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March 30, 2015

Homework Help: Science: Earth

Recent Homework Questions About Earth

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Physics
When an automobile moves over a wide, closed loop of wire embedded in a road surface, is the magnetic field of the Earth within the loop altered? Is a pulse of current produced? Can you cite a practical application for this at a traffic intersection?
Wednesday, February 13, 2008 at 11:10pm

Math
There are 61 known moons. Mercury and Venus do not have moons, but each of the 7 other planets has at least 1. How do I find the % of total moons for each planet? Earth - 1 Mars - 2 Jupiter- 16 Saturn - 18 Uranus - 15 Neptune - 8 Pluto - 1 Thanks for your help.
Wednesday, February 13, 2008 at 6:32pm

physics
The electron gun in a color TV accelerates the electrons through about 25,000 Volts. Estimate the acceleration of such an electron due to the magnetic field of the earth. Hint: In Atlanta, the Earth's magnetic field has a magnitude of about 5.2 X 10-5 T.
Monday, February 11, 2008 at 11:55pm

Physics
A person with a mass of 85kg. How much in newtons do they weigh on the earth and the moon?
Monday, February 11, 2008 at 6:40pm

Physics
The moon orbits 3.84 x 10^8m form the center of the earth. How fast does the moon travel in meters per second?
Monday, February 11, 2008 at 6:39pm

Physics
Find the gravitational force between the sun and the earth in newtons?
Monday, February 11, 2008 at 6:34pm

physics
An electric power line carries a current of 1600 A in a location where the earth's magnetic field is 4.0*10-5 T. The line makes an angle of 75° with respect to the field. Determine the magnitude of the magnetic force on a 130 m length of line.
Sunday, February 10, 2008 at 8:56pm

physics
The world record for the discus throw is 74.08m , set by Jürgen Schult in 1986.If he had been competing, not on earth, but on Mars, where the acceleration due to gravity is 0.379 what it is on earth, and if he had thrown the discus in exactly the same way as on earth, ...
Sunday, February 10, 2008 at 8:39am

physics
The world record for the discus throw is 74.08m , set by Jürgen Schult in 1986.If he had been competing, not on earth, but on Mars, where the acceleration due to gravity is 0.379 what it is on earth, and if he had thrown the discus in exactly the same way as on earth, ...
Saturday, February 9, 2008 at 6:09pm

Physics
A "dip needle" is a small magnet mounted on a horizontal axis so that it can swivel up or down. Where on Earth will a dip needle point most nearly verically? Where will it point most nearly horizontally?
Saturday, February 9, 2008 at 2:41am

Physics
If you fell into a hole in the Earth how long would it take to reach the center of the earth if your velocity remained constant at 100mph?
Friday, February 8, 2008 at 9:40pm

Physics
The average radius of the earth is 6.38*10^6m. Is the diameter just twice that or 12.8*10^6m. The circumference is 6.28(6.38*10^6)=40.1*10^6m
Friday, February 8, 2008 at 5:57pm

Physics
If you fell into a hole in the Earth how long would it take to reach the center of the earth if your velocity remained constant at 100mph?
Friday, February 8, 2008 at 5:51pm

Physics
If you were to jump from an airplane at an altitude of 15000 ft. and fall toward the Earth at 100 mph how long would it take to reach the surface?
Friday, February 8, 2008 at 5:49pm

Physics
A satellite is in orbit 2500km above the surface of Earth. What is the velocity of the satellite in m/s?
Friday, February 8, 2008 at 5:47pm

science
whats the term? 1)the turning of air masses from their original paths because of earth's rotation 2)high altitude winds that occur in places where trade winds and polar easterlies meet prevailing westerlies
Thursday, February 7, 2008 at 11:30pm

earth science
where does the energy that drives the rock cycle come from
Thursday, February 7, 2008 at 5:10pm

Earth Science
What is the primary cause of surface currents?
Thursday, February 7, 2008 at 1:18pm

