Saturday
May 25, 2013

# Homework Help: Science: Earth

science
At which elevation would you be above one half of the mass of Earth's atmosphere?
Sunday, April 10, 2011 at 9:31pm

physics ---- really dnt get this at all
if friction is set to zero and on planet Earth. Now, if you attach a mass to the spring from its initial equilibrium position, it vibrates forever in simple harmonic motion. Why doesn't it come to rest after stretching by a distance 'd'; proportional to the weight ...
Sunday, April 10, 2011 at 8:00pm

I'm trying to find the gravitational force of an electron at earth's surface. I know I say Fg = mass electron * gravity Gravity in this case is 6.673*10-11 m^2/kg^2 correct, not 8.93 * 10^-30N that we used for force of acceleration, right. I use the universal constant ...
Sunday, April 10, 2011 at 6:24pm

english
Except for a few pigeons, Central Park was deserted. Mist hung above the chilled grass. Patches of old snow, scattered here and there, looked like white puddles. The sun hung just above the horizon, casting red and orange streaks across low-hanging clouds. The portly, gray-...
Sunday, April 10, 2011 at 2:18am

physics
An accelerating voltage of 2.46 * 10^3 V is applied to an electron gun, producing a beam of electrons originally traveling horizontally north in vacuum toward the center of a viewing screen 34.0 cm away. What is the magnitude of the deflection on the screen caused by the ...
Saturday, April 9, 2011 at 11:05am

Physics Urgent!!!!!
Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on ...
Friday, April 8, 2011 at 2:26pm

physics
An accelerating voltage of 2.46 * 10^3 V is applied to an electron gun, producing a beam of electrons originally traveling horizontally north in vacuum toward the center of a viewing screen 34.0 cm away. What is the magnitude of the deflection on the screen caused by the Earth...
Friday, April 8, 2011 at 12:45pm

physics
An accelerating voltage of 2.46 * 10^3 V is applied to an electron gun, producing a beam of electrons originally traveling horizontally north in vacuum toward the center of a viewing screen 34.0 cm away. What is the magnitude of the deflection on the screen caused by the Earth...
Friday, April 8, 2011 at 10:52am

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on a...
Friday, April 8, 2011 at 12:24am

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on a...
Thursday, April 7, 2011 at 10:55pm

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on a...
Thursday, April 7, 2011 at 9:26pm

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on ...
Thursday, April 7, 2011 at 7:59pm

Physics Urgent!!
A day on Mars is 24.6 Earth hours long. A year on Mars is 687 Earth days long. How do the angular velocities of Mars’ rotation and orbit compare to the angular velocities of Earth’s rotation and orbit? w(M)/w(E)= and w(My)/w(Ey)= w is what I used to represent omega...
Thursday, April 7, 2011 at 7:00pm

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on a...
Thursday, April 7, 2011 at 6:39pm

I don't want someone to do this for me-I'm just totally lost and don't even know where to start-I'm totally lost on this one- the earth is surrounded by an electric field with a strenth of 100 N/C at the surface. Its electric properties are the same as a point ...
Thursday, April 7, 2011 at 3:31pm

Physics-Totally lost
I'm totally lost on this one- the earth is surrounded by an electric field with a strenth of 100 N/C at the surface. Its electric properties are the same as a point charge located at its center. How would the gravatational force and electrical force compare foor an ...
Thursday, April 7, 2011 at 11:03am

Earth Science
Compare the general temperature and direction of flow of the current that flows off the east coast of the United States with the temperature and direction of flow of the current that flows off the west coast of the United States.
Thursday, April 7, 2011 at 10:27am

Physics
The Hubble Space Telescope orbits the Earth at an approximate altitude of 612 km. Its mass is 11,100 kg and the mass of the Earth is 5.97×1024 kg. The Earth's average radius is 6.38×106 m. What is the magnitude of the gravitational force that the Earth exerts ...
Wednesday, April 6, 2011 at 9:32pm

Physics
The Hubble Space Telescope orbits the Earth at an approximate altitude of 612 km. Its mass is 11,100 kg and the mass of the Earth is 5.97×1024 kg. The Earth's average radius is 6.38×106 m. What is the magnitude of the gravitational force that the Earth exerts ...
Wednesday, April 6, 2011 at 9:29pm

