1. Physics

    The displacement of a standing wave on a string is given by D=3.6sin(.54x)cos(37t), where x and D are in centimeters and t is in seconds. What is the distance in cm between the nodes in centimeters? Give the amplitude of each of the component waves,

    asked by Tay on November 17, 2009
  2. Physics

    An unknown mass of a certain solid, initially at 60⁰C, is heated at a uniform at a uniform rate. After 4.0 min the solid reaches its melting point of 80⁰C, and it remains at that temperature for 3.0 min until completely melted. After a further 6.0 min

    asked by John Carlo on July 4, 2016
  3. Pre-calculus

    Given the following values for f(t): t : f(t) 3 : -7 6 : 6 9 : 19 12 : 6 15 : -7 18 : 6 a) What is the period, frequency, midline, amplitude, maximum, and minimum? b)Find a possible formula for f(t) c)Find the domain and range of f(t) d)Find a formula for

    asked by Elle on March 26, 2009
  4. Physics

    A person places the speakers 4.0 m apart and connects a signal generator to both speakers that produces a single and consistent tone. (constant wavelength and frequency) He then walks to a point that is 2.0 m from one speaker and 2.3 m from the other. At

    asked by Ann on December 13, 2010
  5. Physics

    A person places the speakers 4.0 m apart and connects a signal generator to both speakers that produces a single and consistent tone. (constant wavelength and frequency) He then walks to a point that is 2.0 m from one speaker and 2.3 m from the other. At

    asked by Ann on December 13, 2010
  6. Chemistry

    A is a solution of trioxonitrate (V) acid. HNO of unknown concentration B is standard solution of sodium hydroxide containing 4.00g per dm3 of solution 25cm3 portion solution B required an average of 24.00cm3 of solution A for neutralization. Using 2 drop

    asked by EMMANUEL on June 6, 2018
  7. college physics HELP

    A vertically oriented spring stretches 0.2m when a 0.4kg mass is suspended from it. The mass is pulled, stretching the spring by an additional 0.15m. The mass is released and beings to oscillate in SHM. a)Calculate the spring constant for the spring.

    asked by siobhan on April 25, 2017
  8. Music Physic

    The trombone's low B flat 2 is played with the slide in first position. What is its effective length, that is the length of an idealized closed tube with the same second mode frequency? Estimate how far the slide should be moved to reach second position in

    asked by AAA on April 19, 2012
  9. physic

    9. A 2.00-kg object is attached to a spring and placed on a frictionless, horizontal surface. A horizontal force of 20.0 N is required to hold the object at rest when it is pulled 0.200 m from its equilibrium position (the origin of the x axis). The object

    asked by Ika Diana on June 29, 2013
  10. Chemistry

    A snorkeler takes a syringe filled with 16 mL of air from the surface, where the pressure is 1.0 ATM, to an unknown depth. The volume of the air in the syringe at this depth is 7.5 mL. What Is the pressure at this depth? If the pressure increases by an

    asked by Monique on October 14, 2011
  11. physics

    A block of mass m=.75kg is fastened to an unstrained horizontal springwhose spring constant is 82 N/m. The block is given a displacement of +.12m, where + sign indicates that the displacement is along the +x axis, and then released from rest. Find the

    asked by Anonymous on February 19, 2008
  12. physics

    A glider on an air track is connected by springs to either end of the track. Both springs have the same spring constant,k , and the glider has mass M. A)Determine the frequency of the oscillation, assuming no damping, if k= 125N/m and M= 250g. (I got the

    asked by kelsi on May 25, 2009
  13. Science

    What is the relationship between the frequency of a light wave and its energy and the relationship between the wavelength of a light wave and it's energy?

    asked by Mariz on October 11, 2008
  14. Science Help!

