1. Chemistry

    18. Explain how the atomic number of an element identifies the element. 19. How can atomic number and mass number be used to find the numbers of protons, electrons, and neutrons? 20. An atom is identified as platinum-195

    asked by Rosio on September 22, 2006
  2. Chemistry

    xplain why the value of the band gap energy, Eg, decreases in the following homologous series: Cdiamond=5.4 eV; Si=1.1 eV; Ge=0.72eV; Sn=0.08 eV. As we move down the group, bond strength increases. As the strength increases, materials become more metallic

    asked by Ankur on January 11, 2013
  3. physics

    The wind exerts a force of 280 N North on a sailboat, while the water exerts a force of 131 N West on the sailboat. How many degrees west of north is this net external force directed?

    asked by Anonymous on November 17, 2011
  4. physics

    As two boats approach the marina, the velocity of boat 1 relative to boat 2 is 2.20m/s in a direction 47.0 ∘ east of north. If boat 1 has a velocity that is 0.745m/s due north, what is the velocity (magnitude and direction) of boat 2?

    asked by name on September 21, 2014
  5. physics

    A simple temperature model for the solar nebula disk is Tdisk(a) = 20 × SQRT 100 AU/ a K, (1) where a should be expressed in AU in this equation. (a) Find the temperature in the solar nebula disk at the orbit of Mer- cury, Earth and Jupiter. (b)

    asked by kathy on November 13, 2014
  6. Business

    I am trying to write a 1500 words review of two articles that are discussing ethical perspectives or business ethics for two countries. Each article must contain info. on a different foreign country on a different continent; for example, if the first

    asked by kim on January 16, 2011
  7. Precalculus

    A nautical mile equals the length of arc subtended by a central angle of 1 minute on a great circle on the surface of Earth. If the radius of Earth is taken as 3960 miles, express 1 nautical mile in terms of ordinary, or statute, miles.

    asked by Jillian on January 12, 2012
  8. science

    why does the sun appear to move westward across the sky during the day? a) because earth rotates to the east b) because earth rotates to the west c) because the sun moves in a westerly direction d) because of the way you are looking into the sky

    asked by need help on January 27, 2016
  9. science

    why does the sun appear to move westward across the sky during the day? a) because earth rotates to the east b) because earth rotates to the west c) because the sun moves in a westerly direction d) because of the way you are looking into the sky

    asked by victoria on October 30, 2013
  10. Physics

    Carbon-15 has a half-life of 5730 years. As observed from Earth, what would the half-life of carbon-15 be if it traveled through space at 25% of the speed of light, relative to Earth?

    asked by Anonymous on January 19, 2018
  11. volume,mass,weight

    if you travelled to a planet that had twice the force of gravity of earth and you have taken a small mass that is 1kg what is the mass weight and volume of the 1kg object on the new planet compared to earth

    asked by dw on March 5, 2012
  12. Free Fall

    The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 3.9 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X?

    asked by Joe on October 4, 2012
  13. math

    the distance from the sun to earth is about 1.5x10^11 meters. suppose light travels at a speed of 3x10^8 meters per second. About how long does it take light from the sun to reach earth? PLEASE HELP!!!

    asked by shirly on December 26, 2014
  14. Physical science

    The diameter of the planet saturn is 10 times that of the earth but the mass of the planet is only 90 times greater than that of the earth.what isthe gravitational acceleration(or number of 'gs'you"ll feel)on saturn?

    asked by Thando on March 2, 2015
  15. AED 200

    What are the fundamental differences between Western philosophies and Native North American ways of knowing? (Generally, how does each culture view the world and education?) How can you incorporate seemingly different ways of knowing in your curriculum?

    asked by Stacey on October 21, 2009
  16. Physics

    Michael flies in an airplane due north to Michigan. The pilot encounters a direct crosswind from the west of 120 mph. What direction must the pilot steer in order to end up with a resultant of due north and average velocity of 120 mph? Measure and

    asked by Jennifer on August 28, 2016
  17. physics

    An airplane flies at airspeed (relative to the air) of 400km/h. The pilot wishes to fly due North (relative to the ground) but there is a 110km/h wind blowing Southwest (direction 225º clockwise from North). In what direction should the pilot head the

    asked by puff puff on September 17, 2006
  18. Physics

    What would be the weight of a 1.0kg mass on the surface of Mars? The mass of Mars is 0.11 that of the earth, and its radius is 0.53 that of the earth.

