1. PHYSICS

    In December of 1989, a KLM Boeing 747 airplane carrying 231 passengers entered a cloud of ejecta from an Alaskan volcanic eruption. All four engines went out, and the plane fell from 27800 ft to 13700 ft before the engines could be restarted. It then
  2. Physics

    In December of 1989, a KLM Boeing 747 airplane carrying 231 passengers entered a cloud of ejecta from an Alaskan volcanic eruption. All four engines went out, and the plane fell from 27800 ft to 13700 ft before the engines could be restarted. It then
  3. physics

    A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc
  4. physics

    A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc
  5. physics

    In Example 5.8, we investigated the apparent weight of a fish in an elevator. Now consider a 72.0 kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 0.80 s. It travels with
  6. physics

    1.what is the final velocity of a hoop that rolls with out slipping down a 3.00m high hill starting at rest? 2. a 1.80 m radius playground merry go round (disk = 1/2 m r^2) hass a mass of 120 kg and is rotating with an angular velocity of .600 rev/s. what
  7. Physics

    Pete slides a crate up a ramp at an angle of 20 degrees by exerting a 244 N force parallel to the ramp. The crate moves at a constant speed. The coefficient of friction is 0.19. How much work did Pete do when the crate was raised a vertical distance of
  8. physics

    Pete slides a crate up a ramp at an angle of 25◦ by exerting a 290 N force parallel to the ramp. The crate moves at a constant speed. The coefficient of friction is 0.28. How much work did Pete do when the crate was raised a vertical distance of 2.24
  9. school of engineering

    A train of mass 200 tonne travelling at 140 km/h applies the brakes fiercely , so that the brakes lock and the wheels slides along the rails.it stops sliding 1000m. calculate. 1. The acceleration. 2. The longitudinal force on the rail. 3. The coefficient
  10. school of engineering

    A train of mass 200 tonne travelling at 140 km/h applies the brakes fiercely , so that the brakes lock and the wheels slides along the rails.it stops sliding 1000m. calculate. 1. The acceleration. 2. The longitudinal force on the rail. 3. The coefficient
  11. Physics

    Two parallel, uniformly charged, infinitely long wires carry opposite charges with a linear charge density ? = 5 £gC/m and are 8 cm apart. What is the magnitude and direction of the electric field at a point midway between them and 49 cm above the plane
  12. math

    An ant starts at position (0, 0) and walks north, east, south or west, one unit at a time. How many di erent paths of length 8 units finish at (0, 0)?
  13. spelling

    long vowel what about long vowels? A long vowel says its name. Example. long a - fA vor, pAy, long e - lE ver sEep long i - bIke, rIght long o - Open, clOse long u - flU , slUe
  14. HCC

    A motorcycle is following a car that is traveling at constant speed on a straight highway. Initially, the car and the motorcycle are both traveling at the same speed of 19.5 m/s , and the distance between them is 57.0 m . After t1 = 4.00 s , the motorcycle
  15. Maths

    A long wire of some length is cut into small pieces of 216cm leave a small piece of length of 89 cm if this part were cut into equal pieces each of 18cm the length of the leftover wire would be
  16. math

    so if a trapezoid has 4 sides and the top(short) side and the two not parallel sides are all 5 inches long, what are possible lengths for the long (bottom) side? and are there more than 1 possible solution?
  17. reading

    WHAT WAS THE AMERICAN SMALL TOWN LIKE? I'm glad I was born soon enough to have seen the American small town, if not at its height, at least in the early days of decline into its present forlorn status as a conduit for cars and people, all headed for some
  18. Chemisrty

    Identify the type of question. Is it a literature research question, observation only question, demonstration question, or investigation question? How would you determine the PH of vinegar using cabbage juice as an indicator? (investigation) Do germaniting
  19. Physics

    The New England Merchants Bank Building in Boston is 152 high. On windy days it sways with a frequency of 0.12 , and the acceleration of the top of the building can reach 2.5 of the free-fall acceleration, enough to cause discomfort for occupants. What is
  20. Physics

    The New England Merchants Bank Building in Boston is 152 high. On windy days it sways with a frequency of 0.12 , and the acceleration of the top of the building can reach 2.5 of the free-fall acceleration, enough to cause discomfort for occupants. What is
  21. English