    A student mixed two clear liquids together in a beaker. A solid and a new liquid formed. The student forgot to write down the mass of one of the reactansts. The rest of the data are shown in the table below. Table Mass (g) Liquid reactant A/ unknown Liquid

    asked by Callie on November 12, 2014
  15. Chemistry

    Question: A solution of H2X of unknown concentration is given. pH of the solution is 4. ka1=2*(10)^-6 M ka2=1*(10)^-11 M Find the concentrations of [H2X] ,[HX-] and X^2- in the solution. My thoughts on the question: The temperature which the solution is

    asked by Shenaya on May 31, 2017
  16. simple harmonic motion

    So I have the following information: Amplitude (A)=1.60mm, Angular Velocity (w)=2760 and phase constant (o) = pi/2. and I need to find: a)the period of oscillation. b)maximum speed. c)max magnitude of acceleration. Firstly I dont want anyone to give away

    asked by Anon on October 9, 2017
  17. physics

    A box is suspended by a steel wire via a frictionless pulley The wire has a mass per length of µ = 24.5 × 10 − 3 kg/m. The box is so heavy and the wire so thin that the mass of the wire does not influence the wire tension. The horizontal part of the

    asked by Nick on April 16, 2015
  18. Math

    Really stuck on this question not sure where im going wrong a trapezium with top and bottom sides paralell. With a diagonal line running from the top left to the bootom right hand corner splitting the trapez into two triangles. the top left corner angle is

    asked by Evie on February 3, 2014
  19. Science

    1. Which of the following statements about mechanical waves is true? a. mechanical waves require a medium to travel through b. mechanical waves do not have amplitude and wavelength c. mechanical waves do not have frequency d. mechanical waves can travel

    asked by Thank you! on May 14, 2018
  20. chemistry

    need to calculate the mass (m ) of NaoH with C% = 15 % , to balance 176 g of H2SO4 so i though to use this method C% = mass of h2s04 / mass of h2so4 + mass of Naoh which is unknown mass of Naoh = c% x mass of h2so4 / 100 is this the right method or not ?

    asked by auro on March 18, 2011
  21. chemistry

    need to calculate the mass (m ) of NaoH with C% = 15 % , to balance 176 g of H2SO4 so i though to use this method C% = mass of h2s04 / mass of h2so4 + mass of Naoh which is unknown mass of Naoh = c% x mass of h2so4 / 100 is this the right method or not ?

    asked by auro on March 18, 2011
  22. Physics

    If an object on a horizontal frictionless surface is attached to a spring, displaced, and then released, it will oscillate. If it is displaced a distance 0.130 m from its equilibrium position and released with zero initial speed. Then after a time 0.803 s

    asked by Hadi on January 2, 2007
  23. Physics

    The following values are the only allowable energy levels of a hypothetical one-electron atom: E6 = =2 X 10^-19 J E5 = -7 X 10^-19 J E4 = -11 X 10^-19 J E3 = -15 X 10^-19 J E2 = -17 X 10^-19 J E1 = -20 X 10^-19 J A) If the electron were in the n = 3 level,

    asked by Vea on January 24, 2010
  24. Physics

    A sinusoidal wave is traveling on a string with speed 30.00 cm/s. The displacement of the particles of the string at x = 15 cm is found to vary with time according to the equation y = (5.0 cm) sin[1.5 - (3.0 s-1)t]. The linear density of the string is 5.0

    asked by Kyle on December 3, 2011
  25. George School

    Ag2CrO4(s) + 2e- 2Ag(s) + CrO42-(aq) A chemist wishes to determine the concentration of CrO42- electrochemically. A cell is constructed consisting of a saturated calomel electrode (SCE; which has a reduction potential of 0.242 V relative to the SHE) and a

    asked by Daniel on May 20, 2008
  26. Electrochemistry

    Ag2CrO4(s) + 2e- 2Ag(s) + CrO42-(aq) A chemist wishes to determine the concentration of CrO42- electrochemically. A cell is constructed consisting of a saturated calomel electrode (SCE; which has a reduction potential of 0.242 V relative to the SHE) and a

    asked by Daniel on May 20, 2008
  27. Physics (please help!!!!)

