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Homework Help: Science: Earth

Recent Homework Questions About Earth

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Astronomy
Consider the same asteroid initially in the asteroid belt at a distance 3 AU from the Sun, and 2 AU from Earth, which collides with Earth. As it falls towards Earth, it acquires kinetic energy (neglect its initial motion) both by being accelerated towards the Sun and towards ...
Sunday, December 23, 2012 at 2:35pm

Astronomy
Consider an asteroid of radius 2 km and density 2,500 kgm3 impacting the Earth. When it collides with the surface its kinetic energy is, to a large extent, dumped into the environment, some as heat vaporizing rock and some as mechanical energy throwing rock to great distance ...
Sunday, December 23, 2012 at 2:35pm

Astronomy
The volume of a ball is given in terms of its radius by V=4π3R3. Use this to find the average density of Saturn, i.e. the mass per unit volume. Use Earth’s mass in kg from the Table of Constants to express your answer in kgm3. Note for comparison that water has a ...
Sunday, December 23, 2012 at 2:34pm

Astronomy
Saturn’s Moon Janus is observed to orbit the planet with period 0.695 days, grazing the planet with an orbital radius only 2.64 times the radius of the planet itself. Use this information to find the mass of Saturn. Express your answer as a multiple of the mass of Earth M...
Sunday, December 23, 2012 at 2:34pm

Need help with ~Social Stusies!
This is a practice so it's rather extensive but it's important i get the points for it so can u please check it thx! 1. To pinpoint the absolute location of a place, geographers use (1 point) nearby landmarks. the Atlantic and Pacific oceans. the North and South poles...
Saturday, December 22, 2012 at 7:20pm

maths --plse help me..
when you add them by the way that is the total mass. If you want weight on earth, multiply by 9.81 to get weight in Newtons.( m g )
Saturday, December 22, 2012 at 4:56pm

chemistry,science
http://www.windows2universe.org/earth/in​terior/volcano_formation.html
Saturday, December 22, 2012 at 2:08pm

Physics
20,000 km above anywhere in Earth is 26380 km above the center. The spacecraft travels 2*pi*26380*10^3 meters in 11.8*3600 seconds, for a circular orbit. Take the ratio. 3900 m/s is the speed.
Friday, December 21, 2012 at 7:51am

Physics
Kang and Kodos orbit the Earth in a spaceship 20,000 km above Springfield.the period of their orbit (hours) is 11.8 and findthe speed (m/s) their spacecraft travels. b) Speed of spacecraft in meters per second m/s .
Thursday, December 20, 2012 at 10:25pm

Physics
How many times further from the Sun than the Earth is an asteroid with an average orbital period of 7.43 years? (HINT: Let the distance to the Earth be R=1 AU)
Thursday, December 20, 2012 at 10:24pm

Physics
Use Kepler's Laws and data about the Moon to determine the orbital period (hours) of a satellite that is 17512 km above the SURFACE of the Earth. HINT: How does the radius of the Earth affect the problem?
Thursday, December 20, 2012 at 10:20pm

Physics
Kang and Kodos orbit the Earth in a spaceship 20,000 km above Springfield.the period of their orbit (hours) is 11.8 and findthe speed (m/s) their spacecraft travels. b) Speed of spacecraft in meters per second m/s .
Thursday, December 20, 2012 at 10:18pm

Physics...Help!!!
given that Earth's surface gravitaitional field strength has a magnitude of 9.80N/kg, determine the distance(as a multiple of Earth's radius re) above the Earth's surface at which the magnitude of the field strength is 3.20N/kg.
Thursday, December 20, 2012 at 7:37pm

physics
what will happen to the bone structure if earth becomes more dense than its actual density?
Thursday, December 20, 2012 at 5:00pm

Earth science
Use more exclamation points!!!!!!!!!!
Wednesday, December 19, 2012 at 1:27pm

Physics
a ship is heading due north at 7.50 m/s relative to the water. The local current is 1.52 m/s in a direction 42 degree west of north. Find its velocity relative to earth( find both direction and magnitude of the velocity)
Wednesday, December 19, 2012 at 3:41am

