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Homework Help: Science: Earth

Recent Homework Questions About Earth

Physics
A comet with a mass of 7.95 1011 kg strikes Earth at a speed of 22 km/s. (a) Find the kinetic energy of the comet in joules. ____ J (b) Compare the work that is done by Earth in stopping the comet to the 4.2 1015 J of energy that was released by the largest nuclear weapon ever...
Thursday, February 18, 2010 by Dar

the outer planets
I am working on a crossword that asks what is 4 times the diameter of Earth. Can you help with this?
Thursday, February 18, 2010 by Trevor

science on weather
how would earth be affected if its axis were not titled?
Thursday, February 18, 2010 by Anonymous

Earth Science
Upon what measurement is the Earth's latitude and longitude system based?
Thursday, February 18, 2010 by Kate

chemistry
even every air can be changed in to liquid at certain pressure and temperature, why our earth tend to change water at gaseous state to liquid state and by what conditions?
Thursday, February 18, 2010 by karthika

physics
A bag of sugar weighs 6.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth?
Wednesday, February 17, 2010 by mel

math
People weigh 6 times as much on Earth as they do on the moon.Mr.Marks weighs 180 pounds on Earth.How much would he weigh on the moon?
Wednesday, February 17, 2010 by Thanh

*Science*
Are meteroties large lumps of trapped rock/metal which actually reach the earth's surface?
Wednesday, February 17, 2010 by Sara

Scientific studies
A helicopter is ascending vertically with a speed of 5.20m/s. At a height of 125 m above the Earth, a package is dropped from a window. How much time does it take fo the package to reach the ground? [Hint: The package's initial speed equals the helicopter's}
Wednesday, February 17, 2010 by Aly

Biology
29. CFCs are a problem because they a. have been released in large quantities in the past b. break down to reactive free chlorine atoms c. attack ozone molecules in the upper atmosphere d. all of the above D? 10. Ozone depletion in the atmosphere a. leads to the formation of ...
Tuesday, February 16, 2010 by mysterychicken

English
Can you check these sentences for me, please? 1)He is a superstar now and he is slamming (a synonym?) on his guitar. 2)He is responsible for the building (?) of Westminster Abbey. 3)He withdrew from Britain to defend Rome against (or from?) a Barbarian attack. 4)According to ...
Tuesday, February 16, 2010 by Franco

Geography
(continued from yesterday) Eastern Europe. Where on Earth? Sept. 18: Traveled south and arrived today in the town associated closely with Hans Christian Andersen. Weather here a bit rainy, but we're having too much fun to care! (Odense, Denmark?)
Tuesday, February 16, 2010 by y912f

Physics
A bike is hanging from a hook in a garage. You need to consider the following forces. (a) The force of the Earth pulling down on the bike. (b) The force of the bike pulling up on the Earth. (c) The force of the hook pulling up on the bike. (d) The force of the hook pulling ...
Tuesday, February 16, 2010 by Max

Science-Help
How is a meteor and astroid similar? Meteors and asteroids are both rocks from space that sometimes hit the earth. They may be made from ice. How are they different? Meteors are known as shooting stars. They move very fast across the sky. Asteroids are found in the asteroid ...
Monday, February 15, 2010 by Sara

Chemistry
It is estimated that uranium is relatively common in the earth’s crust, occurring in amounts of 4 g/metric ton. A metric ton is 1000 kg. At this concentration, what mass of uranium is present in 1.0 mg of the earth’s crust?
Monday, February 15, 2010 by Leo

Geography
Where on Earth? Postcards form Europe Your neighbors, the Wiltons, have gone away on vacation to Europe. Before they left, Mrs. Wilton told all fo the neighbors, "We'll be sending lots of postcards. Try to figure out where each card came form. If you do, we'll throw a block ...
Monday, February 15, 2010 by y912f

