1. College Physics

    A 7 kg mass hangs on a 10 meter long weightless cord. To the nearest cm, what should the new length of the pendulum be in order that the new frequency be 1.8 times its current value? The correct answer is 309 but I got 250. Heres what I did.. (1/2pi)(sqrt
  2. marhs

    A wheel is free to rotate about its fixed axle. A spring with constant k = 290 N/m is attached to one of its spokes a distance r = 23 cm from the axle, as shown in the figure. (a) Assuming that the wheel is a hoop of mass m = 490 g and radius R = 0.97 m,
  3. Physics

    A copper rod (length = 1.3 m, radius = 3.70 10-3 m) hangs down from the ceiling. A 8.3-kg object is attached to the lower end of the rod. The rod acts as a "spring", and the object oscillates vertically with a small amplitude. Ignoring the rod's mass, find
  4. Physics

    Assume the length of an organ pipe is L=24cm. You have excited the wave in the tube, and you observe that it has displacement nodes at 4cm, 12cm, and 20cm measured from one end of the pipe. In which harmonic, n, is the air in the pipe oscillating? What is
  5. science

    which of the following describe radio waves. Along wavelength with high frequency, b long wave length with short frequencies or low wave length with low frequencies
  6. Physics

    A 5000-Hz car horn is blasted while the car is moving at 35.0 m/s toward a dazed physics student (stationary). What is the frequency of the horn heard by the student. Assume the temperature is 0°C
  7. Chemistry

    A metal whose threshold frequency is 1.10×1015 s−1 emits an electron with a velocity of 6.53×105 m/s when radiation of 1.37×1015 s−1 strikes the metal. What is the mass of the electron?
  8. physics

    Low E on a guitar vibrates at 82.4 Hz and the guitar is 62.8 cm long. How long would the same string have to be to vibrate at high E 329.6 Hz. Assume that both strings vibrate at the fundamental frequency for the string.
  9. Language Arts

    9. Choose the type of punctuation that is missing from the following sentence. My best friends new dog wont stop barking. (1 point) (x)apostrophe ()semicolon ()colon ()hyphen 10. Cant you just see the look on his face when he finds out about the party. (1
  10. Chem 12

    How can I do this: 3KNO3(aq)+ Fe(SCN)3(aq) + NaOH(aq) <---> ? what do you have to do? write the products it makes. I don't know the products it makes. I have to figure out what adding all those produces. Im not sure its even possible? yes it is
  11. Physics

    A particle leaves the origin with an initial velocity v Overscript right-arrow EndScripts equals left-parenthesis 7.34 i Overscript ̂ EndScripts right-parenthesis m divided by s and a constant acceleration a Overscript right-arrow EndScripts equals
  12. chem

    is NaCl ion dipole, or Ion Ion? my notes say ion ion but online it says ion dipole. Is NaOH2 hydrogen bond or Ion-Dipole? my class notes say ion dipole but it seems, to me, to be h-bond too.
  13. chem

    is NaCl ion dipole, or Ion Ion? my notes say ion ion but online it says ion dipole. Is NaOH2 hydrogen bond or Ion-Dipole? my class notes say ion dipole but it seems, to me, to be h-bond too.
  14. chem

    is NaCl ion dipole, or Ion Ion? my notes say ion ion but online it says ion dipole. Is NaOH2 hydrogen bond or Ion-Dipole? my class notes say ion dipole but it seems, to me, to be h-bond too.
  15. Math

    In a class, the probability that a randomly chosen student likes dogs is 0.72, that a student likes cats is 0.54, and that a student likes neither is 0.11. Find the probability that a student likes both dogs and cats.
  16. chem

    is NaCl ion dipole, or Ion Ion? my notes say ion ion but online it says ion dipole. Is NaOH2 hydrogen bond or Ion-Dipole? my class notes say ion dipole but it seems, to me, to be h-bond too.
  17. Statistics

    A class has 50 students. 13 are juniors, 20 are psych majors, and 24 are neither psych majors nor juniors. How many psych majors are juniors?
  18. Physics

    A class has 50 students. 13 are juniors, 20 are psych majors, and 24 are neither psych majors nor juniors. How many psych majors are juniors?
  19. Math

    Rolando is 61 1/2 inches tall. Marcus is 4 5/8 inches taller than Rolando. How tall is Marcus? A.66 1/8in B. 65 7/8 in C. 65 2/3in D.65 1/8in D Brett asked 20 students in his class which breakfast cereal they prefer. The table shows the results Frosties 12
  20. Chemistry

    The binding energy of electrons in a metal is 194 kJ/mol. Find the threshold frequency of the metal. ----------------- The heat of fusion of ice is 6.00 kJ/mol. Find the number of photons of wavelength = 6.78×10^−6 m that must be absorbed to melt
  21. Physics HELP!!

