Tuesday
June 18, 2013

# Homework Help: Science: Earth

Physics
What is the distance from the Earth's center to a point outside the Earth where the gravitational acceleration due to the Earth is 1/20 of its value at the Earth's surface?
Sunday, October 3, 2010 at 7:48pm

Science
If Earth's mass were smaller, how would Earth's gravity be affected?
Sunday, October 3, 2010 at 4:56pm

Science
If an astronaut could hop 40 cm high on Jupiter, how high could he or she jump on Earth?
Sunday, October 3, 2010 at 4:52pm

English
I really need to know if the rephrasing is correct. As I'm not a native speaker, I need to consider all the possible alternatives (?).It doesn't matter if the same concept has been repeated all over again.Thank you very much for you cooperation! 1.Kurtz wanted to ...
Sunday, October 3, 2010 at 10:43am

English
Thank you very much for your corrections. Here are some more sentences I'd like you to check. 1.Kurtz wanted to realize (to fulfil) his highly moral ideals but he failed. He wanted his ideals to come true but he failed because he was left alone to face the wilderness of ...
Sunday, October 3, 2010 at 7:07am

College 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 ...
Saturday, October 2, 2010 at 2:09pm

EARTH science
A 100-gram rock has a volume of 35 cubic centimeters. Find the density of the rock.
Friday, October 1, 2010 at 10:47pm

Physics
A Borg cube starship is zooming past Earth with a speed v=0.97c as shown. The cube has side lengths of 3.03 km. What is its volume, measured from Earth? Can someone step me through this problem?
Friday, October 1, 2010 at 9:17pm

Physics
An airplane has a velocity of 454 km/h relative to the moving air. At the same time, a wind blows northward with a speed of 99 km/h relative to earth. The airplane is moving in an easterly direction relative to earth. Find the speed of the airplane to relative to earth. So, i ...
Friday, October 1, 2010 at 4:49pm

physics
A satellite is orbit about earth, its orbital radius is 3.43*10e7m.The mass of the satellite is 9166kg and the mass of earth is 5.974*10e24kg. Determine the orbital speed of the satellite in mi/s. 1mi/s=1609m/s.
Friday, October 1, 2010 at 3:35pm

earth
why was Copernicus model accepted over the geocentric model, even when it did not predict stellar event any better than the geocentric model
Friday, October 1, 2010 at 1:13pm

English
Are any of these examples of imagery, personification, similie, metaphor, connotation, denotation 1) Pam is standing there with Joe's head in sink and this bottle of coloring that is red. Not normal hair color red, red like a maraschino cherry 2) I reach over and rub him ...
Thursday, September 30, 2010 at 8:39pm

Physics
The international space station ISS travels now with a speed of 7352 m/s. Calculate a) the radius of its orbit; b) the height of the orbit; c) the period of its motion around Earth.
Thursday, September 30, 2010 at 10:31am

Earth Science
Please and Thank you. Mercury is 13.6 times more dense than water. If a container can hold 20g of water, how much more massive would an equal volume of mercury be?
Wednesday, September 29, 2010 at 10:59pm

Science
If the acceleration gravity is 1.6m/2 on the moon and you weigh 539 N on earth, how much do weigh on the moon?
Wednesday, September 29, 2010 at 10:34pm

A metroid entering Earth's atmosphere has a speed of 70.0 km/s and a kinetic energry of 2.56 X 10^15 J. What is the mass of the meteroid?
Wednesday, September 29, 2010 at 10:16pm

algebra
Write and solve an inequality to find the approximate circumference of Earth using the following information - the 4 million miles of public roads in the U.S. would: Reach to the moon and back more than eight times, circle the globe more than 157 times
Wednesday, September 29, 2010 at 9:09pm

earth
If the Earth has so much mass, then how does it "float"? (My 8th grade Astronomy class trying to figure this out. -Lauren
Wednesday, September 29, 2010 at 9:06am

Physics question bout falling
Objects that are falling toward Earth in free fall move a)faster and faster. b)slower and slower. c)at a constant velocity. d)slower then faster.
Wednesday, September 29, 2010 at 6:01am

