1. Physics

    An electrical cable is atteched to the electrical pole 25m apart. The cable weighs 2.5N/m and can resist a pull of 300N . assuming that the cable takes a parabolic shape, detrmine the smallest value of sag in the cable
  2. Physics

    Electrons in a beam incident on a crystal at an angle of 300 have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5A0, and the reflected electrons are passed through a slit .Find the velocities of the
  3. physics

    Electrons in a beam incident on a crystal at an angle of 300 have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5A0, and the reflected electrons are passed through a slit .Find the velocities of the
  4. Physics

    Electrons in a beam incident on a crystal at an angle of 300 have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5A0, and the reflected electrons are passed through a slit .Find the velocities of the
  5. Social Studies

    In which hemisphere is North America located? NOrthern Hemisphere Which hemispheres contain parts of both the Atlantic and Pacific oceans North west south and east Which hemisphere contains all of Antarctica southern? What is the name of the line that
  6. physics

    Peggy drives from Cornwall to Atkins Glen in 46 min. Cornwall is 73 km from Illium in a direction 29° west of south. Atkins Glen is 26.3 km from Illium in a direction 20° south of west. Use Illium as your origin. Find the displacement during the trip in
  7. Ms. Sue Please Check My Answers!

    1. During the early 1800s, what did New England's textile industry and cotton farming in the South have in common? A.) Changes in technology led to increased production in both regions B.) Children worked in the textile industry; slaves of all ages worked
  8. physics

    Displacement vectors A, B, and C add up to a total of zero. Vector A has a magnitude of 1550 m and a direction of 22.9° north of east. Vector B has a direction of 41.0° east of south, and vector C has a direction of 35.2° north of west. Find the
  9. math

    A 6 ft pole casts a shadow of 8ft long while a nearby flagpole casts a shadow of 56 ftlong. What is the height of the flagpole?
  10. math

    how high is a tree that cast a 48ft shadow at the time a 12 ft pole cast a shadow which is 12 ft long. the tree hight is?
  11. Math

    How high is a wall that casts a 10ft shadow @ the same time that a 6ft flag pole casts a 6ft shadow
  12. math

    How high is a wall that casts a 15ft shadow at the same time that a 4ft flag pole casts a 4ft shadow?
  13. Social Studies

    How did improvements in transportation, communication, farming, and manufacturing affect the economy of the North? Break down your answer by providing an example of advancement in each of the four areas. Then discuss how that improvement led to changes in
  14. DBQ Essay

    I'm writing a paragraph in my DBQ about how the North and South divided over the issue of slavery. The North and South were divided over the issue of slavery. that's all i got ... BUT document 4 explains the divide over slavery which is related to the
  15. Astronomy

    1. Imagine that the Earth¡¦s spin were to be reversed, so that the planet rotated about its axis from East to West, at the same rate at which it now rotates from West to East. If Earth¡¦s orbital motion about the Sun were unchanged, which of these
  16. History

    (PLEASE ANSWER ASAP) Read the paragraph, which may contain errors or false beliefs about the Civil War: Maryland was an important state in the Civil War. Due to its location, it was the key to the North maintaining control of its capital, Washington, D.C.
  17. Chemistry

    Core electrons shield what from the pull of the nucleus? A. Identical electrons B. Valence electrons C. Neutrons D. Protons I was thinking d or a.
  18. chemistry- thank you

    How many valence shell electrons are there in a ground state silicon atom? Am i suppose to just count the electrons after the core electrons?
  19. physics

    A 512 kg satellite is in a circular orbit about the Earth at a height above the Earth equal to the Earth's mean radius. (a) Find the satellite's orbital speed. (b) Find the period of its revolution. (c) Find the gravitational force acting on it.
  20. Science - Please Check my Answer

    My problem: A swimmer travels from the south end to the north end of a 30.0 m pool in 15.0 s and makes the return trip to the starting position in 19.0 s. What is the average velocity for the second half of the swim? My answer: 1.60 m/s to the south Please
  21. history

    how were the south and the north the same?
  22. Chemistry

    A weather ballon is prepared to lift off at the North Pole. The balloon is filled with 15000 L of helium gas. The conditions at the launch site are 760 mm Hg and 0 degrees celsius. The balloon is then released and rises to a height of 20,000 m. The
  23. Science

