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September 23, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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Physics
A pendulum has a period of 0.70 s on Earth. What is its period on a planet where the acceleration of gravity is about 0.31 that on Earth?
Monday, January 9, 2012 at 12:32am

science
What are 2 ways resources are brought up from under Earth's surface?
Saturday, January 7, 2012 at 6:37pm

Science
What are 3 ways resources are brought up from the earth's surface?
Saturday, January 7, 2012 at 2:09pm

re-post statistics
a weather girl predicts there is a 50% chance of rain and a 10% chance that the rain will turn into snow. What is the probability that it will snow? statistics - Ms. Sue, Friday, January 6, 2012 at 9:08pm What on earth is a "weather girl?" That's what the ...
Saturday, January 7, 2012 at 8:03am

physics
I will be thank full to u if u help me in solving the below problem If the change in the value of g at a height h above the surface of the earth is same as depth x below the surface of the earth, then (h<<R)
Friday, January 6, 2012 at 9:47pm

Physics
An object has a mass of 115 kg on the Earth. What is the weight of the object on the surface of a planet where the acceleration due to gravity is 5.6 m/s2?
Thursday, January 5, 2012 at 11:13pm

Science
Where is most of the freshwater on Earth? F. lakes G. glaciers H. rivers J. oceans
Thursday, January 5, 2012 at 6:39pm

physics
apollo astronaunts took a nine iron to the moon and hit a golf ball about 180 m ! Assuming that the swing, launch angle, and so on, were the same as on earth where the same astronaut could hit it only 35 m, estimate the acceleration due to gravity on the surface of the moon. (...
Thursday, January 5, 2012 at 4:46pm

earth
what different elements are used in photosynthesis?
Wednesday, January 4, 2012 at 7:34pm

geometry
Earth’s radius is about 4,000 mi. To the nearest mile, what is the distance a person can see on a clear day from an airplane 5 mi above Earth? help please!
Wednesday, January 4, 2012 at 5:49pm

english
3. Which one of the following statements is an example of a complex sentence? A. Sparrows at the bird feeder compete for seeds. B. Neap tide is the best time for digging clams. [C. The earth was spinning when Lucas first saw Lucille.] D. The crescent moon is a symbol of Islam.
Wednesday, January 4, 2012 at 3:10pm

Living environment
1.All of Earth's water, land, and atmosphere within which life exists is known as a population b. an ecosystem c.the biosphere d. a biotic community IS THE ANSWER C
Tuesday, January 3, 2012 at 5:05pm

English
What is the meaning of "When once you have tasted flight, you will forever walk the Earth with your eyes turned skyward, for there you have been, and there you will always long to return"?
Tuesday, January 3, 2012 at 2:08pm

physics
The earth's atmosphere extends to a height of nearby 200KM above its surface there many be explosion and noises taking place in the outer space but we do not hear them.why?
Tuesday, January 3, 2012 at 7:44am

Physics Repost
A at disk of material has the same mass as the Earth, 5.98E+24 kg, and has a radius of 6.25 E+07 m. Point A is located a distance of 5.8E+06 m above the center of the disk. Point B is located right at the center of the disk. Treat all of the mass as if it were located in the x...
Sunday, January 1, 2012 at 2:55pm

Physics
A at disk of material has the same mass as the Earth, 5.98E+24 kg, and has a radius of 6.25 E+07 m. Point A is located a distance of 5.8E+06 m above the center of the disk. Point B is located right at the center of the disk. Treat all of the mass as if it were located in the x...
Saturday, December 31, 2011 at 10:40am

english help in Revising
Hi I answered all my question for this lesson correct only 4 were incorrect I really need help correcting them Here is my work #6-What is the conflict in the story? Be sure to discuss all the conflicts. #6 – The first conflict was Jacks mother and jack vs the cow. The cow...
Saturday, December 31, 2011 at 6:41am

