1. physics

    A particle is acted upon a body by the following forces: 55N Towards East,45N inclined at(E 80 Degrees Towards North East),50N Towards North East, 60N inclined at (E 20 Degrees towards South of West),40N Towards South. Determine the magnitude and direction

    asked by justine on October 2, 2018
  2. PHYSICS

    A factory worker pushes a 30.7 crate a distance of 4.0 along a level floor at constant velocity by pushing downward at an angle of 31 below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.26. What magnitude of force

    asked by HANNE on October 11, 2012
  3. College physics

    dockworker applies a constant horizontal force of 80.0N to a block of ice on a smooth horizontal floor. thhe block starts from rest and moves 11.0m in 5.00s. (a) what is the mass of the ice block? (b) if the work stops pushing at the end of the 5.00s, How

    asked by Lesego on April 10, 2014
  4. Social studies

    1. Which of these people is part of the labor force a.an eighth grader with a paper route b. a retired sales person c. a full time college student d.an auto mechanic•• 2. Which is the best example of frictional unemployment? A plumbers contract with an

    asked by Kayla on May 10, 2017
  5. Principles of Law Enforcement

    After seeing a story on the local news about a police officer suspended for allegedly using excessive force to quell a disturbance at a night club, you decide to write a letter to the editor of your local paper. In a short letter, examine the importance of

    asked by DTD on May 1, 2008
  6. Anthropology

    Lecture, desks, class hours, and writing boards are all part of the class: a)stratification b)rank C)social situation d)status e)role The term mana is best defined as: a)a member of hierarchy of priests b)the implements used in magical ceremonies c)a

    asked by TAYLOR M B on December 15, 2011
  7. Heat and properties of matter

    1. How much pressure do you experience, when you balance a 5kg ball on the tip of your finger which has an area of 1cm square. a. 490 kpa b. 4600 pa c. 34n d. No answer 2. Heat can be define as a. The change in the temprature of a body b. The flow of

    asked by Mutiyat on April 23, 2015
  8. Science

    The surface r of a liquid depends on the density p acceleration due to gravity g nd height h use the method of dimension to derive the actual relationship between this quantities. An object is tie to the end of a string move in a circle the force exerted

    asked by Mary on January 29, 2017
  9. Physics

    A 0.03-kg bullet is fired vertically at 200m/s into a 0.15-kg baseball that is initially at rest. The bullet lodges in the baseball and, after the collision, the baseball/bullet rise to a height of 37m. (a). What was the speed of the baseball/bullet right

    asked by Annie on February 14, 2013
  10. science

    The greatest and least resultant of two forces acting at a point is 29 kgwt and 5 kgwt respectively.If each force is increased by 3 kgwt.Find the resultant of the two new forces when acting at right angles to each other?

    asked by Ankit on April 29, 2017
  11. science

    The greatest and least resultant of two forces acting at a point is 29 kgwt and 5 kgwt respectively.If each force is increased by 3 kgwt.Find the resultant of the two new forces when acting at right angles to each other?

    asked by Ankit on April 28, 2017
  12. Please help!!!!!Physics

    Find the resultant force on (a) the mass m1 = 0.183 kg and (b) the mass m2 = 0.106 kg (the masses are isolated from the earth).. The first mass is 400kg and its 10 cm from the second mass which is 0.183 kg (m1). the second mass is 10 cm away from the third

    asked by kellie on September 29, 2011
  13. physics

    a 5.9 kg bucket of water is raised from a well by a rope. the acceleration of gravity is 9.81 m/s^2 if the upward acceleration of the bucket is 4.0 m/s^2 what is the force exerted by the rope on the bucket of water. in units of N

    asked by Claudia on October 15, 2008
  14. physics

    a 5.1 kg bucket water is raised from a well by a rope. the acceleration of gravity is 9.81 m/s^2. if the upward acceleration of the bucket is 4.5m/s^2, find the force exerted by the rope on the bucket of water.

    asked by Mayra on January 20, 2011
  15. Physics (please help!!)

