Monday
May 20, 2013

# Homework Help: Science: Earth

Geography
Here are some questions that I need help on: 7. Similar climates, vegetation, or landforms can be used to divide the earth into a. political aregions. b. formal regions. c. functional regions. d. census regions. I know it's not c or d. I think it's B 11. All of the ...
Monday, January 4, 2010 at 7:26pm

science
what planet has almost the same density as earth?
Monday, January 4, 2010 at 5:56pm

Physics
What is the gravitional potential energy of a 100-kg rocket when it is at a distance of 1.0 x 10^7 m from the center of the earth. {Assume G = 6.7 x 10^ -11 m^3 / kg x s^2 and Earth's mass is 6.0 x 10^ 24 kg} GIVEN: m1 = 100 kg d = 1.0 x 10^7 m Earth's m2 = 6.0 x 10^ ...
Monday, January 4, 2010 at 4:42pm

Earth Science
Two meanings for the horizontal lines on the geologic History NYS chart.
Sunday, January 3, 2010 at 10:25pm

Physics
What is the weight (in Newtons) of an object with a mass of 25 kg on the surface of the Earth?
Sunday, January 3, 2010 at 1:12pm

earth
limestone and marble are both used in sculpting. Limestone become marble under heat and pressure. Classify each rock and tell which would be harder to sculpt
Sunday, January 3, 2010 at 8:17am

Science
In __, the amplitude of the carrier wave is changed to transmit information; the frequency is not changed. In __, the frequency of the carrier wave is changed __ phones and __ phones use radio waves to transmit signals. __ use electromagnetic signals from a base station ...
Sunday, January 3, 2010 at 4:53am

Physics
At the distance of the earth from the sun the pressure exerted by sunlight is avout 10^-5 Pa How much force does this pressure exerted on 10m^2 array of solar cells on a satellite when the array is perpendicular to the direction of the sunlight? If the satellite has a mass of ...
Saturday, January 2, 2010 at 2:40pm

Science
At the distance of the earth from the sun the pressure exerted by sunlight is avout 10^-5 Pa How much force does this pressure exerted on 10m^2 array of solar cells on a satellite when the array is perpendicular to the direction of the sunlight? If the satellite has a mass of ...
Saturday, January 2, 2010 at 2:37pm

physics
Jessica's weight is 540 newtons. According to the Third Law, if the Earth pulls on Jessica with a force of 540 N, then Jessica pulls on the Earth with a force of 540 newtons that acts in the opposite direction. However, if Jessica stumbles while rollerblading, she will ...
Friday, January 1, 2010 at 5:38pm

Physics
I'm having trouble with this question. Some __ objects emit no visible light but are known through __ and radio images; satellite observations __ Earth's atmosphere help scientist study space at wavelengths that do not reach Earth's surface. If you can answer it, I...
Friday, January 1, 2010 at 7:11am

Science
D. _____ has wavelengths between 0.7 and 0.4 millionths of a meter. D1. What you see as different colors are electromagnetic waves of different ______. D2. Red ligh has the _____ wavelengths (lowest frequency); blue light has the _____ wavelengths (highest frequency). E. ...
Friday, January 1, 2010 at 6:41am

Technology
I need help with these two questions: 1. Sheet metal and copper piping are examples of a. natural resources b. industrial products c. consumer products d. standard materials I think it's either B or D 2. Which of the following would be considered part of a primary ...
Thursday, December 31, 2009 at 5:20pm

earth Science
When a river is lengthened due to forward erosion, a _____ has occurred.
Friday, December 25, 2009 at 8:33pm

physics
The Moon's mass is 7.34 x 10^22 kg, and it is 3.8 x 10^8 away from Earth. Earth's mass if 5.97 x 10^24 kg. a. Calculate the gravitional force of attraction between Earth and the Moon. b. Find Earth's gravitional field at the moon. GIVEN: Moon's mass = 7.34 x 10...
Thursday, December 24, 2009 at 2:11pm

Physics
1. The problem statement, all variables and given/known data The asteroid Icarus, though only a few hundred meters across, orbits the Sun like the other planents. Its period is about 410 d. What is its mean distance from the Sun? 2. Relevant equations Keplers Law T_1 ^2 / T_2...
Thursday, December 24, 2009 at 1:26pm