    The sound intensity of 1.2x10-12J/m2s is the threshold of hearing for humans. What is the amplitude of the motion of the air molecules if the speed of sound in the air is 343m/s and the density of air is 1.28kg/m^3? Take the frequency of the air molecules
  22. physics

    Television sets sometimes use a "rabbit-ears" antenna. A rabbit-ears antenna consists of a pair of metal rods. The length of each rod can be adjusted to be one-fifth of a wavelength of an electromagnetic wave whose frequency is 60.0 MHz. How long is each
  23. Physics

    1)A car is moving with uniform accelaration. It moves along two point A and B and enters with velocity 50 m/s and 80 m/s respectively . Find the velocity when the car is moving in b/w the point A and B. Let t be the time measured from when the velocity is
  24. xacc 280

    If there has been anyone that has taken this class could get a little help. I am not looking for the answers just some more info. I am not understanding it. Instructions For each of the three situations, say if the accounting method used is correct or
  25. Math

    I have a bar graph that shows the number of students by major in the College of Arts and Science. Math shows 200 students History shows 300 students English shows 400 students Science shows 150 students Other shows 175 students What percent of students in
  26. Math

    what kind of math journals, essays, & projects you guys do in 7th grade math??? i'm really curious i saw the grading policy 2 my skool website here is the grading policy for math DISTRICT GRADING POLICY MATHEMATICS -70% FORMAL ASSESSMENTS (Tests, Quizzes)
  27. English

    1.At what time should Jill and Amy's parents pick ___ up after the party? 2.As we approached the house, one of the dogs began to wag ___ tail. 3.Both of the horses jumped over the low fence between ___ coral and the field. 4.If you want to have a dog, you
  28. English

    1. At school, I enjoy chatting with my close friends. 2. At school, I enjoy cleaning with other classmates. 3. At school, I enjoy playing soccer in the playground. 4. At school, I enjoy eating cookies at the school shop. 5. At school, I enjoy playing
  29. Physics

    A ball is attached by two springs as shown in the left figure( |wwOww| ).If the mass is displaced a distance ⊿x below the equilibrium position h. Determine whether vertical SHM is possible for the system shown. If so, find the natural frequency.
  30. History

    Question: How did the policies of the Napoleonic Empire change Europe? A. Napoleon’s expansion policies led to a desire for self-rule throughout Europe. B. Policies of the Napoleonic Empire elevated the education system throughout Europe, which led to
  31. Anyone good with probability??

    Mark, Carrie, Max, and Jane are doing a probability experiment in math class. They flip a coin 200 times and record their results. Heads:120 Tails:80 Question 2 on their lab sheet asks for the theoretical probability of flipping heads. They come up with
  32. English

    Find two people or two things which are equal in some way, and talk about them with your partner using the expression as as. Tom, are you tall? Yes, I am. How tall are you? I am 160 cm tall. (Looking at his partner, Bill) How about you? How tall are you? I
  33. History

    Which best describes the causes of the French Revolution? (Select all that apply.) french aristocrats sought to relinquish power of the papacy in France in order to gain new lands and titles people in France, especially poor and lower classes, had been
  34. English

    I urgently need your help to check these sentences. Thank you. 1) 2) I don't think our school can organize a first meeting so early but I can do my best so that our students will get to know each other very soon. 2) It would be nice if our students could
  35. English

    Could you check if the punctuation is correct? Thank you. 1) Revise last year's summary of the abdridged edition of Daniel Defoe's Robinson Crusoe. (in italics) 2) Read, translate and do the while-reading and post-reading activities of the following
  36. need help

    These are from Spielvogel's "Western Civilization" and are part of a AP European History class: Ch. 10= 1. Compare the political developments in France and England with those in the Holy Roman Empire and Italy. What similarities and differences do you
  37. ASTRONOMY

    Good evening all, I am working on a PowerPoint presentation for my Astronomy class about planet Earth - my question is: What is Earth's brightest apparent magnitude (if it has one)? I have searched every reliable source I know of (and that I come across),
  38. math

    One year, Super Bowl commercial time sold for $4 million for 30 seconds of air time. a) What was the price per second? Round to the nearest cent. b) How much air time could you get that year for three million dollars? Assume that air time could be
  39. math

