1. AP Physics (circular motion)

    The moon revolves about the Earth in a trajectory that is very nearly a circle of radius r = 384,401 km, and requires 27.3 days (23.4 x 10^5 seconds) to make a complete revolution. What is the acceleration of the moon toward the Earth?
  2. Science

    On the main sequence, what type will have life spans of about ten billion years? I took Earth Science last year so although I do not have them in front of me, I believe the are in the Earth Science Reference Tables (ESRT).
  3. Physics

    An asteroid with mass m = 1.85*10^9 kg comes from deep space, effectively from infinity, and falls toward Earth. How much work would have to be done on the asteroid by friction to slow it to 550 m/s by the time it reached a distance of 1.50*10^8 m from
  4. Physics

    A Borg cube starship is zooming past Earth with a speed v=0.97c as shown. The cube has side lengths of 3.03 km. What is its volume, measured from Earth? Can someone step me through this problem?
  5. calculus

    Write the standard form of the equation for the path of a communications satellite in a circular orbit 22,000 miles above Earth. (Assume that the radius of Earth is 4000 miles.)
  6. Physics

    If a 1-kg mass fell toward Earth from a large distance where it had zero relative velocity, what would be the velocity at the Earth's surface?
  7. PHYSICS

    An object weighs 480 N on earth. What would its weight be on a planet whose mass is twice the mass and ratio of the earth?
  8. science

    Somewhere between Earth and the Moon, gravity from these two bodies on a space pod would canel. Is it closer to the Earth or the Moon? why?
  9. physics

    A 70 kg man weighs 686 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 14% of his body weight?
  10. physics

    I will be thank full to u if u help me in solving the below problem If the change in the value of g at a height h above the surface of the earth is same as depth x below the surface of the earth, then (h
  11. Physics

    A man has a mass of 65kg on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 13% of his body weight?
  12. physics

    At what altitude above the Earth's surface would your weight be two-thirds of what it is at the Earth's surface? (Assume Re = 6.371 103 km.)
  13. Physics

    How would the speed of Earth’s orbit around the sun change if Earth’s distance from the sun increased by 4 times?
  14. science

    Suppose the moon rotated on it axis just as quickly as Earth. Would you still always see the same side of the moon from Earth? *PLEASE HELP ME WITH THIS QUESTION*
  15. science

    Suppose the moon rotated on it axis just as quickly as Earth. Would you still always see the same side of the moon from Earth? *PLEASE HELP ME WITH THIS QUESTION*
  16. earth

    The weight of a large animal is 120 kg on earth , what is the weight on the moon with one-sixth the gravity of the earth ?
  17. Science physics

    what will be the acceleration due to gravity at up planet whose mass is 8 times the mass of the earth and whose radius is twice that of the earth? g=10
  18. physics

    A 80 kg man weighs 784 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 15% of his body weight?
  19. Physics

    Explain how redioactive decay has always warmed the Earth from the inside and how nuclear fusion has always warmed the Earth from the outside.
  20. Science

    The waves that are used have to go deep into the earth. Can Love and Raleigh waves be used for the purpose of mapping the interior of earth? Why or why not?
  21. physics

    Which of these three produces a greater tidal effect on you right now—the moon, the Earth, or the sunA) The sun.B) The Earth.C) The moon.
  22. phsics

    A 75 kg man weighs 735 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 15% of his body weight?
  23. Physics

    how many kilometers would you have to go above the surface of the earth for your weight to decrease to half of what it was at the surface? I know that the mass of earth is 5.97 x 10^24 kg do i have to convert it to km ??
  24. Physics

    At what height above the earth's surface. the acceleration due to gravity will be 1/9th of its value at the earth's surface. Re = 6400km
  25. Phsyics

    Determine the magnitude and direction of the gravitational force exerted a) on the Moon by Earth and b) on Earth by Moon.
  26. physics

    An Australian emu is running due south in a straight line at a speed of 16.9 m/s and slows down to a speed of 13.9 m/s in 3.5 s. Assuming that the acceleration remains the same, what is the bird's velocity after an additional 2.0 s has elapsed? (Assume
  27. physics force

    A positively charged rod is held near, but not touching, a neutral metal sphere. does the sphere experience a net force? if so, what direction/ I think the sphere has a net force to the left because since the sphere is neutral, it will have same number of
  28. Math

    Carlos and Krystal are taking a road trip from Greenville to North Valley.Each has their own map,and the scales on their maps are different. A. On Carlos's map,Greenville and North Valley are 4.5 inches apart. The scale on his map is 1 inch = 20 miles. How
  29. physics