SCIENCE
ARE ANY OF THE 9 PLANETS WITHIN OUR SOLAR SYSTEM A LIGHT YEAR OR MORE AWAY FROM EARTH?
Thursday, February 7, 2008 at 11:26am

SCIENCE
ON A PLANET IN THE YEAR 2000 YOU ARE OBSERVING AMERICA'S BICENTENNIAL CELEBRATION IN BOSTON, MASSACHUETTS. HOW MANY LIGHT YEARS AWAY ARE YOU FROM EARTH. HOW FAR ARE YOU IN KILOMETERS
Thursday, February 7, 2008 at 11:25am

Science
A CHILD IS BORN ON EARTH IN 2000. yOU ARE 94.6 TRILLION KILOMETERS AWAY FROM EARTH AND YOU SEE THE CHILD'S 3RD BIRTHDAY. HOW OLD IS THE CHILD AT THE TIME OF THE CHILD'S 3RD BIRTHDAY?
Thursday, February 7, 2008 at 11:24am

physics
the north pole of a compass is attracted to the north magnetic pole of the earth, yet like poles reple. can you resolve this apparent dilemma?
Tuesday, February 5, 2008 at 3:14am

physics
A dip needle is a small magnet mounted on ahorizontal axis so that it can swivel up or down like a compass turned on it's side) where on earth will a dip needle point most nearly vertically? where will it point most nearly horizontally?
Tuesday, February 5, 2008 at 3:06am

Physics
In lightning storms, the potential difference between the earth and the bottom of the thunderclouds can be as high as 35000000 V.The bottoms of the thunderclouds are typically 1500 m above the earth, and can have an area of 110 km^2. Modelling the earth-cloud system as a huge ...
Monday, February 4, 2008 at 9:15pm

Chemistry
People have proposed towing icebergs to arid parts of the earth as a way to deliver freshwater. Explain why icebergs do not contain salts although they are formed by the freezing of ocean water (i.e saltwater)
Monday, February 4, 2008 at 7:02pm

earth
When burning coalin a stove, which kind of energy transformation is taking place?
Monday, February 4, 2008 at 12:40pm

Geometry
how do you make a sketch of the earth, moon, and sun during a solar eclipse so that your sketch contains similar triangles?
Sunday, February 3, 2008 at 11:53pm

algebra2
Suppose it takes 3 days for a space vehicle to travel from Earth to the moon. About how long would it take for the same vehicle traveling at the same speed to Jupiter? Moon - 240,000 mi Jupiter - 391,000,000. The space vehicle would take how many days to reach Jupiter?
Saturday, February 2, 2008 at 4:15pm

Algebra
Thank you bobpursley. In question 2, if sea level is 3963 miles from the center of teh earth can I change the equation to figure out the weight of a 100 pound weight at lea level by doing something like this? 100=sqrt C/3963^2 ?
Friday, February 1, 2008 at 12:27pm

Physics
Each of the following statements has 1, 2, or 3 conceptual flaws. Explain what is wrong with each sentence (I just need help finding a website for this) 1. A rocket moves through space because the exhaust from the rocket's engine pushes against the atmosphere. 2. If an ...
Friday, February 1, 2008 at 12:04pm

Algebra
I was given an answer to a question but what I really need are the steps to get there as I have other questions I need to answer the same way. Solve the equation w=Cr^-2 for r I was given r=C/w This equation is meant to figure out the weight of an object where C is a constant ...
Friday, February 1, 2008 at 12:01pm

science
The thermal energy of volcanoes and natural hot springs comes from trace amounts of radioactive minerals in common rock in the Earth's interior. Why isn't the same kind of rock at the Earth's surface warm to the touch?
Wednesday, January 30, 2008 at 7:57pm

earth
whats limestone used for?
Tuesday, January 29, 2008 at 8:04pm

Response to DWRLS
I am still on this weight and elevation question. w=Cr^2 for r= r= quare root c/w Suppose that an object is 100 pounds at sea level. find the vlaue of C tat makes sense. Sea level is 3963 miles from the center of the earth. Wouldn't this be 100=C/(3963)^2 C=(3963)^2x100?
Tuesday, January 29, 2008 at 5:36pm