Physics
Light from the Sun reaches Earth in 8.3 min. The speed of light is 3.00 x 10^8 m/s. How far is Earth from the Sun? GIVEN: t = 8.3 min V = 3.00 x 10^8 m/s --> Would acceleration be 9.81 m/s^2? Is it this equation d = Vit + 1/2 a t^2
Wednesday, December 23, 2009 at 9:06pm

physics
i posted this earlier but am now stuck on getting through the algebra 1. The problem statement, all variables and given/known data 13) (II) At what distance from the Earth will a spacecraft on the way to the Moon experiance zero net force due to these two bodies becasue the ...
Wednesday, December 23, 2009 at 8:53pm

Physics
I'm not sure how to go about solving this problem the algebra gets very messy... At what distance formt he EArth will a spacecraft on the way to the Moon experiance zero net force due to there two bodies because the Earth and Moon pull with equal and opposite force? THANKS
Wednesday, December 23, 2009 at 5:32pm

What is a capillary in Earth science terms?
Tuesday, December 22, 2009 at 7:39pm

science
what isthe sun main thing on earth
Tuesday, December 22, 2009 at 3:20pm

Paul
Determien teh mass of the Sun using the known value for the period of the Earth and its distance from the Sun. I do not remeber how to do this F = ma = Fg = GmM/r^2 Period of earth 3.16 E 7 s radius earth to moon = 1.5 E 11 m
Tuesday, December 22, 2009 at 1:42pm

science
suggest only one best method to avoid such a collision if a near earth asteroid of radius 50m strikes the earth surface?
Monday, December 21, 2009 at 2:02pm

science
suggest only one best method to avoid such a collision if an earth asteroid strikes earth surface?
Monday, December 21, 2009 at 1:33pm

science
Suppose a near earth asteroid of radius 50m strikes the earth surface.what could be the impact of such a collision?
Monday, December 21, 2009 at 12:10pm

science
suppose an asteroid of radious 50m strikes the earth surface,what could be the impact of such collision
Saturday, December 19, 2009 at 5:50am

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 1/22 of its value at the Earth's surface? _ m
Friday, December 18, 2009 at 9:54pm

Biology 100
Read Ch. 9, section 9.1, How Did Life Originate? Reasearch a theory about the origin of life on Earth other than the one summarized under Piecing it Together on p. 247 of the text. Use the following key words and Web sites to assist you with your search: Origin of life, ...
Thursday, December 17, 2009 at 10:03pm

Biology 100
Read Ch. 9, section 9.1, How Did Life Originate? Reasearch a theory about the origin of life on Earth other than the one summarized under Piecing it Together on p. 247 of the text. Use the following key words and Web sites to assist you with your search: Origin of life, ...
Thursday, December 17, 2009 at 3:31am

physics
An artificial satellite placed into earth's orbit has a mass of 1250kg. It travels at an average distance of 222.5km above the surface of the earth. The radius of the earth is 6370km. What acceleration due to gravity does the earth give the satellite? I know to find the ...
Wednesday, December 16, 2009 at 12:07pm

physics
Hint: for part I use G = 6.67 times 10 to the negative 11. for part II, you don’t need to do the full calculation, you can just use your knowledge of how force of gravity depends on mass and separation distance. Compare the gravitational force on a 49 kg mass at the ...
Tuesday, December 15, 2009 at 8:04pm

Geography
Which statements describe the management of the earth's resources? Resource management becomes more important as the population increases. Resource management is a global issue. Resource management is a local issue. Resource management is a national issue. Resource ...
Tuesday, December 15, 2009 at 3:19pm

science
HOW COULD MEASURING THE ORBIT OF A COMET HELP SCIENTISTS UNDERSTAND WHEN IT WILL NEXT BE VISIBLE FROM EARTH?
Monday, December 14, 2009 at 6:32pm

SCIENCE
HOW COULD MEASURING THE ORBIT OF A COMET HELP SCIENTISTS UNDERSTAND WHEN IT WILL NEXT BE VISIBLE FROM EARTH?
Monday, December 14, 2009 at 5:16pm

annie
You want to get an idea of the magnitude of magnetic fields produced by overhead power lines. You estimate that a transmission wire is about 11m above the ground. The local power company tells you that the line operates at 13kV and provide a maximum of 86MW to the local area. ...
Monday, December 14, 2009 at 4:41pm