Physical Geography, Earth Science
Who were the four other major contributors to the development of modern astronomy after Copernicus? Explain what those contributions were. Finally, why did it take so long for the geocentric view of the universe to be overthrown and what does that tell us about scientific ...
Wednesday, April 6, 2011 at 9:15pm

earth
If the ray is traveling 5800 miles per hour from earth how long would it take to hit the moon?
Wednesday, April 6, 2011 at 11:05am

physics
n object is dropped from rest from a height 5.8 × 106 m above the surface of the earth. If there is no air resistance, what is its speed when it strikes the earth? The acceleration of gravity is 9.81 m/s2 and the radius of the Earth is 6.37 × 106 m. Answer in units...
Tuesday, April 5, 2011 at 11:19pm

physics
An accelerating voltage of 2.46 * 10^3 V is applied to an electron gun, producing a beam of electrons originally traveling horizontally north in vacuum toward the center of a viewing screen 34.0 cm away. What is the magnitude of the deflection on the screen caused by the Earth...
Tuesday, April 5, 2011 at 10:19pm

Physics
In the rough approximation that the density of the Earth is uniform throughout its interior, the gravitational field strength (force per unit mass) inside the Earth at a distance r from the center is gr/R, where R is the radius of the Earth. (In actual fact, the outer layers ...
Tuesday, April 5, 2011 at 6:11pm

physics
The highest natural atmospheric temperature ever recorded on Earth was 58°C (136°F), at El Azizia, Libya on September 13, 1922. The record low temperature was −89°C (−129°F), which occurred at the Soviet Vostok Station in Antarctica on July 21, 1983...
Tuesday, April 5, 2011 at 4:23pm

Physical Geography, Earth Science
How do you label a Tectonic Map of Hypothetical Ocean Basin? I have to draw in the plate boundaries.
Tuesday, April 5, 2011 at 2:46pm

math
An object's weight on the Moon is less than its weight on Earth. This is because the Moon exerts less gravitational force on an object than Earth does. The equation m = can be used to find an object¿s weight on the moon, where m is the object¿s weight on the ...
Tuesday, April 5, 2011 at 9:37am

Math
An ant weighs about 2 x 10^-5 lb. There are about10^15 ants on earth. How many pounds of an ants are on earth?
Monday, April 4, 2011 at 9:05pm

mechanics
at what altitude above the earth's surface is the free fall acceleration equal to three quarters of its value at the surface ?
Sunday, April 3, 2011 at 1:53am

science
your mass is 90 kilograms. you are on the earth where the acceleration of gravity is measured at 9.8 meters/sec sec. What is your weight in Newton?
Saturday, April 2, 2011 at 5:50pm

SCI 275
. Final Project: Mitigation Strategies and Solutions • Resource: Appendix A • Use the topic you chose for the Capstone Discussion Question or choose another topic you have learned about over the past 8 weeks. • Focus on a specific environmental problem in your ...
Saturday, April 2, 2011 at 4:43pm

Earth Science
Compare the general temperature and direction of flow of the current that flows off the east coast of the United States with the temperature and direction of flow of the current that flows off the west coast of the United States.
Saturday, April 2, 2011 at 4:01pm

physics
As you walked on the moon, the earth’s gravity would still pull on you weakly and you would still have an earth weight. How large would that earth weight be, compared to your earth weight on the earth’s surface? (Note: The earth’s radius is 6378 km and the ...
Thursday, March 31, 2011 at 10:44pm

UOP
HOW HAS HUMANS AFFECTED THE ANTARCTIC FOOD WEB I am a tax preparer and got swamped, now My paper is so late. Help, this is case we have to analyze. 700-to-900 word analysis of the case at bottom and these questions in the analysis: o Identify any unintended consequences of ...
Wednesday, March 30, 2011 at 11:23pm

Earth Science
Compare the general temperature and direction of flow of the current that flows off the east coast of the United States with the temperature and direction of flow of the current that flows off the west coast of the United States.
Wednesday, March 30, 2011 at 2:28pm

Science question
How do oceans redistribute energy around the earth? Isn't this due to evaporation? Or.. the Coriolos effect? Could someone help me? Thanks -Allyson
Tuesday, March 29, 2011 at 3:24pm

Physics
A satellite with an orbital period of exactly 24.0 h is always positioned over the same spot on Earth. This is known as a geosynchronous orbit. Television, communication, and weather satellites use geosynchronous orbits. At what distance would a satellite have to orbit Earth ...
Tuesday, March 29, 2011 at 9:27am