    I left out the following three points. Thank you very much. 1) he is wearing a nice lilac button-up coat over a long-sleeved black patterned shirt and a pair of elegant, black trousers. 2) She is holding a black hand bag in her right hand. She has black
  22. phy

    Review. An object with a mass of m 5 5.10 kg is attached to the free end of a light string wrapped around a reel of radius R 5 0.250 m and mass M 5 3.00 kg. The reel is a solid disk, free to rotate in a vertical plane about the horizontal axis passing
  23. Math

    A 73​-ton monolith is transported on a causeway that is 2500 feet long and has a slope of about 2.2°. How much force parallel to the incline would be required to hold the monolith on this​ causeway?
  24. AYUDA

    a bungee jumper whit mass 65. kg jumps from a high bridge. after reaching his lowest point. he oscillates ud a down, hitting a low point eight more times in 38.0 s. he finally comes to rest 25.0 m below the level of the bridge. calculate the spring
  25. College Physics

    The ball launcher in a pinball machine has a spring that has a force constant of 1.50 N/cm. The surface on which the ball moves is inclined a = 14.5o with respect to the horizontal. If the spring is initially compressed 4.70 cm, find the launching speed of
  26. Literaure Question-Desperate For Help!

    It is not wise to rely on the ________ to determine whether a stereotype exists in a book. title, illustrations, book's format, or copy-right date I do not know how to answer this question. My text says do not rely on the date of publication to tell you if
  27. mathematics

    The circle x2-2x+y2-4y-4=0 lies on the cartesian plane,question 2.1.1 equation of new circle which is the rotation of original circle through 180 degree around the origin...2.1.2 find equation of another circle which is the translation (x;y)-(x-8;y-6) of
  28. One Trigonometry Question Please Help!

    Quilt squares are cut on the diagonal to form triangular quilt pieces. The hypotenuse of the resulting triangles is 18 inches long. What is the side length of each piece? 9 inches 9ã3 inches 18ã2 inches 9ã2 inches Thank You I Really Appeciate it!
  29. science equation

    I don't think I have enough information to answer this question but my teacher says i do. The question is, If I drop a ball off of the AUL building and it take 8 seconds to hit the ground what is the velocity of the ball? I know that v=d/t so I have v=d/8
  30. Physics

    A beam of mass mb = 10.0 kg, is suspended from the ceiling by a single rope. It has a mass of m2 = 40.0 kg attached at one end and an unknown mass m1 attached at the other. The beam has a length of L = 3 m, it is in static equilibrium, and it is
  31. physics

    When a water gun is fired while being held horizontally at a height of 1.14 m above ground level, the water travels a horizontal distance of 4.50 m. A child, holding the same gun in a horizontal position, slides down a 34.0◦ incline at a con-
  32. Science

    A lorry has a mass of 5640kg and accelerates uniformly from rest to reach a velocity of 100km/h in 10s. Determine the acceleration of the lorry. Determine the force needed to accelerate the lorry
  33. Trig

    A 60-foot flagpole stands on top of a building. From a point on the ground the angle of elevation to the top of the pole is 45 degrees and the angle of elevation to the bottom of the pole is 42 degrees. How high is the building?
  34. math

    The length of a rectangle is 5 in. more than twice its width.? How do I find the width of the rectangle. The length = (2 x width) + 5 inches. Do you have any other information about the rectangle such as the area or the perimeter. I don't think there is
  35. Calculus - not sure if my work is correct?

    A 15ft ladder leans against a building and its base starts to slide down the wall. The base is moving at a rate of 5ft/sec when the base is 9ft from the wall. How fast is the top of the ladder moving at this moment? What is the rate of change of the angle
  36. Maths

    A drinking straw of length 21cm is cut into 3 pieces the length of the first piece is x cm the second piece is 3 cm shorter than the first piece the third is twice as long as the first piece state term of x to represent the sum of of the length {2} write
  37. pre calc

    Suppose you get on a Ferris Wheel that has a diameter of 40 meters and turns at a rate 1.5 revolutions per minute (the period is not 1.5 ) the height above the ground in meters, of your seat after t minutes can be modeled by an equation. Assume you get on
  38. Statistics

    In the July 29, 2001, issue of The Journal News (Hamilton, Ohio) Lynn Elber of the Associated Press reported on a study conducted by the Kaiser Family Foundation regarding parents’ use of television set V-chips for controlling their children’s TV
  39. Physics

    A ladder, 5.0 m long, leans against a frictionless wall at a point 4.0 m above the ground. A painter is climbing up the ladder. The mass of the ladder is 12.0 kg and the mass of the painter is 60.0 kg. The ladder begins to slip at its base when the painter
  40. please help asap!

