1. Physics

    A 90 m long train begins uniform acceleration from rest. The front of the train has a speed of 21 m/s when it passes a railway worker who is standing 184 m from where the front of the train started. What will be the speed of the last car as it passes the

    asked by Sydney on September 13, 2011
  2. math

    A pilot can fly an MD-11 2160 miles with the wind in the same time she can fly 1920 miles against the wind. If the speed of the wind is 30 mph, find the speed of the plane in still air.( Source: Air Transport Association of America)

    asked by val on December 4, 2012
  3. Phyics

    A rubber ball with a radius of 4.8 cm rolls along the horizontal surface of a table with a constant linear speed v. When the ball rolls off the edge of the table, it falls 0.83 m to the floor below. If the ball completes 0.68 revolutions during its fall,

    asked by Andrew on October 19, 2008
  4. physics

    A 1 kg steel ball strikes a wall with a speed of 9.99 m/s at an angle of 55.1 ◦ with the normal to the wall. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.292 s, what is the magnitude of the average force

    asked by Anonymous on October 7, 2008
  5. Physics

    I have a question that I don't understand, could you please help me? Thanks! Heres my question: A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is Isn't the

    asked by Soly on August 19, 2007
  6. MATH (DUN DUN DUN!!!!)

    Carter left Town A at noon, driving toward Town B at an average speed of 50 mph. At 12:30 P.M., Max headed from Town B to Town A along the same road. At 3 P.M., they met each other along the way, and Carter realized that he had completed 60% of his

    asked by dannyboi on August 1, 2018
  7. Physics

    For anti-ballistic missile system, the time of flight tf is determined by the initial speed v0 of the missile and the range R. What is the time (in minute) of the flight tf available to kill an incoming intercontinental ballistic missile launched from

    asked by Maxx on October 2, 2011
  8. Physics

    An aircraft moving horizontally at a speed of 80m/s and at a height of 500m releases a bomb to destroy a tank moving away from it. If the bomb is released when the tank is at a horizontal distance of 600m from the aircraft, find the speed of the tank.

    asked by Celine on November 4, 2014
  9. Social Studies

    Even though the United States had just had its own revolution to overthrow a colonial power, it did not support the revolution in Haiti because, A. The united states regretted breaking with England because of the economic problems it caused. B. The united

    asked by HoneyKitty on December 12, 2017
  10. Astronomy

    Orbital speed is the speed with which a planet moves around the sun. The speed is determined by: a)the mass of the planet only b) the mass of the sun only c)both the mass of the planet and the mass of the sun d)the mass of the planet and it's distance from

    asked by Ales on August 29, 2010
  11. Math

    Jenny's lawn is 1/3 of an acre. After moving 1/2 of the lawn, how much of an acre has she mowed? A. 1/5 B. 1/6 C. 1/2 D. 2/5 ______________________________ A leaking bucket is filled to 3/4 capacity. After some time, 1/2 of the water has leaked out. What

    asked by Lyññ on December 31, 2016
  12. Math

    Jenny's lawn is 1/3 of an acre. After moving 1/2 of the lawn, how much of an acre has she mowed? A. 1/5 B. 1/6 C. 1/2 D. 2/5 ______________________________ A leaking bucket is filled to 3/4 capacity. After some time, 1/2 of the water has leaked out. What

    asked by RiGht ur life on December 10, 2018
  13. trig

    A 52-foot wire running from the top of a tent pole to the ground makes an angle of 57° with the ground. If the length of the tent pole is 44 feet, how far is it from the bottom of the tent pole to the point where the wire is fastened to the ground? (The

    asked by janice on November 16, 2012
  14. Computer Science

    Project 2 is a continuation of Project 1. Modify the code from Project 1 to read and process information from a file named Computers.txt. The text file contains profiles about a set of computers. Each computer should be processed. The text file contains

    asked by Anonymous on March 30, 2019
  15. Language Arts Help!!!

