1. physics

    in 2005, the space probe Deep Impact launched a 30 kg projectile into Comet Tempel 1. Observing the collision helped scientists learn about the comet’s characteristics. The come is estimated to have a mass of 9.0 x 1013 kg. a. Assuming the estimated mass
  2. physics

    Suppose that the attraction between the moon and the earth were due to Coulomb forces rather than gravitational force. What would be the magnitude of the charge required if equal but opposite charges resided on both earth and moon? Mass of earth =
  3. physics

    A planet orbits a star once every 3.14x10^7 s in a nearly circular orbit of radius 1.51x10^11 m. (a) With respect to the star, determine the angular speed of the planet b) With respect to the star, determine the tangential speed of the planet. c) With
  4. Science 6th grade Earth's day and night ANSWERS

    1. how does earth's rotation cause day and night? (1pt) As the earth rotates toward the east the sun appears to rise in the east and set in the west. 2.Roughly how many times does the earth rotate during each complete revolution? (1pt) 365. 3. Saturn's day
  5. Pre-Calculus

    Venus orbits the sun in an approximately circular path. Venus is about 67 million miles from the sun. A comet is located 80 million miles north and 73 million miles west of the sun. The comet follows a straight-line path and exits Venus's orbit at the east
  6. English

    Can you please tell me if the following alternatives are all possible? I hope you can have a look at them. 1)The jewish communities were restricted in their (or the) professions they could follow. 2)As Christians were not allowed to lend money at interest,
  7. English

    1. What makes our earth sick? Gases from cars make the earth sick. Paper cups make the earth sick. _________ make(s) the earth sick. _________ make(s) the earth sick. (Would you name what makes the earth sick? The more,the better. The things suitable for
  8. Science

    Please check my answers? My textbook won't load, so i've had to use google and guess. 1. Scientists hypothesize that the sun formed ____. (1 point) less than a billion years ago **from a cloud of gas and dust less than a million years ago from a chunk of
  9. Physics

    1. Does the center of gravity coincide with the fulcrum? Why? 2. why does a meter stick balance if the moments in one side equals the moment on the right side? 3. When do you solve for percent difference? Percent error?
  10. Physics

    A perforated bead of mass 37g moves on a frictionless horizontal circular track of radius R=0.65m. The track runs through the bead. When the bead is at rest in the horizontal position, it is tied to a spring at the centre of the track. The unstretched
  11. maths

    The distribution of the time taken to run 1000 metres by users of a treadmill in a sports centre has mean 7.2 minutes and standard deviation 2.045 minutes. 1 Choose the option that is closest to the probability that the mean time taken to run 1000 metres
  12. maths

    The distribution of the time taken to run 1000 metres by users of a treadmill in a sports centre has mean 7.2 minutes and standard deviation 2.045 minutes. 1 Choose the option that is closest to the probability that the mean time taken to run 1000 metres
  13. calculus

    The distribution of the time taken to run 1000 metres by users of a treadmill in a sports centre has mean 7.2 minutes and standard deviation 2.045 minutes. 1 Choose the option that is closest to the probability that the mean time taken to run 1000 metres
  14. earth

    When earth is seen from outer space,it looks mainly blue. This is because most of the earth is covered with.
  15. trig

    earth is 149 600 000 km from the sun. this distance is equal to 1 A.U (astronomical unit). Mars is seen form earth to make an angle of 68degrees with the sun. a) draw a diagram and label b)how far are earth and mars c) do you think the distance between
  16. physics

    The earth has a radius of 6380 km and turns around once on its axis in 24 h. 1)What is the radial acceleration of an object at the earth's equator? Give your answer in m/s^2 2) What is the radial acceleration of an object at the earth's equator? Give your
  17. Physics

    The Moon orbits the Earth at a distance of 3.85 x 108 m. Assume that this distance is between the centers of the Earth and the Moon and that the mass of the Earth is 5.98 x 1024 kg. Find the period for the Moon's motion around the Earth. Express the answer
  18. AP Biology

    How many joules of sunlight hit Earth per day? I have looked everywhere and can't find an answer!! The sun emits about 4*10^26 Watt. The flux of solar energy at the Earth is thus about: F = 4*10^26 Watt/(4 pi R^2) where R = 149.6*10^9 meters is the
  19. (pls help) physics

