1. physics

    At a certain location, the solar power per unit area reaching the Earth's surface is 180 W/m2 averaged over a 24-hour day. Suppose you live in a solar powered house whose average power requirement is 3.2 kW. At what rate must solar energy reach your solar
  2. physics help

    At a certain location, the solar power per unit area reaching the Earth's surface is 180 W/m2 averaged over a 24-hour day. Suppose you live in a solar powered house whose average power requirement is 3.2 kW. At what rate must solar energy reach your solar
  3. Science

    What process involves the comparison of rock layers with others in a sequence to determine its age? radioactive decay radiometric dating relative dating absolute dating To determine the most accurate and precise age of Earth's oldest rocks, geologists
  4. History

    Which accurately describes Galileo's impact on science during the Scientific Revolution? galileo used a telescope to discover moons revolving around Jupiter and craters on earth moon galileo invented the compound microscope which improves magnification
  5. physics

    You're heading an international effort to save Earth from an asteroid heading toward us at 11km/s . Your team mounts a rocket on the asteroid and fires it for 10 min, after which the asteroid is moving at 21km/s at 32∘ to its original path. In a news
  6. physics

    The acceleration due to the moon's gravity at its surface is less than what it is here on the surface of the earth. The computed value of 1.6 m/s2 is consistent with what the Apollo Program astronauts observed during their explorations there. Imagine an
  7. earth science

    #25 seismic waves are similar to sound waves because_______ a/ both are produced by vibrations b/ both are caused by humans c/ they are both produced by radiation d/ seismic waves and sound waves are not similar in any way
  8. PHYSICS

    To monitor the breathing of a hospital patient, a thin belt is girded around the patient's chest. The belt is a 200-turn coil. When the patient inhales, the area encircled by the coil increases by 45.0 cm2. The magnitude of the Earth's magnetic field is
  9. Analytical Mechanics

    a gun is fired with muzzle velocity v0 = 1000 m/s straight up along the z-axis. While moving through the air the Earth's gravity pulls on the bullet, which has mass m = 20 grams and the bullet's air resistance force can be approximated by the relationship
  10. physics

    Challenger Deep in the Marianas Trench of the Pacific Ocean is the deepest known spot in the Earth's oceans, at 10.922 km below sea level. Taking density of seawater at atmospheric pressure (p0 = 101.3 kPa) to be 1024 kg/m3 and its bulk modulus to be B(p)
  11. geography

    Will you check my answers for me? 1. How many states are part of the contiguous United States? 48 states 2. Is the Tropic of Cancer north or south of the equator? North of the Equator 3. What are the names of the Earth's continents? North America, South
  12. english

    I have a feeling that my sentences are very bad. can you please correct them. the three senetnces are based on the poem "crossing thebar" by alfred tennyson. 1) The reason why the ship comes out from the boundless deep is because the ship symbolically
  13. PHYSICS

    A 5450-m^3 blimp circles Fenway Park duing the World Series, suspended in the earth's 1.21-kg/m^3 atmosphere. The density of the helium in the blimp is 0.178 kg/m^3. A) What is the buoyant force that suspends the blimp in the air? B) How does this buotant
  14. Science

    Which evidence from the sea floor shows that tectonic plates move? a) the sea floor is youngest near a mid-ocean ridge and older farther away b) The sea floor is much older than the continents c) mid-ocean ridges form the longest range of mountains on
  15. Science/Math/HElP

    Science- A 25N object is 3 meters up. How much potential energy does it have? our teacher said that the formula for finding out potential energy is PE = Mass * Gravity * Height. The gravity on Earth is always 9.8, but my problem is that instead of mass the
  16. Physics 3

    A 2.3-keV proton is moving horizontally and passes perpendicular to the Earth’s magnetic field at a location where the field magnitude is 52.0 T. i) Determine the magnetic force on the proton? ii) Find the ratio of this force to the gravitation
  17. Physics 3

