1. physics

    A 3Kg projectile is fired straight upward from earth's surface with a speed that is one-fourth the escape speed. Neglecting air resistance. a) What is the Kinetic energy of this projectile when it is launched? b) what is the gravitational potential energy
  2. 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 56o with the vertical, and the chair is 46 m from the pole. 1)What is the
  3. 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 56o with the vertical, and the chair is 46 m from the pole. 1)What is the
  4. Physics

    What changed Newton's original work on the movement of the Moon around the Earth into the law of universal gravitation? 1) his conclusion that the same laws applied to all objects, no matter how small 2) his connection of gravitation to his first law 3)
  5. physics

    What changed Newton's original work on the movement of the Moon around the Earth into the law of universal gravitation? 1) his conclusion that the same laws applied to all objects, no matter how small 2) his connection of gravitation to his first law 3)
  6. physics

    What changed Newton's original work on the movement of the Moon around the Earth into the law of universal gravitation? 1) his conclusion that the same laws applied to all objects, no matter how small 2) his connection of gravitation to his first law 3)
  7. Astrophysics

    The Earth formed at a redshift of z∼0.53. That means that when our world was young, the universe was quite a bit smaller than it is today. The nearest galaxies to our own are around 10 kpc (kilo-parsecs) in size, lie at a distance of around 1 Mpc
  8. Physics

    I have to find the eccentricity of an elliptical orbit with one focus, earth's center, E. I know the formula to find eccentricity is sqrt(1-)(b^2/a^2), but I don't know where to use the radius or if I need it. Do I just need to use the eccentricity formula
  9. Science

    Explain the law of motion needed to solve thisproblem . On Planet Zorg, a 30 kg barbell can be lifted by only exerting a force fo 180N. What is the acceleration of gravity on Planet zorg? Predict how the motion of this object would change if on earth.
  10. 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?
  11. science

    I am studying science at GCSE. I a working through a revision book and have come across a question which i am unsure of the answer. The question is, "state the number of different elements present in C6H5CO2Na." The answer i have is 14 but still i am
  12. Science

    Hi i have a science exam on tuesday and really need some help to see if what im doing is right. The question is - How many electrons, protons and neutrons are in the following: a) Br1- b) Be2+ c) Ne d) P1- e) Fe AND MY ANSWERS ARE: a)35 electrons 35
  13. physics

    Two objects are approaching an intersection. One is a 50 kg traveling at 8 m/s from east to west and the other is a 40 kg going from south to north at 12 m/s. (a) Find the x and y components of the net momentum of this system. (b) What are the magnitude
  14. History

    I need to find a little more information between the similarities between the North and South where it consists of political and economic. Here is what I have: Political they the white men ruled the government. Economic: Farms for living, had livestock. Is
  15. chemistry

    According to the octet rule a calcium atom has a tendecy to.? Look at Ca on the periodic table. It is in group 2 (or IIA depending upon the system your teacher is using). That tells you that it has two electrons in its outer shell and that means it will
  16. applied mechanics

    A solid shaft of 65mm outside diameter and a hollow shaft of 85mm outside diameter are connected by 6 bolts with the mean pitch of thread being 155mm. The shear stress due to the torque on the shafts is equal to the shear stress on the bolts. a) Find the
  17. Science

    In __, the amplitude of the carrier wave is changed to transmit information; the frequency is not changed. In __, the frequency of the carrier wave is changed __ phones and __ phones use radio waves to transmit signals. __ use electromagnetic signals from
  18. people

    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
  19. 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 52 kilometers at heading 79 degrees South of West. Then he flies 26 kilometers heading 22 degrees north of East. After this he
  20. History

    How did the war with Mexico lead to conflict between the North and the South?
  21. information u.s. history

    people and economy in the north and south in 1850s
  22. GEOMETRY

    Is it true that vertical angles must be oriented north-south?
  23. Someone good is History!!!!!!

