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Homework Help: Science: Earth

Recent Homework Questions About Earth

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Earth Science
Both. It takes years for a tree to grow to full size. But the wind constantly blows and the sun constantly produces light.
Thursday, October 4, 2012 at 2:09pm

Earth Science
Renewable resources can be replaced as fast as they are consumed? It is true or false?
Thursday, October 4, 2012 at 12:49pm

physics
The period is given by T = 2 * pi * (r^3/(G*M))^0.5 where T is the period, r is the radius, G is the gravitational constant, M is the mass of the earth convert 621 km to meters look up the Gravitational constant and the mass of the earth in kg plug in the numbers, and solve
Thursday, October 4, 2012 at 12:03pm

Physics 1
Find the ratio of your weight on the Earth to your weight on the surface of the Earth's Moon. WEarth/WEarth's Moon=
Thursday, October 4, 2012 at 11:18am

physics
A space traveler weighs 635 N on earth. What will the traveler weigh on another planet whose radius is three times that of earth and whose mass is twice that of earth?
Thursday, October 4, 2012 at 1:03am

Physics
(a) Calculate the magnitude of the gravitational force exerted on a 488-kg satellite that is a distance of 1.95 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 ...
Thursday, October 4, 2012 at 12:58am

Physics
In tests on earth a lunar surface exploration vehicle (mass = 5.90 103 kg) achieves a forward acceleration of 0.215 m/s2. To achieve this same acceleration on the moon, the vehicle's engines must produce a drive force of 1.64 103 N. What is the magnitude of the frictional ...
Thursday, October 4, 2012 at 12:49am

physics
A 5.9-kg rock and a 3.0 10-4-kg pebble are held near the surface of the earth. (a) Determine the magnitude of the gravitational force exerted on each by the earth.(b) Calculate the magnitude of the acceleration of each object when released.
Wednesday, October 3, 2012 at 11:42pm

physics
The Hubble Space Telescope orbits Earth 621 km above Earth's surface. What is the period of the telescope's orbit? Give answer with 5 significant figures.
Wednesday, October 3, 2012 at 10:24pm

Physics 1
Find the ratio of your weight on the Earth to your weight on the surface of the Earth's Moon. WEarth/WEarth's Moon=
Wednesday, October 3, 2012 at 9:50pm

science
how many days would it take to fly to Jupiter (from Earth) in a space shuttle at 45,000 miles per hour? The minimum distance between the Earth and Jupiter is 365 million miles.
Wednesday, October 3, 2012 at 9:44pm

science
how many days would it take to drive from the earth to the moon at a speed of 75 miles per hour? the average distance from the earth to the moon is 380,000km. 1 km=0.62 miles
Wednesday, October 3, 2012 at 9:42pm

physics
what is the acceleration due to gravity at a distance of 2 earth radii abouve earths surface?
Wednesday, October 3, 2012 at 6:06pm

science
The first key piece of evidence for plate tectonics was the paper by Fred Vine and Drum Matthews showing that the ocean floor had magnetic stripes that are symmetric about the ocean ridge. Basaltic magma is erupted at the ridge and the magnetite in it lines up with the Earth&#...
Tuesday, October 2, 2012 at 8:54pm

Physics
Two satellites, A and B, are in different circular orbits about the earth. The orbital speed of satellite A is thirty-five times that of satellite B. Find the ratio (TA/TB) of the periods of the satellites.
Tuesday, October 2, 2012 at 5:43pm

science
The earth has a magnetic north and south. How does this help up with evidence to support the theory of Continental Drift?
Tuesday, October 2, 2012 at 3:01pm

science
http://www.windows2universe.org/earth/Wa​ter/temp.html
Tuesday, October 2, 2012 at 1:34pm

PHYSICS
A projectile is fired from the surface of the Earth with a speed of 150 meters per second at an angle of 45 degrees above the horizontal. If the ground is level, what is the maximum height reached by the projectile?
Monday, October 1, 2012 at 6:03pm

AP PYHSICS
A projectile is fired from the surface of the Earth with a speed of 150 meters per second at an angle of 45 degrees above the horizontal. If the ground is level, what is the maximum height reached by the projectile?
Monday, October 1, 2012 at 6:02pm

Earth Science
How energy flows through the Earth's system?
Monday, October 1, 2012 at 11:56am

fransis xavier anglo indian
when the sun sets or while rotating earth is not facing the sun, there is darkness everwhere which is referred to as night.. i thimk so!!!
Monday, October 1, 2012 at 10:59am