    asked by Universal Gravitation on December 15, 2010
  19. Physical Science

    The only force acting on a satellite in its orbit around Earth is the force of gravity from Earth. Why does a satellite not fall down?

    asked by Sarah on January 2, 2011
  20. Physics

    Which requires more fuel- a rocket going from the earth to the moon or a rocket coming from the moon to earth? Please explain why. Thank you so much :)

    asked by Rebekkah on May 14, 2011
  21. Science

    The only force acting on a satellite in its orbit around Earth is the force of gravity from Earth. Why does a satellite not fall down?

    asked by Anonymous on August 20, 2010
  22. physics

    The only force acting on a satellite in its orbit around Earth is the force of gravity from Earth. Why does a satellite not fall down?

    asked by Anonymous on August 16, 2010
  23. Science

    An object has a mass of 5.0 kg on the surface of the Moon. What would be the object's: a) mass on Earth b) force of gravity on Earth

    asked by Annie on May 28, 2014
  24. Science/Physics

    Andee has a mass of 68.5 kg on earth. What is his weight on Earth? What should his mass be in order to have the same weight at the surface of the moon?

    asked by Gwyn Kyla Agduma on July 31, 2014
  25. english

    For my assignment I have to find an advertisement, analyze it, and write my interpretation of it. I've done this, but I'm coming out short on words for the assignment. And I feel like there's nothing else that I can mention. I'm supposed to write 500 words

    asked by y912f on October 13, 2010
  26. 11th grade

    A bus travel 250km south along a straight path with the average velocity of 84km/h to the the bus stop for 26 min. Then in it travel 240km with avrage 70km/h to the south.How long long did the hold trip take? What is the average velocity of the trip?

    asked by taylor on September 20, 2010
  27. Trigonometry

    An airplane is 48 miles due north of a town. An airport is 29 miles North-West of the town. It is determined that the airplane is 34 miles from the airport. On what bearing should the pilot fly to get to the airport? Please show work if possibly, I'm

    asked by Serena on November 6, 2016
  28. Math

    1. If the cost to recover the 60 to 70 foot cypress trees is $375 each and the cost to harvest the larger trees is $500, how much it cost to recover all of the trees if 2/5 of the trees are more than 70 feet long? 4. Because the harvested lumber depletes

    asked by kml on June 24, 2014
  29. Triangles

    How will you find the distance of a star from Sun, given that the angle at which it is viewed from the two solstices of Earth(i.e winter and summer) are alpha and beta respectively, and the distance between the points of the solstices is 150 million km.

    asked by Shanu on January 22, 2015
  30. physics

    a boy runs 100m along the east,then he turns to his left side at right angle and runs for 50m along the north direction.find the distance and the magnitude of the displacement .

    asked by bamba on July 2, 2017
  31. Physics

    An air craft is traveling due north with avelocity of 100 m/s, astrong wind blows from the west with avelocity of 25m/s find resultant velocity

    asked by Wende on March 30, 2017
  32. Trig.

    Help with this problem please. I don't get it at all. A ship is heading due north at 12 mph. The current is flowing southwest at 4mph. Find the actual bearing and speed of the ship.

    asked by Shane on March 30, 2010
  33. Physics

    an earth satellite has an elliptical orbit with an eccentricity value, e=0.40 and on orbital period of 10 hours and 54.0 minutes. Find the height above the surface at its closest approach point.

    asked by Ana on May 14, 2017
  34. physics

    An object is projected upward from the surface of the earth with an initial speed of 2 km/s. The acceleration of gravity is 9.81 m/s^2. Find the maximum height it reaches. Answer in units of km.

    asked by michelle on November 30, 2012
  35. math

    A40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form aplateform of dimension 28m by 22m.find the height of the platform.

    asked by tarekegn on May 13, 2015
  36. Physics

    I have to find the Current created by earth as it circles the sun.through the formula I=(Q/delta t). Hint:It says think of the cross section of the earths orbit.How often does a charge pass through it.