English
1. We will lead your children to the joys of reading. 2. We will lead your children to the joy of reading. 3. We will lead your children to joy of reading. (Which expressions are grammatical? Are both acceptable?) 4. I learn many things in class from her kind teaching. 5. I ...
Saturday, December 12, 2009 at 4:41am

DRAMA
1. "The best in this kind are but shadows" is A. Titania talking about men. B. Theseus talking about plays. C. Demetrius talking about the women he has loved in the past. D. Bottom talking about his fellow craftsmen. 2. One difference between tragedy and comedy is ...
Thursday, December 10, 2009 at 9:30pm

Earth Science
According to Kepler's law of harmonies, which planet takes the longest to orbit the Sun?
Thursday, December 10, 2009 at 6:14pm

earth
what type of magma flows very quickly
Thursday, December 10, 2009 at 11:19am

earth
What does the phrase "salt of truth" mean?
Wednesday, December 9, 2009 at 8:43pm

force of gravity
A satellite orbits around the earth. The mass of the satellite is 1170 kg, and its altitude is 220 km. The mass of the earth is 5.98×1024 kg. The radius of the earth is 6.38×106 m. 1)What is the gravitational force on the satellite? 2)What is the orbital velocity ...
Wednesday, December 9, 2009 at 6:30pm

Science
1. Which one of the following frequencies of a wave in the air can be heard as an audible sound by the human ear? A. 0.10 Hz B. 10 Hz C. 1,000 Hz (my Answer) D. 100,000 Hz 2. If two waves with equal amplitudes and wavelengths travel through a medium in such a way that a ...
Wednesday, December 9, 2009 at 2:37pm

Calc./ Physics
when apollo 15 astronaut David Scott dropped a hammer and a feather on the moon to demostrate that in a vacuum all bodies fall with the same (constant) acceleration, he droppes them from 4 feet above the lunar surface. the television shows them fallen more slowly than on earth...
Wednesday, December 9, 2009 at 12:42am

making copious reference to fanon's text the wretched earth,give as many arguments for anti-colonial violence as you can identify in his essay.evaluate each of the arguments by considering objections against it and see if fanon's argument can be resued from the ...
Tuesday, December 8, 2009 at 10:22am

Earth Science
Considering the amount of energy required to produce animal-based foods and goods, should humans change their habits so they consume products closer to the bottom of the food chain because it is more efficient? PLEASE HELP.
Tuesday, December 8, 2009 at 7:42am

Earth Science
To measure the strength of an earthquake, you can use either a______scale or______scale. A)Richter B)seismograph C)mercalli intensity part:2 A)moment magnitude B)seismogram C)mercalli intensity
Monday, December 7, 2009 at 11:21pm

Science
Deep within the earth, the process of mantle___?___drives plate tectonics A)convection B)subduction C)currents D)condensation
Monday, December 7, 2009 at 11:10pm

science
why is the angle of rays of sunlight so important in determining the amount of energy collected by the earth
Monday, December 7, 2009 at 6:49pm

Poetry, Part 2
1. Hopkins’s use of “seared,” “bleared,” and “smeared” is an example of A. metaphor. C. simile. B. assonance. D. alliteration. 2. A villanelle is A. a narrative poem written in blank verse. B. a formal poem using extensive repetition. C. a ...
Monday, December 7, 2009 at 6:16pm

Earth Science
Where a major earthquake has happened in the past, but not in a while, is called a seismic? a)gap b)wave c)fault d)scale
Monday, December 7, 2009 at 3:52pm

Astronomy
If stars should always be visible, where should you be located on earth? Can I answer this considering the celestial sphere and the ecliptic? I am not sure how...
Sunday, December 6, 2009 at 11:49pm

physics
Calculate the force of gravity on a spacecraft 12800 km above the earth's surface if its mass is 700 kg.
Sunday, December 6, 2009 at 5:23pm

Math
It takes the earth about 31,558,100 seconds to circle the sun. By how many seconds does this exceed the number of seconds in 365 days?
Sunday, December 6, 2009 at 3:18pm

science
scientists often use models to study the movement of earth and it's moon. Why do they use models to study the movements? please help pretty pretty please with cherry on top!
Wednesday, December 2, 2009 at 5:47pm

physics bobpursly help still having trouble
A satellite in a circular orbit around earth with a radius 1.019 times the mean radius of the earth is hit by an incoming meteorite. A large fragment m=60 kg is ejected in the backwards direction so that it is stationary with respect to the earth and falls directly to the ...
Wednesday, December 2, 2009 at 5:24pm

