Homework Help: Science: Earth

Recent Homework Questions About Earth

Geometry
A satellite in a nearly circular orbit is 2000 km above Earth's surface. The radius of Earth is approximately 6400 km. If the satellite completes its orbit in 112 hours, calculate the speed of the satellite in kilometers per hour. Please help me. I have a math test tomorrow.
Sunday, January 23, 2011 at 2:14pm

Geology
How does the geothermal gradient vary with depth within the Earth?
Sunday, January 23, 2011 at 1:49pm

math
In 2001, Windsor, Ontario received its maximum amount of sunlight, 15.28 hrs, on June 21, and its least amount of sunlight, 9.08 hrs on December 21. a. Due to the earth’s revolution about the sun, the hours of daylight function is periodic. Determine an equation that can ...
Sunday, January 23, 2011 at 1:28pm

physical science
How many hours are required for a radio signal from a space probe near the dwarf planet Pluto, 6.00 x 10 (to the 9th) km away, to reach Earth? Assume that the radio signal travels at the speed of light, 3.00 10 (to the 8th) m/s.
Saturday, January 22, 2011 at 8:04pm

Life science
That portion of the earth in which living organisms are found?
Saturday, January 22, 2011 at 2:00pm

Physics
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 ...
Saturday, January 22, 2011 at 10:44am

science
This is for a bonus if we want to answer it. Can you see if it is correct? State in one sentence the most significant discovery that geologists established through their study of plate tectonics. Here goes- The most significant discovery is that the Earth's plates are ...
Thursday, January 20, 2011 at 8:36pm

science
Classify these layers of the Earth as liquid, solid, or solid but able to flow slowly: crust, lithosphere, asthenosphere, outer core, inner core. Crust=solid, Lithosphere= solid but able to flow slowly, Asthenosphere=liquid, Outer core= solid but able to flow slowly, Inner ...
Thursday, January 20, 2011 at 8:22pm

earth science
How are trenches related to plate boundaries? How are trenches explained by the theory of plate tectonics?
Thursday, January 20, 2011 at 7:39pm

Earth Science
Using the plate tectonic theory explain the differences between the continental shelves on the east and west coasts of South America.
Thursday, January 20, 2011 at 7:36pm

precalculus
The acceleration acting on a falling object due to gravity varies inversely with the square of the object's distance from the center of Earth. At the surface of Earth, where x = 1 Earth radius, the acceleration is y = 9.8 m/s2 1. Use the multiply-multiply pattern of power ...
Thursday, January 20, 2011 at 2:46pm

Biology
I don't know any info an the first semester and midterms are tomorrow please help ( Populations, Communities, and Ecosystems Chemistry of Living Things History of Life on Earth: The First Simple Cells History of Life on Earth: Complex Cells Cells and Their Environment ...
Wednesday, January 19, 2011 at 9:57pm

Science
I need help answering with the below question please What are three ways resources are brought up from under Earth's Surface? Thanks!
Wednesday, January 19, 2011 at 7:38pm

physics
'the mass of the Earth is approximately 80 times the mass of the moon and the earth's radius 3.7 times that of the moon. if the acceleration of free fall on the Earth is 10 ms2. estimate its value on the moon'
Wednesday, January 19, 2011 at 7:17pm

Physics
The shuttle is orbiting the earth at a distance of 500km above the earths surface. Assumingan astronaut has a mass of 72kg, what is the force of gravity upon him or her? You may assume the earth has a mass of 5.98 x 10^24kg and a radius from the center to the surface of 6....
Wednesday, January 19, 2011 at 2:45pm

8th grade science
For my quiz some of these questions confuse me. Your genome is over 99% identical to every other human on earth. True False 3 points Save All living things on earth share certain identical sequences of bases on their genome. True False and... Question 8 3 points Save The bases...
Wednesday, January 19, 2011 at 11:20am