    There are 5 boys and 4 girls in my class. In how many ways can they be seated in a row of 9 chairs such that at least 2 boys are next to each other? In how many ways can they be seated in a row of 9 chairs such that at least 3 girls are all next to each
  40. Math

    Kate uses a copy machine to enlarge her rectangular design that is 6 inches wide and 8 inches long. The new width is 10 inches long. What is the new length. I got some weird number like 13.333. I multiplied 8 times 10 and divided 80 by 6.
  41. English

    For my english class we have to write a sample cover letter & resume. I already wrote the resume. At the top of the example cover letter in the book it says February 15, 2008 3598 Seal Blvd. Bloomington IN 42167 Edward R. Elwood, Hiring Attorney Booneville
  42. statistics

    I have just a couple questions I have trouble understanding... can someone please help me? The data below indicate the rankings of a set of employees according to class theory and on-the-job practice evaluations: Theory 1 7 2 10 4 8 5 3 6 9 Practice 2 8 1
  43. physics

    a mass is at rest with respect to the lab frame, while a frictionless turntable rotates beneath it. the frequency of turntable is w and mass is located at radius r. In the frame of turntable , find the forces acting on mass and verify that F=ma
  44. Chemistry

    The energy (in joules) of an electron energy level in the Bohr atom is given by the expression: En = -2.179 x 10-18/n2 J where n is the principal quantum number for the energy level. What is the frequency in Hz of the electromagnetic radiation absorbed
  45. physics

    a mass is at rest with respect to the lab frame, while a frictionless turntable rotates beneath it. the frequency of turntable is w and mass is located at radius r. In the frame of turntable , find the forces acting on mass and verify that F=ma
  46. math 2 questions plz help asap

    1) Mr. customs is correcting the class's math homework on customary units. which of the following measurements is reasonable? A. a pencil is 12 feet long B. the back porch is 12 inches wide C. the 3rd hole on the golf court is 123 miles long D. the
  47. Finance

    Can anyone offer help to me by explaining how I can answer this question? The current rate on 5-year T-Notes is 7% and the current rate on 10-year T-Notes is 9%. What should you expect the rate to be on 5-year T-Notes in 5 years? I am not looking for the
  48. music

    I have to write a report for school on the topic of film music. I want to show my class mates how different you feel when you see a movie scene with two different musics. So I was looking for two versions of a scene of any movie. One version should be with
  49. lOTS OF PHYSICS :)

    41. Is the speed of light constant as it passes through transparent materials? Yes, the speed of is always constant No, light travels at different speeds through different materials 42. A lens that causes light to diverge is A converging lens A diverging
  50. 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
  51. Word Problem /Math

    Angel's car gets 32 miles per gallon and Mo's car gets 22 miles per gallon. When traveling from Morgan Run to Clinton, they both used a whole number of gallons of gas. What is the closest that Morgan Run and Clinton could be? How many gallons did Angel's
  52. English

    This is my essay. I was wondering, if its not asking to much if you could edit it for me? or just tell me whats wrong with it? In Pride and Prejudice, Jane Austen tries to change the views of the Regency Era on marriage, class, and reputation through the
  53. Art

    The United States supreme Courts architectural design symbolizes what values that are also shared with Greek culture? A. resistance and persistence B. creativity and love C. tranquility and peace D. balance and justice I feel like it's D or B 2.Realists
  54. English Expressions

    1. She did her part, and the native speaker did her part. They were cooperative and did their parts properly. 2. Teachers should make students say, act out and work together in class. 3. The quality of a teacher's voice is important in teaching. If she
  55. Physics

    While watching ocean waves at the dock of the bay, Otis notices that 10 waves pass beneath him in 30 seconds. He also notices that the crests of successive waves exactly coincide with the posts that are 5 meters apart. What are the period, frequency,
  56. physics

    The frequency of oscillation of the wave emitted by an FM radio station is 80.9 MHz. Find the period of vibration. Radio waves travel at a speed of light; 3 × 10 8 m/s. Answer in units of ns 002 (part 2 of 2) Find the wavelength. Answer in units of m
  57. Wave and Vibrations

    For a particle vibrating simple harmonically, the displacement is 15cm at the instant the velocity is 5cm/sec and the displacement is 8cm at the instant the velocity is 18cm/sec. Calculate i)Amplitude ii) Frequency iii) The time period
  58. physics

    while watching ocean waves at the dock of the bay. otis notices that 10 waves pass beneath him in 30 seconds. he also notices that the crests of succesive waves exactly coincide with the posts that are 5 meters apart. what are the period frequency
  59. math

