1. emergency physics

    The 2nd harmonic of a string of length 40cm and linear mass density 1.11g.m has the same frequency as the 5th resonance mode of a closed pipe of length 1.4m. Find the tension in the string. use 340 for speed of sound
  2. physics

    A vertical spring stretches 13 cm when a 2.3 kg block is hung from its end. (a) Calculate the spring constant. This block is then displaced an additional 3.2 cm downward and released from rest. Find the (b) period, (c) frequency, (d) amplitude, and (e)
  3. Organic Chemistry lab

    So we did a preparation of t-pentyl Chloride experiment in class the other day using t-pentyl alcohol, HCL, Aqueous sodium Bicarbonate, and calcium chloride as the drying agent. Little confused on a few of these questions Why is calcium chloride used as
  4. computer class

    ok so my computer (windows) is acting weird, i used a software on it that i've never use before and now when i turn it on says "sorry for the inconvienence due to software or hard drive change your computer had done something to protect your files and
  5. Nsuk

    (1)calculate the heat energy datas temperatures 100degree celciuse and 4degree celciuse,mass 0.5kg take latent heat of vapourisation 2.02times10raised to the power of minus6.(2)calculate the specific latent heat of fusion mass of calorimeter 0.01kg and
  6. Social Studies/English

    Hi! I'm writing a research paper for my AP English class. My topic is abolishing the British Monarchy. I am trying to prove that the monarchy should be maintained. Does anyone know any good sources of information to help me or any ideas to help me prove my
  7. Chemistry

    I have two questions: 1. A sample of 10.7 g of CO reacts completely with O2 to form CO2. How many grams of CO2 will be formed? 2. Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide. The byproduct is water. 637.2 g of ammonia are reacted with
  8. AED 204

    Can anyone help me answer this question. I need it to be 200 to 300 words. Riley Behler, a third-grade teacher at the Martin Luther King Elementary School, has been asked to see the principal, Erin Wilkerson, after the students leave. Dr. Wilkerson
  9. AED 204

    Can anyone help me answer this question. I need it to be 200 to 300 words. Riley Behler, a third-grade teacher at the Martin Luther King Elementary School, has been asked to see the principal, Erin Wilkerson, after the students leave. Dr. Wilkerson
  10. Math

    In a class of 32 students study Spanish(S) and 20 of the students study French(F).Calculate the number of students who study Spanish(S) but not French(F).
  11. Statistics

    A class consists of 9 students with an average age of 40. When the Instructor arrives the average age of the students and the Instructor is 41. What is the age of the Instructor?
  12. math

    In a class, 3/4 of the pupils wore spectacles.1/3 of the pupils who did not wear spectacles were boys.What fraction of all the pupils were boys who did not wear spectacles?
  13. maths

    in a class 3/4 of the pupils wore spectacles 1/3 of the pupils who did not wear spectacles were boys what fraction of all the pupils were boys who did not wear spectacles
  14. MATH

    The following data represent the asking price of a simple random sample of homes for sale. Construct a 99% confidence interval with and without the outlier included. Comment on the effect the outlier has on the confidence interval. Here is the information:
  15. Statistics

    A random sample of 14 college female students revealed their average height was 66.1 inches. a) How many students should be in a samle if a 95% confidence interval is to have a margin of error of only plus/minus 1 inch? Is that the only information you
  16. English

    Correct the errors in these quotations. I Have this homework, I don't know if I'm in the right track... 1."This is the hardest class I've ever taken. It's also the most rewarding. The teacher sets the bar high and I think that forces us to learn more,"
  17. English

    For english class, I have to read a biography/autobiography of an author and then read two of the author's books that have been influenced by their real life. I chose F. Scott Fitzgerald as my author. I want to read The Great Gatsby as one of the books,
  18. math

    a building is 219 feet tall. for a class project, jim is to make a scale model of the building to place in the front hall display case. the display case is 28 inches tall. which scale will allow him to make the tallest model that will fit in the display
  19. statistics

    Last week Tom had exams in Math and in Spanish. He had a score of 45 on the Math exam and a score of 65 on the Spanish exam. For which class should Tom expect the better grade? a. Math b. Spanish c. The grades should be the same because the two exam scores
  20. math 3

    The following data represent the asking price of a simple random sample of homes for sale. Construct a 99% confidence interval with and without the outlier included. Comment on the effect the outlier has on the confidence interval. Here is the information:
  21. Math Stats

    The following data represent the asking price of a simple random sample of homes for sale. Construct a 99% confidence interval with and without the outlier included. Comment on the effect the outlier has on the confidence interval. Here is the information:
  22. maths