Geometry
A city has a scale model of the solar system nearly 6 km long. The model's scale is 1 km : 1 billion km. a. Earth is 150,000,000 km from the Sun. How many meters apart are Earth and the Sun in the model?
Friday, December 30, 2011 at 11:24pm

earth
A 5.0-kilogram sphere, starting from rest, falls freely 22 meters in 3.0 seconds near the surface of a planet. Compared to the acceleration due to gravity near Earth’s surface, the acceleration due to gravity near the surface of the planet is approximately
Thursday, December 29, 2011 at 4:24pm

Physics
The De-orbit Burn The Shuttle must reduce its velocity at a pre-calculated point in its orbit in order to return to Earth. In order to reduce the velocity and change the orbit of the Shuttle, a maneuver called the de-orbit burn is performed. For this maneuver, the Shuttle is ...
Wednesday, December 28, 2011 at 10:59pm

Physics
A star with the same mass and diameter as the sun rotates about a central axis with a period of about 29.2 days. Suppose that the sun runs out of nuclear fuel and collapses to form a white dwarf star with a diameter equal to that of the earth. Assume the star acts like a solid...
Friday, December 23, 2011 at 1:25pm

English
Please look over my answer. The first set of questions all refer to this poem: When in disgrace with fortune and men's eyes I all alone beweep my outcast state, And trouble deaf heaven with my bootless cries, And look upon myself, and curse my fate, Wishing me like to one ...
Wednesday, December 21, 2011 at 2:01pm

physics
the gravity that sun has on the moon is about 2 times more than the gravity from earth so why doesn't moon run away from earth to sun?
Wednesday, December 21, 2011 at 6:06am

earth
Determine the gravitational force that you exert on another person 1.90 m away. Assume that you and the other person are point masses of 75.0 kg each.
Monday, December 19, 2011 at 10:10pm

physics
A 80 kg man weighs 784 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 15% of his body weight?
Monday, December 19, 2011 at 6:31pm

earth
what factors contribute to the formation of fertile, deep topsoil in temperate regions?
Sunday, December 18, 2011 at 10:29pm

9th Grade Classes
I was reading my school district program of studies and I found this section in for high school coures. - English 9H - Integrated Algebra A - Earth Science - Global History and Geography I or H - French Beg. 1 - Orchestra (a days)/ Health (b days) - Studio Art I - African ...
Sunday, December 18, 2011 at 5:36pm

science
a person weighs 815 N on the earth, what is the persons weight on the moon?
Sunday, December 18, 2011 at 10:13am

kv khurda
an artificial satellite is orbiting the earth. A bomb is released from the satellite. The bomb will (a)explode due to the heat generated by the friction of air (b)fall freely on the earth (c)escape into outer space (d)orbit the earth along with the satellite
Saturday, December 17, 2011 at 1:10am

Physics
Starting from Newton’s law of universal gravitation, show how to find the speed of the moon in its orbit from the earth-moon distance of 3.9 × 108 m and the earth’s mass. Assume the orbit is a circle.
Friday, December 16, 2011 at 10:37am

Physics
Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth’s mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth
Friday, December 16, 2011 at 10:20am

PHI 103
After being told that she is being punished for lying, a child responds by telling her mother that she also lied. This response may involve which fallacy? Ad homimen (tu quoque) Ad verecundiam (ex libris) Ad misericordiam (ex ante) Ad baculum (antebellum) I am confused about ...
Thursday, December 15, 2011 at 9:37pm

physical science
Which one of these statements is true about Copernicus? a. His model included planetary orbits that were circular. b. He believed that Ptolemy's ideas about the shape of orbits were correct c. His model could not account for retrograde motion of Mars. d. His model of the ...
Thursday, December 15, 2011 at 8:59pm

physical science
The declination of the Sun on March 21 on Earth is
Thursday, December 15, 2011 at 8:53pm

physics
radius of the earth = 6.37 × 10^6 what is the speed of a 90.6 kg person at the equator? I know that F=m(v^2/r) but I don't know the force. Is there another equation that I'm missing or I'm using the wrong one? Thanks
Thursday, December 15, 2011 at 4:35pm

physics
An early major objection to the idea that Earth is spinning on its axis was that Earth would turn so fast at the equator that people would be thrown into space. Given : radius earth = 6.37 × 10^6 m , mass earth = 5.98 × 10^24 kg , radius moon = 1.74 × 10^6 m...
Thursday, December 15, 2011 at 4:26pm

