1. Physics

    At t = 0, an automobile traveling north begins to make a turn. It follows one-quarter of the arc of a circle of radius 10.1 m until, at t = 1.52 s, it is traveling east. The car does not alter its speed during the turn. (a) Find the car's speed. (b) Find

    asked by Alyssa on September 23, 2012
  2. Chemistry

    In an alternate universe, electron energies in an atom are found to obey the following equation where n is the principle quantum number: E = 3.0 x 10^(-19) J * nm * (1/n^2) ..where n is the principle quantum number A gas discharge lamp, like the lamps used

    asked by Nora on April 15, 2015
  3. Chemistry

    In an alternate universe, electron energies in an atom are found to obey the following equation where n is the principle quantum number: E = 3.0 x 10^(-19) J * nm * (1/n^2) ..where n is the principle quantum number A gas discharge lamp, like the lamps used

    asked by Nora on April 15, 2015
  4. Physics

    A spring with k = 54 N/cm is initially stretched 1 cm from its equilibrium length. (a) How much more energy is needed to further stretch the spring to 2 cm beyond its equilibrium length? (b) From this new position, how much energy is needed to compress the

    asked by Kelly on June 2, 2012
  5. Physics- Energy Released In Chemical Reaction

    The reaction between two hydrogen isotopes is shown below: 2H + 3H → 4He + n + energy released The energy released in this reaction is: a.equal to that in a fission reaction b.equal to that in a chemical reaction. c.less than that in a chemical reaction.

    asked by MM on December 15, 2016
  6. Grade 9 Chemistry (2)

    What is one way in which Noble Gases are different from other elements? a. Noble Gases have low boiling points b. Noble gases have high melting points c. Noble gases have extremely high densities d. Noble gases have unusually high atomic masses Also, what

    asked by Erika on June 20, 2012
  7. physics

    A person is to run a circular track with a radius of 93 meters. The person starts at a certain spot and runs 3 and 1/2 times around the track in a time of 227 seconds. Find the magnitude of average velocity for this trip (|vav|) and find the average speed

    asked by Marc on September 3, 2011
  8. physics

    A person is to run a circular track with a radius of 93 meters. The person starts at a certain spot and runs 3 and 1/2 times around the track in a time of 227 seconds. Find the magnitude of average velocity for this trip (|vav|) and find the average speed

    asked by Jeff on September 1, 2011
  9. science

    What is the speed of motorist B? By what percentage did motorist A increase his speed for the second hour from the first hour? What is the speed of motorist A for the second hour? When motorist B reached his destination,how far behind was motorist A?

    asked by zoha on October 18, 2016
  10. physics

    A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 22 minutes at an average speed of 6.80 m/s. During the second part, she rides for 36 minutes at an

    asked by Hillary on October 8, 2010
  11. physics

    A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 22 minutes at an average speed of 6.80 m/s. During the second part, she rides for 36 minutes at an

    asked by Hillary on October 8, 2010
  12. Physics

    A bird wants to rech its nest that is located 53 meters (35 degrees south of west) from where it is perched. If the maximum speed that the bird can fly with respect to the air is 12m/s and there is a wind blowing from a direction of east 35 degrees south

    asked by Carla on October 12, 2015
  13. y no one anwering my ques

    How does active transport differ from passive transport? 1. Molecules move down a concentration gradient in active transport. 2. Carrier proteins are used only in active transport. 3. Energy is required only in active transport. 4. Energy is required only

    asked by anmol on February 19, 2012
  14. Physics

    You have a 4.5 kg lead block at room temperature. Find the energy required to raise the lead's temperature to its melting point. Find the energy required to melt the lead once it's reached the melting point.

    asked by Anonymous on April 27, 2017
  15. Intro to Psychiology 1

    Within each gene, elements of DNA are arranged in a particular order, forming a code that influences the synthesis of particular proteins. This code affects every aspect of the body, from its structure to the chemicals that keep it running. The above

    asked by Anonymous on August 25, 2009
  16. english 11

    I need help finding out if i underlined the correct words that are nouns. If you wouldnt mind helping could you tell me what words are nouns so i know if i did it right? 1)The time was running out on the contest. 2)Even when she took the cold medicince,

    asked by Tara on September 23, 2007
  17. physics

    A car travels 0.90 km at an average speed of 84.8 km/h and then 0.97 km at an average speed of 41.6 km/h. What is the car's average speed during the 1.87 km interval?