    A ladder, 5.0 m long, leans against a frictionless wall at a point 4.0 m above the ground. A painter is climbing up the ladder. The mass of the ladder is 12.0 kg and the mass of the painter is 60.0 kg. The ladder begins to slip at its base when the painter
  41. Physics

    Joan comes across a deep ravine. She was planning on this as she packed a 3.8 m portable telescoping extension ladder. It has a mass of 15 kg. She was told that in order to get to the skull’s last known location, she must get across this 2 m gap. --- |
  42. Physics

    (I'll try to describe this the best I can, it's a little hard without showing a picture) This question deals with projectile motion: An archer is standing 150 meters above another archer 450 meters away [so visually the 150m and 450m make the right angle].
  43. Mathh

    A rectangular flower bed is to be created so that the length is 3 m more than the width. If the length of the diagonal of the flower bed is 15 m, determine the length and the width.
  44. College Mathematics

    This is a repost. I posted a question 2 days ago and the response was wrong. The question was on Probability. The question was One card is selected from a deck of playing cards. Determine the probability of selecting a jack OR a club. use this rule P(A or
  45. maths

    A ladder lies against a wall.the top of the ladder reaches 8feet above the ground. when the ladder slips 2meters away from the wall,the top of the ladder touches the foot of the wall.then length of the wall?
  46. math

    A pair of skydivers jump out airplane 5.5km above the ground. The equation H=5500-5t^2 is an appropriate model for the divers' altitude in metres at tseconds after jumping out of the plane. A. After 10secs how far have the divers fallen? B. They open their
  47. physics

    A force is given by Fx=Ax^-3, where A=8.0 N*m^3.(a) For positive values of x,does the potential energy associated with this force increase or decrease with increasing x?(You can determine the answer to this question by imagining what happens to a particle
  48. maths

    Determine the length and breadth of a rectangle if the length is 3cm less than twice the breadth, and the perimeter is 18 .
  49. maths

    Determine the length and breadth of a rectangle if the length is 3cm less than twice the breadth, and the perimeter is 18 .
  50. Physics

    Two packing crates of masses m1 = 10.0 kg and m2 = 3.50 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 3.50 kg crate lies on a smooth incline of angle 37.0°. Find the acceleration of the 3.50 kg crate. up
  51. Physics

    Two packing crates of masses m1 = 10.0 kg and m2 = 6.50 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 6.50 kg crate lies on a smooth incline of angle 39.0°. a)Find the acceleration of the 6.50 kg crate.
  52. physics

    A light bulb is placed 16.6 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 5.40 cm closer to the mirror. Calculate the focal length of the concave mirror. i know that for
  53. physical science

    if a ball is thrown straight up at a speed of 34.7m/s how long in seconds will it continue to rise before it starts to fall back down?
  54. Physical science

    If a ball is thrown straight up at a speed of 24.7 m/s, for how long of a time will it continue to rise before it starts to fall back down?
  55. physical science

    If a ball is thrown straight up at a speed of 27.8 m/s, how long (in seconds) will it continue to rise before it starts to fall back down
  56. physics

    A 22 kg box rests on the back of a truck. The coefficient of static friction between the box and the truck bed is 0.369. The acceleration of gravity is 9.81 m/s2 . What maximum acceleration can the truck have before the box slides backward
  57. Physics

    A popular amusement park ride looks like a huge cylinder of radius 3 m, where people stand up along the vertical walls on top of a floor which can drop away. The cylinder begins to rotate faster and faster, and when it reaches its highest speed the floor
  58. Physics

    A string has a mass per unit length of 7.00x10-3 kg/m and a length of 0.230 m. What must be the tension in the string if its second harmonic has the same frequency as the second resonance mode of a 2.05 m long pipe open at one end?
  59. Math

    How long can I wait to see the answer of my question about Algebra ? Its been a long hour .
  60. physics

    If a rod is moving at a velocity equal to 1/2 the speed of light parallel to its length, what will a stationary observer observe about its length? The length of the rod will become exactly half of its original value. The length of the rod remains the same.
  61. math,algebra

