1. Math

    There are 24 students in Mrs.Smith's 1st block class. 1/4 of the class passed the math test with an A. 12 students in the class passed the math test with a B. What percent of the students in the class passed the test?
  2. AP PHSYICS DUE LATE HOMEWORK HELP!!!

    4. Assuming that ball 1 was thrown with an initial velocity of 5 m/s, how far will it land away from the building horizontally? A. 10 M b. 16 M C. 21 M D. 0.63 M 5. A projectile is launched a t 35 m/s at an angle of 33 degrees. Determine (a) the maximum
  3. physics

    4. Assuming that ball 1 was thrown with an initial velocity of 5 m/s, how far will it land away from the building horizontally? A. 10 M b. 16 M C. 21 M D. 0.63 M 5. A projectile is launched a t 35 m/s at an angle of 33 degrees. Determine (a) the maximum
  4. MATH help

    A box with no top is to be constructed from a piece of cardboard whose Width measures x inch and whose length measures 3 inch more than the width the box is to be formed by cutting squares that measure 1 inch on each side of the 4 corners and then folding
  5. Calc

    1. Differentiae each function a) Y=-3x^2+5x-4 b) F(x) = 6/x-3/x^2 c) F(x)=(3x^2-4x)(x^3+1) 2. Determine the equation of the tangent line to the curve y=2x^2-1 at the point where x=-2 3. Evaluate, rounding to two decimal places, If necessary a) In 5 b) b)
  6. Physics (simple stuff)

    . Does the force of friction depend on the area of the sliding surface? What is larger, static friction or sliding friction when an object is stationary? Why sand is placed on icy streets and sidewalks? )something to do with friction) how could you reduce
  7. Physics

    a particle moving in the xy plane has velocity components dx/dt =2t and dy/dt = 4. If the particle starts from the origin at t = 0,magnitude of its displacement at t=2 is
  8. Physics -.-

    A projectile is shot horizontally at 220 m/s from the top of a 620 m high cliff. A) How long till the projectile hits the ground? B) How far from the base of the cliff does the projectile land? I am gonna be honest. I have no idea how to do any of my
  9. Trigonometry

    A ladder that is 15 feet long is placed so that it reaches from level ground to the top of a vertical wall that is 13 feet high A. Use the law of sines to find the angle that the ladder makes with the ground to the nearest hundredth B. Is more than one
  10. physics

    you are driving up a long, inclined road . after 1.20 mi you notice that signs along the roadside indicate that your elevation has increased by 550 ft.
  11. 10th grade

    a tree casts a shadow that is 20 feet long. the angle of elevation from the end of the shadow to the top of the tree is 66 degrees. Determine the height of the tree to the nearest foot.
  12. Physics

    A projectile of mass 1.350 kg is shot straight up with an initial speed of 22.0 m/s. (a) How high would it go if there were no air friction? (b) If the projectile rises to a maximum height of only 17.8 m, determine the magnitude of the average force due to
  13. Physics

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

    Tarzan of mass 80kg swings from rest on a rope of length 10m that is horizontal when he starts at the bottom of his swing his speed is 14m.second he picks up jane sitting on the ground in an inelastic collision jane has a mass of 50kg they then swing
  15. Science (1 question)

    Question #1: A maglev train uses powerful magnets to lift the train above the tracks as it moved forward. Such a design reduces which of the following forces? a. rolling friction b. gravity c. air resistance d. fluid friction I think the answer is "b"
  16. math

    Given the plane 2x-3y+7z=4, a) Find the equation for the line perpendicular to the plane that intersects the plane at the point P=(6,5,1). b) How far is it from the point (4,-2,3) to the plane?
  17. English

    Do you generally say: 1) We cooked food on the plane or in the plane or from the plane. (In this sentence I just want to say that we cooked our meals ourselves when we were travelling on the plane) Thank you.
  18. physics

    A 15kg wedding cake is allowed to slide freely down a smooth 30degree inclined. Find the resultant force down the inclined and the acceleration of the object.
  19. science

    a sphere of mass 500.0g is released from point A 5m above the ground and slides down to point B 3.2m through point C 2m in frictionless wire track. (1)determine the particle's speed at points B and C. (2)determine the net work done by the force of graviy
  20. Physics

