Most popular questions and responses by Tommy
  1. Physics

    In a 5.00km race, one runner runs at a steady 11.6km/h and another runs at 15.0km/h. How long does the faster runner have to wait at the finish line to see the slower runner cross?

    asked on June 12, 2015
  2. Physics

    Hi, can anybody provide some hints in how to approach these questions? I've been stuck on it for days!!! Thank you in advance!! Nodes of a Standing Wave: Consider a standing wave, where y represents the transverse displacement of a string that extends

    asked on March 14, 2015
  3. English

    Combined the sentences by changing the italicized word group to an infinitvie or infinitive phrase (italicized word group) 1. The journalist took a job in the hotel. (This way he would get facts for an article. ) 2. Bob used raspberry flavor in the cod

    asked on April 8, 2011
  4. algebra1

    Help me please!!!! Solve. (–18x3 + 17x + 6) ÷ (3x + 2) (1point) –6x^2 + 4x + 3 6x^2 + 4x – 3 –6x^2 + 4x – 3 6x^2 – 4x + 3 The width, w, of a rectangular garden is x – 2. The area of the garden is x^3 — 2x – 4. What is an expression for

    asked on May 19, 2014
  5. Physics

    A sprinkler mounted on the ground sends out a jet of water at a 35∘ angle to the horizontal. The water leaves the nozzle at a speed of 15m/s . How far does the water travel before it hits the ground?

    asked on June 17, 2015
  6. physics

    A car moves with constant velocity along a straight road. Its position is x1 = 0 m at t1 = 0 s and is x2 = 48m at t2 = 5.0s . Answer the following by considering ratios, without computing the car's velocity. What is the car's position at t = 2.5s ? What

    asked on June 12, 2015
  7. Genetics

    Phenylketonuria, a Metabolic disease in humans, is caused by a recessive allele, k. If two heterozygotes marry and plan a family of six children: a)what is the probability that all will be unaffected? b)what is the probability that three will be unaffected

    asked on September 2, 2011
  8. Math

    Jade ran 6 times around her neighborhood to complete a total of 1 mile. How many times will she need to run to complete 5/6 of a mile?

    asked on September 15, 2016
  9. Math

    Which word best completes this statement? Adjacent angles are_______ congruent. A. Always B. Sometimes •• C. Never D. None of these Correct me

    asked on January 27, 2016
  10. statistics

    The distribution of scores on the SAT is approx. normal with mu= 500 and std dev=100. a)what proportion of the population have SAT scores above 650? b)what proportion of of the population have SAT scores below 540? c)what is the minimum SAT score needed to

    asked on February 7, 2008
  11. Physics

    What is the tension in the string in (Figure 1) ? The volume of plastic ball is 95 cm3 and the density is 840 kg/m3.

    asked on July 26, 2015
  12. Math

    An art class is planning to paint a rectangular mural with an area of 60 square feet. It has to be at least 4 feet high but no more than 6 feet high. The length and width have to be whole numbers. List all possible lengths for the mural.

    asked on March 16, 2015
  13. Geometry

    The wheel of an adult's bicycle has diameter 26 in. The wheel of a child's bicycle has diameter 18 in. To the nearest inch, how much farther does the larger bicycle wheel travel in one revolution than the smaller bicycle wheel?

    asked on April 4, 2011
  14. Math

    intersecting lines (1 point)40¨¬ 50¨¬ •• 140¨¬ 180¨¬ 2. Which word best completes this statement? Adjacent angles are ___________ congruent. (1 point)always sometimes •• never none of these 3. Which angle is adjacent to ¡ÐAFB? angles (1

    asked on January 27, 2016
  15. Chemistry

    Equation: Fe+CuCl2>FeCl2+Cu We put two iron nails into the copper chloride solution:1. mass of empty dry beaker:103.64 2. mass of two iron nails, before reaction:1.20 3. mass of two iron nails after reaction: 1.01 4. mass of beaker and copper (dry):104.4

    asked on February 16, 2014
  16. math

    1. In the middle of the page, draw two vertical lines an inch long, an inch apart, and that are parallel to each other. 2. About a half inch below the lines,draw a half inch horizontal line that is centered between the lines 3. Draw a line from the bottom