Science
scientists often use models to Study the movement of earth and it's moon. Why do they use models to study the movements?
Wednesday, December 2, 2009 at 4:39pm

physics
A rocket is launched straight up from the earth's surface at a speed of 1.80×104 m/s^2. a)What is its speed when it is very far away from the earth?
Tuesday, December 1, 2009 at 1:13pm

physics!!!!
A spaceship passes Earth at a speed such that γ = 112. A creature aboard the vessel does the Mongoian greeting dance that takes it 21 s (on its clock -- bought on a previous visit -- which is why it reads in seconds) to perform. How long will the welcoming committee on ...
Monday, November 30, 2009 at 5:36pm

physics Bob Pursley plz help
A satellite in a circular orbit around earth with a radius 1.019 times the mean radius of the earth is hit by an incoming meteorite. A large fragment m=60 kg is ejected in the backwards direction so that it is stationary with respect to the earth and falls directly to the ...
Monday, November 30, 2009 at 5:00pm

Physics Meteorite
A satellite in a circular orbit around earth with a radius 1.019 times the mean radius of the earth is hit by an incoming meteorite. A large fragment m=60 kg is ejected in the backwards direction so that it is stationary with respect to the earth and falls directly to the ...
Monday, November 30, 2009 at 2:19pm

physics
what is the mass of a 1000N man on earth?
Sunday, November 29, 2009 at 9:23pm

How is the composition of Uranus different from Earth?
Sunday, November 29, 2009 at 7:57pm

physics
a space shuttle is in a cic ular orbit at a height of 250 km, where the acceleration os earth,s gravity is 93 percent of its surface value. that is the period of its orbit
Saturday, November 28, 2009 at 2:37pm

physics
estimate the rotational kinetic energy of earth, assuming it to be a solid sphere of uniform density
Saturday, November 28, 2009 at 2:34pm

science
can you give me some facts and info bout how plate tectonics accounts for the features and processes that geoscientists observe in the earth -thank you
Friday, November 27, 2009 at 1:33pm

Science
Can you give me some information and facts about the flow of matter and energy in the earth -thank you
Friday, November 27, 2009 at 12:46pm

gr 11 physics
as a rocket carrying a space probe acceleraes away from earth the fuel is being used up and the rocket's mass becomes less when teh mass of a rocket(and its fuel) is M and the distance of teh rocket from eart's centre is 1.5rE, the force of gravitational attraction ...
Thursday, November 26, 2009 at 10:48pm

astronomy
Mars has a mean density less than the mean density of the Earth's mantle. How is it possible that Mars could have a metallic core given this fact? Hint: No calculations are required. Compare the densities used in part a) with the density of mantle rocks like basalt at one ...
Thursday, November 26, 2009 at 2:54am

astrophysics
Mars has a mean density less than the mean density of the Earth's mantle. How is it possible that Mars could have a metallic core given this fact? Hint: No calculations are required. Compare the densities used in part a) with the density of mantle rocks like basalt at one ...
Thursday, November 26, 2009 at 1:46am

astrophysics
1) Every second the Sun outputs 3.90* 10^26 Joules of energy. Power is energy output per unit time and is given in units of Watts (W) where 1 W = 1 Joule per second. The Sun's power output is therefore 3.90*10^26 Watts. This is called the solar luminosity. As this energy ...
Tuesday, November 24, 2009 at 10:12pm

astrophysics
1) Every second the Sun outputs 3.90* 10^26 Joules of energy. Power is energy output per unit time and is given in units of Watts (W) where 1 W = 1 Joule per second. The Sun's power output is therefore 3.90*10^26 Watts. This is called the solar luminosity. As this energy ...
Tuesday, November 24, 2009 at 9:09pm

english II
Error in Sentence Consistency and Parallelism. the answer is b. A.If the rain would stop, then the grounds crew would uncover the infield and the game could resume. B.Cyclists and joggers are everywhere-on country roads, in city streets, on the boardwalk, and in the park. C.A ...
Tuesday, November 24, 2009 at 5:29pm

english II
sentence contain and error in adjectives and adverbs. The answer is a. A.Jupiter is more far away from the sun than is Earth. B.Today slim women are considered beautiful, but in the age of Rubens, pleasingly plump females were in fashion. C.An ace in the outfield, she caught ...
Tuesday, November 24, 2009 at 5:14pm