Phsyics
The forces are the same, but in opposite directions. The Earth pulls the moon and vice versa. The force is G*M*m/R^2 G = universaL constant of gravity m = lunar mass M = Earth mass R = earth-moon separation The force also equals m*V^2/R where V is the velocity of the moon its ...
Tuesday, December 18, 2012 at 10:51pm

Phsyics
Determine the magnitude and direction of the gravitational force exerted a) on the Moon by Earth and b) on Earth by Moon.
Tuesday, December 18, 2012 at 7:59pm

EArth Science
the mass is same as that of the Earth
Tuesday, December 18, 2012 at 9:56am

algerbra 2
3. Write the function R that models the total number of components that reenter the atmosphere around the earth each year.
Tuesday, December 18, 2012 at 8:32am

earth
10.63
Monday, December 17, 2012 at 5:54pm

Earth Science to DAmon
Give positive and negative effects of climate change in Canada..
Monday, December 17, 2012 at 9:22am

EArth Science
Give positive and negative effects of climate change in Canada..
Monday, December 17, 2012 at 9:21am

science
The troposphere is where we live. Clouds, greenhouse gases and pollution produced there influence the overall albedo and the fraction of sunlight that gets absorbed by the earth as a whole. Winds there influence albedo as well.
Monday, December 17, 2012 at 6:23am

social science
Read the speech below. It is a fictitious political speech by Peter, a candidate for the upcoming national election. Then answer the following questions: List all of the arguments in the speech List all of the non-arguments in the speech List all of the factual contents in the...
Monday, December 17, 2012 at 12:12am

Writing
Read the passage below. It is a fictitious political speech by Peter, a candidate for the upcoming national election. Then answer the following questions: 1. List the arguments 2. List the non-arguments 3. List the facts 4. List the non-facts 5. What statements are subjective...
Sunday, December 16, 2012 at 10:08pm

Physics
The weight of an object on Earth is 350 newtons. On Mars, the same object would weigh 134 newtons. What is the acceleration due to gravity on the surface of Mars, given that it is 9.8 meters/second2 on Earth?
Sunday, December 16, 2012 at 2:17pm

English
What is meant by the subthemes: death as pervading life, time as the essence of death and self destruction, night as the environment of death, and death as the great isolator as applied to Pablo Neruda's poems, especially Residence on Earth?
Sunday, December 16, 2012 at 12:29pm

Physics
W₀=mg g=GM/R². W=mg´, g=GM/(R+h)² ΔW= W₀-W gravitational constant G =6.67•10⁻¹¹ N•m²/kg², Earth’s mass is M = 5.97•10²⁴kg, Earth’s radius is R = 6.378•10⁶ m.
Sunday, December 16, 2012 at 11:17am

EArth Science to DAmON
thanks:-) i know you can answer it..
Saturday, December 15, 2012 at 5:30pm

EArth Science to DAMONpl
My first order guess would be 20 cm. If it went up more here than there, the water would tend to run from here to there and reach equilibrium over a century. HOWEVER, in areas where for example glaciers are melting, it may look like the ocean level is going down because the ...
Saturday, December 15, 2012 at 5:27pm

EArth Science to DAMONpl
If sea level has risen by 20 cm over the past century on the coast of North America,by how much do you think it has risen over the past century on the coast of India?Explain.
Saturday, December 15, 2012 at 5:17pm

PLEASE HELP EARTH SCIENCE EMERGENCY!!!!
wow! That helps me a lot.. Thank You guys for your helps:)
Saturday, December 15, 2012 at 4:02pm

PLEASE HELP EARTH SCIENCE EMERGENCY!!!!
and furthermore: http://www.guardian.co.uk/environment/20​12/nov/11/poles-scientists-antarctic-sea​-ice
Saturday, December 15, 2012 at 3:45pm

PLEASE HELP EARTH SCIENCE EMERGENCY!!!!
ah, here you go: http://en.wikipedia.org/wiki/Arctic_meth​ane_release
Saturday, December 15, 2012 at 3:43pm

PLEASE HELP EARTH SCIENCE EMERGENCY!!!!
These are indeed earth science emergencies.
Saturday, December 15, 2012 at 3:40pm

