Most popular questions and responses by Lindsay
  1. chemistry! URGENT

    A standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepared by dissolving 10.0 mg of fluoxymestrone in enough water to give a total volume of 500.0 ml. A 100.0 micro liter aliquot

    asked on December 7, 2011
  2. Math

    Find the value of x if line QS bisects angle PQR and measure of angle PQR equals 82 degrees. angle PQS=10x+1

    asked on October 30, 2016
  3. Physics

    A robot probe drops a camera off the rim of a 239 m high cliff on Mars, where the free-fall acceleration is -3.7 m/s^2. a) Find the velocity with which the camera hits the ground. b) Find the time required for it to hit the ground. Ok so I'm not even sure

    asked on September 25, 2007
  4. Chemistry

    Choose the true statements regarding the charge-minimized Lewis structure(s) of the BrO2- ion. (selet all that apply) a. There is only one charge-minimized structure for this ion. b. There are two charge-minimized resonance structures for this ion. c. The

    asked on October 5, 2008
  5. Physics

    A bus travels 280 km south along a straight path with an average velocity of 88 km/hr to the south. The bus stops for 24 min, then it travels 210 km south with an average of 75 km/hr to the south. A. How long does the total trip last? B. What is the

    asked on September 10, 2007
  6. Physics

    A long thin rod of mass M = 2:00 kg and length L = 75:0 cm is free to rotate about its center as shown. Two identical masses (each of mass m = .403 kg) slide without friction along the rod. The two masses begin at the rod's point of rotation when the rod

    asked on December 24, 2011
  7. Calculus (check my work)

    The measurement of the circumference of a circle is found to be 64 centimeters, with a possible error of 0.9 centimeter. Approximate the percent error in computing the area of the circle. MY ANSWER 8.83%

    asked on December 17, 2013
  8. Calculus

    The total stopping distance T of a vehicle is T=2.5x+0.5x^2 where T is in feet and x is the speed in miles per hour. Approximate the change and percent change in total stopping distance as sped changes from x=25 to x=26 miles per hour. I started taking the

    asked on December 17, 2013
  9. English

    Ebenezer Scrooge’s character changes between Act 1 and Act 2 of A Christmas Carol: Scrooge and Marley. In an essay, describe these changes and analyze how events in the plot shape Scrooge’s character. Include details from the text in your essay.

    asked on May 28, 2018
  10. Chem help!!

    A rock salt (NaCl), ice, and water mixutre is used to make homemade ice cream. How many grams of rock salt must be added to lower the freezing point 10.0 degrees C? I have no idea what to do, please help! delta T = Kf*i*m delta T = 10. Kf is the molal

    asked on May 3, 2007
  11. Physics

    A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.51s after the ball is released from his hands. What is the speed of the ball? The speed of sound

    asked on August 30, 2013
  12. Math

    The first row of a concert hall has 25 seats and each row after the first has one more seat than the row before it. There are 2 rows of seat. 1)Write a rule for the number of seats in the nth row. 2)35 students from a class want to sit in the same row. How

    asked on March 2, 2010
  13. Physics

    A quarterback claims that he can throw the football a horizontal distance of 183 m (200 yd). Furthermore, he claims that he can do this by launching the ball at the relatively low angle of 35° above the horizontal. To evaluate his claim, determine the

    asked on February 9, 2011
  14. Astronomy

    If you lived on Mars, which planets would describe retrograde loops? Which would never be visible as crecent phases?

    asked on March 17, 2008
  15. Chemistry

    How much Ba(OH)2 is needed to neutralize 3.2 moles of H2SO4 and 4.5 moles of HCl mixed together in 755 mL of water?

    asked on October 24, 2010
  16. Physics

    An airplane of mass 2180 kg located 131 km north of U is ying 272 km/hr in an easterly direction. (a) What is the magnitude of the angular momentum (kg m2/s) with respect to U? (b)what is the angular momentum with respect to U?