    A suitcase of weight mg = 450 is being pulled by a small strap across a level floor. The coefficient of kinetic friction between the suitcase and the floor =0.640 a) Find the optimal angle of the strap above the horizontal. (The optimal angle minimizes the

    asked by Catherine on February 18, 2011
  16. Engineering

    The boat is to be pulled onto the shore using two ropes. If the resultant force is to be 400N, directed along the keel, determine the magnitudes of forces T and P acting in each rope and the angle theta of P so that the magnitude of P is a minimum. T acts

    asked by Claire on October 13, 2009
  17. PHYSICS

    8) A rock of mass 400 g is tied to one end of a string that is 2.0 m in length and swung around in a horizontal circle. It takes 2 s to complete one circle. a. Find the angular velocity of the rock just as the string breaks. b. At what speed is the rock

    asked by Anonymous on September 19, 2011
  18. physics

    The pressure of a gas in a container is estimated to be the force exerted per cross-sectional area. If a factor F=(20.0+/-0.5)N.acts on a rectangular cross-section of the container with dimensions x=(5.0+/-0.5). Calculate fractional change in pressure and

    asked by Nonhlanhla on August 28, 2014
  19. physics

    A 4.30 kg block is pushed along a floor by a constant applied force that is horizontal and has a magnitude of 43.0 N. The figure gives the block's speed v versus time t as the block moves along an x axis on the floor. The scale of the figure's vertical

    asked by rochelle on September 9, 2015
  20. Physics

    A car of mass 1380 kg rests on a hydraulic lift with a piston of radius 0.24 m that is connected to a second piston of radius 0.029 m. If the car is just barely lifted off the ground, what is the force at the second piston? my work: 1380kg/.24m = F/.029m

    asked by Wrenn on November 14, 2015
  21. PHYSICS

    A diving board length L = 5.20m that weighs 205N is supported by two pillars. One pillar is at the left end of the diving board, as shown below; the other is distance d = 1.70m away. Find the magnitude of the force exerted by the left pillar when a 90.0kg

    asked by Lauren on December 3, 2014
  22. Physics

    A force of 40 N is applied at an angle of 30oabove the horizon to a 5 kg block that is at rest on a rough horizontal surface. After the block starts to move with an acceleration of 3 m/s2, what is the coefficient of kinetic friction between the block and

    asked by Angela on May 15, 2009
  23. college physics

    If I travel to Mexico and buy a 55g gold braclet for 20 dollars and take the braclet and submerge it in water starting out with 50cc and after it is submerged in the water it is 52.8cc. What is the buoyant force on the braclet? I also need to know if the

    asked by patti on March 18, 2013
  24. Physics

    The front 1.20 m of a 1,350-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. (a) If a car traveling 22.0 m/s stops uniformly in 1.20 m, how long does the collision last? s (b) What is the magnitude of the average

    asked by Allie on October 4, 2011
  25. physics

    The front 1.20 m of a 1,350-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. (a) If a car traveling 21.0 m/s stops uniformly in 1.20 m, how long does the collision last? s (b) What is the magnitude of the average

    asked by mark on March 3, 2016
  26. Earth science

    Please go over my answers and tell me what I got wrong... Telling me the correct answer would also be nice please hurry I only have 20 mins What does the principle of uniformitarianism tell us about the past? (Points: 5) The past is the key to the future.

    asked by Ario on January 29, 2010
  27. Physics

    A 2.2 C charge is located on the x-axis at x = -1.5 m. A 5.4 C charge is located on the x-axis at x = 2.0m. A 3.5 C charge is at the origin. Find the net force acting on the 3.5 C charge.

    asked by Anonymous on March 16, 2014
  28. Physics

    A 2.2 uC charge is located on the x-axis at x = -1.5 m. A 5.4 uC charge is located on the x-axis at x = 2.0m. A 3.5 uC charge is at the origin. Find the net force acting on the 3.5 C charge.

