1. physics repost

    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

    asked by Jon on April 3, 2008
  2. English

    What does Asimov predict will happen to earth in billions of years? a. it will be burned up by the sun b. its population will increase c. it will shrink slightly in size d. it will change position in the galaxy*****

    asked by Ms. Sue?! please help on November 18, 2015
  3. Physical Science

    1. In which of the following units is acceleration expressed? *A. Newtons B. Foot-pounds C. Kilograms D. Meters per second squared 2. A stone falls from a ledge and takes 16 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall

    asked by Lizzy on September 26, 2011
  4. Physics - solar power in space

    Hi, this requires some basic knowledge of astrophysics. I missed last lecture that covered this, so though I'd prefer thorough solutions to these problems, I'd appreciate it even if you could tell me which formulas to use to solve each part of the problem.

    asked by Mark on March 4, 2009
  5. math

    I'm having trouble determining when you divide and when you multiply to solve a scientific notation problem. For example: Assume that there are 20,000 runners in the New York City marathon. Each runner runs a distance of 26 miles. If you add together the

    asked by Sami on July 18, 2018
  6. science

    Suppose a new drill could reach twice as far in the earth's crust as a drill can today. How would this affect rocks?

    asked by Rod on September 19, 2011
  7. Science

    How can scientists use the geologic time scale by sequencing the events of the earth in a time line?

    asked by M. on March 6, 2012
  8. earth

    if a person's mass is 50 kilograms approximately how much force is exerted on the person at earth surface

    asked by force on May 31, 2011
  9. Physics

    If an astronaut in full gear has a weight of 1150 N on Earth, how much will the astronaut weigh on the Moon?

    asked by C Johnson on February 28, 2012
  10. Physic

    How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the Earth) of one of the protons?

    asked by Asiay on January 27, 2014
  11. physics

    A body has mass 400kg on earth. What will be it mass on the moon if the Acceleration due to gravity is 9.8m/s2?

    asked by Nyame Godfred on January 22, 2016
  12. Science Help

    mass = 4.5 kg Compare and contrast the mass and weight of this bowling ball on Earth and the moon.

    asked by Cj on May 21, 2013
  13. physics

    a pendulum is 0.75 meters long and has a period of 4.17seconds is this pendulum on the earth moon or mars?

    asked by nikq on February 18, 2015
  14. Enviro Science

    Describe the diversity of species on Earth, relating the difference between known numbers and estimated numbers Thanks -MC

    asked by mysterychicken on April 24, 2012
  15. chemistry

    When brought to the surface of the moon, will a mass have more or less weight than it did on the surrface of the earth, or will it be the same weight? explain

    asked by Anonymous on September 19, 2010
  16. physics

    If you could travel with speed of light (3.0E5 km/s) it would take only 1.3 seconds to reach Moon. How far is Moon from Earth?

    asked by elda on September 13, 2014
  17. math

    the steps to a math quiz. the earth rotates once every 23 hours 36 minutes 4 seconds.how many seconds is that?

    asked by luzia on October 16, 2009
  18. Social Studies

    There are 8 languages on he peace pole that all state "may pece prevail on earth" what languages are used? I need help on this plz help thank u

    asked by Laruen on December 6, 2011
  19. physical science

    At the bottom of a well one quarter of radius of the earth deep your weight compare to your normal weight would be

    asked by tam on March 1, 2011
  20. Physics (please help!!!!)

    Derive the rocket equation M(dV/dt) = -u(dM/dt)for a rocket in the (constant) gravitational field near the surface of the Earth.

    asked by Eduardo on March 7, 2011
  21. phscal sicence

    If an astronaut in full gear has a weight of 1150 N on Earth, how much will the astronaut weigh on the Moon?

    asked by C Johnson on February 28, 2012
  22. Science

    How can scientists use the geologic time scale by sequencing the events of the earth in a time line?

    asked by M. on March 6, 2012
  23. math

    the scientific notatio of velocity of light velocity of sound distance between the sun and earth

    asked by amulya on December 17, 2015
  24. Physic II

    How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the Earth) of one of the protons?