    .a sodium atom has the following distribution of electrons in its energy cells: shell1: 2 electrons shell2: 8 electrons shell3: 1 electron I think its shell 2
  24. History

    1. Why was the presidency of George Washington considered to be so significant? A His actions would define the role of the Supreme Court B His actions would set precedents for all future presidents C His actions would determine the need for a president ***
  25. Algebra

    One more rectangular-shaped piece of metal siding needs to be cut to cover the exterior of a pole barn. The area of the piece is 30 ft². The length is 1 less than 3 times the width. How wide should the metal piece be? Round to the nearest hundredth of a
  26. Science

    Predict what would happen to the weather in the north-eastern united states if the polar jet stream dipped to the south. How would the weather change if the jet stream moved to the north?
  27. Physics

    A plane head north with an airspeed of 420 km/h. However, relative to the ground, it travels in a direction 7.0 west of north. if the wind's direction is towards the southwest (45.0 south of west), what is the wind speed?
  28. physics 180

    a hiker travels north at 200m/s north and then turns and travels 200 m/s south. what is: a) the average speed b) the average velocity c) the magnitude and direction in change in velocity
  29. physics

    A river flows due east at 2.00 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 11.0 m/s due north relative to the water.
  30. physics

    A river flows due east at 1.34 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 11.3 m/s due north relative to the water.
  31. physics

    the rotation of earth is a period of 86164 seconds. the earth has a radius of 6380 km. how fast would you be moving due to earths rotation at the equator? also how fast would you be moving at a latitude of 27 degrees north of the equator? also calculate
  32. Social Studies

    Caribbean South America has A) A predominantly arid climate B) Varied climate zones due to coastal and highland areas C) An arid climate in the north and a wet climate in the south D) Mountain climates determined by elevation**** Thanks for the help
  33. physics

    A boxcar of mass 3.21 x 10^4 kg is rolling south at 5.16 m/s when it collides and couples with another boxcar of mass 5.18 x 10^4 kg that is rolling north at 2.38 m/s. What is the velocity of the coupled boxcars after collision? Take north as positive and
  34. social studies

    I need help checking my answers for social studies. the !!! stands for my answer 1. how did northern and southern responses to the fugitive slave law affect their relationship? it deepened fear and anger between the north and the south. !!! it deepened the
  35. Physics

    A 325 kg boat is sailing 15.0 degrees north of east at a speed of 2.00 m/s. Thirty seconds later, it is sailing 35.0 degrees north of east at a speed of 4.00 m/s. During this time three forces act on the boat: a 31.0 N force directed 15.0 degrees north of
  36. math

    A 12-foot flagpole casts a nine-foot shadow. What is the measure from the top of the shadow to the top of the flag pole? 15 21 3 6
  37. Physics

    A person desires to reach a point that is 2.80 km from her present location and in a direction that is 35.0° north of east. However, she must travel along streets that are oriented either north-south or east-west. What is the minimum distance she could
  38. physics

    A person desires to reach a point that is 1.70 km from her present location and in a direction that is 40.0° north of east. However, she must travel along streets that are oriented either north-south or east-west. What is the minimum distance she could
  39. physics

    The electron gun in a color TV accelerates the electrons through about 25,000 Volts. Estimate the acceleration of such an electron due to the magnetic field of the earth. Hint: In Atlanta, the Earth's magnetic field has a magnitude of about 5.2 X 10-5 T.
  40. Physics

    6m due south,10m due east and 5m due north. Find the distance traveled and the displacement of the vector
  41. Geography