    asked by Anonymous on March 16, 2014
  29. Physics

    A 2.2 C charge is located on the x-axis at x = -1.5 m. A 5.4 C charge is located on the x-axis at x = 2.0m. A 3.5 C charge is at the origin. Find the net force acting on the 3.5 C charge.

    asked by Anonymous on March 16, 2014
  30. physics

    A force of 7.36 N acts on a(n) 2.1 kg object for 24.7 s. What is the object’s change in momentum? Answer in units of N · s What is its change in velocity? Answer in units of m/s

    asked by dimitry on January 30, 2012
  31. science

    a 5.o kg book is sitting on a table. which describes the forces acting on the book? a)there are no forces acting on the book b)the net force on the book is zero

    asked by Anonymous on July 26, 2010
  32. Physics help!

    An alpha particle(charge +2e) is sent at a speed towards a gold nucleus( +79e ). 1) what is the electric force acting on the alpha particle when it is 2.0 x 10^-14 m from the gold nucleus. 2) if the alpha particle came to a stop at this position after

    asked by Happiness delight on August 14, 2017
  33. COLLEGE PHYSICS

    A car with mass of 1400kg is towed with a net force of 4500N. the car starts from rest, find the speed of the car traveled after it traveled 100m. W=FnetX distance=ma x distance 4500N=(1/2)1400kg V^2 2.5m/s=V is this right? if not what am i doing wrong?

    asked by Anonymous on October 21, 2007
  34. physics

    (a) A bathroom scale has a spring that is compressed by 1.50 cm when a 165 kg person stands on the scale. Assuming the spring is described by Hooke's law, find its force constant. (b) How much would it be compressed if a 94.0 kg person stands on the scale

    asked by Justin on July 28, 2013
  35. physics

    A 5 g bullet is fired into a 2 kg wooden block attached to a spring with a force constant of 20 N/m. It lodges in the block, and the block and bullet compress the spring until they come to a rest. If the bullet was moving at 1000 m/s just before the

    asked by shawn on July 18, 2012
  36. Physics

    A 76.3-kN car is travelling at 68.7 mph when the driver decides to exit the freeway by going up a ramp. After coasting 355 m along the exit ramp the car\'s speed is 30.1 mph, and it is h = 14.3 m above the freeway. What is the magnitude of the average drag

    asked by Help on April 29, 2013
  37. Physics

    A 10kg box is pulled a distance of 100m along a level floor at constant velocity using a force of 40 N at an angle of 35 degrees above the horizontal. If the box is pulled at constant velocity, what is the coefficient of friction between the bottom of the

    asked by Holly on November 11, 2009
  38. physics

    Three liquids that will not mix are poured into a cylindrical container. The volumes and densities of the liquids are 0.35 L, 2.6 g/cm3; 0.25 L, 1.0 g/cm3; and 0.40 L, 0.60 g/cm3. What is the force on the bottom of the container due to these liquids? One

    asked by rock on January 28, 2011
  39. Physics HW Help, Please

    A 76.3-kN car is travelling at 66.5 mph when the driver decides to exit the freeway by going up a ramp. After coasting 418 m along the exit ramp the car\'s speed is 27.3 mph, and it is h = 10.7 m above the freeway. What is the magnitude of the average drag

    asked by Michael on November 12, 2012
  40. physics

    If Earth's mass were suddenly and magically reduced to half its present value, the Sun's gravitational force on Earth would A. be reduced by a factor of 2. B. be reduced by a factor of 4. C. increase by a factor of 2. D. remain the same. I was told it

    asked by anonymous on March 11, 2014
  41. Physics

    A 75.0g bullet is fired at a muzzle velocity of 476 m/s from a gun with a mass of 4.75kg and a barrel length of 60.0cm. a. How long is the bullet in the barrel? b. What is the force of the bullet while it is in the barrel? c. Find the impulse given to the

