1. Physics

    Three forces act on the object.A 3- N force acts due west, and 4-N force acts due south.If the net force on the object is zero ,what is the magnitude of the third force
  2. physics

    Bob has a helicopter and from the launch pad he flies the following path. First he travels from the launch pad a distance of 33 kilometers at heading 10 degrees West of North. Then he flies 18 kilometers heading 45 degrees East of South. After this he flies 14 kilometers ...
  3. Physics

    The potential difference between a storm cloud and the ground is 2.13 × 108 V. If a bolt carrying 2 C falls from a cloud to Earth, what is the magnitude of the change of potential energy of the charge? Answer in units of J.
  4. Physics

    Two men decide to use their cars to pull a truck stuck in mud. They attach ropes and one pulls with a force of 972 N at an angle of 28 degrees with respect to the direction in which the truck is headed, while the other car pulls with a force of 1401 N at an angle of 23 degrees...
  5. Physics

    Three Point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of an equilateral triangle. As the drawing shows(a) The charge at any one corner experiences forces from the charges at the other corners. Do the individual ...
  6. science

    A pipe of diameter 80mm is fitted with a branch section into which fit two pipes of equal diameter. If it is desired that the velocity remain constant throughout, determine the required diameter of each of the branch pipes.
  7. physics

    The physics of electric field between two charges. What is the magnitude and direction of the electric field at a point midway between a -8.0 ìC charge and a +6.0 ìC charge? The -8.0 ìC charge is 4.0 cm to the left of the +6.0 ìC charge. If a charge of -2.0 ìC was placed ...
  8. Physics

    A disk of radius 0.4 cm and mass 0.7 kg is rotating at 5 rad/s. A second disk of radius 0.5 cm and mass 0.85 kg is rotating at 6 rad/s in the other direction. What is the combined angular velocity of the disks when the second disk is placed on top of the first? Should I add up...
  9. Chemistry

    Consider a chromium-silver voltaic cell that is constructed such that one half-cell consists of the chromium, Cr, electrode immersed in a Cr(NO3)3 solution, and the other half-cell consists of the silver, Ag, electrode immersed in a AgNO3 solution. The two electrodes are ...
  10. Social Studies

    How did improvements in transportation, communication, farming, and manufacturing affect the economy of the North? Break down your answer by providing an example of advancement in each of the four areas. Then discuss how that improvement led to changes in the North’s economy...
  11. Chemistry

    When hydrochloric acid (HCl) is added to water it dissociates to form H3O+ (aq) and Cl− (aq) as shown below. HCl (aq) + H2O (l) → H3O+ (aq) + Cl− (aq) What happened to the electrons in the H-Cl bond? Choose the best answer. The electrons are transferred to ...
  12. Goverment junior secondary school kwanpe(G.J.S.S K.)

    Find the angle between two forces P,Q which has 30N and 27 respectively if the magnitude of the resultant force is 38N
  13. geometry

    You have looked at it two times before. There are 30 questions worth 30 points. Part 1 Multiple Choice: Select the best answer from the choices provided. (Each question is worth one point) 1. Determine how many wheels are turning clockwise. 1 2 none 2. Determine how many ...
  14. Chemistry

    Two iron bolts, one at 100. °C with a mass of 52.8g, the other at 56.0°C with a mass of 66.8g, are placed in an insulated container. Assuming the heat capacity of the container is negligible, what is the final Celsius temperature inside the container (c of iron = 0.450 J/g·K)?
  15. more physics

    a 1.00-kg object is observed to accelerate at 10.0m/s∧2 in a direction 30.0 north of east. the force F2 acting on the object has magnitude 5.00 N and is directed north. determine the magnitude and direction of the force F1 acting on the object.
  16. physics

    On planet x, an object weighs 10.4N. On planet B where the magnitude of the free fall acceleration is 1.48g (where g=9.8 m/s^2 is the gravitational acceleration on Earth),the object weighs 24.6N. The acceleration of gravity is 9.8 m/s^2. What is the mass of the object on Earth...
  17. word problem

    12 is divided into two parts such that the product of the square of one part and fourth power of the other give a maximum,find the two numba
  18. physics

    Three blocks are in contact with each other on a frictionless horizontal surface. A 696 N horizontal force is applied to the block with mass of 4.7 kg as shown in the figure below. The acceleration of gravity is 9.8 m/s 2 . 4.7 kg 5.5 kg 7.1 kg F a) What is the net force...
  19. science

    3 charges are arranged along the x-axis. q1 = -4.50 nC is located at x = 0.200m q2 = +2.50 nC is located at x = -0.300m q3 = is a positive character located at the origin. What is the value of q3 for the net eletric force on it to be 4*10^-6 N? I found the charge on q3 to be...
  20. Physics