College Physics
A Borg cube starship is zooming past Earth with a speed v=0.97c as shown. The cube has side lengths of 3.03 km. What is its volume, measured from Earth? Can someone step me through this problem?
Tuesday, September 28, 2010 at 4:54pm

geology
We determine the structure of the Earth's core using: a)deep mine shafts b)satellite imaging c)radar and sonar d)seismic wave data e)magnetic resonance imaging
Monday, September 27, 2010 at 7:30pm

Earth and Space Science
Clouds form primarily at the boundary between a)the stratosphere and mesosphere b)the mesosphere and ionosphere c)the troposphere and mesosphere d)the troposphere and stratosphere e)the hydrosphere and troposphere
Monday, September 27, 2010 at 2:41pm

algerbra 1
Antartica comprises about 10.5% of the total land area on earth. antartica has a surface area of about 5,400,000 square miles. what is the total land area on earth? write an equation and slove.
Sunday, September 26, 2010 at 8:00pm

Math
Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets, but did you know that ...
Saturday, September 25, 2010 at 11:44pm

earth - website
I would love my 4th grade students to explore a fun website about the earth and/ or other planets. Do you know any fun and interesting websites that my kids would enjoy exploring while learning about their planet earth.
Saturday, September 25, 2010 at 11:29pm

Science
Ignoring air resistance, an object falling near the surface of the Earth has an acceleration that is: A. constant B. increasing C. decreasing D. dependant on the weight of the object
Saturday, September 25, 2010 at 10:26am

how faraway is Pluto from Earth?
Saturday, September 25, 2010 at 9:15am

Physics
A satellite of mass 5700 orbits the Earth and has a period of 6000 . a) Determine the radius of its circular orbit. b) Determine the magnitude of the Earth's gravitational force on the satellite. c) Determine the altitude of the satellite.
Friday, September 24, 2010 at 9:05pm

Physics
How far would you have to drill into the Earth, to reach a point where your weight is reduced by 8.0 ? Approximate the Earth as a uniform sphere.
Friday, September 24, 2010 at 7:53pm

Science
What are some bad things on Earth ?
Friday, September 24, 2010 at 7:32pm

how many miles is Jupitor from Earth?
Friday, September 24, 2010 at 7:26pm

math
You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on Earth also varies according to the elevation of the object? In particular, the weight of an ...
Friday, September 24, 2010 at 11:08am

earth science
how did cultures throughout history attempt to explain events such as volcano eruptions, earthquakes, and ecipses?
Friday, September 24, 2010 at 12:53am

earth science
If an atom has 17 electrons and its mass number is 35, calculate the following: number of protons, atomic number, and number of neutrons.
Thursday, September 23, 2010 at 8:36pm

science
How can I write a 500 word essay on what agriculture means to me by comparing the pros and cons of early 1900's agriculture, the industrial war, effects of chemical warfare on the agriculture industry, including people, animals, the earth, while basing some of my research ...
Thursday, September 23, 2010 at 4:44pm

It is also one of the oldest lakes on earth. oldest-adjective Hundreds of animals are found only in Lake Baikal or the nearby area. hundreds-adjective nearby-adjective
Wednesday, September 22, 2010 at 11:58pm

465465
A satellite is orbiting the earth just above its surface. The centripetal force making the satellite follow a circular trajectory is just its weight, so its centripetal acceleration is about 9.81 m/s2 (the acceleration due to gravity near the earth's surface). If the earth...
Wednesday, September 22, 2010 at 8:39pm

earth
rachelcarson "silent spring" agriculture and the movement that launched the environmental movement.. Question pros&cons of agriculture based on silent spring, A revolutiondown on the farm, and whole earth discipline compare&contrast Dr. Russ, or others
Wednesday, September 22, 2010 at 12:32pm

earth
compare and contrast the pros and cons of agriculture
Wednesday, September 22, 2010 at 8:20am