    What effect did the Emancipation Proclamation have on the North and South?
  24. earth science

    how do we find the mass of an object? mass=density * volume
  25. Chemistry

    How many valence electrons does molybdenum have? (give only 1 answer) Go to this site and look for the electrons available in the outside shells. Click on element #42 and scroll down the menu on the left side until you come to electron configuration.
  26. Physics

    A solid shaft of 65mm outside diameter and a hollow shaft of 85mm outside diameter are connected by 6 bolts with the mean pitch of thread being 155mm. The shear stress due to the torque on the shafts is equal to the shear stress on the bolts. a) Find the
  27. applied mechanics

    A solid shaft of 65mm outside diameter and a hollow shaft of 85mm outside diameter are connected by 6 bolts with the mean pitch of thread being 155mm. The shear stress due to the torque on the shafts is equal to the shear stress on the bolts. a) Find the
  28. physics vectors w/angles

    A little girl is riding a sled horizontally in the snow, the combined mass of the girl and sled is 33.4 kg. She is being pulled by her parents. Mom is pulling her with a force of 5.18 N, at an angle of 20.0 degree E of N. Dad is pulling her with a force of
  29. Regents

    Where is the site of the Regents countdown for Earth Science? It has the days, hours, minutes, etc. and I can't find it. Please help. Thank you.
  30. physics

    What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth gR2(R+h)2 gR(R+h) g(R−h)R g(R−h)2R2 2 The instrument used for experimental determination of the value of the universal
  31. physics

    Mike walks 100 meters north, then walks 30 meters south. After this, he walks another 10 meters north. What is the magnitude of his total displacement during this walk, in meters?
  32. Geography Report (Ms. Sue)

    I know you told me to not post a rough draft, but I am struggling to write my first paragraph. I do not know if this even relates to the first theme of geography, which is location. Ms. Sue, please, although I haven't even complete this paragraph yet,
  33. Physics

    A) Gravity pulls an area of wet soil and rock downward in a landslide B) An ... Many people know that the weight of an object varies on different planets, but did ... If the Earth's gravitational force causes a falling 74 kg student to accelerate .... the
  34. physics

    An earth satellite moves in a circular orbit with an orbital speed of 6200m/s. a) find the time of one revolution. b) find the radial acceleration of the satellite in its orbit.
  35. Astronomy

    Hi, can you please check my work? I really need to do well on this. 1. What properties of a star are needed to calculate the stars luminosity? a. size and apparent brightness b.mass and distance to the star**** c. temperature and diameter of the star d.
  36. Physics

    Obi-Wan lands his spacecraft on an unknown planet. Visibility is poor, so he isn't able to exactly determine on which planet he has landed. He finds someone on a local communications channel and asks for directions to Earth. "You are already on Earth," is
  37. Math

    Question: An electron is released from rest in a uniform electric field and accelerates to the north at a rate of 249 m/s^2 . Part A: What is the magnitude of the electric field? Answer: E=_____ N/C Part B: What is the direction of the electric field?
  38. science

    What is the geologic time scale and what are some thing scientists use it for (at least two things)? Here's my answer could you please verify. the geologic time scale is a record of the geologic events and life forms in Earth’s history. Scientists use it
  39. Physics

    Two forces act concurrently on a point P. One force is 60nt due east. The second force is 80nt due north. (a) Find the magnitude and direction of their resultant. (b) What is the magnitude and direction of the equilibriant?
  40. physic

    A solid shaft of 65mm outside diameter and a hollow shaft of 85mm outside diameter are connected by 6 bolts with the mean pitch of thread being 155mm. The shear stress due to the torque on the shafts is equal to the shear stress on the bolts. a) Find the
  41. physics

    explain the law of motion needed to slove this problem. On Planet Zorg, a 30kg barbell can be lifted by only exerting a force of 180N. what is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change on earth.
  42. Physics

    A proton is traveling horizontally at 5.4 × 106 m/s in a direction 45o north of west. A magnetic flux density has a magnitude of 0.25 T and is directed north. What is the force on the proton? Answer 1.5 × 10-13 N, up 2.1 × 10-13 N, down 1.5 × 10-13 N,
  43. 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
  44. 7th grade Science help