    At a given temperature, what relationship appears to exist between a gas particle's mass and it speed? How does graph change as particle mass increase? Isra fills two identical balloons at identical temperatures. She fills one with O2 gas and the other with O3 gas. Which ...
  21. Physic

    Two blocks, m1 = 4 kg and m2 = 2 kg, are in contact with each other and are on a horizontal surface for which the coefficient of kinetic friction is 0.1. A 34 N horizontal force acts on block 1, making both blocks move in the direction of block 2. 34N --> (m1)(m2) --> ...
  22. Earth Science

    I'm doing a crossword and cannot figure this last one out. The clue for it is: Application of scientific discoveries. It has 10 letters, the 5th letter is an N and the 10th letter is a Y.
  23. math

    One estimate for the distance from earth to the andromeda galaxy is 2,400,000 light years. What is this distance expressed in scientigic notation?
  24. Science

    Describe the geomorphic processes that shape the Earth’s surface. Use the Yosemite Valley to explain one or more of those processes.
  25. world geography

    Where on Earth? which of the 12 northern eurasian cities will be the home of your company's newest restaurant? hint: use information from an atlas and al almanac to eliminate all but one city
  26. Physics

    How much faster would a person be moving if they stood on top of a 18.2 m high building compared to the ground? Take the period to be one day, and the radius of the earth to be 6400 km?
  27. math

    two sides of a triangle are given.find the angle between these two sides so that area of the triangle is maximum?
  28. Physics

    Two strong magnets on opposite sides of a small table are shown. The long-range attractive force between the magnets keeps the lower magnet in place. Suppose the weight of the table is 26.1 N, the weight of each magnet is 8.99 N, and the magnetic force on the lower magnet is 2...
  29. History

    1. Read the paragraph, which may contain errors or false beliefs about the Civil War: Maryland was an important state in the Civil War. Due to its location, it was the key to the North maintaining control of its capital, Washington, D.C. Maryland formed the east and north ...
  30. physics

    Two cars are on a collision course. One is going right 18 m/s and has a mass of 860kg. The other is going left at 24 m/s and has a mass of 840 kg. 1. Find the total initial momentum of the two cars For this question I did first car: 860(18) = 15480 second car: 840(-24) = -...
  31. math

    four angles are put together, forming a straight angle. two of the angles are the same size. the other two angles are also the same size but different from the other two. If one of the angles is 40 degrees, what are the measures of the other three? please explain
  32. Science

    1. groups/ family of elements are ones which: A. Have the same number of electrons in the valence/ outer engery level B. Have exactly 8 electrons in the valence shell outer energy level C. Have the same number of protons in the nucleus 2. A period represents elements which? A...
  33. physics

    Two straight and parallel wires of length 1.0 m carry a current — the first carries a current of 9.0 A while the other wire carries a current of 4.0 A. What distance must separate the two straight and parallel copper wires if the force between them is to be 6.0 × 10−6 N?
  34. Physics

    An ocean liner leaves New York City and travels 26.9 ° north of east for 217 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship's displacement vector in the directions (a) due east and (b) due north?
  35. hydraulic

    a cylinder has a 3" diameter and a 1-7/8" diameter rod with 800psi. what is the force output of the cylinder extending and retracting
  36. Math

    a light shines from the top of a pole 50ft high. a ball is dropped from the same height from a point 30 ft away from the light. how fast is the ball's shadow moving along the ground 1/2 sec later? (assume the ball falls at a distance of s=16t^2 in t sec)
  37. Physics

    3 charges are arranged along the x-axis. q1 = -4.50 nC is located at x = 0.200m q2 = +2.50 nC is located at x = -0.300m q3 = is a positive character located at the origin. What is the value of q3 for the net eletric force on it to be 4*10^-6 N? I found the charge on q3 to be...
  38. math

    How high is a tree that casts a 33 foot shadow at the same time a 6 foot pole casts a 4 foot shadow?
  39. physics induced voltage

    A Boeing 747 jet with a wingspan of 60.0 m is flying horizontally at a speed of 287 m/s over Phoenix, Arizona, at a location where the Earth's magnetic field is 50.2 µT at 58.0° below the horizontal. What voltage is generated between the wingtips?
  40. Math

    The total resistance of two circuits in parallel is 15 ohms and one circuit has five times the resistance of the other, find the resistance of each circuit. Use 1/R=1/R1+1/R2. R1 and R2 are two individual resistances. a)Find the smaller resistance b)Find the larger resistance
  41. Geography