Science
What is a light year? How long does it take for light to reach the Earth from the Sun?
Tuesday, September 21, 2010 at 10:46pm

physics
A small map shows New York to be 486 miles in a direction 8° north of east from Columbus. The same map shows that Buffalo is 302 miles in a direction 56° west of north from New York. Assume a flat Earth, and use the given information to find the displacement from ...
Tuesday, September 21, 2010 at 6:37pm

Physics
A chain composed of four identical links is suspended by a rope and does not move. How many force vectors would be drawn on the free body diagram of each link and which direction would they point? My answer: ---------- FIRST LINK (top): Upward force from rope (tension), ...
Tuesday, September 21, 2010 at 5:24pm

science
sedimentary rock is formed from bits and pieces of dirt, clay and sand that have been carried. a) on the earth's crust b) underground c) in rivers and streams d) over mountaintops
Tuesday, September 21, 2010 at 2:30pm

physics
HELP PLEASE!!! A satellite moves in a circular orbit around Earth at a speed of 5085 m/s. (a) Determine the satellite's altitude above the surface of Earth. (b) Determine the period of the satellite's orbit.
Tuesday, September 21, 2010 at 10:27am

geography
What part of a map tells the relationship of distance shown on the map to real distance on the Earth?
Monday, September 20, 2010 at 10:41pm

earth science
Earthquakes and valcanoes change Earths surface quickly. Can you name at least two processes that canchange earhts surface slowly?
Monday, September 20, 2010 at 6:05pm

Science
What are 2 processess that change earth slowly? The ___1____, which includes the__2____ and part of the _____3_____, is divided into plates that carry all of the Earth's lands and oceans. These plates float on a ___4____ layer of rock in the upper mantle called the ___5__...
Monday, September 20, 2010 at 5:50pm

Calc
Recent studies indicate that the average surface temp. of the earth has been rising steadily. Some scientists have modeled the temp. by the linear function T= 0.02t + 8.50, where T is temp. in degrees Celsius and t represents years since 1900. What do the slope and T-intercept...
Monday, September 20, 2010 at 12:16pm

physics
The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 3.5 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X? Answer in units of s.
Monday, September 20, 2010 at 1:51am

geometry
radius of 3960 miles cause there 5280 feet find length in feet by circumference of earth use ~3.14
Monday, September 20, 2010 at 1:34am

English: Puritans
The question is: Why could Winthrop's ideal not be achieved? The paragraph where I have to find the answer: Winthrop describes an ideal society, which, if the Puritans had been able to achieve it, would have been a reasonable facsimile of paradise on Earth. Being human, ...
Sunday, September 19, 2010 at 4:57pm

Algebra
Could you please check my work on these word problems? My solutions just don't seem right, could you please let me know where I may have messed up. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on ...
Sunday, September 19, 2010 at 4:39pm

Math
Could someone please check my work on these word problems? My solutions just don't seem right, could you please let me know where I may have messed up. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object ...
Sunday, September 19, 2010 at 12:55pm

chemistry
When brought to the surface of the moon, will a mass have more or less weight than it did on the surrface of the earth, or will it be the same weight? explain
Sunday, September 19, 2010 at 12:11pm

Physics
How would I approach this problem? What formula would I use to answer each part? Thank you in advance for any guidance... As part of the launch of the space shuttle, solid-rocket boosters (SRBs) first take it to an altitude of 45.0 km while they accelerate it to a speed of ...
Sunday, September 19, 2010 at 10:34am

phy
Why gravitional force and centrietal force is same between earth and moon?
Saturday, September 18, 2010 at 9:22pm

Astronomy
If the sidereal period of the moon was 29.0 days(instead of the 27.32 days) what would be its synodic period? HINT: consider how far around the sun the Earth/Moon will have travelled in 29.0 days
Saturday, September 18, 2010 at 8:22pm

physics
the mean radius of the earth is 6,000,000 meters. Express this value in kilometers
Saturday, September 18, 2010 at 4:44pm

shiloh
a rock on earth has a mass of 250kg.what is its mass and weight on the moon?
Saturday, September 18, 2010 at 10:16am

phy
What is the distance from the Earth's center to a point outside the Earth where the gravitational acceleration due to the Earth is 1/12 of its value at the Earth's surface?
Friday, September 17, 2010 at 6:33pm