    The summit of a mountain, 2550 above base camp, is measured on a map to be 4880 horizontally from the camp in a direction 35.4 west of north. Choose the axis east, axis north, and axis up.
  30. vectors

    The summit of a mountain, 2075 m above base camp, is measured on a map to be 4585 m horizontally from the camp in a direction 32.4° west of north. Choose the x axis east, y axis north, and z axis up. What are x, y, and z?
  31. Science Question PLEASE ANSWER QUICK! :D

    27. What is the function of the astmosphere's ozone layer? A. shields Earth from harmful solar radiation B. provides the oxygen needed by human life C. protects Earth from sun's heat*** D. removes pollution from the atmosphere *** = What I think is the
  32. AP US History

    The South Carolina Crisis of 1832-1833 resulted in a. a clear victory for the federal government or d. unanimous support in South Carolina for nullification The following, except one, were important manifestations of anti-foreignism in the 1850's: a. the
  33. physics 213

    A duck has a mass of 2.80 kg. As the duck paddles, a force of 0.120 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.190 N in a direction of 48.0 ° south of east. When these forces begin to act, the velocity
  34. Physics HELP!

    An airplane flies due north at 240 km/h with respect to the air. There is a wind blowing at 75 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground? __?__km/h __?__° east of north
  35. Science/Math

    A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location? The textbook that included the word problem is:
  36. Calculus

    Ship A is moving east at 20 miles per hour, while ship B is moving north at 15 miles per hour. At noon ship A was 5 miles east of an island, and ship B was 75 miles south of the island. At what rate is the distance of the ships changing at 1 pm?
  37. Math

    Every moment of every day, light pours out from the Sun at the center of our solar system and travels to Earth. It does not arrive at Earth instantaneously though; it takes time to get here. Your task is to figure out how long it takes for light to travel
  38. Chemistry

    Name an element that has 5 electrons in the third energy level. How do i determine the third energy level Row three on the periodic table is third energy level If memory serves me will, it begins with sodium. Ok. iS Krypton the electron configuration that
  39. Physics

    the weight of the body on the surface of earth is 392N what will be the weight of this body in another body whose mass is double of earth mass and radius is fourth multiple of earth radius?
  40. math

    two look out situations, which are 25 miles apart along the coast on a north-south shoreline, spot an approaching yacht. One lookout station measures the direction to the yacht at N33 degrees E, and the other station measures the direction of the yacht at
  41. trigonometry

    2. two look out situations, which are 25 miles apart along the coast on a north-south shoreline, spot an approaching yacht. One lookout station measures the direction to the yacht at N33 degrees E, and the other station measures the direction of the yacht
  42. physics

    Two vehicles with the same mass collide and lock together traveling 28 m/s at 37 degrees north of east after the collision. How fast was the car traveling that was heading north while the other vehicle was traveling east?
  43. physics

    Two vehicles with the same mass collide and lock together traveling 28 m/s at 37 degrees north of east after the collision. How fast was the car traveling that was heading north while the other vehicle was traveling east?
  44. Physic

    A force of 10N act on a object making 30 degree angle north of east and another force of 20N act on it along north. Calculate resultant force and it's direction ?
  45. math

    A ferry boat operator is required to drive directly to the opposite side of the river (starting at south side of river is A and the north side of river is B where boat will end up) but does not know where to point the nose of the boat. The river is flowing
  46. Algebra 2

    A car enters a interstate highway 15 mi north of the city. The car travels due north at an avrage speed of 62.5 mph. Write an equation to model the car's distance from the city after traveling for h hours.
  47. math

    What's the minimum. length of the arc on the cicumference of the earth,where a curvature of the horizon is appearent? OR---What's the max.length of cord,drawn on the cicumference of the earth,where length of the cord appears same as arc? Follow up 2nd
  48. U.S History

    Which of these describes the location of the Gulf of Mexico? A. South of West Florida B. East of East Florida C. West of New Orleans D. South of Great Britain I think its A.
  49. physics

    A 910 kg sports car slows down to 6.0 m/s to read a cross street sign. The 1440 kg pick-up truck following the sports car fails to see that the sports car has slowed and continues traveling at 17.0 m/s. The pick-up slams into the sports car. With what
  50. 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
  51. Astronomy

    A roughly spherical asteroid with a diameter of 1 km, and a mean density of 4 g/cm^3, hits the Earth with a relative speed 1.5 times the orbital velocity of the Earth. Compute the amount of energy released upon the impact. Compare that with the energy
  52. physics