Physics
A bike is hanging from a hook in a garage. You need to consider the following forces. (a) The force of the Earth pulling down on the bike. (b) The force of the bike pulling up on the Earth. (c) The force of the hook pulling up on the bike. (d) The force of the hook pulling ...
Monday, February 15, 2010 by Max

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 1.0 m, half below the ...
Sunday, February 14, 2010 by Amy

Science
What are neap tides, and why do they occur? Neap tides are the weaker tides. They occur when the sun and the moon are perpendicular to each other with respect to earth. Please correct me if I'm wrong, thanks
Wednesday, February 10, 2010 by Sara

Science
what are spring tides and how do they occur? Spring tides are are very high tides which occur when the sun, moon, and earth form a straight line. Please correct me if I'm wrong, thanks :-)
Wednesday, February 10, 2010 by Sara

Science
What are tides and how are they caused? Tides are the alternate rises and falls of large bodies of water. They are caused by the gravitational interaction between the Earth and the Moon. Please correct me if I'm wrong, thanks
Wednesday, February 10, 2010 by Sara

Science
Are the phases of the moon caused by Earth's shadow cast on the moon? No, the phases of the moon are caused by the alignment of the moon and sunin the sky. Please correct me if I'm wrong, thanks
Wednesday, February 10, 2010 by Sara

Science
Why is only one side of the moon visible from the earth at all times? Only one side of the moon is visible from the earth at all times because the other side is illuminated by the sun, which doesn't face us. Please correct me if I'm wrong, thanks :-)
Wednesday, February 10, 2010 by Sara

college
The earth exerts a force of 2500 N on an or- biting communications satellite that is 30 mi above the Earth. What is the magnitude of the force the satellite will exert on the earth? Answer in units of N.
Wednesday, February 10, 2010 by zero

chemistry
1. Which of the following statements about the cell theory is correct? a) All living organisms are made up of one or more cells. b) All cells arise from other, pre-existing cells c) All eukaryotic cells contain symbiotic prokaryotes. d) All prokaryotic cells contain symbiotic ...
Wednesday, February 10, 2010 by jen

science
At what height above the earth is the acceleration due to gravity 12% of its value at the surface?
Monday, February 8, 2010 by mia

Science
The cause of the seasons on Earth is often mistakenly attributed to the elliptical orbit of Earth around the sun. What is the actual cause of the seasons? Tha actual cause of the seasons is because of the tilt of Earth's axis. please correct me if i'm wrong, thanks :-)
Monday, February 8, 2010 by Sara

Science
I want to see earth in satellite image. I know about google and wikimapia, are there any other sites that have satellite images for you to see for free?
Monday, February 8, 2010 by Sara

Science
The cause of the seasons on Earth is often mistakenly attributed to the elliptical orbit of Earth around the sun. What is the actual cause of the seasons? Tha actual cause of the seasons is because of the tilt of Earth's axis. please correct me if i'm wrong, thanks :-)
Monday, February 8, 2010 by Sara

physics
Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the United States in one year is about 9.33 109 J. cannot_evaluate cannot_evaluate J (b) Calculate the kinetic energy that the earth has because...
Monday, February 8, 2010 by zeta

Environmental Science
I need a little help on these, i've posted them a few times but i don't get any answers. 29. A common feature of thermal pollution and artificial eutrophication is that they both a. have sources that are difficult to identify and control b. cause large mats of algae to bloom ...
Monday, February 8, 2010 by y912f

Physics
Near the surface of the Earth there is an electric field of about V=150 V/m which points downward. Two identical balls with mass m= 0.550 kg are dropped from a height of 2.30 m, but one of the balls is positively charged with q1= 800 microCoulombs , and the second is ...
Sunday, February 7, 2010 by Ambrie

Physics
Near the surface of the Earth there is an electric field of about V=150 V/m which points downward. Two identical balls with mass m= 0.550 kg are dropped from a height of 2.30 m, but one of the balls is positively charged with q1= 800 microCoulombs , and the second is ...
Sunday, February 7, 2010 by Ambrie