    asked by Kim on January 15, 2010
  18. physics

    A 853-kg car stopped at an intersection is rear-ended by a 1450-kg truck moving with a speed of 16.0 m/s. If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find the final speed of both vehicles after the

    asked by ashlon on November 8, 2012
  19. Physics

    Tarzan swings on a 33.0 m long vine initially inclined at an angle of 31.0◦ with the vertical. The acceleration of gravity if 9.81 m/s What is his speed at the bottom of the swing if he a) starts from rest? Answer in units of m/s b) pushes off with a

    asked by Jessica on December 7, 2016
  20. Science

    A steel ball A of mass 20.0 kg moving with a speed of 2.0 ms−1 collides with another ball B of mass 10.0 kg which is initially at rest. After the collision A moves off with a speed of 1.0 ms−1 at an angle of 30º with its original direction of motion.

    asked by Kalash on March 24, 2019
  21. physics

    An SUV with a mass of 1.80×103 kg is travelling eastbound with a speed of +15.0 m/s, while a compact car with a mass of 9.00×102 kg is travelling westbound at -15.0 m/s. The vehicles collide head-on and stick together. What is the speed of the wreck

    asked by cindy on July 29, 2013
  22. Physics

    a pilot must fly a destination 520 km away in a direction of N30 degree E. The air speed of the plane is 320Km and the wind speed is 85 km/h E20 degree Suth. Find the heading of the plane and the time for the trop.

    asked by Jessica on October 4, 2009
  23. physics

    a ball is thrown vertically upward with a speed 25.0m/s (a)How high does it rise? (b)How long does it take to reach its highes point? (c)How long does it take to hit the ground after it reaches its highest point? (d)What is its speed when it returns to the

    asked by Anonymous on September 12, 2007
  24. Math

    A pilot of a single engine airplane flies at a constant speed of 200 km/h at a bearing of 25 degree north east there is 40 km/h crosswind blowing south east 45 degree what are plane's actual speed and direction ?

    asked by Vian on September 29, 2013
  25. sc

    A car is moving on a straight road due north with a uniform speed of 50km/hour when it left through 90degree if the speed remains unchanged after turning the change in velocity of the car in turning process is

    asked by alia on April 27, 2016
  26. physics

    A 601-kg car stopped at an intersection is rear-ended by a 1660-kg truck moving with a speed of 14.5 m/s. If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find the final speed of both vehicles after the

    asked by stoic-rider77 on November 2, 2012
  27. Physics

    A truck of mass 8,000 kg is traveling along a level road at an initial speed of 25 m/s. The driver then shifts into neutral so that the truck is coasting, and the truck gradually slows to a final speed of 13 m/s. (a) Find the total work done on the truck.

    asked by Chelsea on September 28, 2013
  28. physics

    Suppose a stone is thrown at an angle of 30 degrees below the horizontal, if it strikes the ground 57m away, find (a)the time of flight, (b)the initial speed, and (c) the speed and the angle of the velocity vector with respect to the horizontal impact.

    asked by Gail on October 16, 2011
  29. mathematics

    a boat travels 12 km upstream and back in 1 hour and 45 min.if the speed of the current is 3 km/h throughout,find the speed of the boat in still water,giving your answer correct to 3 decimal place. NOTE:(Answer is 14.3 km/h,so can any one show me the

    asked by alyshan on September 3, 2008
  30. College Physics

    A truck moving north at a speed of 70 km/h. The exhaust pipe on top sends out a trail of smoke that makes a 20 degree angle east of south. If the wind is blowing toward the east. What is the wind speed at that location?

    asked by Tim on February 10, 2016
  31. MATH

    Bob drove to the store( a distance fo 10.5) miles at ana average speed of 35 mile per hours. On the way home, he got stuck in traffic, and he only averaged 15 miles per hour along the same route. What was his average speed for the round trip ?