    Where on Earth: Country A is described as "shaped like an S, tropical rain forest, very populous, facing the South China Sea." -First I said Indonesia, and it was wrong.I'm pretty sure it's Vietnam Country B earns this note: "a wet land bordered by
  42. world history

    how did sapiens reach north america from africe? A they sailed from the west coast of africe to the east coast of north america. B they sailed from the southern tip of africe to south america. C they went through asia and crossed a land bridge into north
  43. physics

    copper has 8.5 x 10^28 electrons per cubic meter. (a) how many electrons are there in 30 cm length a 12 gauge copper wire (diameter 2.05 mm)? (b) if a current of 1.55 A is flowing in the wire, what is the average drift speed of the electrons along the
  44. physics

    ⦁ Find the resultant vector (magnitude and direction) for the sum of: vector A which has magnitude 365 N at 48° south of west, vector B which has magnitude 224 N at 26° south of east, and vector C which has magnitude 488 N at 12° west of north.
  45. Physics 201

    A person desires to reach a point that is 2.87 km from her present location and in a direction that is 47.5° north of east. However, she must travel along streets that are oriented either north-south or east-west. What is the minimum distance she could
  46. physics

    A boxcar of mass 3.21 x 10^4 kg is rolling south at 5.16 m/s when it collides and couples with another boxcar of mass 5.18 x 10^4 kg that is rolling north at 2.38 m/s. What is the velocity of the coupled boxcars after collision? Take north as positive and
  47. Physics

    scroll all the way to the bottom: lakeheadschools.ca/scvi_staff/brecka/Gr11_physics_web/downloadable_content/unit12/Text12/phys11_12_6.pdf How do you figure out which way the motor will spin (figure 12)? And how do you figure out which way the loop will
  48. Math

    A telephone is anchored to the ground by a long cable called a guy wire, at a point 5 meters from the base of the pole, the wire makes an angle of 72.5 degrees with the horizontal. What is the length of the guy wire? HELP ASAP! I forgot how to compute for
  49. Physics

    Shun started driving south-west for 450 meters then turned south south for 500 meter and stopped. Find Shun's displacement
  50. physics

    In the high jump, Fran's kinetic energy is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must Fran leave the ground in order to lift her center of mass 1.95 m and cross the bar with a speed of 0.70 m/s?
  51. Physics

    In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 1.75 m and cross the bar with a
  52. physics

    In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 1.65 m and cross the bar with a
  53. physics

    In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 2.00 m and cross the bar with a
  54. trigonometry

    A tent pole is 85 feet high. A cable is attached to the ground 200 feet from the tower base. How long is the cable? What is the measure of the angle the cable makes to the ground?
  55. Physics

    Train A starts at 4 miles South of a bridge and heads North at a constant speed of 30 miles per hour. Train B starts 6 miles North of the bridge. a. What velocity must Train B have so that the two trains cross the bridge at the same time? b. If Train B
  56. Science

    Which electrons in an atom take the most energy, and what are they called? What Kind of diagram is used to show how many of these electrons an atom has? What name is given to the elements with eight outer electrons? Which element belongs to this group,
  57. Social Studies

    Which key figure in Christianity does this image represent? It is a picture of Jesus tided to a cross A. Peter B. Paul C. Jesus <---- D. God I know that it is Jesus but he never died on a cross, he died on a pole.
  58. Physics

    A ship sets sail from Rotterdam, The Netherlands, heading due north at 5.00 m/s relative to the water. The local ocean current is 1.54 m/s in a direction 40° north of east. What is the velocity of the ship relative to the earth?
  59. Physics

    A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 3.90 m to the north, d2 = 2.06 m northeast, and d3 = 1.14 m at 30.0° west of south (see the figure below). Starting at the same initial
  60. physics

    A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 4.06 m to the north, d2 = 2.05 m northeast, and d3 = 1.15 m at 30.0° west of south (see the figure). Starting at the same initial point,
  61. Math (Check answers, please.)