Science -CLIMATE
Explain how different temperatures on earth create winds.
Sunday, February 7, 2010 by Nick

science
In 4th grade science, How could measuring the orbit of a comet help scientists understand when it will next be visible from Earth?
Sunday, February 7, 2010 by Andrea

space
how much power would the entire earth radiate if it did not have an atmosphere
Sunday, February 7, 2010 by Anonymous

provine
How does the tilt of the earth affect climate
Sunday, February 7, 2010 by k

Science-Damon
Describe how the movement of Earth is responsible for day and night. The movement of earth is responsible for day and night because as it rotates counterclockwise we tend to have this result. The part of earth that faces the sun experiences daylight, and the part that faces ...
Saturday, February 6, 2010 by Sara

Physics
Calculate the speed needed by a spacecraft to maintain a circular orbit at about 350 km above Earth’s surface. (it's a project where we create our own spaceship. let's say the craft is 500kg) --- Not sure about the formula to find this. All I know is that it may have ...
Saturday, February 6, 2010 by Ben

Science-Repost
Describe how the rotation of Earth is responsible for the movement of the stars. The rotation of earth is responsible for the movement of stars because as it rotates, objects around it rotate as well, such as planets, they appear to move through the stars because they are that...
Saturday, February 6, 2010 by Sara

Science-Repost
Describe Earth's rotation in terms of its axis and length of time to rotate. Earth's axis has never pointed in the same direction. It slowly traces a circle every 26 000 years. The tilt of the earth's axis isn't usually pointing straight up. It traces a circle and it tends to ...
Saturday, February 6, 2010 by Sara

Science
If you were to look down on Earth from above the North Pole, in which direction would Earth appear to rotate? If you were to look down on Earth from above the North Pole, then earth would appear to rotate in a counter-clockwise direction. More info would be appreciated, thanks.
Friday, February 5, 2010 by Sara

Science
Describe how the movement of Earth is responsible for day and night. The movement of earth is responsible for day and night because as it rotates counterclockwise we tend to have this result. The part of earth that faces the sun experiences daylight, and the part that faces ...
Friday, February 5, 2010 by Sara

Science
Describe Earth's rotation in terms of its axis and length of time to rotate. The earth's axis slowly changes in the way it points. It changes direction over time. One effect of this precession, is the changing position of the North Celestial Pole. It takes 26 000 years to ...
Friday, February 5, 2010 by Sara

Science
Describe how the rotation of Earth is responsible for the movement of the stars. The rotation of earth is responsible for the movement of stars because as it rotates, objects around it rotate as well, such as planets, they appear to move through the stars because they are that...
Friday, February 5, 2010 by Sara

Physics
An electron is relased into a uniform electric field of magnitude 8.35 N/C. How many times larger is this electrons acceleration than the acceleration due to gravity on the surface of Earth? Is it just F= qE = ma (for the electron, and using E for electric field), and then ...
Friday, February 5, 2010 by ggget PHYSICal

chem.
How much heat would be required to warm Earth's oceans by 1.0 degree celsius ? Assume that the volume of Earth's oceans is 137x10^7 km^3 and that the density of seawater is 1.03 g/cm^3. Also assume that the heat capacity of seawater is the same as that of water. Earth's oceans...
Friday, February 5, 2010 by Al

chemistry
Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere. Earth's oceans, because of their high heat capacity, can absorb heat and therefore act to slow down global warming. ...
Friday, February 5, 2010 by Al

earth science
what glaciers no longer exist in alaska?
Friday, February 5, 2010 by pat

physics
A canoe has a velocity of 0.490 southeast relative to the earth. The canoe is on a river that is flowing at 0.520 east relative to the earth creating a 45 degree angel between the two velocities.Find the magnitude of the velocity of the canoe relative to the river.
Wednesday, February 3, 2010 by Anonymous

Biology
Why was the discovery of microspheres and coacervates an important contribution to the understanding of how life might have originated on Earth?
Wednesday, February 3, 2010 by brooke

astronomy
Astronauts on the Moon look back at Earth, a distance of about 400,000 km away. If the cities of Washington, D.C. and New York are separated by 300 km, what will be the angle between them when viewed from the Moon?
Wednesday, February 3, 2010 by laura

