1. PHY

    The kilogram snowboarder stands at the top of a slope that rises 27.14 meters above the valley floor. After sliding down the slope, (s)he glides up a 6 meter long jump that rises 3 meters above the valley floor. Calculate the snowboarder's speed at the top
  2. physics-ASAP

    a crate on a frictionaless plank inclined at angle theta with respect to the horizontal. Which of the follwing relationships is true? (assume that the x-axis is parallel to the surface of the incline) a)Fy = Fg b)Fx=0 c)Fy=Fx d)none of the above *my answer
  3. SCIENCE 1 QUESTION PLS HELP!!!!!

    3. Which of the following describes the relationship between friction and inertia? (1 point) When there is more friction, there is less inertia. When there is less friction, there is more inertia. When there is more friction, there is more inertia. When
  4. physics

    A 500 kg dragster reaches a speed of 100 m/s on level ground, starting from rest. Its efficiency is only 8.00% in producing kinetic energy, because of friction and its design for high power without regard to efficiency. (a) How many gallons of fuel does it
  5. physics

    2 cars are in a race the first car is 200m ahead of the second car.the first car is moving with a uniform velocity of 30m/s while the second car starts from rest and accelerate to a rate of 4m/s how far and how long will it take the second car to meet the
  6. Statistics

    A 10 question test is all multiple choice. Each question has four choices. Determine the mean number of questions answered correctly as well as the standard deviation for the number of correct answers if someone were to guess on all ten questions. So far,
  7. Physics

    A 1.00-kg beaker containing 2.0 kg of oil (density = 916 kg/m3) rests on a scale. A 2.00-kg block of iron is suspended from a spring scale and is completely submerged in the oil. Find the equilibrium readings of both scales. I was able to find the
  8. physics, please help me, this question is hard

    John Stands at the edge of a flat roof of a three story building and throws a 180g ball straight up into the air that reaches a height of 3.0 meters above the roof. ( building is 14 meters high) A. What is the initial speed of the ball? B. How long does it
  9. physics

    Ricky, the 5.8 kg snowboarding raccoon, is on his snowboard atop a frictionless ice-covered quarter-pipe with radius 9 meters. If he starts from rest at the top of the quarter-pipe, what is his speed at the bottom of the quarter-pipe? Use SI units in your
  10. physics

    really confused, A 2kg box is sliding east at 50m/s on a frictionless floor when it collides with a 4kg box sliding east at 10m/s. After the collision, the 2 kg box is sliding east at 20m/s and the 4kg block is sliding east at 25m/s. Calculate the
  11. Physics

    If a .3kg arrow is fired at 120m/s at a 30degree angle with the horizontal, how high is it at the top of its arc? I'm confused. Do I break up the x and y components of velocity or do I set initial KE + PE = KE (top of arc)+ PE (top of arc) to get
  12. physics

    Solid A of mass 50 kg resting on a smooth 45º incline is maintained in equilibrium by means of the light string passing over the pulley and holding at its other end a solid B of mass m. Make the inventory of the forces acting on A. Determine graphically
  13. physics

    (a) if a train travelling at 72km/hr is to be brought to rest in a distance of 200m then wat should be its retardation (b) if a body starts from rest and and travels 120 m in 8th sec then wats its acceleration.
  14. Physics

    A ship fires its guns with a speed of 400 m/s at an angle of 35 with the horizontal. a. Find the range and maximum altitude. b. If the ship hits a plane that was 12 km away, how high was the plane flying?
  15. Precalculus

    1. A plane takes off, making an angle of a = 17° with the ground. After the plane travels m = one mile along this flight path, how high (in feet) is it above the ground?. (Round your answer to one decimal place.)
  16. High School Geometry

    I am have a hard time understanding how A and B can be No, but C can be Yes on this problem i.imgur (dot)com/rpJQDf3.png I thought that since AD is not perpendicular to the plane m then no lines shooting off of D onto the plane could be perpendicular.
  17. Physics

    A fireman, whose weight is 500 N, slides down a pole with an constant velocity of 3 m/s. The forces that act on him are his weight pulling him down and the force of friction pulling up on him. What is the force of friction and the net force of the fire
  18. physic

    A stationary 2.0 kg object is located on a table near the surface of the earth. The coefficient static friction between the surface is .80 and the coefficient of the kinetic friction is 0.65. A horizontal force of 5N is applied to the object. Determine the
  19. physic