Science
Compare an astronauts weight in orbit with the astronauts weight on Earth, assuming the mass of the astronaut doesn't change.
Monday, March 28, 2011 at 8:13pm

physics (3 seperate questions)
1. A small fly of mass 0.26 g is caught in a spider's web. The web vibrates predominately with a frequency of 4.2 Hz. Find the effective spring stiffness constant k for the web. Hint: use natural frequency of oscillations formula. N/m 2. At what frequency would you expect ...
Monday, March 28, 2011 at 8:01pm

Science
Compare an astronauts weight in orbit with the astronauts weight on Earth, assuming the mass of the astronaut doesn't change.
Monday, March 28, 2011 at 7:15pm

Science
Explain- how would the gravitational force between Earth and the Moon change if the distance between them increased?
Monday, March 28, 2011 at 6:36pm

Jenny - earth-geology
I removed your original post because you included your full name and your town. That's too much personal information for a public forum. Here's your question: Hey there, can anyone help with this question:-Mineral amphibole is composed of double chains of SiO44− ...
Monday, March 28, 2011 at 2:30pm

physics
A spring scale being used to measure the weight of an object reads 12.8 N when it is used on earth. The spring stretches 4.95 cm under the load. The same object is weighed on the moon, where gravitational acceleration is 1/6g. Find the reading of the spring scale on the moon. ...
Monday, March 28, 2011 at 11:13am

earth science
what is the tectonic setting of seattle washington?
Monday, March 28, 2011 at 10:14am

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 panels if your ...
Sunday, March 27, 2011 at 10:30pm

physics
the polar-orbiting environmental satellites (POES) and some military satellites orbit at a much lower level in order to obtain more detailed information. POES complete an Earth orbit 14.1 times per day. What are the orbital speed and the altitude of POES?
Sunday, March 27, 2011 at 8:02pm

physics
Your spacecraft is in a circular, geostationary orbit around earth and you would like to fly to the moon. Draw a suitable Hohmann transfer orbit that will get you there. How long does the journey take? (Neglect the gravitational fields of the moon and the sun for this problem...
Sunday, March 27, 2011 at 6:39pm

physics
Muons are elementary particles that have a very short lifetime of about two millionth of a second (when at rest). They can be created in the upper atmosphere (at an altitude of say 10,000 meters) by cosmic rays, in which case they travel towards the surface of the Earth at ...
Sunday, March 27, 2011 at 6:39pm

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 panels if your ...
Sunday, March 27, 2011 at 5:55pm

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 the launch to the...
Sunday, March 27, 2011 at 5:01am

mechanics
A 5 Kg marble is fired vertically upward using a spring gun. The spring must be compressed 8.0cm if the marble is to just reach a target 20m above the marble’s position on the compressed spring. a) What is the change ∆U in the gravitational potential energy of the ...
Sunday, March 27, 2011 at 4:56am

physic
How long will a radio wave, with a wave length of 200 m takes to travel to and for the moon from the earth? (Distance of moon from earth = 3.9 x 108 m)
Sunday, March 27, 2011 at 3:48am

english, Writing in the Vernacular: Burns
I just want to get a better understanding of this. I need help badly. 1. What mood does the dialect in “To a Mouse” and “To a Louse” by Robert Burns convey? a. longing and evocative b. proud and provocative c. cheerful and down-to-earth 2. Using context ...
Saturday, March 26, 2011 at 8:57pm

Earth Science
As a star ages, its internal composition changes as nuclear reactions in the star's core convert one element into another. True or false?
Friday, March 25, 2011 at 9:39pm

earth science
During an earthquake, the ground surface ____.
Friday, March 25, 2011 at 10:02am

Physics
The radius of the earth is 6.4 * 10^6 m. What is the acceleration of a meteor when it is 8.4*10^6M FROM THE CENTER OF THE EARTH?
Thursday, March 24, 2011 at 9:38pm

MATH
Can someone please help me with the following question. 1) The weight of an object above Earth can be modeled by a function of the form w(h)=(r/r+h)^2*"w , where r is the radius of Earth 0" (approximately 3950 miles)," h" is the distance above Earth's ...
Thursday, March 24, 2011 at 7:10pm

Pre-Calc (Please my class starts in an hour!! :)
Can someone please help me with the following question. 1) The weight of an object above Earth can be modeled by a function of the form w(h)=(r/r+h)^2*"w , where r is the radius of Earth 0" (approximately 3950 miles)," h" is the distance above Earth's ...
Thursday, March 24, 2011 at 5:37pm