    The mass m = 14 kg shown in the figure is displaced a distance x to the right from its equilibrium position. (Take k1 = 113 N/m and k2 = 198 N/m.) (a) What is the net force acting on the mass? (Use any variable or symbol stated above along with the

    asked by HELP! on April 24, 2011
  28. physics

    Two very long, straight, parallel wires carry currents that are directed perpendicular. Wire 1 carries a current I1 into the page (in the -z direction) and passes through the x axis at x = +a. Wire 2 passes through the x axis at x = -2a and carries an

    asked by Rachel on April 9, 2011
  29. Physics

    A musician plays the middle C note (262 Hz) on a guitar, a piano, and a violin at the same loudness. Will all three instruments produce exactly the same sound? Why or why not explain. Frequency (262Hz) is the same so that means that the pitch of the sound

    asked by Andrea on March 1, 2008
  30. social problems

    Dr.Rivera and Dr. Harris want to conduct research to determine whether training prisoners in computer skills during incarceration will reduce recidivism.The researchers plan to compare a group of prisoners who received the training with a group that did

    asked by vedrana on February 22, 2011
  31. Biology

    In general, the frequency of APs in an afferent neuron is related to the amplitude of the receptor potential in the following way: a. exponentially. b. there is no general relationship. c. logarithmically. d. linearly. Is it exponentially? The other

    asked by Alex on January 6, 2010
  32. Health (Ms. Sue Check Please)

    1.Kori's doctor says her muscular strength and endurance are excellent, but he worries about Kori's cardiovascular health. Kori enjoys weightlifting, softball, basketball, and bowling. Increasing the frequency of which activity will best improve Kori's

    asked by Bobby Newberry on May 24, 2017
  33. FINANCE

    Tim recently invested $3,500 in a project that is promising to return 10.75 percent per year. The cash flows are expected to be as follows: End of Cash Year Flow 1 $750 2 800 3 ??? 4 950 Note that the 3rd year cash flow is unknown. Assuming the present

    asked by Kevin on October 22, 2009
  34. PHYSICS

    Sally Sue, an enthusiastic physics student enjoyed the opportunity to collect data from standing waves in a spring. She and her partner help the ends of their spring 4.00 meters apart. There are 5 nodes in the standing wave produced. Sally moved her hand

    asked by Katie on April 19, 2011
  35. Physics

    SEQUENCE of questions: 1)A typical steel B-string in a guitar resonates at its fundamental frequency at 240 Hertz. The length of the string is 0.620 m. What is the wave velocity along the string? Find your answer in m/s MY ANSWER 148.8m/s? 2)The tension in

    asked by Jamie on March 31, 2011
  36. finance

    John Keene recently invested $3,500 in a project that is promising to return 10.75 percent per year. The cash flows are expected to be as follows: End of Cash Year Flow 1 $750 2 800 3 ??? 4 950 Note that the 3rd year cash flow is unknown. Assuming the

    asked by Peter on October 23, 2009
  37. Math help ms sue.

    1. What is 57% of 11? (1 point) 11 = 0.57 • n; 19.3 n = 57 • 11; 627 n = 0.57 • 11; 6.27 11 = 57 • n; 0.19 2. 224 is 25% of what number? (1 point) 224 • 0.25 = w; 560 224 = 0.25 • w; 896 224 • 0.25 = w; 56 224 = 0.25 • w; 90 3. Explain how

    asked by josh on January 12, 2014
  38. physic

    The waves emitted from a source A is given by y1 = 6 sin π(20t – 0.5x) where y1, x and t are expressed in units of meter and seconds. (a) Determine the wavelength and the frequency of the radio waves. At the same time, source B generates waves y2 that

    asked by niti on September 5, 2012
  39. English

    Hello again. Will you please help me with a few more questions? 1)Which word order is correct: a)he was accused of taking bribes by his colleagues or b) he was accused by his colleagues of taking bribes? 2)Do you think it's possible to say: "there are good

    asked by Ilma on February 13, 2013
  40. Math

    1. What is 57% of 11? (1 point) 11 = 0.57 • n; 19.3 n = 57 • 11; 627 n = 0.57 • 11; 6. 27 11 = 57 • n; 0.19 2. 224 is 25% of what number? (1 point) 224 • 0.25 = w; 560 224 = 0.25 • w; 896 224 • 0.25 = w; 56 224 = 0.25 • w; 90 3. Explain how

    asked by FluttershyK22 on October 4, 2016
  41. Socials Studies (URGENT) #2

    Alright, for my children's story on life in New France. This is what I have so far. --------------------------------------- Little Jon-Jon was exploring his backyard. He saw a tunnel that wasn't there before. He crawled right in.... ...and came out the