    asked by Gugubi on January 26, 2014
  25. Science

    If the moon rotated on its axis just as quickly as Earth's, would we always see the same side of the moon? Explain. -thanks, Sandra

    asked by Sandra on February 19, 2011
  26. Physics

    An astronaut on earth has a weight of 850 N calculate his weight on the moon where the gravity is 5 times less

    asked by JAm on November 27, 2017
  27. physics

    The force of gravity on a box is 597 N on the surface of the Earth. Find the mass of the box.

    asked by Nicholis on October 14, 2015
  28. physics

    If a mole of atoms were spread uniformly over the surface of the Earth, how many atoms would there be per square meter?

    asked by wong on September 23, 2009
  29. mechanics

    at what altitude above the earth's surface is the free fall acceleration equal to three quarters of its value at the surface ?

    asked by aliza on April 3, 2011
  30. physics

    how much work is required to lift a 10 newton weight from 4.0 meters to 40.0 meters above the surface of earth

    asked by abu on February 15, 2011
  31. Physics

    The moon orbits 3.84 x 10^8m form the center of the earth. How fast does the moon travel in meters per second?

    asked by Charles on February 11, 2008
  32. physics

    How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the earth) of one of the protons? (

    asked by Anonymous on October 15, 2014
  33. physics

    An engine draws water from a depth of 10 m from earth at aspeed of 2m/s at arate of 10 kg/10 s. What is the power of the engine?

    asked by ritu on February 3, 2012
  34. physics

    A canoe has a velocity of 0.31m/s southeast relative to the earth. The canoe is on a river that is flowing

    asked by Anonymous on January 22, 2015
  35. Physics

    What would the weight of an object that is 4N on the earth be on the moon (acceleration due to gravity on the moon is 1.62m/s2?

    asked by Jeff on October 25, 2012
  36. maths

    Angle of elevation of sun from earth is called? (A) sunset (b) sun's altitude (c) sunrise (d) none

    asked by sanjay on February 25, 2017
  37. Science

    About 10 percent of the earth’s surface are covered with glaciers today. Where are most of these glaciers found

    asked by T-perry on March 26, 2013
  38. Geology

    I know that the earth quakes and shakes during a earthquake, but I do not understand how it moves. Can somebody explain how it moves?

    asked by A.W. on April 12, 2009
  39. astronomy/physics

    Use Newton’s Law of Gravity to calculate the force of gravity between a 39 kg person and Earth.

    asked by silvia on December 1, 2011
  40. 6th Grade Science - Help

    Which of Earth's spheres has the most mass? 1. atmosphere 2. hydrosphere 3. geosphere 4. biosphere Is it Biosphere?

    asked by Helena on April 5, 2014
  41. algebra

    earth tothe sun is 93000000 how many of you stacked on top of yourself would it take to reach the sun

    asked by lateek on November 9, 2010
  42. biology

    why is carbon so abundant in living things when oxygen is the most abundant element on earth

    asked by ciara on August 26, 2015
  43. physics

    On Planet Y, the value of g is 12 m/s/s. If the human weighs 685 N on this planet, then how much woud he weigh on earth?

    asked by Tony on September 12, 2012
  44. physics

    The natural greenhouse effect raises the surface temperature at the surface of the Earth by about 20 or 40 k?

    asked by jim on October 15, 2010
  45. math

    The Position of two A and B on the earth’s surface are (36°N, 49°E) and (36°N, 131°W ) respectively. (a) The difference in long between town A and town

    asked by kudu on February 26, 2015
  46. English

    Is this sentence correct? I sat down with him and helped him with the layers of the earth worksheet. Or do I need to take out the before layers

    asked by Thomas on February 13, 2011
  47. geography

    Into how many degrees of longitude is the Earth divided? My answer is 360 degrees. Am I correct?

    asked by Reed on September 12, 2011
  48. dynamics of rigid bodies

    prove that the weight of an object on the moon is approximately one-sixth of its weight on earth

    asked by Anonymous on December 4, 2012
  49. English

    In this sentence Plenty of silicon is found on Earth. I'm not sure if the simple predicate is is or is found.

    asked by Sylvie on October 28, 2008
  50. Physics

    1 m pendlum on Earth has a period of 2 s. What would it's period be on the moon where the acceleration due to gravity is 1.63 m/s2 ?

    asked by Aminah on April 8, 2016
  51. Physics

    (a)Compute the value of G at a point in space that is 7.0X10^6 m from the center of the earth. What will be the value of G at a point with a radius twice that in (a)?