    asked by Jack Binns on March 7, 2012
  42. math

    ol' santas pack held thirty toys made by his elfin crew; and though none made the same amount, each elf made more than two. the elf named cher made one more toy than the elf who dressed in reds, but cher made one less christmas toy than the elf who made

    asked by Sabeva on December 29, 2008
  43. Social studies

    which of the following is true about textiles and georgia economy 1. the states textile industry has found it difficult to complete with overseas textile industries 2. four major carpet companies are located in goergia 3.georgia is a world leader in carpet

    asked by Anastasia on May 20, 2016
  44. Physics

    A student spins a 1.2kg rock around above her head horizontally in an experiment which aims to model how satellites orbit the earth. The student counts 3 orbits per second when the string produces an orbit radius of 35cm. (a) Calculate the centripetal

    asked by Alfred on August 31, 2009
  45. PHYSICS LEC

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

    asked by josh on August 16, 2010
  46. physics

    A 1.90-kg object is attached to a spring and placed on frictionless, horizontal surface. A horizontal force of 14.0 N is required to hold the object at rest when it is pulled 0.200 m from its equilibrium position (the origin of the x axis). The object is

    asked by Roo Kun on January 26, 2011
  47. PHYSICS

    A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 23.0 degrees with the horizontal. A piece of luggage having

    asked by Luke on September 21, 2009
  48. Physics

    A baby elephant is stuck in a mud hole. To help pull it out,game keepers use a rope to apply force FA, as part(a) of the drawing shows. By itself, however, forceFA is insufficient. Therefore, two additionalforces FB and FC are applied, as in part (b)of the

    asked by Anonymous on August 31, 2012
  49. physics 1

    A person is sitting with one leg outstretched and stationary, so that it makes an angle of 30.0° with the horizontal, as the drawing indicates. The weight of the leg below the knee is 50.5 N, with the center of gravity located below the knee joint. The

    asked by Anonymous on April 13, 2014
  50. Social Studies

    Which of the following is true about textiles and Georgia's economy? (3 points) a. The state's textile industry has found it difficult to compete with oversea textile industries. b. Four major carpet companies are located in Georgia*** c. Georgia is a

    asked by Anonymous on March 27, 2018
  51. Physics

    A block of mass 0.4 kg rests on the inclined surface of a wedge of mass 1.7 kg. The wedge is acted upon by a horizontal force F~ and slides on a frictionless surface. The acceleration of gravity is 9.81 m/s2. If the coefficient of static friction between

    asked by Amanda and Leah on October 8, 2012
  52. physics

    In the movie Superman, Lois Lane falls from a building and is caught by the diving superhero. Assuming that Lois, with a mass of 45 kg, is falling at a terminal velocity of 59 m/s, how much force does Superman exert on her if it takes 0.4 s to slow her to

    asked by Anonymous on February 22, 2011
  53. physics

    In the movie Superman, Lois Lane falls from a building and is caught by the diving superhero. Assuming that Lois, with a mass of 45 kg, is falling at a terminal velocity of 59 m/s, how much force does Superman exert on her if it takes 0.4 s to slow her to

    asked by Anonymous on February 22, 2011
  54. science

    i'm not sure witch statement is true .The earth has a stronger gravitational pull than the Sun because it is smaller in mass. .Planets would travel in a straight line if it weren't for the force of the Sun's gravity. .The Sun's gravitational pull is weaker

    asked by Alie on October 23, 2008
  55. Physics

    At the top of an inclined track, a spring is attached to a rod at one end and a dynamics cart at the other such that the spring stretches parallel to the track. The cart has a mass of .850kg and there is negligible friction between the cart and the track.