    A 2.3-keV proton is moving horizontally and passes perpendicular to the Earth’s magnetic field at a location where the field magnitude is 52.0 T. i) Determine the magnetic force on the proton? ii) Find the ratio of this force to the gravitation
  18. science245

    Scientists debate about the use of fossils as a tool to determine records of various events, such as the vanishing of the dinosaurs or the origin of our ancestors. Based on what you know of fossils from your textbook and other sources, discuss the role of
  19. English Please Help

    from "When Greek Meets Greek" 1. What can you conclude from the wording of the following text? “One morning Ramkilawansingh (after this, we calling this man Ram) was making a study of the noticeboards along Westbourne Grove what does advertise rooms to
  20. Physics

    On a clear day, the Earth’s atmospheric electric field near the ground has a magnitude of 100 N/C and points vertically down. Inside the ground, the electric field is zero, since the ground is a conductor. Consider a mathematical box of 1.0 m x 1.0 m x
  21. science

    a boat heading due north crosses a wide river with speed of 12km/h relative to the water the water in the river has a uniform speed of 5 km/h due east relative to the earth.determine the velocity of the boat relative to an observer standing on either bank
  22. physics

    How do i find this? A shooting star is a meteor that burns up when it reaches Earth's atmosphere. Many of these meteoroids are quite small. Calculate the kinetic energy of a meteoroid of mass 6.0 g moving at a speed of 45 km/s and compare it to the kinetic
  23. PHYSICS

    A 5.0-kilogram sphere, starting from rest, falls freely 22 meters in 3.0 seconds near the surface of a planet. Compared to the acceleration due to gravity near Earth’s surface, the acceleration due to gravity near the surface of the planet is
  24. science

    1.the modern atomic model includes orbiting the nucleus. which of the following parts of dalton's was disproved by the discovery of the electron atoms are tiny particles atoms cannot be divided into smaller parts atoms have specific mass and size atoms
  25. College Algebra

    Ozone occurs at all levels of Earth's atmosphere. The density of ozone varies both seasonally and latitudinally. At a given city, the density D(h) of ozone (in 10^−3cm/km) for altitudes h between 20 kilometers and 35 kilometers was determined
  26. physics

    1.will hall voltage be same for conductor and semiconductor in hall effect experiment? 2.can hall effect experiment be used for determining earth's magnetic field? 3.what is the importance of hall experiment? 4. can we use intrinsic semiconductor for hall
  27. physics

    A Chinook (King) salmon (Genus Oncorynchus) can jump out of water with a speed of 5.95 m/s. (See Problem 4.9, page 111 for an investigation of how the fish can leave the water at a higher speed that it can swim underwater.) If the salmon is in a stream
  28. mechanics

    A 60 Kg skier leaves the end of a ski-jump ramp with a velocity of 24m/s directed 25° above the horizontal. Suppose that as a result of air drag the skier returns to the ground with a speed of 22 m/s, landing 14m vertically below the end of the ramp. From
  29. physics

    A Chinook (King) salmon (Genus Oncorynchus) can jump out of water with a speed of 5.95 m/s. (See Problem 4.9, page 111 for an investigation of how the fish can leave the water at a higher speed that it can swim underwater.) If the salmon is in a stream
  30. physics

    A 87.2 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 44.2 m behind the ship, at rest relative to the spaceship. The only
  31. Physics

    A 83.5 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 35.5 m behind the ship, at rest relative to the spaceship. The only
  32. physics

    A 87.2 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 44.2 m behind the ship, at rest relative to the spaceship. The only
  33. physics

    n automobile has a vertical radio antenna 1.40 m long. The automobile travels at 30.0 km/h on a horizontal road where Earth's magnetic field is 50.0 µT, directed toward the north and downward at an angle of 65.0° below the horizontal. (a) Specify the
  34. Physics

    On Earth, falling objects accelerate downward at 9.8 meters per second squared. But on another planet, the gravitational acceleration might be quite different. On the Moon, for example, a ball will accelerate at about 1.6 meters per second squared. How
  35. science

