Popular questions and responses by erin
  1. physics

    The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis through its center. When the skater's hands and arms are brought in and wrapped around his body to execute the spin, the hands

    asked on April 12, 2008
  2. physics

    As you hurry to catch your flight at the airport, you encounter a moving walkway that is 85m long and has a speed of 2.2 m/s relative to the ground. If it takes you 68s to cover 85m when walking on the ground, how long will it take you to cover the same

    asked on October 2, 2011
  3. statistics

    the probability that a football game will go into overtime is 17%. In 240 randomly selected football games, what is the mean and the standard deviation of the number that went into overtime

    asked on June 23, 2013
  4. physics

    A solid uniform marble and a block of ice, each with the same mass, start from rest at the same height above the bottom of a hill and move down it. The marble rolls without slipping, but the ice slides without friction. Find the speed of each of these

    asked on April 6, 2008
  5. chemistry

    Calculate the amount of heat required to completely sublime 24.0 g of solid dry ice CO_2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.

    asked on September 7, 2008
  6. calculus

    Find the dimensions of the rectangle with area 225 square inches that has a minimum perimeter, and then find the minimum perimeter.

    asked on March 29, 2020
  7. History

    What impact did industrialization have on imperialism? a. Developing European nations needed to conquer foreign territory to compete with industrialized nations b. An increase in production lead to the need for new land to build factories in foreign

    asked on February 25, 2019
  8. chemistry

    How do you do the hybridization of CBr4?

    asked on March 5, 2012
  9. Physics

    A child pedals a tricycle, giving the driving wheel an angular speed of w=.875 rev/s. If the radius of the wheel is r=0.260 m, what is the child's linear speed, v?

    asked on June 30, 2019
  10. Languege arts

    1. Which is the BEST summary of "LAFFF"? (1 point) Angela used a time machine to win a writing contest. Peter and Angela invented a time machine. Peter used a time machine to travel to the future. 2. The author describes Peter's Halloween costume in order

    asked on February 7, 2013
  11. Physics

    A skateboarder at a skate park rides along the path. If the speed of the skateboarder at point A is v=1.4 m/s what is her speed at point B? Point A = 2.7 m & Point B=1.0 m

    asked on June 30, 2019
  12. Trig

    The seats of a Ferris wheel are 40 feet from the​ wheel's center. When you get on the​ ride, your seat is 6 feet above the ground. How far above the ground are you after rotating through an angle of 17pi/4?

    asked on June 2, 2018
  13. math

    A hot air balloon descends at a rate of 320 feet per minute for 3 minutes. Whats the balloons total change in altitude?

    asked on May 17, 2013
  14. Math

    How do you set this up? Solve the system using substitution: A boat travels 18 miles downstream in 1.5 hrs. It then takes the boat 3 hrs. to travel upstream the same distance. Find the speed of the boat in still water and the speed of the current. Thanks

    asked on December 6, 2012
  15. Chemistry: help please

    What is the millimolar solubility of oxygen gas,O2, in water at 20 degree celsius, if the pressure of oxygen is 1.00atm?

    asked on February 1, 2009
  16. Social Studies

    Hi Jiskha!! I have been researching the Civil war and wanted to know it you can add to this. No this is not my work it is essays and summary's i found on the computer, this is what I found: Summary of the Civil War: Fought 1861-1865, the American Civil War

    asked on November 10, 2010
  17. English

    Read the following passage "I don't know anything," he said, "except that I'm beginning to be sorry we bought that room for the children. If children are neurotic at all, a room like that -" "It's supposed to help them work off their neuroses in a

    asked on May 2, 2016
  18. Algebra 2

    The formula A = 180(n-2)/n relates to the measure A of an interior angle of a regular polygon to the number of sides n. If an interior angle measures 120 degrees, find the number of sides A)5 B)6 C)8 D)10 I have NO clue on how to do this pls help. Make A