    asked on December 23, 2011
  17. Physics

    A steam engine's boiler completely converts 155 kg of water to steam. This process involves the transfer of 3.5 x 10^8 J by heat. If steam escaping a safety valve does 1.76 x 10^8 J of work against the outside atmosphere, what is the net internal energy of

    asked on March 26, 2008
  18. Ochem

    A student needed to determine the percent composition of a mixture that contained fluorene and benzoic acid. The student took 283 mg of the mixture and used the extraction method to separate the components. Then both compounds were recrystallized and

    asked on October 19, 2011
  19. math

    The 9th term of an AP is 8 and the 4th term is 20. Find the first term and the common difference.

    asked on April 6, 2013
  20. Physics

    A regulation volleyball court is L = 18.0 m long and a regulation volleyball net is d = 2.43 m high. A volleyball player strikes the ball a height h = 1.76 m directly above the back line, and the ball's initial velocity makes an angle q = 55° with respect

    asked on November 8, 2007
  21. Physics

    A stone is thrown vertically upward with a speed of 19.0m/s How fast is it moving when it reaches a height of 10.0m

    asked on August 29, 2013
  22. Physics

    A star with the same mass and diameter as the sun rotates about a central axis with a period of about 29.2 days. Suppose that the sun runs out of nuclear fuel and collapses to form a white dwarf star with a diameter equal to that of the earth. Assume the

    asked on December 23, 2011
  23. Physics II

    A large cylindrical water tank 11.5 m in diameter and 13.5 m tall is supported 8.75 m above the ground by a stand. The water level in the tank is 10.6 m deep. The density of the water in the tank is 1.00 g/cm3. A very small hole is formed at the base of

    asked on January 18, 2015
  24. Calculus (check my answer)

    The measurement of the edge of a cube is found to be 15 inches, with a possible error of 0.03 inch. Use differentials to approximate the maximum possible propagated error in computing the surface area of the cube. I got 5.4 inches squared. Is this right?

    asked on December 17, 2013
  25. calculus

    Simplify the following power functions to the form y=kxp, where k and p are some numbers. (a) y=(18)/x√ is y=kxp. What are k and p?

    asked on February 5, 2015
  26. math

    The sum of the first 20 terms of an arithmetic series is identical to the sum of the first 22 terms. If the common difference is -2, find the first term.

    asked on July 17, 2014
  27. Physics

    A flea pulls on a puck with force 7 microN at an angle of 30°. Another flea pulls on the puck with force 2 microN at an angle of -60°. a) What is the magnitude of the net force on the puck? (I got 7.28 uN) b)At what angle is the net force? ( I got about

    asked on January 13, 2008
  28. Physics. Really stuck!

    two blocks of masses m1 and m2 (m1>m2) are placed on a frictionless table in contact with each other. A horizontal force of magnitude F is applied to the block of mass m1. if P is the magnitude of the contact force between the blocks, what are the net

    asked on October 8, 2012
  29. math

    An A.P. is given by k,2k/3,k/3, 0,... Find the 6th term.

    asked on July 22, 2014
  30. physics

    The drawing shows an equilateral triangle, each side of which has a length of 4.53 cm. Point charges are fixed to each corner, as shown. The 4.00 C charge experiences a net force due to the charges qA and qB. This net force points vertically downward and

    asked on June 17, 2014
  31. Physics

    A basketball player, standing near the basket to grab a rebound, jumps 73.6 cm vertically. How much time does the player spend in the bottom 15.4 cm of the jump? Ok...after this I swear I'm done! I just need someone to check my final answer, which is

    asked on October 10, 2007
  32. Geometry

    Find the point, M, that divides segment AB into a ratio of 3:2 if A is at (0, 15) and B is at (20, 0).

    asked on September 17, 2016
  33. Calculus (check my answers)

    10) Use the information to evaluate and compare delta y and dy. y=2-x^4, x=2 and delta x=dx=0.01 MY ANSWER: dy=-.32 and delta y=-.3224. Are they supposed to be negative, and how do I compare those in words? I don't even understand what I was supposed to

    asked on December 17, 2013
  34. Calculus

    The measurements of the base and altitude of a triangle are found to be 36 and 50 centimeters, respectively. The possible error in each measurement is 0.25 centimeter. Use differentials to approximate the possible propagated error in computing the area of