Pre-Calc H.W. Help :)
Can someone please help me with the following question. 1) The weight of an object above Earth can be modeled by a function of the form w(h)=(r/r+h)^2*"w , where r is the radius of Earth 0" (approximately 3950 miles)," h" is the distance above Earth's ...
Thursday, March 24, 2011 at 5:22pm

Physics
Find the net force of gravity on the moon (Mm = 7.35 x 10^22 kg) from the earth and the sun (Ms = 1.99 x 10^30). Assume that the two forces are perpendicular to each other. Give the angle in relationship to the sun.
Thursday, March 24, 2011 at 5:00pm

science
what would happen to day and night if the Earth rotated faster?
Thursday, March 24, 2011 at 4:40pm

Pre-Calculus
Can someone please help me with the following question. 1) The weight of an object above Earth can be modeled by a function of the form w(h)=(r/r+h)^2*"w , where r is the radius of Earth 0" (approximately 3950 miles)," h" is the distance above Earth's ...
Thursday, March 24, 2011 at 4:37pm

English
I am the WORST writer. English is my weakness. I just wrote this literary analysis. I would go to the writing center at my school, but the paper is due tomorrow and it doesn't open until after my class. I would appreciate it SO much is someone could just quickly scan this ...
Thursday, March 24, 2011 at 12:00am

physics-telescope
The Hubble Space Telescope (HST) can resolve objects that have a small angular separation because there is no atmospheric distortion of the light. (i.e. The HST has excellent resolving power.) Its 2.4-m-diameter primary mirror can collect light from distant galaxies that ...
Wednesday, March 23, 2011 at 11:22pm

physics
at what altitude should a satellite be placed into circular orbit so that its orbital period is 48 hours? the mass of the earth is 5.976x10^24 kg and the radius of the eatrh is 6.378x10^6 m.
Wednesday, March 23, 2011 at 11:14pm

science
as a satellite goes round the earth the earth turns on its axis. some satellities are always above the same place on the earths surface. how many hours do these satellities take to complete one orbit.
Wednesday, March 23, 2011 at 1:54pm

Calculus
A wizard with a long beard and bright, flaming eyes places a table in front of you. On the table are two circular rings resembling frisbees. The wizard motions to the table. "We call them Galadriel rings after the great elf of Middle Earth, and we use the rings to test ...
Wednesday, March 23, 2011 at 10:35am

physics
A force of 80.0 N is required to pull a 25.0 kg wooden toy boat at a constant velocity across a smooth glass surface on Earth. What force would be required to pull the same wooden toy boat across the same glass surface on the planet Jupiter?
Wednesday, March 23, 2011 at 12:07am

science
would a screen be useful for separating a mixture of gravel and diatomaceous-earth powder?
Tuesday, March 22, 2011 at 10:53pm

Physics
(a) Determine the amount of work (in joules) that must be done on a 95 kg payload to elevate it to a height of 1007 km above the Earth's surface. ANSWER in MJ (b) Determine the amount of additional work that is required to put the payload into circular orbit at this ...
Tuesday, March 22, 2011 at 6:44pm

earth
How many minutes does it take for light from the sun to reach the earth?
Tuesday, March 22, 2011 at 1:27pm

Physics
An 95.0 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 26.3 m behind the ship, at rest relative to the spaceship. The only way to return to ...
Monday, March 21, 2011 at 10:12pm

Physics
A 2.40 m length of wire is held in an east-west direction and moves horizontally to the north with a speed of 15.1 m/s. The vertical component of Earth's magnetic field in this region is 40.0 µT directed downward. Calculate the induced emf between the ends of the ...
Monday, March 21, 2011 at 6:40pm

Physics
(a) Determine the amount of work (in joules) that must be done on a 95 kg payload to elevate it to a height of 1007 km above the Earth's surface. 1 ? MJ (b) Determine the amount of additional work that is required to put the payload into circular orbit at this elevation. 2...
Monday, March 21, 2011 at 3:26pm