    If lemon is divided into four equal parts then find the total surface area of one part of lemon
  23. maths

    If sphere is divided in to four equal parts then find the total surface area of one part of sphere.
  24. Sin/Cos

    I'm having trouble with a concept. I don't understand how the answer was found. 1. Find three other angles, such that cos[beta] = cos [25]. Answers are -25, 335, -335. In my Calc class, the teacher showed it by using a circle, with an angle. Can anyone
  25. math

    If everyone had the same body proportions, your weight in pounds would vary directly with the cube of your height in feet. Assume the average height and weight of a female in your math class is 5'5" and 150 pounds. Use this information to write a variation
  26. statistics

    In the old days, we could buy 8 inch floppies for our computers on which to store our favorite programs and data. But, the manufacturing ability was not that good back then and 1% of these 8 inch floppies sold had a bad sector or two on them which made
  27. stats

    1. Conduct a hypothesis test for the following scenario. SHOW ALL YOUR WORK THE WAY WE DID IN CLASS! A coffee-dispensing machine is supposed to deliver 12 ounces of liquid into a large paper cup, but the costumer believes that the actual amount is less. As
  28. math

    The table shows the results of rolling a number cube labeled one through six 50 times. (table) number rolled: 1, 2, 3, 4, 5, 6 Frequency: 7, 9, 11, 6, 9, 8 What is the experimental probability of rolling 3? 0.11 0.22 0.30 0.27
  29. science

    A sound source of frequency 170Hz is placed near a wall. A man walking from the source towards the wall. Find that there is a periodic rise and fall of sound intensity?
  30. WAVE CALCULATION QUESTION URGENT!!!!!!!!

    Convert 8.6 x 10^13 Hz to nanometers. Assuming this is a light wave, Frequency*wavelength= speed oflight jiko like question jiko know all. ;.)
  31. physics

    How do I calculate String mass density from what I got frequency= 30.0Hz, segment length= 42.5cm , nodes=2, string length=83.5cm and tension=2.150kN?
  32. Control engineering

    Define compensation and why it is important, Justify? And design a basic control compensation using time and frequency domain. Lead compensation Lag compensation
  33. physics

    a 2m long string of mass 10g is clamped at boths ends.the tension in the string is 150N.the string is plucked so that it oscillate.what is the wavelength and frequency of the resulting wave it is produce a standing wave with two antinodes?
  34. physics

    a 2m long string of mass 10g is clamped at boths ends.the tension in the string is 150N.the string is plucked so that it oscillate.what is the wavelength and frequency of the resulting wave it is produce a standing wave with two antinodes?
  35. physics

    a 2m long string of mass 10g is clamped at boths ends.the tension in the string is 150N.the string is plucked so that it oscillate.what is the wavelength and frequency of the resulting wave it is produce a standing wave with two antinodes?
  36. physics

    A weight of 30.0 N is suspended from a spring that has a force constant of 180 N/m. The system is undamped and is subjected to a harmonic driving force of frequency 11.0 Hz, resulting in a forced-motion amplitude of 5.00 cm. Determine the maximum value of
  37. physics

    A weight of 50.0 N is suspended from a spring that has a force constant of 190 N/m. The system is undamped and is subjected to a harmonic driving force of frequency 10.0 Hz, resulting in a forced-motion amplitude of 4.00 cm. Determine the maximum value of
  38. physics

    A generator uses a coil that has 280 turns and a 0.45-T magnetic field. The frequency of this generator is 60.0 Hz, and its emf has an rms value of 120 V. Assuming that each turn of the coil is a square (an approximation), determine the length of the wire
  39. Physics

    The mass of a string is 6 grams, and it is stretched so that its tension is 150 N. A transverse wave travelling on this string has a frequency of 160 Hz and a wavelength of 0.40 m. What is the length of this string? (ii) A chain saw has a measured sound
  40. Trigonometry

    Hello all, In our math class, we are practicing the trigonometric identities (i.e., sin^2(x)+cos^2(x)=1 or cot(x)=cos(x)/sin(x). Now, we are working on proofs that two sides of an equation are equal (for example, sin(x)*csc(x)=1;
  41. chem lab

    hi im doing a post lab sheet for chem class. and im having a little trouble. i have: temperature 12.6 C -> 285.6 K Time 816 sec but im supposed to find 1/T(K) it looks like my classmate did this: 12.6 x 285.6 = 3598.56 however they gave me the response
  42. Chem