Physics
Calculate the position of the center of mass of the following pairs of objects. Use a coordinate system where the origin is at the center of the more massive object. Give your answer not in meters but as a fraction of the radius as requested. Get data from inside the front ...
Thursday, December 15, 2011 at 3:53pm

physics
9. The surface of the earth is approximately 6,400 km from its center. If the mass of the earth is 6.0 x 1024 kg, what is the acceleration due to gravity near the surface?
Thursday, December 15, 2011 at 2:54am

Calculus
Assuming the earth is a perfect sphere of raius 3950 miles, find (in inches) d. d, is the difference between the arc and a straight line.
Wednesday, December 14, 2011 at 1:48pm

Physics
The Near Earth Asteroid Rendezvous (NEAR), after traveling 2.1 billion km, is meant to orbit the asteroid Eros at a height of about 15 km from the asteroid's center. Eros is roughly box-shaped, with dimensions 40 km 6 km 6 km. Assume Eros has a density (mass/volume) of ...
Tuesday, December 13, 2011 at 10:02pm

physics
The Near Earth Asteroid Rendezvous (NEAR), after traveling 2.1 billion km, is meant to orbit the asteroid Eros at a height of about 15 km from the asteroid's center. Eros is roughly box-shaped, with dimensions 40 km 6 km 6 km. Assume Eros has a density (mass/volume) of ...
Tuesday, December 13, 2011 at 6:36pm

physics
The Near Earth Asteroid Rendezvous (NEAR), after traveling 2.1 billion km, is meant to orbit the asteroid Eros at a height of about 15 km from the asteroid's center. Eros is roughly box-shaped, with dimensions 40 km 6 km 6 km. Assume Eros has a density (mass/volume) of ...
Tuesday, December 13, 2011 at 5:23pm

science
1. What was wrong or why do you think people rejected Wegner's idea of continental drift? 2. Explain why some partly molten lava rises toward Earth's surface.
Tuesday, December 13, 2011 at 4:12pm

Physics
At a certain location, the horizontal component of the earth's magnetic field is 2.3 x 10^-5 T, due north. A proton moves eastward with just the right speed, so that the magnetic force on it balances its weight. Find the speed of the proton.
Monday, December 12, 2011 at 6:41pm

algebra
a ball is thrown straight up into the air with an initial velocity of 128 ft/sec, the total amount of time in seconds that it takes the object to return to the earth can be calculated by using the quadratic, 128t-16t^2=0. Determine the "flight time," t, of the ball.
Monday, December 12, 2011 at 1:45pm

earth
Why does western North America have volcanoes, earthquakes, mountain ranges, and small valley glaceiers and why are these same features not present on the eastern part of the continent? How could this situation be reversed?
Sunday, December 11, 2011 at 9:16pm

trig
A satellite is in geostationary orbit 22,500 miles above the earth. IF the radius of the earth is 3,960 miles, how fast is the satellite moving in miles per day? How fast is the satellite moving in miles per hour?
Sunday, December 11, 2011 at 8:02pm

science
how do geologists know the earth is layered inside?
Sunday, December 11, 2011 at 2:58pm

science
which hemisphere of the earth contains the greater proportion of ocean surface?
Sunday, December 11, 2011 at 2:57pm

science
until recently, many scientists were tentative in their acceptance for the theory of the chemical evolution of life on earth. what has changed their minds?
Sunday, December 11, 2011 at 2:56pm