    asked on July 30, 2019
  17. Chemistry

    The temperature of a 12.58g sample of calcium carbonate increases from 23.6degrees celcius to 38.2 degrees celcius. If the heat capacity is 0.82J/g-K, how many Joules of heat are absorbed

    asked on June 18, 2013
  18. Statistics

    Electricity bills in a certain city have mean $108.73. Assume the bills are normally distributed with standard deviation $10.60. A sample of 47 bills was selected for an audit. Find the 46 percentile for the sample mean. Write only a number as your answer.

    asked on October 6, 2015
  19. physics

    If you drop a stone into a well that is d = 128.0 m deep, how soon after you drop the stone will you hear it hit the bottom of the well?

    asked on May 4, 2008
  20. Physics

    Hi, I've been stuck on this for days! I'd love if I can get some help. Two unfortunate climbers, roped together, are sliding freely down an icy mountainside. The upper climber (mass 80kg ) is on a slope at 16∘ to the horizontal, but the lower climber

    asked on April 3, 2015
  21. Math

    jim wants to put a wallpaper border around a rectangular room. The room measures 14 feet by 10 feet. If the wallpaper border comes in strips that are 20 feet long how many strips will jim need?

    asked on December 10, 2018
  22. P. Chemistry

    The equilibrium 2 SO2(g) + O2(g) 2 SO3(g) has the value K = 2.5 1010 at 500. K. Find the value of K for each of the following reactions at the same temperature. (a) SO2(g) + 1/2 O2(g) SO3(g) K = (b) SO3(g) SO2(g) + 1/2 O2(g) K = (c) 3 SO2(g) + 3/2 O2(g) 3

    asked on February 15, 2010
  23. Physics

    Hello!I was wondering if anybody had the time to help me with this question. I am not sure what equation to use with three polarizing filters! I thought we use Malus' Law, but doesnt seem to work. Any help would be greatly appreciated!! The question:

    asked on March 18, 2015
  24. english

    what sound devices does Dickinson employ in the phrase, "too cool for Corn", "But when a Boy, and Barefoot"? alliteration, slant rhyme

    asked on December 26, 2013
  25. science

    Any place inside a hachure line is a _____ elevation than the hachure line.

    asked on June 13, 2017
  26. Statistics

    A survey among freshman at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 15. A sample of 36 students was selected. What is the probability that

    asked on October 6, 2015
  27. finite mathematics

    A financier plans to invest up to $2 million in three projects. She estimates that Project A will yield a return of 10% on her investment, Project B will yield a return of 15% on her investment, and Project C will yield a 20% return on her investment.

    asked on October 23, 2015
  28. Social Studies

    During the 1920s, what were the various personalities of Canada, which personalities were dominant, which personality were starting to assert itself, and which personalities were still being ignored or mistreated? And "Personalities¡±here means Canada's

    asked on December 31, 2013
  29. Physics

    A mineshaft has an elevator hung from a single steel-wire cable of diameter 2.5 cm. Young's modulus of the cable is 10×1010N/m2. When the cable is fully extended, the end of the cable is 500 m below the support. How much does the fully extended cable

    asked on July 15, 2015
  30. Chemistry

    The observed general trend in ionization energies shows two slight discontinuities in each period. Examine the electron configuration at these points and explain why such a discontinuity may occur.

    asked on April 9, 2014
  31. solid mensuration

    A parabolic trough is 3 meters long, one foot across the top and one foot deep. Find the volume of water in the trough in liters if it is filled to a depth of 6inches.