Physics
An airplane flies 340 km due east, makes a right-angle turn, and then flies 390 km due north. Find the magnitude of the plane’s displace- ment from its starting point. Neglect the curvature of the earth. Answer in units of km
Sunday, September 30, 2012 at 8:06pm

physics
According to Kepler's third law, the orbital period T of a planet is related to the radius R of its orbit by T2 R3. A planet's orbit is larger than Earth's by a factor if 3.39. What is the planet's orbital period?
Sunday, September 30, 2012 at 3:59pm

Physics
Earth
Sunday, September 30, 2012 at 1:25pm

Earth Science
How energy flows through the Earth's system.
Sunday, September 30, 2012 at 1:11pm

earth science
How do astronomers use satellites?
Sunday, September 30, 2012 at 12:29pm

Earth science
No. The sun is earth's source of energy.
Sunday, September 30, 2012 at 11:33am

eath science
is moon a source of earth's energy?
Sunday, September 30, 2012 at 11:10am

geography
http://www.enchantedlearning.com/subject​s/astronomy/planets/earth/Continents.sht​ml
Saturday, September 29, 2012 at 8:47pm

physics
Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 . When a horizontal force of 340 is applied to a 68.0 box, the box slides on a level floor, opposed by a force of kinetic friction of 150 . Part A What is the magnitude of the ...
Saturday, September 29, 2012 at 8:32pm

physics
A 125 object is taken to a height of 210 above the Earth's surface. Part A What is the object's mass at this height? Part B What is the object's weight at this height?
Saturday, September 29, 2012 at 8:31pm

physics
Unless otherwise stated, all objects are located near the Earth's surface, where = 9.8 . A hockey puck with a weight of 0.80 is sliding freely across a section of very smooth (frictionless) horizontal ice. Part A When it is sliding freely, how does the upward force of the ...
Saturday, September 29, 2012 at 8:29pm

physics
Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 . A block of mass 23.0 slides down a frictionless surface inclined at 35. Part A To ensure that the block does not accelerate, what is the magnitude of the smallest force that you must ...
Saturday, September 29, 2012 at 8:26pm

physics
Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 . A 3000 truck tows a 1500 car by a chain. Part A If the net forward force on the truck by the ground is 3500 , what is the acceleration of the car? Part B What is the tension in the ...
Saturday, September 29, 2012 at 8:14pm

Earth Science
Compare the two soil types; how much water do you think each would retain. That Area A is a desert and Area B a swamp, should give you some idea.
Saturday, September 29, 2012 at 4:16pm

Earth Science
Two different areas of the United States receive the same amount of rainfall during a day. Area A has soil that contains many large pores and rocks made of sandstone. The soil in Area B is mainly heavy clay. Area A is a desert. Area B is a swamp. For each area (Area A and Area...
Saturday, September 29, 2012 at 12:43pm

Physics
Your basic equations are Newtons gravity equation, and centripetal force. Set them equal. Then remember velocity=2PI r/Period keep units in SI. Remember the trick in a: when you find r, subtract the radius of earth. Why are you grazing for answers? I will check your work if ...
Saturday, September 29, 2012 at 10:35am

Physics
A spy satellite is in circular orbit around Earth. It makes one revolution in 6.01 hours. (a) How high above Earth's surface is the satellite? [Answer in Km] (b) What is the satellite's acceleration? [Answer in m/s^2] I see this posted over and over again and I have ...
Saturday, September 29, 2012 at 2:00am

earth
rank what from smallest to largest? You've been duped - read the question.
Saturday, September 29, 2012 at 1:19am

7th grade social studies
Explain the quote by Samuel de Champlain in your own words. "Through (exploration) we gain knowledge of different countries, regions and kingdoms; through it we attract and bring into our countries all kinds of riches; through it... Christianity (is spread)in all parts ...
Friday, September 28, 2012 at 6:03pm

Earth Science
Does energy flows through the Earth's system by heat?
Friday, September 28, 2012 at 11:55am

Earth Science
http://www.mpg.de/19314/carbon_cycle http://www.esrl.noaa.gov/research/themes​/carbon/
Friday, September 28, 2012 at 11:51am

Earth Science
Can someone five me an example of how carbon cycles through the Earth's system?
Friday, September 28, 2012 at 11:46am

English
What on earth are you evaluating? Novel? Short story? Biography? A child's academic progress? A scientific experiment? Choice of clothing to wear to a party? Please clarify, and state what you think the clear criteria are.
Thursday, September 27, 2012 at 9:51pm