    1. _______ is energy that flows from an object with a higher temperature to an object with a lower temperature. (1 point) Heat Radiation Potential Chemical 2. The transfer of energy that occurs when molecules bump into one another is called _____. (1
  45. Chemistry

    Hi. Is PO4(3-) polar or non-polar? Why or why not? Thanks! Look up the electronegativity of P and O. I think I remember that O is about 3.5 and P is about 2.1; therefore, each P-O bond is somewhat polar. Thus, the ion will be polar unless the Lewis
  46. Physics

    A tether ball of mass 0.25 kg is attached to a vertical pole by a cord 1.4 m long. Assume the cord attaches to the center of the ball. The cord makes an angle of 20° with the vertical. (a) What is the tension in the cord? (b) What is the speed of the
  47. Physics

    A tether ball of mass 0.25 kg is attached to a vertical pole by a cord 1.4 m long. Assume the cord attaches to the center of the ball. The cord makes an angle of 20° with the vertical. (a) What is the tension in the cord? (b) What is the speed of the
  48. Science

    1. Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a lunar eclipse is true? (1 point)
  49. physics

    A dog searching for a bone walks 4.31 m south, then runs 8.93 m at an angle 22.0 north of east, and finally walks 10.0 m west. Find the magnitude of the dog's resultant displacement vector.
  50. Geography (Ms. Sue)

    1). How do the North Atlantic Drift and the prevailing westerlies affect Europe's climate? A: The North Atlantic Drift, which is carried by the prevailing westerlies, brings a moderate temperature to much of Europe--from northern Spain across most of
  51. 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.
  52. 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.
  53. Will somebody help me please?

    1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is
  54. I need help..

    1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is
  55. physics

    You are standing at a spot where the magnetic field of the Earth is horizontal, points due northward, and has magnitude 36.9 μT. Directly above your head, at a height of 12.3 m, a long, horizontal cable carries a steady DC current of 381 A due
  56. physics

    You are standing at a spot where the magnetic field of the Earth is horizontal, points due northward, and has magnitude 36.9 μT. Directly above your head, at a height of 12.3 m, a long, horizontal cable carries a steady DC current of 381 A due
  57. physics

    You are standing at a spot where the magnetic field of the Earth is horizontal, points due northward, and has magnitude 36.9 μT. Directly above your head, at a height of 12.3 m, a long, horizontal cable carries a steady DC current of 381 A due
  58. physics

    The route followed by a hiker consists of three displacement vectors , , and . Vector is along a measured trail and is 1060 m in a direction 20.0 ° north of east. Vector is not along a measured trail, but the hiker uses a compass and knows that the
  59. physics

    A golfer takes three putts to get her ball into the hole once she is on the green. Her first putt displaces the ball 71.0 ft north; the second, 6.0 ft, 45 degrees south of east; and the third, 3.0 ft, 45 degrees south of west. What is the magnitude of the
  60. physics

    In the high jump, Frank's kinetic energy is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must Fran leave the ground in order to lift her center of mass 1.89m and cross the bar with a speed of 1.16m/s?
  61. earth science

    how do i find how much water vapor is in the air when given relative humidity and an air sample that is 40 degrees C?
  62. EARTH science

    A 100-gram rock has a volume of 35 cubic centimeters. Find the density of the rock.
  63. geometry

    radius of 3960 miles cause there 5280 feet find length in feet by circumference of earth use ~3.14
  64. PHYSICS

    Find the period time of the moon from the following values, R=6400km,the distance between the earth and the moon=384000km,g=9.8m/s2
  65. True or False?