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?
Monday, January 17, 2011 at 7:03pm

grade nine space
What is the difference between the terms rotation and revolution? I need to use the Earth to support my answer.
Monday, January 17, 2011 at 4:07pm

physical science
the attraction or pull of a person"s body toward the earth by the earth is called weight.the reaction to this force is the:
Monday, January 17, 2011 at 3:56pm

chemistry
On average, earth's crust contains about 8.1% aluminum by mass. If a standard 12-ounce soft drink can contains approximately 15.0g of aluminum, how many cans could be made from one ton of the Earth's crust?
Monday, January 17, 2011 at 1:36pm

physics
on the surface of earth, a spacecraft has a mass of 2.00x10^4 kilograms. What is the mass of the spacecraft at a distance of one earth radius above earths surface?
Sunday, January 16, 2011 at 5:36pm

Science
why is it necessary for water, carbon, nitrogen and oxygen to be recycled through the earth's ecosystem?
Saturday, January 15, 2011 at 1:46pm

chemistry
I got E) for the first and couldn't figure out the other one. Can any one verify the first and help with the second?? In which of the following processes is there a decrease in the potential energy of the substances involved? A) a coil spring is compressed B) two ...
Thursday, January 13, 2011 at 10:05pm

earth
what is an eleven letter word produced by geothermal plant
Thursday, January 13, 2011 at 4:23pm

Physics
How would the speed of Earth’s orbit around the sun change if Earth’s distance from the sun increased by 4 times?
Thursday, January 13, 2011 at 1:09pm

earth science
what's a good topic sentence and conclusion for why do they call oil and natural gas fossil fuels?
Wednesday, January 12, 2011 at 11:09pm

earth science
why do they call oil and natural gas "fossil" fuels?
Wednesday, January 12, 2011 at 9:56pm

Physics
Because Earth's rotation is gradually slowing, the length of each day increases: The day at the end of 1.0 century is 1.0 ms longer than the day at the start of the century. In 72 centuries, what is the total (in hours) of the daily increases in time (that is, the sum of ...
Wednesday, January 12, 2011 at 9:53pm

Physics
A unit of area often used in measuring land areas is the hectare, defined as 104 m2. An open-pit coal mine consumes 99 hectares of land, down to a depth of 28 m, each year. What volume of earth, in cubic kilometers, is removed in this time?
Wednesday, January 12, 2011 at 9:18pm

earth science
how did the extinction of dinasaurs allow for the evolution of more complex creatures, such as human beings?
Wednesday, January 12, 2011 at 6:30pm

Science
A day on Pluto lasts 6.39 times longer than a day in earth.If an Earth day lasts 24 hour how many hours is a day in Pluto?
Wednesday, January 12, 2011 at 6:18pm

earth science
how did the extinction of the dinasaurs allow for the evolution of more complex creatures, such as human beings?
Wednesday, January 12, 2011 at 6:03pm

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. the atmosphere act ...
Wednesday, January 12, 2011 at 12:38pm

science
what would happen if inertia was the only force being acting on the earth?
Wednesday, January 12, 2011 at 9:38am

PHYSICS
HOW DO U COMPUTE g USING THE EQUATION g=GM/r^2 WHEN GIVEN THE QUESTION IN THIS FORM: "COMPUTE g AT A HEIGHT OF 4 RE ABOVE THE SURFACE OF EARTH" -basically how can i find the answer to a question given in this form
Tuesday, January 11, 2011 at 11:03pm

Physics
What's earth's rotation period?
Tuesday, January 11, 2011 at 9:19pm

Plate Movement
What parts of earth's interior are involved in a convection current? The mantle. Core. Is that right?
Tuesday, January 11, 2011 at 8:27pm

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 Earth's outer ...
Tuesday, January 11, 2011 at 8:09pm

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?
Tuesday, January 11, 2011 at 7:57pm

science
on a planet whose mass is twice that of earth and whose radius is the same, with what acceleration will a body fall at sea level
Tuesday, January 11, 2011 at 1:12am

science
if earth is one astronomical unit from the sun and has a period of 1 year, approximately how far is planet X form the sun if it has a period of 26 yearS
Tuesday, January 11, 2011 at 1:08am

physics
on a planet whose mass is twice that of earth and whose radius is same, with what acceleration will a body fall at sea level?
Monday, January 10, 2011 at 11:38pm

physics
what is tangential velocity of the earth as it travels in its orbit around the sun?
Monday, January 10, 2011 at 11:01pm

space
the pull of gravity between earth and the sun acts across how many kilometers of space.
Monday, January 10, 2011 at 9:08pm

science
if an astraunout could jump 40 cm on jupiter how high could he ir she jump on earth how about the moon also????? pleese help me im stuck on this question
Sunday, January 9, 2011 at 7:44pm

physics
Somewhere between the Earth and the Moon, the gravitational pull exerted by these two bodies on a space pod would cancel. Is this location nearer the Earth or nearer the Moon? A) Nearer the Earth. B) Nearer the Moon. C) At the half-way point.
Saturday, January 8, 2011 at 10:25pm