    asked on May 12, 2011
  32. MATH

    The LRT trolley system 10 miles long is fed by two substations that generate 600 volts and 560 volts, respectively. the resistance of the trolley wire and rail return is 0.3 ohm per mile. if the car located 4 miles from the 600-volt station draws 200A from

    asked on March 10, 2016
  33. physics

    A car traveling at 20 m/s stops in a distance of 50 m. Assume that the deceleration is constant. The coefficients of friction between a passenger and the seat are µs = 0.5 and µk = 0.03. Will a 70-kg passenger slide off the seat if not wearing a seat

    asked on February 23, 2015
  34. Physics

    A 56 cm diameter wheel accelerates uniformly about its center from 130 rpm to 400 rpm in 3.2 s. (a) Determine its angular acceleration. Express your answer using two significant figures. (b) Determine the radial component of the linear acceleration of a

    asked on October 19, 2010
  35. Physics

    The two ropes shown in the bird's-eye view of (Figure 1) are used to drag a crate 3.7 m across the floor. How much work is done by the force fk→? How much work is done by the force T1→? How much work is done by the force T2→?

    asked on July 22, 2015
  36. math

    A particular style of shoes costs the retailer $80 per pair. At what price should the retailer mark them so he can sell them at a 20% discount off the original price and still make 35% profit on his cost?

    asked on October 25, 2018
  37. physics

    A quarterback is asked to throw a football to a receiver that is 32.1 m away. What is the minimum speed that the football must have when it leaves the quarterback's hand? Ignore air resistance. Assume the ball is caught at the same height as it is thrown.

    asked on September 6, 2010
  38. Ecology

    The experiment of Clausen, Keck and Hiesey discussed in lecture and illustrated in Fig. 4.4 of the textbook would be an example of a: a. common garden experiment b. reciprocal transplant experiment c. both of the above d. neither of the above Their

    asked on September 27, 2010
  39. Biology

    Which of the following is not a terminal electron acceptor in anaerobic respirations? a)nitrite b)carbon dioxide c)hydrogen sulfide d)sulfate e)nitrate Question 2 Which of the following is not an end product of fermentation? a)pyruvate b)none of the

    asked on September 10, 2010
  40. physics

    A driver in a car traveling at a speed of 70 mi/h sees a deer 90 m away on the road. Calculate the minimum constant acceleration that is necessary for the car to stop without hitting the deer (assuming that the deer does not move in the meantime).

    asked on August 22, 2010
  41. physics

    A biophysics student measures her reaction time by having a friend drop a meterstick between her fingers. The meterstick falls 0.300 meters before she catches it. (a) What is her reaction time? (b) Estimate the minimum average speed of nerve impulses going

    asked on January 26, 2016
  42. Physics

    I just want to be sure if my answers make any sense! A kid throws a ball in the air and catches it 5 seconds later a) What is the initial velocity of the ball? No air friction. b) What is the maximum height which the ball has reached above its departure

    asked on November 18, 2011
  43. Physics

    Question about doppler effect: How do you solve when it gives you percentage value? (Q 1) How do you calculate for doppler effect when the listener is moving instead of the source of sound? (Q 2) Questions 1. As a racing car zooms by you, its pitch

    asked on November 25, 2009
  44. math

    There are 24 students in a class. If 1/4 students wear glasses. How many students do not wear glasses? I multiply 24(1/4)=6 so 24-6=18 so is 18 students correct?

    asked on October 26, 2016
  45. Statistics

    The mean monthly rent for a one-bedroom apartment without a doorman in Manhattan is $2,651. Assume the standard deviation is $500. A real estate firm samples 100 apartments. What is the probability that the average rent of the sample is more than $2,708?

    asked on October 6, 2015
  46. Statistics

    Suppose that the weight of male babies less than 2 months old is normally distributed with mean 11.5 pounds and standard deviation 2.7 pounds. A sample of 36 babies is selected. What is the probability that the average weight of the sample is less than

    asked on October 6, 2015
  47. physics

    The force exerted by the wind on the sails of a sailboat is 370 N north. The water exerts a force of 210 N east. If the boat (including its crew) has a mass of 270 kg, what are the magnitude and direction of its acceleration?

    asked on September 6, 2010
  48. Chemistry

    What reactions occur in the sun? Select all that apply. A: Fusion Occurs B: Helium is Consumed C: Hydrogen is Consumed D: Fission Occurs

    asked on September 6, 2019
  49. Physics

    Suppose you have a very long straw that can reach from a cup of water on the ground level to the top of a very tall building. When you use a pump to suck on the straw in order to bring water up, a. you can bring the water up to any height with no problem.