    (Q1) A 50kg boy suspends himself from a point on a rope tied horizontally between 2 vertical poles. the 2 secments of the rope are then inclined at angles 30degrees and 60degrees respectively to the horizontal. The tension in the sefments of the rope is
  20. Phyics Toughest question on earth

    Estimate the time difference between the longest day and the shortest day of a year in seconds if you lived on the Earth's equator with the assumptions below. Note: this is not the difference between solstices as we are adjusting the earth's rotation axis
  21. science

    A spaceship of mass 2000kg is moving towards planet Earth. Calculate the magnitude of the force that the earth exerts on the spaceship when the spaceship is 100km above the surface of the Earth. The Earth has a mass of 6*10 to the power of 24 kg and a
  22. Chemistry

    The mass of the earth is known to be about 5.98 X10^24kg assume that it is approx. spherical with an average diameter of 1.276X10^7 METERS. from these data calculate the average density of the earth(g/cm^3) could the earth be made mostly of water
  23. physics

    A planet with a mass of (7*10^21) kg is in a circular orbit around a star with a mass of (2*10^30) kg. The planet has an orbital radius of (3*10^10) m. (a) What is the linear orbital velocity of the planet? (b) What is the period of the planet's orbit? (c)
  24. Physics

    Let us assume that the muon production happens at an altitude of about 15 kilometers above the surface of the Earth, and that the produced muons have a velocity of 0.99 c. Thus, in the Earth system, it takes the muon approx. 50500 nanoseconds to reach the
  25. Physics

    The earth has about 80 times the mass of the earth’s moon. The gravitational force exerted on the moon by the earth has what relation to the gravitational force exerted on the earth by the moon? 1. the same as 2. zero; the earth exerts a force on the
  26. Physics

    Find the magnitude of the gravitational attraction force that the earth exerts on a 62-kilogram astronaut who is 8.00 X 10^7 meters away from the center of the earth. Useful numbers: M^earth=5.98 X 10^24kg; G=6.67 X 10^-11 N*m^2kg^-2 Please walk me through
  27. Math

    A rectangular sheet of paper 8.5 inches by 11 inches is folded and then taped so that one pair of opposite vertices coincide. What is the number of inches in the perimeter of the resulting pentagon? Express your answer as a decimal to the nearest tenth.
  28. Physics

    Suppose there's a collison way out in the Oort cloud, say 30,000 AU away from the Sun. This collison causes one of the comets to alter its orbit and head almost directly at the Sun, such that the comet just skims the surface of the Sun and heads back out
  29. Earth Science

    1. The water cycle is the _____. A. distribution of drinking water on Earth ?**? B. unending circulation of Earth's water supply ?**? C. the recycling of water after industrial use ?**? D. the evaporation of water from Earth's surface ?**? 2. Plants
  30. physic

    During fair weather, an electric field of about 100 N/C points vertically downward into the earth's atmosphere. Assuming that this field arises from charge distributed in a spherically symmetric manner over the surface of the earth, determine the net
  31. physics

    Calculate the magnitudes of the gravitational forces exerted on the Moon by the Sun and by the Earth when the two forces are in direct competition, that is, when the Sun, Moon, and Earth are aligned with the Moon between the Sun and the Earth. (This
  32. English

    Here is the second part of my summary. Can you please check if everything is OK now? By the way, do you say "On which carriage or in which carriage is your seat?" Which bus number goes to the city centre OR Which number bus goes ....? 1) Go into the
  33. Physics

    A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity
  34. Physics

    A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity
  35. Physics

    Take into account the Earth's rotational speed (1 rev/day) and use 5 significant figures. (a) Determine the necessary speed, with respect to Earth, for a rocket to escape if fired from the Earth at the equator in a direction eastward. (The escape velocity
  36. English

    I forgot to include the following statements: Thank you very much in advance. 1) Yesterday I read the following news in the newspaper. 2) On Sunday morning a young man, who was drunk (?) and had spent his Saturday night in a disco, drove his car at top
  37. English

    I included the last sentences on cheetahs and a few more on the use of gerund/infinitive. Thank you. 1) This project aims at establishing a second, independent population of Asiatic lions and will hopefully enable the subspecies to survive, too. 2) This
  38. physics