Physics
the temperature at the surface of the sun is approximatly at 5700K and the temperature at the surface of the earth is approxiamtly 290 K. what entropy change occurs when 1100 J of energy is transfered by radiation from the sun to the earth?
Tuesday, February 2, 2010 by jenn

Environmental Science
are these correct? 29. A common feature of thermal pollution and artificial eutrophication is that they both a. ave sources that are idfficult to identify and control b. cause large mats of algae to bloom in fresh water c. are a result of power plants and other industrial ...
Monday, February 1, 2010 by y912f

Physics
At a place directly below a thundercloud, the induced electric charge on the surface of the Earth is +1.0 X 〖10〗^(-7) coulomb per square meter of surface. How many singly charged positive ions per square meter does this represent? The number of atoms on the ...
Monday, February 1, 2010 by Josslyn

Chemistry
Which of the following surfaces does a true monolayer always form on? A. silicon B. gold C. both D. neither Why are silicon surfaces studied in this experiment? A. Silicon is shiny like the windows in tall buildings. B. Silicon more closely represents environmentally relevant...
Saturday, January 30, 2010 by Ann

Earth Science
Tomorrow will be sunny with high clouds. What does this statement describe?
Saturday, January 30, 2010 by Mike

physics
The spectrum of light from the galaxy M100 has a prominent dark line at a wavelength of 592.2 nm. The same spectral line observed in a lab on earth has a wavelength of 589.4 nm. How fast is M100 moving relative to earth? (the speed of light = 3.00 x 108ms-1)
Friday, January 29, 2010 by Mota

Earth science
Please go over my answers and tell me what I got wrong... Telling me the correct answer would also be nice please hurry I only have 20 mins What does the principle of uniformitarianism tell us about the past? (Points: 5) The past is the key to the future. X The present is the...
Friday, January 29, 2010 by Ario

earth science
if you didn't know these cities were all cities of the United States, how could you tell from the temperature curves that they were all in the Northern Hemisphere?
Thursday, January 28, 2010 by susan

Earth Science
Which of the following help create volcanoes? plate tectonics landslides cracks in Earth's crust built up magma
Thursday, January 28, 2010 by help

social studies
what were the lines of defence dug into the earth? and what was willsons plan for peace?
Wednesday, January 27, 2010 by selena

Environmental Science
29. A common feature of thermal pollution and artificial eutrophication is that they both a. have sources that are difficult to identify and control b. cause large mats of algae to bloom in fresh water c. are a result of power plants and other industrial activity d. decrease ...
Wednesday, January 27, 2010 by y912f

math
I have a math problem. A Mars year is 1.88 Earth years. If you are 13 years old in Earth years, about how would you be in Mars in Mars years? Thanks
Tuesday, January 26, 2010 by jared

science
What do earth`s plates float on?
Tuesday, January 26, 2010 by Sarah

PHYSICS-radiation
Four billion years ago the Sun’s radiative output was 30% less than it is today. (i) If we assume the radius of the sun is the same, and that the Earth’s atmosphere was the same as it is now (that is, the atmosphere absorbs 10% of the incoming solar radiation and 80% of ...
Sunday, January 24, 2010 by RANI

Geology
Can someone help me with these questions I have some material for them but not enough. • First-- Compare and contrast the geological features of a desert landscape and glacial landscape. Describe at least one process that creates the resulting landforms of each. Second--• ...
Sunday, January 24, 2010 by Jen

Physics: fictitious forces
A plumb bob does not hang exactly along a line directed to the center of the Earth's rotation. How much does the plumb bob deviate from a radial line at 39.0° north latitude? Assume that the Earth is spherical. This was in my textbook with an angle of 35 instead of 39 and the...
Sunday, January 24, 2010 by ucieng