    A woman is sitting in a boat at anchor on a lake. Her boat bobs up and down once every 2.0·s. She notices that when the front of her 3.0·m long boat is at one wave crest, a second crest is at the middle of her boat, and a third is at the end. What is the
  60. physics

    A car sounds its horn (502 Hz) as it approachs a pedestrian by the side of the road. The pedestrian has perfect pitch and determines that the sound from the horn has a frequency of 520 Hz. If the speed of sound that day was 340 m/s , how fast was the car
  61. American education

    You are a second-grade teacher at Happy Valley Elementary School. You are teaching language arts and social studies. Your classroom of 21 students consists of 7 white students, 5 Latino students, 4 African American students, 3 Native American students, and
  62. math

    My son is doing this in 6th grade math class. Mr. Weiss started painting the kitchen at 8:45 am and finished painting at 12:00 pm. About how many hours elapsed between the time he started painting and the time he finished painting the kitchen? Answers are
  63. Environmental Science

    How is fresh water used in industry? a.in manufacturing processes b.in the disposal of waste products c.to generate power d.all of the above i picked b. I'm no expert on environmental science, but wouldn't it be (d)? I thought that because: a. People use
  64. I have a question concerning Spring Semester

    Im a freshman in college and I just took Chem1, Trig, and Drama (12units). I am planning on taking Chem2, Pre-Calc, and Art1 for spring sem. (13units). I'm not sure if this is too much to take for next semester considering two five unit classes or should I
  65. Ethics

    1. Which of the following would be of greatest concern from an ethical standpoint? A. The number of homicide victims in a given place during a given time period B. The legal elements of the crime of homicide C. Whether capital punishment is a justifiable
  66. Physics - Mini Lab

    The reason I didn't do this was because I was gone the day they did this at school. And the teacher said I couldn't do it at school. So I need help and my teacher is a jerk, so I have no idea what to do. Please help me. I really need a good grade in this
  67. Statistics

    Students were given an exam with 300 multiple-choice questions. The distribution of the scores was normal and mean was 195 with a standard deviation of 30. What were the scores of the students who were within one standard deviation of the mean? What
  68. Physics Help ASAP

    A car horn is pitched at 520 Hz. The car travels along a straight road at a speed of 25 m/s. towards an observer walking at 2 m/. The speed of sound is 334 m/s. Calculate the frequency heard by the observer when: (a) the car is moving towards the observer
  69. physics

    You are watching a marching band practice outdoors. Near you are two trumpet players, one marching directly towards you and one away from you at the same speed. Each trumpet player is playing an A (440 Hz) and you hear a beat between the two sounds at a
  70. Physics

    You are watching a marching band practice outdoors. Near you are two trumpet players, one marching directly towards you and one away from you at the same speed. Each trumpet player is playing an A (440 Hz) and you hear a beat between the two sounds at a
  71. physics

    In an electric shaver, the blade moves back and forth over a distance of 2.0 mm. The motion is simple harmonic, with frequency 118 Hz. (a) Find the amplitude. mm (b) Find the maximum blade speed. m/s (c) Find the magnitude of the maximum blade
  72. physics

    In an electric shaver, the blade moves back and forth over a distance of 2.0 mm. The motion is simple harmonic, with frequency 118 Hz. (a) Find the amplitude. mm (b) Find the maximum blade speed. m/s (c) Find the magnitude of the maximum blade
  73. physics

    A tray is moved horizontally back and forth in simple harmonic motion at a frequency of f = 1.86 Hz. On this tray is an empty cup. Obtain the coefficient of static friction between the tray and the cup, given that the cup begins slipping when the amplitude
  74. Hardy Weinberg: Biology

    Can someone explain how to answer these questions given the different variables given? I have a test soon. Dr. Martin Brenner and his team have built a space ship which can travel at the speed of light (186,000 miles per second) and travel to parallel
  75. algebra

    i forgot to post these! f(x)=9x+4 and listed in interval notation also: f(x) x2+14x+40 in interval notation and: 1/x^2+81 (interval notation) and: x+11/x^2-121 (interval notation) and: f(x+2) f(x)=6x^2-x+7 You have listed a lot of functions but have said
  76. physics