    Hello. I am having some difficulty with this problem. Could you please check my answer? You start searching for a buried object by marking the center of a field as (0, 0), with coordinates giving distances in yards. Coordinates to the north or east are
  62. Calculus Physics

    Imagine a spaceship on its way to the moon from the earth. Find the point, as measured from the center of the earth, where the force of gravity due to the earth is balanced exactly by the gravity of the moon. This point lies on a line between the centers
  63. U.S. History

    1. Why did the call for military volunteers lead more states to secede? A: Lincoln's call for military volunteers created a crisis in the Upper South. Many people in those state did not want to secede, but they were not willing to take up arms against
  64. physics

    A boat of mass 120 kg floats in a stream. You push on the boat with a pole, exerting a force of (175 i hat - 145 j hat) N. The boat moves through a displacement dvec = (23.0 i hat - 8.0 j hat) m along a straight line.
  65. Math

    A 12 foot-high pole casts a 9 foot long shadow, at the same time of day, what would be the length of a shadow cast by a 45 foot-long tree
  66. maths

    two poles 6m and 15m tall are 20 m apart a wire is attached to the top of each pole and is also staked to the ground some where b/n two poles where should be the wire be staked so that the minimum amount of wire be used?
  67. Math 7

    how high is a tree that casts a 25 foot shadow at the same time a 6 foot pole casts a 10 foot shadow? Please help! I don't understand how to solve any problem like this!!
  68. Physics

    A metal surface is struck with light of wavelength 430 nm releasing a stream of electrons.  If the 430 nm light is replaced by 380 nm light of the same intensity, what is the result? a. no change to the emitted electrons b. emitted electrons are more
  69. Calculus AB

    A hiker walks due east for 40 minutes, then changes course by going South 25 degrees West. After 20 minutes, he changes course again, this time at South 75 degrees East. He goes through this path for one hour after which he heads north reaching his final
  70. math

    building shadow 28 m long & the shadow cast by a 64 cm tall pole is 50 cm long. what is height of building?
  71. physics

    A river flows due east at 1.91m/s.A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.3m/s due north relative to the water. A.What is the velocity of the boat relative to shore? How far downstream has
  72. english

    “Invisible Children”, a documentary filmed by three American college students Jason Russell, Bobby Bailey, and Laren Pole, set out to Africa in search “for a story”,however, they uncovered the immense suffering of a civilian population in northern
  73. HISTORY

    Where would you most likely find South America's largest cities? mountains ****** rain forests coastlines deserts 2. How did human migration most contribute to ethnic diversity in South America today? People came to South America from different parts of
  74. Physics

    The pilot of a plane measures an air velocity of 186 km/h south. An observer on the ground sees the plane pass overhead at a velocity of 102 km/h toward the north. A.) What is the velocity of the wind that is affecting the plane? Let north be
  75. Physics

    A man 1.80 m tall walks at 2.00m/s perpendicular to a horizontal magnetic field of 5.0 T; that is, he walks between the pole faces of a very big magnet. Given that his body is full of conducting fluids, estimate the potential difference induced between his
  76. Physics

    At one instant a bicyclist is 50 m due east of a park's flagpole, going due south with a speed of 18 m/s. Then, 13 s later, the cyclist is 45 m due north of the flagpole, going due east with a speed of 13 m/s. For the cyclist in this 13 s interval what is
  77. Physics

    Excess electrons are placed on a small lead sphere with mass 8grams so that its net charge is -3.20*10^9C. a) Find the number of excess electrons on the lead sphere b) How many electrons are there per lead atom
  78. math

    George drove 3 miles south and 1 mile west. Using a coordinate plane to represent his trip, let the y-axis run north and south, let the x-axis run east and west, and let his original position be the intersection of the axes. Which ordered pair best
  79. Math

    ilorin is at 8.5 degree to the north,4.6 degree to the east and free town at 8.5degree to the north,13.3degree to the west calculate(a)their distance apart,measured along the parallel of latitude(b)their distance from the equqtor(c)their speed in km/h due
  80. Physics

    Electrons in a beam incident on a crystal at an angle of 30ͦ have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5 Aͦ, and the reflected electrons are passed through a slit .Find the velocities of
  81. Physics

    Electrons in a beam incident on a crystal at an angle of 30ͦ have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5 Aͦ, and the reflected electrons are passed through a slit .Find the velocities of
  82. American History