    Sounds like an easy question but I just wanna be sure! :P Tides are caused by the force of inertia from the sun and moon acting on Earth. True or False? I think its false because its gravity not inertia.
  66. Math

    Test for symmetry with repsect to Q=pi/2, the polar axis, and the pole. r=16cos 3Q r=16cos(3pi/3 + 3h) = 16(cos3pi/2 3h- sin 3pi/2 sin h) cos 3pi/2 = 0 sin 3pi/2 = -1 Not symmetrical My teacher said that this was wrong!Why?
  67. Math

    Test for symmetry with repsect to Q=pi/2, the polar axis, and the pole. r=16cos 3Q r=16cos(3pi/3 + 3h) = 16(cos3pi/2 3h- sin 3pi/2 sin h) cos 3pi/2 = 0 sin 3pi/2 = -1 Not symmetrical My teacher said that this was wrong!Why?
  68. Trigonometry

    1. Brothers Bob and Tom buy a tent that has a center pole of 6.25 feet high. If the sides of the tent are supposed to make a 50deg angle with the ground, how wide is the tent? 2. A swimming pool is 30 meters long and 12 meters wide. The bottom of the pool
  69. reading

    Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. A greenhouse used for plants stays warm because sunlight and heat coming through the glass roof are mostly trapped. The heat doesn't radiate back into the
  70. Chemistry

    Use these answers for questions 4 - 7. (A) 1s2 2s22p5 3s23p5 (B) 1s2 2s22p6 3s23p6 (C) 1s2 2s22p62d10 3s23p6 (D) 1s2 2s22p6 3s23p63d5 (E) 1s2 2s22p6 3s23p63d3 4s2 4. An impossible electronic configuration 5. The ground-state configuration for the atoms of
  71. History

    The Voting Rights act of 1965 made it legal for states to A)charge votes a pole tax before casting a vote B)require a person to take an English test before voting C)refuse to allow people to vote based on their race or gender D)fine anyone who interferes
  72. physics

    Suppose that the displacement of a particle is related to time according to the expression delta x = ct^3. What are the SI units of the proportionality constant c? My answer: delta x = ct^3 m = c s^3 (s: seconds) m/s^3= c The SI units for c: m/s^3 correct?
  73. Please guys. Help me out.

    1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is
  74. physics

    A copper wire that has a diameter of 2.9 mm carries a current of 39.0 A. Assuming that each copper atom contributes one free electron to the metal, find the drift velocity of the electrons in the wire. The molar mass of copper is 63.5 g/mol and the density
  75. Physics

    A hydrogen atom is at the earth's surface. The electron and proton in the atom are separated by a distance of 5.29x10^-11m. What is the ratio of the magnitude of the electrical force exerted by the proton on the electron to the weight of the electron?
  76. Physics

    Find the energy necessary to put 5kg , initially at rest on Earth's surface, into geosynchronous orbit. Do I use the formula U=GMm/r G=6.67*10^-11 M=2.5*10^24 m=5 r=41000 Is this sort of right, any help would be greatly appreciated.
  77. physics

    Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and ùE = 1.157 x 10-5 rev/sec.
  78. physics

    Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and We = 1.157 x 10-5 rev/sec.
  79. Physics

    Find the energy necessary to put 5kg , initially at rest on Earth's surface, into geosynchronous orbit. Do I use the formula U=GMm/r G=6.67*10^-11 M=2.5*10^24 m=5 r=41000 Is this sort of right, any help would be greatly appreciated.
  80. physics

    If Earth shrinks in size such that its shape and mass remain the same, but the radius decreases to 0.21 times its original value, find the acceleration due to gravity on its surface. (6378.1/0.21)(9.80) = 2.97 m/s^2
  81. Chemistry

    1) The letter "p" in the symbol 4p^3 indicates the ___. A) spin of an electron B) orbital shape*** C) principal energy level D) speed of an electron 2) If the spin of one electron in an orbital is clockwise, what is the spin of the other electron in that
  82. Physics

    NASA lost contact with Pioneer 10 on January 22, 2003. How far in meters was it from the sun on that date? Pioneer 10 was traveling at 12.24 km/s relative to the sun. Calculate the position of Pioneer 10 as of January 2009 relative to the sun. Pioneer is
  83. Science (Chemistry)

    Can someone explain why the ratio of magnesium ions to chloride ions in MgCl2 is 1 :2 Mg is in group IIA and has two electrons in its outside shell. Cl is in group VIIA and has seven electrons in its outside shell. Mg wants to lose two electrons; Cl wants
  84. math

    p=14.63⋅0.8 Atmospheric pressure, measured in pounds per square inch p, s, i is the force exerted by Earth's atmosphere over a given area. The atmospheric pressure, p, exerted on an airplane flying at an altitude of a miles above sea level can be
  85. precalculus