PLEASE HELP EARTH SCIENCE EMERGENCY!!!!
If you melt year around ice in the earth (permafrost) in northern climates, it may have natural gas, Methane, trapped underneath. The melting could release the methane into the atmosphere. Methane is a greenhouse gas. This is another positive feedback loop.
Saturday, December 15, 2012 at 3:39pm

PLEASE HELP EARTH SCIENCE EMERGENCY!!!!
When the oceans warm up a little they melt arctic ice. That of course is part of warming. However what makes it far worse is that when the ice melts, the bare ocean is exposed and does not reflect the radiation of the sun as effectively as the ice did. That makes the melting ...
Saturday, December 15, 2012 at 3:35pm

PLEASE HELP EARTH SCIENCE EMERGENCY!!!!
http://www.climatechange.gc.ca/default.a​sp?lang=En&n=EEFC609C-1 http://www.ipcc.ch/publications_and_data​/ar4/wg1/en/faq-1-1.html
Saturday, December 15, 2012 at 12:00pm

PLEASE HELP EARTH SCIENCE EMERGENCY!!!!
Describe two complexities about Earth's climate system that results in changes happening faster than expected.
Saturday, December 15, 2012 at 11:53am

algebra please help
The weight M of an object on Mars varies directly as its weighton earth. A person who weighs 95 lb on earth weighs 38 lbs on Mars. How much would a 100 lb person weigh on Mars?
Saturday, December 15, 2012 at 12:03am

Earth Science
Explain why the following statement is incorrect: Climatologists use the data from ice cores to directly measure past temperatures.
Friday, December 14, 2012 at 9:19pm

Earth Science
If sea level has risen by 20 cm over the past century on the coast of North America, by how much do you think it has risen over the past century on the coast of India? Explain.
Friday, December 14, 2012 at 9:07pm

physics
Radio waves of frequency 30 kHz are received at a location 1500 km from a transmitter. The radio reception temporarily “fades” due to destructive interference between the waves travelling parallel to the ground and the waves reflected from a layer (ionosphere) of the...
Friday, December 14, 2012 at 7:07pm

Physics Help
We expect to see a gravitational blue shift. Events on the moon run a bit faster and also because Earth's gravitational field is stronger than moon's.
Friday, December 14, 2012 at 6:58pm

physics
How high does a rocket have to go above the Earth’s surface so that its weight is reduced to 33.7 % of its weight at the Earth’s surface? The radius of the Earth is 6380 km and the universal gravitational constant is 6.67 × 10 −11 N · m 2 /kg 2 . ...
Thursday, December 13, 2012 at 9:33pm

Earth Science
thanks a lot:)
Thursday, December 13, 2012 at 8:12pm

Earth Science
According to the graph at (Broken Link Removed) the answer is No. For temperatures above 6 C, you have to back about 50 million years. Man has quickly turned things around.
Thursday, December 13, 2012 at 8:05pm

Earth Science
Computer models of Earth's climate project increases in the average temperature from 2°C to 6°C by the end of the century. Have these high temperatures ever occurred before in the past 400 000 years?
Thursday, December 13, 2012 at 7:55pm

physics
Doesn't Kepler's law apply? T^2/r^3=constant=for Earth T^2/R^3 r^3=7^2*(92millionmiles)^3/1year^2 r= 92million miles * cuberoot(49)
Thursday, December 13, 2012 at 2:43am

physics
Imagine that a new asteroid is discovered in the solar system with a circular orbit and an orbital period of 7 years. What is the average distance of this object from the Sun in Earth units?
Thursday, December 13, 2012 at 2:30am

Physics
(a) Calculate the magnitude of the gravitational force exerted on a 430-kg satellite that is a distance of 2.81 times earth radii from the center of the earth. (b) What is the magnitude of the gravitational force exerted on the earth by the satellite? (c) Determine the ...
Wednesday, December 12, 2012 at 4:51pm

trigonometry
How do i do them? :l 7. At 2:00 P.M., the angle between the hour and minute hands on a clock is 60° (approximately 1.05 radians). The arc length formed by the two hands is 2.63 inches. What is the radius of the clock in inches? (Round to the nearest tenth.) 10. A pulley ...
Wednesday, December 12, 2012 at 10:10am