    asked on July 15, 2007
  19. physics

    A tetherball leans against the smooth, frictionless post to which it is attached.The string is attached to the ball such that a line along the string passes through the center of the ball. The string is 1.20m long and the ball has a radius of 0.120mwith

    asked on February 27, 2008
  20. Elementary Statistics

    1) Construct a confidence interval of the population proportion at the given level of confidence. x=60,n=300, 99% confidence. The 99% confidence interval is (_,_) 2) A researcher wishes to estimate the proportion of adults who have high-speed internet

    asked on June 6, 2012
  21. physics

    An Astronaut on the Moon drops a rock straight downward from a height of 1.25 meters. If the acceleration of gravity on the Moon is 1.62 meters per second squared, what is the speed of the rock just before it lands?

    asked on October 1, 2011
  22. college algebra

    The height of an object thrown upward with an initial velocity of 96 feet per second is given by the formula h = -16t2 + 96t, where t is the time in seconds. How long will it take the object to reach a height of 144 feet?

    asked on September 22, 2010
  23. physics

    A motorcycle stunt rider must jump a 100m wide canyon given a 20° ramp positioned on either side. What minimum speed is required so the rider will clear the canyon?

    asked on October 17, 2010
  24. Physics

    Liz rushes down onto a subway platform to find her train already departing. She stops and watches the cars go by. Each car is 8.60 m long. The first moves past her in 1.75 s and the second in 1.17 s. Find the constant acceleration of the train. I know how

    asked on October 10, 2009
  25. Physics

    The command module orbited at an altitude of 110 km above the lunar surface. How much time did it take for the command module to complete one orbit?

    asked on July 20, 2019
  26. Math

    The Coffee Counter charges ​$11.00 per pound for Kenyan French Roast coffee and ​$15.00 per pound for Sumatran coffee. How much of each type should be used to make aa 24 pound blend that sells for ​$13.00 per​ pound?

    asked on January 22, 2018
  27. Algebra

    You operate a gaming Web site, where users must pay a small fee to log on. When you charged $3 the demand was 520 log-ons per month. When you lowered the price to $2.50, the demand increased to 780 log-ons per month. (a) Construct a linear demand function

    asked on February 21, 2012
  28. college algebra

    Use point-slope form to write the equation of the line with the given properties. Write the equation in standard form. m is undefined passing through P(-7, -7)

    asked on October 13, 2010
  29. physics

    It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.20 GPa). As one goes deeper and deeper in the ocean, the pressure increases by 1.0*10^4 Pa for every meter below the surface. If a diver goes down 33.0 m (a bit

    asked on April 13, 2008
  30. Chemistry

    Calculate the wavelengths: -A muon (a sub particle with the mass of 1.884 X 10^-25g) traveling at 320.0 m/s -an electron (me=9.10939 x 10^-28g) moving at 3.85 x 10^6 m/s -An 83.0kg athlete running a "4 minute mile" (i.e. 400min/mile)

    asked on March 31, 2019
  31. Math

    A corporation has 7 members on its board of directors. How many different ways can it elect a president, vice president,secretary, and treasurer?

    asked on July 29, 2013
  32. Trig

    Two ships leave a harbor at the same time. One ship travels on a bearing S11 degrees W at 12 mph. The second ship travels on a bearing N75 degrees E at 9 mph. How far apart will the ships be after 3 hours?

    asked on June 29, 2018
  33. Chemistry

    A pediatrician prescribes the antibiotic amoxicillin to treat a child suffering from an ear infection. The prescribed dose is to be 72.1 mg of drug per kilogram patient body mass per day. The drug is to be administered twice each day in the form of a

    asked on September 19, 2017
  34. Physics

    A man of mass 75 kg lies on a bed of 10,000 nails. The tip of each nail has an area of 1.0 square millimeter. What pressure does the man experience? [g=10 N/kg]

    asked on April 12, 2014
  35. physics

    In the javelin throw at a track-and-field event, the javelin is launched at a speed of 35.0 m/s at an angle of 33.7 ° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes.