    asked by Jim on March 10, 2008
  37. precal

    The Census Bureau reported that the population of the United States in 1995 was 262.9 million. Referring to the statistics on the second page of the Background Information for Project 4, how many crimes committed in 1995 occurred in the South? The

    asked by Anonymous on September 2, 2010
  38. physics

    Two bicyclists, starting at the same place, are riding toward the same campground by two different routes. One cyclist rides 1500 m due east and then turns due north and travels another 1430 m before reaching the campground. The second cyclist starts out

    asked by john on September 17, 2010
  39. chemistry

    I have a compound ch3 = ch- ch - oh ch3 the ch3 is under the first ch from the left, i have to identify the monomer unit and draw a structure showing three monomer unit any help i have a compound CH3= CH - CH - OH and another CH3 under the first CH from

    asked by bex on February 26, 2007
  40. Biology

    Pick the BEST answer: A)Which Of The Following Is An "Excitable Cell"? 1) Neuron 2) Electron 3) Hormone 4) Both 1 & 2 5) All Of The Above B)What Is The Popular Molecule That Energizes Many Activities In Cells? 1) Adenosine Triphosphate 2) Adenosine

    asked by Biomed on December 12, 2007
  41. Science/Biology

    Pick the BEST answer: A)Which Of The Following Is An "Excitable Cell"? 1) Neuron 2) Electron 3) Hormone 4) Both 1 & 2 5) All Of The Above B)What Is The Popular Molecule That Energizes Many Activities In Cells? 1) Adenosine Triphosphate 2) Adenosine

    asked by Biomed on December 11, 2007
  42. Physics

    When light of wavelength 130 nm falls on a cobalt surface, electrons having a maximum kinetic energy of 4.55 eV are emitted. Find values for the following. (a) the work function of cobalt (in eV) (b) the cutoff wavelength (in nm) (c) the frequency

    asked by Theresa on April 14, 2017
  43. Precalculus

    An airplane is flying due west at a velocity of 100 m/s. The wind is blowing south at 5 m/s. a. Draw a labeled diagram of the situation. b. Find the resulting ground speed and bearing of the airplane?

    asked by Marie on February 14, 2010
  44. Physical Science

    What is the hiker's total displacement? part a of the hike: distance:4km east start time: 9:00 am end time: 9:45 am part b: distance:6 km south start time: 9:45 am end time: 10:45 am part c: distance:4 km west start time:10:45 am end time: 11:15 part d:

    asked by dark1 on February 20, 2014
  45. Physics

    A satellite orbits the earth at a distance of 10,000 miles from the earth's center. At this distance the force of gravity on the satellite is 90lbs. What would the force on the satellite be if the distance were 5000 miles instead? At what distance from the

    asked by Anonymous on May 18, 2010
  46. college essay

    Please tell me if I answered the prompt and check it Choose apiece of literature you have read and describe how it has affected you. For many people, the image that comes to mind when they hear, the word slavery is the Transatlantic Slave Trade. We think

    asked by Danny on November 25, 2007
  47. Physics (Mechanics) - unanswered

    An electron of mass 9.1E-31 kg is released from rest at a distance of 7.1 E-10 m from a fixed electron. The force on the movable electron is given by the function F = 2.3E-28/r^2, where r is the distance between the electrons. Find the maximum velocity (in

    asked by andrew on April 13, 2012
  48. Travel and tourism/geography

    I need to write a report on the garden route, in South Africa but I can't find the information I need. What is the garden route? Which towns form part of the garden route? Where can I find all the information I need?

    asked by Zara on August 1, 2009
  49. Geological Events

    In 2005 and 2006, several major earthquakes occured in Pakistan and Iran, located to the north and west of India. A) Why does the theory of plate tectonics support the occurence of earthquakes in these countries? The plate tectonics theory states that the

    asked by Anonymous on January 12, 2011
  50. physics

    Two racing boats set out from the same dock and speed away at the same constant speed of 94.0 km/h for half an hour (0.500 h), the blue boat headed 26.0° south of west, and the green boat headed 38.2° south of west. During this half-hour (a) how much

    asked by ... on January 25, 2013
  51. Science..physics

    The moon is the Earth's nearest neighbour in space. The radius of the moon is approximately one quarter of the Earth's radius, and its mass is one eightieth of the Earth's mass. a) Culculate the weight of a man with a mass of 80kg on the surface of the

    asked by Melyn on April 24, 2013
  52. science

    The moon is the earth's nearest neighbor in space the radius of the moon is approximately one quarter of the earth's radius and it's mass is one eightieth of the earth's mass.(a)calculate the weight of an object with a mass of 50.0kg on the surface of the

    asked by lebo on February 21, 2013
  53. Static Electricity. 11th Grade Pre-AP Physics

