Popular questions and responses by Confused
  1. 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

    asked on January 24, 2013
  2. college physics

    a tennis ball is thrown straight up with an initial velocity of 22.5 m/s. it is caught at the same distance above the ground. a). how long does it take to reach its maximum height? b). how high does the ball rise? c). at what speed does it hit the ground?

    asked on April 2, 2013
  3. Physics

    When the pendulum bob reaches the mean position, the net force acting on it is zero. Why then does it swing past the mean position?

    asked on October 31, 2012
  4. physics

    1)A toy train is initially at rest on a track fastened to a bicycle wheel, which is free to rotate. How does the wheel respond when the train moves clockwise? When the train backs up? Does the angular momentum of the wheel-train system change during these

    asked on July 9, 2010
  5. English

    in which sentence is the underlined word the simple predicate? A. According to legend, THERE is buried treasure nearby. B. People with metal detectors SEARCH for it every weekend. C. So far, no treasure has BEEN found. D. Most treasure seekers leave here

    asked on September 17, 2018
  6. Physics

    What is the angle of refraction of a light ray that enters the surface of a calm lake from air at an angle of 45o to the normal? The refractive index of water is 1.333. I don't even know how to start this or what the formula is. Thanks for your help in

    asked on January 24, 2013
  7. math

    The 2 pulleys in the figure have radii of 15 cm and 8 cm, respectively. The larger pulley rotates 25 times in 36 seconds find the angular velocity of each pulley in radians per second. Find angular velocity of each pulley in radians per second.

    asked on December 2, 2010
  8. Chemistry

    The aquation of tris(1, 10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)3^2+ + 3H3O + 3H2O==> (Fe(H2O)6^2+ + 3 phenH^+ If the activation energy is 126 kJ/mol and frequency factor is 8.62 x 1017 s-1, at what

    asked on March 2, 2010
  9. Physics

    In the figure a uniform, upward electric field of magnitude 1.90 × 103 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 19.0 cm and separation d = 1.60 cm.

    asked on September 16, 2016
  10. Physics

    * At an accident scene on a level road, investigators measure a car's skid mark to be 58 m long. It was a rainy day and the coefficient of friction was estimated to be 0.38. Use these data to determine the speed of the car when the driver slammed on (and

    asked on November 1, 2015
  11. Physics

    Which of the following equations describes the condition for observing the fourth bright fringe in Young's double-slit interference pattern? Assume n = 0 for the central bright fringe. Which of the following equations describe the condition for observing

    asked on January 24, 2013
  12. Math

    Is the product of 4/7 and radical 16 a rational or irrational number? Explain.

    asked on June 13, 2018
  13. physics

    A crate rests on a flatbed truck which is initially traveling at 17.8 m/s on a level road. The driver applies the brakes and the truck is brought to a halt in a distance of 33.1 m. If the deceleration of the truck is constant, what is the minimum

    asked on October 2, 2014
  14. Chemistry

    HOBr (aq) H+ (aq) + OBr- (aq), Ka = 2.3 x 10^-9 Hypobromous acid, HOBr, is a weak acid that dissociates in water, as represented by the equation. (a) Calculate the value of [H+] in a solution of HOBr that has a pH of 4.95. Ans: 1.1 * 10^-5 M (b) Write the

    asked on April 10, 2012
  15. Spanish

    Add a prepositional phrase to clarify either to whom an item(s) belongs. Cual es su problemas? (ella) Thank you for using the Jiskha Homework Help Forum. Don't be confused! A prepositional phrase is often used to clarify "su" because it could mean "hers,

    asked on June 24, 2007
  16. Math

    A car traveled 36 miles in 45 minutes, the car traveled at a constant speed. If the the car continues to travel at this rate, which equation can be used to determine y, the total number of miles the car will travels in x hours?

    asked on March 30, 2018
  17. Geometry

    For an ellipse, one focus is (0,0), one vertex is (2,0), and the eccentricity is 0.4. How do I find the equation for the ellipse? It seems like I have so little information!