    asked on December 16, 2013
  35. chemistry

    When zinc metal is reacted with hydrochloric acid, zinc chloride and hydrogen gas are produced. If 16.4 ml of 2.14 M HCl are used: a) how many grams of zinc metal are needed to completely use up the acid? b) What will be the molarity of the aqueous

    asked on December 7, 2011
  36. chemistry

    Write the expression for Kc and Kp for the reaction PH3BCl3(s) PH3(g) + BCl3(g)

    asked on March 8, 2012
  37. math

    a woman's long jump record is about 1 1/6 the distance of the 15-16-year-old girl's record of 20 13/14 feet. find the distance of the women's record to the nearest foot

    asked on January 9, 2019
  38. Physics

    A car traveling at a constant speed of 125 km/hr passes a trooper hidden behind a billboard. One second after the speeding car passes the billboard, the trooper sets in a chase after the car with a constant acceleration of 2.7 m/s^2. How far does the

    asked on January 13, 2008
  39. Physics

    A basketball player, standing near the basket to grab a rebound, jumps 73.6 cm vertically. How much time does the player spend in the top 15.4 cm of his jump? I never know which formula to use for these problems! Any help will be greatly appreciated.

    asked on October 9, 2007
  40. Chemistry

    In the synthesis of asprin we react salicylic acid (HOOCC6H4OH) with acetic anhydride (C4H6O3) . The unbalanced chemical equation is: HOOCC6H4OH + C4H6O3 --> HOOCC6H4O2C2H3 + H2O If we mix together 28.2 g of salicylic acids with 15.6 g of acetic anhydride

    asked on September 24, 2017
  41. Physics

    A regulation volleyball court is L = 18.0 m long and a regulation volleyball net is d = 2.43 m high. A volleyball player strikes the ball a height h = 1.76 m directly above the back line, and the ball's initial velocity makes an angle q = 55° with respect

    asked on November 12, 2007
  42. Physics

    A bullet with a mass m = 4:83 g and initial speed of 330 m/s passes through a wheel which is initially at rest as in the The wheel is a solid disk with mass M = 2.29 kg and radius R = 1.:6 cm. The wheel rotates freely about an axis through its center and

    asked on December 25, 2011
  43. Physics !

    Sound enters the ear, travels through the auditory canal, and reaches the eardrum. The auditory canal is approximately a tube open at only one end. The other end is closed by the eardrum. A typical length for the auditory canal in an adult is about 2.6 cm.

    asked on January 26, 2010
  44. statistics

    A survey was conducted to measure the number of hours per week adults spend on home computers. In the survey, the number of hours was normally distributed, with a mean of 8 hours and a standard deviation of 1 hour. A survey participant is randomly

    asked on November 7, 2011
  45. Physics

    A model rocket is launched straight upward with an initial speed of 50 m/s. It accelerates with a constant upward acceleration of 2.00 m/s^2 until its engines stop at an altitude of 150 m. a) What is the max. height reached by the rocket? b) When does the

    asked on September 30, 2007
  46. physics

    The electron in a certain hydrogen atom has an angular momentum of 6.834 × 10-34 J·s. What is the largest possible magnitude for the z component of the angular momentum of this electron? For accuracy, use h = 6.626 × 10-34 J·s. I know you need to use

    asked on July 23, 2014
  47. physics

    a metal ball with a charge of 5.4x10^8 electrons is touched to another metal ball so that all the excess electrons are shared equally. What is the final cahrge on the first ball?

    asked on June 7, 2012
  48. statistics

    A sales firm receives an average of four calls per hour on its toll-free number. For any given hour, find the probability that it will receive exactly eight calls

    asked on August 3, 2011
  49. Physics

    A lead ball, with an initial temperature of 25.0oC, is released from a height of 96.0 m. It does not bounce when it hits a hard surface. Assume all the energy of the fall goes into heating the lead. Find the temperature (in degrees C) of the ball after it

    asked on March 30, 2008
  50. Physics

    A snowball is launched horizontally from the top of a building at v = 15 m/s. If it lands d = 44.5 meters from the bottom, how high (in m) was the building? For this problem, do I need to solve for any other velocities? I'm a little stuck...I'm not quite