    asked by Juan on November 15, 2009
  52. science

    when any spot on the surface of the earth faces the sun that spot is dark and it is night

    asked by stephani on June 8, 2011
  53. science

    what would be the temperature? hottest area on earth outside during spring outside during autumn body temperature

    asked by Fern on December 7, 2008
  54. Science

    Dingtu can lift a weight of 60 kg on the earth. How much will he be able to lift when on moon? A. 60 Kg B. 10 Kg C. 360 Kg D. 120 Kg

    asked by Abhinav Chandran on January 23, 2012
  55. earth

    A man with a weight of 1000 newtons on earth visits each planet what is his weight on each?

    asked by Anonymous on January 16, 2010
  56. Physics

    Find tha schwarzschild radius of tha earth ,whose mass 5.98×10^24kg

    asked by M salman on October 16, 2018
  57. science

    Sam weighs 720 N on earth and 120 N on the moon. What does this tell you about the value of gravity on the moon?

    asked by lauren on October 9, 2011
  58. earth

    sam weighs 720N on the earth and 120N on the moon.what does this tell you about the value of gravity on the moon?

    asked by Gemma on November 6, 2011
  59. science

    Compare the likelihood that an astronaut on Mars will be struck by meteoroid with its likelihood on earth.

    asked by Shirley on November 19, 2011
  60. Physics

    The acceleration due to gravity on Earth is 9.80 m/s2. If the mass of a dog is 40.0 kg, what is the weight of the dog?

    asked by Jane on April 18, 2014
  61. science

    when brought to the surface of the moon will a mass have more or less weight than it did on the surface of earth or stay the same ?

    asked by Blaire on October 8, 2010
  62. Science

    If you look at a map of Earth's Plate Tectonics, is the Pacific Plate moving North?

    asked by Angie on February 18, 2009
  63. physics

    a 70 kg astronaut is loaded so heavily that he can jump only to a height of 10 cm on earth.how far can he jump on the moon?

    asked by chingtham on March 14, 2013
  64. Physics

    The force on a 0.80 m wire that is perpendicular to Earth's magnetic field is 0.12 N. What is the current in the wire?

    asked by Crystal on February 24, 2011
  65. astronomy

    Retrograde motion describes the backward motion of the stars relative to earth

    asked by b on March 27, 2010
  66. Physics~

    The moon's gravity is one-sixth that of the earth. What is the period of a 0.25 m long pendulum on the moon?

    asked by Mary on December 21, 2014
  67. Science

    Does the tilt of the earth cause one hemisphere to be closer to the sun? True or false False.

    asked by LOVE on March 4, 2016
  68. Science

    By what factor would your weight change if the earth's diameter were doubled and its mass were also doubled? Thanks :)

    asked by Catherine on May 14, 2011
  69. Physics

    Calculate the angular and linear velocity of the surface of the sun and the earth around the sun.

    asked by Christina AAAA on April 7, 2009
  70. science

    if you weigh 100 pounds on earth than how much would you weigh on each other planet in our solar system

    asked by jack on February 14, 2011
  71. Scienc

    World poplation grow each year,does this mean the mass off earth increases each year? Why?

    asked by Nazharia Zehr on October 25, 2007
  72. science

    according to scientific hypothesis, how were earth's oceans formed? when do scientists hypothesiz they formed?

    asked by Nikki on April 6, 2009
  73. Grade 11 math

    A rocket carrying a weather satellite is launched. As it moves through space, the rocket is tracked by two tracking stations located 24 km. apart, beneath the rocket. The 2 tracking stations both lie west of the launching pad. at a specific moment, the

    asked by Mhy on April 28, 2011
  74. trig pls.. help me

    A rocket carrying a weather satellite is launched. As it moves through space, the rocket is tracked by two tracking stations located 24 km. apart, beneath the rocket. The 2 tracking stations both lie west of the launching pad. at a specific moment, the

    asked by Mhy on May 2, 2011
  75. Science help (just 4 questions)

    1. Which of the following is an example of an environmental pressure? (1 point) the air pressure in the atmosphere a lake that is gradually running out of water a fight between two members of the same species breeding between two members of the same

    asked by Miley23 on December 4, 2013
  76. physics

    A 3.3 kg brick is falling at a rate of 35.1 m/s toward the earth at a current height of 14 m. What is the total mechanical energy of the brick?