    I need help with this: "This is a nation in South Asia. One of South Asia's three major rivers is in this country. The country has two climate regions, arid and semi-arid and the dominant religion in this country is Islam." Which country could it be? Thanks -MC
  42. Science

    Which directions do lines of latitude run and what do they measure? Which direction do meridians run and what do they measure. Lines of latitude run east to west and measure north and south of the equator. Meridians run north to south and measure east to west of the equator. ...
  43. science help PLS

    An astronomer see a star that is very far away but still very bright. What can she conclude about the star? The star must be very large. The star must be very small. The star must be moving away from Earth. The star must be moving closer to Earth.
  44. Chemistry

    You write the electron structure like this. 1s2 2s2 2p6 3s2 3p6 3d10 4s1 is the neutral Cu atom. Remove the two outside electrons to make the Cu^+2 ion. That leaves us with 3d9 as the outside and since that is an odd number, one electron must be unpaired. And you will note ...
  45. Science - Please Check my Answer

    My problem: A swimmer travels from the south end to the north end of a 30.0 m pool in 15.0 s and makes the return trip to the starting position in 19.0 s. What is the average velocity for the second half of the swim? My answer: 1.60 m/s to the south Please check! I will really...
  46. Social Studies

    1. what happened initially when the un forces went to support south Korea? A. North Korean forces were quickly overwhelmed. B. UN forces were outnumbered and poorly supplied. C. The fighting escalated beyond the Korean borders D. South Korea did not want help from the UN ...
  47. Physics

    Two forces of 2 Newton and 3 Newton act at a point so as to produce a resultant force of 4 Newton .Find: a. The angle between the directions of the 2 Newton and 3 Newton forces b.the angle between the directions of the resultant and the 3 newton force
  48. physics

    Two large circular metal plates are parallel and nearly touching, only 4.1 mm apart. The two plates are connected to the opposite terminals of a 9 V battery. (a) What is the average electric field strength in the space between the plates? V/m (b) What is the electric force on ...
  49. physics

    A ladder can fall for two reasons. If it is set too steep and the climber gets their mass to the left of the ladder's base, the ladder likely will fall over backwards. If the ladder is set at too shallow of an angle the required force of friction between the ladder and the ...
  50. science physics

    a force acted upon a body by 3 given force is under equilibrium if f1 =10n and f2 =6n find f3 and angle
  51. Calculus (Definite Integrals - Force) Please Help

    A cylindrical oil storage tank 12 feet in diameter and 17feet long is lying on its side. Suppose the tank is half full of oil weighing 85 lb per cubic foot. What's the total force on one endof the tank?
  52. earth

    4th grader needs to make a model of earths layers showing crust, mantle, and core. Any ideas? Where would I find a picture?
  53. physics

    An object is projected upward from the surface of the earth with an initial speed of 2 km/s. The acceleration of gravity is 9.81 m/s^2. Find the maximum height it reaches. Answer in units of km.
  54. math

    from the top of a vertical mast 150m high,two huts on the same ground level are observed. One due east and the other due west of the mast. Their angles of depression are 60° and 45° respectively. Find the distance between the huts. Solutuons with diagram
  55. physics

    two metra trains are on separate but parallel tracks. One has a speed of 90 km/hr, the other 80 km/hr. Initially, the two trains are 2.71 km apart. How long will it take the two trains to pass each other?
  56. Math

    My second grader brought home this math problem for which I can find no solution. The sum of two numbers is 21. One number is two more than the other. What are the two numbers?
  57. math

    A 42 inch board that's cut into two pieces. one piece is two times the length than other. Find the length of the two pieces. short and long
  58. world history

    Please check my answers. 1. Which of the following separates the Arabian Peninsula from Africa? 1.The Persian Gulf 2.The Red Sea*** 3.the Indian Ocean 4.The Mediterranean Sea 2. Why is food often used as a positive benefit of the Colombian exchange, as described in this lesson...
  59. Physics

    Three Point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of an equilateral triangle. As the drawing shows(a) The charge at any one corner experiences forces from the charges at the other corners. Do the individual ...
  60. Maths Algebra

    Mass of Earth is (5.97×10^24)kg and Mass of Moon is (7.35×10^22)kg.What is the Total mass of the two?
  61. physics

    A piston, A, as shown below, has a diameter of 0.54 cm. A second piston, B has a diameter of 3.8 cm. Determine the force, F, necessary to support the 500.0 N weight in the absence of friction.
  62. Single Room, Earth View by Sally Ride--Help!