    A stationary 2.0 kg object is located on a table near the surface of the earth. The coefficient static friction between the surface is .80 and the coefficient of the kinetic friction is 0.65. A horizontal force of 5N is applied to the object. Determine the
  20. AP Physics

    What is the minimum work needed to push a 1025 kg car 290 m up a 17.5° incline with zero friction?
  21. physics

    What force is required to slide a 200 kg box up a 25 degree incline if the coefficient of friction is 0.60?
  22. physics

    4. What force is needed to push a 15 N object up a 20° incline at constant speed when the coefficient of friction is 0.30?
  23. physics

    4. What force is needed to push a 15 N object up a 20° incline at constant speed when the coefficient of friction is 0.30
  24. Physics

    Ok I asked this question before A lbock is given an intial speed of 4.0 s^-1 m up the 22 degree plane How far up the plane will it go ok I got this to be something like 2.2 about i understand this i need help on this how much time elapses before it returns
  25. Physics

    A plane is headed due west with an air speed of 221 m/s. The wind blows south at 37.5 m/s. Find the velocity of the plane relative to the earth. The question asks for the magnitude which I found is 224 m/s. The question also asks for the
  26. physics

    The displacement of a block of mass 778g attached to a spring whose spring constant is 38N/m is given by x=Asin(ωt) where A=25cm. In the first complete cycle find the values of x and t at which the kinetic energy is equal to one half the potential energy.
  27. physics

    The pulley in the figure represents different pulleys with outer radius and inner radius indicated in the table. The horizontal rope is pulled to the right at a constant speed that is the same in each case, and none of the ropes slips in its contact with
  28. Arts & Humanities 20th century

    Hi, I am having a severe case of writer's block at the moment. My assignment asks me to pick a popular t.v series, movie, or book that I believe suggests a moral choice. Then briefly provide explanation of the section of the story I believe to be the
  29. Early childhood

    Which of the following ideas will not help children feel personal ownership in their classroom? 1. Giving the child the right to label works in progress,such as block structures,with their name. 2. Labeling a child's school supplies with their name. 3.
  30. Physics

    A car of mass 1060 kg is on an icy driveway inclined at an angle of 39◦ . The acceleration of gravity is 9.8 m/s 2 . θ If the incline is frictionless, what is the acceleration of the car? Answer in units of m/s 2
  31. math

    A carpenter is constructing a triangular roof for a storage shed as shown in the figure. Part A isosceles triangle = 15 degrees and 15 degrees length of bas is 45 How high will the peaks of the rise above in the top of the shed? b/2 = 22.5 tan(15) = h/22.5
  32. Physics

    A man is on his apartment balcony 25m above ground level. He has a fire hose aimed directly at another man who is a ground level, a horizontal distance of 35m from the apartment block. The man on the balcony opens the nozzle and water travels with a speed
  33. statistics

    three blocks of coal were analyzed by four chemists and the ash-content in the block was found to be under blocks chemists 1 11 111 1V A 18 15 15 17 B 17 16 14 14 C 13 16 15 14 DO THE blocks differ in their ash-content?do the chemists differ significantly
  34. Assistance Dogs

    Please check my answer thanks:) Heidi and her sight-impaired owner Becky are walking from school back to Becky's apartment. There's a water-main break in the next block and Heidi turns to take an alternate route to the apartment. Becky tries to continue
  35. 6th Grade Math

    A rectangular packing crate that is 3 feet wide, 4 feet high, and 6 feet long is used to ship jewelry boxes that are 1 foot wide, 1foot long, and 1 foot high. V=lwh. What is the volume of the rectangular packinging crate? I think it's 72 cubic feet. IS
  36. Physics

    The compass in a plane indicates that the plane is heading due east, with an airspeed of 250 km/h (Vpa). A steady wind is blowing with a magnitude of 75km/h, which increases the velocity of the plane, relative to the ground. If the plane is going along a
  37. Physics

    An ore car of mass 37000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 9.9 m lower vertically, is a horizontally situated spring with constant 3.9 × 10 5 N/m. The acceleration of gravity is 9.8 m/s 2 . Ignore
  38. physics

    An ore car of mass 36000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 21 m lower vertically, is a horizontally situated spring with constant5.1×10^5N/m.The acceleration of gravity is 9.8 m/s^2. Ignore friction.
  39. English

    1. I ought to go by plane, shouldn't I? 2. I ought to go by plane, oughtn't I? ------------------------- Which tag question is right?
  40. Physics

    A person 1.90 m tall walks on a horizontal icy surface. The coefficient of friction between the surface of the ice and the person's shoe sole is μ = 0.33 and the length of the person's legs are 1/2 of the person's height. Determine the maximum step
  41. Physics