Algebra
w=Cr^-2 Suppose that an object is 100 pounds when it is at sea level. Find the value of C that makes the equation true. (Sea level is 3,963 miles from the center of the earth.)
Monday, January 28, 2008 at 6:40pm

Algebra
Solve the equation w=Cr^-2 The weight of an object follows this equation. Where C is a constant, and r is the distance that the object is from the center of the earth. There are too many variables for me to know where to begin. Can someone get me started?
Monday, January 28, 2008 at 5:10pm

earth
The short term condition in the troposphere are called?
Sunday, January 27, 2008 at 5:48pm

Science
What is a good science project to do? I am in 8th grade and am studying earth science. I need to present the project in front of class. Im really nervouse.
Sunday, January 27, 2008 at 3:18pm

biology: the study of life
2. what is meant by the statement "living things do not exist in isolation"? TRUE/FALSE 3.people study biology only if they are planning to become biologists. 4. by studying biology you can better appreciate the great diversity of species on earth and the way each ...
Sunday, January 27, 2008 at 2:56pm

science equations
what is the acceleration of a 8.4 kg mass if a force of 64.8 n is used to move it toward earth?f=mxa
Thursday, January 24, 2008 at 9:36pm

Earth Science
Which one of the following landforms would be created by outwash? 1) Moraines 2) Eskers 3) Drumlins 4) Erractics I have read all I can, but can not get this one. I am sure it is not #4 - Erractics.
Tuesday, January 22, 2008 at 11:04pm

physics
Suppose you had two small boxes, each containing 1.0 g of protons. (a) If one were placed on the moon by an astronaut and the other were left on the earth, and if they were connected by a very light (and very long!) string, what would be the tension in the string? Express your...
Monday, January 21, 2008 at 12:46pm

College Physics
During an electrical storm, clouds can build up very large amounts of charge, and this charge can induce charges on the earth's surface. Sketch the distribution of charges at the earth's surface in the vicinity of a cloud if the cloud is positively charged and the ...
Monday, January 21, 2008 at 11:36am

College Physics
A positively charged rubber rod is moved close to a neutral copper ball that is resting on a nonconducting sheet of plastic. a) Sketch the distribution of the charges on the ball. b) With the rod still close to the ball, a metal wire is briefly connected from the ball to the ...
Monday, January 21, 2008 at 11:25am

physics
The radius of the Earth is approximately 6000 km. The acceleration of an astronaut in a perfectly circular orbit 300 km above the Earth would be most nearly. For this question I simply guessed. I knew "a" was 9.8 on the surface, and my answers were 0, 0.05, 5, 9, and...
Sunday, January 20, 2008 at 10:14pm

physics
How close must two electrons be if the electric force between them is equal to the weight of either at the earth's surface?
Sunday, January 20, 2008 at 3:49am

physics
Two artificial satellites, 1 and 2, orbit the Earth in circular orbits having radii R1 and R2. If R2=2R1, the accelerations a2 and a1 of the satellites are related how?
Saturday, January 19, 2008 at 10:49pm

physics
A newly-discovered plant, "Cosmo", has a mass that is 4 times the mass of the Earth. The radius of the Earth is Re. The gravitational field strength at the surface of Cosmo is equal to that at the surface of the Earth if the radius of Cosmo is equal to... I guess I ...
Saturday, January 19, 2008 at 10:35pm

science
Please help me with these questions I have looked all threw my book but i cant find them. 7. Why are we not sure about the interior of the earth? Do we know for sure why? 12. Some volcanoes are more explosive than others? What makes this diffrence in explosivity occur? 14.What...
Saturday, January 19, 2008 at 6:33pm

physics
is this right? a 50kg barbell can be lifted by usinga force of 180 N. what is the force of gravity on this planet? if the same barbell is lifted on earth, what minimal force is needed? -i got 3.6 for gravity of the unnamed planet; and 49 N for the minimal force to be lifted on...
Thursday, January 17, 2008 at 11:16pm