Math
Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on Earth also varies according to the elevation of the object? In particular, the weight of an object follows this equation: w=Cr^-2 , where C is a constant...
Friday, September 17, 2010 at 10:02am

Physics
How to find the centripetal acceleration of an object that is at a latitude of 52 degree to the equator given the radius of earth=6400km and angular vel of Earth about its axis=7.3 x 10^-5 rad/s ?
Friday, September 17, 2010 at 9:15am

physics
On your first trip to Planet X you happen to take along a 200g mass, a 40.0 cm long spring a meter tick and a stop watch. You're curious about the acceleration due to gravity on Planet X, where ordinarty tasks seem easier than on earth, but you cant find this info in your ...
Thursday, September 16, 2010 at 11:43pm

Physics
A bag of sugar weighs 4.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? 1 N Repeat for Jupiter, where g is 2.64 times that on Earth. 2 N Find the mass of the bag of sugar in kilograms at each of the three...
Thursday, September 16, 2010 at 4:00pm

physics
A 5.0 gm marble is fired vertically upward using a spring gun. The spring must be compressed 8 cm if the marble is to just reach a target 20 m above the marble’s position on the compressed spring .(a) What is the change in the gravitational potential energy of the marble-...
Thursday, September 16, 2010 at 1:24pm

geography
I am confused. I am to list my full address and say what continent, hemispheres and planet is my address in!! New Orleans, La. Continent - North America. Hemisphere - Northern Hemisphere. Is this correct? Planet - Earth. Is this correct????
Wednesday, September 15, 2010 at 11:53pm

geography
What part of a map tells the relationship of distance shown on the map to real distance on the Earth? My answer is a map scale. Is this correct?
Wednesday, September 15, 2010 at 8:25pm

MATH
Is there a shorter way to answer this question? Radio waves ina vacuum travel a distance equal to seven times the circumference of earth in 1 s. If the radius of Earth is 6 318 138.7m, what is the speed of the radio waves in kilometres per hour?
Wednesday, September 15, 2010 at 8:07pm

Science
Give an example of how animal behavior would chnge if the Earth become hotter in the future.
Wednesday, September 15, 2010 at 5:14pm

Geology
Isochron Diagrams Page 14 of 17 On the control part of the graph select the Rb/Sr option. Rember that the Half-life of Rb-87 is 48.8 Billion Years. Note that the scale on the horizontal axis is now 10 times greater than the vertical axis. Move the slider and watch the slope of...
Wednesday, September 15, 2010 at 3:18pm

Physics/Astronomy
What would a person's weight be on Mars compared to one's weight on Earth?
Tuesday, September 14, 2010 at 11:51pm

Astronomy and Space
Using a telescope, which planets acn be observed from Earth in a crescent moon phase?
Tuesday, September 14, 2010 at 11:39pm

Astronomy
Compared to the Sun's gravitational force on the Earth, what is the Sun's gravitational force on Jupiter. Jupiter's average distance from the Sun=5AU Earth's average distance from the Sun=1AU Jupiter's mass is 300 times larger than Earth. I think the answer...
Tuesday, September 14, 2010 at 11:26pm

Chemistry
A newly discovered giant planet has an aver- age radius 12 times that of the Earth and a mass 722 times that of the Earth. Calculate the ratio of the new planet’s den- sity to the Earth’s density.
Tuesday, September 14, 2010 at 9:55pm

science
how are alkali metals and alkali earth metals different?
Tuesday, September 14, 2010 at 8:26pm

physics
A person is standing at the edge of the water and looking out at the ocean. The height of the person's eyes above the water is h = 1.6m. and the radius of the earth is R = 6.38 X 10^6 m. (a) How far is it to the horizon?
Tuesday, September 14, 2010 at 7:28pm

geography
Match the region to its description. 1. climate _defined by agreements between nations creating free trade zones 2. cultural _defined by average precipitation and temperature 3. economic _defined by factors including language, religion, or customs 4. physical _defined by their...
Tuesday, September 14, 2010 at 3:03am