    asked on January 18, 2013
  50. Chemistry

    Suppose that the microwave radiation has a wavelength of 12.4 cm. How many photons are required to heat 255 mL of coffee from 25.0 C to 62.0 C? Assume that the coffee has the same density, 0.997 g/mL, and specific heat capacity, 4.184 J/(g/ K), as water

    asked on October 27, 2010
  51. physics

    a 16.0-g bullet is shot into a wooden block at rest with mass 4550g on a frictionless surface. the block moves 1.20m/s after the bullet strikes and becomes lodged in the block. find the speed of the bullet before striking the block.

    asked on April 7, 2015
  52. Physics

    If a discus thrower rotates through the last 45 degrees of a turn in .11 seconds and the distance from the axis of the rotation to the center of the discus is 1.22 m, what is the average linear velocity of the discus?

    asked on November 4, 2009
  53. Chemistry

    Equation: Fe+CuCl2>FeCl2+Cu The ratio of moles of copper produced to moles of iron reacted should be 1:1,but I get 60:17 in lab,can you state at least 3 errors for me?

    asked on February 16, 2014
  54. Biology

    What are the three reaction pathways which pyruvate undergoes in the metabolic pathways inside the cell and what are the names of the final products of each of these pathways?

    asked on October 26, 2011
  55. English

    People who attract a lot of friends are neither negative nor needy. Do I need to change this sentenance so that both parts are parallel?

    asked on August 24, 2011
  56. Statistics

    According to one survey, the mean serum cholesterol level for U.S. adults was 195.1, with a standard deviation of 41.5. A simple random sample of 95 adults is chosen. Find the 46 percentile for the sample mean. Write only a number as your answer. Round to

    asked on October 6, 2015
  57. Genetics

    A homozygous pea plant with round peas and yellow cotyledons was crossed to a wrinkled, green plant. The F1 was selfed and produced: 193 round, yellow 69 round, green 64 wrinkled, yellow 26 wrinkled, green a) propose hypothesis that allows you to calculate

    asked on September 2, 2011
  58. Trigonometry

    How to memorize the sum-to-product and product-to-sum formulae more easily ?? I know how to deduce the formula but when i try to memorize it, its so hard. Always sin, cos, a+b, a-b, i always get confused. Is there any way to memorize more efficiently??

    asked on July 21, 2008
  59. Chemistry

    Determined at which temperature is the solubility of KNO3 at 60 grams per 100 grams of water

    asked on November 16, 2015
  60. math

    A professor grades students on three tests, four quizzes, and a final examination. Each test counts as two quizzes and the final examination counts as two tests. Sara has test scores of 60, 80, and 89. Sara's quiz scores are 85, 94, 83, and 84. Her final

    asked on March 24, 2013
  61. Physics

    What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1000g at a radius arm of 15.0cm?

    asked on October 31, 2010
  62. P. Chemistry

    A solution of HNO2 is at equilibrium: HNO2(aq) + H2O(l) ⇔ H3O+(aq) + NO2-(aq) Water is added. After the water is added, is there any shift in the equilibrium?

    asked on March 8, 2010
  63. Spanish II

    Hi! I have completed this assignment but I felt like I was guessing throughout the whole thing. Since I could not underline I instead put 5 periods and the numbers instead; the answers are below the paragraph. Is this paragraph correct? Complete the

    asked on January 27, 2015
  64. Chemistry

    If the tongs used in the experiement were made of pure iron, what might happen if the tongs were allowed to remain in contact with the CuCl2 solution?

    asked on February 16, 2014
  65. physics

    A quarterback is asked to throw a football to a receiver that is 32.1 m away. What is the minimum speed that the football must have when it leaves the quarterback's hand?

    asked on September 6, 2010
  66. math

    you need 1 1/4 cups of sugar to make 20 cookies. to make 6 cookies, you need___ cups of sugar?