    Can someone help me just to do the setup of this the two equations. I can do the rest is just the step up THAT I AM HAVING DIFFICULTY. The length of a rectangle is 2in. more than twice its width. If the perimeter of the rectangle is 52in. wHAT IS THE
  62. Math

    . A playground has a total of 18 swings and slides. There are as many swings as there are slides. How many are there of each?
  63. Mechanics M1

    A child is splaying with a toy aero plane. the aero plane is flying with velocity (6i + 2j)m/s. A breeze begin to blow with velocity 0.5j m/s affecting the motion of the aero plane. a) find the magnitude of the resultant velocity of the plane b) find the
  64. physics

    A special prototype model aeroplane of mass 400g has a control wire 8cm long attached to its body. The other end of the control line is attached to a fixed point. When the aeroplane flies with its wings horizontal in a horizontal circle, making one
  65. physics

    A special prototype model aeroplane of mass 400g has a control wire 8cm long attached to its body. The other end of the control line is attached to a fixed point. When the aeroplane flies with its wings horizontal in a horizontal circle, making one
  66. calculus

    an airplane flying due east at 400 km/h pasess over an airport 12 minutes before a second plane flying south 30 degrees west at 500 km/h.if the airplanes are at the same altitude how fast will they by seprating when the seccong pane is over the
  67. Physics

    Marcus and Santa are sliding down a snowy hill that is 13.3 m high. On the hill itself friction and air resistance can be ignored. At the bottom of hill the sled hits a long patch of rough snow that slows the sled down by exerting an average force of 170
  68. Physics

    A centrifuge rotor rotating at 10700 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 2.48 m * N. 1. If the mass of the rotor is 5.61 kg and it can be approximated as a solid cylinder of radius 0.0820 m, through how
  69. physics

    An object glides on a horizontal tabletop with a coefficient of kinetic friction of 0.65. If it comes to rest after 0.9 seconds, what was its initial velocity?
  70. Science

    a body rolled on a surface with speed of 10m/s comes to rest after covering distance of 50 m find cofficient of friction
  71. Physics

    Solar heating takes advantage of solar collectors such as the type shown in the figure . During daylight hours, the average intensity of solar radiation at the top of the atmosphere is about 1400 W/m^2. About 50% of this radiation reaches the Earth during
  72. Geometry- trig ratio

    An observer (o) spots a plane flying at a 55 degrees angle to his horizontal line of sight. if the plane is flying at an altitude of 21,000 ft, what is the distance (x) from the plane (p) to the observer (o)?
  73. Physics

    A puck of mass m = 1.10 kg slides in a circle of radius r = 24.0 cm on a frictionless table while attached to a hanging cylinder of mass M = 3.00 kg by a cord through a hole in the table. What speed (in m/s) keeps the cylinder at rest?
  74. physics

    A puck of mass m = 1.90 kg slides in a circle of radius r = 16.0 cm on a frictionless table while attached to a hanging cylinder of mass M = 3.70 kg by a cord through a hole in the table. What speed keeps the cylinder at rest?
  75. Physics

    "An object is rolled up an incline. If the object is 2.75 m up the incline after 4.50s and rolling back down at a velocity of 1.90 m/s, what is the acceleration of the object?" Is this a case of final velocity - initial velocity?? It seems like an easy
  76. Physics

    My physics optional extra work: This would be helpful so I can compare the solutions here as I do the work by myself. Question: A car enters a circular flat curve with a radius of curvature of 0.20 km with a maximum speed of 135 km/h. If the friction
  77. Chemistry

    How many joules are required to raise the temperature of 450mL of water from 30 °C to 100 °C? The specific heat of copper metal is 0.385 J/ g- K. How many KJ of heat needed to raise the temperature of 1.1 kg block of copper from 27.5 C to 50 C? If 200 J
  78. US Department of Labor

    I asked this question eariler and told it needed to be rephrased...this is how my teacher asked it: Find the top ten violations that most United States industries are guilty of conducting. Pick a couple of other foreign countries and try to determine what
  79. Physicsy

    a ball thrown 45m high speed of 10m/s at what time reach the top?
  80. Math

    What is the potential energy in a body of mass 5kg on top of a pole 20metres high ?
  81. physics