    Do aliens and ufo's exist? If they do, do they visiit earth? The word "alien" means foreigner or someone different. In that sense, there are many aliens. Are there intelligent beings on other planets? We don't know. We have no scientific evidence of life
  36. Geography

    For this question, you need to apply what you learned about temperature controls to two locations on Earth. Discuss how the 5 factors influencing temperature patterns effect St. Louis, Missouri (38°39' N, 90°W; elevation 535 ft) and Singapore (1°24'N,
  37. physics

    Approximately 5.5 X10^6 kg of water fall 50m over Niagara Falls each second. a) What is the decrease in the gravitational potential energy of the water-Earth system each second? b) If all this energy could be converted to electrical energy (can’t happen)
  38. physics

    Approximately 5.5 X10^6 kg of water fall 50m over Niagara Falls each second. a) What is the decrease in the gravitational potential energy of the water-Earth system each second? b) If all this energy could be converted to electrical energy (can’t happen)
  39. History

    Which accurately describes Bartolomeu Dias’s impact on future European explorers? europeans learned about the Inca empire of Peru and the city of Machu Picchu European realized they could establish their own trade route to India by sea travel europeans
  40. chem

    Can someone help me with these please? 1) Use water as an example to contrast the properties of a compound with the elements from which it is composed. 2) If you tried to breath carbon dioxide, you would suffocate. Why, then, is carbon dioxide essential to
  41. Language Arts

    1.the decorations were reminiscent of autumn leaves.. -leftovers. -made. -reminders. -symbolic. 2.No buildings still stood at the epicenter.. -government hq. -most important area of the city. -highest ground,usually on a mountain. - point on earth directly
  42. Art- plzz help

    In this image with the trash can, the principles of design 1. Emphasize the message through color and shape 2distract the viewer from the message 3.were created through strong use of texture 4. communicate the message with a large variety of lines. The
  43. PHYSICS 1 ..lab helllpppppppp

    1.described the motion of mud that flies off from a rapidly spinning wheel. 2.explain why the outer rail is higher than the inner rail of curve in a railroad track. 3. a 5kg mass is moving in a circle of a radius 3m at a speed of 30 m/sec.determine the
  44. English: Puritans

    The question is: Why could Winthrop's ideal not be achieved? The paragraph where I have to find the answer: Winthrop describes an ideal society, which, if the Puritans had been able to achieve it, would have been a reasonable facsimile of paradise on
  45. physics

    A 1-kg block is lifted vertically 1m by a boy. The work done by the boy would be one jule or would no work be done. I'm confused, I thought lifting wasn't considered work. The work done is actually about 9.81 joules. Think of gravity pulling on the block
  46. science 8th grade

    ok, i don't have answer to these questions! #8: The interaction of air, water, and _________ causes weather. #9: Violent storms generally form where? #10:clouds form as warm air rises, expands, cools, and becomes saturated, and then _______________
  47. Re-post - Science - from Spitfireredhead

    Posted by SpitFireRedHead on Wednesday, April 27, 2016 at 8:23am. Please check this. Thanks! 1. Which of the following shows fossils as evidence of continental drift? a. Limestone layers in the Appalachian Mountains of North America were exactly the same
  48. Religion

    Many Christians seem to accept modern cosmology - Galileo's view that the earth is not the center of the Universe - while at the same time disagreeing with the theory of evolution. For this discussion, we will focus on the following questions (in 250 words
  49. English

    The extreme poverty of Dakar, Senegal, in “Hip-Hop Planet” is best reflected in which image? a. “When I looked into his eyes, they were bottomless oceans.” b. “. . . it pulled me to the earth like a hundred-pound ring in my nose.” c. “. . .
  50. English

    The extreme poverty of Dakar, Senegal, in “Hip-Hop Planet” is best reflected in which image? a. “When I looked into his eyes, they were bottomless oceans.” b. “. . . it pulled me to the earth like a hundred-pound ring in my nose.” c. “. . .
  51. physics