    asked by Anonymous on September 20, 2013
  32. Physics

    A truck on a straight road starts from rest and accelerates at 3.0 m/s2 until it reaches a speed of 18.1 m/s. Then the truck travels for 24.5 s at constant speed until the brakes are applied, stopping the truck in a uniform manner in an additional 5.7 s.

    asked by Kelsey on September 10, 2013
  33. Physics

    Hail forms high in the atmosphere and can be accelerated to a high speed before it reaches the ground. Estimate the terminal speed of a spherical hailstone that has a diameter of 2.8 cm. Hint: The mass of a piece of hail that has a volume of 1 cm3 is about

    asked by Kirsten on January 23, 2016
  34. Science collage

    A jetliner lands at speed of 210 km/h and breaks at rate of 20 km/h/s . If the jatliner travels at a constant speed of 210 km/h for 1s after landing before applying the breakes . What is the total displacement of the jetliner between couchdown on the

    asked by Aisha on January 4, 2012
  35. Physics

    A mechanic pushes a 2.60 103-kg car from rest to a speed of v, doing 5,000 J of work in the process. During this time, the car moves 21.0 m. Neglecting friction between car and road, find each of the following. (a) the speed v? (b) the horizontal force

    asked by Abdalla A. on May 7, 2013
  36. phys

    A mechanic pushes a 2.0 103 kg car from rest to a speed of v, doing 5350 J of work in the process. During this time, the car moves 29.0 m. Neglecting friction between car and road, find each of the following. (a) the speed v m/s (b) the horizontal force

    asked by hpj on October 27, 2010
  37. Physics

    A 821-kg car stopped at an intersection is rear-ended by a 1810-kg truck moving with a speed of 11.5 m/s. If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find the final speed of both vehicles after the

    asked by Daniel on November 19, 2011
  38. Physics

    A 821-kg car stopped at an intersection is rear-ended by a 1810-kg truck moving with a speed of 11.5 m/s. If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find the final speed of both vehicles after the

    asked by Daniel on November 19, 2011
  39. NEED HELP!! ALGEBRA

    A motorboat can maintain a constant speed of 26 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 35 minutes; the return trip takes 17 minutes. What is the speed of the river current?

    asked by Sandi on September 9, 2012
  40. calc 3

    A woman walks due west on the deck of a ship at 4 mi/h. The ship is moving north at a speed of 15 mi/h. Find the speed and direction of the woman relative to the surface of the water. (Round your answers to one decimal place.)

    asked by abby on September 1, 2012
  41. Physics Help

    A projectile is fired at an upward angle of 60 degrees with a speed of 100m/s. It lands on a plateau 150m higher. What is the projectile's speed the moment before it strikes the plateau? I'm thinking to just use the kinematic equation Vf^2= Vi^2 + 2aΔy.

    asked by George on December 13, 2015
  42. Physics

    A mechanic pushes a 2.60 103-kg car from rest to a speed of v, doing 5,000 J of work in the process. During this time, the car moves 21.0 m. Neglecting friction between car and road, find each of the following. (a) the speed v? (b) the horizontal force

    asked by Abdul A. on May 3, 2013
  43. Physics

    An airplane has an effective wing surface area of 17 m2 that is generating the lift force. In level flight the air speed over the top of the wings is 63.9 m/s, while the air speed beneath the wings is 58.0 m/s. What is the weight of the plane? Answer in N

    asked by Jessica on December 8, 2012
  44. Physics

    1. A train traveling at a speed of 110km/h decelerates for 20 seconds. During that time it travels 450 meters. A) What is the acceleration? = m/s^2 B) What is its speed after deceleration? = km/h Initial velocity (u) = 110km/h Time (t) = 20s Distance =

    asked by Danny on June 7, 2013
  45. Algebra

    A motorboat can maintain a constant speed of 26 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 35 minutes; the return trip takes 17 minutes. What is the speed of the river current?