Math
You are standing on the equator of the earth (radius 3960 miles). What is your linear and angular speed?
Tuesday, November 24, 2009 at 3:38am

each question is 10 points each, and i dont get 4 questions. I am in Earth Science and in 9th grade i would appreciate it if some one would help me. THANKS ! Where have earthquakes occurred most frequently during the last one hundred years? 1) in the polar regions 2) in the ...
Monday, November 23, 2009 at 8:50pm

physics
An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? Is A the correct answer? a) That there is no reaction force-the net force on the object is zero, so the ...
Monday, November 23, 2009 at 7:00pm

physics
An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? I think the answer is B but not sure. a) That there is no reaction force-the net force on the object is ...
Monday, November 23, 2009 at 2:22pm

physics
Mercury is an average distance of 5.79 x 107 km from the Sun. Estimate the length of the Mercurian year given that the Earth is 1.50 108 km from the Sun on the average. An explanation of how to do this would be great, thanks.
Monday, November 23, 2009 at 9:41am

physics
An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? a) That there is no reaction force-the net force on the object is zero, so the reaction force is zero ...
Monday, November 23, 2009 at 9:16am

physics
An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? a) That there is no reaction force-the net force on the object is zero, so the reaction force is zero ...
Sunday, November 22, 2009 at 9:33pm

histroy
what is the name of the first set of humans that was on earth
Sunday, November 22, 2009 at 5:23pm

Atmospheric Science
One of the earliest examples of primitive humans, Australopithecus, lived in Africa between about 4 and 1 million years ago. For what fraction of Earth history have hominids been around?
Sunday, November 22, 2009 at 4:22pm

physics
An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? a) That there is no reaction force-the net force on the object is zero, so the reaction force is zero ...
Sunday, November 22, 2009 at 12:44pm

physics
An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? a) That there is no reaction force-the net force on the object is zero, so the reaction force is zero ...
Sunday, November 22, 2009 at 12:13pm

Physics
The Moon's period of revolution around the Earth is 27.3 d. How far away is the moon?
Sunday, November 22, 2009 at 12:48am

physics
An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? a) That there is no reaction force-the net force on the object is zero, so the reaction force is zero ...
Saturday, November 21, 2009 at 6:32pm

sat essay
assignment:should people always prefer new things, ideas, or values to those of the past? Should people always prefer new thing to the old? Many people argue that we should not accept the new easily and should sick to the old. As far as I am concerned, we must always try our ...
Saturday, November 21, 2009 at 9:00am

physics
It has been suggested that rotating cylinders about 12 mi long and 5.4 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth?
Saturday, November 21, 2009 at 12:54am

Geography
26. Which of the following statements about New Zealand's first inhabitants is NOT true? a. the origin of the Maoris is in dispute by scholars b. the Maoris lost most of their land in the 1800s to British colonists. c. the Maoris are trying to reassert their claims to the ...
Friday, November 20, 2009 at 11:49am

physics
A 71.4 kg satellite orbits the earth at a distance of 7.00E6 m from the center of the earth (a distance of 630 km above the earth's surface). How fast must the satellite be going to maintain its orbit if the free fall acceleration at this distance is 8.14 m/s^2?
Friday, November 20, 2009 at 10:20am

physic
Hi,could anyone help me with this questin please. Thank you so much. some folks on your planet waant to travel to the moon.But what happens to their clocks, it they leave the Earth?for other bodies, like the moon or planets the acceleration due to gravity at their surfaces ...
Friday, November 20, 2009 at 4:20am

Academy of Hospitality and Tourism at Erasmus
What is the earth science tables?
Thursday, November 19, 2009 at 7:10pm

physics
In a gas at standard temperature and pressure, what is the length of the side of a cube that contains a number of molecules equal to the population of the earth (about 6 million people at present)? I know STP is 1 atm and 273K, but I have no clue how to start this problem. Any...
Thursday, November 19, 2009 at 1:28pm

earth science
What effects do convection currents have on the mantle and crust that would not happen if convection currents didn't exist?
Wednesday, November 18, 2009 at 6:47pm

Physics
An asteroid revolves around the Sun with a mean orbital radius twice that of Earth's. Predict the period of the asteroid in Earth years. (6.38*10^6 radius) I dont understand how to solve this problem.
Tuesday, November 17, 2009 at 8:18pm

physics entry
A meteor headed straight towards the earth has an approach speed of 2.00e3 m/s at a distance of 7 earth radii from the center of the earth. What will be its speed when it reaches earth a 6.38e6 m(ignore the effects of atmosphere)?
Tuesday, November 17, 2009 at 6:02pm