    A vibrator moves one end of a rope up and down to generate a wave. The tension in the rope is 58 N. The frequency is then doubled. To what value must the tension be adjusted, so the new wave has the same wavelength as the old one? would it be doubled?
  77. physics

    A swing is drawn to the side 3m from its equilibrium position and released. The swing is 2m on the other side of the equilibrium position 1.64s later. Find the angular frequency of the SHM.
  78. physics

    A group of swimmers is resting in the sun on an off shore raft. They estimate that 1.1m separates a trough and an adjacent crest of surface waves on the lake. In addition, they count 23 crests that pass by the raft in 15.7seconds. What is the frequency of
  79. Physics

    A stretched string is attached to an oscillator. On which of the following quantities does the wavelength of the waves on the string depend? Select all that apply. The choices are: A) The frequency of the oscillator. B) The tension applied to the string.
  80. physics

    Dolphins ca detect small fish whose size is about equal to the wavelength of the sound the dolphin makes with its echo-location system. A dolphin emits a chirp at a frequency of 220 kHz. Using the speed of water as 1530 m/s, what is the smallest fish this
  81. Physics

    A water wave is generated in a ripple tank by an oscillator that vibrates 50 times in 30 seconds. A given trough of the wave travels 50.0 cm in 15 seconds. What is the wavelength of the water wave? Produce all your workings. I got 50/30 = 1.67 vibrations
  82. Physical Science

    On a hot summer day (30 degrees Celcius), a pesky little mosquito produced its warning sound near your ear. The sound is produced by the beating of its wings at a rate of about 600 wing beats per second. What is the frequency in Hertz of the sound wave?
  83. Math

    Hello i am doing assignment in my math 20-2 class. The question is: data collected of cars passing on the road revealed that the average speed was 90 km/h with a standard deviation of 5 km/h and the data which is normally distributed a policeman is
  84. statiatics- central tendency

    The Frequency distribution of a histogram is the following scores: X F 1 1 2 1 3 2 4 1 1) what is the total area in the histogram? 2) what is half the area in the histogram? 3) Assume that the scores are measurements of a discrete variable. Find the
  85. math-please help

    Explain why the slope of a horizontal line is zero, and the slope of a vertical line is undefined. The slope is the tangent of the enclosed angle. Tan = vertical side divided by horizontal side. With a horizontal line, the verticle side is zero and
  86. math

    mr sato will give each pair of students 3 magnets. So far Mr sato has given 9 pairs of students their 3 magnets..How many more magnets does Mr Sato need so that each pair of students has exactly 3 magnets.There are 24 students in a science class.
  87. science URGENT!!

    what is the relationship does wave height have with frequency? What is the relationship does wave height have with amplitude?
  88. Physics

    A 17.0 kg monkey hangs from a cord suspended from the ceiling of an elevator. The cord can withstand a tension of 220N and breaks as the elevator accelerates. What was the elevator's minimum acceleration (magnintude and direction)? Please show me how to do
  89. 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?
  90. com170

    I would like to know if i am on the right track I am to write five sentence about the role of education in a successful financial planning.I am to highlight the verb and put the tense in parentheses. Here goes Education plays a major role in successful
  91. creative writing- please help

    Please help me- I signed up for a creative writing class thinking that I would do pretty well because I am not that bad of a writer but the questions that are asked are really hard to answer. The questions that were asked were like "how old is the color T"
  92. Physics

    Henrietta is going off to her physics class, jogging down the sidewalk at a speed of 2.05 m/s. Her husband Bruce suddenly realizes that she left in such a hurry that she forgot her lunch of bagels, so he runs to the window of their apartment, which is a
  93. math

    What is the way to find the answer to the problem....3x+1=10? My teacher told us in class but I just didn't understad it. The idea is to get the x all alone on one side. Subtract one from each side. Then, divide each side by three. 3x + 1 = 10 First
  94. English

    I urgently need you to check these sentences. Thank you. 1) We'll agree on which students to include in the project during our parent-teacher class committees, (which will be held) in November. 2)It’s no use trying to convince him. It's no good (I need
  95. math

    The sum of a number divided by 5 and 7 is 2. i need help writing this as an equation thank you
  96. Math

    What is the work for the problem 61,125 divided by125
  97. math

    how to work out the answer to 0.08 divided by 0.7, it dividing decimals
  98. math

    write an expression for the sum of a number and 8, divided by 6
  99. history

    what were the reasons our forefathers divided the government into three branches?
  100. pre cal

    Find f(x) and g(x) so that the function can be described as y = f(g(x)). y = eight divided by x squared + 2