1. Calculus 3

    1. An object moves along a straight track from the point (1,−2,1) to the point (0,−7,5). The only force acting on it is a constant F=2i−3j−5k newtons. Find the work done if the distance is measured in meters. 2. A wrench 0.5 meters
  2. Mathematics

    1. Which of the following is the correct definition of minerals? (1 point) a naturally occurring, inorganic solid that has a crystal shape and a definite chemical composition a naturally occurring, inorganic solid that forms through crystallization of
  3. physics - so important

    In which of these cases is a youngster doing work in the school gymnasium? climbing up a rope lifting a set of weights from the floor to overhead PLEASE HELP ME? i NEED TO KNOW THiS FOR A TEST TOMORROW iN PHYSiCS & i CANT SEEM TO FiND THE ANSWER ANYWHERE &
  4. chem

    In the equation: 2Al+6HCl-->2AlCl3+3H2 Why is the hydrogen by itself instead of the chlorine? Al is above hydrogen in the activity series (sometimes called the electromotive force series); therefore, it replaces H. This is single replacement type
  5. two dimensional kinematics

    A jetliner with an airspeed of 1000 kmlhr sets out on a 1500 km flight due south. To maintain a southward direction, however, the plane must be pointed fifteen degrees west of south. Ifthe flight takes 1 00 min, what is the wind velocity?
  6. HS Science

    I have 4 questions 1 What is the equation for the acid ionization constant of HI? 2 Give the oxidation numbers of all atoms in NaMnO4 3 An atom changes its oxidation number from -2 to -5. Is it oxidized or reduced? How many electrons did it take to do
  7. Pre-Calc (Please my class starts in an hour!! :)

    Can someone please help me with the following question. 1) The weight of an object above Earth can be modeled by a function of the form w(h)=(r/r+h)^2*"w , where r is the radius of Earth 0" (approximately 3950 miles)," h" is the distance above Earth's
  8. Math

    A plane flys 230 km due north. The wind is blowing west at 85 km. what direction is the plane flying. Calculate the actual speed of the plane. What is the hearing from North?
  9. Math

    A plane flys 230 km due north. The wind is blowing west at 85 km. what direction is the plane flying. Calculate the actual speed of the plane. What is the hearing from North?
  10. physics - please help

    Assume the earth is a uniform sphere and that its path around the sun is curcular. Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the US in one year is about 9.33 x 10^9
  11. physics

    The figure below shows a test charge q between the two positive charges. Find the force (in newtons) on the test charge for q = 1 µC. Give a positive answer if the force is to the right and a negative answer if the force is to the left.
  12. English

    Which of the following italicized words is correctly capitalized? I think it is D. is that correct? Thanks or your help.. A. Mount mckinley is the tallest mountain in North America. B. The most beautiful State is Hawaii. C. Marsha speaks excellent german.
  13. physics

    A 2,000-kg car moving east at 10.0 m/s collides with a 3,000-kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 39.0° north of east and at a speed of 5.15 m/s. Find the speed of the 3,000-kg car before the
  14. Physics

    A 50g mass (M1) will be attached to the trolley M2) and will cause it to accelerate a distance of between .5 to .6m. You also catch the trolley immediately after it has passed through the photogate. The time for the trip will be noted and recorded. The
  15. Chem answer check

    Do these look right? What shape does an ammonia (NH3) molecule have?trigonal pyramidal In a tetrahedral molecule, how many unshared pairs of valence electrons does the central atom have? none In a polar bond, electrons are? completely transferred What
  16. South America

    What is the longitude and latitude of every piece of south America?
  17. Math

    It takes 5 1/3 minutes for light from the sun to reach earth. The Moon is closer to earth, so it,s light reaches earth faster about 5 19/60 minutes faster than from the sun. How long does light from the moon take to reach earth.
  18. English

    1. The second seed came out of the earth. 2. The second seed came out of the Earth. (Which one is correct? Do I have to use 'earth' or 'Earth'?) 3. I felt to get up early. 3-1. I felt getting up early. 3-2. I felt like getting up early. 3-3. I felt that I
  19. Algebra

    2. The following formula relates three quantities: Force (F), mass (m), and acceleration (a). F = ma a. Solve this equation for a. b. If the force is F = –25 units and the mass is m = 10 units, find the acceleration, a. c. If the force is F = 25 units
  20. Calculus/Physics