    This regards the story "Single Room, Earth View" by Sally Ride. Choose one of the following quotations; then in a few paragraphs, discuss how Sally Ride's observations support or refute the quotation. Quotations: 1. "Observation is a passive science, experimentation is an ...
  63. Chemistry - Periodic Trends

    For the isoelectronic series S2-, Cl-, Ar, K+, and Sc3+, which species requires the least energy to remove an outer electron? thanks They all have the same number of electrons (40) in the same shell arrangements, but S(2-) has the least nuclear charge. That should be a clue. ...
  64. physics

    A passenger on a ride at the firemen's field days sits in a chair and is swung around at the end of a cable connected to a central tower. At full speed, the cable makes an angle of 56 degree with the vertical, and the chair is 46 m from the pole. What is the speed of the ...
  65. Math

    In a study, info about 224 amphora was gathered. The locations where the amphora were found were recorded as, north, south or elsewhere. Also the positions in which the amphora were found was recorded as layer, pit or other. I need to state the null and alternative hypothesis ...
  66. Science

    Which of the rock-forming mineral groups makes up the largest group of minerals in the Earth's crust? Look here for your answer. http://www.google.com/search?hl=en&lr=&ie=ISO-8859-1&q=minerals+earth%27s+crust&btnG=Search http://en.wikipedia.org/wiki/Silicate_minerals I don't Know
  67. chemistry

    The following describes the process of an atom emitting light. Place the steps in order: (I already know the first two steps are: 1. Energy is absorbed by electrons and excitation occurs and 2. Electrons move from the ground state to the excited state.) Electrons are unstable ...
  68. Physics

    In a tug-of-war between two athletes, each pulls on the rope with a force of 365 N. What is the absolute value of the horizontal force that each athlete exert against the ground?
  69. Chemistry

    About twenty radioisotopes with ultra-long half-lives, from 82 million years (244- Plutonium) to 6 million billion years (50-Vanadium) are found in the earth’s crust, yet no radioisotopes with half-lives less than 70 million years (146- Samarium) are found. Why not? Use this...
  70. physic

    A cross- country skier skis 7.40km in the direction of 45⁰ East of South, then 2.8 km in the direction 30⁰ North of East, and finally 5.2km in the direction 22⁰ West of North. How far is the shier from the starting point?
  71. Maths

    The sum of two numbers is 21 .two-thirds of one number is added to three-quarters of the other number to give 15 .find the two numbers,showing clearly your workings.
  72. Marh

    A solid sphere of diameter 18cm is placed in an empty vertical cylindrical tank of diameter 24cm enough water is poured into the tank to cover the sphere if the sphere is then removed how far does the water fall
  73. English

    1. I saw two movies: one was a scary movie and the other was a comedy. 2. I saw two movies: one was a scary movie and the other was a comedy movie. ------------------ Q1: Does #1 mean #2? Q2: Can we use 'horror movie' instead of 'scary movie'? What is the difference between '...
  74. Physics

    A cube of mass M=0.703 kg is placed on an incline and given a push. It slides down, and its speed down the incline is measured at two positions, [1] and [2] on the diagram below, with V1 = 0.923 m/s and V2 = 1.207 m/s. Note that the incline passes through at least two grid ...
  75. Physics

    A. You drag a suitcase of mass 19 kg with a force of F at an angle 41.3 degrees with respect to the horizontal along a surface with kinetic coefficient of friction 0.54. The acceleration due to gravity is 9.8 m/s^2. What is the normal force on the suitcase? Answer in units of ...
  76. physics

    A 500g trolly is placed on a runway that is tilted so that it makes an angle of 30 degrees to a horizontal table.A light inextensible string is attached to 150g mass piece.the trolly accelerates down the slope as a result of the force applied by the hanging mass piece.the ...
  77. Physics

    An ocean liner leaves New York City and travels 25.1 degrees north of east for 110km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ships displacement vector in the directions, a) due east and b) due north
  78. Math

    Product of two no is -6/7 if one no is 28/5 find the other no
  79. English

    Question: In lesson plan, we can see two items; one is 'Registration Number' and the other is 'Identity Number.' What is the difference between them. -- Two or three applcants for teaching at school will come and start teaching for demonstration for about 10 minutes. --
  80. maths/physics

    Please I need some help with this question A cicular opaque disk, 25cm in diameter, is set up 30 cm from a circular source of light of diameter 40 cm. A screen is placed 30cm beyond the opaque disk. Describe, giving dimensions, the nature of the shadow on the screen.
  81. geology

    1. What fraction of the Earth is made up of each of the major compositional layers: core, mantle, and crust? 2. What cities lie the same distance from our town as the boundaries of the following layers in the Earth lie from the solid surface? a.Base of oceanic crust or top of ...
  82. Physics/Astronomy