    asked on November 2, 2007
  51. algebra

    Find 1.The first 4 terms of the binomial expansion in ascending powers of x of (1+x/4)^8. 2.Use your expansion to estimate (1.025)^8

    asked on July 22, 2014
  52. trigonometry

    Find the general solution for f(x) = 27 tan^2 x-9=0

    asked on April 23, 2012
  53. Physics

    An artillery shell is fired with an initial velocity of 300m/s at 55.0 degrees above the horizontal. To clear an avalanche, it explodes on a mountainside 42.0s later. What are the x and y coordinates of the shell where it explodes, relative to its firing

    asked on October 9, 2012
  54. Physics

    A golf ball released from a height of 1.80 m above a concrete floor, bounces back to a height of 1.06 m. If the ball is in contact with the floor for 4.62 ms, what is the magnitude of the average acceleration a of the ball while it is in contact with the

    asked on October 4, 2007
  55. Physics/ Chem

    Find the entropy change when 51g of steam condenses to water at 100 ∘C.

    asked on April 22, 2014
  56. math

    Four bottles of water and 3 bagels cost $10.94. At the same prices, 3 bottles of water and 6 bagels cost $11.28. Find the price per bottle of water and the price per bagel.

    asked on April 15, 2019
  57. Physics

    The Wall of Death in an amusement park is comprised of a vertical cylinder that can spin around the vertical axis. Riders stand against the wall of the spinning cylinder and the floor falls away leaving the riders held up by friction. The radius of the

    asked on December 15, 2007
  58. math

    a species of orchid is being studied. The population 'p' at time 't' years after the study started is assumed to be p = 2800ae^0.2t/1 + ae^0.2t where 'a' is a constant. Given tnat there were 300 orchids when the study started. a. show that a =0.12 b. use

    asked on March 18, 2013
  59. Economics

    We're looking at the market for cat food. When the price is $10, the quantity sold is 1000 bags. When the price drops 10%, the quantity sold increases 30%. Calculate the price elasticity of demand. (Answer in format X.XX, round to the nearest hundredth.) I

    asked on February 25, 2013
  60. math

    A paperweight containing liquid is made up of a cone and a cylinder. The radius of the cone is 3cm with height of 4cm. The diameter is 20cm and height is 8cm. 1. Calculate the total volume of the cone and cylinder when it si empty, leaving your answer in

    asked on November 29, 2012
  61. Physics

    A railroad flatcar is loaded with crates. The coefficient of static friction between the crates and the floor is 0.27. If the train is moving at 59.7 km/hr, in how short a distance can the train be stopped with a constant acceleration without causing the

    asked on December 5, 2007
  62. Physics

    A research balloon of total mass 200 kg is descending vertically with a downward acceleration of 3.2 m/s^2. How much ballast must be thrown from the car to give the balloon an upward acceleration equal to 2.8 m/s^2, presuming that the upward lift of the

    asked on November 28, 2007
  63. Stastics

    Can someone help me and let me know if what I have solved is correct. A researcher randomly surveyed 300 high school seniors and determined 225 stated they drive a car to high school. We are interested in the population proportion of seniors who drive a

    asked on April 24, 2016
  64. Physics

    A stone is thrown vertically upward. On its way up it passes point A with speed v, and point B, 12.6 m higher than A, with speed v/2. Calculate the maximum height reached by the stone above point B. What equation can I use to get the maximum height?

    asked on October 5, 2007
  65. English

    Would lonely or isolated be considered character trait

    asked on November 11, 2014

    A car is safely negotiating an unbanked circular turn at a speed of 29 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a long wet patch in the road decreases the maximum static frictional force to one-ninth of its

    asked on October 2, 2012
  67. Physics

    A hockey puck is sliding across a frozen pond with an initial speed of 6.5 m/s. It comes to rest after sliding a distance of 7.6 m. What is the coefficient of kinetic friction between the puck and the ice? I know this one is not that difficult. However, I

    asked on December 5, 2007
  68. trigonometry

    a ship travels 8km due north then 7km on a bearing of 070 degrees 1. draw a diagram to represent the information 2. calculate the distance and bearing of the ship from its starting point

    asked on April 21, 2012
  69. trigonometry

    given triangle ABC with AB=7cm, BC=8cm and AC=9cm calculate 1. the size of the largest angle 2. the area of the triangle