    asked by Sandi on September 8, 2012
  46. Physic Please help

    A river has a steady speed of 0.276 m/s. A student swims upstream a distance of 1.4 km and swims back to the starting point. If the student can swim at a speed of 1.15 m/s in still water, how long (in minutes) does the trip take? How do I solve this

    asked by Luke James on September 8, 2012
  47. Literacy 4

    Please check my work. Thank you. 1. Government documents in a library are classified according to which of the following schemes? A. Superintendent of Documents B. Government Printing Office C. Dewe Decimal D. Library Of Congress Answer #1 is A 2. You're

    asked by Jen on August 26, 2011
  48. DISPLACEMENT and VELOCITY

    A turtle moves 3.5m [E] in 136 s and then moves 1.7m [W] in 88 s. a) What is the average speed of the turtle? b) What is the average velocity of the turtle? average speed: D/T = 3.5m + 1.7m = 5.2m/ 224s = 0.024m/s average velocity:?????????? Have I

    asked by Anonymous on November 14, 2010
  49. Algebra

    If a plane can travel 500 miles per hour with the wind 400 miles per hour against the wind, find the speed of the plane without a wind and the speed of the wind? What is the speed of the plane in still air?

    asked by rangel on March 24, 2012
  50. physics

    A 0.1kg ball dropped on the floor hits with a speed of 4.0m/s and rebounds at a speed of 3.8m/s. Calculate the impulse delivered to the ball by the floor.

    asked by taryn on October 2, 2012
  51. physics

    A woman with a mass of 56 kg runs at a speed of 8 m/s and jumps onto a giant 30 kg skateboard initially at rest. What is the combined speed of the woman and the skateboard?

    asked by brett on February 11, 2012
  52. physics

    The speed of radio waves is 3*10^8m/s, the same as the speed of light. If a spacecraft transmits a radio signal with frequency 3*10^9Hz, what is the wavelength of those waves?

    asked by AAA on February 2, 2012
  53. math

    Donna drove half the distance of a trip at 40 mi/h. At what speed would she have to drive for the rest of the distance so that the average speed for the entire trip would be 45 mi/h?

    asked by Anna Leigh on January 20, 2011
  54. AP Physics

    A transverse wave is traveling with a speed of 500 m/s on a horizontal string. If the tension in the string is increased by a factor of 2, what is the speed of the wave?

    asked by James on February 9, 2011
  55. physics

    a car is moving at speed of 50km/hr ,can be stopped by brake at least at 6 m.If the same car is moving at speed of 100 km/hr ,what is the minimum stopping distance?

    asked by priya on March 14, 2015
  56. PHYSICS

    A wheel of radius 1.5 m rotates at a uniform speed. If a point on the rim of the wheel has a central acceleration of 1.5 m/s ^2. what is the point's tangential speed?

    asked by Princess Blabla on September 12, 2015
  57. Physics

    A projectile is launched vertically from the surface of the Moon with an initial speed of 1500. At what altitude is the projectile's speed one-half its initial value?

    asked by Turk on April 28, 2012
  58. Maths

    Two missiles, 2420 km apart, are launched at the same time and are headed towards each other. They pass after 1.5 hours. The average speed of one missile is twice that of the other. What is the average speed of each missile?

    asked by Jay on August 4, 2017
  59. physics

    a car moving with a speed of 50 km/hr can be spotted by breaks after at least 6m.If the same car is moving with a speed of 100km/hr the minimum stopping distance is? With solution

    asked by Anonymous on August 11, 2016
  60. math

    A driver can travel 54 km at a constant speed. If he drives 3 km/h faster, he would have saved 3 km/h faster, he would have saved 3 hours. Let x be the speed of him originally, find the value of x.

    asked by nana on August 24, 2018
  61. physics

    A professional golfer can hit a ball with a speed of 70 m/s. What is the maximum distance a golf ball hit with this speed could travel on Mars, where the value of g is 3.71 m/s^2?

    asked by Anonymous on September 18, 2013
  62. math

    A driver can travel 54 km at a constant speed. If he drives 3 km/h faster, he would have saved 3 km/h faster, he would have saved 3 hours. Let x be the speed of him originally, find the value of x.

    asked by nana on August 24, 2018
  63. math

    Mona is skating at a speed of 300 feet per minute. Lina is 1000 feet behind her. What should be her speed if she wants to catch up with Mona in 10 minutes?