physics
A 2.5 kg mass weighs 23.75 N on the surface of a planet similar to Earth. The radius of this planet is roughly 7.7 × 10 6 m.Calculate the mass of of this planet. The value of the universal gravitational constant is 6.67259 × 10−11N · m2/kg2
Sunday, December 11, 2011 at 2:45pm

physics
A satellite moves in a circular orbit around the Earth at a speed of 5.8 km/s. Determine the satellite’s altitude above the surface of the Earth. Assume the Earth is a homogeneous sphere of radius 6370 km and mass 5.98 × 1024 kg. The value of the universal ...
Sunday, December 11, 2011 at 9:45am

physics
A 3.3 kg mass weighs 30.03 N on the surface of a planet similar to Earth. The radius of this planet is roughly 7.4 × 106 m. Calculate the mass of of this planet. The value of the universal gravitational constant is 6.67259 × 10−11 N · m2/kg2. Answer in...
Sunday, December 11, 2011 at 9:40am

physics
A satellite moves in a circular orbit around the Earth at a speed of 6.1 km/s. Determine the satellite’s altitude above the surface of the Earth. Assume the Earth is a homogeneous sphere of radius 6370 km and mass 5.98 × 10 24 kg. The value of the universal ...
Saturday, December 10, 2011 at 6:00pm

~~~~~College Algebra
Question: Various models have been used to make projections of growing populations. Thomas Malthus made one of the most famous conjectures of such a model in the early 19th century. Within Malthus’ claim was that the population of Earth would inevitably outstrip its means...
Saturday, December 10, 2011 at 5:58pm

physics
A 2.5 kg mass weighs 23.75 N on the surface of a planet similar to Earth. The radius of this planet is roughly 7.7 × 10^6 m. Calculate the mass of of this planet. The value of the universal gravitational constant is 6.67259 × 10^−11N · m2/kg2. Answer ...
Saturday, December 10, 2011 at 5:35pm

English
I urgently need you to revise this paragraph on dinosaurs. I need to simplify it using synonyms. 1) Whatever killed off (synonym??) the dinosaurs almost certainly had a bearing (I need a proper synonym) on the rest of the mass extinction, which was on a global scale and ...
Saturday, December 10, 2011 at 4:56pm

science
One kg weighs 9.8 N on Earth. Would it weigh more or less on the Moon?
Friday, December 9, 2011 at 9:34pm

physics
The mass of the Mars is about 0.11 the mass of the earth, its radius is 0.53 that of the earth, and the acceleration due to gravity at the earth's surface is 9.80 {\rm m}/{\rm s}^{2}.
Friday, December 9, 2011 at 7:01pm

Physics
A rocket leaves a launch pad at liftoff with a great deal of upward momentum. What was initially given downward momentum? a. the launch pad b. the astronauts aboard the rocket c. the expelled fuel d. the entire Earth
Friday, December 9, 2011 at 8:04am

Physics
What is the magnitude of the earth's gravitational field at sea level?
Thursday, December 8, 2011 at 9:24pm

Physics
Augustine continues to run around. He gets to the park and has the overwhelming urge to jump off a cliff and try to fly. He does so at an angle of 50 degrees to the horizontal while running at 14.5m/s. With his arms flapping, he rises in the air. a) what is the highest point ...
Thursday, December 8, 2011 at 7:15pm

Physics
Augustine continues to run around. He gets to the park and has the overwhelming urge to jump off a cliff and try to fly. He does so at an angle of 50 degrees to the horizontal while running at 14.5m/s. With his arms flapping, he rises in the air. a) what is the highest point ...
Thursday, December 8, 2011 at 6:58pm

Science
Which characteristic tells how the Earth and the moon are alike? A. Both have similar weath conditions B. Both rotate around the Sun C. Both receive light from the Sun D. Both are the same size I think its C
Thursday, December 8, 2011 at 4:36pm

physics
the mass of a body is 50 kg on the surface of the earth.find its weight on the surface of a planet whose mass is double than the mass of the earth and radius is 5 times the radius of the earth
Thursday, December 8, 2011 at 7:33am

Social Studies
There are 8 languages on he peace pole that all state "may pece prevail on earth" what languages are used? I need help on this plz help thank u
