1. physics

    During a rockslide, a 520kg rock slides from rest down a hillside that is 500m long and 300m high. The coefficient of kinetic energy between the rock and the hill surface is .25. a) If the GPE energy U of the rock –Earth system is zero at the bottom of the hill, what is the ...
  2. physics

    ⦁ Find the resultant vector (magnitude and direction) for the sum of: vector A which has magnitude 365 N at 48° south of west, vector B which has magnitude 224 N at 26° south of east, and vector C which has magnitude 488 N at 12° west of north. Express the direction ...
  3. Biology

    1. A theory and a hypothesis are different in that: A. you must have a theory before you can form a hypothesis. B. a theory is developed as a result of broad agreement among scientists and a hypothesis is a much less substantiated idea. C. a theory is much easier to disprove ...
  4. Physical Science

    I have a really good grade in this class and I need to keep it that way. I am only asking to have my answers checked. I would like to graduate with honors so please help if you can. 1. A car traveling along the highway needs a certain amount of force exerted on it to stop. ...
  5. Physical Science

    I have a really good grade in this class and I need to keep it that way. I am only asking to have my answers checked. I would like to graduate with honors so please help if you can. 1. A car traveling along the highway needs a certain amount of force exerted on it to stop. ...
  6. maths

    Fence post are placed 3m apart from each other. How many posts will be placed over a distance of 45m?
  7. Sci

    Does my poem below have these things "explain why it is where it is on the periodic table, what element(s) it might combine with to make a compound/molecule, and finally, WHY it would interact with that other element" Here is the Poem Below: “What’s your element my name...
  8. Physics. Help Please

    Gabriele enters an east-w straight bike path at the 3.0-km mark and rides w at a constant speed of 8.0 m/s. At the same time, Xena rides east from the1.0-km mark at a constant speed of 6.0 m/s. 1. Write function x(t) that describe the position of Gabriele as a function of time...
  9. Physics

    Two parallel forces of magnitude 4 and 6 newton are acting on a body placed at 4m apart. Resultant force will be
  10. Physics

    An artery branches into two smaller veins, identical arteries as shown in the diagram. The largest artery has a diameter of 10 mm. The two branches have the same diameter = 5 mm. The average speed of the blood in the main artery is given in the diagram. The blood has a density...
  11. Physics

    An artery branches into two smaller veins, identical arteries as shown in the diagram. The largest artery has a diameter of 10 mm. The two branches have the same diameter = 5 mm. The average speed of the blood in the main artery is given in the diagram. The blood has a density...
  12. Science- Physics

    Two plane mirrors, A and B, are separated by 30.0 cm facing each other. An object is placed 20 cm from mirror A. Locate the first two nearest image formed by each mirror.
  13. physics

    A satellite with a mass of ms = 7.00 × 103 kg is in a planet's equatorial plane in a circular "synchronous" orbit. This means that an observer at the equator will see the satellite being stationary overhead (see figure below). The planet has mass mp = 8.59 × 1025 kg and a ...
  14. maths

    Given that^2 is a zero of the cubic polynomial 6x3+2x2-10x-4^2, find its other two zeroes
  15. Maths

    Given that√2 is the root of cubic polynomial 6x3 + 2x2-10x -4√2 find the other two roots
  16. Algebra

    I can not figure out how to set this problem up. I know the answer is 200 mi, 220 mi. Two different routes between two cities differ by 20 miles. Bill and Lou made the trip between the cities in exactly the same time. If one traveled the shorter route at 50 mph and the other ...
  17. Math

    A telephone is anchored to the ground by a long cable called a guy wire, at a point 5 meters from the base of the pole, the wire makes an angle of 72.5 degrees with the horizontal. What is the length of the guy wire? HELP ASAP! I forgot how to compute for this (Pythagorean ...
  18. math please

    Before electricity, nights in towns and fields were often times pitch black, except when there was a full moon. How many times brighter is the noonday sun than the full moon when the moon is at the closest point to the earth? Model the moon as a sphere of radius 1,000 miles (1...
  19. College Physics - fixed

    A positive and a negative charge are positioned as shown: + | - _______| The distance from - to corner is 4.00m and the distance from corner to + is 3.00m. Q1 = 4.00 microCoulomb Q2 = -4.00 microCoulomb 1. What is the distance between the charges? 2. What is the angle of West ...
  20. math