    A metal whose threshold frequency is 1.80×1015 s-1 emits an electron with a velocity of 7.24×105 m/s when radiation of 2.13×1015 s-1 strikes the metal.Use these data to calculate the mass of the electron.
  43. Physics

    Light of wavelength 550 nm in vacuum passes through a piece of crown glass of refractive index of 1.52. Find the velocity and frequency of light in crown glass.
  44. hardware

    What is the maximum frequency output for a square wave from the HP 33120A Waveform Generator? I found the HP 33120A Waveform Generator on the Agilent website but I'm not sure how to figure out the problem.
  45. scince

    A loboratory uses an ultrasonic-scanner to trance tumar in tissue. The operting frequency of the 6 scanner is 4.2*10 hz.calculate the wavelength of sound in the tissue if the speed of the sound is 1700 m/s.
  46. Physics

    A space station is shaped like a ring and rotates to simulate gravity. If the radius of the space station is 140 m, at what frequency must it rotate so that it simulates Earth's gravity?
  47. English

    I need help on my grammar and figuring out a way to write these answers more better. Shakespeare in Love 1) What are the main themes of the film? The filmmaker’s message is not clear until we see what happens to the protagonist. The Main themes of the
  48. Statistics

    A social psychologist asked 15 college students how many times they "fell in love" before they were 11 years old. The numbers of times were as follows: 2,0,6,0,3,1,0,4,9,0,5,6,1,0,2 make (a) a frequency table and (b) a histogram. Then describe the general
  49. Physics

    Hi! I am going to apply for a medical study admission test and where just wondering if you guys could help me to come up with the formula for solving this problem. I am not looking for a answer, just the mathematical formula to solve theese kind of
  50. object oriented programming

    Let’s consider there will be 5 delicious food available at your new restaurant which will open by the end of 2016. To make the cashier's job easier, build a C++ console application to automate the process of billing on a daily basis. Specifically,
  51. English

    Identifying antecedents 10a. The antecedent in the following sentence is students: Students in online classes have to be organized to keep up with their assignments. 10b. The antecedent in the following sentence is class: Students in online classes have to
  52. problem solving

    kirk grew a crystal in science class. On monday it was 13/16 inch tall. it had grown 1/4 inch bet friday and monday. It had grown 1/2 inch between Tues and Fri. How tall was Kirk'a crystal on Tues?
  53. 4th grade math

    Can you check please. 1. Melvin had 20 children in his kindergarten class. Two-fifths of the children had brown eyes. Onefourth of the children had blue eyes. The rest had hazel eyes. How many children had hazel eyes? 20(2/5) = 8 brown 20(1/4) = 5 blue
  54. math

    Bridget surveyed some students at her school about their favorite classes. Of the students surveyed, 3 said Spanish was their favorite class, while 9 of the students had other favorite classes. If Bridget surveys 8 more students, how many of them should
  55. college physics

    An oscillator consists of a block attached to a spring (k = 299 N/m). At some time t, the position (measured from the system's equilibrium location), velocity, and acceleration of the block are x = 0.0817 m, v = -16.9 m/s, and a = -108 m/s2. Calculate (a)
  56. Geography

    Compare and contrast the societies, governments, and economies of both North and South Korea. This is what I got: Since 1945, the Korean Peninsula has been divided into two countries: North and South Korea. North Korea, which is also known as The
  57. math

    A school has 6th, 7th and 8th period Social Studies classes. One student from each class will be chosen to represent the school in an essay contest. The 6th period finalists are Mike, Sara, Luis and Ed. The 7th period finalists are Ben, Eric, and Sandy.
  58. cobet, maths

    there are 50 pupils in a class. 43 of them like mathematics, 38 like english and 33 like both mathematics and english. How many pupils like both mathematics and english??
  59. math

    1. Carlos works 8.25 h and receives $102.30 pay. What will he receive at the same rate if he works if he works 14 h?$173.60? 2. divide -15/-3=5? 3.Name the property of addition that is illustrated. (3 +6)+ 9 = 3+ (6 +9)ASSOCIATED PROPERTY? 4.Find the
  60. HELP! PHYSICS LABS!!

