Thursday
May 23, 2013

# Homework Help: Science: Earth

physics
A ball is thrown straight upward and then returns to the earth. choosing the positive direction to be upward, sketch a graph of the velocity of this ball against time. where does the velocity change direction? Explain?
Thursday, February 24, 2011 at 9:57am

physics
The International Space Station, launched in November 1998, makes 15.65 revolutions around the earth each day in a circular orbit. Apply Newton's second law to the space station and find its height (in kilometers) above the earth's surface.
Wednesday, February 23, 2011 at 10:55pm

physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a person situated (a) at ...
Wednesday, February 23, 2011 at 7:07pm

physics
An airplane with a speed of 94.9 m/s is climbing upward at an angle of 63.2 ° with respect to the horizontal. When the plane's altitude is 743 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
Wednesday, February 23, 2011 at 6:16pm

pre cal
The radius of the earth is approximately 3960 miles, what is the linear speed of a point on the equator in miles per hour. Round your answer to the nearest mph.
Wednesday, February 23, 2011 at 12:44pm

Earth science
what is the most important reason that sediments at beaches are usually rounded and smooth
Wednesday, February 23, 2011 at 12:30pm

Science / ELA
Can you see if this essay below needs some corrections that may need to be fixed: Rocks go through the rock cycle; each type of rock can be changed into any other type of Rocks. Rocks are continuously formed; soon later the rocks start to erode and then finally form again, ...
Tuesday, February 22, 2011 at 10:46pm

physics
design an experiment that will allow you to determine the length of the soccer field from one set of goal posts to a single goal post at the other end of the field.you may only use one metre stick,and two retort stands.you are not permitted to walk onto the field or the other ...
Tuesday, February 22, 2011 at 10:45pm

Science / ELA
Can you see if this essay below needs some corrections that may need to be fixed: Rocks go through the rock cycle; each type of rock can be changed into any other type of Rocks. Rocks are continuously formed; soon later the rocks start to erode and then finally form again, ...
Tuesday, February 22, 2011 at 9:45pm

physics
One of the tenets of the pseudoscience (i.e., "false science") of astrology is that, in some mysterious way, the positions of the planets at the time of a person's birth somehow influence the characteristics of that person. To see if this proposition seems ...
Tuesday, February 22, 2011 at 1:43pm

Physics
A spy satellite is in circular orbit around Earth. It makes one revolution in 6.00 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] Please provide a step by step explanation of how ...
Tuesday, February 22, 2011 at 1:26pm

physics
2.A spy satellite is in circular orbit around Earth. It makes one revolution in 6.02 hours. (a) How high above Earth's surface is the satellite? (b) What is the satellite's acceleration?
Tuesday, February 22, 2011 at 8:50am

physics
You stand on the seat of a chair and then hop off. During the time you are in flight down to the floor, the Earth is lurching up toward you with an acceleration a. If your mass is 52 kg, what is the value of a? Visualize the Earth as a perfectly solid object.
Tuesday, February 22, 2011 at 5:39am

physics
A 3.3 kg brick is falling at a rate of 35.1 m/s toward the earth at a current height of 14 m. What is the total mechanical energy of the brick?
Monday, February 21, 2011 at 9:54pm

physics
A communications satellite is in a synchronous orbit that is 3.00 107 m directly above the equator. The satellite is located midway between Quito, Equador, and Belem, Brazil; two cities almost on the equator that are separated by a distance of 3.10 106 m. Find the time it ...
Monday, February 21, 2011 at 8:58pm

Physics
The gravitational constant for Earth is gE = 9.8m/s2. The gravitational constant for the planet Mongo is 20 m/s2. If an object has a weight of 10 lbs on earth, what is its weight on Mongo?
Monday, February 21, 2011 at 3:51pm

Physics
The gravitational constant for Earth is gE = 9.8m/s2. The gravitational constant for the planet Mongo is 20 m/s2. If an object has a mass of 10 kg on earth, what is its mass on Mongo?
Monday, February 21, 2011 at 3:51pm

math
The mean radius of the Earth is 6.37 x 106 meters (m). Assuming the earth can be modeled as a perfect sphere a. In cubic meters (m3 ) what is the volume of the Earth? b. In meters (m) what is Earth’s circumference? c. If the mean density is 5.515g/cm3, what is the Earth&#...
Monday, February 21, 2011 at 12:18pm