Chemistry
What properties differ between the elements in the akali metals and the elements in the akaline earth metals? The akali metals have a charge of 1+, and the akaline earth metals have a charge of 2+.
Monday, September 13, 2010 at 8:30pm

gr 12 physics
A person standing at the edge of the water and looking out at the ocean/ The height of the person's eyes above water is h=1.6m. and radius of the earth is R=6.38x10^6m How far is it to the horizon. In other words, what is the distance d from the person's eyes to the ...
Monday, September 13, 2010 at 3:54pm

Earth Science
During the Dinosaur Ages, if there was a region with a mountain range, alluvial plain, and a shallow sea. Which place would it be the most likely for dinosaur fossils to be formed?
Monday, September 13, 2010 at 12:49pm

alegebra
1. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on Earth also varies according to the elevation of the object? In particular, the weight of an object follows this equation: , where C is a constant, and...
Monday, September 13, 2010 at 2:26am

chemistry
Radio waves travel at the speed of light which is 3.00 x 108 m/s. How many minutes does it take for a radio message to reach Earth from Saturn if Saturn is 7.9 x 108 km from Earth?
Sunday, September 12, 2010 at 7:52pm

space
What is the value of g for space-shuttle territory , about 200km above the Earth's surface. Data: Earth's mass is 6x10^24kg, and radius is 6380 km
Sunday, September 12, 2010 at 4:58pm

US History
7. Slavery in Africa differed from slavery as it developed in the Americas in that a. women and children were not enslaved. b. only complete families were enslaved c. enslavement lasted only seven years d. slaves could move up in society and out of slavery D? 13. Which of the ...
Sunday, September 12, 2010 at 2:32pm

Physics
A Chinook (King) salmon (Genus Oncorynchus) can jump out of water with a speed of 6.75 m/s. If the salmon is in a stream with water speed equal to 1.65 m/s, how high in the air can the fish jump if it leaves the water traveling vertically upwards relative to the Earth?
Saturday, September 11, 2010 at 7:40pm

physics
A helicopter is ascending vertically with a speed of 6.50 m/s. At a height of 55 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the helicopter's.]
Thursday, September 9, 2010 at 7:45pm

space
How could measuring the orbit of a comet help scientists understand when it will next be visible from Earth?
Thursday, September 9, 2010 at 7:11pm

English Help Plz
Ovid is a great artist; He used different objects to represent the idea of transformations. He used water, tree, earth and heaven as metamorphosis symbolism .But his stories seems to be fiction in the modern age. For example beautiful daughter of a river god, Daphne ...
Thursday, September 9, 2010 at 8:14am

physics
The earth has a radius of 6380 km and turns around once on its axis in 24 h. 1)What is the radial acceleration of an object at the earth's equator? Give your answer in m/s^2 2) What is the radial acceleration of an object at the earth's equator? Give your answer as a ...
Thursday, September 9, 2010 at 12:54am

physics
On planet Tehar, the acceleration of gravity is the same as that on Earth but there is also a strong downward electric field with the field being uniform close to the planet's surface. A 2.16 kg ball having a charge of 4.80 uC is thrown upward at a speed of 21.0 m/s and it...
Wednesday, September 8, 2010 at 8:00pm

Describe the ways in which the earth's spheres overlap each other?
Wednesday, September 8, 2010 at 5:18pm

Describe the ways in which the earth's spheres overlap each other?
Wednesday, September 8, 2010 at 5:08pm

earth science
What forces are opposing on one another throughout the life of a star and how do they influence the various stages in the life cycle?
Wednesday, September 8, 2010 at 12:28pm

Physics
The diameter of some celestial body is 3080 km. What is the volume of this body? _____m3 How many of these celestial bodies would be needed to create a volume equal to that of Earth? The radius of the Earth is 6.38 106 m.
Tuesday, September 7, 2010 at 12:41pm

calculate the mass in kg of an object that weighs 1,225 N on earth.
Tuesday, September 7, 2010 at 1:48am