Science
The most common mineral of the Earth's continents is quartz, the mineral SiO2.
Wednesday, December 12, 2012 at 6:17am

physics
mg= F =G•m •M/(R+h)² g= G•M/(R+h)² the gravitational constant G =6.67•10⁻¹¹ N•m²/kg², h=3600000 m=3.6•10⁶ m Earth’s mass is M = 5.97•10²⁴kg, Earth’s radius is R = 6.378•10&#...
Wednesday, December 12, 2012 at 6:09am

physics
calculate the value of g at a height of 3600 km above the surface of the earth?
Wednesday, December 12, 2012 at 12:39am

Physics
You substitute g of moon for g of earth in the equation; Then do the calculation for g of earth; divide the two to find the ratio.
Tuesday, December 11, 2012 at 8:19pm

Physics
Compute: a. The velocity of an object orbiting at height of 2 Re above the surface of Earth. b. Compute the orbital period of that object.
Monday, December 10, 2012 at 9:29pm

Physics
How do you find the ratio of the new/ old world periods of a pendulum if the pendulum wee transported from earth to the moon, where the acceleration due to gravity is 1.63m/s^2? Im not sure if we use 9.8 at all, I think I'm supposed to use T=2 pi sqrtL/g.
Monday, December 10, 2012 at 12:47am

Physics
An object of mass .550kg is lifted from the floor to a height of 3.5m at a constant speed. How much work is done by the lifting force (include units)? b.) How much work is done by the Earth on the object? c.) What is the net work done on the object? d.) What is the change in ...
Sunday, December 9, 2012 at 8:28pm

Ag Bio 1
Biodiversity generally increase from Earth's poles to the equator.This means that greater biodiversity in warm areas. Why is biodiversity greater closer to the equator?More living things are able to survive in consistently warm temperature changes during a year.(McDougal ...
Sunday, December 9, 2012 at 3:39pm

Ag Bio 1
Biodiversity generally increase from Earth's poles to the equator.This means that greater biodiversity in warm areas. Why is biodiversity greater closer to the equator?More living things are able to survive in consistently warm temperature changes during a year.(McDougal ...
Sunday, December 9, 2012 at 3:38pm

physics- TEST TMRW PLS HELP!
Why is the following situation impossible? A librarian lifts a book from the ground to a high shelf, doing 20.0 J of work in the lifting process. As he turns his back, the book falls off the shelf back to the ground. The gravitational force from the Earth on the book does 20.0...
Sunday, December 9, 2012 at 8:45am

SCIENCE
Solve this equation for height h, in kilometers: [6378/(6378+h)]^2 = 0.01 Note that an inverse square law is being used. 6378 is the Earth's radius in km.
Sunday, December 9, 2012 at 2:24am

SCIENCE
AT WHAT HEIGHT ABOVE THE EARTH'S SURFACE DOES THE ACCELERATION DUE TO GRAVITY FALL TO 1% OF ITS VALUE AT THE EARTH SURFACE
Sunday, December 9, 2012 at 2:16am

Social Studies
CHAPTER SUMMARY This chapter concentrates on China’s imperial age and emphasizes the cultural and philosophical contributions of this important period. During this time, which corresponds to the European “middle ages,” the most notable feature of Chinese history...
Saturday, December 8, 2012 at 6:14pm

physics- please explain
Why is the following situation impossible? A librarian lifts a book from the ground to a high shelf, doing 20.0 J of work in the lifting process. As he turns his back, the book falls off the shelf back to the ground. The gravitational force from the Earth on the book does 20.0...
Saturday, December 8, 2012 at 3:09pm

thermodynamics
c) Your "density" is a weight density. The mass density is (weight density)/g = 0.9405 slug/ft^3 Total volume is (mass)/(mass density) = 0.311 slug/0.9405 slug/ft^3 = 0.3307 ft^3 Note: the correct value of g at the surface of the Earth is 32.2 ft/s^2, not 31.9. I ...
Saturday, December 8, 2012 at 9:47am