Science
Ok, so I'm doing a project on the Earth's layers, and I just have a question on the model. DOES IT HAVE TO BE 3-D? If it is, I'm dead meat.
Monday, February 21, 2011 at 9:42am

Physics
What thrust does a 350 model rocket need in order to have a vertical acceleration of 14.0 on the Earth?
Monday, February 21, 2011 at 12:12am

Science
We determine the structure of the Earth's core using ? deep mine shafts. satellite imaging. radar and sonar. seismic wave data. magnetic resonance imaging.
Sunday, February 20, 2011 at 8:17pm

physics
At the surface of Jupiter's moon Io, the acceleration due to gravity is 1.81 . A watermelon has a weight of 43.0 at the surface of the earth. In this problem, use 9.81 for the acceleration due to gravity on earth
Sunday, February 20, 2011 at 7:52pm

Physics
Compare the gravitational force on an 11 kg mass at the surface of the Earth (with radius 6.3 X 10^6 m and mass 6 X 10^24 kg) with that on the surface of the Moon (with mass 1/81.3 ME and radius 0.27 RE). What is the force on the Earth? What is the force on the moon?
Sunday, February 20, 2011 at 7:04pm

Physics
Compare the gravitational force on an 11 kg mass at the surface of the Earth (with radius 6.3 X 10^6 m and mass 6 X 10^24 kg) with that on the surface of the Moon (with mass 1/81.3 ME and radius 0.27 RE). What is the force on the Earth? What is the force on the moon?
Sunday, February 20, 2011 at 7:02pm

earth science
compared to earth, earth jupiter
Sunday, February 20, 2011 at 5:15pm

science/maps
Earths diameter is about 13,000 Kilometers. If a globe has a diameter of 0.5 meter, write the globe's scale as a ratio. What distance on Earth would 1 centimeter on the globe represent?
Sunday, February 20, 2011 at 4:53pm

science
Earth's diamter is about 13,000 kilometers. If a globe has a diameter of 0.5 meter, write the globes scale as a ratio. What distance on earth would 1 centimeter on the golbe repersent?
Sunday, February 20, 2011 at 3:57pm

science
which planet other than earth may be livable by humans?
Saturday, February 19, 2011 at 9:01pm

Physics
Left over from the big-bang beginning of the universe, tiny black holes might still wander through the universe. If one with a mass of 3.5 1011 kg (and a radius of only 1.0 10-14 m) reached Earth, at what distance from your head would its gravitational pull on you match that ...
Saturday, February 19, 2011 at 7:37pm

Physics
What is the magnitude of the apparent weight of a 65 astronaut 3600 from the center of the Earth's Moon in a space vehicle moving at constant velocity?
Saturday, February 19, 2011 at 6:19pm

Earth Science
I need help finding the geological time scale of stone mountain georgia, with a longitudinal, and latitude map of the area.
Saturday, February 19, 2011 at 2:36pm

Science
If the moon rotated on its axis just as quickly as Earth's, would we always see the same side of the moon? Explain. -thanks, Sandra
Saturday, February 19, 2011 at 11:33am

physics
A car travels due east with a speed of 35.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 70.0° with the vertical. Find the velocity of the rain with respect to ...
Friday, February 18, 2011 at 1:50pm

physics
An astronaut on the surface of Mars fires a cannon to launch an experiment package, which leaves the barrel moving horizontally. Assume that the free-fall acceleration on Mars is three eighths that on the Earth.(a) What must be the muzzle speed of the package so that it ...
Friday, February 18, 2011 at 1:03pm

physics
A fisherman sets out upstream from Metaline Falls on the Pend Oreille River in northwestern Washington State. His small boat, powered by an outboard motor, travels at a constant speed v in still water. The water flows at a lower constant speed vw. He has traveled upstream for ...
Friday, February 18, 2011 at 12:33pm

Physical science
The acceleration due to gravity on earth
Friday, February 18, 2011 at 7:22am