    asked on January 26, 2012
  36. physics

    a bullet of mass of 12 grams is fired into a large block of mass 1.5 kg suspended from light vertical wires. the bullet imbeds in the block and the whole system rises 10 cm. find the velocity of the bullet just before the collision.

    asked on June 28, 2010
  37. Physics

    A rock climber hangs freely from nylon rope that is 16 m long and has a diameter of 8.1 mm. If the rope stretches 4.2 cm, what is the mass of the climber?

    asked on August 3, 2019
  38. American history

    Which event led to congress declaring war against mexico? A. The siege of the Alamo B. The Whitman massacre C. The Thornton affair D. The bear flag revolt is it A?

    asked on January 8, 2019
  39. Physics

    A uniform bar length of 2.0m and weight 1000 N has its center of gravity at its center. The bar is pivoted 0.5m from the right, and supports a weight of 200N on the opposite end (left end). What is the weight needed at right end of the bar to balance the

    asked on April 11, 2014
  40. Physics

    The Lamborghini Murcielago can accelerate from 0 to 27.8 m/s (100 km/hr or 62.2 mi/hr) in a time of 3.40 seconds. How fast will the car be traveling (m/s) after 5.1 seconds.

    asked on February 22, 2014
  41. organic chemistry isomers

    which of the following molecules has a conformational isomer? CHCH CH2CH2 CH3CH2CH2CH3 CH2CCCH2 I think its either 2 or 4 but leaning towards 4. I just need help being more confident in my answer.

    asked on April 26, 2013
  42. chemistry

    a liter of a solution saturated at 25C with CaC2O4 is evaporated to dryness giving a 0.0061 gm residue of CaC2O4. Calculate the concentrations of the ions, and the molar solubility and the solubility product constant for this salt at 25C. Show the balanced

    asked on June 10, 2012
  43. physics

    There are two blocks connected by a string and tied to a wall on an incline. The mass of the lower block is 1.0kg; the mass of the upper block is 2.0kg. Given that the angle of the incline is 31*, find the tension in (a) the string connecting the two

    asked on October 2, 2011
  44. Chemistry

    Calculate the solubility of silver iodide in a 1.0 M sodium cyanide solution. Ksp = 8.5 x 10^-17 for AgI Kform = 2.5 x 10^5 for Ag(CN)2

    asked on April 7, 2010
  45. Chemistry

    An alpha particle (mass 6.6 x 10^-24 grams) emitted by radium travels at 3.4 x 10^7 plus or minus 0.1 x 10^7 mi/h. (a) What is its de Broglie wavelength (in meters)? (b) Whats uncertainty in its position? for part (a) I got 1.53 meters which said it was

    asked on March 5, 2010
  46. chemistry

    what are the symmetry elements for: cis-CoCl2(NH3)4 and trans-CoCl2(NH3)4 would it be C2 S2?

    asked on February 25, 2009
  47. physics

    According to one set of measurements, the tensile strength of hair is 196 MPa, which produces a maximum strain of 0.400 in the hair. The thickness of hair varies considerably, but let's use a diameter of 50.0 u(mu)m . What is the magnitude of the force

    asked on April 18, 2008
  48. physics

    A thin, light string is wrapped around the rim of a 4.00kg solid uniform disk that is 30.0cm in diameter. A person pulls on the string with a constant force of 100N tangent to the disk. Find the linear acceleration of its center of mass. If the disk is

    asked on April 12, 2008
  49. Math(check)

    1)Find the range of the relation [(-1,4)},(2,5),(3,5)}.Then determine whether the relation is a funtion. 4,5,5 is the range 4,5 is a function 2)Find f(-1),if f(x)= x^2-6x/x+2 (-1)^2-6(-1)/-1+2 1+6/-1+2 7/1 =7 3)Find f(a),if f(t)= 2t^2-t-2. 2(a)^2-a-2

    asked on July 26, 2007
  50. Calculus

    For an object whose velocity in ft/sec is given by v(t)=2sin(t),what is its distance,in feet, travelled on the interval t=1 to t=5?