    Find the measures of two angles, one positive and one negative, that are coterminal with the given angle. 7pi/3
  21. biology

    What is the source of energy driving the hydrolic cycle? a. evaporation of the ocean water b. heat conducted from the earth's core to the surface c. radiant heat from the sun d. air currents returning to the earth's surface I chose a) evaporation of the ocean water. but after ...
  22. Physics - Buoyant Force Question

    Find the buoyant force on a helium balloon in air (Standard Pressure and Temperature) if the balloon is spherical with diameter 12.0 cm.
  23. physics

    Mercury is an average distance of 5.79 x 107 km from the Sun. Estimate the length of the Mercurian year given that the Earth is 1.50 108 km from the Sun on the average. An explanation of how to do this would be great, thanks.
  24. physics

    A satellite has a mass of 106 kg and is located at 1.96 106 m above the surface of Earth. (a) What is the potential energy associated with the satellite at this location? J (b) What is the magnitude of the gravitational force on the satellite? N
  25. chem

    1. what is the quantum numbers of the last electron of Sb?(n= l= ml= ms=) and why the answer are this number? 2.how many electrons would be found in the n=6 level if all possible orbitals were completely filled with electrons? how to calculate this one? Thank you~
  26. Physics

    Shun started driving south-west for 450 meters then turned south south for 500 meter and stopped. Find Shun's displacement
  27. physics

    Water flows through a horizontal tube of diameter 2.6cm that is joined to a second horizontal tube of diameter 1.7cm . The pressure difference between the tubes is 8.0kPa.Find the speed of flow in the first tube.
  28. physics

    two small objects, A and B, are fixed in place and separated by 3.00 cm in a vacuum. object A has a charge of +2.00 micro coulomb , and object B has a charge of -2.00 micro coulomb. how many electrons must be removed from A and put onto B to make the elecrtostatic force that ...
  29. English

    Write this in your own words. what is Pollution? Pollution is the introduction of contaminants into the natural environment that cause adverse change.[1] Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the components of ...
  30. Physics

    Four 6.5-kg spheres are located at the corners of a square of side 0.70 m . Calculate the magnitude of the gravitational force exerted on one sphere by the other three. Calculate the direction of the gravitational force exerted on one sphere by the other three.
  31. phy

    A force of magnitude 7.50 N pushes three boxes with masses m_1 = 1.30 kg,m_2 = 3.20 kg, and m_3 = 4.90 kg .The mass is side by side. 1-Find the magnitude of the contact force between boxes 1 and 2, and 2-Find the magnitude of the contact force between boxes 2 and 3.
  32. phy

    A force of magnitude 7.50 N pushes three boxes with masses m_1 = 1.30 kg,m_2 = 3.20 kg, and m_3 = 4.90 kg .The mass is side by side. 1-Find the magnitude of the contact force between boxes 1 and 2, and 2-Find the magnitude of the contact force between boxes 2 and 3.
  33. Physics

    In solid sodium chloride (table salt), chloride ions have one more electron than they have protons, and sodium ions have one more proton than they have electrons. These ions are separated at about 0.28 nm. Calculate the electrostatic force between the sodium ion and the ...
  34. Physics

    In solid sodium chloride (table salt), chloride ions have one more electron than they have protons, and sodium ions have one more proton than they have electrons. These ions are separated at about 0.28 nm. Calculate the electrostatic force between the sodium ion and the ...
  35. Physics

    In solid sodium chloride (table salt), chloride ions have one more electron than they have protons, and sodium ions have one more proton than they have electrons. These ions are separated at about 0.28 nm. Calculate the electrostatic force between the sodium ion and the ...
  36. Physics

    In solid sodium chloride (table salt), chloride ions have one more electron than they have protons, and sodium ions have one more proton than they have electrons. These ions are separated at about 0.28 nm. Calculate the electrostatic force between the sodium ion and the ...
  37. College Physics - fixed again!