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 way to return to the...
Saturday, January 8, 2011 at 6:10pm

Physics
A 10 kg crate is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling force is 86 N parallel to the incline, which makes an angle of 30 ° with the horizontal. Assuming the coefficient of kinetic friction is 0.4 and the crate is pulled a distance of 7.5 ...
Wednesday, January 5, 2011 at 8:17pm

Dynamic Earth
In Egypt, the Great Pyramids of Giza face slightly east of true north. Explain why the pyramids might not line up with true north as builders likely intended. Assume that the builders 4500 years ago could determine directions accurately. I tried searching internet for this ...
Wednesday, January 5, 2011 at 7:41pm

Physics-Please check
Posted by JulieAnne on Wednesday, January 5, 2011 at 5:15pm. Please check my two answers I was sitting in a park on a bench next to another person and I moved tow times the original distance between the two of us, the force of gravity between me and the other person would be: ...
Wednesday, January 5, 2011 at 6:11pm

Stuctures of the Earth
If you measure one thing, its gives you clues about something else. Give an example. I am not seeming to understand this question. It kind of tends to relate in with theories and such that scientists have made by doing investigations which have provided them clues about other ...
Tuesday, January 4, 2011 at 8:19pm

Earth science
What two thing must scientists measure to find absoluite age of rock?
Tuesday, January 4, 2011 at 8:19pm

Structure of the Earth
What severe conditions make the rock of the asthenosphere to behave like a fluid? The pressure builds down from the lithosphere onto the asthenosphere causing it to act like a viscous fluid, or soft plastic. Is this a complete answer?
Tuesday, January 4, 2011 at 8:15pm

Structure of Earth
Differences between Lithosphere and Asthenosphere. Im contrasting the two layers. Lithosphere: -rigid -cool -contains crust and upper part of mantle -brittle -doesn't flow -divided into tectonic plates -consists of heavier oceanic basalt -consists of lighter continental ...
Tuesday, January 4, 2011 at 8:09pm

Structure of the Earth
Explain Earth's layers by comparing Earth to a familiar object such as an avocado. How are the layers similar? How are they different? I dont really get this question...All I know is that they both have different layers consisting of different mix of materials. They have ...
Tuesday, January 4, 2011 at 6:48pm

Physics
A synchronous satellite is placed in a circular orbit above Earth, at an altitude of 36 400 km. Find the centripetal acceleration of the satellite. Use significant digits and units
Tuesday, January 4, 2011 at 3:13pm

space
what is the difference between the atmosphere on earth and venus
Monday, January 3, 2011 at 10:34pm

physics
Two small spaceships, each with mass m = 2000 kg, are in the circular Earth orbit of the figure, at an altitude h of 420 km. Igor, the commander of one of the ships, arrives at any fixed point in the orbit 90.0 s ahead of Picard, the commander of the other ship. At point P , ...
Monday, January 3, 2011 at 7:57pm

physics
Two Earth satellites, A and B, each of mass m, are to be launched into circular orbits about Earth's center. Satellite A is to orbit at an altitude of 7460 km. Satellite B is to orbit at an altitude of 20500 km. The radius of Earth REis 6370 km. (a) What is the ratio of ...
Monday, January 3, 2011 at 7:55pm

physical science
16. When a bullet is fired from a rifle: mine is D A. the recoiling rifle and the bullet have the same kinetic energy and momentum B. the bullet has greater momentum and kinetic energy than the rifle C. the rifle has greater momentum and kinetic energy than the bullet D. they ...
Monday, January 3, 2011 at 6:43pm

earth science
What are the different types of seafloor sediments, and what are the factors that control the distribution of each major sea sediment type? Where does each major seafloor sediment type tend to accumulate in greatest quantity (i.e., discuss the distribution of these sediments)?
Monday, January 3, 2011 at 5:06pm