    asked on April 21, 2012
  70. Physics

    A small steel ball bearing with a mass of 24 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.23 m. Calculate the horizontal distance the ball will travel if the same spring is

    asked on November 4, 2007
  71. math

    Dave walked from point A to point B due North East for a distance of 20m. He immediately changed direction and walked 50m from B to C on a bearing of 110 degrees. i. Calculate the distance AC ii. Find the bearing of C from A

    asked on May 21, 2013
  72. Physics

    A railroad flatcar is loaded with crates. The coefficient of static friction between the crates and the floor is 0.27. If the train is moving at 59.7 km/hr, in how short a distance can the train be stopped with a constant acceleration without causing the

    asked on December 1, 2007
  73. Physics

    At the instant a traffic light turns green, a car starts moving with a constant acceleration a of 3.05 m/s^2. At the same time a truck, traveling with a constant speed of 10.15 m/s, overtakes and passes the car. How far beyond the traffic light will the

    asked on October 8, 2007
  74. math

    a cyclist travels the 30 km from Town A to Town B at an average speed of 25 km/h and immediately continues the journey to town C, which is a further 60 km away at an average speed of 20 km/h. What is the average speed for the whole journey?

    asked on November 23, 2012
  75. Physics

    A railroad flatcar is loaded with crates. The coefficient of static friction between the crates and the floor is 0.27. If the train is moving at 59.7 km/hr, in how short a distance can the train be stopped with a constant acceleration without causing the

    asked on December 2, 2007
  76. Physics

    A helicopter is flying in a straight line over a level field at a constant speed of 21.7 m/s and at a constant altitude of 11.5 m. A package is ejected horizontally from the helicopter with an initial speed of 21.6 m/s relative to the helicopter, and a

    asked on November 4, 2007
  77. Physics

    It takes 2.5 s for a small ball released from rest from a tall building to reach the ground. The mass of the ball is 0.05 kg. Calculate the height from which the ball is released. Ok so I have the time, initial velocity, and the acceleration. But the mass

    asked on October 9, 2007
  78. Calculus

    Y=5x^4 -24x^3+24x^2+17 is concave down for which interval? A) x0 C) x-2/5 D) x2 E) 2/5 < x < 2 I know you take the second derivative...but I keep getting stuck with something that won't factor right?

    asked on December 9, 2013
  79. physics

    a square with side length 2.0 cm has a charge of -1.0x10^-6C at every corner. What is the magnitude and direction of the electric force on each charge? What is the force on a fifth charge placed in the centre of this square? Does the sign of the fifth

    asked on June 7, 2012
  80. Math

    A vet surveys 26 of his patrons. He discovers that 14 have dogs. 10 have cats. 5 have fish. 4 have dogs & cats. 3 have dogs & fish. 1 has a cat & a fish. Use a diagram to answer the following question: If no one has all 3 kinds of pets, how many patrons

    asked on March 3, 2010
  81. Chemistry II

    When dissolved in water, ammonium phosphate would have a value of __________ for i solute.

    asked on September 9, 2009
  82. physics

    Given that the distancef rom Earth to the Moon is 3.8 x 10^8 m, that the Moon takes 27 days to orbit Earth, and that the mass of the Moon is 7.4 x 10^22 kg, what is the acceleration of the Moon and the size of the attractive force between Earth and Moon?

    asked on September 18, 2006
  83. physics

    A 58.4-kg person, running horizontally with a velocity of +3.84 m/s, jumps onto a 10.7-kg sled that is initially at rest. (a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away. (Indicate the

    asked on October 22, 2012
  84. Chemistry

    Draw the condensed structural formula for the products of the acid hydrolysis of the following amide with HCl: CH3-CH2-C(=O)-NH2 + H2O + HCl ---> I'm afraid I don't even know where to begin with this one, help!

    asked on November 24, 2010
  85. Mathmatics

    I want to be able to have $50,000 a year during retirement. I want to make sure that I can have it until I am 100 years old. I plan to retire at 65. I can earn 6%. How much do I need to have at retirement to be able to make it?