    How can I calculate the spring constant given only the following: equilibrium length of spring: 10.5 cm stretched length of spring (by attaching a mass): 12.5 cm object's mass: 198.9 grams -please help me...I'm really lost... You need to assume that the
  52. physics

    At New York City, the earth's magnetic field has a vertical component of 5.2 10-5 T that points downward (perpendicular to the ground) and a horizontal component of 1.8 x 10^-5 T that points toward geographic north (parallel to the ground). What is the
  53. English

    A: What do you think of planting trees? 1. I think it is good for health. 2. I think we can live in better places because of the trees. 3. I think we need to plant more trees to live a healthy life. 4. I think we should try our best to preserve the earth
  54. Physics help----------thanks

    A charged cloud system produces an electric field in the air near the Earth's surface. A particle of charge -2.2 10-9 C is acted on by a downward electrostatic force of 3.0 10-6 N when placed in this field. (c) What is the magnitude of the gravitational
  55. English

    Hey, I was wondering if I could get some help looking for figurative language in this poem, like simile, assonance, alliteration, personification, metaphor, onomatopoeia, ext. Thanks! What do I care that the stream is trampled, the sand on the stream-bank
  56. physics!!!

    To monitor the breathing of a hospital patient, a thin belt is girded around the patient's chest . The belt is a 215-turn coil. When the patient inhales, the area encircled by the coil increases by 41.0 cm2. The magnitude of Earth's magnetic field is 50.0
  57. Science

    What are the differences between terrestrial biome and aquatic life zone? A terrestrial biome is on land. An aquatic life zone is in water. Thank you for using the Jiskha Homework Help Forum. Here are some sites for you: 1.
  58. Stoichiometry

    I am taking an online chemistry class and I do not at all understand how on earth how to do stoichiometry. I just don't get it, its not that I don't know how to do the math, but figuring out how to ger the information. PLEASE HELP!! When 11.7 grams of iron
  59. Geography

    I'm writing a paper about sedimentary rocks. My goal is 700 words but I'm stuck. can someone read this and let me know if I'm overlooking some important facts? ************************************* Sedimentary rocks are rocks that have accumulated at the
  60. Science

    [I picked d.] How many species are estimated to be living on earth? a.between 10,000 and 1,000,000 b.between 500,000 and 1 million c.between 1 and 5 million d.between 10 and 50 million http://faculty.plattsburgh.edu/thomas.wolosz/howmanysp.htm This is a
  61. Physics

    In a lightning bolt, a large amount of charge flows during a time of 2.2 10-3 s. Assume that the bolt can be treated as a long, straight line of current. At a perpendicular distance of 28 m from the bolt, a magnetic field of 7.3 10-5 T is measured. How
  62. Science

    For many years it was believed by geologists that the location of the continents was fixed.These scientists believed that the locations of the continents was determined many billions of years ago,as the young Earth cooled down from its original state as a
  63. Earth Science

    What is circumpolar, when it is visible and what are two circumpolar constellations http://en.wikipedia.org/wiki/Circumpolar_constellation http://en.wikipedia.org/wiki/Circumpolar
  64. physics

    Compare the gravitational force on a 35 kg mass at the surface of the Earth (with radius 6.4 × 10 6 m and mass 6 × 10 24 kg) with that on the surface of the Moon  with mass 1 81.3 ME and radius 0.27RE  . What is the force on the moon?
  65. trig

    At the winter solstice, the power, in watts, received from the Sun on each square metre of Earth's surface can be modelled by the formula P = 1000sin (x + 113.5 degrees), where x represents the angle of latitude in the northern hemisphere. a) Determine the
  66. Physics

    A person can jump a horizontal distance of 3.10 m on Earth, where the free-fall acceleration, g = 9.81 m/s2. (a) How far could the person jump on the moon, where the free-fall acceleration is g/6 m (b) How far could the person jump on Mars where the
  67. Earth Science

    If a tree has grown out of the side of a rock cliff and a house was recently built on the land above causing the tree a lot more rain water to run off where the tree lives, it's roots have started to be exposed and are now growing faster and bigger with
  68. Language Arts