Physics
A hard ball dropped from a height of 1 m in earth’s gravitational field bounces to a height of 95 cm. What will be the total distance traversed by the ball?
Monday, January 3, 2011 at 1:12am

Physical Science
I have a really good grade in this class and I need to keep it that way. I am only asking to have my answers checked. I would like to graduate with honors so please help if you can. 1. A car traveling along the highway needs a certain amount of force exerted on it to stop. ...
Sunday, January 2, 2011 at 10:03pm

ap physics c
Hi! I am struggling with this problem-- any help would be much appreciated-- thank you astronauts on their way to the moon reach a point --> at this point, the moon's gravitational pull becomes stronger than the earth's gravitational pull-----find the distance ...
Sunday, January 2, 2011 at 9:54pm

physics
What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 208 km above Earth's surface? (b) What is the period of revolution? I got a to be 7786 m/s^2 but im not sure how to get b.
Sunday, January 2, 2011 at 7:39pm

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?
Sunday, January 2, 2011 at 12:00am

physical science
when an astronaut orbits the earth, and is falling in a circle around the Earth, is he/it creating a CENTRIFUGAL force or a CENTRIPETAL force?
Friday, December 31, 2010 at 10:48pm

Science
1. Describe how the magma is generated for volcanoes parallel to a subduction zone. 2. What two factors result in a volcano at a plate boundary? 3. Why are volcanoes found at mid-ocean ridges but not at ocean trenches? 4. What causes a hot spot in the mantle? 5. Explain why ...
Friday, December 31, 2010 at 6:36pm

Science
1. Describe the landscape of the ocean floor. 2. (a) What is the Mid-Atlantic Ridge? (b) What is the relationship between an ocean ridge and an ocean trench? 3. What new technologies allowed scientists to confirm that the sea floors are spreading? 4. Hess hypothesized that new...
Friday, December 31, 2010 at 6:21pm

Physical Science 2
The attraction or pull of a person's body toward the earth, by the earth is called weight. The reaction to this force is the: My answer is B A. earth's surface pushing against the person's body B. person's body pulling on the earth C. person's body pushing ...
Friday, December 31, 2010 at 3:19pm

Physical Science
A 75 kg astronaut in space pushes against a 200 kg anvil. When the astronaut lets go of the anvil while pushing it: My answer is D (Just checking my work) A. both astronaut and anvil accelerate in opposite directions at the same rate B. neither the astronaut nor the anvil will...
Friday, December 31, 2010 at 3:10pm

physical science
which of newton's laws (1, 2, or 3)are used in the following: 1) spaceship reaches the speed for orbit around the earth, 2) pushing the shuttle forward in space 3) the force needed to escape earth's atmosphere
Friday, December 31, 2010 at 2:30pm

environmental science
The earth's differentiation and size were significant factors for life on Earth because Earth's composition and gravitational attraction
Tuesday, December 28, 2010 at 6:53pm

PHYSICS
does the sun exert a gravitational force on the earth? if so, why doesn't the earth fall into the sun?
Wednesday, December 22, 2010 at 7:31pm

PHYSICS
assume you have a mass of 100 kg on earth. on the moon, where the gravitation of the moon is 1/6 gravitation of the earth, what is your mass on the moon and what is your weight on the moon
Wednesday, December 22, 2010 at 7:30pm

earth
the blank is located between the island? what is in the blank?
Tuesday, December 21, 2010 at 7:08pm

Physics
The period of revolution of a satellite is 90min. What is the altitude above the surface of the earth?
Monday, December 20, 2010 at 9:22pm

physics
In designing rotating space stations to provide for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the negative effects of motion sickness begin to appear when the rotational motion is faster than ...
Sunday, December 19, 2010 at 10:35pm

physics
A satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). The period of the satellite is 1.30 104 s. What is the speed at which the satellite travels?
Sunday, December 19, 2010 at 10:34pm

physics
a satellite orbits the earth at an altitude of 5000 m above the surface of the earth. Assuming that acceleration due to gravity is still 9.8 m/s/s, find the time for 1 revolution.
Sunday, December 19, 2010 at 8:33pm