    Which statement below summarizes President Richard Nixon’s policy of Vietnamization. A. Train the South Vietnamese so America can slowly withdraw its troops B.Order an immediate removal of Americans from Vietnam. c. Meet with the North Vietnamese and
  83. physics

    please check these 3: if the batteries in a portable CD player provide a terminal voltage of 12 V, what is the potential difference across the entire CD player? a. 3.0 V b. 4.0 V c. 6.0 V d. 12 V D two resistors having the same resistance value are wired
  84. Physical Science

    Why is metal shiny? A. The electrons absorb each light wave. B. The loose electrons reflect most wavelengths of light. C. The electrons emit light due to electronic excitation. D. The electrons transmit most wavelengths of light. (I think the answer is B,
  85. Math

    A 20-foot telephone pole casts a 4-foot shadow. what shadow length will the 6-foot man cast ? A) 1.2feet B) 2.1feet C) 2.2feet
  86. Math

    A 20-foot telephone pole casts a 4-foot shadow. what shadow length will the 6-foot man cast ? A) 1.2feet B) 2.1feet C) 2.2feet
  87. chemistry

    are the noble gases of NCCN cyanogen = Argon HCN hydrogen cyanide = Neon thanks I don't know how to answer this. There are 10 electrons, all bonding electrons in HCN. In the case of F, for example, we say its ion is isoelectronic with Ne; i.e., there are
  88. Physics

    We want to find how much charge is on the electrons in a nickel coin. Follow this method. A nickel coin has a mass of about 5.7 g. a. Find the number of atoms in a nickel coin. Each mole (6.02 × 10^23 atoms) has a mass of about 57.9 g. Answer in units of
  89. Geography

    1)The study of geography includes a)living in a dessert b)growing food c)predicting the weather d)studying people e) wearing protective clothing 2) which of the following country has no seaport a) Egypt b)Algeria c)Nigeria d)South Africa e)Uganda 3)about
  90. Physics urgent!!!!

    Electrons in a beam incident on a crystal at an angle of 30ͦ have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5 Aͦ, and the reflected electrons are passed through a slit .Find the velocities of
  91. Math

    a light shines from the top of a pole 50ft high. a ball is dropped from the same height from a point 30 ft away from the light. how fast is the ball's shadow moving along the ground 1/2 sec later? (assume the ball falls at a distance of s=16t^2 in t sec)
  92. algebra

    A wire runs from the top of a flagpole to a point on the ground that is 9 yards from the base of the pole. The wire is 15 yards long. How many yards tall is the flagpole? (Please type ONLY the numerical answer, no extra spaces or words. Do NOT include any
  93. Social Studies

    How was the South so much industrial than the North?
  94. ss

    How was the north and south different in the uncle Tom's cabin?
  95. Social Studies

    Why was the South so much less industrial than the North?
  96. physics

    A straight copper conductor is held parallel to the axis of a freely suspended magnetic needle such that the conductor is under the needle and the current is flowing from south to north. In which direction the north of magnetic needle will move?
  97. physics

    A plane starting at rest at the south end of a runway undergoes a uniform acceleration of 1.60 m/s^2 to the north. At takeoff, the plane's velocity s 72.0 m/s to the north. A. What is the time required for takeoff? B. How far does the plane travel along
  98. chemistry

    elements below, indicate how each elements’ valence electrons act in a chemical reaction. Insert an L if an element loses electrons, a G if the element gains electrons, an E if the element can either lose or gain electrons, and a U if the element is
  99. physics

    A 410-m-wide river has a uniform flow speed of 2.0 m/s through a jungle and toward the east. An explorer wishes to leave a small clearing on the south bank and cross the river in a powerboat that moves at a constant speed of 7.9 m/s with respect to the
  100. MATH

    Please help me with these problems. Work and answer is appreciated! :) thanks. 1. Find on the interval theta is greater than or equal to 0 and less than 2pi; then find the general solution: 5tantheta+1=-2.89 16cos^2theta-6=3 6sin^2theta+sintheta=2