    asked by Chris on March 3, 2014
  56. Physics

    A combination lock has a 1.2 cm -diameter knob that is part of the dial you turn to unlock the lock. To turn that knob, you grip it between your thumb and forefinger with a force of 0.62 N as you twist your wrist. Suppose the coefficient of static friction

    asked by Leanna on April 1, 2013
  57. Physics

    A combination lock has a 1.2 cm -diameter knob that is part of the dial you turn to unlock the lock. To turn that knob, you grip it between your thumb and forefinger with a force of 0.62 N as you twist your wrist. Suppose the coefficient of static friction

    asked by Leanna on March 31, 2013
  58. Physics

    A construction worker attempts to lift a uniform beam off the floor and raise it to a vertical position. The beam is 2.50m long and weighs 500N. At a certain instant the worker holds the beam momentarily at rest with one end at distance d=1.50m above the

    asked by Monique on January 10, 2011
  59. physics

    A construction worker attempts to lift a uniform beam off the floor and raise it to a vertical position. The beam is 2.50m long and weighs 500N. At a certain instant the worker holds the beam momentarily at rest with one end at distance d=1.50m above the

    asked by Ngoc on January 10, 2011
  60. physics

    a 20kg block is connested to a 30kg block by a string that passes over a frictionless pully. the 30kg block is connected to a spring that has niglible mass and a force constant of 250n/m.the 20kg block is pulled 20cm down the incline(40 degrees) and

    asked by sello on April 7, 2010
  61. physics

    A car of weight W = 12.3 kN makes a turn on a track that is banked at an angle of θ = 20.9°. Inside the car, hanging from a short string tied to the rear-view mirror, is an ornament. As the car turns, the ornament swings out at an angle of φ = 28.3°

    asked by ayhan on August 1, 2012
  62. physics

    Suppose we wish to use a 4.0 m iron bar to lift a heavy object by using it as a lever. If we place the pivot point at a distance of 0.5 m from the end of the bar that is in contact with the load and we can exert a downward force of 640 N on the other end

    asked by lol on November 16, 2014
  63. world history

    At the end of World War I the Allieds had established the League of Nations as an international organization designed to ensure global peace, but it had failed miserably due to the fact that it did not possess the military force necessary to enforce any of

    asked by Sue on May 4, 2008
  64. Physics

    A)a 72 kg man jumps from a window 1.2 m above a sidewalk. the acceleration of gravity is 9.81 m/s2. what is his speed just before his feet strike the pavement? answer in units of m/s B) if the man jumps with his knees and ankles locked, the only cushion

    asked by John on February 3, 2011
  65. physics

    4. An ice skater pulls three small children, one behind the other, with masses 25kg, 31 kg and 35kg. Assume that the ice is smooth enough to be considered frictionless, determine: a) the total force applied to the train of children if they reach a speed of

    asked by Sandy on October 24, 2010
  66. Science

    For a reaction to occur, the energy of the system must meet the activation energy threshold. Which best explains why increasing the temperature increases the rate of a reaction? A) Because more particles spread out away from each other B) Because more

    asked by Kaylee on February 15, 2019
  67. Physics

    A spherical 0.34 kg orange, 2.0 cm in radius, is dropped from the top of a building of height 31 m. After striking the pavement, the shape of the orange is a 0.60 cm thick pancake. Neglect air resistance and assume that the collision is completely

    asked by Tired on November 4, 2010
  68. Physics

    A 3.0g bead has been threaded onto a vertical, frictionless, circular hoop with a 20cm radius. The bead is released from rest at 25º below the vertical. (a) Find the speed of the bead when it is 70° below the vertical. (b) Using the free-body diagram

    asked by Randall on July 30, 2014
  69. Physics

    a block of mass m=10kg is released from rest on a frictionless incline of angle=30°. Theass can be compressed 2.0cn by a force of 200N. The block momentarily stops when it compresses the spring by 5cm.. How far does fge block mobe down fge incline from

    asked by Edouina Alice on January 9, 2019
  70. Physics , static fluids

    A particular object weighs 313 N in air and 264 N when immersed in alcohol of density 0.70 g/cm3. What is the volume (in L) and the density (in kg/m3) of the object? I had origionally used the 264N as the force of buoyancy and did the Fb=density*volume*g,

    asked by Andrea on November 26, 2016
  71. Physics

    "An athlete whirls a 3.7kg shot-put in a horizontal circle with a radius of 0.90m. If the period of rotation is 0.30s, how far would the shot-put travel horizontally if it is released 1.2m above the level ground?" There were two other parts to the question

    asked by Stuck on July 14, 2010
  72. Physics I for College

    a rope that makes an angle of 30 degrees with the horizontal drags a crate along the floor. what must be the tension in the rope if a horizontal force of 40N is needed to drag the crate? please help me. i really didn't understand what my professor told me.