English
What makes our earth sick? - Steel cans make the earth sick. - Shampoo makes the earth sick. - Empty bottles make the earth sick. - Plastic bags make the earth sick. - ___________ make/makes the earth sick. (Are the answers all grammatical? What other expressions can we use in...
Tuesday, November 17, 2009 at 3:29pm

Earth Science
What are two forces that cause the Earth's surface to constantly change and what are their effects on the planet? Please help I do homeschooling and I'm super behind in science please answer before 12:00 p.m. on 11-17-09
Tuesday, November 17, 2009 at 12:18pm

Chemistry
About twenty radioisotopes with ultra-long half-lives, from 82 million years (244- Plutonium) to 6 million billion years (50-Vanadium) are found in the earth’s crust, yet no radioisotopes with half-lives less than 70 million years (146- Samarium) are found. Why not? Use ...
Monday, November 16, 2009 at 7:08pm

Thomas Malthus
Thomas Malthus was a clergyman so is it safe to say that he did not believe in anything opposing the bible? Is it safe to say that as a firm believer in faith, he was certain that God created the Earth and the life on it? What can i say about Malthus's views on the Earth&#...
Sunday, November 15, 2009 at 7:57pm

Physics
A satillite is orbiting the earth at a distance of 1.00X10^3 km above the surface of the earth. What is it's speed?
Sunday, November 15, 2009 at 6:59pm

Physics
(a)Compute the value of G at a point in space that is 7.0X10^6 m from the center of the earth. What will be the value of G at a point with a radius twice that in (a)?
Sunday, November 15, 2009 at 6:57pm

Physics
At what speed must a satellite of a mass M be launched horizontally at the surface of the earth if it's orbit is to be a circle just grazing the highest mountains?( assume no air resistance). How much time would elapse between successive passes of this imaginary satillite?
Sunday, November 15, 2009 at 6:53pm

physics
Consider an asteroid with a radius of 15.5 km and a mass of 3.46E+15 kg. Assume the asteroid is roughly spherical. What is the acceleration due to gravity on the surface of the asteroid? Suppose the asteroid spins about an axis through its center, like the Earth, with a ...
Sunday, November 15, 2009 at 3:24pm

ap enviromental
for a very long time, prokaryotes were the only living creatures on earth. how long a period? i would appreciate a straight answer please!!!
Thursday, November 12, 2009 at 11:24pm

physics
A plane flying horizontally above Earth’s surface at 150. meters per second drops a crate. The crate strikes the ground 30.0 seconds later. What is the magnitude of the horizontal component of the crate’s velocity just before it strikes the ground? I know the answer ...
Thursday, November 12, 2009 at 9:12pm

Hurricanes are very dangerous
could you help me find something that will help me write a paragraph on hurricanes are very dangerous to earth and people causing tremendous devastation.
Thursday, November 12, 2009 at 9:04pm

English
Shy I, with earth, share mirth Muse over goodwill's dearth Meaning sinning find in few Due to high IQ, I find you in long queue Bird herd shepherd owl eerie make night dreary Lone lamppost Tree big bloom bird host Hello shallow call wall view On frond shine morn dew Haunt ...
Thursday, November 12, 2009 at 5:54pm

algebra 2
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. 1.1. 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...
Thursday, November 12, 2009 at 1:17pm

algebra
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 the weight of an object on earth also varies ...
Thursday, November 12, 2009 at 1:13pm

algebra
I need help badly with this assignment. If Venus is 33.3 million miles farther from the sun than Mercury, then Earth is 25.6 million miles farther from the sum than venus. When the total of the ditances for these three planets from the sum is 191.2 million miles, how far away ...
Thursday, November 12, 2009 at 11:48am

science
which of earth's spheres extends into all others
Wednesday, November 11, 2009 at 3:36pm

science
which of earth's spheres extends into all others? i think it would be the Biosphere because overlaps virtually the entire hydrosphere and portions of the atmosphere
Wednesday, November 11, 2009 at 3:21pm

science
Which of Earth's spheres extends into all others? explain how
Wednesday, November 11, 2009 at 2:14pm