Physics II
A man weighs 0.80 kN on Earth. What is his mass in kilograms?
Monday, September 6, 2010 at 6:27pm

physics
The diameter of some celestial body is 3080 km. What is the volume of this body? _____m3 How many of these celestial bodies would be needed to create a volume equal to that of Earth? The radius of the Earth is 6.38 106 m.
Monday, September 6, 2010 at 5:05pm

college physical science
how much would a 80.0kg person weigh on earth where the acceleration of gravity is 1.63m/s2
Monday, September 6, 2010 at 11:57am

English
I need help with these last few questions. I dont know if they are correct,run-on or comma splice. 1. Mary Lou decided not to eat the alphabet soup the letters spelled out" botulism." 2.When English scientist James Smithson died in 1829, he willed his entire fortune ...
Sunday, September 5, 2010 at 7:39pm

Physics
I have two I need help with! 1. An airplane is flying in a horizontal flight level at constant velocity, heading due east. If the weight of the plane is 2.6 x 10^4 N, what is the net force on the plane? a)-2.6x10^4 N b)2.6x10^4 N c)0.0 N d) that due to gravity, which is 2.5x10...
Sunday, September 5, 2010 at 7:12pm

English
Dangling modifiers - are these right? Second entry is my corrected version. 1. In 1883, massive destruction was caused by the eruption of the volcano Krakatoa, an event recently examined in the book Krakatoa: The Day the World Exploded. In 1883, the eruption of the volcano ...
Saturday, September 4, 2010 at 10:36am

precalc
The depletion of the Earth's ozone layer has created concern among some health experts. They believe that dramatic increases in the number of illnesses and deaths due to ultraviolet radiation rays may occur as a result of breaks in the ozone layer. The Environmental ...
Saturday, September 4, 2010 at 7:23am

science
scientists believe that the waters covering the surface of the earth. a)are a recent addition to our planet b) first appeared during the age of dinosaurs c) have been here since the crust solidified d) are slowly drying up e) are not visible from space c
Friday, September 3, 2010 at 4:52pm

science
Scientists believe that the waters covering the surface of the earth? a) are not visible from space b) are slowly drying up c) first appeared during the age of dinosaurs d) are a recent addition to our planet e) have been here since the crust solidified
Friday, September 3, 2010 at 2:12pm

SCIENCE
The smallest of the earth's oceans is the _______ Ocean a) Pacific b) arctic c) indian d) atlantic e)lagon B
Thursday, September 2, 2010 at 5:16pm

SCI/275
Hello, I would like for someone to read my Final for my class SCI/275. The assignment is: Final Project: Mitigation Strategies and Solutions (Due Sunday in the Assignment Section of eEcampus) • Resource: Appendix A • Use the topic you chose as an environmental ...
Thursday, September 2, 2010 at 2:16pm

Astronomy
Imagine that the Earth's axis were tilted parallel to the ecliptic plan like that of the planet Uranus. Describe how the seasons would be different in this scenario than what we currently experience.
Thursday, September 2, 2010 at 1:16pm

The gravitational force on the moon is one -sixth of what it is on Earth. This means that on the Moon you would weigh one-sixth of what you weigh on Earth. How much would you weigh on the moon.
Wednesday, September 1, 2010 at 8:11pm

Critical Thinking
Which of the following statements is not a claim? A) Life exists on planets other than Earth. B) Dare to stay off drugs! C) Something's force equals its mass multiplied by its acceleration. D) Joe owns a pet dog.
Tuesday, August 31, 2010 at 8:14pm

geometry
how do i find the radius of the earth
Tuesday, August 31, 2010 at 4:11pm

earth science
how do members of the biosphere affect the geosphere?
Sunday, August 29, 2010 at 8:48pm

spanish
Part 4—Listening Comprehension Directions: Listen to this short story called “What ought a man to do on earth?”—¿Qué debe hacer sobre la tierra un hombre? You will hear the story two times. After listening to the story, answer these questions...
Sunday, August 29, 2010 at 4:18pm