Tuesday, December 6, 2011 at 8:29pm

science
What is the magnitude of g at a height above Earth's surface where free fall acceleration equals 6.5m/s^2?
Tuesday, December 6, 2011 at 6:37pm

Living environment
in what period of earth time did the great increase in animal diveristy
Tuesday, December 6, 2011 at 5:55pm

geography
Approximately what percent of Earth’s species live in rainforests? A. 75% B. 25% C. 50% D. 90% i think its B
Monday, December 5, 2011 at 11:29am

Physics
Two satellites A and B of the same mass are orbiting Earth in concentric orbits. The distance of satellite B from Earth’s center is twice that of satellite A. What is the ratio of the tangential speed of B to that of A?
Monday, December 5, 2011 at 11:26am

earth
Rocks that become hot enough to melt and flow are referred to as ___ by scientists
Sunday, December 4, 2011 at 9:15pm

Physics
A 90 kg person stands on the ground before jumping vertically upward. If momentum is truly conserved in all closed isolated systems, then the Earth-person system should conserve momentum. If the person jumps with a speed of 3.5 m/s, what is resulting speed of the Earth in the ...
Sunday, December 4, 2011 at 6:35pm

Physics/Science
Why would someone using a Foucault Pendulum at the equator say that Earth does not rotate?
Sunday, December 4, 2011 at 4:02pm

English
I really need you to check these sentences. Thank you. 1) Shakespeare meditates whether time is preordained or not inevitable, the result of human activity. 2) The concept of the universe as a cosmic dance was derived (induced) from the new scientific discoveries, which ...
Saturday, December 3, 2011 at 10:04am

physics
A small airplane with a wingspan of 13.5 m is flying due north at a speed of 70.8 m/s over a region where the vertical component of the Earth's magnetic field is 1.20 µT downward. (a) What potential difference is developed between the airplane's wingtips? mV (b) ...
Friday, December 2, 2011 at 4:37pm

physical science
On the surface of the moon, where the acceleration due to gravity is about one-sixth that of Earth, a 100-kg astronaut would have a mass of_____ and a weight of _____ A. 100kg, 1000N B. 16.6kg, 166N C. 100kg, 166N D. 600kg, 1000N
Friday, December 2, 2011 at 3:55pm

physics
A spaceship of mass m travels from the Earth to the Moon along a line that passes through the center of the Earth and the center of the Moon. (a) At what distance from the center of the Earth is the force due to the Earth three times the magnitude of the force due to the Moon?
Friday, December 2, 2011 at 11:19am

Science
What is the gravity at the height of 15000 km above the earth surface
Friday, December 2, 2011 at 8:56am

sociology
From a functionalist perspective, how has human behavior and our way of life contributed to environmental problems? So far I have the premise that functionalist examine the entire system itself. Human activities have become a dominant influence on the earth's climate and ...
Friday, December 2, 2011 at 5:23am

Physics
A satellite moves in a circular orbit around the Earth at a speed of 6.3 km/s. Determine the satellite’s altitude above the surface of the Earth. Assume the Earth is a homogeneous sphere of radius 6370 km and mass 5.98 × 1024 kg. The value of the universal ...
Thursday, December 1, 2011 at 10:19pm

Science
How does Earth have seasons?
Thursday, December 1, 2011 at 8:15pm

physics
Help me with this problem i do not get it? A light wave can travel the earth to the moon in 1.3 s. the distance to the moon is 384,790 km. how long would it take a sound wave to travel the same distance at 343 m/s? state you answer in days. I got 2 days but i really think its ...
Thursday, December 1, 2011 at 6:44pm

sociology
From a functionalist perspective, how has human behavior and our way of life contributed to environmental problems? So far I have the premise that functionalist examine the entire system itself. Human activities have become a dominant influence on the earth's climate and ...
Thursday, December 1, 2011 at 5:59pm

astronomy/physics