English
I left out these few statements on the themes I would like you to check. Thank you very much. 1.Macbeth is the shortest of S’s tragedies; it is simple in its plot but complex in its psychological analyses of what takes place in the mind of the criminal. 2. The hero starts...
Thursday, February 17, 2011 at 6:15pm

science
could someone pleassssse help me answer these questions? do we always see the same side of the moon and how do yuo know for sure? if the moon rotated just asa quickly as earth , would we see the same sides of the moon from earth?explian.
Thursday, February 17, 2011 at 4:36pm

physics
A car travels due east with a speed of 35.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 70.0° with the vertical. Find the velocity of the rain with respect to ...
Thursday, February 17, 2011 at 11:21am

physics
At what altitude above the Earth's surface would your weight be two-thirds of what it is at the Earth's surface? (Assume Re = 6.371 103 km.)
Thursday, February 17, 2011 at 10:21am

physics
An astronaut on the surface of Mars fires a cannon to launch an experiment package, which leaves the barrel moving horizontally. Assume that the free-fall acceleration on Mars is three eighths that on the Earth.(a) What must be the muzzle speed of the package so that it ...
Wednesday, February 16, 2011 at 9:11pm

Earth Science
need to find the mystery phrase made from the following letters DNALFOSSERGORPEGA
Wednesday, February 16, 2011 at 7:30pm

science
What would be the effect on satellites now in orbit if the earth stopped rotating
Wednesday, February 16, 2011 at 5:20pm

physics
A fisherman sets out upstream from Metaline Falls on the Pend Oreille River in northwestern Washington State. His small boat, powered by an outboard motor, travels at a constant speed v in still water. The water flows at a lower constant speed vw. He has traveled upstream for ...
Wednesday, February 16, 2011 at 12:36pm

physics
how much work is required to lift a 10 newton weight from 4.0 meters to 40.0 meters above the surface of earth
Tuesday, February 15, 2011 at 7:42pm

Physics circular motion
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a person situated (a) at ...
Tuesday, February 15, 2011 at 7:39pm

science
what keeps the moon traveling in the same path eah time it orbits earth
Monday, February 14, 2011 at 8:36pm

physics
A 3Kg projectile is fired straight upward from earth's surface with a speed that is one-fourth the escape speed. Neglecting air resistance. a) What is the Kinetic energy of this projectile when it is launched? b) what is the gravitational potential energy of this ...
Monday, February 14, 2011 at 7:47pm

Physics
A 360-kg satellite is in orbit around the Earth 10000 km above the Earth's surface. (a) What is the weight of the satellite when in orbit? [Answer is in N] (b) What was its weight when it was on the Earth's surface, before being launched? [Answer is in N] (c) While it ...
Monday, February 14, 2011 at 6:53pm

science
if you weigh 100 pounds on earth than how much would you weigh on each other planet in our solar system
Monday, February 14, 2011 at 3:27pm

world history
007679 1. A staple food transplanted from Southeast Asia to the Mediterranean world as a result of the Islamic Empire was A. wheat. B. rice. C. yams. D. potatoes. 2. How did Alfred the Great secure his modern reputation as a state-builder? A. He gave free land and tax breaks ...
Monday, February 14, 2011 at 2:21pm

physics??
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a person situated (a) at ...
Monday, February 14, 2011 at 12:35pm

earth science
describe a possible pathway of carbon through the four spheres of the earth.Identifty what each the fourspheres of the earth contains
Sunday, February 13, 2011 at 11:08pm

English
Is this sentence correct? I sat down with him and helped him with the layers of the earth worksheet. Or do I need to take out the before layers
Sunday, February 13, 2011 at 9:55pm

earth science
what makes scientists think that the ozone layer is disappearing?
Sunday, February 13, 2011 at 12:47pm

math
Venus begins a new year every 225 days. Earth begins a new year every 365 days. If both planets begin a new year on the same day, how many days will pass befor that happens again.
Sunday, February 13, 2011 at 8:49am

math
Venus begins a new year every 225 days. Earth begins a new year every 365 days. If both planets begin a new year on the same day, how many days will pass befor that happens again.
Saturday, February 12, 2011 at 11:35pm

physics
How much work is required to lift a 600-kg satellite to an altitude of 4 * 10^6 m above the surface of the earth? The gravitational force is F=GMm/r^2, where M is the mass of earth, m is the mass of the satellite, r is the distance between them. The radius of the earth is 6.4...
Friday, February 11, 2011 at 11:01pm