    asked on April 27, 2016
  67. physics

    one car of mass 15.0kg is moving 5.00m/s to the right on a frictionless track and collides with a cart of mass 3.00kg. the final velocity of the carts that become stuck together after the collision is 1.50m/s to the right. find the velocity of the second

    asked on April 7, 2015
  68. physics

    an archer shoots an arrow into a piece of wood. the arrow is traveling at 120km/h when it strikes the wood. the arrow penetrates 3.8cm into the wood before stopping. what is its average acceleration (in m/s squared) into the wood?

    asked on April 6, 2015
  69. Physics

    Hello to all the fantastic tutors! I'm stuck on this question, I was wondering if there is a way to solve this. A car horn emits 378Hz sound. If the car moves at 23m/s with its horn blasting, what frequency will a person standing in front of the car hear?

    asked on March 10, 2015
  70. Trigonometry

    Prove the identity sin(x+y+z)+sin(x+y-z)+sin(x-y+z)+ sin(x-y-z) = 4 sin(x)cos(y)cos(z) This identity is so long and after i tried to expand the left side and it just looked something crap Thanks for you help :)

    asked on July 19, 2008
  71. Chemistry

    The multiple Choice Question: Determine delta G (free energy at standard condition s) for the reaction below, considering Kp = 8 at 25 degrees celcius. 2Ag -> B The answer Choices: A.-2.303 x (0.287) x (25) x log 8 [J] B.-2.303 x (8.314) x (25) x log 8 [J]

    asked on April 22, 2007
  72. English

    Here are some quotes in Pride and Prejudice, can you help me to analyze it, remember to write it in your own words, I'm not good at analyzing, so... 1. It is a truth universally acknowledged, that a single man in possession of a good fortune, must be in

    asked on February 27, 2014
  73. physics

    A 200.0 N force moves a 120.0 kg crate on a friction less surface from rest to final speed of 9.6 m/s. what is the displacement of the crate at the time it reaches this speed ?

    asked on January 12, 2013
  74. Biochemistry

    A buffer is made at pH 7.3. 0.15 M using imidazole And 1 M hydrochloric acid to form the buffer. Can you show calculations for the formation of 500 mls of this buffer?

    asked on September 7, 2011
  75. Physics

    1) Suppose that you wish to fabricate a uniform wire out of 1.15 g of copper. Assume the wire has a resistance R = 0.600 , and all of the copper is used. (a) What will be the length of the wire? m? (b) What will be the diameter of the wire? µm? 2) A

    asked on October 4, 2010
  76. Physics

    Hey can someone help me out? I only have 1 attempt left on this question and do not understand it at all!!! A 3.5 kg balloon is filled with helium ( density = 0.179 kg/m^3). If the balloon is a sphere with a radius of 5.2m , what is the maximum weight it

    asked on December 3, 2009
  77. newletter ideas

    what are some classroom activities for grade 3-6?

    asked on May 3, 2009
  78. physics

    (a) In 2009, Usain Bolt ran the last 100 meters of the 150-meter race in 8.70 seconds. What is Usain Bolt’s speed? (b) The world record for the 100-meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a

    asked on January 26, 2016
  79. Genetica

    Say a normal woman, whose father had hemophilia, marries a normal man. Do you know what would be the probability that their first child will have hemophilia and could you explain it to me? I'm clueless

    asked on September 9, 2011
  80. Math

    1.x(x-3)=4 means that x=4 and x-3=4 Is that right? 2.Is the sum of squares prime???

    asked on December 4, 2010
  81. Physics

    ) A car is traveling on a straight, horizontal road at 20 m/s when the driver slams on the brakes. The force of friction between the car and the road is 900 N. The mass of the car is 1800 kg. (a) Make a free body diagram for the car on the set of axes

    asked on November 4, 2016
  82. Chemistry

    50.00mL of 0.250M hydrochloric acid was added to 25.00mL of 0.300M potassium hydroxide. Calculate the pH of the resulting solution.

    asked on June 12, 2016
  83. Language Arts

    Are you – Nobody – too? Then there’s a pair of us! Don’t tell! they’d banish us – you know! How dreary – to be – Somebody! How public – like a Frog – To tell one’s name – the livelong June – To an admiring Bog! 4. What is a

    asked on January 26, 2016
  84. Algebra 1

    A teacher buys 50 train tickets for a school trip for a total cost of $1,200. She buys x number of student tickets for $20 each. She also buys y number of adult tickets for $30 each.