    CAN someone please help me...I am so confused and I have little time left to do my assingment, please! I am freaking out! Please help me!! Can someone please explain why when the centripetal force increases, so does the radius, and why when Centripetal
  61. physics

    An R-C circuit is driven by an alternating voltage of amplitude 110 and frequency . Define to be the amplitude of the voltage across the capacitor. The resistance of the resistor is 1000 , and the capacitance of the capacitor is 1.00 . I need help on what
  62. Physics

    The 2nd harmonic of a string of length 60cm and linear mass density 1.7g/m has the same frequency as the 5th possible harmonic of a closed pipe of length 1.2m. Find the tension in the string.
  63. Chemistry

    An electron initially in the n = 2 energy level in a hydrogen atom absorbs a photon of light with a frequency of 6.167 x 1014 s-1. Calculate the new energy level the electron will occupy. I am not sure how to being.
  64. Physics

    A stationary whistle emits a sound of 188 Hz. If passengers in a car hear the whistle with a frequency of 198 Hz, how fast was the car moving? Use 340 m/s for the sound velocity
  65. Physics

    A PVC pipe that is one meter long is struck and the speed of sound is 345 m/s. What is the fundamental frequency (n=1) of the pipe when: a. The pipe is open at both ends? b. The pipe is closed at one end, open at the other?
  66. Physics

    An observer is located directly between two speakers, located 20m apart. The speakers are in phase with each other, and both are emitting a sound with a frequency of 60Hz. How far away from the centre should the observer move to get the first destructive
  67. physics

    consider an inductive circuit suppose we want the current amplitude in a radio receiver to be 250*10^-6 A when the voltage amplitude is 3.6V at a frequency of 1.6MHz. what inductance reactance is needed?what inductance is needed?
  68. Physics

    A 30 hz sound is annoying or dissonant to the ear. If one clarinet plays a sound at a frequency of 360 Hz, at what frequencies (more than one) might another clarinet simultaneously play so that dissonant 30 Hz beats are created? Explain.
  69. Physics

    When four people with a combined mass of 320 kg sit down in a car, they find that the car drops 0.80 cm lower on its springs. Then they get out of the car and bounce it up and down. What is the frequency of the car's vibration if its mass (when it is
  70. physics

    Two strings are adjusted to vibrate at exactly 224 Hz. Then the tension in one string is increased slightly. Afterward, three beats per second are heard when the strings vibrate at the same time. What is the new frequency of the string that was tightened?
  71. chemistry

    Your 1.1 cubic foot GE microwave oven generates 1100 watts of microwaves at a frequency of 2.45 GHz. a. What is the wavelength of the microwave radiation being emitted? b. How many photons per second of microwaves are being emitted?
  72. Physics

    A PVC pipe that is one meter long is struck and the speed of sound is 345 m/s. What is the fundamental frequency (n=1) of the pipe when: a.The pipe is open at both ends? b.The pipe is closed at one end, open at the other?
  73. physics

    It takes a time t=.025s in order for an oscillator to complete one cycle. What is the angular frequency of the oscillator? so i got phase= omega t + phase zero so i got 8Pi/4=.025omega omega=251.33 Is this right?
  74. physics

    It takes a time t=.025s in order for an oscillator to complete one cycle. What is the angular frequency of the oscillator? so i got phase= omega t + phase zero so i got 8Pi/4=.025omega omega=251.33 Is this right?
  75. physics

    The figure below represents a periodic wave. Each increment on the equilibrium line is 760 cm. What is the wavelength for this wave (in m)?If the wave in the figure above has a frequency of 60 Hz, what is the wave's speed?
  76. chemistry

    Excited lithium atoms emit radiation at 670.8nm. a. calculate the frequency of this radiation. b. calculate the energy (in eV) of this radiation. c. What color is this radiation?
  77. Chemistry

    A radio station's channel, such as 100.7 FM or 92.3 FM, is actually its frequency in megahertz (MHz), where 1 MHz=10^6 Hz . Calculate the broadcast wavelength of the radio station 107.1 FM.
  78. Genetics (plz check answer)

    Question: Calculate the frequency of the AA, Aa, and aa genotypes after one generation if the initial population consists of 0.2 AA, 0.6 Aa, and 0.2 aa. What I have done is: P = (0.2)+(0.5)(0.6)= 0.50 q = 1-p = 1 - 0.50 = 0.50 Can someone check my answer
  79. Physics

    A 1m long string having mass of 4 gm is stretched by a force of 78.4N. calculate the frequency of the fundamental mode of vibration and the mass by which the string was stretched at its one end.
  80. physics

    Sound waves in iron have a speed of about 5100 m/s. If the waves have a frequency of 400 Hz, what is their wave length? I am thinking it is 12.75 v/f 5100/400 is 12.75 m Is this correct. Thank you
  81. physics

    Green light has a wavelength of 4.96 10-7 m and travels through the air at a speed of 3.00 108 m/s. Calculate the period of green light waves with this wavelength. s What is the frequency? Hz
  82. bio (plz check answer)