    A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The diameter of the steel wire is 0.60mm and the length of the bar AB is 0.20m. When a mass of 10.0kg is suspended from the centre
  39. physics

    A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The diameter of the steel wire is 0.60mm and the length of the bar AB is 0.20m. When a mass of 10.0kg is suspended from the centre
  40. Physics

    A bag of sugar weighs 4.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? 1 N Repeat for Jupiter, where g is 2.64 times that on Earth. 2 N Find the mass of the bag of sugar in kilograms
  41. physics

    A bag of sugar weighs 3.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? N Repeat for Jupiter, where g is 2.64 times that on Earth. N Find the mass of the bag of sugar in kilograms at
  42. Physics

    The Earth is surrounded by an electric field on its surface that points toward the center of the Earth with an average magnitude of 150 N/C. If there is an electron that is released in vacuum at the Earth’s surface, what will the acceleration due to the
  43. physics

    A bag of sugar weighs 3.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? N Repeat for Jupiter, where g is 2.64 times that on Earth. N Find the mass of the bag of sugar in kilograms at
  44. physics

    calculate the force of Earth's gravity on a spacecraft 12,800 km (2 Earth radii) above Earth's surface if its mass is 1350 kg. i know the universal gravitation formula is Fg = G [(m1 m2)/ r^2] but im not getting anywhere near the multiply choice answers
  45. physics

    The Earth rotates on its own axis once per day (24.0h). What is the tangential speed of the summit of Mt. Kilimanjaro (elevation 5895 m above sea level), which is located approximately on the equator, due to rotation of the Earth? The equatorial radius of
  46. physics

    A bag of sugar weighs 3.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? N Repeat for Jupiter, where g is 2.64 times that on Earth. N Find the mass of the bag of sugar in kilograms at
  47. 4th grade math

    it takes jupiter 12 years to orbit the sun. how many days does it take jupiter to orbit the sun?. add 3 days for leap years
  48. Science

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

    1.Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? -a solar eclipse -a lunar eclipse -a total lunar eclipse -a penumbra 2.Which of the following statements about a lunar eclipse is true? -A lunar eclipse
  50. English

    Can you please help me rephrase a sentence taken from Virginia Woolf's Mrs.Dalloway? "And there the motor car stood, with drawn blinds, and upon them a curious pattern like a tree, Septimus thought, and this gradual drawing together of everything to one
  51. Art

    I left out the following sentences.I really hope you can cehck them. Thank you very much, Writeacher. 1) On the second day we spent time in the city centre shopping for souvenirsfor our relatives. 2) The price for our hotel accommodation amounted to 300
  52. physics

    given that the radius of the earth is 6.37×10^3km and the period of revolution of the moon round the earth is 27.3 days, calculate the average distance from the earth to the moon.
  53. earth

    Body on surface of earth weighs 400 lb. Radius of earth is about 4000miles. If same body were placed on 4000 mile high tower, what would its weight be
  54. science

    an imaginary dense star Z has 1/5 the radius of earth, but 1000 times earth's mass. How much would a masss weighing 1.0 N on earth weigh on Star z
  55. PHYSICS

    Search: a 1.0 kg mass weighs 9.8 n on earths surface and the radius of the earth is roughly 6.4x10 to the 6 m. what is the mass of the earth and the average density of Earth
  56. physics

    Suppose a person weighs 160 pounds on Earth. How much would that person weigh on a planet that was three times as massive as Earth and had a radius that was twice that of Earth's?
  57. earth

    A distant galaxy is simultaneously rotating and receding from the earth. As the drawing shows, the galactic center is receding from the earth at a relative speed of uG = 1.7 x 106 m/s
  58. Physics

    Use 5.98 × 10 24 kg as the mass of the Earth. A 2350 kg meteorite has a speed of 143 m/s just before colliding head-on with the Earth. Determine the recoil speed of the Earth. Answer in units of m/s
  59. ALGEBRA

    A satalites escape velocity is 6.5 mi/sec, the radius of the earth is 3960 miles and the earth's gravitational constant(g) is 32.2 ft/sec^2 How far is the satelite from the surface of the earth?
  60. physics

    i cant solve this problem i need for help please through how many does a point on the earth's surface move in 6h as a result of the earth's rotation ? what is the speed of a point on the equator ? take the radian of the earth to be 6370 km thank you
  61. physics

    i cant solve this problem i need for help please through how many does a point on the earth's surface move in 6h as a result of the earth's rotation ? what is the speed of a point on the equator ? take the radian of the earth to be 6370 km thank you
  62. Physics