Physics
Engineers are trying to create artificial "gravity" in a ringshaped space station by spinning it like a centrifuge. The ring is 170 m in radius. How quickly must the space station turn in order to give the astronauts inside it apparent weights equal to their real ...
Friday, February 11, 2011 at 1:03pm

Physics
A spy satellite is in circular orbit around Earth. It makes one revolution in 6.05 hours. (Radius of the Earth=6.371 106 m) (a) How high above Earth's surface is the satellite? What is the satellite's acceleration
Friday, February 11, 2011 at 1:10am

physics
A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 81.0 m/s at ground level. Its engines then fire and it accelerates upward at 4.10 m/s2 until it reaches an altitude of 940 m. At that point its engines fail, and the rocket goes into ...
Thursday, February 10, 2011 at 11:10pm

A spacecraft is on a journey to the moon. At what point, as measured from the center of the earth, does the gravitational force exerted on the spacecraft by the earth balance that exerted by the moon? This point lies on a line between the centers of the earth and the moon. The...
Thursday, February 10, 2011 at 7:08pm

Physics
Suppose a straight 1.25 mm diameter copper wire could just "float" horizontally in air because of the force of the Earth's magnetic field B, which is horizontal, perpendicular to the wire, and of magnitude 5.00 multiplied by 10-5 T. What current would the wire ...
Thursday, February 10, 2011 at 6:42pm

physics
On a distant planet, golf is just as popular as it is on earth. A golfer tees off and drives the ball 3.7 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 44 m/s at an angle of 52° above the ...
Thursday, February 10, 2011 at 6:42pm

earth science
what are the six most abundant components (elements)dissolved in seawater? what is produced when the two most abundant elements are combined?
Thursday, February 10, 2011 at 6:04pm

physics
The masses of the earth and moon are 5.98x1024 and 7.35x1022 kg, respectively. Identical amounts of charge are placed on each body, such that the net force (gravitational plus electrical) on each is zero. What is the magnitude of the charge placed on each body?
Thursday, February 10, 2011 at 4:04pm

physics
An airplane with a speed of 94.9 m/s is climbing upward at an angle of 63.2 ° with respect to the horizontal. When the plane's altitude is 743 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
Thursday, February 10, 2011 at 1:07pm

physics
The earth exerts a downward force of 850 N on a veteran astronaut as he works outside the space shuttle. What force (if any) does the astronaut exert on the earth?
Thursday, February 10, 2011 at 11:26am

Science
Why do scientists use models to study the movement of Earth and its moon?
Wednesday, February 9, 2011 at 10:03pm

Africa
What is a deep trench in the earth
Wednesday, February 9, 2011 at 8:30pm

physics
How would your Mars weight compare to your earth weight if the acceleration due to gravity on Mars is 3.71 m/s2?
Wednesday, February 9, 2011 at 2:10pm

physics
The solar wind is a thin, hot gas given off by the sun. Charged particles in this gas enter the magnetic field of the earth and can experience a magnetic force. Suppose a charged particle traveling with a speed of 9.80 x 10^6 m/s encounters the earth's magnetic field at an...
Tuesday, February 8, 2011 at 7:24pm

physics
At New York City, the earth's magnetic field has a vertical component of 5.2 10-5 T that points downward (perpendicular to the ground) and a horizontal component of 1.8 x 10^-5 T that points toward geographic north (parallel to the ground). What is the magnitude and ...
Tuesday, February 8, 2011 at 7:23pm

AP European History
I have to write an essay answering the following questions: What is the relationship between the study of geography and the study of history? What are the advantages and disadvantages of Europe’s geography? Explain the impact of Europe’s geography on European History...
Tuesday, February 8, 2011 at 11:51am

fizik asas
The earth travels in a nearly circular orbit about the sun. The mean distance of the earth from the sin is 1.5¡Á1011 m. What is the approximation speed of the earth in its orbit around the sun?
Tuesday, February 8, 2011 at 7:39am

Obsolescence
Could I know what this means? Like I think it means no more existance or something, but how do I rephrase my awkwardy definition? What things are becoming obsolote? Home land line phones Cassettes Could You give me a link to where I can find what other things are becoming non ...
Monday, February 7, 2011 at 8:58pm

english
To no man does the earth mean so much as to the soldier. what type of rhetorical device does this sentece contain
Monday, February 7, 2011 at 8:00pm

science
how are resources brought up from the earth's surface?
Monday, February 7, 2011 at 7:55pm