    asked by Larry on March 26, 2009
  42. Physics

    Dolphins of the open ocean are classified as Type II Odontocetes (toothed whales). These animals use ultrasonic "clicks" with a frequency of about 54.9 kHz to navigate and find prey. a. Suppose a dolphin sends out a series of high-pitched clicks that are

    asked by Jon on April 11, 2010
  43. chemistry

    an unknown element crystallizes in a face-centered cubic unit cell. with an edge length of 392.4 pm. The solid has a density of 21.09 g/cm^3. what is atomic weight of solid? so what i did was : FC cubic uit --> 4 atoms edge length--> l = 2*root2*r = 392.4

    asked by Ania on November 8, 2012
  44. Chemistry

    An unknown compound contains only carbon, hydrogen, and oxygen. Combustion analysis of the compound gives mass percents of 31.57% Carbon and 5.30% H. The molar mass is determined by measuring the freezing-point depression of an aqueous solution. A freezing

    asked by James on February 24, 2015
  45. Physics

    In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth.

    asked by Geek on July 30, 2011
  46. AP Physics

    A ladder of unknown length and mass of 29 kg rests on a rough floor, and leans against a rough wall. The coefficient of static friction between the ladder and both the floor and wall are 0.68. Hanging on the ladder are two masses. The first mass is 9.9 kg

    asked by Mary on December 4, 2010
  47. math

    Gather a set of data. Choose a small sample, between 10 and 20 pieces of data, and a simple value to measure, such as the ages of visitors in a park, or the number of text messages each person in your family receives in one day. Choose a display for your

    asked by Drew on March 25, 2015
  48. chemistry

    A is a solution of trioxonitrate(v) acid, HNO3, of unknown concentration. B is standard solution of sodium hydroxide containing 4.00g per dm3 of solution. 25cm3 portions solution B required an average of 24.00cm3 of solution A for neutralization, using

    asked by oward on May 24, 2016
  49. physics

    A 100 g aluminum calorimeter contains 250 g of water. The two substances are in thermal equilibrium at 10°C. Two metallic blocks are placed in the water. One is a 50 g piece of copper at 79°C. The other sample has a mass of 83 g and is originally at a

    asked by Kelsey on April 28, 2010
  50. statistics

    3 different drugs are under consideration for trating a given ailment. in the past 10,000 applications, drug A was sed 2500 times, drug B 4000 times, and drug C 3500 times. when an expert was asked to rank the effectiveness of the 3 drugs, he replied:

    asked by Albert on November 12, 2009
  51. Geometry

    On one side of a scale there are 6 coins, 3 weighing 2 grams each and 3 weighing x grams each. The scale is balanced if 5 coins weighing x grams each are placed on the other side of the scale. How much does each of the unknown coins weigh? Answer in units

    asked by Chitra on November 27, 2009
  52. physics

    A dad pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 16 rpm in 11.5 s. Assume the merry-go-round is a uniform disk of radius 3.0 m and has a mass of 790 kg, and two children (each with a

    asked by brooke on June 21, 2012
  53. Physics

    An engineer has an odd-shaped object of mass 16 kg and needs to find its rotational inertia about an axis through its center of mass. The object is supported on a wire along the desired axis. The wire has a torsion constant κ = 0.4 N· m. If this torsion

    asked by Shane on April 15, 2015
  54. Chemistry

    1. Consider a 1.00g unknown sample that contains 62.0% sodium carbonate and 38.0% sodium bicarbonate, NaHCO3, by mass. When this sample is dissolved in water, how many mL of 0.200M HCl will be required to convert all of the carbonate to bicarbonate? How

    asked by Mia on February 26, 2014
  55. Physics

    A sine wave is traveling to the right on a cord. The lighter line in the figure represents the shape of the cord at time t = 0; the darker line represents the shape of the cord at time t = 0.10 s. (Note that the horizontal and vertical scales are

    asked by Amy on April 17, 2012
  56. Physics

    A person standing close to a railroad crossing hears the whistle of an approaching train. He notes that the pitch of the whistle drops as the train passes by and moves away from the crossing. The frequency of the distant approaching whistle is 540 Hz; it