physics
A 70 kg man weighs 686 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 14% of his body weight? i dont even know where to start with this question... i need help!
Sunday, December 19, 2010 at 6:28pm

physics
Calculate the force of gravity on a spacecraft 19200 km (3 earth radii) above the Earth's surface if its mass is 1000 kg. what equation would i use
Sunday, December 19, 2010 at 1:28pm

physics
A 70 kg man weighs 686 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 14% of his body weight?
Sunday, December 19, 2010 at 1:20pm

physics
A 3.61 kg ball is dropped from the roof of a building 152.5 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 11.6 N on the ball. How long does it take to hit the ground? The acceleration of gravity is 9.81 m/s^2
Friday, December 17, 2010 at 8:28pm

Physics
A 3.79 kg ball is dropped from the roof of a building 163.8 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 11.5 N on the ball. It takes 5.77 second to hit the ground. How far from the building does the ball hit the ground? Answer in ...
Friday, December 17, 2010 at 7:12pm

Physics
A 3.79 kg ball is dropped from the roof of a building 163.8 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 11.5 N on the ball. How long does it take to hit the ground? The acceleration of gravity is 9.81 m/s2 . Answer in units of s.
Friday, December 17, 2010 at 7:23am

high school
The earth exerts a force of 1400 N on an orbiting communications satellite that is 35 mi above the Earth. What is the magnitude of the force the satellite will exert on the earth? Answer in units of N.
Thursday, December 16, 2010 at 8:46pm

11th grade
Calculate the minimum change in velocity (delta V or ∆V) required for the Space Shuttle to decrease its altitude to 60 miles if it’s orbiting with an apogee of 236 miles and a perigee of 215 miles above the surface of Earth. Use the rule of thumb that below an ...
Thursday, December 16, 2010 at 12:03pm

physics
A hard ball dropped from a height of 1 m in earth’s gravitational field bounces to a height of 95 cm. What will be the total distance traversed by the ball?
Thursday, December 16, 2010 at 8:40am

social studies
In 1973, Congress enacted the endagered species Act (ESA) to protect plants and animals from extinction. Many methods are used for protection. Residential or commercial developments may be banned in an area that is set aside to protect animal or plant life. People may ...
Wednesday, December 15, 2010 at 10:33pm

Science
Which of earth's layers contains the most mass?
Wednesday, December 15, 2010 at 9:01pm

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.
Wednesday, December 15, 2010 at 6:52pm

American History
Hello I just got done with a homework assignment in American History and there is this one question that has been bugging me: Which of the following is true of the columbus legend? a. He was the only voyager who believed the Earth was round. b. He was the first person ever to ...
Wednesday, December 15, 2010 at 4:05pm

Life Sciene
How would the cell theory be affected if scientists could make living cells from carbon, oxygen, and other elements found on earth.
Wednesday, December 15, 2010 at 1:50am

8th grade history
Can anyone help explain this? when the course of human events it becomes necessary for one people to dissolve the political bands which have connected them with another and to assume among the powers of earth the separte and equal stations to which the laws of nature and of ...
Tuesday, December 14, 2010 at 6:44pm

earth
On planet Tehar, the free fall acceleration is the same as that on the Earth, but there is also a strong downward electric field that is uniform close to the planets surface. A 2.00k ball having a charge of 5.00C is thrown upward at a speed of 20.1 m/s. It hits the ground ...
Tuesday, December 14, 2010 at 12:29pm

physics
A hypothetical planet has a radius 2.1 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface? What equation should i use?
Monday, December 13, 2010 at 10:33pm

physics
A coin is placed on a vinyl stereo record that is making 78 revolutions per minute on a turntable. Find the magnitude of the acceleration when the coin is placed 5.0, 10, and 17 cm from the center of the record. The radius of Earth is about 6.38x10^3 km. A 7.40x10^3 N ...
Monday, December 13, 2010 at 4:15pm

physics
The radius of Earth is about 6.38 103 km. A 7.40 103 N spacecraft travels away from Earth. What is the weight of the spacecraft at the following distances from Earth's surface?
Monday, December 13, 2010 at 4:05pm

physics
I need help with an equation for: Find the force of attraction between a bowling ball of mass 7.26 kg and the earth if the bowling ball was located at sea level. How does this compare to the weight of the bowling ball as calculated by Fg = mg? Thank you
Sunday, December 12, 2010 at 7:25pm

biology
the unique properties of water make life possible on earth, select three properties of water and: a) for each propery, identify and define the property and explain it in terms of the physical/chemical nature of water b) for each property,describe one example of how the ...
Sunday, December 12, 2010 at 7:15pm

