.6%H;10.4%N I think b

    asked on November 23, 2012
  98. calculus

    A balloon is being filled at a rate of 4000 cm^3/min. How fast is the surface area of the ballon increasing when the radius is 125 cm? V=4/3pir^3, SA=4pir^2

    asked on April 23, 2012
  99. physics

    FM radio signals are electromagnetic waves transmitted between frequencies of 88 MHz and 107 MHz. Find the range of wavelengths for these signals. largest___m smallest___m

    asked on April 16, 2012
  100. Chemistry

    Now if your lab partner determined that there were 3.824 x 1023 atoms of H in an unknown sample of C2H4Cl2, how many milligrams would the unknown sample weigh?

    asked on February 8, 2018


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