1. Physics

    A man has a mass of 80kg on the Earth's surface. Part A How far above the surface of the Earth would he have to go to "lose" 13% of his body weight?
  2. Physics

    calculate the escape velocity on the surface of earth, acceleration due to gravity will be 36 percent of its value on the surface of earth .if mean radius is 6400 km?
  3. Physics

    The rate of motion of the earth at its equator is about 1,038 mi/h because of its rotation. From this information, estimate the earth's circumference using an order-of-magnitude estimate.
  4. physics

    a 70 kg block rests on the earth's surface. How much energy is required to move the block very far from the earth, ending up at rest again?
  5. Science

    Suppose the moon rotated on its axis just as quickly as earth. Would you still see the same side of the moon from earth? Please help!
  6. Science , Earth , Waterce , Earth , Waterce

    How can I answer this question? Draw an overall conclusion: how does water compare to other substances? Why do you think so? Please help me...
  7. 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
  8. Science

    What are 2 processess that change earth slowly? The ___1____, which includes the__2____ and part of the _____3_____, is divided into plates that carry all of the Earth's lands and oceans. These plates float on a ___4____ layer of rock in the upper mantle called the ___5__. THe...
  9. English

    Can you check these sentences, please? In particular, let me know if the words occurring before the parentheses are OK. 1) Jane Austen disapproves of relationships based only on wealth or on sudden violent passions.According to her, a good marriage should be based on calm ...
  10. tax

    In order for an employee to deduct home office expenses, which of the following must occur? a. There must be no other fixed business location. b. The taxpayer's most important activities must occur in the home. c. The home office must be for the convenience of his or her ...
  11. Physics (pressure)

    What is the total mass of the earth's atmosphere? The radius of the Earth is 6.37E6 m, and atmospheric pressure at the surface is 1.013E5 N/m^2 (or Pa). I tried this: 1.013E5 Pa = Mg/ pi(6.37E6)^2 1.013E5 Pa (denominator)= 9.8 M solve for M: I'm coming with different ans from ...
  12. Math

    Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do not neglect ...
  13. physics

    Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do not neglect ...
  14. modern physics

    Missiles are fired towards the earth from a spacecraft. The missiles are moving with a speed of 0.8c with respect to the spacecraft. If the spacecraft itself has a speed of 0.3c with respect to Earth, how fast are the missiles observed to travel with respect to Earth? What ...
  15. modern physics

    Missiles are fired towards the earth from a spacecraft. The missiles are moving with a speed of 0.8c with respect to the spacecraft. If the spacecraft itself has a speed of 0.3c with respect to Earth, how fast are the missiles observed to travel with respect to Earth? What ...
  16. Physics questoin

    A satellite has an orbital radius of 3.74x10^7 m. If it has a period of 49776 seconds, what is the mass of the planet?
  17. math

    Describe all the points on the Earth’s surface that are exactly 4000 miles from the North Pole. If you need to, use 3960 miles for the radius of the Earth.
  18. math

    Describe all the points on the Earth’s surface that are exactly 4000 miles from the North Pole. If you need to, use 3960 miles for the radius of the Earth.
  19. space

    What is the value of g for space-shuttle territory , about 200km above the Earth's surface. Data: Earth's mass is 6x10^24kg, and radius is 6380 km
  20. Physics

    The average distance separating earth and moon is 384000 km. What is the net gravitational force exerted by earth and moon on a 3.00 * 10^4 kg spaceship located halfway between them.
  21. physics

    Calculate the force needed to accelerate a 1 kg ball by 3 m/s: a. in space along way from the earth. b. on the ground in a direction horizontal to the ground. c. on the earth vertically upward.
  22. geometry

    The radius of the earth is approximately 6371 km.If the international space station (ISS) is orbiting 353 km above the earth, find the distance from the ISS to the horizon(x)
  23. Physics

    The height of the sun from point A is larger than from point B by 4.92 degree.If the distance between A and B is 500 Km, How long is the circumference of the earth? ( assume that earth is perfect sphere)
  24. earth science

    one reason the moon might be a better place than earth to study the universe is there is almost no atmosphere. True or False MY guess is false
  25. math

    Describe the points on the earth’s surface that are visible to a viewer who is 100 miles above the North Pole. Would it be half of the surface area of Earth?
  26. Physics/Dynamics

    A truck has wheels of diameter 0.9m, a weight of 8000kg, a wheel-base of 4m, and a tray height of approximately 1.2m. The truck’s weight distribution is 50% on the rear wheels and 50% on the front wheels. The truck’s front springs have a combined stiffness of 550,000 N/m, ...
  27. maths calculus