    Choose the best paraphrase of the lines from the limerick. Said the fly “Let us flee.” / “Let us fly.” said the flea. / So they flew through a flaw in the flue. A) The 2 insects had to get out, so they flew through the chimney even though it was

    asked by Brooklyn/Connexus Girl on February 2, 2018
  16. Financial Accounting 1

    Maximus Dog Company purchased a new supply van on January 1, 2011, for $35,000. The van is estimated to last for five years and will then be sold, at which time it should be worth approximately $5,000. The company uses straight- line depreciation and has a

    asked by Anonymous on April 25, 2013
  17. Biology - URGENT Enzyme Lab

    Did a catalase producing hydrogen peroxide lab, used manganese dioxide, fresh frozen liver, potato, ice, fine clean sand, etc. Basically just added hydrogen peroxide to the catalysts under diff conditions and stuff. Just don't get this question which is :

    asked by Shreya on April 5, 2013
  18. Physics

    A box is being moved with a velocity (v) by a force (p)(parallel to v) along a level horizontal floor. The normal force is (Fn), the kinetic frictional force is (fk), and the weight of the is box is (mg). Draw a free-body diagram of this situation

    asked by Amy on February 13, 2012
  19. Technology

    Is there anyone who can double check this for me? 21. You have learned that there are seven inputs common to all technological systems. List these inputs and give an example for each one. 21. There are seven inputs that are common to all technological

    asked by y912f on April 8, 2010
  20. Physics

    A golfer hits a shot to a green that is elevated 3.10 m above the point where the ball is struck. The ball leaves the club at a speed of 19.4 m/s at an angle of 33.0˚ above the horizontal. It rises to its maximum height and then falls down to the green.

    asked by Tami on October 17, 2014
  21. PHYSICS LEC

    please help...i need this immediately.. rolling friction. two bicycles are set rolling with the same initial speed of 3.50m/s on a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is inflated to a

    asked by josh on August 16, 2010
  22. physics

    A uniform solid sphere of mass M and radius R is rolling without sliding along a level plane with a speed v = 2.30 m/s when it encounters a ramp that is at an angle è = 27.6° above the horizontal. Find the maximum distance that the sphere travels up the

    asked by Anonymous on October 22, 2010
  23. Physics

    A race car starts from rest on a circular track of radius 507 m. The car's speed increases at the constant rate of 0.790 m/s2. At the point where the magnitudes of the centripetal and tangential accelerations are equal, find the following. (a) the speed of

    asked by Ed on November 30, 2009
  24. Physics

    A uniform solid sphere of mass M and radius R is rolling without sliding along a level plane with a speed v = 2.70 m/s when it encounters a ramp that is at an angle è = 20.4° above the horizontal. Find the maximum distance that the sphere travels up the

    asked by Donny on October 16, 2010
  25. Math

    A girl leaves her home A at 9am, and after cycling for 25km at 5km/h she reaches her destination B at 2pm. After having lunch at B for 90 minutes, she sets off for home. On the way home she stops for half an hour to see a friend who lives at C, which is

    asked by Anonymous on July 22, 2016
  26. physics

    A 0.0150 kg, 2.09 m long wire is fixed at both ends and vibrates in its simplest mode under a tension of 214 N. When a tuning fork is placed near the wire, a beat frequency of 5.20 Hz is heard. What are the possible frequencies of the tuning fork? I solved

    asked by Anonymous on November 26, 2009
  27. Physics

    bob drop a rock from a height of 4.5 m. (the acceleration due to gravity is 9.8 m/s^2) 1.at s the initial speed of the rock 2. how long is the rock falling before it hits the ground c. what is the final speed of the rock? [I have trouble with c) My work:

    asked by Ash on December 1, 2014
  28. physics

    Suppose the stone is thrown at an angle of 40.0° below the horizontal from the same building (h = 42.0m) as in the example above. If it strikes the ground 36.7 m away, find the following. (Hint: For part (a), use the equation for the x-displacement to

    asked by mike on May 20, 2016
  29. Physics

    At the 18th green of the US Open, Tiger Woods needs to make a 20.5 ft (6.25 m) birdie putt to win the tournament. When he hits the ball, giving it an initial speed of 1.57 m/s, it stops 6.0 ft. (1.83 m) short of the hole. Assume the deceleration caused by

    asked by Tonya on September 15, 2013
  30. physics

    In 1976, the Lockhead SR-17A Blackbird set the record speed for any airplane: 3.53x10^3 km/h. suppose you observe this plane ascending at this speed. For 20.0s, it flies at an angloe of 15.0 degrees above the horizontal, then for another 10.0s its angle of

    asked by jack on October 25, 2011
  31. science

    A science student drops a rok down a mine shaft. It takes 3 sec. for the rock to hit the bottom of the shaft , at what speed of the rock just before impact? 32 feet per second per second is the acceleration rate of earth. At the end of second 1 the speed

    asked by pat on October 24, 2006
  32. Physics

    As part of a daring rescue attempt, the Millennium Eagle coasts between a pair of twin asteroids, as shown in the figure below where d1 = 2.55 km and d2 = 1.28 km. The mass of the spaceship is 2.53 x10^7 kg and the mass of each asteroid is 3.70x10^11 kg.