    asked by Emily on December 7, 2012
  57. Algebra

    A hanging spring is compressed 3 inches from its rest position and released at t = 0 seconds. It returns to the same position after 0.8 seconds. I need help Finding: a) the amplitude of the motion b) the period of the motion c) the frequency of the motion

    asked by Anonymous on May 25, 2018
  58. Chemistry-Dr.Bob

    An unknown piece of metal weighing 100. g is heated to 90.0 degrees Celcius. It is dropped into 250 g of water at 20.0 degrees Celcius. When equilibrium is reached, the temperature of both the water and piece of metal is 29.0 degrees Celcius. Determine the

    asked by Sanaya on January 9, 2016
  59. physics

    A light ray parallel to the optical axis of a glass sphere of radius R enters the sphere at height H above the axis (H

    asked by crystal on April 6, 2011
  60. Math "Need Help Asap"!

    Multiple Choice Use an equation to solve the problem. 1. What is 57% of 11? (1 point) 11 = 0.57 • n; 19.3 n = 57 • 11; 627 n = 0.57 • 11; 6.27 11 = 57 • n; 0.19 2. 224 is 25% of what number? (1 point) 224 • 0.25 = w; 560 224 = 0.25 • w; 896 224

    asked by #FreeGucci on May 27, 2016
  61. Intro. Physics!!!

    1------- A -10 uC charge is placed 0.20 m away from an unknown charge. The force between the two charges is found to be attractive and has a value of 9.0 N. What is the magnitude and sign of the other charge? 2-------- A -5 uC charge is a distance of 12 cm

    asked by Anonymous on January 24, 2015
  62. Physics doppler effect

    A person standing close to a railroad crossing hears the whistle of an approaching train. He notes that the pitch of the whistle drops as the train passes by and moves away from the crossing. The frequency of the approaching whistle is 523 Hz, and drops to

    asked by Joan on May 16, 2011
  63. business statistics

    It has been reported that 10.3% of U.S. households do not own a vehicle, with 34.2% owning 2 vehicles, and 17.1% owning 3 or more vehicles. The data for a random sample of 100 households in a resort community are summarized in the frequency distribution

    asked by Lesliam on August 12, 2009
  64. business statistics

    It has been reported that 10.3% of U.S. households do not own a vehicle, with 34.2% owning 2 vehicles, and 17.1% owning 3 or more vehicles. The data for a random sample of 100 households in a resort community are summarized in the frequency distribution

    asked by Lesliam on August 12, 2009
  65. Physics

    A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 2.15 × 104 m/s (Va) and the radius of the orbit is 5.15 × 106 m (ra). A second satellite also has a circular orbit around this same planet. The orbit of this second

    asked by Bex on October 5, 2016
  66. physics

    John is listening to a horn. He knows the frequency of the horn is 300 Hz when both he and the horn are at rest. If he hears a pitch of 330 Hz, there are clearly several possibilities. For each of the following statements, indicate whether it is correct or

    asked by Joan on May 16, 2011
  67. Help me!, Physics

    A 60g piece of ice at an intial temperature that is unknown is placed into a glass of 250g of water sitting at room temperature when it is 80 degrees F in the room. The glass and ice come up thermal equilibrium at 4 degrees Celsius. What is the original

    asked by Jazzy on January 15, 2013
  68. Statistics

    The table I have is: Color of Candy Frequency Proportion (as a fraction and decimal) Percentage Red 13 13/100 or .13 13% Orange 25 25/100 or .25 25% Yellow 8 8/100 or .08 8% Brown 8 8/100 or .08 8% Blue 27 27/100 or .27 27% Green 19 19/100 or .19 19%

    asked by Destiny Park on July 13, 2015
  69. English

    Let me not to the marriage of true minds Admit impediments, love is not love Which alters when it alteration finds, Or bends with the remover to remove. O no, it is an ever-fixed mark That looks on tempests and is never shaken; It is the star to every

    asked by Death on May 13, 2019
  70. social studies

    Let me not to the marriage of true minds Admit impediments, love is not love Which alters when it alteration finds, Or bends with the remover to remove. O no, it is an ever-fixed mark That looks on tempests and is never shaken; It is the star to every