    I think that I shall never see A poem lovely as a tree. A tree whose hungry mouth is prest Against the earth’s sweet flowing breast; A tree that looks at God all day, And lifts her leafy arms to pray; A tree that may in summer wear A nest of robins in
  69. physics

    A lizard of mass 3.0 g is warming itself in the bright sunlight. It casts a shadow of 1.6 cm^2 on a piece of paper help perpendicularly to the Sun’s rays. The intensity of sunlight at the Earth is 1.4 x 10^3 W/m^2, but only half of this energy penetrates
  70. Physics

    A lizard of mass 3.0 g is warming itself in the bright sunlight. It casts a shadow of 1.6 cm^2 on a piece of paper help perpendicularly to the Sun’s rays. The intensity of sunlight at the Earth is 1.4 x 10^3 W/m^2, but only half of this energy penetrates
  71. Physics

    Four point charges of 89.67, 16.46, 12.1, and 19.76 microcoulombs are located at the corners of a rectangle of length 42 cm and width of 638 cm, as shown. A sodium ion is placed at the point halfway between 16.46 and 12.1, and then released from rest. What
  72. physics

    A force of 40.0N is required to pull a 10.0kg wooden block at a constant velocity across a smooth glass surface on Earth. What force would be required to pull the same wooden block across the same glass surface on the planet Jupiter.
  73. earth

    #25 seismic waves are similar to sound waves because_______ a/ both are produced by vibrations b/ both are caused by humans c/ they are both produced by radiation d/ seismic waves and sound waves are not similar in any way
  74. Earth Science

    Which organism evolved before the others in geologic time? mammals amphibians reptiles **fish Which type of organism evolved later than the others? **mammals amphibians reptiles fish
  75. physics

    At a track-and-field meet, the best long jump is measured as 8.00 m. The jumper took off at an angle of 46° to the horizontal. (a) What was the jumper’s initial speed? (Neglect air resistance.) 1 m/s (b) If there were another meet on the Moon and the
  76. Earth science

    A scientist wants to determine the age of a rock. The rock contains an index fossil and an ancient relative of a living organism. Which is more useful for dating the rock, and why? Answer: an ancient relative of a living organism would be more useful for
  77. Physics

    You drop a 1.60 kg book to a friend who stands on the ground at distance D = 12.0 m below. If your friend's outstretched hands are at distance d = 1.40 m above the ground (see the figure), (a) how much work Wg does the gravitational force do on the book as
  78. physics

    The moon's diameter is 3.48 106 m, and its mean distance from the earth is 3.85 108 m. The moon is being photographed by a camera whose lens has a focal length of 48.5 mm. (a) Find the diameter of the moon's image on the slide film. (b) When the slide is
  79. Physics

    You ride your bicycle down a hill, maintaining a constant speed the entire time. 1. As you ride, does the gravitational potential energy of the Earth-bike-rider system increase, decrease, or stay the same? 2. Does the kinetic energy of you and your bike
  80. Geology

    What do you call Ignous rocks that form under the surface? Mary, igneous rocks are called fire rocks-underground,they are formed when the melted rock, called magma, deep within the earth becomes trapped in small pockets.As these pockets of magma cool
  81. science

    A British Concorde (BC) and a French Concorde (FC) flew in opposite directions around the earth (40 000 km). The BC covered half of its flight distance at a supersonic speed of 2500 km/h and the other half at a subsonic speed of 1000 km/h. The FC spent
  82. Science-bobpursley/Ms.Sue

    1. A trilobite is considered an index fossil because this organism existed during a limited period in Earth's history. That means that any fossil located in a layer of rock beneath a layer containing trilobite fossils is ____________ than a trilobite. 2.
  83. Science check my answers

    Which of the following is not needed to make a model of the water cycle? an energy source water a closed container a drain Which of the following explains why water is a limited resource? Water is present on Earth in a fixed amount that does not change.
  84. Physics