Physics
(a) Determine the amount of work (in joules) that must be done on a 95 kg payload to elevate it to a height of 1007 km above the Earth's surface. 1 ? MJ (b) Determine the amount of additional work that is required to put the payload into circular orbit at this elevation. 2...
Monday, March 21, 2011 at 3:26pm

physics
Muons are elementary particles that have a very short lifetime of about two millionth of a second (when at rest). They can be created in the upper atmosphere (at an altitude of say 10,000 meters) by cosmic rays, in which case they travel towards the surface of the Earth at ...
Sunday, March 20, 2011 at 10:20pm

physics
Your spacecraft is in a circular, geostationary orbit around earth and you would like to fly to the moon. Draw a suitable Hohmann transfer orbit that will get you there. How long does the journey take? (Neglect the gravitational fields of the moon and the sun for this problem...
Sunday, March 20, 2011 at 10:19pm

physics
magine a straight line connecting the centers of the earth and the moon. At some point along this line the gravitational forces pulling a spacecraft towards the moon and towards the earth exactly balance each other, and the craft could just sit there in (an unstable) ...
Sunday, March 20, 2011 at 10:19pm

physics
a satellite is in a circular orbit at a constant velocity around the earth. how much work is done on the satellite?
Saturday, March 19, 2011 at 9:52pm

Physics
Compute the angular momentum of the earth arising from the following motions. (a) Earth's orbital motion around the sun. (b) Earth's rotation on its axis. Can someone please help me with this question? Thanks
Friday, March 18, 2011 at 6:46pm

Physics
The center of a 1.50 diameter spherical pocket of oil is 1.20 beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 800 kg/m^3. Solve for delta g/ ...
Friday, March 18, 2011 at 1:54pm

physics
How high above the earth’s surface would you have to be before your weight would be only 0.6 its current value?
Friday, March 18, 2011 at 12:30am

geometry
a globe of the earth measures 12 inches in a diameter. calculate the surface area and volume of this globe
Thursday, March 17, 2011 at 10:23pm

physics
work is being done when a force: a) is exerted while pulling a wagon up a hill b) acts vertically on a cart that can only move horizontally c) is exerted by one team in a tug-of-war when there is no movement d) of gravitational attraction acts on a person standing on the ...
Thursday, March 17, 2011 at 7:45pm

Physics
What would be the orbital speed and period of a satellite in orbit 0.88 multiplied by 108 m above the Earth? Orbital Speed___m/s Period___s Thanks!
Thursday, March 17, 2011 at 6:37pm

Physics
The center of a 1.50 diameter spherical pocket of oil is 1.20 beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 800 kg/m^3. Solve for delta g/ ...
Thursday, March 17, 2011 at 6:27pm

physics
Suppose partial melting of the polar ice caps increases the moment of inertia of the Earth from 0.331MR^2 to 0.332MR^2. What is the change in length of day in seconds?
Thursday, March 17, 2011 at 6:06pm

physics
The Earth exerts an 680 N gravitational force on a man. What force does the man exert on the Earth? Answer in units of N
Wednesday, March 16, 2011 at 6:15pm

Science
If we can't dig to the center of the earth, how do we know that is down there?
Wednesday, March 16, 2011 at 4:28pm

physics
A satellite circling the earth has an average power consumption of 370.0 W. Assuming 5.4% efficiency for conversion of solar energy to electrical energy, what area is required for the solar panels?
Wednesday, March 16, 2011 at 2:29am

science
what kind of heat transfer causes earth's major wind patterns
Tuesday, March 15, 2011 at 10:42pm

physics
Engineers are trying to create artificial "gravity" in a ringshaped space station by spinning it like a centrifuge. The ring is 120 m in radius. How quickly must the space station turn in order to give the astronauts inside it apparent weights equal to their real ...
Tuesday, March 15, 2011 at 3:18pm

World History
007679 1. A staple food transplanted from Southeast Asia to the Mediterranean world as a result of the Islamic Empire was A. wheat. B. rice. C. yams. D. potatoes. 2. How did Alfred the Great secure his modern reputation as a state-builder? A. He gave free land and tax breaks ...
Tuesday, March 15, 2011 at 11:30am

Physical Science
If a vehicle circled Earth at a distance equal to the Earth-Moon distance, how long would it take to make a complete orbit?
Tuesday, March 15, 2011 at 9:38am

Physics
What must be the orbital speed of a satellite in a circular orbit 740 km above the surface of the earth?
Monday, March 14, 2011 at 11:31pm

earth science
how does the apparent diameter of the sun from earth affect the orbital velocity?
Monday, March 14, 2011 at 9:42pm

Socials
Confederation: For and against.. In a chart, list Joseph Hows's points against Confederation in one column, and Macdonald's points in favour of Confederation in another. This is what Joseph Howe said: Let us see what the Canadians desiere to do. They are not, as have ...
Monday, March 14, 2011 at 9:27pm