English
I forgot to include the following questions. Thank you. 1) Anne Boleyn was executed and Henry VII married another four times. Elizabeth I restored the country to Protestantism. 2) She was often portrayed holding a rainbow, bearing the olive branch of peace, with her hand laid...
Sunday, December 12, 2010 at 6:47pm

physics
A 581 kg satellite is in a circular orbit about the Earth at a height above the Earth equal to the Earth's mean radius. the orbital speed is 5590.98 m/s. Find the period of its revolution.
Sunday, December 12, 2010 at 1:57pm

science
The average solar radiation incident on the surface of the earth is about 1 KW/m2 for the entire year. A solar house is built with solar panels installed in the roof to provide the heating and electrical energy of the house. If the roof has a surface area of 100 m2 and the ...
Sunday, December 12, 2010 at 11:34am

physics
why is earth bulged at the equator?will any one explain me about this?
Sunday, December 12, 2010 at 7:07am

Earth
What layers of the Earth are the continents sliding on?
Saturday, December 11, 2010 at 9:42pm

Earth
Where is Greenland on Pangaea?
Saturday, December 11, 2010 at 8:29pm

physics
I need help finding an equation for: an asteroid revolves around the sun with a mean orbital radius twice that of Earth's. Predict the period of the asteroid in Earth years. Thank you.
Thursday, December 9, 2010 at 10:37pm

Physics
What is the amount of CO2 added to the earth's atmosphere each year from fossil fuels?
Thursday, December 9, 2010 at 10:22pm

Science
1. Molten rock from the mantle flows out of active ___________. 2. This type of crust is generally 5-8 KM thick. _____________. 3. The inner and outer cores make up this layer of the earth. ______________. 4. The lightest materials make up the outermost layer, and the densest ...
Thursday, December 9, 2010 at 8:11pm

Physics
A satellite has a mass of 101 kg and is located at 1.99x10^6 m above Earth's surface. (a) What is the potential energy of the satellite at this location? (b) What is the magnitude of the gravitational force on the satellite? for potential energy, I was using the equation ...
Thursday, December 9, 2010 at 7:34pm

12th grade
Objects on the moon's surface have an acceleration due to gravity one-sixth that on the earth's. What would the 40 kg boy weigh on the moon? (Round answer to nearest tenth.)
Thursday, December 9, 2010 at 10:38am

physics
A satellite moves in a circular orbit around the Earth at a speed of 5661 m/s. (b) Determine the period of the satellite's orbit. the satilites altitude above the surface of earth is 6076312.71m. im using the equation P=2*pi*r/v and am coming up with 1.87 and its not right...
Wednesday, December 8, 2010 at 11:47pm

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
Wednesday, December 8, 2010 at 9:58pm

physics...
A satellite moves in a circular orbit around the Earth at a speed of 5661 m/s. (a) Determine the satellite's altitude above the surface of the Earth. i'm using the equation Gm/(r+h)=9.8 where h=altitude and i keep coming up with the wrong answer.
Wednesday, December 8, 2010 at 3:20pm

Earth's Heat Resources
most of earth's landmass is in the northern hemisphere. how might this influence Earth's overall albedo during a)June b)January I really dont get this question.
Wednesday, December 8, 2010 at 10:22am

Earth's Heat Resources
How is the energy that reaches earth's surface returned to space? is is by radiation?
Wednesday, December 8, 2010 at 10:22am

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 dont get what kinds of activities its referring to.
Wednesday, December 8, 2010 at 10:22am

biology
What regulary hit the earth for the first 600 million years of existence? What do scientists call this period of time? - Aseroids, and meteors hit the earth.What do scientists called this period of time ? I need help answer this question please. If the first question is right ?
Wednesday, December 8, 2010 at 8:36am

Earth's Heat Sources
most of earth's landmass is in the northern hemisphere. how might this influence Earth's overall albedo during a)June b)January I really dont get this question.
Tuesday, December 7, 2010 at 9:37pm