Use Newton’s Law of Gravity to calculate the force of gravity between a 39 kg person and Earth.
Thursday, December 1, 2011 at 4:59pm

scientist
How could measuring the orbit of a comet help scientists understand when it will next be visible from earth
Thursday, December 1, 2011 at 4:46pm

Physics please help!
You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 2.070E+7 m and its rotation to be 19.8 hours. You have previously determined that the planet orbits 1.590E+11 m from its star with a period of 368.0 ...
Wednesday, November 30, 2011 at 10:49pm

physics
Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. a.) Calculate the speed of a 103-kg ...
Wednesday, November 30, 2011 at 8:36pm

Physics
Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. a.) Calculate the speed of a 103-kg ...
Wednesday, November 30, 2011 at 8:30pm

Earth Science
Which Scientific hypothesis for the Origin of Life on Earth is most widely accepted.? What evidence is there for the hypothesis? Need help. I'm just not how to go with the question.
Wednesday, November 30, 2011 at 4:52am

Physics
I can not figure this out. You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 2.070E+7 m and its rotation to be 19.8 hours. You have previously determined that the planet orbits 1.590E+11 m from its ...
Wednesday, November 30, 2011 at 2:03am

English
Which of the following publications are both listed under the "Magazines" results? A. Astronomy and Science B. Odyssey and Natural History C. Science News and Earth Island D. The Economist and American Scientist
Tuesday, November 29, 2011 at 1:52pm

Science
Does the Earth and moon have large molten core or only 1 of them does? I think the Earth only has large molten core
Monday, November 28, 2011 at 9:31pm

physics
(a) What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 129 km above Earth's surface? (b) What is the period of revolution? All right, I swear I have done everything and cannot figure this out!
Monday, November 28, 2011 at 7:01pm

Physics
Engineers are trying to create artificial "gravity" in a ring-shaped space station by spinning it like a centrifuge. The ring is 100m in radius. How quickly must the space station turn in order to give the astronauts inside it weights equal to their weights at the ...
Sunday, November 27, 2011 at 6:59pm

English
I forgot to include the following sentences. Thank you very much. 1)Ding believes that global warming comes from different parts of the world,including poorer countries. He claims that the only way to improve the situation is for rich and poor countries to work together. 2) (...
Sunday, November 27, 2011 at 4:21pm

Physics
Engineers are trying to create artificial "gravity" in a ring-shaped space station by spinning it like a centrifuge. The ring is 100m in radius. How quickly must the space station turn in order to give the astronauts inside it weights equal to their weights at the ...
Sunday, November 27, 2011 at 2:35pm

English
I urgently need to check the following statements concerning global warming. 1.I think it is important to protect our planet for the future generations. 2.We must respect the environment instead of polluting it. 3.I agree with Sophia that teenagers can change older people’...
Sunday, November 27, 2011 at 2:21pm

Physics
a) What will an object weigh on the Moon's surface if it weighs 500 N on Earth's surface? (b) How many Earth radii must this same object be from the center of Earth if it is to weigh the same as it does on the Moon? Alright, I know how to do part a. but I'm having ...
Sunday, November 27, 2011 at 12:41pm

Physics help please
You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 2.070E+7 m and its rotation to be 19.8 hours. You have previously determined that the planet orbits 1.590E+11 m from its star with a period of 368.0 ...
Sunday, November 27, 2011 at 12:50am

Earth science
what is the amount of force required to keep a 10kg ball moving in a constant direction at a constant velocity of 1 m/s ( ignore the effects of fricton
Saturday, November 26, 2011 at 11:40pm

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