    A centre enters students for English levels one and two end test every year. Some take the paper based version, others online version. For planning purposes you need to assume trend patterns indicate that .the total number of entries each year is always more than 50 .the ...
  28. earth science

    Traditionally,how have different fields of earth science been studied?
  29. physics

    A pendulum has a period of 0.57 s on Earth. What is its period on Mars, where the acceleration of gravity is about 0.37 that on Earth?
  30. phy

    A pendulum has a period of 0.75 s on Earth. What is its period on a planet where the acceleration of gravity is about 0.41 that on Earth?
  31. PHYSICS

    does the sun exert a gravitational force on the earth? if so, why doesn't the earth fall into the sun?
  32. Math

    An ant weighs about 2 x 10^-5 lb. There are about10^15 ants on earth. How many pounds of an ants are on earth?
  33. physics

    could you estimate the mass of the entire earth? How? If we cannot direct measure the earth's mass, how was it determined?
  34. Physics

    A pendulum has a period of 0.70 s on Earth. What is its period on a planet where the acceleration of gravity is about 0.31 that on Earth?
  35. Physics

    Calculate the force of gravity on a 2 kg mass at Earth’s surface. The mass of Earth is 6 * 10 ^24 kg, and its raidus is 6.4 * 10 ^ 6.
  36. physics

    Calculate the force of gravity on a 1 kg mass at Earth's surface. The mass of Earth is 6.0×10^24 kg , and its radius is 6.4×10^6 m.
  37. physics

    A pendulum has a period of 0.70 s on Earth. What is its period on a planet where the acceleration of gravity is about 0.51 that on Earth?
  38. physics

    an object weighs 3 lb. at 10 earth radii from its center. What is the object's weight on the earth's surface?
  39. Physics

    A pendulum has a period of 4.28 s on Earth. What is its period on Mars, where the acceleration of gravity is about 0.37 that on Earth?
  40. physics

    A pendulum has a period of 0.90 s on Earth. What is its period on a planet where the acceleration of gravity is about 0.29 that on Earth?
  41. scince

    Mars=750N the value of g is 38% of that of earth what is the mass of the men on the earth and his weight of mars
  42. Physics

    The velocity of the Moon relative to the center of the Earth can be approximated by varrowbold(t) = v [−sin (ωt) xhatbold + cos (ωt) yhatbold], where v = 945 m/s and ω = 2.46 multiplied by 10−6 radians/s. (The time required for the Moon to complete ...
  43. Precalculus

    Can someone check my answers please? Thank you :) 30. What is Earth's rotational speed at (a) Bangor, Maine (latitude 45 degrees N) and (b) Rio de Janeiro, Brazil (latitude 23 degrees S)? (It's given in the problem also that Earth's rotational speed at the equator is about 1,...
  44. science

    Scientists believe that Earth's early atmosphere changed in composition as a result of a. the appearance of oxygen-producing organisms b. the drifting of the continents c. the changes in Earth's magnetic field d. a transfer of gases from the Sun
  45. Physics

    How long would it take for the Earth to complete a full turn if a person at 49.2° northern geographical latitude floats apparently weightlessly across the room? Use REarth = 6,385 km for the radius of Earth
  46. physics

    How long would it take for the Earth to complete a full turn if a person at 24.1° northern geographical latitude floats apparently weightlessly across the room? Use REarth = 6,375 km for the radius of Earth. Thank you
  47. physics

    A rocket is fired straight up through the atmosphere from the South Pole, burning out at an altitude of 208 km when traveling at 5.8 km/s. (a) What maximum distance from Earth's surface does it travel before falling back to Earth?
  48. physics

    How long would it take for the Earth to complete a full turn if a person at 56.4° northern geographical latitude floats apparently weightlessly across the room? Use REarth = 6,385 km for the radius of Earth.
  49. math

    How long would it take for the Earth to complete a full turn if a person at 43.8° northern geographical latitude floats apparently weightlessly across the room? Use REarth = 6,390 km for the radius of Earth.
  50. physics

    How long would it take for the Earth to complete a full turn if a person at 49.2° northern geographical latitude floats apparently weightlessly across the room? Use REarth = 6,385 km for the radius of Earth
  51. Physics

    How long would it take for the Earth to complete a full turn if a person at 49.6° northern geographical latitude floats apparently weightlessly across the room? Use REarth = 6,384 km for the radius of Earth.
  52. Physics