    asked on May 28, 2012
  18. Math

    The world record for cycling a stretch of 20 kilometers is 26 minutes. This corresponds to an average speed of, approximately, (A) 29 mph (B) 46 mph (C) 32 mph (D) None of these

    asked on August 9, 2017
  19. Science

    Which of the following is a problem with using solar power as a main source of energy? A. People do not yet have the technology to use solar power*** B. The sun is not close enough to provide solar energy C. Power from solar energy contains a large amount

    asked on April 13, 2017
  20. Science

    On page 111 of your reading material there is a problem that requires you to calculate the average speed for a daylong bus trip. The rest stops the driver made are included in the calculations because that is how the problem is defined. However, suppose

    asked on December 7, 2015
  21. Chemistry

    A direct-current power supply of low voltage (less than 10 volts) has lost the markings that indicate which output terminal is positive and which is negative. A chemist suggests that the power supply terminals be connected to a pair of platinum electrodes

    asked on May 1, 2012
  22. chemistry

    a 10.0mL vinegar sample was completely neutralized by 22.5mL 0.2M NaOH solution. calculate molarity and % of acetic acid in vinegar. please help

    asked on April 26, 2010
  23. physics

    A car on the highway travels at 90 km/hr. Express this speed in m/s. can yall show me how to convert this

    asked on July 31, 2018
  24. physics

    A bow with a spring constant of 398 N/m has an arrow placed in it and pulled back a distance of 0.6 m. If the arrow is shot straight up in the air how high will it go? Assume the mass of the arrow is 0.16 Kg.

    asked on October 16, 2014
  25. Physics

    A person's body is producing energy internally due to metabolic processes. If the body loses more energy than metabolic processes are generating, its temperature will drop. If the drop is severe, it can be life-threatening. Suppose a person is unclothed

    asked on December 7, 2012
  26. college algebra

    find functions f anf g so that fog equals H H(x)=ãx^2+17 please show work

    asked on November 30, 2012
  27. college algebra

    solve the following exponential equation. 7^x=8 a. x= Write in exact solution b. then with that answer move the decimal 3 points over

    asked on November 27, 2012
  28. Physics

    Which of the following is an example of diffuse reflection? light reflected from the surface of a dry asphalt roadway light reflected from the surface of a calm lake light reflected from the surface of glossy paper light reflected from the surface of a

    asked on October 29, 2012
  29. Physics

    When the pendulum bob reaches the mean position, the net force acting on it is zero. Why then does it swing past the mean position?

    asked on October 23, 2012
  30. Advanced physical science

    An astronaut drops a golf ball to the surface of the moon from a height of 1.5m. The golf ball has a velocity of 2.24 m/s right before it lands on the moon (assume this height to be zero). What is acceleration due to gravity on the moon?

    asked on October 4, 2012
  31. Chemistry

    What alkane effuses at 1/5 the rate of He

    asked on June 18, 2012
  32. physics

    A spherical conductor has a radius of 14.0 cm and charge of 26.0 µC. Calculate the electric field and the electric potential (a) r = 10.0 cm, (b) r = 20.0 cm, and (c) r = 14.0 cm from the center. how do i calculate k?

    asked on February 7, 2012

    A spherical conductor has a radius of 14.0 cm and charge of 26.0 µC. Calculate the electric field and the electric potential (a) r = 10.0 cm, (b) r = 20.0 cm, and (c) r = 14.0 cm from the center.

    asked on February 7, 2012
  34. statistics

    you draw two cards from a standard deck of 52 cards, but before you draw the second card, you put the first one back and reshuffle the deck.

    asked on April 15, 2011
  35. math

    find v for the following question.. the tip of the airplane propeller 3m long, rotating 500 times per minute (hint r=1.5m)

    asked on December 2, 2010
  36. Reaction rates

    The reaction, C2H5Br --> C2H4 + HBr, has a rate constant k = 0.0000100 s-1 at 363 °C and k = 0.000479 s-1 at 427 °C. What is the rate constant for the reaction at 725 K? Round your answer to 3 significant figures.

    asked on November 20, 2010
  37. Concentration and Reaction

    The rate of the following reaction: Radioactive decay of 90Sr, is characterized by the rate constant k = 0.024 year-1. What is the half-life (in years) for this reaction at the same conditions when the initial concentrations are 0.0356 M? (Round your

    asked on November 20, 2010
  38. physics

    1. If our sun shrank in size to become a black hole, using the gravitational force equation, explain why the Earth's orbit would not be affected. 2. Strictly speaking, you weigh a tiny bit less when you are in the lobby of a massive skyscraper than you do

    asked on July 13, 2010
  39. please help me paraphrase

    I am going to have questions to answer on this passage, and it's very difficult to understand so if anyone could please help me paraphrase or give me a summary, it would help a lot. Thanks. Genius or originality is, for the most part, some strong quality

    asked on October 25, 2006
  40. math

    To use a certain cash machine, you ned a persona identification code. If each code consists of two letters followed by one of the digits from 1-9(such as AQ7 or BB3) or one letter followed by two difits (such as Q3 or J88), how many different codes can be