English I
Respond to the question presented by the poet. "..if there were a fire in a museum which would you save, a Rembrandt painting or an old woman who hadn't many years left anyhow?" Explain your answer. "Ethics" In ethics class so many years ago our teacher asked this question ...
Sunday, January 24, 2010 by Candace

PHYSICS
Four billion years ago the Sun’s radiative output was 30% less than it is today. (i) If we assume the radius of the sun is the same, and that the Earth’s atmosphere was the same as it is now (that is, the atmosphere absorbs 10% of the incoming solar radiation and 80% of ...
Sunday, January 24, 2010 by Sunshin3

physics
how does the gravitational force exerted by earth on the sun compare with the gravitational force exerted by sun on the earth? and would you expect tides to be higher at the equator or at the north pole? why?
Sunday, January 24, 2010 by amar

physics
A car travels due east with a speed of 35.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 40.0° with the vertical. Find the velocity of the rain with respect to the ...
Sunday, January 24, 2010 by Michelle

PHYSICS
1. It is believed that in the Archeaneon (2.5-4 billion years ago) the sun’s radiative output was 30% less than it is today. (i) What would the temperature of the sun have been at that time? (ii) At what wavelength would the peak emission from the sun have been? (iii) ...
Saturday, January 23, 2010 by HELP! PLEASE!

Physics
A plumb bob does not hang exactly along a line directed to the center of the Earth's rotation. How much does the plumb bob deviate from a radial line at 38.5° north latitude? I got my answer to be 0.122288439 deg but it was incorrect. I used theta= a(sin 38.5)/g (which ...
Saturday, January 23, 2010 by Anonymous

PHYSICS- SCIENCE
1. It is believed that in the Archeaneon (2.5-4 billion years ago) the sun’s radiative output was 30% less than it is today. (i) What would the temperature of the sun have been at that time? (ii) At what wavelength would the peak emission from the sun have been? (iii) ...
Saturday, January 23, 2010 by Sheena

Science
1. It is believed that in the Archeaneon (2.5-4 billion years ago) the sun’s radiative output was 30% less than it is today. (i) What would the temperature of the sun have been at that time? (ii) At what wavelength would the peak emission from the sun have been? (iii) ...
Saturday, January 23, 2010 by Sheena

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 her hair; Upon whose ...
Saturday, January 23, 2010 by Anonymous

Physics
Your dog has been diagnosed with a terminal illness for which there is no cure. The Veterinarian expects that it will live for 1 year before it succumbs to the condition. You have the idea that if you could keep the dog alive a little longer, a cure might be found. You decide ...
Friday, January 22, 2010 by Jon

space
What is the force of gravity at 220 miles above Earth's surface? Calculate how much of a g force the astronauts are actually experiencing. The solution for this math problem is a percentage. You can calculate it using the Algebraic equation: gr = R2/r2 x g R = the radius of ...
Thursday, January 21, 2010 by Annie

physics
what happens to acceleration due to gravity if you climb the tallest mountains on the earth ?
Thursday, January 21, 2010 by brittany

Science
Talking about Yellowstone National Park Native Amiercans referred to Yellowstone as a place where _______________ General _______________ was the first to name many of the geysers Yellowstone is the result of a _______ _________ tat came up from the Earth's mantle.
Wednesday, January 20, 2010 by Ime

College Chemistry
So i been trying to solve this question like for ever! so i hope you guys can help me , here is the question : the volume of a seawater on earth is about 330,000,000 mi3. if seawater is 3.5% sodium chloride by mass and has a density of 1.03g/mL, what is the approximate mass of...
Tuesday, January 19, 2010 by Tasneem

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 = 5.98×1024 kg; mass of moon...
Tuesday, January 19, 2010 by Andy

physics
The engine of a toy rocket supplies an average acceleration of 38.0 m/s/s to the rocket for an interval of 0.80 s. A.)If the toy roocket is launched vertically, how high does it rise in this interval? B.) How fast is the rocket moving at the end of 0.80 s? C.) What altitude ...
Tuesday, January 19, 2010 by Kendra