    A spring is attached to the ceiling of an elevator and a block of mass M is suspended from the spring. In Case A, the elevator moves up with a constant speed of 5 m/s. In Case B, the elevator moves downward with a constant speed of 10 m/s. Will the string
  42. maths

    A tower 7 metres high stands on top of building which is 9 metres high. An observer at the bottom of the building notices that, as she walks away from the building, the angle theta which the tower subtends at her eyes seems to increase in size for a
  43. Chemistry

    Hi, I have a question on column length for HPLC (high performance liquid chromatography). If the column length is increased,eg from 100mm to 150mm and all other column parameters e.g. particle size of stationary phase, internal diameter..etc.remain the
  44. friction

    Our 10kg mystery box rests on a horizontal floor. The coefficient of static friction is 0.4 and the coefficient of kinetic friction is 0.3. Determine the force of friction acting on the box if a horizontal external applied force is exerted on it of
  45. Physics (last question)

    A 800 kg projectile is fired vertically upward with an intitial velocity of 50 m/s. Assuming that no friction is present, how high above the ground will the projectile travel?
  46. English

    I really need help finding all the grammatical errors in the passage below. Look for commas, question marks, capitailzation and colons, semi-colons, commonly misused words. I did most of them I just need help in finishing. Students also realize that a
  47. Language Arts

    Please help me answer this question and the rest of the questions. Where can you find the worksheets you need for each lesson? I would appreciate it if you guys could help me with this question and the rest. Thank You! ^-^
  48. physics

    After landing, a jetliner on a straight runway taxis to a stop at an average velocity of -33.0km/h . If the plane takes 8.00s to come to rest, what are the plane’s initial velocity and acceleration?
  49. physcis

    A 100.0 kg base runner begins his slide into second base when he is moving at a speed of 4.70 m/s. The coefficient of friction between his clothes and Earth is 0.550. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical
  50. Algebra

    Okay, so I am stuck on solving this using the substitution method. The mortgage department of the company is selling two model homes that are located on the same block. The square footage, as well as the type of model, determines the cost of these homes.
  51. phyics

    A box of mass 0.385 kg slides down a very smooth (frictionless) ramp which is inclined at an angle of 56.6° above the horizontal. What is the acceleration of the box down the ramp?
  52. geometry

    A segment that is a units long makes a C-degree angle with a segment that is b units long. In terms of a, b, and C, find the third side of the triangle defined by this SAS description. You have done numerical versions of this question. Start by finding the
  53. Physics

    A 22kg child on a 1.75m long swing is released from rest when the swing supports make an angle of 35 degrees with the vertical. 1.What is the child's maximum potential energy? 2.Disregarding friction, find the child's theoretical speed at the lowest point.
  54. Physics

    A projectile is fired with a velocity u at right angles to the slope, which is inclined at an angle theta with the horizontal. Derive and expression for the distance R to the point of impact. The only think I know to do in this situation is to make the
  55. physics

    If the coaster is going to make it to point C it needs to start with some initial velocity. If point C is 21 meters high and the coaster starts at a height of 20 meters, what would its initial velocity need to be if no energy is lost to friction?
  56. Physics

    A small rocket is fired in a test range. It rises high into the air and soon runs out of fuel. On the way down it passes near an observer (sitting in a 22.5-m-high tower) who sees the rocket traveling at a speed of 37.9 m/s and moving in a vertical plane
  57. Physics

    A top fuel drag racer with a mass of 500.0 kg completes a quarter-mile (402m) drag race in a time of 4.2s starting from rest. The car's final speed is 125m/s. What is the engine's average power output? Ignore friction and air resistance.
  58. Physics

    You are 1.9 m tall and stand 3.3 m from a plane mirror that extends vertically upward from the floor. On the floor 1.6 m in front of the mirror is a small table, 0.75 m high. What is the minimum height the mirror must have for you to be able to see the top
  59. physics

    a playground slide is a place inclined at 48 to the horizontal. a child of mass 25 kg slides down the slide for 4m. calculate the potential energy lost by the child
  60. Physics

    a child slides down a slide with 26 degrees inclined and at the bottom her speed is 1/4 of what it would have been frictionless. Calculate the coefficient of kinetic fiction between the slide and the child?
  61. Physics

    A freight train has a mass of 1.3 x10^7 kg. if the locomotive can exert a constant pull of 5.4x10^5 N, how long would it take to increase the speed of the train from rest to 71 km/h? Disregard friction. Answer in units of s.
  62. Physics