    A boat is traveling on a bearing of 25 degrees East of North at a speed of 4 knots (a knot is 1.852 km/h). After traveling for 3 hours, the boats heading is changed to due South and it travels for an additional 2 hours at 5 knots. Using a Vector diagram,
  53. 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
  54. social studies { somebody please help me please

    What countries were members of the central powers in WW1? A. Austria-Hungary, Germany, Turkey*** B. France, , Germany, Russia C. France, Great-Britain, Russia D. Great-Britain, United States, Turkey 2. What caused the U.S to enter WW1 after 3years of
  55. Physics

    Suppose that the ratio of the Moon's mass to the Earth's mass is given by 1.200E-2 and that the ratio of the Moon's radius to the Earth's radius is given by 2.700E-1. Calculate the ratio of an astronaut's Moon-weight to Earth-weight. Now it seems like this
  56. Ag Bio 1

    In general, greater biodiversity exists closer to Earth's equator than in areas closer to Earth's poles. What does this mean in terms of the number of species that are found in these regions? Please help, they might as well have been speaking Japanese D:
  57. physics

    An airplane is flying above the Earth's surface at a height of 10.5 km. The centripetal acceleration of the plane is 16.4 m/s2. What is the angular velocity of the plane moving in uniform circular motion? Take the radius of the earth to be 6400 km.
  58. earth - website

    I would love my 4th grade students to explore a fun website about the earth and/ or other planets. Do you know any fun and interesting websites that my kids would enjoy exploring while learning about their planet earth.
  59. college physics

    A new planet has been discovered that has a mass one-tenth that of Earth and a radius that is one-sixth that of Earth. Determine the free fall acceleration on the surface of this planet. Express your answer in the appropriate mks units.
  60. physics

    An airplane is flying above the Earth's surface at a height of 9.30 km. The centripetal acceleration of the plane is 18.2 m/s2. What is the angular velocity of the plane moving in uniform circular motion? Take the radius of the earth to be 6400 km.
  61. Physics

    A communcations satellite of mass 200kg is in circular orbit of radis 4x10^4 km measured from the center of the earth. What is the gravitational force on the satellite and what fraction is this of its weight on the surface of the earth?
  62. Physics

    An airplane is flying above the Earth's surface at a height of 10.9 km. The centripetal acceleration of the plane is 16.7 m/s2. What is the angular velocity of the plane moving in uniform circular motion? Take the radius of the earth to be 6400 km.
  63. pre calc

    an earth satellite in circular orbit 1250 kilometers high makes one complete revolution evry 90 min. What is it linear speed? use 6400 kilometers for the radius of the earth.
  64. algebra

    Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets,
  65. algebra

    Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets,
  66. Math

    Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets,
  67. college

    Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets,
  68. math 117

    Can some help me with this appendix please. Thank you Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the
  69. Hey!!!

    Can you help me find out about slavery in South America????? Please!!! I found this on google. Perhaps it will help. http://www.iabolish.com/slavery_today/country_reports/continent_sa.html
  70. Physical science

    If 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
  71. U.S. History to 1865

    I have looked for this in my reading and could not find an answer so could you please help? Describe the lifestyles of early North American men and women. Thanks.
  72. maths

    Awoman walks 4km east and then 8km north use the polygon method to find her resultant fisplacement
  73. physics

    a man walks 8km North and then 5km in a. direction 60degrees. find its distance from his starting point
  74. physics

    An astronaut is traveling in a space vehicle moving at 0.520c relative to the Earth. The astronaut measures her pulse rate at 74.0 beats per minute. Signals generated by the astronaut's pulse are radioed to the Earth when the vehicle is moving in a
  75. physics

    An astronaut throws a wrench in interstellar space. How much force is required to keep the wrench moving continuously with constant velocity? Select one of the options below as your answer: A. a force equal to its weight on Earth B. a force equal to zero
  76. physics

    Earthquakes are motions of the earth's crust. Essentially, they are big sound waves that travel through the earth. There are two types of waves. The first type is called a longitudinal or P wave, where the earth compresses in the same direction as the wave
  77. Physics

    Los Angeles (32 degrees North, 119degrees West) and Atlanta (33 degrees North, 84 degrees West) are approximately at the same latitude but not longitude. If a crow were to fly between the two cities what is the approximate shortest flight distance in
  78. Physics

    Aperson walks37.7◦ northofeast for 3.54km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk?
  79. physics

    A car is driven east for a distance of 45 km, then north for 33 km, and then in a direction 32° east of north for 22 km. Determine the total displacement of the car from its starting point (counterclockwise from east).
  80. physic's problem