    How long would it take for the Earth to complete a full turn if a person at 32.6° northern geographical latitude floats apparently weightlessly across the room? Use REarth = 6,384 km for the radius of Earth.
  53. physics

    You stand on the seat of a chair and then hop off. During the time you are in flight down to the floor, the Earth is lurching up toward you with an acceleration a. If your mass is 52 kg, what is the value of a? Visualize the Earth as a perfectly solid object.
  54. Earth Science

    Computer models of Earth's climate project increases in the average temperature from 2°C to 6°C by the end of the century. Have these high temperatures ever occurred before in the past 400 000 years?
  55. Earth's Dynamic Atmosphere

    Because scientists were so puzzled by the phenomenon of energy through the vacuum of space, what did they call the material they assumed existed between the Earth and the Sun? A. Ether B. Sciosphere C. Plasma D. Albedo my answer is a.
  56. college algebra

    The diameter of the Earth is approximately 7,920 miles. Given that the circumference of a circle is pi times its diameter, which statement best describes the length of a trip from Washington to Masdagascar that is approximately 8,600 miles long? a.One fourth of the ...
  57. 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 C. a force equal to ...
  58. MATH HELP

    Law of Gravitation- Find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is neglected. The gravitational constant for g is, G = 6.67428*10^-11 m^3 Kg^-1 s^-2 Please answer the question fully ...
  59. Physics

    Suppose that the magnetic field o fthe Earth were due to a single current moving in a circle of radius 2988 km through the earth’s molten core. The strength of the Earth’s magnetic field on the surface near a magnetic pole is about 6.00E-5 T. About how large a current ...
  60. physics

    The earth spins on its axis once a day and orbits the sun once a year (365 1/4 days). Determine the average angular velocity (in rad/s) of the earth as it (a) spins on its axis and (b) orbits the sun. In each case, take the positive direction for the angular displacement to be...
  61. English

    1. The earth moves round the sun. 2. The Earth moves round the sun. 3. Earth moves round the sun. 4. The earth moves round the Sun. [Which ones are okay? Do we have to use 'the' in #2 or #3? What about #4? "the Sun?"]
  62. physics

    CRITICAL THINKING: The term ”weight” in physics has the following very specific meaning: “The weight of an object is the name given to a particular force: the gravitational force exerted by the earth on the object, giving it an acceleration of 9.8 m/s2 near the surface ...
  63. physics

    CRITICAL THINKING: The term ”weight” in physics has the following very specific meaning: “The weight of an object is the name given to a particular force: the gravitational force exerted by the earth on the object, giving it an acceleration of 9.8 m/s2 near the surface ...
  64. physics

    magine a straight line connecting the centers of the earth and the moon. At some point along this line the gravitational forces pulling a spacecraft towards the moon and towards the earth exactly balance each other, and the craft could just sit there in (an unstable) ...
  65. engineering

    In many engineering uses, the value of �g�, the acceleration due to gravity, is taken as a constant. However, g is actually dependent upon the distance from the center of the Earth. A more accurate expression for g is: g=g0(Re/Re+A)^2 Here, g0 is the acceleration...
  66. Physics

    It has been suggested that cylinders rotating about their long axis with dimensions 19 km long and 6.9 km in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall ...
  67. Physics

    The earth spins on its axis once a day and orbits the sun once a year (365 1/2 days). Determine the average angular velocity (in rad/s) of the earth as it (a)spins on its axis and (b) orbits the sun. In each case, take the positive direction for the angular displacement to be ...
  68. Astronomy

    In the laboratory, an atom emits a spectral line at a wavelength of 400 nanometers. In the spectrum of a star, the same spectral line is found to have a wavelength of 410 nanometers. What can be said about the star? a. It is hotter than the Sun. b. It is moving toward the ...
  69. science

    Why is the earth round? Why is the water blue? Why doesn't the water fall off the earth? the earth is not perfectly round, water is blue because particles reflect blue light. The water cycle, type that in and google it to find out for yourself. I'd give u the link to the site ...
  70. earth

    A helicopter is ascending vertically with a speed of 4.00 m/s. At a height of 185 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?
  71. space

    gowing 10,00 miles per hour how long will it take to get to jupiter from earth with earth the sun and jupiter alined like a straight line or just an estimation
  72. physics

    I need help finding an equation for: an asteroid revolves around the sun with a mean orbital radius twice that of Earth's. Predict the period of the asteroid in Earth years. Thank you.
  73. Physics