    asked by jeff penner on March 2, 2017
  64. physics

    A jet plane is traveling at a constant speed in a straight line in level speed. What does this tell you about the forces acting on it, what forces are acting on it .

    asked by Melissa on March 25, 2012
  65. Physics

    A rock is thrown off a cliff with a vertical speed of 53 m/s upward and a horizontal speed of 30 m/s. A) what will these speeds Vx and Vy, be 4 seconds later? B) what will be the x and y displacements of the rock be 4 seconds later?

    asked by Beth on October 14, 2016
  66. physics

    A billiard ball of mass m = 0.250 kg hits the cushion of a billiard table at an angle of θ1 = 70.0° at a speed of v1 = 2.50 m/s. It bounces off at an angle of θ2 = 63.0° and a speed of v2 = 2.10 m/s.

    asked by Anonymous on April 2, 2014
  67. Physics

    At a certain time a particle had a speed of 17 m/s in the positive x direction, and 2.0 s later its speed was 32 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.0 s interval?

    asked by Rachel on January 28, 2013
  68. Physics

    At a certain time a particle had a speed of 17 m/s in the positive x direction, and 2.0 s later its speed was 32 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.0 s interval?

    asked by Rachel on January 28, 2013
  69. science

    A 2.1-kg brick is placed gently upon a 2.9-kg cart originally moving with a speed of 26 cm/s. Determine the post-collision speed of the combination of brick and cart.

    asked by bizzle on April 3, 2014
  70. Physics

    A motorboat travels at a speed of 40 km/h relative to the surface of the water. If it travels upstream against a current of 12 km/h what is the boats speed relative to the shore?

    asked by aj on April 15, 2011
  71. physics

    A boat is wrecked by waves of speed 30m/s whose successive crest are 10m apart. Calculate the speed at which the boat receives the waves.

    asked by nuel on October 5, 2016
  72. physics

    A speed bike tops a hill at 3.5 m/s and accelerates steadily down hill reaching a speed of 11.4 m/s after 4.2 seconds. How far did the bike travel during this period?

    asked by lloyd on June 4, 2012
  73. Physics

    A horizontal pipe has a part with a diameter 1/3 of the rest of the pipe. If v is the speed of the fluid in the wider section, then the speed in the narrower section is:

    asked by JuliePham on May 2, 2016
  74. algebra

    a boat goes 16 Km upstream and 24 Km downstream in 6hrs.it can go 12Km upstream and 36 Km in same time.find the speed of boat in still water and speed of the stream

    asked by sara on September 5, 2010
  75. physics

    a fish vertically up towards the surface of water with speed 3m/s observes a bird diving vertically down towards it with speed 9m/s.what is the actual velocity of bird?

    asked by sameeksha on August 22, 2011
  76. Physics

    A ball is thrown toward a cliff of height h with a speed of 31 m/s and an angle of 60∘ above horizontal. It lands on the edge of the cliff 3.4 s later. What is the ball's impact speed?

    asked by Evan on October 12, 2016
  77. physics

    A woman with a mass of 41 kg runs at a speed of 7 m/s and jumps onto a giant 30 kg skateboard initially at rest. What is the combined speed of the woman and the skateboard?

    asked by megan on September 26, 2012
  78. Science

    A train travelling north at a speed of 50km/h and another train travelling in the same direction at a speed of 8km/h.Calculate the resultant velocity.

    asked by Kago Koonne on January 30, 2017
  79. Physics

    Two satellites S1 and S2 orbit around a planet P in circular orbits of radii r1 = 5.25 106 m, and r2 = 8.60 106 m respectively. If the speed of the first satellite S1 is 1.65 104 m/s, what is the speed of the second satellite S2? m/s

    asked by Young on October 22, 2017
  80. physics

    we know that the speed of light in a vacuum is 3.0 x 10^8 m/s (18,000 mi/sec). If light travels through thick plastic with a speed of 1.75 x 10^8 m/s, what is the index of refraction through plastic?

    asked by Jenna on October 24, 2011
  81. physics

    we know that the speed of light in a vacuum is 3.0 x 10^8 m/s (18,000 mi/sec). If light travels through thick plastic with a speed of 1.75 x 10^8 m/s, what is the index of refraction through plastic?