    Hi everyone! I need some help studying for a test on Static Electricity. I have a few review questions that I don't know how to do. Below they are numbered and in parenthesis I answered what I think you might have to do to get the answer. Please help me in

    asked by Angela on February 25, 2011
  54. Physics D

    A 1500-kg car moving north at 27.0 m/s is struck by a 2165-kg car moving east at 13.0 m/s. The cars are stuck together. How fast and in what direction do they move immediately after the collision? 1. what is the degree north of east? 2. how was do they

    asked by Adam on February 4, 2014
  55. Physics

    A plane has a loaded mass of 115,000 kg. It's shown travelling north at a speed of 825 km/h and banking at an angle of θ = 18° in level flight. Find the magnitude of the vertical component of the lift vector.

    asked by Yael on April 16, 2018
  56. Physics

    Vector V1 is 6N along the negative axis. Vector V2 is 4.5 N and point 45 degrees north of the x axis. Find the x and y components of each vector and find the resultant R=V1+V2with the components.

    asked by Maddie on November 27, 2013
  57. Earth space science

    I need help with this. the map doesnt show anything and idk how to post the map on here... Match the cities A,B,C, and D with the weather description of the surface model (To the right of each letter) a. city A b. City B c. City C d. City D A. Pressure of

    asked by Selena on November 14, 2013
  58. Physics

    I have a hard time solving this problem. The weight of an object at the surface of a planet is proportional to the planet's mass and inversely proportional to the square of the radius of the planet. Jupiter's radius is 11 times Earth's and its mass is 320

    asked by Nisar on August 28, 2005
  59. physic

    Lai was driving north on Hwy 75 with a speed of 56.9 m/s when she heard on a CB that a patrolman was hiding 127.3 m north of where she is. Knowing that the patrolman can start clocking the car in 2.7 seconds, Lai decided to slow to 34.2 m/s. and

    asked by Shannon on August 24, 2011
  60. science !!!!

    does anybody know some quick facts about earth science (Broken Link Removed)

    asked by yasmin on July 22, 2006
  61. Physics

    Multiple-Concept Example 3 provides some pertinent background for this problem. Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is

    asked by Sarah on February 12, 2009
  62. physics.

    Multiple-Concept Example 3 provides some pertinent background for this problem. Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is

    asked by Jordan on February 12, 2009
  63. E.L.A. PLEASE CHECK!

    Which choice does not contain a run-on sentence? A- Using the Big Dipper, you can find the North Star just follow an imaginary line through the Dipper’s two end stars. B- Using the Big Dipper, you can find the North Star. Just follow an imaginary line

    asked by Skye on October 1, 2014
  64. main ideas study unit

    scientist generally agree that earth is getting warmer due to what call the green house effectt. a greenhouse used for plant stay warm because sunlightand heat come through the glass roof are mostly trapped by the grass something like that happen on earth.

    asked by nicole on January 12, 2011
  65. Social Studies

    Because General Thomas J.Jackson stood his ground at the First Battle of Bull Run,his troops nicknamed him what? Thomas "Stonewall" Jackson? The Civil War began when the south fired on Fort Sumter.What city/state is Fort Sumter in? Charleston,South

    asked by Neon on April 24, 2012
  66. History

    how did the end of World war 1 affect farmers in south carolina? A.the price of crops fell,so farmers no longer enjoyed the prosperity they knew during the war B.most rural farmers gained electricity and running water. C.the boll weevil appeared in

    asked by Help me,plz on March 30, 2015
  67. More Physics

    The diagram below indicates three positions to which a woman travels. She starts at position A, travels 3.0 km to the west to point B, then 6.0 km to the north to point C. She then backtracks, and travels 2.0 km to the south to point D. a) What is the

    asked by Ellie on October 29, 2006
  68. physics

    thus far in the course we have ignored that on the earths surface an object must have a slightly unbalanced force to rotate with the earth, pretending that the normal force precisely balances the objects weight. A student with a mass of 65.0kg stands at

    asked by marie on May 15, 2013
  69. science

    movement of earth around sun and movement of moon around earth

    asked by ali on May 18, 2008
  70. Physics

    A rock (m = 1.5 kg) moving at 4.2 m/s north collides with a ball (m = 0.061 kg) that is initially at rest. What is the velocity of the rock after the collision if the velocity of the ball after the collision was 8.4 m/s north?