    GPE = MASS X GRAVITY X HEIGHT GRAVITY IS ALWAYS 10 M/S 2 (SQUARED) KE = 1/2 X MASS X SPEED 2 (SQUARED) I am uncertain what your question is. As a matter of interest, the value of 10m/s^2 for the acceleration of gravity is in error, in fact, it is never
  81. 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
  82. English Check my answers please

    1. In “Raymond’s Run,” which detail supports the prediction that Squeaky will not let Gretchen win the race? (1 point) I put * marks by ones I thought Squeaky is insulted when Mr. Pearson suggests she give someone else “a break” this year.
  83. Physics

    Please help The year is 2115. There is a high jump competition on planet Mars. An athlete of mass 72 kg who has been clearing a height of 2.44 m on Earth just the week before is competing here. What is the height this athlete can expect to clear in this
  84. Physics

    The equation describing the (r, \theta ) coordinates of points along a single field line of a magnetic dipole is r=R_0 \sin ^2(\theta ) where \theta =0 is in the direction of the dipole moment and R_0 is a constant which is different for each field line.
  85. physics

    Equivalent forces derivation problem. EXAMPLE: Derive the formula for F3 in terms of the experimentally measured quantities m1, m2, 1, and 2. [Answer: F3=m1gcos1+m2gcos2.] Make sure you understand how this formula was derived. QUESTION: If the mass of both
  86. Chem

    Define isoelectronic series. Put the K+, Ca2+, Cl-, and Ar ions and atoms in order of increasing size and explain the trends. Count the number of electrons for each atom Then, explain the (column) size trend for Mg2+ versus Ca2+ ions Is the order cl k ca
  87. Geography

    Where on Earth? You work for a company that specializes in environmental cleanup. Your company has been approached by representatives of several Eastern European governments. They want to clean up the Danube River and are asking companies in the United
  88. astronomy

    Mars has a mean density less than the mean density of the Earth's mantle. How is it possible that Mars could have a metallic core given this fact? Hint: No calculations are required. Compare the densities used in part a) with the density of mantle rocks
  89. Science

    If a ball A moves at X speed eastwards collideds with a stationary ball B. Ball A now moves at Y speed north east (40 degrees upwards from eastward direction) and ball B moves at W speed south east (50 degrees downwards from eastward direction). To
  90. Science

    If a ball A moves at X speed eastwards collideds with a stationary ball B. Ball A now moves at Y speed north east (40 degrees upwards from eastward direction) and ball B moves at W speed south east (50 degrees downwards from eastward direction). To
  91. Physics

    A person walks 15.0° north of east for 3.70 km. How far due north and how far due east would she have to walk to arrive at the same location?
  92. physics

    A person walks 11.0° north of east for 3.30 km. How far due north and how far due east would she have to walk to arrive at the same location?
  93. Physics

    A person walks 23.0° north of east for 2.60 km. How far due north and how far due east would she have to walk to arrive at the same location?
  94. physics

    An object has a velocity of 5.00 m/s at an angle of 30.0˚ north of east. If we define east as the +x direction and north as the +y direction, what is the magnitude of vy?
  95. Physics

    You are on a treasure hunt and your map says "Walk due west for 52 paces, then walk 29.6° north of west for 40 paces, and finally walk due north for 25 paces." What is the magnitude of the component of your displacement in the following directions? (a)
  96. math

    Carrie and Krystal are taking a road trip from Greenville to North Valley . Each person has her own map,and the scales on the map are different. A.On Carrie's map, Greenville and North Valley are 4.5 inches apart.The scale on her map is 1 inch=20 miles.
  97. Physics

    I know how to do displacement, I just get confused by the directions. I walk 6 blocks east and 5 blocks north-I come up with 7.8 because I squared 6 + squared 5 and took the square root of 61 but do I say the final displacement is 7.8 blocks east of north
  98. trig

    Two pilots take off from the same airport. Mason heads due south. Nancy heads 23º west of south. After 400 land miles, how far is Nancy from Mason’s route? Round your answer to the nearest tenth of a mile. (Enter only the number.)(If someone had helped
  99. reading

    Examine the evidence of the Earth's shape. The sharp horizon at first suggests a flat Earth with an edge. But as you walk toward the horizon, the "edge" recedes ahead of you, implying that the Earth's surface is curved. Look also at a ship sailing out to
  100. mathematics on sports

    can anyone provide me with some sources which has information on how mathematics has been used on sports? e.g., trig can help to calculate the best angle to throw a ball or something, the speed of running can affect the height of high jump etc. etc.? any