    asked on August 18, 2015
  86. spanish

    This is on demonstrative adjectives and are fill in the blanks. ____ pantolones son bonitos y el precio no es muy alto. Si, las dos cosas son geniales. Tambien me gustan ____ sueteres que estan cerca de ti. ?De que talla es _____ sueter negro, el de solo

    asked on January 19, 2012
  87. Physics

    Calculate the position of the center of mass of the following pairs of objects. Use a coordinate system where the origin is at the center of the more massive object. Give your answer not in meters but as a fraction of the radius as requested. Get data from

    asked on December 15, 2011
  88. Physics

    A 850.0-kg car travelling on a level road at 27.0 m/s (60.5 mi/hr) can stop, locking its wheels, in a distance of 61.0 m (200.1 ft). (a) Find the size of the horizontal force which the car applies on the road while stopping. (b) Find the stopping distance

    asked on December 5, 2007
  89. Physics

    A bicyclist accelerates -0.87 m/s/s during a 3.8 s interval. What is the change in velocity of the bicyclist and the bicycle? For this problem, I used the formula 'change in v = a x t" and came up with -3.306 m/s as my answer. Is this right?

    asked on September 13, 2007
  90. Chemistry

    In a titration experiment 34.12 mL of 0.902 M KOH is reacted with H2SO4. The endpoint is reached when 50.46 mL of the acid is mixed with the base. What is the molar concentration of the acid? I'm having a hard time even starting this problem, since I don't

    asked on May 24, 2007
  91. Chemistry

    A 63 gram block of an unknown metal at 88 degrees C was dropped into an insulated flask containing approx. 30 g of ice and 30 g of water at 0 degrees C. After the system had reached a steady temp. it was determined that 12.1 g of ice had melted. What is

    asked on May 15, 2007
  92. trigonometry

    solve the equation: 4 tan^2 x + 12 sec x +1 =0, for 0 degrees is less than or equal to x is less than or equal to 360 degrees.

    asked on May 1, 2012
  93. Physics

    At the entrance channel of a harbor, the tidal current has a velocity of 4.94 km/hr in a direction 23.2° south of east. Suppose a ship caught in this current has a speed of 15.6 km/hr relative to the water. If the helmsman keeps the bow of the ship aimed

    asked on October 18, 2007
  94. Physics

    A basketball player, standing near the basket to grab a rebound, jumps 73.6 cm vertically. How much time does the player spend in the bottom 15.4 cm of the jump? I need someone to check my work. I got about 3.797 as the inital velocity. I plugged this into

    asked on October 10, 2007
  95. Algebra

    Could you explain to me how to these type of problems? I checked in my book and it is still confusing. Evalute the piecewise function at the given value of the independent variable. 1. g(x)= {x^2+2 if x cannont equal 2, x+8 if x=2 Determine g(-5). 2. f(x)

    asked on August 30, 2007
  96. Stats.

    Another one that I need help.... At Ajax Spring Water, a half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process standard deviation of 4 ml. (a) Which sampling

    asked on April 23, 2014
  97. trigonometry

    A sector AOB of a circle, centre O, radius r cm, where the acute angle AOB is theta radians. Given that the perimeter of the sector is 14 cm and that the area of the sector is 10 cm^2, evaluate r and theta.

    asked on March 8, 2013
  98. math

    1.John deposited $40,000.oo in the bank and earned simple interest of 7% per annum for 2 years. calculate the amount he will receive at the end of the 2 year period. 2. Find the simple interest on $15,000.00 invested for 4 years at 12% per annum.

    asked on November 12, 2012
  99. Physics

    A jet is circling an airport control tower at a distance of 23.0 km. An observer in the tower watches the jet cross in front of the moon. As seen from the tower, the moon subtends an angle of 9.49 10-3 radians. Find the distance traveled (in meters) by the

    asked on October 22, 2012
  100. physics

    to start a nuclear fusion reaction, two hydrogen atoms of charge 1.602x10^-19 and mass 1.67x10^-27kg must be fired at each other. If each particle has an initial velocity of 2.7x10^6m/s when released, what is their minimum seperation?

    asked on June 11, 2012


  1. 1
  2. 2
  3. 3
  4. 4
  5. 5