    A rock is dropped from a sea cliff 400m high.If the speed of sound is a constant 330 m/s, how long after the rock is dropped is the sound of the splash heard at the top of the cliff?
  21. physics

    a car starts from rest and accelerates for 7.8s with an acceleration of 2.3 m/s squared. how far does it travel
  22. School

    How much force would you need to apply to a 1.7kg object to have it reach 5.8 m/s if it starts from rest?
  23. physics

    a go cart starts at rest and accelerates to 40 m/s in 200m what is the acceleration of the cyclist?
  24. physical

    a car a starts from rest 305kg increase its equal to 10m/s in 2 second
  25. maths

    At the local fire station they have different lengths of fire hose. the shortest is half the length of the middle-sized one, and one fifth of the length of the longest one. if i connect the three different hose lengths together i make a hose 120m long. how
  26. Physics

    1. A 38kg object is traveling down the ramp and experiences a frictional force of 180N. Calculate the angle of incline and the friction coefficient between the two surfaces. Answers: μ(mu)=0.55 Θ=28.9 degrees But please show work and all
  27. Science

    A block of ice has the density of 0.97 g/cm3. How much of it will sink below the surface of the water? (Points : 1) About 97 percent of the ice will sink below water. About 3 percent of the ice will sink below water. All—100 percent—of the ice will
  28. physics

    A car (mass = 860 kg) is at rest on the top of a tall hill. the car rolls down the hill and at the bottom, reaches a top speed of 19 m/s. A) find the force of gravity on the car 560 x 9.8 = 5488 N B) find the work done by gravity on the car W = change in
  29. Math

    Paul is standing at the bottom of a hill that is 150 meters high. He measures the angle of the elevation of the top of the hill to be 32 degrees. If the slope of the hill is constant, how far will his walk to the top of the hill be
  30. Physics

    A car traveling at a constant speed of 33 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 2.62 m/s^2. How long after the trooper starts the chase does he overtake the speeding car?
  31. Physics

    A car traveling at a constant speed of 39.6 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 2.25 m/s^2 . How long after the trooper starts the chase does he overtake the speeding
  32. Physics

    A car traveling at a constant speed of 33 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 2.62 m/s^2. How long after the trooper starts the chase does he overtake the speeding car?
  33. math 5th

    Jenna had 24.5 yards of lace. She cut it into pieces of equal length between 2 and 4 yards long. The pieces are multiples of 0.5 yard in length. How long is each piece? How many pieces does she have? Thank you,have a nice weekend.
  34. physics

    A 10kg box is attached to a 7kg box which rests on a 30 degrees incline the coeficient of kinetic friction is mk=0.1 between the box and surface find the rate of acceleration of the system
  35. physics

    A textbook is 23cm long, 18cm wide and 4cm deep and its mass is 1.8 kg. Find the work required to accelerate it from rest to an angular speed of 2.75 rad/s spinning about the: -length axis -width axis -depth axis
  36. Physics

    You and your friend are practicing pass plays with a football. You throw the football at a 35.0° angle above the horizontal at 19.0 m/s. Your friend starts right next to you, and he moves down the field directly away from you at 5.50 m/s. How long after
  37. physics

    calculate the amount of heat energy required to raise the temperature of a 5kg block of solid platinum from 0 degrees celsius to 25 degrees celsius. the specific heat of platinum is 133j/kg k. how much heat energy is required to raise 5kg of water by the
  38. Biophysics

    a person is standing with there feet 0.1m apart and length from shoulders to feet(pivot point) is 1.5m what is the minimal coefficient of static friction required so that the frictional force is at least 1.5 x as large as the external force toppling the
  39. Geometry

    Ok, this is going to be confusing to write, but I'll do my best... <=angle T=perpendicular to (when upside down) (Write proof in two-column form) Given: <JMK=<LMK; segment MK T plane P Prove: segment JK = segment LK There is a plane (P) and there
  40. PHYSICS math