Environmental Sciencee
2. The water resources of the Earth are located in a. salt water fround in the ocean b. fresh water found in icecaps and glaciers c. fresh water found in rivers, lakes, and streams d. all of the above D
Tuesday, January 19, 2010 by y912f

Environmental Sciencee
Please help me on this question: 33. Wind and water alter the Earth's sufrface by a. blowing away soil and eroding soft rocks b. eroding coastlines c. carving deep gorges d. all of the above I read about this a long time ago, so I don't even remember where it is in my book. ...
Tuesday, January 19, 2010 by y912f

science
Using this concept, what role do we each play in sustaining life on Earth? How do our food choices affect our own consumption of the nonrenewable energy available to sustain life?
Tuesday, January 19, 2010 by Barb

3rd grade science
Solar System Project: I would like to know if the moon is between earth and mars. I am making a shoe box model of the solar system. I have to put the planets in order. That's all I need to know. Thanks a bunch!!!
Monday, January 18, 2010 by Miranda

earth
Sometimes streams and rivers run in fairly straight lines. Sometimes, they meander or curve and wander. What is your idea about how faster water affects the shape of a stream or river? A) Faster streams are straighter. B) Faster streams curve more. C) The speed of the stream ...
Monday, January 18, 2010 by Sarah

physics
Newton assumed that a gravitational force acts directly between Earth and the Moon. How does Einstein's view of the attractive force between the two bodies differ from Newton's view?
Saturday, January 16, 2010 by kendra

physics
during space flight, astronauts often refer to forces as multiples of the force of gravity on earth's surface. what does a force of 5g mean to an astronaut?
Saturday, January 16, 2010 by kendra

Thomas Paine
The cause of America is in a great measure the cause of all mankind. Many circumstances hath, and will arise, which are not local, but universal, and through which the principles of all Lovers of Mankind are affected, and in the Event of which, their Affections are interested...
Saturday, January 16, 2010 by Kelly

earth
A man with a weight of 1000 newtons on earth visits each planet what is his weight on each?
Saturday, January 16, 2010 by Anonymous

space
why cant petrol driven cars we use on earth be used on the earth?
Saturday, January 16, 2010 by Anonymous

earth
1) On a horizontal straight line graph of distance (vertical axis) against time, which variable is not changing? a) Distance b) Time c) Wind speed d) Temperature 2) A graph of distance against time is a straight line with a slope of 1. If you wait for 3 time units to pass, how...
Friday, January 15, 2010 by Sarah

english
what is being said in the following line:   “Foul devil, for God’s sake, hence, and trouble us not; For thou hast made the happy earth thy hell, Fill’s it with cursing cries and deep exclaims.”
Friday, January 15, 2010 by kim

physics(universal law of gravitation)
a satellite has a mass of 100 kg and is located at 2 x 10^6 m above the surface if the Earth. wHAT is the potential energy associated with the satellite at this location? What is the magnitude of the gravitational force on the satellite?
Thursday, January 14, 2010 by Nina

Earth Science
Plinian eruptions are the most powerful type of eruption. They are usually caused_______magma. A)rhyolitic B)bybasaltic C)andesitic
Thursday, January 14, 2010 by george

Precalculus
Can someone check my answers please? Thank you :) 30. What is Earth's rotational speed at (a) Bangor, Maine (latitude 45 degrees N) and (b) Rio de Janeiro, Brazil (latitude 23 degrees S)? (It's given in the problem also that Earth's rotational speed at the equator is about 1,...
Wednesday, January 13, 2010 by Emily

AP English
From The Great Gatsby by Fitzgerald Tom flung open the door, blocked out its space for a moment with his thick body, and hurried into the room. “Mr. Gatsby!” He put out his broad, flat hand with well-concealed dislike. “I’m glad to see you, sir. . . . Nick...
Tuesday, January 12, 2010 by Priscilla

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Homework Help: Science

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