Earth and Physical Science
A 901 kg car is traveling north down a country road when a deer crosses in front of the car. By slamming on the breaks, the care is able to decelerate at 4.0 meters per second squared. What is the frictional force between the street and the car?
Monday, February 7, 2011 at 7:52pm

earth
Geological time scale summary for stone mountain's granite in georgia, with: description of the Feature Description of Processes Influence of Time on Rock Formation Discussion of Transformation processes Hand Samples Location Types of Rock from map A Map History Age of ...
Monday, February 7, 2011 at 7:12pm

English
These are the sentences I'm not sure of. I included the doubts in parantheses.Thank you. 1) Briefly outline the main features of the epic poem. Refer then to the seventh-century (?) epic poem "Beowulf" and to what it celebrates. 2)In the song "Help" the...
Monday, February 7, 2011 at 4:46pm

AP European History
What is the relationship between the study of geography and the study of history? What are the advantages and disadvantages of Europe’s geography? Explain the impact of Europe’s geography on European History. This is what I have so far: How are geography and history ...
Monday, February 7, 2011 at 12:25pm

pre cal
assuming that Earth is a sphere of a radius 6378 kilometers, what is the difference in the latitudes of Lynchbug, Virginia, and Myrtle Beach, South Carolina, where Lynchbug is 400 kilometers due north of Myrtle Beach?
Sunday, February 6, 2011 at 11:52pm

Physics
A man observes snow falling vertically when he is at rest, but when he runs through the falling snow at a speed of 4.70 m/s, it appears to be falling at an angle of 24.0° relative to the vertical. Find the speed of the snow relative to the earth.
Sunday, February 6, 2011 at 9:46pm

Algebra
I've been looking for help on setting up this part of my homework so that I could finish it. If anyone can help, please do. Part 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...
Sunday, February 6, 2011 at 9:05pm

English
Can anybody help in evaluating this essay. i have to write an evaluation on it its by Wole Soyinka called Every Dictator's Nightmare With the blood-soaked banner of religious fanaticism billowing across the skies as one prominent legacy of this millennium, Martin Luther&#...
Sunday, February 6, 2011 at 7:12pm

English
I have to evaluate this essay.Can someone help me with this. how to evaluate this. some points on evaluating it. The essay is "Every dictator's Nightmare" by Wole Soyinka. thanks With the blood-soaked banner of religious fanaticism billowing across the skies as ...
Sunday, February 6, 2011 at 5:48pm

math
What's the minimum. length of the arc on the cicumference of the earth,where a curvature of the horizon is appearent? OR---What's the max.length of cord,drawn on the cicumference of the earth,where length of the cord appears same as arc? Follow up 2nd question---At ...
Sunday, February 6, 2011 at 11:44am

geometry
A satellite in a nearly circular orbit is 2000 km above Earth's surface. The radius of Earth is approximately 6400 km. If the satellite completes its orbit in 12 hours, calculate the speed of the satellite in kilometers per hour.(pay attention to the radius of the ...
Sunday, February 6, 2011 at 1:20am

Algebra
Solve the equation w=Cr^-2 for r. Is this right? w/C=r^-2 r=sqrt(C/w) And if so, I still seem to be having troubles answering the next part. 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 ...
Saturday, February 5, 2011 at 11:08pm

physics
A 2.40 m length of wire is held in an east-west direction and moves horizontally to the north with a speed of 14.9 m/s. The vertical component of Earth's magnetic field in this region is 40.0 µT directed downward. Calculate the induced emf between the ends of the ...
Saturday, February 5, 2011 at 2:21pm

Physics
A spy satellite is in circular orbit around Earth. It makes one revolution in 5.95 hours. (Radius of the Earth=6.371 106 m) (a) How high above Earth's surface is the satellite? (b) What is the satellite's acceleration?
Saturday, February 5, 2011 at 11:58am

physics
what sould be the angular speed with which the earth have to rotate on its axis so that a person on the equator would weight 3/5th as much as present..??
Saturday, February 5, 2011 at 12:38am

Physics
The mass of the Moon is 7.35 x 10^22 kg. At some point between Earth and the Moon, the force of Earth's gravitational attraction on an object is cancelled by the Moon's force of gravitational attraction. If the distance between Earth and the Moon (centre to centre) is ...
Friday, February 4, 2011 at 4:30pm