    2. An airplane is 50,000 m above an observer and 2.1 km to the west of them and 1.5 km to the north of you. Determine the angle to the plane in the x – y axis and the total distance to the plane from you. Choose the x-axis east, y axis north, and z axis
  41. physics

    A 1.00 kg hollow ball with a radius of 2.2^10^-1 m, filled with air, is released from rest at the bottom of a 1.50 m deep pool of water. How high above the water does the ball shoot upward if the upward force exerted by the fluid on the ball 40 N? Neglect
  42. physics

    a 1200 kg car going 30 m/s applies its brakes and skids to rest. if the friction force between the sliding ires and the pavement is 6000 N, how far does the car skid before coming to rest. I know the ans is 90 m what work/energy formula should i use to get
  43. Science

    A box that is initially at rest is pushed by a person at an angle 0 with a force F until it reaches a speed of v. The coefficient of kinetic friction between the box and the surface is U. Is this: work done by person equal to magnitude of friction F work
  44. Physics(friction)

    Find the coefficient of friction between a 73kg cubic box measuring 3m and a hardwood floor 16m long and 20m wide if a total of 236N is required to start the box moving.
  45. Dynamics

    A ball is launched up an inclined wall by a spring. The spring has a spring constant of 12.2 kN/m and is initially compressed 0.3m. The ball has a mass of 1.7 kg, a radius of 0.045m, and a moment of inertia of 0.0014kg*m^2. You can assume the ball rolls
  46. Physics

    A ball is launched up an inclined wall by a spring. The spring has a spring constant of 12.2 kN/m and is initially compressed 0.3m. The ball has a mass of 1.7 kg, a radius of 0.045m, and a moment of inertia of 0.0014kg*m^2. You can assume the ball rolls
  47. Math

    Perry draws two planes, K and L, as shown. Which statement is true? Plane K and plane L contain four lines because a theorem states that a line extends on both sides of a plane. Plane K and plane L intersect along a line because a postulate states that if
  48. Automotive engine parts and operation

    plz help me w/ the answers i have n tell me if i'm wrong. 1. An automotive engine's camshaft rotates at A. the same speed as the crankshaft B. one-quarter the speed of the crankshaft C. one-half the speed of the crankshaft D. twice the speed of the
  49. Physics

    Physics Homework _____________________________________________________________ 1.) A particle at t 1 = -2.0 s is at x 1 = 3.4 cm and at t 2 = 4.5 s is at x2 = 8.5 cm. What is its average velocity? Can you calculate its average speed from this data?
  50. math

    margarit liked to balance things. she balanced 3 pencil sharpeners and 2 one gram blocks with a 100 gram weight and another one gram block. she let x stand for the weight of one pencil sharpener and she claimed that x=30grams. was she correct if not how
  51. phusics

    A car can slow down at 5.10 m/s2 without skidding when coming to rest on a level road. What would its acceleration be if the road were inclined at 12o uphill?
  52. physic

    Starting from rest, a car accelerates at 2.5 m/s^2 up a hill that is inclined 5.4 ^\circ above the horizontal. how far the car travel horizontally in 15s?
  53. trigonometry

    From the roof of the building 25 meters high, the angle of elevation of the top of the pole is 21°11’ , from the bottom of the building, the angle of elevation is 43°2’, determine the height of the pole .
  54. trigonometry

    From the roof of the building 25 meters high, the angle of elevation of the top of the pole is 21°11’ , from the bottom of the building, the angle of elevation is 43°2’, determine the height of the pole .
  55. Probability

    A single dot is placed on a very long length of yarn at the textile mill. The yarn is then cut into pieces. The lengths of the different pieces are independent, and the length of each piece is distributed according to the same PDF fX(x). Let R be the
  56. physics

    1. what happens to the force required for an object to maintain circular motion if the period is halved (goes twice as fast around the circle)? a) force doubles b) force quadruples c) force is halved d) force is quartered 2. In a pulley problem involving
  57. Physics

    An airplane is 5,000 m above an observer and 2.1 km to the west of them and 1.5 km to the north of you. Determine the angle to the plane in the x – y axis and the total distance to the plane from you. Choose the x-axis east, y axis north, and z axis up.
  58. physics