    asked by Ian on June 23, 2014
  73. Physics

    An block of mass , starting from rest, slides down an inclined plane of length and angle with respect to the horizontal. The coefficient of kinetic friction between the block and the inclined surface is . At the bottom of the incline, the block slides

    asked by sied on October 10, 2013
  74. Algebra 1

    A kicker punts a football from 3 feet above the ground with an initial velocity of 47 feet per second. 1. Write an equation that gives the height (in feet) of the football as a function of the time (in secs) since it was punted. Okay. According to my text

    asked by Ginny on February 22, 2014
  75. College Physics

    As part of a training program, an athlete runs while holding 8.00 weights in each hand. As he runs, the weights swing through a 30.0 arc in . His hands are 72 from his shoulder joint, and they are light enough that we can neglect their weight compared with

    asked by Matt on October 10, 2010
  76. Physics

    A boy weighing 650 N wants to cross a creek by using a 5.00 meter long plank as a bridge. He places the plank across the creek and begins to walk across. Consider the supporting forces to be at the ends of the plank, and the plank itself to be weightless.

    asked by Anonymous on August 4, 2017
  77. physics

    a vertical dock gate is 5m wide and is hinged at 1m from the base of the dock. the dock has sea water with density of 1025 kg /m^3 to a depth of 7.5 on one side and fresh water to depth of 3m on the other side a) find the resultant horizontal force b)

    asked by moody on January 13, 2014
  78. physics

    A 49-kg bungee jumper has fallen far enough that her bungee cord is beginning to stretch and resist her downward motion. Find the force (magnitude and direction) exerted on her by the bungee cord at an instant when her downward acceleration has a magnitude

    asked by brian on January 27, 2011
  79. physics

    Question Part Points Submissions Used 1 2 –/1 –/2 0/3 0/3 Total –/3 A force of 12.8 N pulls horizontally on a 0.9 kg block that slides on a rough, horizontal surface. This block is connected by a horizontal string to a second block of mass m2 = 2.04

    asked by Anonymous on October 9, 2012
  80. physics

    The small mass m sliding without friction along a looped track is to remain on the track at all times, even at the very top of the loop of radius r. a) In terms of the given quantities, determine the minimum release height h b) If the actual release height

    asked by Emma on November 24, 2012
  81. physics

    When the thigh is fractured, the patient's leg must be kept under traction. One method of doing so is a variation on the Russell traction apparatus. (See the figure.) Please place period in place of (dot) oi53(dot)tinypic(dot)com/2a0b7yx(dot)jpg If the

    asked by nancy on March 4, 2011
  82. Science

    If you swung a bucket of water quickly in an upside down circular path, the water would not fall out of the bucket. Which of the following best describes why this happens? a. Due to centripetal force, the water is pushing on the bottom of the bucket.*****

    asked by Anonymous on February 7, 2018
  83. Physics

    This is about Elastic Springs.. so far I've answered every question. This is the only one I don't get. It's so confusing for me.. In the laboratory, you attach 300 g mass to a spring of negligible mass and start oscillating it. The elapsed time from when

    asked by Mr. Desperate on February 16, 2013
  84. physics

    An amusement park ride consists of a car moving in a vertical circle on the end of a rigid boom of negligible mass. The combined weight of the car and riders is 5.0 kN, and the circle’s radius is 10 m. At the top of the circle, what are the (a) magnitude