    asked by A on October 21, 2016
  33. Art Please Help I need this answered by 8:10 Pm 2n

    I need help. I got the answers of 1-3. but I don't know what 4-5 are. 4. The Willows of Marissel by Jean-Baptiste- Camille Corot. Which elements helps to give the illusion of great height and reaching upwards? A. the color of the painting B. the lines made

    asked by Destiny on September 27, 2017
  34. physics

    If the electric potential energy between two charges of 1.5C and 6.0 C is 0.16 J, what is their separation?

    asked by myra on May 15, 2012
  35. science

    What is the difference between radiant, solar, and thermal energy? Thanks

    asked by Don on February 19, 2009
  36. Math

    How much energy, in joules, is released by an earthquake of magnitude 3.4?

    asked by Clare on December 14, 2013
  37. science

    How much energy is required to lift a 40.00 kg bag of sand 1.02 m

    asked by Bethany on April 5, 2018
  38. science

    Where in nature could you find a source of energy just like batteries

    asked by Kyla on February 19, 2009
  39. Physics

    What is the difference between radiant, solar, and thermal energy? Thanks

    asked by Don on February 19, 2009
  40. chemistry

    if 150g of Ca(OH)2 is reacted with excess H2, how much energy will be needed?

    asked by Vilika on January 9, 2011
  41. Physics

    An electron has a total energy of 2.8 MeV. What is its momentum?

    asked by Anonymous on May 6, 2009
  42. yh8hy

    why energy from the sun is important to the water cycle?

    asked by juan on November 8, 2007
  43. quick Science question

    How is the energy in sunlight used? I need help on this question especially since I don't have a textbook.

    asked by Stacie on April 25, 2009
  44. renewable energy

    If you (64) are standing on a 72 m hill, what is you potential energy? (gravity = 9.81 m/s)

    asked by christian on January 29, 2011
  45. chemistry

    what happens to energy released by an exothermic enthalpy change??

    asked by Jasmine on October 18, 2011
  46. science

    how can nuclear energy be used for heating and cooling a house?

    asked by Anonymous on January 6, 2014
  47. physical science

    How much energy is stored in a 9V battery rated at 10 A hour?

    asked by jake on April 12, 2013
  48. science

    how do cells use food using big idea of energy

    asked by bob on October 16, 2011
  49. renwewable energy

    How much energy is required to accelerate a 8000 kg car from 14 km/h to 95 km/h?

    asked by christian on January 29, 2011
  50. physics

    Give ten [10] energy transformation processes

    asked by MATTHEW GOWOK POLIT on November 18, 2012
  51. Physical Science

    What is the question that many have about the Department of Energy and Yucca Mountain

    asked by Harold on December 2, 2013
  52. science

    which of the following is a consequence of using fossil fuels as an energy source

    asked by Anonymous on December 6, 2013
  53. Physics

    Is internal energy of cooling curve decrease ?

    asked by Aboodi on November 9, 2017
  54. Biology

    Are prokaryotes able to live on inorganic energy sources?

    asked by Zukii on January 16, 2011
  55. science

    Why is it impossible to build a machine that produces more energy than it uses?

    asked by yanira on November 16, 2007
  56. Physical Science

    how much energy must be removed from 1 L of water at 25 C and turn it to ice at -10 C?

    asked by Christina on September 23, 2015
  57. chemistry

    What is the energy of green light with a wavelength of 5.50x10^-7m?

    asked by riley on October 11, 2010
  58. chem

    why does fluorine have a higher ionization energy than iodine?

    asked by samuel on January 24, 2010
  59. Chemistry

    Why is ionization energy for calcium greater than that for potassium?

    asked by mariana on August 4, 2013
  60. Chemistry

    What is the energy of an electron in the 2s orbital of a hydrogen atom?

    asked by Zack on February 9, 2009
  61. Science

    how is energy produced during a nuclear fusion reaction?

    asked by Suzy on June 1, 2014
  62. SCIENCE

    HOW MUCH HEAT ENERGY TRANSFERRED TO THE COLD WATER

    asked by LINDSEY on November 15, 2011
  63. physical science

    what is the kenetic energy of a 5-kg grocery cart moving at 7m/s?

    asked by Danielle on November 12, 2007
  64. science

    what would i say in a paragraph using the word contrasting with 2 types of energy?

    asked by Anonymous on October 7, 2010
  65. Earth Science

    Does energy flows through the Earth's system by heat?