    An airplane is 50,000 m above an observer and 2.1 km to the west of them and 1.5 km to the north of you. Determine the angle to the plane in the x – y axis and the total distance to the plane from you. Choose the x-axis east, y axis north, and z axis up.
  59. physics

    An airplane is 5,000 m above an observer and 2.1 km to the west of them and 1.5 km to the north of you. Determine the angle to the plane in the x – y axis and the total distance to the plane from you. Choose the x-axis east, y axis north, and z axis up.
  60. Science...Please help

    What is friction? Can you give me some examples? -THANK YOU FOR ALL YOUR HELP! friction: Ever have a pinwheel and move it through the wind? Friction makes the wheel turn. Ever on a bike an press the brake? Friction makes the wheel stop. Friction is the
  61. Physics

    A skier swoops down a hill and over a ramp. She starts from rest at a height of 18m, leaves the ramp at an angle of 45 degrees, and just clears the snowman on her way down, making an angle of 30 degrees with the vertical as she does. Assuming that there is
  62. Math (Combinatorics)

    In the plane, the points with integer coordinates are called lattice points. Suppose a flea in the plane jumps from one lattice point to another. Each jump is one unit to the right, one unit to the left, one unit up, or one unit down. If the flea starts at
  63. Math (Combinatorics)

    In the plane, the points with integer coordinates are called lattice points. Suppose a flea in the plane jumps from one lattice point to another. Each jump is one unit to the right, one unit to the left, one unit up, or one unit down. If the flea starts at
  64. physics

    If α = 40°, β = 60°, and M = 4.0 kg, determine the tension in string 1 & 2. -------/ / 1 /2 / . . . Blockmass Alpha is on the top left angle and Beta is on the top right angle.
  65. physics

    A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 270 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +2.9 m/s relative to the shore, and then hops onto an identical
  66. MATH

    Debbie has two pieces of rope one 20ft.long the other 14ft. Long for a project,she needs to cut them up to produce many pieces of rope that are all of the same length with no rope left over.what is the greatest length in ft. That she can make?
  67. MATH

    A radio tower 500 feet high is located on the side of a hill with an inclination to the horizontal of 5 degrees. How long should two guy wires be if they are to connect to the top of the tower and be secured at two points 100 feet directly above and
  68. Physics

    The equation of a transverse wave traveling along a very long string is given by y = 5.2 sin(0.013π|x + 4.7π|t), where x and y are expressed in centimeters and t is in seconds. (a) Determine the amplitude. (b) Determine the wavelength. (c)
  69. physics

    a 2.0 kg crate is incline at 60degrees and is held in equilibrium by a horizontal force.. what is the magnitude of this horizontal force? (disregard friction)
  70. Physics

    A mass of 5Kg is 1st weighed on a balance at the top of a tower 20m high.The man is then suspended from a fine wire 20m long and reweivhed.find the difference in a weight ,assuming that the radius of the earth is 6400km,the mass of the earth is 6×10^24kg
  71. Physics

    A bead slides without friction around a loopthe-loop. The bead is released from a height of 18.9 m from the bottom of the looptheloop which has a radius 7 m. The acceleration of gravity is 9.8 m/s^2. What is its speed at point A ? Answer in units of m/s.
  72. physics

    An Olympic skier moving at 20.0 m/s down a 30.0 degree slope encounters a region of wet snow and slides 145 m before coming to a halt. What is the coefficient of friction between the skis and the snow?
  73. Physics

    An Olympic skier moving at 19 m/s down a 26 degree slope encounters a region of wet snow and slides 136 m before coming to a halt. What is the coefficient of friction between the skis and the snow? ( g = 9.81 m/s2)
  74. Physics

    A box is given a quick push so that it slides along a horizontal floor. a) What is its acceleration if the coefficient of kinetic friction is 0.30? b) How far will it travel if its initial speed was 3.0m/s? Is it possible to find the acceleration when only
  75. physic

    A grinding wheel of radius 0.280 m rotating on a frictionless axle is brought to rest by applying a constant friction force tangential to its rim. The constant torque produced by this force is 75.3 N · m. Find the magnitude of the friction force.
  76. physics