    A spring has a natural length of 10in. An 800lb force stretches the spring to 14in. A. Find the force constant B. How much work is done in stretching the spring from 10 to 12 inches? C. How far beyond its natural length will a 1600lb force stretch the
  21. Physics

    A 115.0 kg box is pushed by a horizontal force F at constant speed up a frictionless ramp which makes an angle of 46.0 deg with the horizontal. Find the magnitude of the applied force F. what is the magnitude of the normal force between the ramp and the
  22. physics

    An electronic tracking device is placed on a police dog to monitor its whereabouts relative to the police station. At time t1 = 23 minutes, the dogs placement from the station is 1.2km, 33 degrees north of east. At time t2=57 minutes, the dog's
  23. Physics

    A nail on a vertical wall is pulled by means of a chord attached to its head if the chord makes an angle of 60deg to the horizontal and it exact a force of 80N on the nail find the effective force which tends to pull the nail out of the wall and the force
  24. History

    Can someone please help me? Thanks Select one way World War II changed the roles of women or blacks in the United States and South Carolina. Explain the change you selected. Provide examples of how these events changed South Carolina’s society.
  25. Math

    a small plane flies due south with a speed of 112 m/s while a tailwind blows due south at 31 m/s. Draw and label a vector diagram and calculate the magnitude and direction of the plane's resultant velocity
  26. Life orientation

    Identify one evironmental or human factor that causes ill health, accidents and disasters in south africa? *in 10-15 lines critically discuss 5 ways in which the human or environmental problem impacts in south africa.
  27. Physics

    I have two questions: How many hours of light and darkness are there in June at regions south of the Antartic Circle (dotted line in Southern Hemisphere)? Six months later, when the earth is at the December position, is the situation in the Antartic the
  28. Physics!!!!

    Assume that a scale is in an elevator on the earth. What force would the scale exert on a 53 kg person standing on it when the elevator slows at 1.77 m/s2 while moving upward?
  29. Physics

    2. Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth’s mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth. Show your work. Answer: g= GM/r² G= 6.67 * 10^-11 Nm²/kg² ME= 5.98 * 10^24
  30. physics

    A uniform 5.9 T magnetic field points north. If an electron moves vertically downward (toward the ground) with a speed of 0.85 × 107 m/s through this field. The charge on a proton is 1.60×10−19 . a) What is the magnitude of the force
  31. physics

    A uniform magnetic field points North; its magnitude is 1.5 T. A proton with kinetic energy 8.0x10–13 J (5.0 MeV) is moving vertically downward in this field. What is the magnetic force acting on it? I have no idea where to start with this question, can
  32. science

    The words in the bank are air resistance,time, zero, inertia, mass, direction, friction, rolling friction, and less. See if I did them right and if I didn't write anything on the blank, I need help with it. THANKS!!!!!!!!!!!!!!!! 10. Speed can be
  33. physics helppp!

    The coeffcient of friction between the 7.9 kg mass and the table is 0.55, and the coeffcient of friction between the 5 kg mass and the table is 0.38. Consider the motion of the 37 kg mass which descends by the amount of y = 0.45m after releasing the system
  34. repost chem

    or the compound: carbon in the middle with 3 bonds -double bond to oxygen -bond to Mn(CO)5 -bond to CH3 group is the oxidation state of the metal +1? d count 6? total electron count 20? coordination number 7? D COUNT is electrons in the d orbital, and i
  35. physics

    A ship leaves the island of Guam and sails a distance 280 at an angle 39.0 north of west. 1.In which direction must it now head so that its resultant displacement will be 125 directly east of Guam? (Express your answer as an angle measured south of east)
  36. Civic

    Expalin how the relationship between the north American colonists and great britiain affected the development of the undderiyin priciples and idead in the decelaration of independence and new state constitutation in North american inn the eighteenth
  37. gEoMeTrY iNsCrIbEd AnGlEs MuLtIpLe ChOiCe QuEsTiOn

    A satellite, B, is 17,000 miles from the horizon of Earth. Earth’s radius is about 4,000 miles. Find the approximate distance the satellite is from the Earth’s surface. {The picture is a circle with point O in the center, point C is on the top center
  38. Physics