    asked by TheMainKain on March 5, 2019
  71. business statistics

    It has been reported that 10.3% of U.S. households do not own a vehicle, with 34.2% owning 2 vehicles, and 17.1% owning 3 or more vehicles. The data for a random sample of 100 households in a resort community are summarized in the frequency distribution

    asked by Lesliam on August 12, 2009
  72. Physics

    A 21.0-kg satellite has a circular orbit with a period of 2.37 h and a radius of 8.50×106 m around a planet of unknown mass. If the magnitude of the gravitational acceleration on the surface of the planet is 7.10 m/s2, what is the radius of the planet?

    asked by winterWX on February 16, 2007
  73. Chemistry Really Confused!!

    'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon with the remainder hydrogen.

    asked by Lina on January 16, 2016
  74. Chemistry

    I'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon with the remainder hydrogen.

    asked by Lina on January 16, 2016
  75. U.S. History

    Compare and contrast the initial formation of two states—Virginia and Pennsylvania—by evaluating and listing the similarities and differences of the first state constitution for each state. •Identify the date of each constitution and consider the

    asked by John on March 22, 2010
  76. US History

    Compare and contrast the initial formation of two states—Virginia and Pennsylvania—by evaluating and listing the similarities and differences of the first state constitution for each state. Identify the date of each constitution and consider the events

    asked by Chris on August 18, 2010
  77. physics

    Four people, each with a mass of 72.7 kg, are in a car with a mass of 1110 kg. An earthquake strikes. The driver manages to pull of the road and stop, as the vertical oscillations of the ground surface make the car bounce up and down on its suspension

    asked by tom on October 16, 2010
  78. Physics

    A mass m = 13 kg is connected to two different springs, one on the left and another on the right. It is displaced a distance x to the right from its equilibrium position. (Take k1 = 115 N/m and k2 = 198 N/m.) (a) What is the net force acting on the mass?

    asked by Bruce on July 13, 2012
  79. Physics

    Obi-Wan lands his spacecraft on an unknown planet. Visibility is poor, so he isn't able to exactly determine on which planet he has landed. He finds someone on a local communications channel and asks for directions to Earth. "You are already on Earth," is

    asked by Megan on September 21, 2014
  80. physics

    suppose the force of 20.0 N pushes on two boxes of unknown mass. We know, however, that the acceleration of the boxes is 1.25 m/s2 and the contact force has a magnitude of 2.73 N. (a) Find the mass of box 1. (b) Find the mass of box 2. So do I subtract the

    asked by Alex on October 11, 2014
  81. Physics

    (1) body is taken to depth of 32km below the surface of the earth. Calculate the percentage decrease in the weight of the body at this depth (The radius of the earth is 6400km) (2)A wire of mass per unit length 5.0gm-1 is stretched between 2 points 30cm

    asked by matrixxavier on July 26, 2008
  82. physics question, trombone?

    A trombone player stands at the end zone (x = 0) of a football field and begins to play its fundamental tone. Assume the trombone is a half open tube that is 3m long. How much would the trombone player have to move the slider in cm to play 25 Hz? I

    asked by tyger2020 on February 23, 2018
  83. Physics help

    Fortune tellers use crystal balls to see the future. A fortune teller has a crystal ball with an index of refraction of 1.5 and diameter of 0.2 m. You sit on one side of the ball and the fortune teller sits on the other. She holds up a small red jewel on

    asked by SOmebody on May 23, 2013
  84. Math

    Jungle Jim owes three debts: $500 due in one year plus interest at 6% compounded semi-annually, $2000 due in two years, $1000 due in three years plus interest at 5% compounded monthly. He wishes to discharge these debts by paying $500 now and two equal but

    asked by Anonymous on January 20, 2014
  85. math

    Jungle Jim owes three debts: $500 due in one year plus interest at 6% compounded semi-annually, $2000 due in two years, $1000 due in three years plus interest at 5% compounded monthly. He wishes to discharge these debts by paying $500 now and two equal but