    asked by Matt on September 28, 2012
  66. science,

    how does a nuclear power plant produce energy

    asked by Young Trippy Lil G on April 4, 2017
  67. Science

    One last question... How can energy from the sun transfer into your body? Thank you!

    asked by Ashley on June 7, 2009
  68. chemistry

    why does chlorobenzene have a hogher bond energy than 1-bromobutane?

    asked by stacey on April 22, 2010
  69. microbiology

    Which are the two other pathways necessary to obtain enough energy to accomplish the task?

    asked by heidi on February 26, 2011
  70. chem

    energy of a proton divided by its frequency equals?

    asked by rob on October 23, 2011
  71. SCI

    What are some challenges using and managing renewable energy resources? What are the challenges with managing non-renewable energy resources?

    asked by Anonymous on February 21, 2008
  72. science

    how do cells use food using big idea of energy

    asked by bob on October 16, 2011
  73. science

    Does work transfer energy as the result of motion

    asked by laura on April 28, 2009
  74. chemistry

    Which of the following elements would have the largest third ionization energy: K, Ca, Ga? What is third? Thanks in advance.

    asked by sh on April 29, 2009
  75. SCIENCE

    What energy changes occur in a in a solar powered car?

    asked by iluv2cheer on May 25, 2009
  76. science

    explain how energy is stored in and released from atp

    asked by zac on November 13, 2007
  77. Physical Science

    Describe how energy flows through the ecosystem near oklahoma

    asked by Harold on December 1, 2013
  78. chemistry

    how much energy is needed to melt 25.4 g of I2 if enthalpy fusion of I2 is 61.7 J/g

    asked by Anonymous on March 8, 2012
  79. Health Physics

    When work is done by friction, in what form in energy "lost"?

    asked by Shannon on January 22, 2010
  80. science

    HOW MUCH HEAT ENERGY TRANSFERRED TO THE COLD WATER

    asked by LINDSEY on November 15, 2011
  81. physics

    The energy of a sound wave is most closely related to its?

    asked by Darren on April 2, 2019
  82. science

    the energy role of the first organism in a food chain is always

    asked by babygirl on May 19, 2017
  83. chemistry

    Determine the energy of a photon with a wavelength of 6.74 ✕ 102 nm.

    asked by aaliyah on November 9, 2013
  84. ecology

    what is the relationship between feeding levels and the amount of energy available?

    asked by tashi on September 20, 2008
  85. quick chem

    Which of the following wavelengths of light has the highest energy? 1. 10 mm 2. 650 nm 3. 10 µm 4. 0.1 nm 5. 10 cm

    asked by Thad on February 11, 2013
  86. chemistry

    what is the difference between electron affinity and ionization energy?

    asked by Jeremy on January 24, 2010
  87. Science

    which is not a from of energy ? light temperature electricity heat

    asked by Miley on January 9, 2011
  88. science

    How can geothermal energy affect the use of fossil fuels?

    asked by reiley on March 13, 2016
  89. Chesitry

    Calculate the energy needed to melt 50.0 L of nitrogen (N2).

    asked by Simon on May 12, 2010
  90. Science

    Considering matterand energy together the smallest component of the universe seems to be

    asked by Siedah on February 16, 2009
  91. Chemistry

    calculate the energy associated with a photon whose wavelength is 14.5*10^-8cm.

    asked by Albert on October 31, 2011
  92. Science

    What are some challenges using and managing renewable energy resources? What are the challenges with managing non-renewable energy resources?

    asked by Anonymous on February 21, 2008
  93. biology

    how are energy and enzymes involved in biochemical reactions

    asked by ajdgnajsdlgsdg on December 13, 2010
  94. chemistry

    Do nonmetals have a higher or lower ionization energy?

    asked by Anonymous on December 1, 2008
  95. physic

    what form of energy can be coverted from sound to light?

    asked by KO on November 30, 2016
  96. chemistry

    the number of dorbitals in the second prinicipal energy level ?

    asked by caleb on May 6, 2008
  97. science

    find the energy of first excited state of helium

    asked by annie on April 22, 2016
  98. Wind energy

    How does wind energy get to you? Like I know you would have to have a mill in your yard but how does it get to the house?

    asked by Randi on December 13, 2007
  99. Chemistry

    What is the ionization energy (in kJ/mole) of the hydrogen-like ion F8+ ?

    asked by Marissa on December 5, 2010
  100. SCIENCE - CLIMATE - ALBEDO

    what is the connection between the amount of albedo and energy absorbed?

    asked by Lenny on February 21, 2010

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  451. 451
  452. 452
  453. 453
  454. 454