    A potential energy function for a two-dimensional force is of the form U = 3 x^(4)y - 8 x. Find the force that acts at the point (x, y). (Use x and y as appropriate.) I know its something about partial derivatives but I'm not sure how to go about it. And
  39. Physics

    ohn and Jack are planning to do a physics lab related to vectors. Starting at the door of their physics classroom, they walk 2.0 meters, south. They make a right hand turn and walk 16.0 meters, west. They turn right again and walk 24.0 meters, north. They
  40. Math

    A ship sailing west toward shore, and there are tow ports on the horizon. The ports are 17 miles apart, and from the ship's vantage point, point A is 30 deg North of straight ahead and port B is 80 deg South of straight ahead. Approximately how much
  41. physics

    because of friction, a constant force of 20 N is needed to slide a box across a room to the right at a constant speed, and box is moved 3 m. What is the friction force and how much work is done by friction force?? How much work is done by gravity? How much
  42. math

    The volume of Jupiter is about 1.43*10^15 cubic kilometers. The volume of Earth is about 1.09*10^12 cubic kilometers. The number of Earths that can fit inside Jupiter can be found by dividing Jupiter's volume by Earth's volume. Find this quotient and
  43. CHEM AP please help!!

    Why does the octet rule not hold for many compounds containing elements in the third row of the periodic table and beyond? (Select all that apply.) 1. Atoms of elements in the third period are less subject to destabilization from additional
  44. physics

    please check my answer An electron moves north at a velocity of 9.8 * 10^4 m/s and has a magnetic force of 5.6 * 10^-18 N west exerted on it. If the magnetic field points upward, what is the magnitude of the magnetic field? F=BqV F= 5.6 * 10^-18N q= 16 *
  45. Science

    According to the continental drift theory, which of the following land regions should show the greatest similarities in fossil types? (1 point) A) east coast of South America and west coast of Africa B) east coast of South and west coast of South America
  46. Physics

    A car is driven at a constant speed of 21 m/s (76km/h) down a road. The car's engine delivers 52 kW of power. Calculate the average force of friction that is resisting the motion of the car. My thinking: Convert 52 kW to 5200 W. Force of friction = force
  47. Physics

    An athlete swims from the North end to the South end of a 50.0 Meter pool in 20.0 seconds, and makes the return trip to the starting point in 20.0s A. What is the average velocity for the first half of the swim B.What is the average velocity for the
  48. plz help me in physics

    A ship leaves the island of Guam and sails a distance 295km at an angle 35.0 north of west. a:In which direction must it now head so that its resultant displacement will be 100km directly east of Guam? (Express your answer as an angle measured south of
  49. physics- i need help ASAP

    A ship leaves the island of Guam and sails a distance 265 km at an angle 41.0 north of west. ***In which direction must it now head so that its resultant displacement will be 130 km directly east of Guam? (Express your answer as an angle measured south of
  50. Science-Repost

    Describe how the rotation of Earth is responsible for the movement of the stars. The rotation of earth is responsible for the movement of stars because as it rotates, objects around it rotate as well, such as planets, they appear to move through the stars
  51. Astronomy

    A cinder block can be weightless in space. Would you want to kick it with your bare foot? Even If it is weightless, does it have mass? An astronaut, circling the earth in the Space Shuttle, senses that his apparent weight is zero. He cannot feel the normal
  52. algebra

    A man goes 3 km north and 4 km east.Find how far away is he from his initial position?
  53. Maths

    Find the length of the parallel of latitude 42 degree north.
  54. physics

    If there were no air resistance, with what speed would drops hit the Earth if they fell from a cloud 3881 m above the Earth’s surface? The acceleration of gravity is 10 m/s
  55. Physics

    The radius of the Earth is about 6.37 × 106 m. a) What is the centripetal acceleration of a point on the equator due to the rotation of earth about its axis? Answer in units of m/s 2
  56. physics

    I am so confused How fast (in km/hr) must a plane fly along the Earth's equator so that the Sun stands still relative to the passengers. The radius of the Earth is 6400 km
  57. science

    object weighs 40 N on earth's surface. it would weight on 10 N when its distance from earth's center is doubled halved tripled or quadrupled thankyou
  58. PHYSICS