    asked by MathHelp on March 14, 2014
  86. PHYSICS

    A block of mass m = 0.889 kg is fastened to an unstrained horizontal spring whose spring constant is k = 89.4 N/m. The block is given a displacement of +0.128 m, where the + sign indicates that the displacement is along the +x axis, and then released from

    asked by Anonymous on November 17, 2015
  87. phyics

    A block of mass m = 0.510 kg is fastened to an unstrained horizontal spring whose spring constant is k = 85.3 N/m. The block is given a displacement of +0.112 m, where the + sign indicates that the displacement is along the +x axis, and then released from

    asked by MATT on November 12, 2013
  88. Physics

    Life scientists use ultracentrifuges to separate biological components or to remove molecules from suspension. Samples in a symmetric array of containers are spun rapidly about a central axis. The centrifugal acceleration they experience in their moving

    asked by Emilia on June 15, 2012
  89. Physics

    A spring id vertically, as shown below, and a 500g mass is hung from its lower end. The EQUILIBRIUM extension of the spring is observed to be 10.0cm. (1) What is the spring constant of the spring? A: 49N/m (B) If the is pulled down by 5.00cm and released,

    asked by Melissa on August 4, 2011
  90. Physics

    A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 31.0 m above sea level, directed at an angle q above the horizontal with an unknown speed v0. a. The projectile remains in

    asked by Anonymous on November 5, 2009
  91. Statistics

    QUESTION 1 Use the following scenario and data for all the questions The lives of Lithium batteries used in a type of cell phones are normally distributed with an unknown standard deviation. A simple random sample of equation batteries is selected. The

    asked by Neyra on October 31, 2017
  92. english grammar

    Johari Window can you use for apply for yourself. The Johari Window is a simple graphic model that shows how you see yourself, how other people see you, what you hide for other people and the complete unknown. Johari Window learns you express your feeling,

    asked by popely q on December 20, 2011
  93. Science

    A piece of unknown metal with a mass of 68.6 grams is heated to an initial temperature of 100 Celsius and dropped into 42 grams of water with an initial temperature of 20 Celsius in a calorimeter the final temperature of the system is 52.1 Celsius the

    asked by Raven on September 18, 2016
  94. chemistry

    Calculate the Molarity of the unknown acid if 25.0 mL of the acid reacts with 17.50 mL of 0.14 M NaOH solution. Assume that NaOH and acid react in 1:! ratio. Show your work. (Hint: Find the moles of NaOH from the given molarity and volume. mols of NaOH =

    asked by shosho on March 16, 2016
  95. science

    In an experiment to determine the solubility of lead chloride (PbCl2), 5.6g of (NH4)2SO4 was added to a 250ml solution containing an unknown amount of dissolved lead chloride (PbCl2) resulting in the formation of Lead sulfate precipitate. The mass of the

    asked by nelo on July 27, 2014
  96. physics wave

    A) Show that the average rate with which energy is transported along a cord by a mechnical wave of frequency f and amplitude D is: P(average) = 2(pi^2)u v(f^2)(D^2) v is speed of the wave u is the mass per unit length (M/L) B) If the cord is under a

    asked by Anonymous on May 1, 2008
  97. Physics

    A solenoid has N=1760.0 turns, length d=40 cm , and radius b=0.4 cm, (bL/R) after S1 is closed? . (d) How much energy (in J) is stored in the magnetic field of the coil a very long time (t>>L/R) after S1 is closed? For the next part, assume that a very

    asked by Anonymous on May 23, 2013
  98. Math

    There was a berry picking contest at the earth day celebration this year. The line plot below shows the number of pints of berries collected by the people participating in the contest. a. What is the median of the data displaced on the line plot? b. How

    asked by Ciera Rue on March 10, 2016
  99. Physics

    You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.15 m. a) determine frequency of these water waves in units of Hz?? b) determine the period of these water waves in units of s. ?? c) determine

    asked by Bob on February 24, 2009
  100. physics

    A block of mass m = 0.605 kg is fastened to an unstrained horizontal spring whose spring constant is k = 67.5 N/m. The block is given a displacement of +0.120 m, where the + sign indicates that the displacement is along the +x axis, and then released from

    asked by twill on June 8, 2014