English
On April 12, 1961, Yuri Gagarin became the first person to orbit Earth. How does the underlined phrase function in the sentence? appositive with nonessential information appositive with essential information adverb prepositional phrase adjective prepositional phrase
Thursday, September 27, 2012 at 5:11pm

physics
Calculate the velocity needed for an object starting at the Earth's surface to just barely reach a satellite in a geosynchronous orbit. Ignore air drag and assume the object has a speed of zero when it reaches the satellite. (The orbital radius of a satellite in a ...
Thursday, September 27, 2012 at 1:19pm

Math/Trig
An airplane leaves an airport and flies due west 150 miles and then 170 miles in the direction 210°50'. Assuming the Earth is flat, how far is the plane from the airport at this time (to the nearest mile)
Thursday, September 27, 2012 at 10:15am

physics
A bag of sugar weighs 2.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? N Repeat for Jupiter, where g is 2.64 times that on Earth. N Find the mass of the bag of sugar in kilograms at each of the three ...
Wednesday, September 26, 2012 at 11:05pm

earth Geology
This is just a question that I was curious about, why do mountain belts run parallel to coastlines? Thanks
Wednesday, September 26, 2012 at 11:03pm

science plzzz help
Mass vs. Weight: Although the terms mass and weight are used almost interchangeably, there is a difference between them. Mass is a measure of the quantity of matter, which is constant all over the universe. Weight is proportional to mass but depends on location in the universe...
Wednesday, September 26, 2012 at 10:04pm

phy101
Calculate the velocity needed for an object starting at the Earth's surface to just barely reach a satellite in a geosynchronous orbit. Ignore air drag and assume the object has a speed of zero when it reaches the satellite. (The orbital radius of a satellite in a ...
Wednesday, September 26, 2012 at 8:38pm

7th grade Science help
1. _______ is energy that flows from an object with a higher temperature to an object with a lower temperature. (1 point) Heat Radiation Potential Chemical 2. The transfer of energy that occurs when molecules bump into one another is called _____. (1 point) radiation ...
Wednesday, September 26, 2012 at 7:51pm

science
1. Force exerted on an area is called _____. (1 point) pressure temperature gravity mass 2. The composition of the atmosphere is changing due to _____. (1 point) smog ozone depletion increase in CO2 (carbon dioxide) all of the above 3. The _____ is the layer of the atmosphere ...
Wednesday, September 26, 2012 at 7:15pm

Physics
The satellite's weight is inversely proportional to the distance from the center of the Earth. Using that fact, try to figure out the correct answer. The satellite is not weightless, although the astronauts inside may think so.
Wednesday, September 26, 2012 at 2:37am

Physics
If you suddenly multiplied the mass of Earth by a factor of 4, how would the period of a satellite change, if the radius of its orbit did not change? 4 times as long 1/4 as long 2 times as long 1/2 as long Unchanged
Wednesday, September 26, 2012 at 2:31am

Physics
A satellite sitting on the ground has a weight of 5000 N. When it is placed in orbit 500 km above the surface of the Earth (which has a radius of 6380 km), which choice best describes its weight? Very small but slightly greater than zero. Zero. Still 5000 N. Slightly less than...
Wednesday, September 26, 2012 at 2:28am

Physics
It will rise until it gains potential energy equal to the initial kinetic energy. That will happen at height H given by M g H = (M/2) Vo^2 which can be rewritten H = Vo^2/(2 g) Use 5.2 m/s^2 for g, not the Earth's surface value of 9.8 m/s^2. H = 10.6 m
Wednesday, September 26, 2012 at 12:12am

7th grade science
1) a classmate states that igneous rock must always become sedimentary rock next, according to the rock cycle. explain why this statement is incorrect. 2)why would granite have larger crystals than igneous rock s formed when lava cooled above the earth's surface?
Tuesday, September 25, 2012 at 11:00pm

Physics
gravity always accelerates objects toward the center of the Earth
Tuesday, September 25, 2012 at 9:43pm

Physics
A person can jump a horizontal distance of 3.10 m on Earth, where the free-fall acceleration, g = 9.81 m/s2. (a) How far could the person jump on the moon, where the free-fall acceleration is g/6 m (b) How far could the person jump on Mars where the acceleration due to gravity...
Tuesday, September 25, 2012 at 9:17pm

Physics
On some planet other than Earth a ball is thrown upward at a velocity of 22.3 m/s. It returns back to the exact position that it started at in 8.8s. What is this planets value for "g"? (
Tuesday, September 25, 2012 at 8:15pm