science
Which of Earth's spheres extends into all others? explain how
Wednesday, November 11, 2009 at 1:46pm

sat essay
please give me some advice. thank u! assignment:Is the way something seems to be not always the same as it actually is ? Most people tend to consider what they see as facts or truth. As far as I am concerned, what we see is sometimes conceiving and misleading. Things are not ...
Wednesday, November 11, 2009 at 4:05am

sat essay
please give me some advice. thank u! assignment:Is the way something seems to be not always the same as it actually is ? Most people tend to consider what they see as facts or truth. As far as I am concerned, what we see is sometimes conceiving and misleading. Things are not ...
Wednesday, November 11, 2009 at 4:05am

earth
What is the difference between a resource and a condition
Tuesday, November 10, 2009 at 12:01pm

English
1. What makes our earth sick? Gases from cars make the earth sick. Paper cups make the earth sick. _________ make(s) the earth sick. _________ make(s) the earth sick. (Would you name what makes the earth sick? The more,the better. The things suitable for the subject? Thank you.)
Tuesday, November 10, 2009 at 12:41am

Physics
Some people believe that the Moon controls their activities. The Moon moves from being directly on the opposite side of Earth from you to be being directly overhead. Assume that the Earth-Moon (center-to-center) distance is 3.82 multiplied by 108 m and Earth's radius is 6....
Monday, November 9, 2009 at 10:49pm

Physics
An astronaut stands on the edge of a lunar crater and throws a half-eaten Twinkie™ horizontally with a velocity of 2.2 m/s. The floor of the crater is 95.4 m below the astronaut. What horizontal distance will the Twinkie™ travel before hitting the floor of the crater...
Monday, November 9, 2009 at 6:52pm

algebra
the profit made fram the sale of a dvd players from a company is found by subtracting the costs from the revenue. p=r+-c. Suppose that the companys revenue can be expressed with the function R(x)=x^2+59x and that the total costs for the company can be determined by the ...
Monday, November 9, 2009 at 1:36pm

Grammar and Composition
I have to write a speech and record it on a tape. Pet Peeve Speec You will create a "Pet Peeve" Speech. A "Pet Peeve" is one of those little every day occurrences that bugs you, upsets you, or frustrates you. You will use the extemporaneous delivery for ...
Sunday, November 8, 2009 at 2:56pm

earth science
Describe the change in duration of insolation from the Equator to the North Pole A) In the winter b) In the summer c) on the Equinox
Sunday, November 8, 2009 at 2:08pm

earth science
Describe the change in duration of insolation from the Equator to the North Pole A) In the winter b) In the summer c) on the Equinox
Sunday, November 8, 2009 at 2:06pm

math
The Moon orbits Earth every 27.3 days. Determine the angular velocity of the Moon, in degrees per day and in radians per day. The radius of the orbit of the Moon is about 384 400 km. How far does the Moon move along an arc of it's orbit every?
Sunday, November 8, 2009 at 12:56pm

What kind of heat transfer cause Earth's najor wind pattern?
Saturday, November 7, 2009 at 8:35pm

Physics
Hi, I had some questions about Physics and Newton’s Three Laws of Motion and was wondering if someone could possibly help me. I wasn't sure if my answers were correct and I need to make sure they are. #1 Write out in words what “acceleration ~ net force” ...
Saturday, November 7, 2009 at 6:47pm

physics - HELP ASAP!
A 3.60 kg ball is dropped from the roof of a building 184.8 m high. While the ball is falling to earth, a horizontal wind exerts a constant force of 12.1 N on the ball. (acceleration of gravity = 9.81 m/s^2) How far from the building does the ball hit the ground? What is the ...
Saturday, November 7, 2009 at 6:11pm

Physics
Hi, I had some questions about Physics and Newton’s Three Laws of Motion and was wondering if someone could possibly help me. Some of the questions I wasn’t sure about the answers. #1 Write out in words what “acceleration ~ net force” means. My Answer: I ...
Saturday, November 7, 2009 at 4:46pm

science
Saturday, November 7, 2009 at 4:33pm

physics
A 3.60 kg ball is dropped from the roof of a building 184.8 m high. While the ball is falling to earth, a horizontal wind exerts a constant force of 12.1 N on the ball. How long does it take to hit the ground? (acceleration of gravity = 9.81 m/s^2)
Friday, November 6, 2009 at 10:45pm

physics
Upon its return voyage from a space mission, the spacecraft has a velocity of 24000km/h at point A, which is 7000km from the center of the earth. Determine the velocity of the spacecraft when it reaches point B, which is 6500km from the center of the earth. The trajectory ...
Friday, November 6, 2009 at 7:04pm