    asked on August 26, 2015
  85. I don't understand how you did it help

    A $4000 deposit at an APR of 5.6% with a quarterly compounding for 8 years . The amount after 8 years would be ???

    asked on January 27, 2013
  86. algebra

    the body mass index ,I,can be used to determine an individuals risk for heart disease. An index less then 25 indicates a low risk. The body mass index is given by the formula,or model,I=700w/h2, where w = weight,in pounds,and H=height,in inches.Jerome is

    asked on August 1, 2011
  87. physics

    PLEASE I HAVE NO IDEA WHERE TO START A quarterback is asked to throw a football to a receiver that is 32.1 m away. What is the minimum speed that the football must have when it leaves the quarterback's hand? Ignore air resistance. Assume the ball is caught

    asked on September 7, 2010
  88. physics

    A model rocket is launched straight upward with an initial speed of 60.0 m/s. It accelerates with a constant upward acceleration of 2.00 m/s2 until its engines stop at an altitude of 130 m. (a) What is the maximum height reached by the rocket? (b) How long

    asked on September 7, 2010
  89. Chemistry (conceptual question)

    If you have a soln of HNO2 at equilibrium HNO2 (aq) + H20 (l) H3O+ (aq) + NO2- (aq) and water is added, is there a shift in the equilibrium? Can someone explain why to me? I have a hard time understanding the concept of equilibrium and what is part of the

    asked on February 19, 2010
  90. Accounting-business

    Here is the other part that did not fit on the other post. Lear, Inc. has $800,000 in current assets, $350,000 of which are considered permanent current assets. In addition, the firm has $600,000 invested in fixed assets. a. Lear wishes to finance all

    asked on June 16, 2009
  91. World Religions

    Buddhism - Two of the most important teachings for Mahayana Buddhists are the Diamond Sutta and the Lotus Sutta. Diamonds and lotuses are beautiful. Why do you think Mahayana Buddhists gave these names to two suttas?

    asked on December 10, 2008
  92. Trigonometry

    in triangle abc, if sin c= (sin a + sin b )/ ( cos a + cos b ) prove that triangle abc is a right-angle triangle.

    asked on July 13, 2008
  93. mechanical

    A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a)

    asked on November 16, 2016
  94. Physics

    A transverse wave 1.1cm in amplitude is propagating on a string; the wave frequency is 44 Hz. The string is under 23-N tension and has mass per unit length of 16g/m . What is the wave speed? What I've done: using sqrt(Tension/mass_per_unit):

    asked on March 5, 2015
  95. Physics-Intro

    A 0.600-kg ball traveling 4.00 m/s to the right collides with a 1.00-kg ball traveling 5.00 m/s to the left. After the collision, the lighter ball is traveling 7.25 m/s to the left. What is the velocity of the heavier ball after the collision?

    asked on October 7, 2014
  96. economics

    A research firm calculated that students who attend University spend about $2,760 each in the local economy for a total of $50.45 million. In total, the impact of their spending on the local economy is £63 million. Calculate the size of the student

    asked on May 17, 2013
  97. statistics

    An oil change shop advertised to change oil within 15 minutes. Based on the data collected on a typical day, what is the probability that oil change will take 15 minutes or less time? Based on the data, do you think the business claim is valid? Explain why

    asked on April 18, 2013
  98. Help math

    $4000 invested at an APR of 9% for 10 years What is the amount of money after 10 years

    asked on January 27, 2013
  99. Calculus 1

    Evaluate the following limits after identifying the indeterminate form. Use Hospital's rule. d) lim x_0+ (xe^(2x) + 1)^(5/x) e) lim x_(Pi/2)+ (1 + sec3x)^(cot3x) Thank you!

    asked on April 26, 2012
  100. Algebra

    Find the vertex of the function. Write your answer in the form (x,y). Use the slash mark as a fraction bar if necessary. y=x^2-x-23

    asked on June 20, 2011


  1. 1
  2. 2
  3. 3