    A positive and a negative charge are positioned as shown: + | |_______ - The distance from - to corner is 4.00m and the distance from corner to + is 3.00m. Q1 = 4.00 microCoulomb Q2 = -4.00 microCoulomb 1. What is the distance between the charges? 2. What is the angle of West ...
  38. physics

    trying to study but stuck with this one. Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 4.62 x 10-6 kg. The gravitational force that each sphere exerts on the other is balanced by the electric force. Determine the charge...
  39. science

    . How does the principle of uniformitarianism accounts for occasional catastrophic events such as meteorite impacts, huge volcanic eruptions, or great earthquakes? In what ways do geologic processes affect a person's daily life? . When astronauts brought back rock samples from...
  40. physics

    In which situation is maximum work considered to be done by a force? The angle between the force and displacement is 180°. The angle between the force and displacement is 90°. The angle between the force and displacement is 60°. The angle between the force and displacement ...
  41. chemistry

    Hello, I have a question regarding the valence electrons of transition metals. I am aware of quantum numbers etc and how the s orbital gets filled before the d orbital but my question is that is if was asked to lets say group some elements according to their valence electrons,...
  42. Trigonometry

    A triangle has two angles, one 90 degrees, the other (between adjacent and hypotamuse) 26 degrees, and a hypotamuse of 10ft. Find the opposite side's length. Hint: use sine. I think I'm supposed to do 10(sine26), but the answer isn't right. What am I missing? Thanks!
  43. pre-algebra

    ok Relation between two quantities expressed as the quotient of one divided by the other? please help this is puzzling
  44. english

    plz help me i want small dialogue Between two friends-the one a believer, and other a disbeliever, in ghost stories.
  45. electric engineering

    An aircraft has a wing span of 56 m. It is flying horizontally at a speed of 900 km/hr and the vertical component of earth’s magnetic field is 0.4 m Wb/m2. Calculate the P.D between the wing tips of the air craft
  46. PLEASE HELP ME WITH PHYSICS!!

    A truck is traveling at 16 m/s to the north. The driver of a car, 500 m to the north and traveling south at 25 m/s, puts on the brakes and slows at 3.5 m/s2. Where do they meet? The truck has constant velocity of 16m/s. The car is 500m away, has velocity of 25m/s and ...
  47. social studies help!

    How did the Fugitive Slave Act and the Kansas-Nebraska Act further divide the North and South? What role did the concept of popular sovereignty play in these conflicts? Do you think there was any way to avoid the violence that came out of this era? what I have so far is, ...
  48. Science

    .a sodium atom has the following distribution of electrons in its energy cells: shell1: 2 electrons shell2: 8 electrons shell3: 1 electron I think its shell 2
  49. physics

    A pulley with diameter D = 27in weighs 80 lb. It is mounted on a diameter d = 2-in axle. A weight of 1000 lb is to be lifted. If the coefficient of friction f = 0.1, what vertical pull force P will be needed?
  50. Physics

    A plumb bob does not hang exactly along a line directed to the center of the Earth's rotation. How much does the plumb bob deviate from a radial line at 38.5° north latitude? I got my answer to be 0.122288439 deg but it was incorrect. I used theta= a(sin 38.5)/g (which ...
  51. physics

    Two forces 5N &10N are acting at an angle of 120° between them. Find the resultant force in magnitude and direction.
  52. Science

    Two forces of 20 N and 5 N are acting at an angle of 120 degree between them. Find the resultant force in magnitude and direction ?
  53. Physics

    This is a two-dimensional kinematics question: A particle's position coordinates (x,y) are (2m, 3m) at t=0; (6m, 7m) at t=2s, and (13m, 14m) at t=5s. Find the average velocity vector between t=0s and a) t=2s, b) t=5s. I don't know how to find this without acceleration being ...
  54. Science Earths Evolution

    Tell me what you think plz 1.The Reason why it was not a solid planet yet is because Rocks or asteroids were still being formed. All there was were Dust and Tiny Particles were forming the asteroids. This was probably in the Hadean Era Because it was long ago, That’s ...
  55. Math

    The distance between two numbers on the number line is 19. One of the numbers is 8. What are the two possibilities for the other number? A.-27 and 11 B.-11 and 8 C.-11 and 27 D.-8 and 19 22.Which integer has the greatest absolute value? A.9 B.0 C.-13 D.-8 C
  56. algebra

    A can of soda at 79°F is placed in a refrigerator that maintains a constant temperature of 36°F. The temperature T of the soda t minutes after it is placed in the refrigerator is given by T(t) = 36 + 43e−0.058t. (a) Find the temperature, to the nearest degree, of the ...
  57. Math

    A lorry travels at 50km/h. Given that the diameter of its wheel is 88cm, find how many revolutions per minute the wheel is turning. Given your answer to the nearest whole number.
  58. physics