Calc
Find the velocity of a satellite orbiting above the equator of the earth in geosynchronous orbit (Period=24 hours) in km/hr. The earth's mass M=5.974x10^(24)kg and radius R=6,731 km. G=6.673x10^(-11) m^3/(kg*s^2) Use v=(G*M/R)^(1/2) I plugged everything in and changed the ...
Thursday, January 17, 2008 at 10:54pm

math/physics
Help! I have no idea how to do this. The earth's orbit is nearly circular with a radius R=93x10^6 miles (the eccentricity is e=.017). Find the rate at which the earth's radial vector sweeps out area in units of ft^2/s. What is the magnitude of the vector J=rxr` for the...
Thursday, January 17, 2008 at 10:43pm

Earth Science
Why is a minimum of three seismic stations needed to find the epicenter of an earthquake?
Thursday, January 17, 2008 at 9:13pm

Earth Science
Why is a minimum of three seismic stations needed to find the epicenter of an earthquake?
Thursday, January 17, 2008 at 1:57pm

Navigation
Still studying navigation and am trying to consolidate my knowledge of the navigational triangle. Current interest in particular is how to establish the distance of the unknown side of the PZX triangle. From the assumed position of the ship (Z) to the geographical location of ...
Thursday, January 17, 2008 at 1:00pm

science
desciibe how solar wind can affect the earth
Wednesday, January 16, 2008 at 8:09pm

physics
need the formula to find jupiters orbital period in earth years
Tuesday, January 15, 2008 at 7:52pm

Spherical Trigonometery
I am studying celestial navigation and have come across various ways to solve the navigational triangle. Formulas, tables etc My knowledge is as yet too fragile to be able to evaluate different methods or formulas so here are a couple I have come across if someone else could ...
Tuesday, January 15, 2008 at 12:33pm

Spherical Trigonometery
I am trying to apply the formula cos c = cos a x cos b + sin a x sin b x cos C to find the length of c in my spherical triangle. I am working with 2 examples in a book in which the answers are given. In the first example all the sines & cosines calculated are positive and I ...
Tuesday, January 15, 2008 at 4:21am

physics hey damon one more please! =]
Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body exactly cancel, leaving the craft literally weightless. Take the distance between ...
Monday, January 14, 2008 at 8:24am

physics
An astronaut weighs 696 N on the Earth. What is her weight on planet X, which has a radius Rx = Rearth 1.60 and a mass Mx = Mearth 8.60? -the only equation I know for weight is "w = m x g"...I don't know how to solve for w using force.
Sunday, January 13, 2008 at 1:16pm

science
What are some causes for the changing of Earth's surface?
Friday, January 11, 2008 at 3:23pm

Navigation/maths
I am curious to know what "sight reduction tables" are: I assume they give distance and bearing (azimuth) from one known (or assumed)location on the surface of the earth to another to the accuracy of the tables. Please can someone confirm or correct my assumption. ...
Friday, January 11, 2008 at 1:24am

PHYSICS
Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body exactly cancel, leaving the craft literally weightless. Take the distance between ...
Wednesday, January 9, 2008 at 2:37pm

Earth Science
A.________-large body of air that develops over a particular region; it acquires the characteristics of the area over which it occurs B.__________-boundary between different air masses 1.___-cold air mass pushes under a warm air mass and can cause a narrow band of violent ...
Tuesday, January 8, 2008 at 8:51pm

math
recall that the acceleartion due to earth's gravity is 32 ft/sec^2. from ground level, a projectile is fired straight upward with velocity 90 feet per second. a. what is its velocity after 3 seconds b. when does it hit the ground c. when it hits the ground, what's the ...
Sunday, January 6, 2008 at 5:21pm

science
Relate progressing fossil evidence, changing habitats and climates to multiple adaptations and thus lifestyle changes. My first example is bipedalism but would another one be that sinc the earth got colder intelligence increased which caused humans to learn how to mke tools ...
Thursday, January 3, 2008 at 5:46pm