    asked by Jenna on October 24, 2011
  82. AP Physics

    A person on a trampoline bounces straight upward with an initial speed of 4.7m/s . What is the magnitude of the person's speed when she returns to her initial height?

    asked by Vova on August 17, 2011
  83. AP Physics

    A person on a trampoline bounces straight upward with an initial speed of 4.7m/s . What is the magnitude of the person's speed when she returns to her initial height?

    asked by Vova on August 17, 2011
  84. General Physics I

    An antelope moving with constant acceleration covers the distance between two points 70.0 m apart in 7.00 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first point? (b) What is its acceleration?

    asked by Anonymous on October 12, 2010
  85. AP Physics

    A person on a trampoline bounces straight upward with an initial speed of 4.7m/s . What is the magnitude of the person's speed when she returns to her initial height?

    asked by Vova on August 17, 2011
  86. physics

    A projectile is launched vertically from the surface of the Moon with an initial speed of 1210 m/s. At what altitude is the projectile's speed two-fifths its initial value?

    asked by Cam on April 25, 2014
  87. Physics

    A transverse wave is traveling with a speed of 500 m/s on a horizontal string. If the tension in the string is increased by a factor of 2, what is the speed of the wave?

    asked by help please on February 10, 2011
  88. Physics

    A distant planet has a mass of 0.6400 ME and a radius of 0.9000 RE. What is the ratio of the escape speed from this planet to the escape speed from the earth?

    asked by Ann on November 20, 2014
  89. Math

    A train travels at an average speed of 15 m/s. a) Express its average speed in km/h b) Find the time in sec taken by the train to travel 750m

    asked by Tanto on September 9, 2016
  90. physics

    An antelope moving with constant acceleration covers the distance between two points 70.0 m apart in 7.00 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first point? (b) What is its acceleration?

    asked by anjo on April 25, 2012
  91. Physics

    A distant planet has a mass of 0.6400 ME and a radius of 0.9000 RE. What is the ratio of the escape speed from this planet to the escape speed from the earth?

    asked by Ann on November 21, 2014
  92. physics

    A spring gun shoots out a plastic ball at speed v0. If the ball's speed is increased by a factor of 2, what distance must the spring have been compressed?

    asked by Kevin on November 18, 2016
  93. Physics

    At a certain time a particle had a speed of 16 m/s in the positive x direction, and 2.2 s later its speed was 30 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.2 s interval?

    asked by Patricia on January 27, 2013
  94. Physics

    A projectile is launched vertically from the surface of the Moon with an initial speed of 1130 m/s. At what altitude is the projectile's speed three-fourths its initial value?

    asked by Emily on November 15, 2009
  95. Physics

    At a certain time a particle had a speed of 16 m/s in the positive x direction, and 2.2 s later its speed was 30 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.2 s interval?

    asked by Patricia on January 27, 2013
  96. Physics

    A spring gun shoots out a plastic ball at speed v0. If the ball's speed is increased by a factor of 5, what distance must the spring have been compressed?

    asked by First Name on November 16, 2016
  97. algebra

    a boat goes 16 Km upstream and 24 Km downstream in 6hrs.it can go 12Km upstream and 36 Km in same time.find the speed of boat in still water and speed of the stream

    asked by sara on September 5, 2010
  98. physics

    A transverse wave is traveling with a speed of 500 m/s on a horizontal string. If the tension in the string is increased by a factor of 2, what is the speed of the wave?

    asked by help please on February 10, 2011
  99. Structural design part 2

    The structual technique that includes long vertical studs running from the sill plate to the second floor rppf frame is called_____framing. A.platform B.vertical C.balloon D.post Bulging of exterior walls usually results in. A.sagging of windows B.a rise

    asked by sib on September 14, 2010
  100. English

    1. Solar energy will never give out. 2. Solar energy will never run out. (Are both the same?) 3. We bought many foods. 4. We bought much food. (Which one is right? Are both OK? Is food a material noun, a common noun or a collective noun? In dictionaries,

    asked by rfvv on May 24, 2010

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