Earth's Heat Resources
How is the energy that reaches earth's surface returned to space? is is by radiation?
Tuesday, December 7, 2010 at 9:25pm

physics
Two stones of different masses are thrown straight upward one on earth and on the moon (where gravity produces an acceleration of 1.67m/second squared) Both reach the same height. if the stone on the moon has an initial speed v, what was the initial speed of the stone on earth...
Tuesday, December 7, 2010 at 8:46pm

English
a living thing which grows in earth: plant (What does "in earth" mean? Does it mean under the ground or on the ground?)
Tuesday, December 7, 2010 at 4:44pm

earth
What does the word anti mean? My answer- is opposed to something????? Please help me
Monday, December 6, 2010 at 10:21pm

earth
Compare the patterns of earthquakes, colcanoes and mountain ranges on Earth.
Monday, December 6, 2010 at 8:28pm

science
where does horizontal sliding take place on the earth?
Monday, December 6, 2010 at 6:38pm

Physics Help please
The free-fall acceleration on Mars is 3.7 m/s2. (a) What length pendulum has a period of 4 s on the earth? cm What length pendulum would have a 4 s period on Mars? cm (b) A mass is suspended from a spring with force constant 10 N/m. Find the mass suspended from this spring ...
Monday, December 6, 2010 at 10:31am

math
If I am 11 years old on Earth,how old will I be in Mercury?
Monday, December 6, 2010 at 7:51am

Physics
The free-fall acceleration on Mars is 3.7 m/s2. (a) What length pendulum has a period of 4 s on the earth? cm What length pendulum would have a 4 s period on Mars? cm (b) A mass is suspended from a spring with force constant 10 N/m. Find the mass suspended from this spring ...
Sunday, December 5, 2010 at 3:40pm

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?
Sunday, December 5, 2010 at 1:51pm

physics
A treasure map you uncovered while vacationing on the Spanish Coast reads as follows: "If me treasure ye wants, me hoard ye'll have, just follow thee directions these. Step to the south from Brisbain's Mouth, 6 paces through the trees. Then to the west, 10 paces ...
Sunday, December 5, 2010 at 1:50pm

science
how far did the chile miners enter into the earth
Saturday, December 4, 2010 at 10:44pm

science
how does the miners jobs help the earth
Saturday, December 4, 2010 at 10:41pm

science
how did the miners of chile get into the earth
Saturday, December 4, 2010 at 10:36pm

science
what layer of the earth did the chile miners reach
Saturday, December 4, 2010 at 10:34pm

earth
the earth has a limited amount of water true or false
Saturday, December 4, 2010 at 8:04pm

physics
Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and We = 1.157 x 10-5 rev/sec.
Saturday, December 4, 2010 at 6:15pm

physics
Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and ùE = 1.157 x 10-5 rev/sec.
Saturday, December 4, 2010 at 4:21pm

physics
Find the rotational kinetic energy of the earth about the sun due to its orbit about the sun. The mass of the earth M is 6 x 1024 kg, the orbital radius r is 1.5 x 1011 m and the rotational period T is 1 year. Treat the earth as a point mass in this problem
Saturday, December 4, 2010 at 8:48am

Physics - mass of a galaxy
A star at the edge of the Andromeda galaxy appears to be orbiting the center of that galaxy at the speed of about 200km/s. The star is about g*10^9AU from the center of the galaxy. Calculate a rough estimate of the mass of the Andromeda galaxy. Earth orbital radius is 1.40*10^8
Saturday, December 4, 2010 at 5:16am

earth
A cold front traveling at an average speed of 35 km/h eastward is 280 km due west of you. Appoximately how long will it be before your location experiences a sudden temperature drop?
Friday, December 3, 2010 at 3:52pm

Science
how could measuring the orbit of a comet help scientist understand when it will next be visible from earth
Thursday, December 2, 2010 at 11:39pm

Physics
The intensity of an earthquake wave passing through the Earth is measured to be 2.5×106 J/m^2 at a distance of 48 km from the source. What was its intensity when it passed a point only 2.0 km from the source? At what rate did energy pass through an area of 3.0 m^2 at 2.0...
Thursday, December 2, 2010 at 10:07pm

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