    The space shuttle, with an initial mass M = 2.41×106 kg, is launched from the surface of the earth with an initial net acceleration a = 26.1 m/s^2. The rate of fuel consumption is R = 6.90×103 kg/s. The shuttle reaches outer space with a velocity of vo =
  85. 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
  86. Science, NATS

    Consider the following chemical reaction. Molecular hydrogen and carbon dioxide react to form water and methane. H2+CO2-->H2O+CH4 A)Explain why this equation is not balanced and what law of nature does it break in its current form? B) Astronauts from
  87. math

    The distance that light travels in 1 year (a light year) is 5.88 times 10 Superscript 12 miles. If a star is 4.6 times 10 Superscript 7 light years from Earth, what is this distance in miles? Enter your answer in scientific notation. Round the coefficient
  88. 11th grade

    Four point charges of 89.67, 16.46, 12.1, and 19.76 microcoulombs are located at the corners of a rectangle of length 42 cm and width of 638 cm, as shown. A sodium ion is placed at the point halfway between 16.46 and 12.1, and then released from rest. What
  89. astronomy

    At your telescope, you measure the parallax of the star Regulus to be one-half of the parallax of the star Denebola. What do you immediately know about their relative distance from us? a) That Regulus is further away than Denebola. b) That Regulus is
  90. Earth Science

    Two different areas of the United States receive the same amount of rainfall during a day. Area A has soil that contains many large pores and rocks made of sandstone. The soil in Area B is mainly heavy clay. Area A is a desert. Area B is a swamp. For each
  91. Water cycle question

    The planet is covered by 97% ocean water. What would the global water cycle look like if the earth were covered by 50% ocean water?
  92. Algebra

    Astronomers measure large distances in light-years. One light-year is the distance that light can travel in one year, or approximately 5.88 × 10*12 miles. Suppose a star is 9.8 × 10^1 light-years from Earth. In scientific notation, approximately how many
  93. earth science please help ....

    How would the seperation between the p wave and s wave arrival at Savannah, GA compare to the data from the seismograph recorded in chicago, Il. the recorded for the chicago is: CHicago: P wave arrival time: 08:57:45 pm s wave arrival time: 09:02:05 pm
  94. Math

    Because of the Earth’s curvature, a person can see a limited distance to the horizon. The higher the location of the person, the farther the person can see. The distance D in miles to the horizon can be estimated by D(h)=1.22√h, where h is the
  95. PHYSICS!!!!HELP PLEASE

    A spring scale being used to measure the weight of an object reads 17.1 N when it is used on earth. The spring stretches 4.40 cm under the load. The same object is weighed on the moon, where gravitational acceleration is 1 /6 g. Find the reading of the
  96. physicss

    A spring scale being used to measure the weight of an object reads 17.1 N when it is used on earth. The spring stretches 4.40 cm under the load. The same object is weighed on the moon, where gravitational acceleration is 1 /6 g. Find the reading of the
  97. PHYSICS *_* HELP PLEASE

    A spring scale being used to measure the weight of an object reads 17.1 N when it is used on earth. The spring stretches 4.40 cm under the load. The same object is weighed on the moon, where gravitational acceleration is 1 6 g. Find the reading of the
  98. physics

    Challenger Deep in the Marianas Trench of the Pacific Ocean is the deepest known spot in the Earth's oceans, at 10.922 km below sea level. Taking density of seawater at atmospheric pressure (p0 = 101.3 kPa) to be 1024 kg/m3 and its bulk modulus to be B(p)
  99. science

    thanks for the other info but im still stuck on one...i think the answer would be that there would be no seasons at all but i think i need a little more information. please help! question: how would seasons on earth be different if there was no axial tilt?
  100. Earth Science

    1. We start with 400 atoms of Uranium-238. How many remain after 4.5 billion years? _______ After 9 billion years? _______ After 13.5 billion years? ________ 2 . How long will it take for ½ of the original amount of Rubidium-87 to decay? _______ 3.