Physics
Jessica's weight is 540 Newtons. According to the Third Law, if the Earth pulls on Jessica with a force of 540N, then Jessica pulls on the Earth with a force of 540 Newtons that acts in the opposite direction. However, if Jessica stumbles while rollerblading, she wil lfall...
Thursday, November 5, 2009 at 3:05pm

Science
where can i find a good site that will show me the change's of the earth's atmosphere?
Thursday, November 5, 2009 at 12:04pm

Physics
You want to make an old-fashioned pendulum clock, with a period of exactly 1.4 second(s). Use the Earth's gravitational acceleration g = 9.8 m/s2. a) Ignoring the size of the pendulum bob, from what length wire should you hang your pendulum bob? .4865 m b) If you release ...
Wednesday, November 4, 2009 at 11:05pm

physics universal gravity
find the gravitaional force of the sun that acts on a 50 kg peron standing on earth. mass of the sun = 2E30 kg distance from sun to earth = 1.5E11 m radius of earth = 6.4E6 m
Wednesday, November 4, 2009 at 5:38pm

Earth Science
Earth is always changing. What are two forces that cause the earth's surface to constantly change and what are their effects on the planet? Please answer within a few minutes.
Wednesday, November 4, 2009 at 1:08pm

Grammar and Compositon Bobpursley
Ok! I put a good hour into this, and I really did try. Please don't be harsh if there are a lot of mistakes. Drafting-Organization Sheet 1)_____________Phone Book Names_________________ 2)_____________John E. Mackintosh_________________ 3)...
Wednesday, November 4, 2009 at 11:25am

physics
A 3.00 kg ball is dropped from the roof of a building 176.4 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 12.0 N on it. a.)How far from the building does the ball hit the ground? b.)How long does it take to hit the ground? c.)What is ...
Wednesday, November 4, 2009 at 11:23am

Essay for AP English
Would someone be willing to critique and edit my essay? Thanks so much! PROMPT: Read the two sermons "Sinners in the Hands of an Angry God" and "Beauty of the World" by Jonathan Edwards. Compare and contrast the rhetorical strategies of tone, lexicon, and ...
Tuesday, November 3, 2009 at 11:59pm

Calc
Newton's Law of Gravitation says that the magnitude F of the force exerted by a body of mass m on a body of mass M is the following. F=(GmM)/r^2 Here G is the gravitational constant and r is the distance between the bodies. (a) Find dF/dr (b) Suppose it is known that Earth...
Tuesday, November 3, 2009 at 9:18pm

physics - forces
Calculate the velocity of a satellite moving in a stable circular orbit about the Earth at a height of 2600 km.
Tuesday, November 3, 2009 at 9:11pm

phyics-universal gravity
A hypothetical planet has a radius 3.3 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface? (downward)
Tuesday, November 3, 2009 at 9:10pm

phyics-universal gravity
Calculate the force of gravity on a spacecraft 6400 km (1 earth radii) above the Earth's surface if its mass is 1600 kg.
Tuesday, November 3, 2009 at 9:09pm

science
The gravitational force of the Earth in relation to the gravitational force of everything else on Earth represents a(n) _____ that causes everything to all toward the center of the earth. Is the answer unbalanced force; balanced force; centrifugal force; or centripetal force?
Tuesday, November 3, 2009 at 6:58pm

earth
how Earth would be different today, if it contained no radioactive material
Tuesday, November 3, 2009 at 4:43pm

Physics
Calculate the acceleration due to the rotation of the Earth of a person in a location 26° northern geographical latitude. Use REarth = 3,686 km for the value of the radius of the Earth.
Tuesday, November 3, 2009 at 4:39pm

Life Science
By living in areas where other organisms inhabit,humans change the environmental conditions for those organisms. Describe two ways humans impact the environment and what the effects are on the earth? Thesse can either be positive or negative. Please answer in a few minutes.
Tuesday, November 3, 2009 at 11:55am

Physics
When a falling meteor is at a distance above the Earth's surface of 2.78 times the Earth's radius, what is its free-fall acceleration caused by the gravitational force exerted on it?
Tuesday, November 3, 2009 at 2:00am

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