Physics
while on the moon, the Apollo astronauts enjoyed the effect of a gravity much smaller than that on earth. if Neil Armstrong jumped up on the moon with an initial speed of 1.51 m/s to a height of 0.700m, what amount of gravitational acceleration did he experience?
Thursday, February 3, 2011 at 10:45am

KUSSSESSS
Consider a wire of length L = 0.30 m that runs north-south on a horizontal surface. There is a current of I = 0.50 A flowing north in the wire. (The rest of the circuit, which actually delivers this current, is not shown.) The Earth's magnetic field at this location has a ...
Wednesday, February 2, 2011 at 11:53pm

Earth Science
Divide the following list of words into 2 categories: drumlin, kettle lake, mafic, devonian, asthenosphere, gradient, fossil, topography, plateau, marlble For each category, give it a title (1-2 sentences)
Wednesday, February 2, 2011 at 11:27pm

Science
I am doing a 3rd grade science project on the Sun. I have to create a "visual". I want to compare the size of the earth to the size of the sun. I found that you could put 1,000,000 earths inside the Sun. I would like to fill a container [representing the Sun] with ...
Wednesday, February 2, 2011 at 9:51pm

physics multiple choice
Far from any gravity, an astronaut accidentally releases a metal wrench inside a spaceship that is traveling at a constant velocity of 250 km/s away from earth in outer space. What will be the subsequent behavior of that wrench as observed by the astronaut? A. It will fall to ...
Wednesday, February 2, 2011 at 8:27pm

physics multiple choice
A 3.00 lb. physics book rests on an ordinary scale that is placed on a horizontal table. The reaction force to the downward 3.00 lb force on the book is A. an upward 3.00 lb force on the scale due to the table. B.an upward 3.00 lb force on the book due to the scale. C.an ...
Wednesday, February 2, 2011 at 8:23pm

earth
classify each of the folowing layers as liquid,rigid,or solid but able to flow slowly:lithosphere,asthenosphere,lower mantle,outer core,inner core.
Wednesday, February 2, 2011 at 6:57pm

Astronomy
Where do you have to be on Earth to see the south celestial pole at your zenith? What is the maximum possible elevation (angle) of the Sun above the horizon at that location? On what date is this maximum elevation achieved?
Wednesday, February 2, 2011 at 6:19pm

Physics
A plane is headed due west with an air speed of 221 m/s. The wind blows south at 37.5 m/s. Find the velocity of the plane relative to the earth. The question asks for the magnitude which I found is 224 m/s. The question also asks for the direction_____south of west. Can ...
Wednesday, February 2, 2011 at 4:49pm

physics multiple choice
Far from any gravity, an astronaut accidentally releases a metal wrench inside a spaceship that is traveling at a constant velocity of 250 km/s away from earth in outer space. What will be the subsequent behavior of that wrench as observed by the astronaut? A. It will fall to ...
Wednesday, February 2, 2011 at 4:43pm

physics multiple choice
A 3.00 lb. physics book rests on an ordinary scale that is placed on a horizontal table. The reaction force to the downward 3.00 lb force on the book is A. an upward 3.00 lb force on the scale due to the table. B.an upward 3.00 lb force on the book due to the scale. C.an ...
Wednesday, February 2, 2011 at 4:39pm

Astronomy
Where do you have to be on Earth to see the south celestial pole at your zenith? What is the maximum possible elevation (angle) of the Sun above the horizon at that location? On what date is this maximum elevation achieved?
Wednesday, February 2, 2011 at 4:01pm

Astronomy
Where do you have to be on the Earth to see the Sun at your zenith? If you stay at one such location for a full year, on how many days will the Sun pass through the zenith?
Wednesday, February 2, 2011 at 3:45pm

calculus
Write the standard form of the equation for the path of a communications satellite in a circular orbit 22,000 miles above Earth. (Assume that the radius of Earth is 4000 miles.)
Wednesday, February 2, 2011 at 11:35am

Physics
A helicopter is ascending vertically with a speed of 4.50 m/s. At a height of 65 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the helicopter's.]
Tuesday, February 1, 2011 at 8:30pm