Science
Start with understanding what makes our air currents work the way they do when the Earth is rotating normally. Pay attention to temperature and rotational affects. Then try to find out how these factors that govern air currents change as the Earth slows down. Lastly, given ...
Friday, December 7, 2012 at 4:34pm

Science
If the earth's rotation slowed down, how would that affect the winds in the US?
Friday, December 7, 2012 at 4:28pm

Physics
draw a line between earth's center E and moon's center M. Let the system center of mass be at C. If EC=x, 5.97*10^24*x = 7.4*10^22*(3.8*10^8-x) x = 4.65*10^6 Note that C is very close to E. In fact, it is only Mm/(Me+Mm) = 1.24% of the way to the moon.
Friday, December 7, 2012 at 2:34pm

Physics
How far is the center of mass of the Earth-Moon system from the center of the Earth? The Earth's mass is 5.97e24 Kg, the Moon's mass is 7.4e22 Kg, and the distance between their centers is 3.8e8m.
Friday, December 7, 2012 at 12:35pm

Obesity Pros and Cons
I believe that the black man should rule the earth.
Friday, December 7, 2012 at 11:46am

physics
Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. (a) Calculate the speed of a 94-kg ...
Thursday, December 6, 2012 at 3:34pm

science ocean
You'll find a lot of information about oceans in these sites. http://www.sciencekids.co.nz/sciencefact​s/earth/oceans.html http://wwf.panda.org/about_our_earth/eco​regions/about/habitat_types/habitats/oce​ans/
Thursday, December 6, 2012 at 11:52am

algebra
the formula d=(square root)12,800+h^2 gives the distance d in kilometers to the horizon from a satellite h kilometers above Earth.Find the distance to the horizon to the horizon from a satellite 4200 km above Earth. Round to the nearest kilometer. PLEASE HELP ME
Thursday, December 6, 2012 at 12:05am

BAA App. Essay Help! (please read!)
One of my personal achievements has to do with artistic. When I was in the 7th grade I participated in the 2012 Reflections Competition. The theme was "Diversity Means...". I decided to do visual arts. In my art work, I drew a huge earth and on top of the earth I ...
Wednesday, December 5, 2012 at 10:14pm

BAA App. Essay Help! (please read!)
One of my personal achievements has to do with artistic. When I was in the 7th grade I participate in the 2012 Reflections Competition. The theme was "Diversity Means...". I decided to do visual arts. In my art work, I drew a huge earth and on top of the earth I drew...
Wednesday, December 5, 2012 at 9:03pm

BAA App. Essay Help! (please read!)
One of my personal achievements has to do with artistic. When I was in the 7th grade I participate in the 2012 Reflections Competition. The theme was "Diversity Means...". I decided to do visual arts. In my art work, I drew a huge earth and on top of the earth I ...
Wednesday, December 5, 2012 at 8:52pm

reading
Why do you think the earth's crust is thicker under land than under bodies of water?
Wednesday, December 5, 2012 at 7:22pm

physics
Sally has a mass of 58.0 kg and Earth has a mass of 5.98 1024 kg. The radius of Earth is 6.371 106 m. What is the force of gravitational attraction between Sally and Earth? What is Sally's weight?
Wednesday, December 5, 2012 at 6:50pm

Math 8th Grade Please help
The radius of Earth is 6,371 kilometers. A space shuttle orbits 315 kilometers above the surface of Earth. The space shuttle completes 240° of a revolution around Earth in one hour. What is the average speed of the space shuttle? Choose the closest answer. Please help both...
Wednesday, December 5, 2012 at 4:59pm

science
at what altitide(height above earth's surface) would temperatures be 22 degrees C?
Wednesday, December 5, 2012 at 9:58am

dynamics of rigid bodies
prove that the weight of an object on the moon is approximately one-sixth of its weight on earth
Tuesday, December 4, 2012 at 8:51pm