    A freight train has a mass of 1.2 × 107 kg. If the locomotive can exert a constant pull of 5.0 × 105 N, how long would it take to increase the speed of the train from rest to 89.2 km/h? (Disregard friction.) Answer in units of s.
  63. Physics

    A constant force of friction of 50 N is acting on a body of mass 200kg moving initially with a speed of 15m/s. How long does the body take to stop? What distance will it cover before coming to rest?
  64. physic

    If the energy used to heat up a block of 2kg of copper is 115.8 kJ, what is the temperature it was heated to if the starting temperature was 100oC and the specific heat capacity is 386 J/kgK. E=MC(T2-T1) 115800=2*112.85(T2-100) 115800=225.7(T2-100)
  65. physics - rotational motion

    A small car of mass, m, is release at height, h, on a steel track. the car rolls down the track and through the loop of radius, R. at the end of the rack, the car rolls off the track, which is positioned at height, H, above the floor. neglect friction and
  66. Physics

    A car starts from rest and travels for 7.0 s with a uniform acceleration of +2.1 m/s2. The driver then applies the brakes, causing a uniform acceleration of -2.0 m/s2. If the brakes are applied for 1.0 s, determine each of the following. 12.6 m/s at
  67. physics

    The figure shows part of a circuit in which two wire segments are carrying currents as shown. The segment along the z-axis has length 4.0 m and that along the y-axis is 2.5 m long. Under the presence of an externally applied magnetic field B of magnitude
  68. calculus

    a bomb is drooped from an airplane at an altitude of 14,400 feet. how long will it take to reach the ground? (Because of the motionof the plane, the fall will not be vertical, but the time will be the same as that for a vertical fall.) the plane is moving
  69. Calculus

    a bomb is dropped from an airplane at an altitude of 14,400 feet. how long will it take to reach the ground? (because of the motion of the plane, the fall will not be vertical, but the time will be the same as that for a vertical fall.) the plane is moving
  70. help

    A car starts from rest and travels for 8.0 s with a uniform acceleration of +2.4 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.0 m/s2. If the brakes are applied for 1.0 s, determine each of the following.
  71. physics - Energy

    An ore car of mass 41000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 9.6 m lower vertically, is a horizontally situated spring with constant 4.7 × 10^ 5 N/m. The acceleration of gravity is 9.8 m/s^ 2. Ignore
  72. Physics

    An ore car of mass 44000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 26 m lower vertically, is a horizontally situated spring with constant 4.5 × 105 N/m. The acceleration of gravity is 9.8 m/s 2 . Ignore
  73. physic..plz check if corrected

    If the energy used to heat up a block of 2kg of copper is 115.8 kJ, what is the temperature it was heated to if the starting temperature was 100oC and the specific heat capacity is 386 J/kgK. E=MC(T2-T1) 115800=2*112.85(T2-100) 115800=225.7(T2-100)
  74. physics

    Assume the height of a hill is 50m, calculate: a.the velocity of a car at the bottom ofg the hill b.the height at which it will have half the speed. Assume the car starts from rest at the top of the hill.
  75. Gen Chem II

    This is in a nuclear radiation lab. (gamma rays from Cs 137 passing through lead. initial radiation (with one plate) 500cpm final radiation intensity with 2 plates 300cpm thickness of 1 absorbing plate in centimeters 0.635 I need to figure out the
  76. General Physics Pt.2

    A proton is projected in the positive x direction into a region of uniform electric field E = -5.30*10^5 i N/C at t = 0. The proton travels 6.50 cm as it comes to rest. (a) Determine the acceleration of the proton. -5.07E13 (-i) m/s^2 (b) Determine the
  77. geometry

    Jason designed an arch made of wrought iron for the top of a mall entrance. The 11 segments between the two concentric circles are each 1.25 m long. Find the total length
  78. dynamics of rigid bodies

    7. A 1800 kg car drives up an inclined of 8% from rest at uniform acceleration to a velocity of 60 kph after traveling 75 m. Its wheels are 3 m apart with its center of gravity midway of the wheels and 500 mm from the ground. If all frictional force is
  79. 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 0.420 . Suddenly, the plane accelerates forward, its altitude remaining constant. What
  80. physics

    Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0 V batteries of a 740 kg electric car be able to supply: (a) To accelerate from rest to 25.0 m/s in 1.00 min? (b) To climb a 200 m high hill in 2.00
  81. physics

    Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0 V batteries of a 740 kg electric car be able to supply: (a) To accelerate from rest to 25.0 m/s in 1.00 min? (b) To climb a 200 m high hill in 2.00
  82. physics

    In a phsics experiment, a 1.3 kg dynamics cart is placed on a ramp inclined at 25 degrees to the horizontal. the cart is initially at rest but is then pulled up the ramp with a force sensor. the force sensor exerts a force on the cart parallel to the ramp.
  83. physics

    A water slide is constructed so that swimmers, starting from rest at the top of the slide leave the end of the slide traveling horizontally. There is still a height between the surface of the water and the end of the slide. One person hits the water 5.00m
  84. physics

    A ball is projected horizontally from the top of a 98m high cliff with an initial speed of 14.4 m/s. Determine the magnitude of the final speed the instant prior to hitting the ground
  85. Calc

    A plane is heading on a bearing of 200° with an air speed of 400 km/h when it is blown off course by a wind of 100 km/h from the northeast. Determine the resultant ground velocity of the plane.
  86. MATH HELP asap PLEASE

    A plane is steering at S83degreesE at an airspeed of 550 km/h. the wind is from N70degreesE at 85 km/h. Determine the ground velocity of plane to one decimal. Use the cosine and sine law.
  87. Solvents

    Question: When a TLC plate ws developed, the solvent front ran off the top of the plate. What should be done to correct the error. Me: The only reason I'm giving you this question to check is that it seems too simple. My answer would be to stop development
  88. physics

    A box of mass 1.95 kg slides down a frictionless ramp inclined at an angle θ= 42.9 ° at constant speed. The force exerted on the box by the ramp is how many Newtons?
  89. Physics - Check my work please :)

    Check this please :D Which of the following three statements used to describe work are true: i)Work is done only if an object moves through a distance ii)Work is done only if energy is transferred from one form to another iii)Work is done only if a force
  90. PHYSICS

    How do I solve this? A mine car (mass=380 kg) rolls at a speed of 0.50 m/s on a horizontal track, as the drawing shows. A 170-kg chunk of coal has a speed of 0.92 m/s when it leaves the chute (at a 25 degree incline). Determine the speed of the car–coal
  91. analytic geometry

    1. Find the longest and shortest distance from (10, 7) to the circle x^2 + y^2-4x-2y-20=0 2. From the start, a man runs 4km towards north, 3 km towards east and takes a rest. Draw the line from starring point to resting point and line from resting point to
  92. physics

    A train is traveling up a 3.6 incline at a speed of 3.30 when the last car breaks free and begins to coast without friction.
  93. Physics please help

    He drops a ninja ball device from a height of 10.0m. The mass of the enter device is 190g and the mass of the top (smallest) ball is 2.90g A) calculate the momentum of the device as it hits the ground (ignore air resistance) I know that this answer is 2.66
  94. physics

    Why is it impossible for a skier to reach maximum speed that is physically possible by converting the change in height to speed? what is this question asking? Some of the potential energy available is lost due to friction. Friction on the skis, friction on
  95. Physics

    If a 2 m tall man is looking at a plane mirror from an eye which is 20 cm from the top of his head, what is the minimum length that the mirror must be so that he can just barely see his whole body in the mirror? How far up from the ground must the mirror
  96. Physics

    A piece of luggage is being loaded onto an airplane by way of an inclined conveyor belt. The bag, which has a mass of 10.0 kg, travels 6.50 m up the conveyor belt at a constant speed without slipping. If the conveyor belt is inclined at a 60.0° angle,
  97. Physics

    A piece of luggage is being loaded onto an airplane by way of an inclined conveyor belt. The bag, which has a mass of 20.0 kg, travels 6.50 m up the conveyor belt at a constant speed without slipping. If the conveyor belt is inclined at a 40.0° angle,
  98. p

    The displacement of a block of mass 778g778g attached to a spring whose spring constant is 38N/m38N/m is given by x=Asin(ωt)x=Asin(ωt) where A=25cmA=25cm . In the first complete cycle find the values of xx and tt at which the kinetic energy is equal to
  99. Oral speech

    Persuasive speech comparing old to modern games? I have to have a persuasive speech lasting 8-10 minutes, in which i am trying to persuade the listeners that modern games have came away from the "point" of a video game. and that old school games like SNES
  100. Physics

    an object of mass m1= 311 g on an inclined surface. The angle of the inclined surface is θ = 40o with the horizontal. The object m1 is connected to a second object of mass m2 = 355 g on the adjacent horizontal surface. Further, an external force of