Earth science
a fault is observed in a road cut, but there is no obvious rock units to correlate on either side of the fault to determine relative movement. How might you determine or even infer whether the hanging wall has moved up or down relative to the footwall
Sunday, December 30, 2007 at 5:01pm

PHYSICSS!!!
still cant get this one? so damon i know you wanna help! or anyone else im open for suggestions haha Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from ...
Wednesday, December 26, 2007 at 12:09am

physics
still cant get this one? so damon i know you wanna help! or anyone else im open for suggestions haha Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from ...
Friday, December 21, 2007 at 1:04pm

Earth Science
What time of day might an early explorer have planned to enter the harbor? When might have he planned to leave?
Thursday, December 20, 2007 at 1:07pm

Earth Science
My question is what is the ability of some natural materials to reflect and absorb sunlight? What do they mean natural materials? I could answer this on my own if I understood what is considered a natural material.
Wednesday, December 19, 2007 at 12:32pm

Earth Science
Why is it generally warmer in a rural area than in an urban area? I have a question: How does the earth's surface heat up or cool down? My answer: the sun heats up the earth darker surfaces are warmer than cooler surfaces. Please help.
Wednesday, December 19, 2007 at 12:29pm

Physics
I still cannot solve this problem: Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body exactly cancel, leaving the craft literally ...
Monday, December 17, 2007 at 10:58pm

Science
The middle layer of the earth, made of solid, hot rock, is the what?
Monday, December 17, 2007 at 6:56pm

Physics
Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body exactly cancel, leaving the craft literally weightless. Take the distance between ...
Monday, December 17, 2007 at 3:14pm

Physics
Suppose that the ratio of the Moon's mass to the Earth's mass is given by 1.200E-2 and that the ratio of the Moon's radius to the Earth's radius is given by 2.700E-1. Calculate the ratio of an astronaut's Moon-weight to Earth-weight. Now it seems like this ...
Sunday, December 16, 2007 at 12:26pm

physics
ok so I really don't get 2d collisions and I thought I knew how to do this one but I have no idea: A 104 kg baseball player jumps up verticlly to catch a baseball of mass .254 kg traveling horizontally with a speed of 28.6 m/s. If the vertical speed of the player is .258 m...
Sunday, December 16, 2007 at 12:09pm

physics
ok so I really don't get 2d collisions and I thought I knew how to do this one but I have no idea: A 104 kg baseball player jumps up verticlly to catch a baseball of mass .254 kg traveling horizontally with a speed of 28.6 m/s. If the vertical speed of the player is .258 m...
Sunday, December 16, 2007 at 12:07pm

Physics
Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body exactly cancel, leaving the craft literally weightless. Take the distance between ...
Sunday, December 16, 2007 at 8:40am

Physics
My last problem for the day: A) The centers of two 11.00 kg spheres are separated by 0.09 m. What is their gravitational attraction? I got 9.96 x 10^-7 N. B) What is the ratio of this attraction to the weight of one of the spheres (at the surface of the Earth)? I'm sure ...
Saturday, December 15, 2007 at 12:12pm

Earth Science
What is a temperature inversion? What causes major temperature inversions in te atmosphere?
Friday, December 14, 2007 at 11:41am

Physics
I thought I did the problem right, but I don't think I came out with the right answer! Please someone check to see if I got this problem right. Calculate the force of gravity between Earth (mass=6.0*10^24 kg) and the moon (mass=7.4*10^22 kg). The average Earth-moon ...
Thursday, December 13, 2007 at 11:19pm

science lab
I did this lab experiment below and I am stumped this question:given the current warming trend of our planet, over time (generations of parents and offspring) what do you predict will happen to the species of wooly worms? THE WOOLY WORM HUNT is an exciting "game" ...
Thursday, December 13, 2007 at 7:52pm

science
THE WOOLY WORM HUNT is an exciting "game" where the students are the Predators, hunting the great (and desirable) wooly worm. The class is given 60 seconds to pick up as many colored wooly worms as possible from the 1400 worms scattered across the Prep's front ...
Thursday, December 13, 2007 at 3:16pm