Physics
a) A distant spaceship carrying a red headlight, emitting light with wavelength 600 nm, is heading towards the earth. Observers on the earth detect the light from the headlight as ultraviolet light with wavelength 200 nm. What is the velocity of the spaceship? b) After the ...
Sunday, March 13, 2011 at 6:59pm

Science - Physical
Earth's magnetic field induces some degree of magnetism in most of the iron objects around you. With a compass you can see that cans of food on you pantry shelf have north and south poles. When you pass the compass from their bottoms to their tops, you can easily identify ...
Sunday, March 13, 2011 at 12:27pm

physics
Suppose a cylindrical habitat in space 7.70 km in diameter and 25.0 km long has been proposed. Such a habitat would have cities, land, and lakes on the inside surface and air and clouds in the center. They would all be held in place by rotation of the cylinder about its long ...
Friday, March 11, 2011 at 11:05pm

physics
A 981-kg satellite orbits the Earth at a constant altitude of 103-km. How much energy must be added to the system to move the satellite into a circular orbit with altitude 199 km? I need answer in MJ please tell me what formula
Friday, March 11, 2011 at 8:41pm

English
I need to find the thesis and main points of his argument. President John F. Kennedy’s Inaugural Address. January 20, 1961. Text is in the public domain. Vice President Johnson, Mr. Speaker, Mr. Chief Justice, President Eisenhower, Vice President Nixon, President Truman, ...
Friday, March 11, 2011 at 7:01pm

Physics
Some spacecraft design uses a solar sail made of aluminized plastic. As sunlight reflects off the sail, radiation pressure drives the spacecraft outward away from the sun. a. If the sail material has a density of 700.0 kg/m3, what is the maximum thickness of the sail for which...
Friday, March 11, 2011 at 3:03pm

physics
What is the minimum speed, relative to the Sun, necessary for a spacecraft to escape the solar system if it starts at the Earth's orbit? Please tell me what formula
Friday, March 11, 2011 at 12:44pm

PHYSICS
At the Earth's surface, a projectile is launched straight up at a speed of 8.4 km/s. To what height will it rise? Ignore air resistance and the rotation of the Earth.
Friday, March 11, 2011 at 11:44am

Physics
Some spacecraft design uses a solar sail made of aluminized plastic. As sunlight reflects off the sail, radiation pressure drives the spacecraft outward away from the sun. a. If the sail material has a density of 600.0 kg/m3, what is the maximum thickness of the sail for which...
Thursday, March 10, 2011 at 7:29pm

Physics
(a) Find the speed of a satellite moving around the earth in a circular orbit that has a radius equal to six times the earth's radius of 6.38 x 10^6 m. (b) Find the satellite's orbital period.
Thursday, March 10, 2011 at 6:48pm

physics
Assume that the earth is a uniform sphere and that its path around the sun is circular. (a) 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. (...
Thursday, March 10, 2011 at 3:19am

Science
Wednesday, March 9, 2011 at 5:49pm

Physics
In the approximation that the Earth is a sphere of uniform density, it can be shown that the gravitational force it exerts on a mass m inside the Earth at a distance r from the center is mg(r/R), where R is the radius of the Earth. (Note that at the the surface and at the ...
Wednesday, March 9, 2011 at 3:33pm

College Physics
n the approximation that the Earth is a sphere of uniform density, it can be shown that the gravitational force it exerts on a mass m inside the Earth at a distance r from the center is mg(r/R), where R is the radius of the Earth. (Note that at the the surface and at the ...
Tuesday, March 8, 2011 at 9:53pm

physics
15000N on earth 2250N on moon Moon Radius= 1.74x10^6m Orbital Height 100km Total orbit 1.84x10^6m What is orbital speed?
Tuesday, March 8, 2011 at 9:02pm

Physics
In principle, anytime someone jumps up, the earth moves in the opposite direction. To see why we are unaware of this motion, calculate the recoil speed of the earth when a 65.0 kg person jumps upward at a speed of 1.70 m/s. v=?
Tuesday, March 8, 2011 at 6:43pm

trig
A surveillance satellite circles the earth at a hight of h miles above the surface. Suppose that d is the distance, in miles, on the surface of the earth that can be observed from the satellite. find an equation that relates to central angel (theta) to the hight h.
Tuesday, March 8, 2011 at 11:23am