    asked by Zach on January 16, 2012
  71. Algembra

    a train leaves a station and travels north at 85 km/hr. Four hours later, a second train leaves on a parrallel track and travels north at 125km/hr. How far from the station will they meet?

    asked by Ann on July 14, 2011
  72. physics

    a truck is moving 15m/s North. after 7.9 has elapsed it is moving 55m/s North. determine the truck's acceleration and determine its displacement during the elapsed time.

    asked by Anonymous on December 13, 2011
  73. math

    joe walked 4 miles north, 9 miles east then 8 miles north and 7 miles east if Al decides to walk straight back to where he started how far must he walk?

    asked by blake on November 12, 2012
  74. physics

    A plane passes over point A with a velocity of 8000 m/s north. Forty seconds later it passes over point B at a velocity of 10000m/s north. What is the plane's acceleration from A to B?

    asked by ....... on October 28, 2011
  75. physics

    Two automobiles of equal mass approach an intersection. One vehicle is traveling with velocity 15.5 m/s toward the east and the other is traveling north with speed v2i. Neither driver sees the other. The vehicles collide in the intersection and stick

    asked by Anonymous on March 1, 2011
  76. PhysicsIn what direction relative to north must ca

    Two canoeists start paddling at the same time and head toward a small island in a lake, as shown in the figure . Canoeist 1 paddles with a speed of 1.60 at an angle of 45 north of east. Canoeist 2 starts on the opposite shore of the lake, a distance of 1.5

    asked by Alyssa on February 9, 2012
  77. Physics

    A Car moving North at 9 m/s strikes a stationary car of equal mass. The first car moves off after the collision at an angle of 30 degrees West of North, with a speed of 6 m/s. What is the speed of the second car after the collision? My resources have poor

    asked by BB on September 18, 2014
  78. History

    In what region of the US were most of the nation's cities located in the 1850s? North** South East West  Which of the following is a reason Southern states seceded from the Union? They wanted to support the Union. They wanted to abolish slavery. They

    asked by Anonymous on March 23, 2018
  79. physic

    Can somebody shows me how to calculate for part c. the answer key is 1.365h. A jetliner travels with a constant speed of 573.7 km/h relative to the air to a city 780.1 km due south. (a) What is the time interval required to complete the trip if the

    asked by joy on February 5, 2018
  80. science

    Will we ever run out of air? Air is stuck to the planet by gravity, it won't leave. Two things are adding to the air all the time too, the planet is always releasing gasses from volcanoes and volcanic vents, and there are some meteors that are mostly ice

    asked by Eva on December 9, 2006
  81. Math Ms. Sue please help!!!

    Okay I am really stuck on this question Tip: ^ = exponent Example: 6x10^7 7 is exponent Question: Venus is the second planet from the sun. Earth is the third planet from the sun. The distance from Venus to the sun is 6.72x10^7 and the distance from Earth

    asked by Angelina on November 7, 2013
  82. maths

    An aircraft travels at 250km/h in still air. If a wind of 50km/h blows steadily from the southwest and the pilot wishes to fly due north, find the course he must set and the ground speed of the aircraft. On the return journey the wind speed and direction

    asked by Alhassan A. fuseini on June 22, 2017
  83. Physics

    A photon of energy E strikes an electron at rest undergoes pair production, producing a positive electron(positron) and an electron, photon+electron produce positron+electron+electron The two electrons and the positron move off with identical momenta in

    asked by Abby on March 22, 2011
  84. phisycal sciences

    Which of the following properties did Rutherford use in his experiment? A. the negative charge of the alpha particles and the random distribution of protons B. the negative charge of the alpha particles and the positive charge of the gold foil C. the

    asked by david on May 3, 2012
  85. Life Orientation

    Hi I am a matric learner and I am having trouble with an lo portfolio assignment. it is about environmental issues and im stuck. I need to identify and describe 3 environmental health hazards that cause ill health, accidents, crisis and disasters within my

    asked by Ashley on May 1, 2013
  86. Chemistry (Follow up post - Dr.BOB22)