    asked on June 19, 2020
  41. math

    Kelly enlarged the area of a photograph to 250% of its original size. The original dimensions of the photograph were 5 inches by 7 inches. What is the area of the enlarged photograph, in square inches? I know the solution is 5(2.5) times 7(2.5) but it says

    asked on June 12, 2020
  42. math

    A marksman's chance of hitting a target with each of his shots is 60%. (Assume that the shots are independent of each other.) If he fires 30 shots, what is the probability of his hitting the target at least 20 time? First, I found the mean by multiplying

    asked on December 4, 2019
  43. Biology

    which of the following list structures from smallest to largest? A. chromosome, supercoil, coil, nucleosome, double helix B. chromosome, coil, double helix, nucleosome, super coil C. double helix, nucleosome, coil, super coil, chromosome D. nucleosome,

    asked on September 13, 2018
  44. Math

    Is x^2 + y^2= 6 An equation for a circle??

    asked on April 2, 2018
  45. physics

    What would it mean if mu is greater than one?

    asked on October 17, 2014
  46. advance math

    an aquarium is in the shape of a right rectangular prism. each side of the aquarium is a rectangle that is 10 in wide and 8 in high. when the aquarium is tilted, the water in it just cover an 8 in by 10 in end, but only three-fourths of the rectangular

    asked on October 3, 2013
  47. Calculus

    The region between the graphs of x=y^(2)and x=2y is rotated around the line y=2. The volume of the resulting solid is... I've tried this five times and no luck. Please help. I think my a=o and b=2. I would appreciate the help.

    asked on February 9, 2013
  48. college algebra

    use the properties of logarithms to find the exact value of the expression loglower 3^18 - log lower3^6 **how do I make the three lower in the log equation?

    asked on November 27, 2012
  49. Advanced physical science

    At the top of the Washington monument, a bird drops an acorn into the reflecting pool 169m below. If the acorn has a massof 1.0 kg, with what velocity would it hit the water?

    asked on October 4, 2012
  50. Advanced physical science

    A fiery ball of wood is loaded into a medieval catapult to be thrown into a castle. Unfortunately, the attacking heathens are not very smart and since geometry and physics were not studied in their time, they launched the ball straight up into the air. The

    asked on October 4, 2012
  51. APS

    The Marshmellow man tromps along the streets of New York City with his blue sailor hat on. He tries to climb up a building to reach Ghostbusters and a gargoyle statue falls 326m to the street below. What height is the gargoyle when it reaches a velocity of

    asked on October 4, 2012
  52. APS

    Ben eats a bowl of rice as he walks across the San Francisco Bridge. When he is finished, he drops his empty bowl 67m down to the bay water. What speed does it hit the water with?

    asked on October 4, 2012
  53. economics

    In the following examples, state how you would use the principle of marginal analysis to make a decision. a. Deciding how many days to wait before doing your laundry b. deciding how much library research to do before writing your term paper c. Deciding how

    asked on June 1, 2012
  54. Chemistry

    A 0.5224g sample of an unknown monoprotic acid was titrated with 0.0998M of NaOH. The equivalence point of the titration occurs at 23.82 mL. Determine the molar mass of the unknown acid.

    asked on April 29, 2012
  55. chemistry

    If you filled three balloons with eaqual volumes of hydrogen, argon, and carbon dioxide gas all at the same temperature and pressure, which ballon would weigh the most? The least?

    asked on December 13, 2011
  56. 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

    asked on December 8, 2011
  57. calculus

    The function f is twice differentiable, and the graph of f has no points of inflection. If f(6)+3, f'(6)=-1/2, and f"(6)=-2, which of th following could be the value of f(7). A.)2 B.)2.5 C.)2.9 D.)3 E.)4 the answer is A. but what are the steps to reach

    asked on April 26, 2011
  58. chemistry

    What is the rate of the following reaction (M/s) if the rate constant for the reaction is 0.500 L•mol-1•s-1 and the concentration of each reactant is 0.0628 M. (The units for the rate constant depend upon the rate law). CO + NO2 --> CO2 + NO

    asked on November 20, 2010
  59. physics

    If there were no air drag, how fast would drops fall from a cloud 2.4 kilometer above the Earth's surface? answer in m/s.

    asked on October 6, 2010
  60. physics

    If there were no air drag, how fast would drops fall from a cloud 2.4 kilometer above the Earth's surface? Answer in m/s.

    asked on October 5, 2010
  61. physics

    1. (a) How far below an initial straight-line path will a projectile fall in eight seconds? (b) Does your answer depend on the angle of launch or on the initial speed of the projectile? the answer is no. but defend it. 2. Why is it important that a

    asked on July 13, 2010
  62. math

    In Quadratics Grade Ten:How do you find the coordinates of the vertex? What is the Optimum value mean? What are the zeros of the relation? How do you know if the parbola is Maximum or Minimum?