Astronomy help
If a comet has a perihelion distance of 1.AU and an orbital period of 125 Earth years.. What is the comet's aphelion? Cannot seem to find the correct calculation
Thursday, December 13, 2007 at 3:03pm

Orbital Dynamics
The zero-velocity value of teh Jacobi integral at the L2 point of the Earth-Moon system is C= -1.59411. Suppose a spacecraft is newar Earth (r2=1/60 in our descriptions). Approximately waht speed must the craft have realtive to the rotating system if it is able to reach the L2...
Thursday, December 13, 2007 at 2:27pm

Orbital Dynamics
The zero-velocity value of teh Jacobi integral at the L2 point of the Earth-Moon system is C= -1.59411. Suppose a spacecraft is newar Earth (r2=1/60 in our descriptions). Approximately waht speed must the craft have realtive to the rotating system if it is able to reach the L2...
Thursday, December 13, 2007 at 2:14pm

Astronomy
If a comet has a perihelion distance of 1.AU and an orbital period of 125 Earth years.. What is the comet's aphelion? Cannot seem to find the correct calculation
Thursday, December 13, 2007 at 12:05pm

Biology
Pick the BEST answer: A)Which Of The Following Is An "Excitable Cell"? <4>1) Neuron <3>2) Electron <4>3) Hormone <3>4) Both 1 & 2 <4>5) All Of The Above B)What Is The Popular Molecule That Energizes Many Activities In Cells? <4>1) ...
Wednesday, December 12, 2007 at 8:16am

Science/Biology
Pick the BEST answer: A)Which Of The Following Is An "Excitable Cell"? <4>1) Neuron <3>2) Electron <4>3) Hormone <3>4) Both 1 & 2 <4>5) All Of The Above B)What Is The Popular Molecule That Energizes Many Activities In Cells? <4>1) ...
Tuesday, December 11, 2007 at 1:25pm

science
What if one type of rock was missing from the rock cycle. How would the absence of this rock affect the earth's crust and other geologic formation on our planet?
Saturday, December 8, 2007 at 9:35pm

science
A total solar eclipse is visable anywhere the Moon's umbra ? the earth?
Saturday, December 8, 2007 at 7:32pm

Literature (revision)
Could someone please read over these and tell me if I have them anywhere near correct. Thank you 1. Compare Equaino's treatment that he receives during his enslavement with his treatment on the slave ship. Although some aspects of Equiano's treatmen during his ...
Friday, December 7, 2007 at 9:42pm

Literature
Could someone please read over these and tell me if I have them anywhere near correct. Thank you 1. Compare Equaino's treatment that he receives during his enslavement with his treatment on the slave ship. Although some aspects of Equiano's treatmen during his ...
Friday, December 7, 2007 at 4:01pm

Earth Science
Which particles can wind move most easily? Sand, silt, pebbles, or gravel? I put sand but my teacher marked it wrong. Would it be silt? Pebbles and gravel are pretty heavy.
Wednesday, December 5, 2007 at 6:47pm

earth science
Hello another question: why is yellowstone national park thought to be significant relative to volcanoes. thanks
Tuesday, December 4, 2007 at 5:57pm

Earth Science
Hello, I need help with this question: When and why did eruptions occur with teh volcanoes Pinatubo, Tambora, and mount toba. thanks
Tuesday, December 4, 2007 at 5:56pm

Religion/English
so there's this poem.. God's Grandeur: The world is charged with the grandeur of God. It will falme out, like shinning from shook foil; It father to a greatness, like ooze of oil Crushed. Why do men then now not reck his rod? Generations have trod, have trod, have trod...
Sunday, December 2, 2007 at 7:35pm

Physics -I'm stumped
Europa, a satellite of Jupiter, appears to have an ocean beneath its icy surface. Proposals have been made to send a robotic submarine to Europa to see if there might be life there. There is no atmosphere on Europa, and we shall assume that the surface ice is thin enough that ...
Friday, November 30, 2007 at 7:16pm

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