algebra 1
ASTRONOMY- an object's weight on mars can be found by multiplying 0.38 by the object's weight on mars. a) an object weighs p pounds,on earth. write an expression for its weight on mars. my answer is 0.38p, is it correct? b)dana weights 120 pounds, and her bicycle ...
Thursday, August 26, 2010 at 10:11pm

language
I am trying to do a report on the following and can't find any sites that contain info to make report. Looking for various types of humans that have lived on earth since time began. thanks for any help
Thursday, August 26, 2010 at 8:25pm

science
fog forms whenever there is a loss of heat from the earth through
Thursday, August 26, 2010 at 4:42pm

phy
A helicopter is ascending vertically with a speed of 5.50 m/s. At a height of 155 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the helicopter's.]
Thursday, August 26, 2010 at 3:56pm

science
When cold air moves below warm air (which rises), we feel _______, depending on how fast the air moves. a) an earthquake or earth tremor b) a drizzle or rainstorm c) a breeze or wind d) a tornado or thunderstorm d
Thursday, August 26, 2010 at 12:09pm

English Help 2
Through out her poetry, she seems to be very passionate about her love .she talks about her lover “He seems to me Equal to Gods” .She thinks ,Her love for that man is undesirable .She loves him very much that she worship him like a God. She is at the top of her love...
Thursday, August 26, 2010 at 10:30am

social studies
What do you call maps thatshow features that humans have created on Earth's surface?
Wednesday, August 25, 2010 at 10:11pm

Biology
Some questions on a review that I have no idea! Describe what the earth looked like when it first formed? Why was the presence of oxygen so important keep in mind aerobic,anaerobic respiration and the amount of ATP produced?
Wednesday, August 25, 2010 at 9:53pm

Geograhy
how does wind and water effect earth climate
Wednesday, August 25, 2010 at 9:21pm

Science
How Does Earth's atmosphere make conditions on Earth suitable for living things?
Wednesday, August 25, 2010 at 7:21pm

physics
A unit of area often used in measuring land areas is the hectare, defined as 104 m2. An open-pit coal mine consumes 72 hectares of land, down to a depth of 29 m, each year. What volume of earth, in cubic kilometers, is removed in this time?
Wednesday, August 25, 2010 at 6:17pm

A person standing on Mars would weigh 38% of his earth weight. What is the Mars weight of a person with an earth weight of 55 kilograms?
Wednesday, August 25, 2010 at 11:43am

science
imagine you are in a spaceship flying from the earth - describe what you see from the space and how you feel as it moves out of the gravitation pull of earth?
Wednesday, August 25, 2010 at 8:13am

science
imagine you are in a spaceship flying from the earth - describe what you see from the space and how you feel as it moves out of the gravitation pull of earth?
Wednesday, August 25, 2010 at 8:11am

If your weight is 120 pounds and your mass is 54 kilograms, how would those values change if you were on the moon? The gravitational force on the moon is 1/6 the gravitational force on Earth.
Tuesday, August 24, 2010 at 6:35pm

physics
two llong parallel vertical wires 0.3m apart are placed east-west of one another.The current in the eastely one is 30A and that in the other is 20A.Both currents flow upwards.The earth"smagnetic field is horizontal directed north and has magnetude field B=20x10^-6T....
Tuesday, August 24, 2010 at 7:42am

college physics
An object thrown vertically upward with initial velocity from the surface of the Earth reaches a height H before falling back toward the Earth. If initial velocity is doubled, the object reaches a maximum height equal to ________. Ignore air resistance.
Tuesday, August 24, 2010 at 3:26am

Physics - Satellite Motion
Calculate the acceleration of two different satellites that orbit Earth. one is located at 2.0Earth radii and the other located 4.0Earth radii.
Tuesday, August 24, 2010 at 2:40am

math/chem
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 1000kg. at this concentration, what mass of uranium is present in 1.0 mg of earth's crust?
Monday, August 23, 2010 at 10:13pm

geology
Granite comprising Stone Mountain crystallized from magma tens of kilometers within the Earth, but uplift and erosion has since laid this pluton bare. Assuming that erosion has only slightly modified the original shape of the more durable granite body, which of the igneous ...
Monday, August 23, 2010 at 12:06pm