    At the Earth's surface, a projectile is launched straight up at a speed of 8.4 km/s. To what height will it rise? Ignore air resistance and the rotation of the Earth.
  59. physics

    What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 208 km above Earth's surface? (b) What is the period of revolution? I got a to be 7786 m/s^2 but im not sure how to get b.
  60. earth

    How long would it take a brown dwarf star, five times the size of the Earth, to travel 450 light years, at 3500 mph?
  61. physics

    if the radius of the earth is 6.37 times 10 to the third power in km, what is the speed in km/h resulting from the rotation of earth of a person standing on the equater. then, convert the answer to m/s.
  62. Earth

    Some scientists have hypothesized that meteorites have periodically bombarded Earth and caused mass extinctions every 26 million years. How might this hypothesis be tested?
  63. Physic

    What is the period of revolution of a satellite with mass m that orbits the earth in a circular path of radius 7820 km (about 1450 km above the surface of the earth)?
  64. science

    object weighs 40 N on earth's surface. it would weight on 10 N when its distance from earth's center is doubled halved tripled or quadrupled thankyou
  65. Is this right Ms Sue ???

    through their study on earth, geographers learn how earth and its people affect ? human health the solar system each other political systems***
  66. earth

    Six artificial satellites complete one circular orbit around a space station in the same amount of time. Each satellite has mass m and radius of orbit L. The satellites fire rockets that provide the force needed to maintain a circular orbit around the
  67. Physics help

    A plane flies 230 mph at 60 degrees north of west for 2.5 hours. Answer the following questions. A. How far did it travel total? B. How far west did it go? C. How far north did it go? D. How fast did it go west? I don't know how to do this problem :(
  68. Physic II

    How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the Earth) of one of the protons? Fiqure is triangle with equal sides 2.5 m and base is 0.5 m
  69. Science

    What would happen to an object if the force of gravity on earth was decreased by half A. It’s mass would decrease B. It’s weight would decrease**** C. It’s density would decrease D. It’s volume would decrease
  70. physics

    Calculate the force of gravity between a newborn baby (mass = 2.6 kg) and the planet Mars (mass = 6.4 * 10^23 kg) when Mars is at its closest to Earth (distance = 5.6* 10^10m).
  71. 8th grade

    draw a diagram showing the motion of a satellite around Earth. Draw the force vectors acting on the sattelite. Is the sattelite accelerating?
  72. south carolina history

    what was the main purpose of the 1782 jacksonborough assembly? please help me i cant find anything!!!!
  73. Math

    A man goes 7m east and then 24m to south. Find his distance from the starting point
  74. Social Studies PLEASE HELP!

    1. The first successfully established English colony in North America was (1 point) Plymouth. New York. Jamestown. Santa Fe. 2. Protestants who wanted to reform the Anglican Church were called (1 point) Pilgrims. Puritans. Plymouthians. priests. 3. How did
  75. physics

    you could produce a sample containing 2,400,000 free neutrons, what would it be 2658 seconds later? A) 300,000 neutrons, 2,100,000 protons, and 2,100,000 electrons. MY ANSWER B) 300,000 neutrons and 2,100,000 protons C) 300,000 neutrons, 2,100,000 protons,
  76. physics

    A ship leaves the island of Guam and sails a distance 280 at an angle 38.0 north of west.In which direction must it now head so that its resultant displacement will be 115 directly east of Guam? (Express your answer as an angle measured south of east) How
  77. Physics

    The atomic number of an element is determined by the number of electrons in the nucleus of the atom. True False*** The motion of electrons can be predicted precisely. True False*** Leptons are found in the nucleus of atoms. True False*** Matter can change
  78. chemistry

    Can someone please explain this question to me, i am not sure if i am right but i think the answer is 2? How many of the following elements have 2 unpaired electrons in the ground state? how many of the following elements have 2 unpaired electrons in the
  79. Chemistry

    What is the symbol for an ion with 63 protons, 60 electrons, and 88 neutrons? If an ion contains 50 protons, 68 neutrons, and 48 electrons, what is its symbol? Please help me.. im soo lost in this problem!
  80. Physics

    A canoe has a velocity of 0.410m/s southeast relative to the earth. The canoe is on a river that is flowing at 0.510m/s east relative to the earth. Find the magnitude of the velocity v⃗ c/r of the canoe relative to the river
  81. physics

    A canoe has velocity of 0.40m/s southwest relative to earth.the canoe is on a river that is flowing 0.50m/s east relative to earth find the velocity (magnitude and direction) of the canoe relative to the river.
  82. Physics(Help!!!!)