PHYSICS
Is the weight of a body the same thing as its mass? Discuss briefly. Is the weight of a body constant at all places on the earth? is the mass?
Tuesday, February 1, 2011 at 12:54pm

math
an object that weighs 234lb on jupiter weighs 100lb on earth. what would an object that weighs 400 lb on jupiter weigh on earth?
Monday, January 31, 2011 at 10:11pm

Physics
Mars has a radius of about 0.53 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.
Monday, January 31, 2011 at 7:35pm

Physics
A 600-kg geosynchronous satellite has an orbital radious of 6.6 Earth radii. What gravitational force does Earth exert on the satellite?
Monday, January 31, 2011 at 7:32pm

physics
Moon is a natural satellite of the Earth, circling it with period (time of one revolution), T = 27,3 days. Radius of Moon’s orbit = 384,000 km. Find the acceleration of the Moon toward the Earth.
Monday, January 31, 2011 at 3:40pm

Physics
A train is moving 50km/h east. A person is walking 5 km/h west on the train. How fast is the person on the train going relative to an observer on the earth?
Monday, January 31, 2011 at 2:09am

Physics
The moon is 384,000 km from the earth and makes 1 revolution in 27.3 days. Find its angular and linear speeds in its orbit.
Monday, January 31, 2011 at 1:31am

science
If you Weighed 360 pounds on Earth with your space suit on, what would you weigh on the moon? Why?
Saturday, January 29, 2011 at 11:32pm

health physics
Assuming that at the beginning of time (big bang; creation of the universe) there were equal numbers of U-235 and U-238 atoms produced, estimate the age of the Earth (using terrestrial U-235 and U-238 abundances).
Saturday, January 29, 2011 at 4:03pm

physical science
A kg ball of lead rests next to a 10 kg rock. which statement below is true:a:the lead ball and rock have the same amount of inertia,b:if the lead ball and the rock fell from the same height in a vacuum, the rock would hit the ground first because it is less massive,c: on the ...
Saturday, January 29, 2011 at 2:13pm

science
The gravitational pull on Jupiter is 2.5 times greater than Earth's gravitational pull. If an object weighs 10 pounds on Earth, what will it weigh on Jupiter?
Friday, January 28, 2011 at 11:10am

earth
In an accidental explosion, a satellite breaks in half while while in a circular orbit about earth. One half is brought to momentarily to rest. What is the fate of the half brought to rest? What happens to the other half?
Friday, January 28, 2011 at 8:56am

algebra
The force of gravity is inversely proportional to the square of the center of the earth. if you weigh 120 lbs on the surface of the earth, how much would you weigh 250 miles above the surface? (Earth's radius = 4000 miles)
Thursday, January 27, 2011 at 8:50pm

Career Plans
Does this make sense? My Plan A is to do something with geology. I take deep interest in learning about Earth's structure and about the universe. Exploring and discovering solution connecting with earth would be very intersting. I would somewhat be able to contribute to ...
Thursday, January 27, 2011 at 7:33pm

science
how do hydrogen bonds relate to the transfer off heat from the equator towards the poles of earth
Thursday, January 27, 2011 at 8:24am

physics HELP
A 7450 kg satellite has an elliptical orbit, as in Figure 6.9b. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far...
Wednesday, January 26, 2011 at 5:23pm

Drwls[SCIENCE]
Asthenosphere can act like a viscous liquid right? Is lithosphere part of the crust, or just part of the mantle? The core is the most solid part within the earth right? P-waves can travel through all the layers, except for S-waves right? Also What really is the plate tectonic...
Wednesday, January 26, 2011 at 10:28am

physics
Astronauts on our moon must function with an acceleration due to gravity of 0.170g . A. If an astronaut can throw a certain wrench 14.0 { m} vertically upward on earth, how high could he throw it on our moon if he gives it the same starting speed in both places? B. How much ...
Wednesday, January 26, 2011 at 12:54am