    asked on March 26, 2010
  63. math

    A Ferris wheel 28.0m in diameter rotates once every 21.0s. What is the ratio of a person's apparent weight to her real weight at the top? What is the ratio of a person's apparent weight to her real weight at the bottom?

    asked on October 2, 2009
  64. chemistry

    Benzene has a heat of vaporization of 30.72kj/mol and a normal boiling point of 80.1 C . At what temperature does benzene boil when the external pressure is 445 ? This is how I am solving this problem, but when I enter the answer it says im wrong. Can

    asked on January 24, 2009

    COS[ARCSIN (SIN 3PI/4)] =COS[ARCSIN (SQRT2/2)] =COS [PI/4] = SQRT2/2

    asked on December 11, 2008
  66. Chem

    Ascorbic acid, H2C6H6O6, is a diprotic acide with a K1= 7.9 E-5 and a K2=1.6E-12. In a .005 M aq solution of ascorbic acid which of the following species is present in the lowest concentration. 1. H2O 2. H3O 3. H2C6H6O6 4. HC6H6O6 5. C6H6O6

    asked on April 22, 2008
  67. accounting/finance

    What does a constant debt-equity ratio mean?

    asked on February 4, 2008
  68. English II

    I need to determine a rule as to why the answer is C. A.) Jumping off of a balance beam is different from jumping off a trampoline; each jump requires a unique skill. B.) Jumping off a balance beam is different from jumping off a trampoline; each jump

    asked on October 16, 2007
  69. psychology

    The major perspective in psychology that views behavior as guided by one's self image and by needs of personal growth is the a. cognitive view b. humanistic view c. psycholdynamic view d. biopsychological view I had already guessed c and that was wrong,

    asked on March 4, 2007
  70. chemistry

    In a titration, 21.5 mL of 0.00369 M Ba(OH)2 neutralized 12.1 mL of HCl solution. What is the molarity of the HCL solution? ( I used the titration formula and plugged in the given values. But it's wrong. I know we don't have to divide by any number to the

    asked on April 20, 2020
  71. trigonometry

    Points on the terminal sides of angles play an important part in the design of arms for robots. Suppose a robot has a straight arm 10 inches long that can rotate about the origin in a coordinate plane. If the robot's hand is located at (10, 0) and then

    asked on November 12, 2019
  72. chemistry

    In distillation components of a mixture are separated into groups of molecules with simi- lar 1. densities. 2. melting points. 3. None of these 4. bond energies. 5. boiling points. Filtration is which method of separation? 1. physical 2. chemical

    asked on September 19, 2019
  73. Texas History

    What troubled Manuel de Mier y Teran when he visited Texas, which he reported to the Mexican government? I picked "A. the amount of slavery in the state" because he was angry that Americans who arrived didn't respect the rule of "no slavery". Then I'm

    asked on October 26, 2018
  74. American government

    In both the house and senate, a bill introduced by a member is next a. Given a number b. Scheduled for floor debate c. Sent to a standing committee d. Sent to the president I read the text and I think the answer is D, am I wrong?

    asked on September 21, 2018
  75. American government

    If a majority of committee members support a bill, what is likely to happen to it? A. The committee will pigeonhole the bill B. the committee will report the bill favourably to the floor C. The committee will rewrite the bill D. The committee will report

    asked on September 20, 2018
  76. Human Resources

    You have just been hired as a human resource specialist and will be responsible for conducting background investigations. Which of the following is safest to assume? A. You will be posting background check results. B. You will be supervising new hires. C.

    asked on September 12, 2018
  77. Math

    1) Carlos and Nathan ate lunch together in a park bench. At 1:00p.m., they left the bench and walked in different directions. By 1:05p.m., Carlos and Nathan were 60 meters apart. If they each continued walking in a straight line at the same speed as

    asked on June 11, 2018
  78. Applied Math

    6 divided by 26 yd. 2 ft. 6 in. Please explain how you get this your answer if possible. Thank you in advance.

    asked on February 4, 2018
  79. Math help please!

    y + 1.2y + 1.2z Someone told me that the answer was 2.2y + 1.2z 1. Is that true? 2. How did the 1.2y turn into 2.2y?

    asked on December 14, 2017
  80. Math

    I have researched what a local extrema is and every definition is weird or worded to where i do not understand it. Can anyone explain what local extrema is.