    Earth has a mass of 5.97x10^24kg and a radius of 6.38x10^6m. Find the wight of a 65.0kg person on the surface of the earth and 1000km above the surface of earth?
  63. Physics

    A student with mass 55 kg jumps off a high diving board. Using 6.0×10^24 kg for the mass of the earth, what is the acceleration of the earth toward her as she accelerates toward the earth with an acceleration of 9.8 m/s2 ? Assume that the net force on the
  64. Physics

    Suppose a planet is discovered orbiting a distant star with 13 times the mass of the Earth and 1/13 its radius. How does the escape speed on this planet compare with that of the Earth? Ve new ------- = ve earth
  65. physics

    suppose that all the people of the earth went to the north pole and on a signal all jump straight up. estimate the recoil speed of the earth. the mass of the earth is 6 x 10^24 kg and there are about 6 billion people(6 x 10^9).
  66. science

    The main cause of the changing location of the tides on earth is -rotation of the Earth on its' own axis - magnetic forces of the Moon - the revolution of the Moon around the Earth *** -the position of the Sun
  67. college, Astronomy

    Compared with the strength of Earth's gravity at its surface, how much weaker is gravity at a distance of 13 Earth radii from Earth's center?
  68. physics

    person weighs 526 N on Earth. Another planet has twice the mass of Earth and Twice the radius of Earth. Find the weight on the other planet. I need help with a formula too.
  69. physics

    A space traveler weighs 620 N on earth. What will the traveler weigh on another planet whose radius is three times that of earth and whose mass is twice that of earth?
  70. Physics

    The gravitational acceleration on the surface of Mercury is 0.38 times that of Earth. Its radius is also about 0.38 times that of the Earth. What is the ratio of the density of Mars to that of Earth?
  71. physics

    A space traveler weighs 635 N on earth. What will the traveler weigh on another planet whose radius is three times that of earth and whose mass is twice that of earth?
  72. Astronomy

    Jupiter is farther from the sun than is the Earth. In the course of several earth years what phases would you expect jupiter to exhibit to an observer on earth. explain
  73. French #2 Again

    Last Saturday different people did different things. Explain what each one did by completing the sentences with the appropriate "passé composé" forms of the verbs in the list. Be logical. acheter assister ranger laver nettoyer rencontrer travailler
  74. Physics

    Whenever two Apollo astronauts were on the surface of the Moon, a third astronaut orbited the Moon. Assume the orbit to be circular and 400 km above the surface of the Moon. At this altitude, the free-fall acceleration is 1.11 m/s2. The radius of the Moon
  75. Physics

    From your intergalactic survey base, you observe a moon in a circular orbit about a faraway planet. You know the distance to the planet/moon system, and you determine the maximum angle of separation between the two and the period of the moon's orbit.
  76. physics

    Whenever two Apollo astronauts were on the surface of the Moon, a third astronaut orbited the Moon. Assume the orbit to be circular and 720 km above the surface of the Moon, where the acceleration due to gravity is 0.839 m/s2. The radius of the Moon is
  77. physics

    Whenever two Apollo astronauts were on the surface of the Moon, a third astronaut orbited the Moon. Assume the orbit to be circular and 720 km above the surface of the Moon, where the acceleration due to gravity is 0.839 m/s2. The radius of the Moon is
  78. physics

    A space probe is to be put into a circular orbit of radius 42.00 km about an asteroid. At this radius the magnitude of the gravitational acceleration, normally referred to as the "gravitational field", is 1.00×10-3 meters per second squared. What speed,
  79. Astronomy

    Consider the same asteroid initially in the asteroid belt at a distance 3 AU from the Sun, and 2 AU from Earth, which collides with Earth. As it falls towards Earth, it acquires kinetic energy (neglect its initial motion) both by being accelerated towards
  80. physics

    Assuming that 68.1% of the Earth's surface is covered with water at average depth of 1.21 mi. ,estimate the mass of the water on Earth. One mile is 1.609 km and the radius of the earth is 6.37 x 10^6 m. Answer in units of kg
  81. Physics

    Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 66 kg student to accelerate downward at 9.8 m/s2, determine the upward accelera- tion of the Earth during the student’s fall.
  82. Physics

    "If a small planet were located 8 times as far as the Earth's distance from the Sun, what would be its period in Earth years?" (22.5 earth years) As a note, we are given a table with all of the planets' masses and radii.
  83. Earth science

    How long an exposure would a photographer need to photograph star trails that are complete circles? Why? The star Sirius is 4.3 light years from Earth. Determine the distance to Sirius in km and in astronomical units. THe moon's average distance from Earth
  84. astronomy

    Your "weight" on Earth is a measure of the gravitational force between you and the Earth. What would your "weight" be on Mars? Mars has half the radius of Earth, and one-tenth the mass of Earth. Therefore your weight on Mars would be
  85. science

    How much below the surface of the earth does the acceleration due to gravity become 1percent of its value at the earth surface? The earth is assume to be a sphere of radius 6.4×10^6m.
  86. Physics

    Using the fact that a 1.0 kg mass weighs 9.8N on the surface of the earth and the radius of the earth is roughly 6.4x10^8m. calculate the mass of the earth.
  87. Astronomy

    Compared with the strength of Earth's gravity at its surface, how much weaker is gravity at a distance of 13 Earth radii from Earth's center?
  88. physical

    A mass of 1kg on the earth is attracted with a force of 9,8 N.The raduis ofthe earth is 6,38 X 10m,calculate the mass of the earth.
  89. physics

    The volume of the Earth's oceans is approximately 1.4×1018 m3. The Earth's radius is 6.4×106 m. What percentage of the Earth, by volume, is ocean?
  90. physics

    The figure below is a scaled representation of a planet's orbit with a semimajor axis of 1.528 AU. (Use the exact values you enter in previous answer(s) to make later calculation(s).) (a) Find the ratio of the aphelion-to-perihelion distance. rA rP = (b)
  91. Earth's Heat Resources

    list 3 examples of natural activities or events that carry thermal energy from within Earth directly to Earth's surface. I don't get what kinds of activities its referring to.
  92. University Physics (Cal-Based)

    Calculate the velocity of a 20kg object that is dropped from a height h above the Earth, where h is very large compared to the radius of the Earth. The radius of the Earth is 6380 m and the mass is 5.94 x 10^24 kg.
  93. Earth's Heat Resources

    list 3 examples of natural activities or events that carry thermal energy from within Earth directly to Earth's surface. I don't get what kinds of activities its referring to.
  94. physics

    Joe has a weight of 850 N (about 193 lb) when he is standing on the surface of the Earth. What would his weight (the gravitational force due to the Earth) be if he tripled his distance from the center of the Earth by flying in a spacecraft?
  95. physics

    Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 74 kg student to accelerate downward at 9.8 m/s2, determine the upward acceleration of the Earth during the student’s fall. Answer in units of m/s2
  96. English

    Can you help me rephrase first part of the song "Parents just don't understand",please? Thank you very, very much in advance 1) Parents just don't understand that children are going to make mistakes. 2) The song says that once a mother took his child (the
  97. Physics

    Find the gravitational force acting on the Sun by the Earth. Given: Mass of the Sun = 1.99 * 1030 kg Mass of the Earth = 5.98 * 1024 kg Radius of the Sun = 6.96 * 108 m Radius of the Earth = 6.37 * 106 m Distance between the Sun and the Earth = 1.50 * 1011
  98. physics

    IF a particular galaxys has a total mass of 10 to the 56 grams and the average star in that galaxy has a mass of 10 to the 35 grams, approximately how many stars are there in that galaxy? Give your answer to the nearest whole power of 10 by entering the
  99. Economics

    The Andrews Corporation produced satellite dishes, was purchased by another compay, which was a cable company: The Total Cost function for the New Company is: TC = 1,000 + 16Q – 16Q2, where the demand curve for Satellite Dishes is PS = 400 – QS and
  100. physics

    The Near Earth Asteroid Rendezvous (NEAR), after traveling 2.1 billion km, is meant to orbit the asteroid Eros at a height of about 15 km from the asteroid's center. Eros is roughly box-shaped, with dimensions 40 km 6 km 6 km. Assume Eros has a density