    Calculate the force on an electron (qe = -1.6 x 10-19 C) in each of the following situations: a.) moving at 2.0% the speed of light and perpendicular to a 3.0 T magnetic field b.) 3.0 x 10-6 m from a proton c.) in Earth's gravitational field at the surface of Earth
  74. Physics

    Calculate the force on an electron (qe = -1.6 x 10^-19 C) in each of the following situations: a.) moving at 2.0% the speed of light and perpendicular to a 3.0 T magnetic field b.) 3.0 x 10^-6 m from a proton c.) in Earth's gravitational field at the surface of Earth
  75. physics

    A 5.9-kg rock and a 3.0 10-4-kg pebble are held near the surface of the earth. (a) Determine the magnitude of the gravitational force exerted on each by the earth.(b) Calculate the magnitude of the acceleration of each object when released.
  76. Physics

    On a cloudless day, the sunlight that reaches the surface of the earth has an intensity of about 1.2 103 W/m2. What is the electromagnetic energy contained in 6.4 m3 of space just above the earth's surface?
  77. 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*
  78. 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*
  79. physics

    Two electrons are placed; one at north pole and other at south pole of earth. Find the force between them. Given diameter of earth= 12800 km.
  80. math and science

    A space shuttle with a mass of 4,06 X 10kg,orbits earth at a height of 720km above the surface of the earth.calculate the gravitational force experienced by the shuttle
  81. Science---Hurry Please Help!

    If Earth were located where Mars is in space, the temperature of Earth would A) be significantly higher. B) be significantly lower. C) be about the same. D) fluctuate greatly. B maybe?
  82. physics help please

    A recently discovered planet has a mass twice as great as Earth's and a radius twice as large as Earth's. What will be the approximate size of its gravitational field? Apparently it isn't 2 * 9.8...
  83. Physics

    About 5.12 x 104 m above Earth's surface, the atmosphere is sufficiently ionized that it behaves as a conductor. The Earth and the ionosphere form a giant spherical capacitor, with the lower atmosphere acting as a leaky dielectric. Find the capacitance C of the Earth-...
  84. physic

    1 A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true? The passenger is in motion relative to the passer-by The passer-by is stationary relative to the passenger Both ...
  85. phy

    A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true? The passenger is in motion relative to the passer-by The passer-by is stationary relative to the passenger Both ...
  86. physics

    passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true? The passenger is in motion relative to the passer-by The passer-by is stationary relative to the passenger Both observers ...
  87. physics

    1 A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true? The passenger is in motion relative to the passer-by The passer-by is stationary relative to the passenger Both ...
  88. science

    How do the moons stay in orbit around Jupiter?
  89. physics

    how the moons stay in orbit around jupiter ?
  90. Chemistry

    What is the difference between and orbit and an electron orbital?
  91. Physics

    Whats the speed of an electron of Bohr's orbit K
  92. Physical Science

    How does gravity help keep satellites in orbit?
  93. astronomy

    If the planet is in an edge-on orbit, what would its mass be (in kg)?
  94. Biology

    Which of the following must occur for a plant or animal to grow and develop normally? a) Sufficient oxygen must be available to stimulate cell division. b) Theorganism must recive a supply of the appropriate horones from its parents. c) It must be able to control the timing ...
  95. Calculus

    An air ambulance is travelling from Barrie to Toronto. Toronto is located 90 km [S5°E] of Barrie. If the wind is blowing from the South with a velocity of 62 km/h, and the plane’s air speed is 375 km/h, what direction must the pilot fly to make it to Toronto? What on earth ...
  96. science help pls pls

    The table below shows the average distances of Jupiter and Earth from the sun. Name of Planet Average distance from the sun (in AU) Jupiter 5.2 Earth 1.0 What is the difference between the orbital periods of Jupiter and Earth? 4.20 years 6.20 years 8.86 years 10.86 years 12.40...
  97. 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 direction perpendicular to ...
  98. Physics

    A satellite orbits at an average altitude of h = 409 km. What is its orbital speed? Use REarth = 6370 km and mEarth = 5.98 x 10^24 kg
  99. physics

    A satellite orbits at an average altitude of h = 409 km. What is its orbital speed? Use REarth = 6370 km and mEarth = 5.98 x 10^24 kg
  100. physics

    How long would it take for the Earth to complete a full turn if a person at 27° northern geographical latitude floats apparently weightlessly across the room? Use REarth = 6,379 km for the radius of Earth. Help me please!
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