    asked by Anonymous on February 21, 2011
  77. Creative writing

    Does it make sense to say that someone was "spiraling towards the earth at breakneck speed" or should I pick a better word than spiraling? Any suggestions?

    asked by Millie on February 28, 2013
  78. 5th grade

    correct noun form please. bob know that he had to have the (earth's/earths) smell on him before the (horses/horses') would accept him.

    asked by cody on September 9, 2009
  79. Math

    On what day in the year 1943 was the earth 300 000 minutes old? (give the month and day)

    asked by Sandy on October 1, 2014
  80. physics

    It takes Pluto a longer time to travel around the sun than the Earth because Pluto: a. has farther to go b. goes slower c. a and b d. none of these

    asked by Claire on July 22, 2008
  81. geometry

    a globe of the earth measures 12 inches in a diameter. calculate the surface area and volume of this globe

    asked by Anonymous on March 17, 2011
  82. science

    water from the earths surface moves in the air by ? and becomes ?. evaporation, and becomes water vapour in the earth's atmosphere

    asked by bob on April 24, 2007
  83. Geometry

    how do you make a sketch of the earth, moon, and sun during a solar eclipse so that your sketch contains similar triangles?

    asked by Ariel on February 3, 2008
  84. ap enviromental

    for a very long time, prokaryotes were the only living creatures on earth. how long a period? i would appreciate a straight answer please!!!

    asked by gab on November 12, 2009
  85. Science

    How is the temperature of the Earth affected by factors controlling the balance between incoming radiation and radiation emitted...?

    asked by Naeha on June 20, 2017
  86. physics

    Rank the microtidal forces on your own body, from greatest to least, produced by the:A. JupiterB. PlutoC. Earth greatest to least.

    asked by jim on March 6, 2012
  87. Earth Science

    Which Scientific hypothesis for the Origin of Life on Earth is most widely accepted.? What evidence is there for the hypothesis? Need help. I'm just not how to go with the question.

    asked by JOY on November 30, 2011
  88. Science

    Describe the geomorphic processes that shape the Earth’s surface. Use the Yosemite Valley to explain one or more of those processes.

    asked by Kristy on April 5, 2013
  89. Science

    How does the position of Earth's axis at the March and September equinoxes compare to its position at the summer solstice?

    asked by Stephanie on March 17, 2013
  90. physics

    If a small planet were discovered whose orbital period was twice that of Earth, how many times farther from the Sun would this planet be?

    asked by Jon on May 9, 2015
  91. Chemistry

    The circumference of the earth is 25,000 mi at the equator. What is the circumference in kilometers? in meter? -- I really don't understand how to concer this. Please help!

    asked by Jecce on July 21, 2008
  92. astronomy 101

    Given that the angular size of Venus is 53ŒŒ'' when the planet is 47000000kmkm from Earth, calculate Venus's diameter (in kilometers).

    asked by Anonymous on August 30, 2014
  93. Algebra

    The distance from the Earth to the sun is 93,000,000 miles. Write this number in scientific notation.

    asked by MikeW on March 18, 2014

    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

    asked by NANDU on January 13, 2012
  95. physics

    How far from the center of the earth must a person be to experience acceleration due to gravity that is one half the acceleration at the surface?

    asked by Anonymous on February 19, 2012
  96. Science

    Without newtons second law would there be gravity on earth??????? Help!!! And also how are newtons second and third laws of motion important to your everyday life?

    asked by Kahoho on March 26, 2014
  97. Mechanics:Statics

    Two 10 kg spheres are placed 500mm apart. Express the gravitational attraction acting on one of the spheres as a percentage to its weight on earth.

    asked by Marc on April 19, 2013
  98. english

    The cheetah has a thin elongated body and is said to be the fastest runner on earth. in the above sentence, runner is a noun or not

    asked by ramesh reddy on March 26, 2009
  99. Marine Biology

    Surface currents are created by wind and the Earth's rotation. What creates deep water currents?

    asked by Michelle on May 22, 2012
  100. physics

    How far (in meters) above the earth's surface will the acceleration of gravity be 27.0 % of what it is on the surface? can someone please just give me an equation to figure this out please I am lost

    asked by jessica on March 13, 2012