Science
Asthenosphere can act like a viscous liquid right? Is lithosphere part of the crust, or just part of the mantle? The core is the most solid part within the earth right? P-waves can travel through all the layers, except for S-waves right? Also What really is the plate tectonic ...
Tuesday, January 25, 2011 at 10:35pm

physics
Star Z has 1/5 the radius of Earth and 1000 times the Earth's mass. If a mass weighs 1.0 N on Earth, what does it weight on Star Z?
Tuesday, January 25, 2011 at 10:09pm

physics
Star Z has 1/5 the radius of Earth and 1000 times the Earth's mass. If a mass weighs 1.0 N on Earth, what does it weight on Star Z?
Tuesday, January 25, 2011 at 10:09pm

physics
A body is dropped from a height of 10 meters on Earth and hits the ground with a certain velocity. The body is then taken to the moon, which has a gravitational constant that is 1/6th the value as compared to Earth. It is dropped from the same height, hitting the ground with a...
Tuesday, January 25, 2011 at 10:09pm

science
what material is earth and mars made of ?
Tuesday, January 25, 2011 at 9:15pm

science
If an object weights 40 N on the Earth, it would weigh only 10 N when its distance from the center of the earth doubles, halves, triples or quadruples??? How do I figure this?
Tuesday, January 25, 2011 at 8:09pm

physics
Star Z has 1/5 the radius of Earth and 1000 times the Earth's mass. If a mass weighs 1.0 N on Earth, what does it weight on Star Z? Thank you.
Tuesday, January 25, 2011 at 7:56pm

physics
person weighs 526 N on Earth. Another planet has twice the mass of Earth and Twice the radius of Earth. Find the weight on the other planet. I need help with a formula too.
Tuesday, January 25, 2011 at 7:42pm

science
object weighs 40 N on earth's surface. it would weight on 10 N when its distance from earth's center is doubled halved tripled or quadrupled thankyou
Tuesday, January 25, 2011 at 12:21am

science
object weighs 40 N on earth's surface. it would weight on 10 N when its distance from earth's center is doubled halved tripled or quadrupled thankyou
Tuesday, January 25, 2011 at 12:21am

science
an imaginary dense star Z has 1/5 the radius of earth, but 1000 times earth's mass. How much would a masss weighing 1.0 N on earth weigh on Star z
Tuesday, January 25, 2011 at 12:17am

physics
you weigh 526 N on earth. Planet X has twice the mass of Earth and twice the radius of Earth. What is your weight in newtons on planet X?
Tuesday, January 25, 2011 at 12:14am

math chem
Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere. Earth¡¯s oceans, because of their high heat capacity, can absorb heat and therefore act to slow down ...
Monday, January 24, 2011 at 11:36pm

chem/math
How much heat would be required to warm Earth¡¯s oceans by 1.0 ¡ãC? Assume that the volume of Earth¡¯s oceans is 137 x ¡¼10¡½^7 ¡¼km¡½^3 and that the density of sea water is 1.03 g/cm3. Also...
Monday, January 24, 2011 at 10:32pm

chem
Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere. Earth¡¯s oceans, because of their high heat capacity, can absorb heat and therefore act to slow down ...
Monday, January 24, 2011 at 7:27pm

science
an astronaut in space vehicle traveling from earth to the moon is in potential danger of being harmed by the sun's ultraviolet radiation.
Monday, January 24, 2011 at 6:13pm

science
if i am 11 how old will i be when the life that is leaving the star arcturus reach the earth and how far in kilometers will it have traveled
Monday, January 24, 2011 at 4:21pm

physics
Calculate the force of gravity on a 12 kg mass if it were 6.4 106 m above Earth's surface (that is, if it were 2 Earth radii from Earth's center.)
Monday, January 24, 2011 at 11:06am

physics
Calculate the force of gravity on a 12 kg mass if it were 6.4 106 m above Earth's surface (that is, if it were 2 Earth radii from Earth's center.)
Monday, January 24, 2011 at 11:05am

density and density error (check calculations)
Calculate the density of earth and its density error d=m/v where m = 6.00*10^24kg and v = (4/3)(pi)(6359000)^3 = 1.07709...*10^21 m^3 therefore d=6.00*10^24/1.07709...*10^21 m^3 d = 5570.5254...kg/m^3 using the sig fig rule, in division and multiplication take the least ...
Monday, January 24, 2011 at 9:55am

chemistry - density and error (check)
Monday, January 24, 2011 at 7:43am

Science
Sunday, January 23, 2011 at 5:23pm

physics
A person is standing at the edge of the water and looking out at the ocean (see the drawing). The height of the person’s eyes above the water is h=1.6 m, and the radius of the earth is R=6.38x10^6 m (use as a precise value). (1) How far is it to the horizon (in meters, ...
Sunday, January 23, 2011 at 2:53pm

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