    Two artificial satellites, 1 and 2, orbit the Earth in circular orbits having radii R1 and R2. If R2=2R1, the accelerations a2 and a1 of the satellites are related how?
  59. Physics

    A spring has a force constant of 100N/m and an unstretched lenght of .07 m. One end is attached to a post that is free to rotate in the center of a smooth table. The other end is attatched to a 1 kg disc moving in uniform circular motion on the table, which stretches the ...
  60. trigonometry

    A tent pole is 85 feet high. A cable is attached to the ground 200 feet from the tower base. How long is the cable? What is the measure of the angle the cable makes to the ground?
  61. Language Arts

    I think that I shall never see A poem lovely as a tree. A tree whose hungry mouth is prest Against the earth’s sweet flowing breast; A tree that looks at God all day, And lifts her leafy arms to pray; A tree that may in summer wear A nest of robins in her hair; Upon whose ...
  62. english 9

    Read the conclusion about “The Beginnings of the Maasai,” and then answer the question. One purpose of “The Beginnings of the Maasai” is to explain the weather. Which excerpt best justifies this conclusion? The sky god is powerful, but can change from nurturing to ...
  63. Science

    1. How did planetesmals form planets? A. They broke apart into smaller chunks. B. They collided and stuck together.<<(I think it's this answer) C. They cooled and pulled ice together. D. They began to rotate. 2. What distance was used to define the astronomical unit (AU...
  64. Precalc(attn Bobpursley)

    Hi i posted this before but I wanted to ask Bobpursley a few questions on his reply 1)For the first function you used cosine when they ask for sin, why is that? Also why did you put .5 in the beginning and end of the function? 2)For the second question why did you put 10 in ...
  65. Math

    A 12 foot-high pole casts a 9 foot long shadow, at the same time of day, what would be the length of a shadow cast by a 45 foot-long tree
  66. Math 7

    how high is a tree that casts a 25 foot shadow at the same time a 6 foot pole casts a 10 foot shadow? Please help! I don't understand how to solve any problem like this!!
  67. History

    3.How did Christianity help enslaved people resist? A.It taught them how to read and write B.It taught them the values of following rules C.It taught them that the wealthy were usually kind. D.It taught them that bad circumstances could be overcome. 4.How did the election of ...
  68. Physics

    As Alan is taking a shower, the soap falls out of the dish and Alan steps on it with a force of 500 N. If Alan slides forward and the frictional force between the soap and the tub is 50 N, what is the coefficient of friction between these two surfaces?
  69. Physics

    As Alan is taking a shower, the soap falls out of the dish and Alan steps on it with a force of 500 N. If Alan slides forward and the frictional force between the soap and the tub is 50 N, what is the coefficient of friction between these two surfaces?
  70. Physics

    As Alan is taking a shower, the soap falls out of the dish and Alan steps on it with a force of 500 N. If Alan slides forward and the frictional force between the soap and the tub is 50 N, what is the coefficient of friction between these two surfaces?
  71. maths

    A heavy 9cm diameter ball is placed in an empty cylindrical tin of diameter 12cm. Enough water is poured into the can to cover the ball.if the ball is then removed , how far does the water level fall
  72. maths

    A heavy 9cm diameter ball is placed in an empty cylindrical tin of diameter 12cm. Enough water is poured into the can to cover the ball.if the ball is then removed , how far does the water level fall
  73. Linear algebra

    In a medical prognosis model, there are three states for a person: well, ill and dead. We are given that the prob. one states well given that the person is well is 0.3. The prob. one becomes ill given that one is well is 0.5. The prob. one states ill given that one is ill is 0...
  74. Physics

    Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
  75. Physics

    Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
  76. Physics

    Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
  77. Physics

    A satellite has a mass of 99 kg and is located at 1.97 106 m above the surface of Earth. (a) What is the potential energy associated with the satellite at this location? Answer in J (b) What is the magnitude of the gravitational force on the satellite? Answer in N
  78. Physics

    1. A test charge of +2x10^-7 C is located 5 cm to the right of a charge of +1x10^-6 C and 10 cm to the left of a charge of -1x10^-6 C. The three charges lie on a straight line. Find the force on the test charge? 2. A charge of -2x10^-9 C in an electric field between two metal ...
  79. physics

    In a certain binary star system, each star has the same mass as our sun, and they revolve about their center of mass. The distance between them is the same as the distance between the EArth and sun. Wha tis their period of revolution in years?
  80. Physics 1