    For what values of theta 0<theta < 2pie (also equal to these) do maximum r -values occur on the graph of the polar equation r= 2-4sin3 theta ? Note that a maximum r-value occurs at a point that is the max distance from the pole? I know the max is 6
  86. Social Studies

    Which of the following is a characteristic of Earth's first people? A. They lived in cold places B. They lives far from water sources C. They lived on the Asian continent D. They moved around in search of food** How do people in northern Chad adapt to the
  87. Social Studies

    Which of the following is a characteristic of Earth's first people? A. They lived in cold places B. They lives far from water sources C. They lived on the Asian continent D. They moved around in search of food** How do people in northern Chad adapt to the
  88. chemistry

    for the reaction, determine the number of transferring electrons so then i can pug into G=-nFE I'm assigning charges to each of the elements H2O2(aq) + 2ClO2(g) → O2(g) + 2HClO2(aq) (+1,-1) + (+4,-2) (0) (+1,+1,-2) since O changes from -1 to 0, so it
  89. chemistry

    for the reaction, determine the number of transferring electrons so then i can pug into G=-nFE I'm assigning charges to each of the elements H2O2(aq) + 2ClO2(g) → O2(g) + 2HClO2(aq) (+1,-1) + (+4,-2) (0) (+1,+1,-2) since O changes from -1 to 0, so it
  90. Social Studies

    My most exalted Monarch - Your Majesty Queen Isabella, I am writing this letter most humbly for you to consider my request for three small ships and a crew so that I may sail west and find the shortest route to the East. I promised to chaim land for Spain
  91. Science

    In the early 1900s, Alfred Wegener noticed that some of the Earth's continents looked like they might fit together like a jigsaw puzzle. He also observed that the continents that looked like they fit together had similar plants, animals, and rock
  92. Geometry

    A boat left dock A, traveled north for 10 miles, then 45 East of north for 20 miles and docked at B. A.How far north did the boat travel? How far east did it travel? B. Find the magnitude and direction of the direct-path vector AB. a. North 24.1 East 14.1
  93. Physics

    Your dog has been diagnosed with a terminal illness for which there is no cure. The Veterinarian expects that it will live for 1 year before it succumbs to the condition. You have the idea that if you could keep the dog alive a little longer, a cure might
  94. physical science

    The diameter of the sun makes an angle of .53 degrees from earth. How many minutes does it take for the sun to move one solar diameter in an overhead sky? ( Remember that it takes 24 hours or 1440 minutes for the sun to move through 360 degrees). How does
  95. Physics

    Three men are trying to move a wardrobe. One pushes northward with a force of 100N; the second pushes eastward with a force of 173N; the third pushes in a direction 60 degrees west of south with a force of 200N. What is the resultant force on the wardrobe
  96. 3-D Coordinates Polar coordinates Precalculus Trig

    The U.S.S. Lollipop is on assignment in the Atlantic Ocean. It travels from a longitude of 70 degrees west to 20 degrees west, along the latitude of 40 degrees north. How far does it travel? (Assume that the radius of the Earth is 6,400 km.) Erm I don't
  97. Chem

    I was asked to fraw the energy level diagram for carbon. Carbon has 6 electrons so would the 2s and 2p orbitals both be half full? 1s = 2 electrons 2s= 1 electron 2p = 3 electrons
  98. Social studies check answers ***damon***

    please check these answers 1.A 2.C 1. where would you most likely find south americas largest cities? A. Mountains B. rain forests C. coastlines D.deserts 2. how did human migration most contribute to ethnic diversity in south america today? A. people came
  99. Science Somebody Help Me Please..I have a deadline

    1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is
  100. Chemistry

    can you please help me rephrase this. The cycloaddition of a conjugated diene and a dienophile, an electrocyclic reaction that involves the 4 π-electrons of the diene and 2 π-electrons of the dienophile. The driving force of the reaction is the formation