    Ionization is when an electron is removed from an atom and ionization energy is the energy required to do this. "Electrons stream from the negative electrode to the positive electrode. In the process of moving from one electrode to the other they knock

    asked by Jessica on November 14, 2011
  87. Geography

    24. The South African government changed its policy of apartheid in 1990 and 1991 because of a. the policy's failure to eliminate racial discrimination b. promises of economic aid from major industrial nations c. international sanctions and an increase in

    asked by mysterychicken on October 28, 2009
  88. Physics

    A body of mass 20kg is transferred from earth (grams=weight newton kg) to another planet where G=2 Newton kg, 1.Wat is the mass on earth? 2.wat is the wieght on earth? 3.wat is the mass on the other planet? 4.wat is the weight on the other planet?

    asked by Jan on September 16, 2007
  89. math

    A body of mass 20kg is transferred from earth (grams=weight newton kg) to another planet where G=2 Newton kg, 1.Wat is the mass on earth? 2.wat is the wieght on earth? 3.wat is the mass on the other planet? 4.wat is the weight on the other planet?

    asked by Jan on September 16, 2007
  90. Physics (help plz)

    A body of mass 20kg is transferred from earth (grams=weight newton kg) to another planet where G=2 Newton kg, 1.Wat is the mass on earth? 2.wat is the wieght on earth? 3.wat is the mass on the other planet? 4.wat is the weight on the other planet?

    asked by Jan on September 16, 2007
  91. Physics

    A body of mass 20kg is transferred from earth (grams=weight newton kg) to another planet where G=2 Newton kg, 1.Wat is the mass on earth? 2.wat is the wieght on earth? 3.wat is the mass on the other planet? 4.wat is the weight on the other planet?

    asked by Jan on September 16, 2007
  92. Physics (help plz)

    A body of mass 20kg is transferred from earth (grams=weight newton kg) to another planet where G=2 Newton kg, 1.Wat is the mass on earth? 2.wat is the wieght on earth? 3.wat is the mass on the other planet? 4.wat is the weight on the other planet?

    asked by Jan on September 16, 2007
  93. Physics

    The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of

    asked by Kristyn on March 29, 2015
  94. physical science

    the diameter of the planet saturn is 10 times that of the earth but the mass of the planet is only 90 times greater than that of the earth.what is the gravitational acceleration or number gs you will feel on saturn?(8.8m.s-2)

    asked by celiwe on February 16, 2014
  95. Math

    A year on Mars is 1.88 Earth years. If you are 13 years old on Earth, how old would you be on Mars? I don't know if I am supposed to multiply or divide. I also don't understand what the question is trying to state. Thanks

    asked by Anonymous on October 25, 2016
  96. math

    2.If a sledgehammer that weighs 18 newtons on Earth will weigh about 4 newtons on the planet Namar, then your weight on Namar would be about ___ times your weight on Earth. A. 0.25 B. 4 C. 0.5 D. Not enough information

    asked by Julia on May 15, 2015
  97. maths

    If the speed of light is 3x10^8m/s and the distance around the earth is 4.5x10^4 km and a plane could travel at half a speed of light, how long would it take for the plane to fly around the earth twice?

    asked by Anonymous on January 6, 2016
  98. physics

    How do I calculate the radial acceleration in g's? For example: Calculate the radial acceleration (in g’s) of an object on the ground at the earth's equator, turning with the planet. Earth's radius is 6380 km.

    asked by D on February 4, 2014
  99. chemistry

    Radio waves travel at the speed of light which is 3.00 x 108 m/s. How many minutes does it take for a radio message to reach Earth from Saturn if Saturn is 7.9 x 108 km from Earth?

    asked by ashley on September 12, 2010
  100. Physics

    A 5.00 x 102 kg hot air balloon takes off from rest at the surface of the earth. The buoyant force lifts the balloon straight up, performing 9.70 x 104 J of work on the balloon. At the instant the balloon's upward speed is 4.08 m/s, the balloon will be

    asked by Help on November 18, 2014