Maths
Calculate the density of earth given that its mass is 5.98x10^24 kg and volume is 8.78x10^8 m/s
Tuesday, September 25, 2012 at 5:37pm

economics
1500 * 1.15 = $1,725. Where on earth do you find a savings account that pays more than 1% interest???
Tuesday, September 25, 2012 at 12:53pm

Physics
HUH ????????? Although weight changes with g mass DOES NOT !!!!!! Your mass is the same on the moon, but your weight is earth weight/6 weight = m g
Monday, September 24, 2012 at 8:14pm

Earth Science
determine the slope of an area, given the following: Start measuring at 700ft. measure a distance of 4 miles, and end at an elevation of 2432ft
Monday, September 24, 2012 at 8:05pm

writing
I have been trying to work on this assignment and I am not really understanding it and I try to get help from my teacher and she keeps sending me this and telling me when I do this she will help me with the rest but I don't understand this and I have told her this and she ...
Monday, September 24, 2012 at 6:45pm

college physics
Your teacher is misleading you greatly. Be careful. I am wondering if you actually have a physics major teacher. I will solve this question: If a 79 kg astronaut is orbiting Earth with an orbital radius of 5.31×107 m, determine how much the astronaut would weigh ON EARTH...
Monday, September 24, 2012 at 4:33pm

college physics
A new planet has been discovered that has a mass one-tenth that of Earth and a radius that is one-sixth that of Earth. Determine the free fall acceleration on the surface of this planet. Express your answer in the appropriate mks units.
Monday, September 24, 2012 at 4:19pm

college physics
Although astronauts appear weightless, they are not. They only appear weightless because they are in free fall. If a 79 kg astronaut is orbiting Earth with an orbital radius of 5.31×107 m, determine how much the astronaut would weigh. Earth's mass is 5.974 1024 kg.
Monday, September 24, 2012 at 4:17pm

college physics
new planet is discovered orbiting a distant star. Observations have confirmed that the planet has a circular orbit with a radius of 21 AU and takes 118 days to orbit the star. Determine the mass of the star. State your answer with appropriate mks units. [NOTE: AU stands for &...
Monday, September 24, 2012 at 4:17pm

earth
how long would it take a radio wave with a frequency of 4.3 X10 to the 5th power Hz to travel from Mars to Earth if the distance between the two planets is approximately 8.00 x 10 to the 7th power km?
Sunday, September 23, 2012 at 7:44pm

downward?
I assume you mean upward the ball has the same Kinetic energy at release in both cases (1/2) m V^2 = m g h so h = .5 V^2/g if g is 1/6 that on earth, h will be 6 times higher on the moon
Sunday, September 23, 2012 at 6:54pm

physics
A ball is thrown straight downward from the surface of the moon. Is the maximum height it reaches less than, equal to, or greater than the maximum height reached by a ball thrown upwards on the earth with the same initial speed? Ignore air resistance in both cases
Sunday, September 23, 2012 at 6:49pm

physics
Your friend weighs 145 lb. What is her mass in kilograms if she went to the moon where the acceleration of gravity is 1/6 that on earth? i know that her weight in newtons is 652.5, and that her mass in kilograms is 65.25, and that her weight in newtons if she went to the moon ...
Sunday, September 23, 2012 at 3:28pm

history
For heaven's sake! How on earth can you introduce something you don't know about?? It's impossible!
Sunday, September 23, 2012 at 2:55pm

Physics
A) Gravity pulls an area of wet soil and rock downward in a landslide B) An ... Many people know that the weight of an object varies on different planets, but did ... If the Earth's gravitational force causes a falling 74 kg student to accelerate .... the acceleration of ...
Sunday, September 23, 2012 at 1:00pm

Physics
At what DISTANCE from the earth's surface will a mass of 5.0kg be just 45.0N in weight
Sunday, September 23, 2012 at 8:55am

Physics
At what distance from the earth's surface with a mass of 5.0kg be just 45.0N in weight. HELP
Sunday, September 23, 2012 at 8:42am

physics
an airplane with a speed of 40.4 m/s is climbing upward at an angle of 54 degrees with respect to the horizontal. When the planes altitude is 520 m, the pilot releases a package. a. calculate the distance along the ground measured from a point directly beneath the point of ...
Sunday, September 23, 2012 at 2:49am

physics
A projected space station consists of a circular tube that will rotate about its center (like a tubular bicycle tire) as shown in the figure . The circle formed by the tube has a diameter of about 1.1 km. What must be the rotation speed (revolutions per day) if an effect equal...
Saturday, September 22, 2012 at 8:00pm