Derive the rocket equation M(dV/dt) = -u(dM/dt)for a rocket in the (constant) gravitational field near the surface of the Earth.
Monday, March 7, 2011 at 5:14pm

physics
1)Under ideal conditions, if 300 J of work are required tolift a mass to a certain height, the same mass should provide ___ J to do work as it falls back to Earth. Can you please comment as to whether my answer of 300 J is correct? 2)___ is conserved during an inelastic ...
Sunday, March 6, 2011 at 3:55pm

Physics-10
A vehicle that weighs 400N on the surface of the earth is traveling in outer space at a speed of 400m/s. it can be stopped by applying a constant force of 20N for?
Friday, March 4, 2011 at 12:27pm

math
Complete the following: (2 points per answer) Celestial Body Equatorial Diameter (km) Scientific Notation Earth 12,700 Moon 3.48 X 103 Sun 1,390,000 Jupiter 1.34 X 105 Mercury 4800 2. Theater ticket prices (in dollars) x years after 1997 are described by the polynomial -0....
Friday, March 4, 2011 at 8:43am

physics
An airplane is flying horizontally with a speed of 1000 km/hr (278 m/s) when it drops a payload. The payload hits the ground 37 s later. (Neglect air drag and the curvature of the Earth. Take g = 10 m/s2.) (a) At what altitude H is the airplane flying?
Friday, March 4, 2011 at 2:44am

physics
Calculate the value of g for a satellite that is orbiting in a circle at an altitude equal to 3 Earth radii. also, along the same lines, A typical shuttle altitude is 220 km. Calculate the value of g at this altitude. The the mass of the Earth = 5.98 x 10^24 kg and the radius ...
Thursday, March 3, 2011 at 9:33pm

precalculus
The earth's atmospheric pressure, P, in terms of height above sea level is often modeled by an exponential decay function. The pressure at sea level is 1013 millibars and the pressure decreases by 14% for every kilometer above sea level. (a) What is the atmospheric ...
Thursday, March 3, 2011 at 5:41pm

physics
About 50,000 years ago, in an area located outside Flagstaff, Arizona, a giant 4.5x10^7 kg meteor fell and struck Earth, leaving a 180 m hole now known as Barrington crater. If the meteor was traveling 20000 m/s upon impact, with what average force did the meteor hit Earth? ...
Thursday, March 3, 2011 at 1:03am

Physics
A satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). The period of the satellite is 2.60 104 s. What is the speed at which the satellite travels?
Wednesday, March 2, 2011 at 9:31pm

overland high school
the gravitional force exerted on objects on the moon is about 1/6 that of earth. if an object weighs 240 newtons on the moon, on earth it would weigh _________.show work
Wednesday, March 2, 2011 at 9:31pm

earth
describe the relationship between mass movement and gravity?
Wednesday, March 2, 2011 at 9:13pm

Biology
A space probe discovers a planet inhabited by creatures who reproduce with the same hereditary patterns as those in humans. Three phenotypic characters are height (T = tall, t = dwarf), hearing appendages (A = antennae, a = no antennae), and nose morphology (S = upturned snout...
Wednesday, March 2, 2011 at 9:10pm

earth science
why do cloulds and precipitation usually occur along frontal surface
Wednesday, March 2, 2011 at 6:48pm

science
the phenomena of parallelism of axis? a- results in the production of day and night b- causes different hemispheres of the earth to tilt toward the sun c- determines the angle at which the sun's rays will strike the earth d- all of the above
Wednesday, March 2, 2011 at 11:49am

Physics
Can anyone explain this to me, it was on my exam and i dont get it ; A 14.0 kg crate is pulled up a rough incline with an initial speed of 1.6 m/s. The pulling force is 131.0 N parallel to the incline, which makes an angle of 12.3 ◦ with the horizontal. The coeﬃ...
Wednesday, March 2, 2011 at 11:25am

physical science
At the bottom of a well one quarter of radius of the earth deep your weight compare to your normal weight would be
Tuesday, March 1, 2011 at 3:19pm

physical science
a 180 lb person climbs a ladder to a point which is two times the radius of the earth high. how much does he weigh there?
Tuesday, March 1, 2011 at 3:17pm

earth
Was there any magnetic pulling during the Mesozoic Era?
Monday, February 28, 2011 at 7:00pm