    A person of mass m2= 85.0 kg is standing on a rung, one third of the way up a ladder of length d= 3.0 m. The mass of the ladder is m1= 15.0 kg, uniformly distributed. The ladder is initially inclined at an angle θ= 35.0∘ with respect to the
  83. math

    1. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on earth also varies according to the elevation of the object? In particular, the weight of an object follows this equation: , where
  84. Physics

    A 75.0 kg object is on an incline of 30 degrees horizontally. I have to calculate several things from this, and I need help with some of them. I have to find the following: 1. Static coefficient of friction 2. Kinetic coefficient of friction 3.
  85. Physics

    A 2.40 m length of wire is held in an east-west direction and moves horizontally to the north with a speed of 15.1 m/s. The vertical component of Earth's magnetic field in this region is 40.0 µT directed downward. Calculate the induced emf between the
  86. History

    "With malice toward none, with charity for all...let us strive...to bind up the nation's wounds...to do all which may achieve a just and a lasting peace among ourselves and with all nations." - Abraham Lincoln, Second Inaugural Address Based on the lesson
  87. Chemistry-Formal Charge

    I have a test tomorrow and I don't really understand how to do formal charge and I've been looking at it and it just isn't clicking. Thank you for your help. Count the electrons around the atom. If the electron(s) is/are shared with another atom, half goes
  88. Physics

    Hello recently I was asked to find the time it takes a satalite that is geocentric (that always stays above the same exact spot of the earth) so... I was given the radius of 61 earth radius or simply 3.89 E 6 m mass of earth what G equals and have to use
  89. south carolina history help me ASAP PLZZZZZ

    _______ established a lower house, an upper house, and a president who could not be elected. declaration of independence treaty of paris south carolina constitution of 1776 townshend acts
  90. Calculus, Related Rates

    At 12 noon ship A is 60 miles west of point P steaming east at 15 knots and ship B is 36 miles south of P steaming north at 10 knots. If the ships continue their courses and speed. how is the distance between them changes at 2pm? At what time the ships are
  91. Science

    The sun's apparent motion across the sky from East to West daily is due to the A) rotation of the sun. B) rotation of the earth.*** C) orbit of the earth around the sun. D) orbit of the sun around the earth
  92. social studies

    how did the crusades encourage europeans to explore The Crusades took thousands of men from Europe to Turkey, Israel, and other parts of the Middle East. There they learned of different ways of life and exotic products from many other parts of the world.
  93. history

    What problems did South Africa face in its transition to demacracy? What have been the magor achievments and problems in the new South Africa?
  94. Help w/this one again(Math!!)

    Write one or two equations to represent the situation below. Solve the equation(s). Show all your work. Two cars leave town going in opposite directions. The car heading north travels at 55 mph. The car heading south travels at 75 mph. How long will it
  95. Physics

    A person walks 28.2◦ north of east for 3.33 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk?
  96. TRIG

    please help two questions h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 5 2 9 6 7 1 5 7 also A surveillance satellite circles Earht at a height of h miles above the surface. Suppose that d is the distance, in miles, on the
  97. physics

    A 40.2-kg skater is standing at rest in front of a wall. By pushing against the wall she propels herself backward with a velocity of -1.84 m/s. Her hands are in contact with the wall for 1.17 s. Ignore friction and wind resistance. Find the average force
  98. Physics - work done

    A variable force F acts through a displacement d. The magnitude of the force is proportional to the displacement, so F=kd, where k is constant. a) Sketch a graph of this force against position up to position x. b) According to the equation, what is the
  99. Physics

    A rocket that weighs 7840 N on earth is fired. The force of propulsion is + 10 440N. Determine a) the mass of the rocket, b) the acceleration of the rocket, c) the velocity of the rocket at the end of 8.0 s.
  100. Physics 203

    A satellite with a mass of 310 kg moves in a circular orbit 7.00*10^7 m above the Earth's surface. (a) What is the gravitational force on the satellite? (b) What is the speed of the satellite? (c) What is the period of the satellite?