    A pulsar is a stellar object that emits light in short bursts. Suppose a pulsar with a speed of 0.975c approaches Earth, and a rocket with a speed of 0.999c heads toward the pulsar (both speeds measured in Earth’s frame of reference). If the pulsar emits 20.0 pulses per ...
  83. physics

    A ball is let fall from a hight h0.There are n collisions with the earth . If the velocity of rebound after n collisions is vn and the ball rises to a hight hn , then coefficient of restitution e is given by ,
  84. Physics

    Two charged Ping-Pong balls separated by a distance of 1.20 m exert an electric force of 0.0300 N on each other. What will be the force if the objects are brought closer, to a separation of only 30.0 cm? _____N
  85. prealgebra

    please help me to find the diameter and the radius of a circle with the given circumference of 2 mi.
  86. physics

    A L=3 mile long conducting cable tethers a satellite to the International Space Station. The Cable moves through the Earth' magnetic field of about B=0.02 Gauss at a speed of v=8 km/sec. The cable points radially from the Space Station to the satellite. The ISS moves Eastwards...
  87. just curious

    why is the equator hotter than the north and south poles?
  88. U.S. History

    Who benefitted more from the compromise of 1850, the north or south?
  89. math

    a boy travels 20 km north, then 15 km south, how far is he from where he started?
  90. Social Studies

    Why was the South so much less industrial than the North?
  91. information u.s. history

    people and economy in the north and south in 1850s
  92. Social Studies

    What was the effect of the Act on both the North and South.
  93. Physics

    How to solve/work problem? Two objects attract each other gravitationally with a force of 2.5 * 10^-10 N when they are .25m apart. Their total mass is 4.0kg. Find their individual masses.
  94. Physics

    A ball is thrown upward in two dimensions with an initial speed of 17 Zlugs per mega handle(made up) near the surface of the planet earth. What will be the y component of the balls velocity at the peak of its trajectory?
  95. Physics

    A ball is thrown upward in two dimensions with an initial speed of 17 Zlugs per mega handle(made up) near the surface of the planet earth. What will be the y component of the balls velocity at the peak of its trajectory?
  96. Physics

    A ball is thrown upward in two dimensions with an initial speed of 17 Zlugs per mega handle(made up) near the surface of the planet earth. What will be the y component of the balls velocity at the peak of its trajectory?
  97. Science-Earth's History

    The geologic time scale originally ordered Earth's rocks by: A. absolute age B. relative age C. composition D. decades and centuries B Where did scientists originally get their information to develop the geologic time scale? A. They collected and studied rock samples in Europe...
  98. earth science

    how do we find the mass of an object? mass=density * volume
  99. physics

    A force of 40.0N is required to pull a 10.0kg wooden block at a constant velocity across a smooth glass surface on Earth. What force would be required to pull the same wooden block across the same glass surface on the planet Jupiter.
  100. physics

    A simple Geiger counter is constructed out of a setup similar to what we just used in problem 5. A thin wire with a linear charge density _ is held in the center of a cylindrical tube, which is filled with an inert gas. When a high speed 2 particle coming from a radioactive ...
  1. Pages:
  2. 1
  3. 2
  4. 3
  5. 4
  6. 5
  7. 6
  8. 7
  9. 8
  10. 9
  11. 10
  12. 11
  13. 12
  14. 13
  15. 14
  16. 15
  17. 16
  18. 17
  19. 18
  20. 19
  21. 20
  22. 21
  23. 22
  24. 23
  25. 24
  26. 25
  27. 26
  28. 27
  29. 28
  30. 29
  31. 30
  32. 31
  33. 32
  34. 33
  35. 34
  36. 35
  37. 36
  38. 37
  39. 38
  40. 39
  41. 40
  42. 41
  43. 42
  44. 43
  45. 44
  46. 45
  47. 46
  48. 47
  49. 48
  50. 49
  51. 50
  52. 51
  53. 52
  54. 53
  55. 54
  56. 55
  57. 56
  58. 57
  59. 58
  60. 59
  61. 60
  62. 61
  63. 62
  64. 63
  65. 64
  66. 65
  67. 66
  68. 67
  69. 68
  70. 69
  71. 70
  72. 71
  73. 72
  74. 73
  75. 74
  76. 75
  77. 76
  78. 77
  79. 78
  80. 79
  81. 80
  82. 81
  83. 82
  84. 83
  85. 84
  86. 85
  87. 86
  88. 87
  89. 88
  90. 89
  91. 90
  92. 91
  93. 92
  94. 93
  95. 94
  96. 95
  97. 96
  98. 97
  99. 98
  100. 99
  101. 100