    A grinding wheel of radius 0.370 m rotating on a frictionless axle is brought to rest by applying a constant friction force tangential to its rim. The constant torque produced by this force is 79.2 N • m. Find the magnitude of the friction force.
  77. Math - Trigonomety

    A plane is flying at a height of 1000 feet. A passenger on the plane sees a tree and realizes the angle of depression to the top of the tree is 15 degrees and the angle of depression to the bottom of the tree is 25 degrees. How tall is the tree?
  78. Algebra

    A quilt is 100 m. long and 1 meter wide It has to folded to 1 meter for it to fit inside the cubby. How can experimental function be used to describe the lengths??? Also, How could you use y=2^x to determine the # of folds for the length of 128 ?
  79. Physics

    A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
  80. Physics

    A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
  81. Physics

    A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
  82. Physics

    A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
  83. physics

    A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
  84. Physics

    A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
  85. Physics

    A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
  86. computer science / app development?

    If anyone here is familiar with AppInventor.... 0 down vote favorite I have a database of events in AppInventor containing information such as location, description, and tags. I want to include a search by location screen of an app where the user clicks
  87. AP Physics C

    as she pick up her riders a bus driver traverses four successive displacements represented by the expression (-6.30 b)i-(4.00 b cos 40)i-(4.00 sin 40)j+(3.00 b cos 50)i-(3.00 b sin 50)j-(5.00 b)j here b represents one city block,a convenient unit of
  88. maths

    solution to the question+from the starting point A, a person goes 10m east then 10m north reaching the foot of a vertical pole 5m high, on top of which a red light is fitted. what is the actual distance of the red light as observed from A?
  89. vector mechanics- dynamics

    The slender bar AB weights 8 kg and moves in the xy plane, with its ends constrained to follow the smooth horizontal and vertical guides as shown in Figure Qi. By assuming the bar AB is initially at rest; a) Calculate the angular acceleration of the bar.
  90. Physics

    Air resistance acting on a falling body can be taken into account by the approximate relation for the acceleration. a= dv/dt= g-kv, where k is a constant. A) Derive a formula for the velocity of the body as a function of time assuming it starts from rest
  91. Physics

    A 3.5 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 16.9◦ with the horizontal. An average frictional force of 4.1×103 N impedes the car’s motion so that the car’s speed at the bottom of the driveway
  92. Physics

    A 3.5 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 16.9◦ with the horizontal. An average frictional force of 4.1×103 N impedes the car’s motion so that the car’s speed at the bottom of the driveway
  93. Physics

    A 3.5 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 16.9◦ with the horizontal. An average frictional force of 4.1×103 N impedes the car’s motion so that the car’s speed at the bottom of the driveway
  94. Statics

    A 5m long uniform ladder weighing 150N is resting on the floor and wall at point A and B respectively. The coefficient of static friction of the floor and the wall are 0.2 and 0.3 respectively. Determine how far a 500N Electrician can climb before the
  95. math 2 questions plz help asap

    1) Mr. customs is correcting the class's math homework on customary units. which of the following measurements is reasonable? A. a pencil is 12 feet long B. the back porch is 12 inches wide C. the 3rd hole on the golf court is 123 miles long D. the
  96. Biology

    I hope you can help me with this question: "Imagine that you go to a party with a friend who starts drinking alchohol.Describe , step by step , the effects to that individual as he drinks more and more alchohol as the evening progresses and the long term
  97. Physics

    A scuba diver must decompress after a deep dive to allow excess nitrogen to exit safely from his bloodstream. The length of time required for decompression depends on the total change in pressure that the diver experienced. Find this total change in
  98. Physics

    A cup of coffee is sitting on a table in an airplane that is flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.37. Suddenly, the plane accelerates, its altitude remaining constant.
  99. physics

    A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.18. Suddenly, the plane accelerates forward, its altitude remaining constant. What is
  100. Physics

    A 50-Newton box lays on a plane inclined 20degrees from the ground. Though the weight of the box is directed downwards, we know that some component of it is responsible why the box would slide. Find the value of this component