    asked on January 27, 2019
  51. Trig

    The magnitude and direction of two forces acting on an object are 100 pounds, S79degreesE, and 60 pounds N68degreesE, respectively. Find the magnitude, to the nearest tenth of a pound, and the direction angle, to the nearest tenth of a degree, of the

    asked on July 1, 2018
  52. math

    Suppose you put $2000 in a savings account at an APR of 8% compounded quarterly. Fill in the table below. (Calculate the interest and compound it each quarter rather than using the compound interest formula. Round your answers to the nearest cent.) Quarter

    asked on October 24, 2017
  53. Calculus

    Find all values of x if any where the tangent line to the graph of the given equation is horizontal? y= x - sqrt (x) I am very confused would I work it like this? y = x - x^-1/2 then set x = 0? Please explain. thank you!

    asked on October 2, 2014
  54. English

    "I watched Hassan get raped," I said to no one. Baba stirred in his sleep. Kaka Homayoun grunted. A part of me was hoping someone would wake up and hear, so I wouldn't have to live with this lie anymore. But no one woke up and in the silence that followed,

    asked on December 2, 2012
  55. Physics

    Relative to the ground, a car has a velocity of 14.8 m/s, directed due north. Relative to this car, a truck has a velocity of 24.0 m/s, directed 52.0° north of east. What is the magnitude of the truck's velocity relative to the ground?

    asked on January 26, 2012
  56. Physics

    A 210 g air-track glider is attached to a spring. The glider is pushed in 12.0 cm against the spring, then released. A student with a stopwatch finds that 13 oscillations take 16.0 s. Find the spring constant k.

    asked on January 21, 2011
  57. Physics

    A massless spring of constant k = 91.0 N/m is fixed on the left side of a level track. A block of mass m = 0.50 kg is pressed against the spring and compresses it a distance of d. The block (initially at rest) is then released and travels toward a circular

    asked on November 4, 2010
  58. algebra

    simplify: square root of 5 + square root of 20 - square root of 27 + square root of 147. simplify: 6/4square root of 2 sqrt 5 + sqrt 20 - sqrt 27 + sqrt 147 = sqrt 5 + sqrt (4*5) - sqrt (3*9) + sqrt (49*3) = 3 sqrt 5 - 3 sqrt 3 + 7 sqrt 3 = 3 sqrt 5 + 4

    asked on August 3, 2007
  59. algebra

    1)Simplify:(6x^3-16x^2+11x-5)/(3x-2) answer= 2x^2-4x+1-3over3x-2 2)Factor 27x^3-1 completley. answer= (3x-1)^3 if this isnt correct,im not sure how to solve it b/c this makes the most sense to me. 3)Simplify: x^2-3x-28 over x^2-9x+14,assume that the

    asked on August 2, 2007
  60. Stats

    Running times for 400 meters is usually distributed for young men between 18 and 30 years of age with a mean of 93 seconds and a standard deviation of 16 seconds. What percent of runners with finish after 110 minutes?

    asked on April 17, 2019
  61. Chemistry please help!

    Calculate (triangle)H for the following gas-phase reaction: 2 H-C (3dashes) C-H + 5 O=O --> 4 O=C=O = 2 H-O-H -Using bond energies

    asked on April 5, 2017
  62. Chemistry

    Iron (III) Oxide reacts with Aluminum to form Aluminum Oxide and Iron. If I have 255 g of Aluminum and unlimited Iron (III) oxide, how many grams of Iron will form? I am really not sure how to work with this. What does it mean when it says that the iron is

    asked on January 21, 2017
  63. Microeconomics

    If the price elasticity of demand is 2, this means that a __________ increase in price causes a __________ decrease in quantity demanded. A. 15%; 100% B. 15%; 10% C. 20%; 40% D. 30%; 20% answer B 15%, 10%

    asked on April 19, 2015
  64. physics

    A softball player hits the ball and starts running towards first base. Draw a motion diagram, using the particle model, showing her position and her average velocity vectors for the first few seconds of her run.