PHYSICS URGENT! PLEASE FRICTION CASE 2
A 13 kg box is at rest on a level floor. The coefficient of static friction µS = 0.9 and the coefficient of kinetic friction µK = 0.8. Audrey is applying a 140 N push at an angle (=20°) as shown in Figure 1. C) What is the magnitude of FNormal on box from Earth?
Tuesday, December 4, 2012 at 7:14pm

physics
A long, straight wire lies on a horizontal table and carries a current of 3.05 µA. In a vacuum, a proton moves parallel to the wire (opposite the current) with a constant speed of 3.00 104 m/s at a distance d above the wire. Ignoring the magnetic field due to the Earth, ...
Tuesday, December 4, 2012 at 5:01pm

Social Studies
What percentage of the world's earthquakes and active volcanoes occur on the "Ring of Fire"? 1) *10% 2) *20% 3) *50% 4) *80% My Answer. Is It Correct? Please Be Honest. #4: 80% The name of Earth's single, huge continent from over 250 million years ago is 1) *...
Tuesday, December 4, 2012 at 4:40pm

social studies
Despite temperatures of more than 5,000º F, Earth's inner core is solid because of _____________________. a layer of ice just above it. the fact that Earth rotates so quickly. a thickness of over 1,000 miles. great pressure from the layers around it.
Tuesday, December 4, 2012 at 4:32pm

math
What on earth is this? Please explain.
Monday, December 3, 2012 at 10:35pm

Physics
Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. (a) Calculate the speed of a 94-kg ...
Monday, December 3, 2012 at 9:42pm

7th grade Social Studies Ms. Sue
1. Which climate region dominates most of Northern Africa? (1 point) humid continental highland tundra arid 2. What kind of storm covers the largest area? (1 point) rainstorm blizzard hurricane tornado 3. Earth’s climate is affected by latitude, landforms, and a ...
Monday, December 3, 2012 at 8:06pm

Trigonometry
A satellite orbiting the earth in a circular path stays at a constant altitude of 100 kilometers throughout its orbit. Given that the radius of the earth is 6370 kilometers, find the distance that the satellite travels in completing 70% of one complete orbit.
Monday, December 3, 2012 at 7:03pm

Check my answers
1. The division of Earth’s history into smaller units makes up the ____. eras geologic time scale*** periods sequence of events 2. Today, some scientists think that ____. birds evolved from dinosaurs dinosaurs evolved from fish birds evolved from amphibians both a and b...
Monday, December 3, 2012 at 3:11pm

social studies
Multiple Choice 1. While Earth's orbit around the sun takes roughly 365 days, a single rotation of Earth takes about 8 hours. 24 hours. 1 month. 12 months. 2. During the summer solstice in the United States, the ______ _______ is tilted farthest toward the sun. Northern ...
Monday, December 3, 2012 at 2:51pm

maths
A well of diameter 7cm is dug 22.5m deep.The earth taken out it is spread evently all around it to a width of 10.5 to from an embankment .find the height of the embankment.
Monday, December 3, 2012 at 8:53am

Astronomy
You can Google that. The radius of the sun is 696,000 km, roughly 100 times that of the Earth.
Monday, December 3, 2012 at 6:56am

Astronomy
First, convert 2 arc seconds to radians. 2 arc sec*(1 degree/3600 arc sec)/57.3 degree/rad = 9.7*10^-6 rad Finally, multiply that by the distance to the moon. 9.7*10^-6*384,400 = 3.7 km is the smallest resolvable object size. Two arc seconds is typical for a good earth-based ...
Monday, December 3, 2012 at 6:43am

physics
. The space shuttle typically orbits 400 km above the earth's surface. The earth has a mass of 5.98 × 1024 kg and a radius of 6,380 km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttle's cargo bay? ...
Monday, December 3, 2012 at 1:30am

Physics
Use 5.98 × 10 24 kg as the mass of the Earth. A 2350 kg meteorite has a speed of 143 m/s just before colliding head-on with the Earth. Determine the recoil speed of the Earth. Answer in units of m/s
Sunday, December 2, 2012 at 10:42pm

Science
Express mass of the Earth in unit of M. Take ME = 6 x 1024kg.
Sunday, December 2, 2012 at 8:37pm

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