    asked on December 11, 2017
  81. Finance

    Bell Mountain Vineyards is considering updating its current manual accounting system with a high-end electronic system. While the new accounting system would save the company money, the cost of the system continues to decline. The Bell Mountain’s

    asked on March 19, 2016
  82. physics

    Henry hits a hockey puck in the positive x-direction at time, t ≈ t0. The puck is then stopped by a net starting at time, t ≈ t1. Which of the following curves could describe the acceleration of the hockey puck if we ignore any effects of friction? 1.

    asked on September 23, 2015
  83. math

    1.A square has side lengths of 3 units. One of its vertices is at (5, -2). Which of the following are possible coordinates of another vertex? a)(9,-2) b)(8,-2) c)(5,5) d)(5,-1) idk can someone help i am confused

    asked on April 1, 2015
  84. math help needed bad

    I'm really confused on how to answer this question. Can someone help me to figure this out? Thank you A survey about the student government program at a school finds that of 245 students: -218 like the program -27 students think this program is

    asked on April 1, 2015
  85. math help needed bad

    how do I make a box and whisker plot with the numbers 13,13,20,21,21,22,24,27? I put them all in order but since there is only 8 numbers i do not know how to find the median,the lower quartile,upper quartile the lowest value and the highest value. Please

    asked on March 9, 2015
  86. physics

    A projectile is fired at 33.1° above the horizontal. Any effects due to air resistance are negligible. At the highest point in its trajectory, its speed is 15.5 m/s. Calculate the horizontal component of the initial velocity.

    asked on January 28, 2015
  87. physics

    A hockey puck slides with an initial speed of 40.7 m/s on a large frozen lake. If the coefficient of kinetic friction between the puck and the ice is 0.038, what is the speed of the puck after 11.9 s?

    asked on January 23, 2015
  88. physics

    A 2.3 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 111 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. See below. What is its potential energy

    asked on October 16, 2014
  89. physics

    Determine whether each statement below is true or false. The force necessary to lift an object is its mass times g. Kinetic energy is the energy of motion. Stopping distance is doubled, if speed is doubled. Work is the product of force and time. A joule is

    asked on October 16, 2014
  90. physics

    A 63.8 kg woman lifts herself 36.6 cm each time she does a chin-up. What force does she exert in lifting herself to the chin position? And, how much positive work does she do in pulling herself up once?

    asked on October 16, 2014
  91. physics

    A hockey puck slides with an initial speed of 52.3 m/s on a large frozen lake. If the coefficient of kinetic friction between the puck and the ice is 0.02, what is the speed of the puck after 11.8 s?

    asked on September 26, 2014
  92. statistics

    A politician claims that she will receive 65% of the vote in an upcoming election. The results of a properly designed random sample of 100 voters showed that 49 of those sampled will vote for her. Is it likely that her assertion is correct at the 0.05

    asked on June 11, 2014
  93. math

    c=2πr c= 7.12 pi= 3.14 find value of r -rounded to 2 decimal points

    asked on May 21, 2014
  94. Physics

    I've been working on this problem for close to an hour now and keep getting very wrong numbers... The two objects with different mass (m1 = 5.0 kg and m2 = 3.0 kg) in the Atwood's machine shown in the figure are released from rest, with one object at a

    asked on April 20, 2014
  95. Elementary Statistics

    There are 100 questions from an SAT test, and they are all multiple choice with possible answers of a,b,c,d,e. For each question, only one answer is correct, find the standard deviation for the numbers of correct answers for those who make random guesses

    asked on April 11, 2014
  96. problem solving - math

    the men are camping 45 miles due west and then go 60 miles directly north. if they can cover 18 miles a day how long will it take them to reach the railroad?

    asked on October 3, 2013
  97. problem solving - math

    timothy owns 13 chains, each chain having 3 links. timothy wants to use all the small chains to make one circular chain of 39 links. he needs 4 minutes to cut open a link and 10 minutes to close it by smoldering. timothy makes the big chain in 140 minutes.

    asked on October 3, 2013
  98. problem solving - math

    3 persons are to divide among themselves 21 equal cask, of which 7 are full, 7 are half full, and 7 are empty. how can an equitable division be made, without pouring the wine from any cask into any other, in such a way that each person receives the same

    asked on October 3, 2013
  99. discrete mathematics

    how many baseball games of single elimination must be played by 421 teams in a tournament before a winner is determined

    asked on October 3, 2013
  100. algebra

    a teacher reported 1/5 made A's, 1/4 made B, 1/3 made C's, 1/6 made D's, and 12 made F's How many are in the class Let X = the number of students 57/60 + 12 -------

    asked on September 22, 2013


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