    asked on August 30, 2013
  65. statistics

    Consider a normal distribution with mean 20 and standard deviation 3. What is the probability a value selected at random from this distribution is greater than 20?

    asked on May 12, 2013
  66. grammar English

    I am writing about interviewing Deaf Persons for my ASL research paper. The first person is Christian DeGuzman. He is profoundly deaf since birth, and about 2 or 3 years old later they found out that he was deaf that’s why. Christian grew up in Bay Area,

    asked on April 6, 2013
  67. College Physics 1

    A mass is oscillating on a spring with a period of 4.60s. At t=0s the mass has zero speed is at x=8.30cm. What is the value of t the first time after t=0s that the mass is at x=4.15 cm?

    asked on November 28, 2012
  68. Chemistry

    A bottle of wine contains 11.4% ethanol by volume. The density of ethanol (C2H5OH) is 0.789 g/cm3. Calculate the concentration of ethanol in wine in terms of mass percent and molality.

    asked on September 23, 2012
  69. Physics

    You shoot an arrow into the air. 2.oo seconds later the arrow has gone straight upward to a height of 30 meters above its launch point. (a) What was the arrow's initial speed? (b) How long did it take for the arrow to first reach a height of 15 meters

    asked on October 1, 2011
  70. science

    What mass of water, in grams, would have to be decomposed to produce 26.3 L of molecular oxygen at STP?

    asked on May 3, 2011
  71. Language Arts

    In this sentence: I held it back and managed a squeaky "yes" in response. How would you correctly punctuate the yes part?

    asked on April 13, 2011
  72. Maths

    Two polygons have te number of their sides in the ratio 1:3.The sums of their interior angles are in the ratio of 4;1. Find the number of sides of each polygon.

    asked on February 7, 2011
  73. Math

    What is the range of y= -(x-2)^2+2 ?

    asked on December 31, 2011
  74. college physics

    There are four charges, each with a magnitude of 2.0uC. Two are postive and two are negative. The charges are fixed to the corners of a 3.0m square, one to each corner, in such a way that the net force on any charge is directed toward the center of the

    asked on September 17, 2009
  75. college physics

    Two small spheres, each with mass m=3g and charge q, are suspended from a point by threads of length L=0.22m. What is the charge on each sphere if the threads make an angle theta of 15 degrees with the vertical?

    asked on September 17, 2009
  76. history HHHEEELLLPPP!!!

    What is the society and environment of the coastal plains?

    asked on October 9, 2008
  77. physics

    In a rescue, the 64.0 kg police officer is suspended by two cables,the cable on the left made a 35 degree angle, the rope on the right made a 48 degree angle. What is the tension in the left cable? Find the tension in the right cable.

    asked on February 27, 2008
  78. MATH

    HHHHHEEEEEELLLLLLLPPPPPPPP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Find the y intercepts of these please: 1. The slope is: 6/2...3/1...3 2. The slope is: 10/2... 3. The slope is: 2/2...2 4. The slope is: 2/2...2 The formula for a slope intercept is: y = mx +

    asked on May 24, 2007
  79. Math

    The graph shown represents the equation y=3x- 9 Which equation also represents the line drawn on the graph? I just need help on this, can someone please explain how to break this question down? Thank you!

    asked on February 4, 2020
  80. Chemistry

    The reaction of 5.25 g of Carbon with excess O2 yields 10.2 g of CO2. What is the percent yield of this reaction?

    asked on February 20, 2019
  81. Trig

    a. Find the magnitude of the force required to keep a 3100​-pound car from sliding down a hill inclined at 5.7° from the horizontal. b. Find the magnitude of the force of the car against the hill.

    asked on July 14, 2018
  82. Trig

    The angular speed of a point on a planet is 3pi/7 radian per hour. The equator lies on a circle of radius approximately 9000 miles. Find the linear​ velocity, in miles per​ hour, of a point on the equator.