    PLEASE HELP !!!!!!Find the acceleration reached by each of the two objects shown in figure below if the coefficient of kinetic friction between the 7.00 kg object and the plane is 0.250. img411.imageshack.us/img411/5841/p449.gif I keep getting 3.9=a
  82. physics

    A large plane having uniform charge density has an electric field just outside the plane that points directly toward the plane with magnitude 1.25×104N/C . What is the surface charge density? Express your answer with the appropriate units.
  83. general physics

    An automobile has a mass of 1520 kg and a velocity of 19.7 m/s. It makes a rear-end collision with a stationary car whose mass is 2230 kg. The cars lock bumpers and skid off together with the wheels locked. (a) What is the velocity of the two cars just
  84. general physics

    An automobile has a mass of 1520 kg and a velocity of 19.7 m/s. It makes a rear-end collision with a stationary car whose mass is 2230 kg. The cars lock bumpers and skid off together with the wheels locked. (a) What is the velocity of the two cars just
  85. Math:Calculus

    Determine vector and parametric equations for the plane containing the point P0(1, -2, 3) and having direction vectors a= (4, -2, 5) and b = (-3, 3, 7). Thanks for the help.
  86. phys

    a plane travels at 400 mi/r to a city away. Determine the time it takes for the round trip
  87. geometry

    plot the given points in a coordinate plane.then determine whether the line segments named are congruent. A(2,2),B(2,-1),C(0,-2),D(3,-2); _ and _ AB CD
  88. Engineering science

    A lorry has a mass of 5640kg and accelerates uniformly from rest to reach a velocity of 100km/h in 10s. Determine the acceleration of the lorry. Determine the force needed to accelerate the lorry
  89. math

    The distance an automobile can travel in h hours at an average rate of 50 miles an hour is found y the formula d=50h. Problem: A car was driven for 3 hours. The driver then stopped 3/4 of an hour for lunch. After lunch he drove for 2 and 1/2 hours, then
  90. math

    The distance an automobile can travel in h hours at an average rate of 50 miles an hour is found y the formula d=50h. Problem: A car was driven for 3 hours. The driver then stopped 3/4 of an hour for lunch. After lunch he drove for 2 and 1/2 hours, then
  91. physics

    A glass is slid across a table top, goes of the edge and falls to the floor below. The table is 0.860 m high and the glass lands 1.77 m from the edge. (a) With what velocity (m/s) did the glass leave the table top? (b) What was the direction of the glass's
  92. Physics (repost)

    (I'll try to describe this the best I can, it's a little hard without showing a picture) This question deals with projectile motion: An archer is standing 150 meters above another archer 450 meters away [so visually the 150m and 450m make the right angle].
  93. physics

    As a civil engineering intern during one of your summer in college, you are asked to design a curved section of roadway that meets the following conditions: when ice is on the road, and the ceefficient of static friction between the road and rubber is
  94. Physics

    A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.20x10^4 rad/s to an angular speed of 3.14x10^4 rad/s. In the process, the bit turns through 1.92x10^4 rad. Assuming a constant angular acceleration, how long would it
  95. help i have no idea!!!!!!

    3.Sam is a mailman who delivers mail in a mail truck. His route is 2 kilometers long. He usually starts his route at 8:00 am and finishes by 12:00pm If Sam decided to get a bigger route that is 12 kilometers long, what does his average speed need to be to
  96. Physics

    A small plane is 150 km south of the equator. The plane is flying at 150 km/h at a heading of 30∘ to the west of north. how many minutes will the plane cross the equator?
  97. Calc 3

    Find the volume of the wedge-shaped region contained in the cylinder x^2 + y^2 = 1 and bounded above by the plane z = x and below by the xy-plane. The picture is a cylinder with a diagonal plane through it creating a wedge. Thanks! ;)
  98. Trigonometry

    An observer (0) spots a plane flying at a 55 degree angle to his horizontal line of sight.If the plane is flying at an altitude of 21,000 ft., what is the distance (x) from the plane (P) to the observer (0)
  99. Calculus

    Can someone show how to solve this problem Two vertical towers of heights 60 ft and 80 ft stand on level ground, with their bases 100 ft apart. A cable that is stretched from the top of one pole to some point on the ground between the poles, and then to
  100. physics

    If a plane is diving straight towards the ground at 500 m/s how high up must he pull out of the dive to avoid hitting the ground.