Physics
What is the period of Earth's (nearly) circular motion around the Sun? (2*pi*r)/T 1 year (1 year)/(2*pi) (2*pi)/(1 year) 2*pi*(1 year)
Saturday, September 22, 2012 at 7:15pm

Physics
The Earth has a mass of 5.97 x10^24 kg and the Moon has a mass of 7.36 x10^22kg. The average distance between the center of the Earth and the center of the moon is 3.84 x10^8m. (a) How far away would the Moon need to be for the magnitude of the gravitational force acting on it...
Friday, September 21, 2012 at 8:32pm

earth
Go to the online dictionary and type in "Geography." Or better yet, open one.
Friday, September 21, 2012 at 12:10am

earth
what is geography?
Thursday, September 20, 2012 at 11:26pm

Physics
The average person passes out at an acceleration of 7g (that is, seven times the gravitational acceleration on Earth). Suppose a car is designed to accelerate at this rate. How much time would be required for the car to accelerate from rest to 59.1 miles per hour?
Thursday, September 20, 2012 at 9:40pm

Math
an interesting variation of this, in which I have had students actually do this outside, is to determine the scale distance from Earth to Pluto. As I recall, and you can work it out, it is about 4000 meters, about 2.5 miles.
Thursday, September 20, 2012 at 2:40pm

Math
Can You help me with this question? The distance from the earth to the sun is about 1.5 X 10^8 km, while the distance from the earth to the moon is about 3.8 X 10^5 km. If a scale model of the solar system is constructed so that the distance from the Earth to the Sun is 100 ...
Thursday, September 20, 2012 at 12:32pm

earth science
astonomer think planets formed from interstellar dust and gased that clumped together in a process is called what?
Thursday, September 20, 2012 at 11:44am

physics
The distance he can cover in a long jump is (Vo^2/g). If he could jump at the same velocity Vo, he would travel six times farther, because of the lower value of g. It isn't that simple however. Space suits would have to be worn. You can run at a higher speed in a track ...
Thursday, September 20, 2012 at 2:18am

physics
(a) If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 3.43 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2
Thursday, September 20, 2012 at 12:02am

Clean Energy
What are some types of clean enregy and what are they? I have geothermal - heat from the Earth, hydropower - water power, wind power, biomass (I don't know what that is), and solar power - sun power. I would really like some help.
Wednesday, September 19, 2012 at 8:33pm

geometry
EARTH COMPLETES ONE FULL ROTATION EACH DAY MAKING THE SUN APPEAR TO RISE AND SET. IF THE SUN PASSES DIRECTLY OVER HEAD, BY HOW MANY DEGREES DOES ITS POSITION IN THE SKY CHANGE EVERY HOUR?
Wednesday, September 19, 2012 at 7:55pm

geometry
The moon is the largest satelite if and only if its for the earth.
Wednesday, September 19, 2012 at 5:27pm

earth science
a table of numbers can be hard to interpret, but a graph provides a visual cue to help see trends and relationships.
Wednesday, September 19, 2012 at 3:18pm

earth science
descibe the advanages of plotting data in graph form
Wednesday, September 19, 2012 at 2:45pm

earth
acceleration on earth: GM/r^2 acceleration on planet X: GM'/(r/2)^2 GM'/(r/2)^2 = 2GM/r^2 4M'/r^2 = 2M/r^2 M' = M/2 makes sense, since with the same mass and half the radius, the force would be 4 times as much.
Wednesday, September 19, 2012 at 1:55pm

analyzing poem
it was a long tim ago when the earth was green where you could see dinosaurs you've never seen.
Wednesday, September 19, 2012 at 1:33pm

earth
a space traveller determines the radius of a planet to be half of earth . After landing on its surface , he finds the acceleration due to gravity to be twice of that of surface of earth. Find the ratio of mass of planet to the earth
Wednesday, September 19, 2012 at 5:53am

Physics
On a distant planet, golf is just as popular as it is on earth. A golfer tees off and drives the ball 4.1 times as far as he would have on earth, given the same initial velocities on both planets. The ball is launched at a speed of 50 m/s at an angle of 32° above the ...
Tuesday, September 18, 2012 at 9:43pm

Chemisrty Lab
I had this question in class and y teacher did this, well part a, with me. The answers are not identical. What we have is: 14in * 1ft/12in=1.17ft*15ft=17.6ft^2...now I know I wont get an answer in time for my class but how on earth are these answers so different
Tuesday, September 18, 2012 at 2:12pm

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