    asked on June 2, 2018
  83. Math

    Jill said that an angle is made of any to rays is she correct explain

    asked on February 27, 2018
  84. Math

    The length of the top of a work bench is 5 m greater than the width. The area is 66 m^2. Find the length and the width.

    asked on February 3, 2018
  85. Chem

    Suppose a runner completes a 10K (10.0 km) road race in 42 minutes and 15 seconds. What is the runner's average speed in miles per hour?

    asked on September 17, 2017
  86. Chemistry

    The spectrophometer was used to measure the absorbance of each of a series of [FeSa]+ solutions. A standard curve was construnceted by plotting the absorbance vs. concentration (M). The slope and y-intercept were found to be 1496 M-1 and .003,

    asked on April 2, 2017
  87. Chemistry

    Given the reaction: Fe2SiO4 (s) + 2 H2CO3 (aq) ---> 2 FeCO3 (s) + H4SiO4 (aq) how many grams of Fe2SiO4 (s) are required to completely react with 55.0 mL of .500 M H2CO3 (aq) ?

    asked on March 8, 2017
  88. Chemistry

    We will calculate the amount of acid to use in each titration. Assume that you are using 0.0512 M NaOH(aq). A good volume of NaOH(aq) to use per titration is 15 mL. From this molarity and volume, the moles of NaOH can be calculated. Since the unknown acid

    asked on February 8, 2017
  89. Chemistry

    The balanced equation for the synthesis of water is: 2H2 + O2 > 2H2O If I have 5.5 grams of water, at least how many grams of Oxygen gas was needed?

    asked on January 21, 2017
  90. Geometry

    Carlos is making cookies. The recipe calls for 1 cup of sugar for every 3 cups of flour. Carlos has only 2 cups of flour. How much sugar should Carlos use?

    asked on January 18, 2017
  91. Math 160

    The position function of an object moving along a straight line is given by s = f(t). The average velocity of the object over the time interval [a, b] is the average rate of change of f over [a, b]; its (instantaneous) velocity at t = a is the rate of

    asked on September 3, 2016
  92. English

    Against which American value did the Beat generation of writers react? equality freedom individualism traditionalism***

    asked on May 2, 2016
  93. science

    the density of an object with a volume of 60.0 mL and a mass of 400.0g is___? a. 0.150g/mL b. 2.89g/mL c. 5.50 g/mL or d. 6.67 g/mL

    asked on March 17, 2016
  94. Math

    Find the number of the sides of a regular polygon, if the measure of one of its exterior angle is between 28 and 32.

    asked on October 3, 2014
  95. Math

    If the measure of an interior angle of a regular polygon is 165, find the sum of the measures of its interior angles

    asked on October 3, 2014
  96. Math

    The sum of the measures of four of the angles of a heptagon is 520. Two of the remaining three angles are congruent. The other remaining angle is 3/2 the measure of one of the two congruent angles. Find the measures of the remaining angles.

    asked on October 3, 2014
  97. Math

    1. Victor brought a brand new car for 750,000. IF the value of the car depreciates 20% per year, what will it be worth during the fourth year? 2. Given the terms a10 = 3/512 and a15 = 3/16384 of a geometric sequence, find the exact value of the first term

    asked on October 3, 2014
  98. physics

    A net force of 5.34 N acting for 4.23 s on a mass initial at rest, causes it to travel 4.75 m in a straight line. What is the mass?

    asked on October 2, 2014
  99. Calculus

    I am so lost, I have no idea what to do next. Find the equation of the tangent line to the graph at the indicated point f(x) =x^2 +x ; a=-1 I started out using f(-1)= (-1+h)-(-1)/h but i am so lost on what to do next. I have tried to look at examples in

    asked on September 25, 2014
  100. Physics

    You throw a ball downward from a window at a speed of 3.6 m/s. What will the speed of the ball be immediately before hitting the sidewalk 8.3 m below?

    asked on February 26, 2014


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