    asked by tucker on February 26, 2010
  85. Physics

    Two spherical objects are separated by a distance of 2.70 × 10-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As

    asked by Brandon on April 21, 2019
  86. Physics

    "A fish hangs from a spring scale supported from the roof of an elevator. If the elevator has an upward acceleration of 1.2m/s^2 and the scale reads 200N, under what circumstances will the scale read 150N? What will the scale read if the elevator cable

    asked by Stuck on July 12, 2010
  87. physics

    As part of a training schedule a weightlifter pushes a heavy metal block along the floor. The lifter applies a force of 850 N downwards on the block at an angle of 65° to the vertical (25° to the horizontal). The weightlifter pushes the block forwards 4

    asked by alex on February 28, 2012
  88. physics

    Two spherical objects are separated by a distance of 1.53 × 10-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As

    asked by Lily on July 28, 2014
  89. physics

    a person attaches a 25kg hay bale to one end of a rope passing over a frictionless pulley connected to a beam in the hay barn. another person then pulls down on the opposite end of the rope with a force of 277-N Ignoring the mass of the rope what will be

    asked by Kelsey on March 25, 2012
  90. physics

    Two spherical objects are separated by a distance of 1.41 × 10^-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons.

    asked by shaun on February 14, 2013
  91. Physics

    Continuously running exhaust hoods in a university chemistry building keep the inside air pressure slightly lower than outside. A student notices that a 175 N force is necessary to start opening a 1.2 m by 2.3 m door. The door is hinged on one of its 2.3 m

    asked by Constance on December 4, 2012
  92. Physics

    A spring of negligible mass stretches 3.00 cm from its relaxed length when a force of 7.10 N is applied. A 0.440-kg particle rests on a frictionless horizontal surface and is attached to the free end of the spring. The particle is displaced from the origin

    asked by Anonymous on January 29, 2015
  93. physics

    1. It has been suggested that rotating cylinders about 11 mi long and 5.2 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall

    asked by Elisa on July 14, 2008
  94. physics

    The figure below shows an initially stationary block of mass m on a floor. A force of magnitude F = 0.570·mg is then applied at upward angle è = 22°. (a) What is the magnitude of the acceleration of the block across the floor if (a) ìs = 0.600 and ìk

    asked by Will on November 18, 2010
  95. Social Studies

    Why did Washington and his troops cross the Delaware River in small boats on Christmas night, 1776? A. The weather was good and the troops hoped to find a sheltered place to rest. B. Washington was leading them to a surprise attack on the British at

    asked by Aralyn on November 10, 2016
  96. Physics

    A 49-N force is applied perpendicular to the portion BC of the bent bar. Determine the moment of P about point B and about point A. The image shows a bar that is straight from point A to B but then bends at a 42 degree angle to the left from point B to

    asked by Bryan on September 3, 2014
  97. Physics - Fluids

    A cube of side length 11.0 cm and made of unknown material floats at the surface between water and oil. The oil has a density of 810 kg/m^3. a)If the cube floats so that it is 70% in the water and 30% in the oil, what is the mass of the cube? b)What is the

    asked by Nik on April 25, 2008
  98. physics. please help

    A worker pushes a 820 N crate with a horizontal force of 345 N a distance of 24 m. Assume the coefficient of kinetic frictin between the crate and the floor is 0.22. a) How much work is done by the worker on the crate? b) How much work is done by the

    asked by Alecia on December 9, 2010
  99. PHYSICS

    A basket is being dragged across a horizontal floor by two horizontal rope A and B which are inclined at 36 degree and 27 degree respectively with the direction in which the basket is moving.Rope A has a tension of 20Newton.Find the tension in rope B and

    asked by TOSIN on September 4, 2015
  100. friction

    A 40 kg slab rests on a friction less floor.a 10 kg block rests on top of the slab.the coefficient kinetic friction between the block and the slab is 0.40.a horizontal force of 100N is applied on the 10 kg block.find the resulting acceleration of the slab.

    asked by mahesh on September 28, 2014