    Question: Calculate the frequency of the AA, Aa, and aa genotypes after one generation if the initial population consists of 0.2 AA, 0.6 Aa, and 0.2 aa. What I have done is: P = (0.2)+(0.5)(0.6)= 0.50 q = 1-p = 1 - 0.50 = 0.50 Can someone check my answer
  83. chemistry

    Excited lithium atoms emit radiation at 670.8nm. a. calculate the frequency of this radiation. b. calculate the energy (in eV) of this radiation. c. What color is this radiation?
  84. physics

    Green light has a wavelength of 4.96 10-7 m and travels through the air at a speed of 3.00 108 m/s. Calculate the period of green light waves with this wavelength. s What is the frequency? Hz
  85. working with data

    josephs final averages in science class are shown in the table below. homework % toward final grade-20% average-93 quizzes % toward final grade-20% average-92 tests % toward final grade-40% average-85 final exam % toward final grade-20% average-? what is
  86. English

    1. If I had studied hard, I could have gotten a higher score. 2. If I had studied hard, I could have gotten a better result. 3. If I had studied hard, I could have gotten a good/better grade. 4. If I had studied hard, I could not have gotten a lower score.
  87. Organic Chemistry

    So we did a preparation of t-pentyl Chloride experiment in class the other day using t-pentyl alcohol, HCL, Aqueous sodium Bicarbonate, and calcium chloride as the drying agent. Little confused on a few of these questions Aqueous sodium bicarbonate was
  88. culture

    Elizabeth Fernea is a Euro-American, (upper) middle class woman accompanying her anthropologist husband to a very foreign setting in the mid-1950s. What have you learned so far about some of the differences between the ways people live in Iraq and the way
  89. math

    The Ministry of Finance published the FY2009 Tax Reform ( Main Points) on December 19, 2008. Included in the Reform is the introduction of a 2- year measure allowing immediate depreciation for investment in energy- saving facilities and appliances. If this
  90. Psychology/Statistics

    I have a quick question for you all. I have done a repeated measures ANOVA for hypothetical data in my Stats class. There were 5 subjects.. all subjects rated their mood on a cloudy day, then they all rated their mood on a sunny day. In sum.. they all
  91. math

    The Ministry of Finance published the FY2009 Tax Reform ( Main Points) on December 19, 2008. Included in the Reform is the introduction of a 2- year measure allowing immediate depreciation for investment in energy- saving facilities and appliances. If this
  92. Business

    Isabella is hoping to get an A on her college Algebra course. With just the finaL exam left to take, she currently has an average of 85 on her quizzes and average of 92 on her exercises. The quizzes count for 40%, exercises count for 30% of the class
  93. Research Writing

    I have to pick a topic and list argument and counter-argument for a research paper (com 220 class). I would like to write about the death penalty, I just need help chosing a pro and con to write about. I believe I need more detail than just saying my topic
  94. Statisics

    4. The purpose of the investigation was to examine the effects of the Tweed edgewise technique on mandibular growth and rotation. It employed 36 Class II Tweed edgewise patients, all of whom had 4 bicuspids extracted during the course of treatment.
  95. psychology

    Nisa has grown up in a small village in the foothills. There was no electricity and water had to be hand pumped. They seldom saw people from the "outside." When she entered school the bus had to pick her up at 6:30 am in order for her to arrive at school
  96. psychology

    Nisa has grown up in a small village in the foothills. There was no electricity and water had to be hand pumped. They seldom saw people from the "outside." When she entered school the bus had to pick her up at 6:30 am in order for her to arrive at school
  97. Psychology Please Help!!

    Nisa has grown up in a small village in the foothills. There was no electricity and water had to be hand pumped. They seldom saw people from the "outside." When she entered school the bus had to pick her up at 6:30 a.m. in order for her to arrive at school
  98. Env Science

    Using the 4 principles of sustainability Reliance on Solar Energy, Nutrient recycling, Biodiversity, and Population control. How would you classigy the following? Recycling soda cans :Using a rake instead of a leaf blower :Choosing to have no more than one
  99. French

    I need to fill out this paragraph with what my class calls "des petits mots" but I'm so confused! Could someone help me? "Les forêts __1__ nous avons le __2__ besoin __3__ trouvent en Amazonie. Cette vallée est un domaine naturel qu'il faut préserver
  100. algebra

    Simplify. Do not use negative exponents in the answer. 12x-2y4 -3xy-7 There should be a line between like a fraction but it did not copy or paste. This is the answer I got 12 x^-2 y^4 = 12y^4/x^2 -3xy^-7 = -3x/y^7 it was wrong. 12x^-2y^4 / -3xy^-7 = 12/-3