Physics - Satellite Motion
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 ltitude of the POES?
Monday, August 23, 2010 at 7:38am

physics 1
Antarctica is roughly semicircular, with a radius of 2000km. The average thickness of its ice cover is 3000m. How many cubic cm of ice does Antarctica contain? (Ignore the curvature of Earth).
Sunday, August 22, 2010 at 1:30am

Science
An area in your state has been flooded due to heavy rains. How might scientists from the three main branches of science interact in their study of the flood, its effects, and how future flooding might be controlled? Life science, Earth science, and physical scicence.
Saturday, August 21, 2010 at 8:57pm

Physics - Gravitational force
Find the gravitational force between earth and the sun. I am using the formula Fg = (G*m1*m2)/(r^2) where G = 6.67*10^-11 m1 = 6.0*10^24kg m2 = 2.0*10^30kg r = should i use the sun's radius or the earths (Rearth = 6.38*10^6; Rsun = 6.96*10^8) either way i use i am not ...
Saturday, August 21, 2010 at 3:30pm

science
A type of igenous rock forming from the cooling of magma within the earth's crust is called_____. a) intrusive b) sedimentary c) metamorphic d) extrusive e) volcanic a
Friday, August 20, 2010 at 5:23pm

Sience
video clips from the International Space Station, the astronauts are seen floating around as if there is no force of gravity holding them to the floor. The truth is that the space station is orbiting Earth at a height of only about 175 kilometers above the surface. While this ...
Friday, August 20, 2010 at 2:38pm

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?
Friday, August 20, 2010 at 2:24pm

science
A type of igenous rock forming from the cooling of magma within the earth's crust is called_____. intrusive
Friday, August 20, 2010 at 1:42pm

science
The thin, outer layer of the earth's surface is its_____. a) skin b)crust c) core d) soil e) surface Just need to know if my answer or right or wrong. Thanks! :) b
Friday, August 20, 2010 at 12:18pm

science
The Paleozoic Era is noted for which two changes? a) rocks were formed b) the earth heated up c) people appeared on earth d) mountains were formed Just need to know if my answer or right or wrong. Thanks! :) d
Thursday, August 19, 2010 at 6:52pm

science
Geologists have divided the history of the earth into four different eras. Which era below is not one of the four? a) Mesozoic Era b) Cenozoic Era c) Precambrian Era d) Stone Era e) Paleozoic Era Just need to know if my answer or right or wrong. Thanks! :) c
Thursday, August 19, 2010 at 6:14pm

science
At the beginning of the____Era, the earth had no crust. Just need to know if my answer or right or wrong. Thanks! :) modern era
Thursday, August 19, 2010 at 6:06pm

MAT/117- Appendix E
Answer the following questions. Use Equation Editor to write mathematical expressions and equations. First, save this file to your hard drive by selecting Save As from the File menu. Click the white space below each question to maintain proper formatting. Hint: Pay attention ...
Thursday, August 19, 2010 at 5:42pm

science
________ is the study of the earth. Just need to know if my answer or right or wrong. Thanks! :) Geology (Earth Science)
Thursday, August 19, 2010 at 3:26pm

science
When any spot on the surface of the earth faces the sun, that spot is dark it is night. true false Just need to know if my answer or right or wrong. Thanks! :) false
Thursday, August 19, 2010 at 3:24pm

SCIENCE
The earth revolves around the sun, and the moon revolves around the earth. The moon is held in orbit by the earth's_________. a) regression b) revolution c) gravity d) resolution Just need to know if my answer or right or wrong. Thanks! :) C
Thursday, August 19, 2010 at 3:22pm

SCIENCE
The earth is a______.It has four different layers, some thicker than others.? a) spiral b) rotunda c) sphere d) globule Just need to know if my answer or right or wrong. Thanks! :) C
Thursday, August 19, 2010 at 3:21pm

Algebra
An object weighs 10 lbs and is 200 miles from the center of the earth. Solve for the constant
Thursday, August 19, 2010 at 2:53pm

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