Physics
Typically satellites orbit around 400 above the surface of the earth. If an astronaut weighs 600 on the ground, what will he weigh if he is 400 above the surface?
Monday, February 28, 2011 at 10:39am

physics
A projectile with mass of 139 kg is launched straight up from the Earth's surface with an initial speed vi. What magnitude of vi enables the projectile to just reach a maximum height of 5.8RE, measured from the center of the Earth? Ignore air friction as the projectile ...
Monday, February 28, 2011 at 9:05am

Physics
Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 66 kg student to accelerate downward at 9.8 m/s2, determine the upward accelera- tion of the Earth during the student’s fall.
Sunday, February 27, 2011 at 10:01pm

Physics
Physics question on identify the reaction? I am having trouble with the question a, b, and c in this physics problem: One or more external forces are exerted on each object enclosed in a dashed box shown in the figure below. Identify the reaction to each of these forces. (...
Sunday, February 27, 2011 at 7:07pm

physics
free fall on the moon is 1.62m/s2 What is the lenght of the pendulum whos period on the moon mtches the period of 1.80m long on Earth?
Saturday, February 26, 2011 at 8:16pm

physics
A satellite is in orbit about Earth. Its orbital radius is 7.51×107 m. The mass of the satellite is 5415 kg and the mass of Earth is 5.974×1024 kg. Determine the orbital speed of the satellite in mi/s. 1 mi/s = 1609 m/s.
Saturday, February 26, 2011 at 11:54am

(I have no idea how to even approach this question. Can anyone please help me?) Some people have proposed that the earth could solve its population problem by shipping people off to space colonies, each containing about 10,000 people. Assuming that we could build such large-...
Friday, February 25, 2011 at 9:28am

College Physics
In the latest Indian Jones film, Indy is supposed to throw a grenade from his car, which is going 93.0 km/h, to his enemy's car, which is going 130km/h. The enemy's car is 17.0m in front of the Indy's when he lets go of the grenade. 1)If Indy throws the grenade so ...
Thursday, February 24, 2011 at 10:28pm

Physics
In the latest Indian Jones film, Indy is supposed to throw a grenade from his car, which is going 93.0 km/h, to his enemy's car, which is going 130km/h. The enemy's car is 17.0m in front of the Indy's when he lets go of the grenade. 1)If Indy throws the grenade so ...
Thursday, February 24, 2011 at 10:27pm

Physics
In the latest Indian Jones film, Indy is supposed to throw a grenade from his car, which is going 93.0 km/h, to his enemy's car, which is going 130km/h. The enemy's car is 17.0m in front of the Indy's when he lets go of the grenade. 1)If Indy throws the grenade so ...
Thursday, February 24, 2011 at 10:00pm

6th earth science
Can anyone help with this question If Earth's land features made by process of moving water are likely to be found on other celestial objects? I am trying to help my son but not sure I am understanding the question right myself.
Thursday, February 24, 2011 at 9:55pm

Science
For million of years, wind and rain have worn down the earth. The land is not totally level now because ____. a. other forces keep building up the land b. wind and rain cannot erode solid rock c. for most of those years, wind and rain were scarce d. wind and rain pile dirt ...
Thursday, February 24, 2011 at 9:40pm

Physics
Suppose the Earth was only half the size it is now (half the mass and half the radius), what would "g" be?
Thursday, February 24, 2011 at 8:04pm

physics
It is the year 2305 and the tallest structure in the world has an insane height of 3.19×106 m above the surface of the Earth. A pendulum clock that keeps perfect time on the surface of the Earth is placed at the top of the tower. How long does the clock take to register ...
Thursday, February 24, 2011 at 6:48pm

Science
Which of these would cause a rapid change in the appearance of the Earth's surface? A. Erosion and deposition by a river B. Earthquake C. Summer waves on Galveston's beach D. Weathering of rocks by acid rain
Thursday, February 24, 2011 at 6:29pm

physics
It is the year 2305 and the tallest structure in the world has an insane height of 3.19×106 m above the surface of the Earth. A pendulum clock that keeps perfect time on the surface of the Earth is placed at the top of the tower. How long does the clock take to register ...
Thursday, February 24, 2011 at 4:34pm

earth
Can someone give me a better idea of Precipitation Variability ? and the 4 types of atmospheric lifting, I'm confused and want to understand this better. Convective Lifting Orographic Lifting Frontal Lifting Convergent Lifting
Thursday, February 24, 2011 at 2:05pm

Physics
The force on a 0.80 m wire that is perpendicular to Earth's magnetic field is 0.12 N. What is the current in the wire?
Thursday, February 24, 2011 at 1:11pm

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