    Two small particles of mass 16 kg and 27 kg are a distance 1.4 m apart. What is the gravitational force of one of these particles on the other?_____N
  81. physics

    While two forces act on it, a particle is to move at the constant velocity = (3.99 m/s) - (-3.19 m/s). One of the forces is 1 = (1.32 N) + (-5.76 N). What is the other force?
  82. Math

    A one-minute advertisement on a local television station during prime time (8-10 p.m. on weeknights) costs the advertiser $12800. To the nearest cent, how much does the advertisement cost per second? I converted the minute to 60sec. Then divided the cost by the 60 and got $213...
  83. physics

    Two girls each weight 500 N. Ride in a car traveling at 20.0 m/s. One wears a seat belt. The other does not. In an accident the girl wearing the seat belt is brought to a stop in 0.120 seconds. The dashboard brings the other one to a stop in only 0.00800 seconds. What is the ...
  84. history

    how were the south and the north the same?
  85. Physics - Momentum of cars at intersection

    Two cars of identical mass are approaching the same intersection, one from the south and the one from the west. They reach the intersection at the same time and collide. The cars lock together and move away at an angle of 22deg counterclockwise from the road; heading east. ...
  86. Chemistry

    I need chemistry help. I think 1. c, 2.b, & 3.a (please tell me why or why not and help me set up the problems if possible) 1.) The following half reaction has been balanced except for the electrons. How many and where should the electrons be included? 14 H+(aq) + Cr2O72-(aq...
  87. physical science

    plse make sure these are correct 1.When an atom loses an electron is.. a. becomes a negative ion. b. becomes a positive ion. c. forms a covalent bond. d. gains protons is the answer D 2.Which of these is a property of an ionic compound? a. low melting point b. poor conductor ...
  88. college

    Find the minimum initial speed of a projectile in order for it to reach a height of 2039 km above the surface of the earth.
  89. Physics

    The moon is 384,000 km from the earth and makes 1 revolution in 27.3 days. Find its angular and linear speeds in its orbit.
  90. Physics 203

    An object is projected upward from the surface of the Earth with an initial speed of 4.6 km/s. Find the maximum height it reaches.
  91. Physics

    Find the minimum initial speed of a projectile in order for it to reach a height of 2022 km above the surface of the earth.
  92. 10th grade

    i have an equation; x^2+3x-18=0. i am given one of the roots, of which is 3, but how do i find the other root.
  93. Calculus

    Two ships are leaving port at the same time. The first ship is sailing due east at 20 km/hr and the other due north at 15 km/hr. How fast are the ships moving away from each other 2.0 hr later?
  94. english

    My teacher told me that this sentence is ambigious. Can someone help me to fix this. "One of the main impacts is the transmission of many infectious diseases carried by insects, such as malaria and dengue which are sensitive to temperature, humidity, and changes in forest ...
  95. Physics

    A duck has a mass of 2.3 kg. As the duck paddles, a force of 0.08 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.21 N in a direction of 55° south of east. When these forces begin to act, the velocity of the duck is 0.10 m/s in ...
  96. physics

    Two workers are moving a slab of ice (m = 290 kg) across the factory floor. As seen from above, one worker exerts a force of 415 N at an angle of -20o, and the other exerts a force of 470 N at an angle of 50o. What is the magnitude of the acceleration of the ice slab?
  97. Physics

    We want to find how much charge is on the electrons in a nickel coin. Follow this method. A nickel coin has a mass of about 4.9 g. Find the number of atoms in a nickel coin. Each mole (6.02 × 10 23 atoms) has a mass of about 58.1 g. Answer in units of atoms Find the ...
  98. social studies

    Who wrote the Virgin Islands national anthem Anastasia, have you done a google search on the Virgin Islands to find the answers to your questions? You might start there first. yes i did but i didn't find what i neededto find Ok, here's what I found for the Wikipedia entry for...
  99. Math

    1. 1. A police cruiser approaching a right-angled intersection from the north, is chasing a speeding car that has turned the corner and is now moving due east. When the cruiser is 0:6 miles north of the intersection and the car is 0:8 miles to the east, the police determine ...
  100. science

    I really need help with science and this is the questin reason for blank because earth is titled 23 1/2 from a line perpendicular to it's orbit,the legth of daylight varies and because of the angle at which the sun's energy strikes a given location through the year.
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