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October 20, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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algerbra 2
3. Write the function R that models the total number of components that reenter the atmosphere around the earth each year.
Tuesday, December 18, 2012 at 8:32am

Earth Science to DAmon
Give positive and negative effects of climate change in Canada..
Monday, December 17, 2012 at 9:22am

EArth Science
Give positive and negative effects of climate change in Canada..
Monday, December 17, 2012 at 9:21am

social science
Read the speech below. It is a fictitious political speech by Peter, a candidate for the upcoming national election. Then answer the following questions: List all of the arguments in the speech List all of the non-arguments in the speech List all of the factual contents in the...
Monday, December 17, 2012 at 12:12am

Writing
Read the passage below. It is a fictitious political speech by Peter, a candidate for the upcoming national election. Then answer the following questions: 1. List the arguments 2. List the non-arguments 3. List the facts 4. List the non-facts 5. What statements are subjective...
Sunday, December 16, 2012 at 10:08pm

Physics
The weight of an object on Earth is 350 newtons. On Mars, the same object would weigh 134 newtons. What is the acceleration due to gravity on the surface of Mars, given that it is 9.8 meters/second2 on Earth?
Sunday, December 16, 2012 at 2:17pm

English
What is meant by the subthemes: death as pervading life, time as the essence of death and self destruction, night as the environment of death, and death as the great isolator as applied to Pablo Neruda's poems, especially Residence on Earth?
Sunday, December 16, 2012 at 12:29pm

EArth Science to DAMONpl
If sea level has risen by 20 cm over the past century on the coast of North America,by how much do you think it has risen over the past century on the coast of India?Explain.
Saturday, December 15, 2012 at 5:17pm

PLEASE HELP EARTH SCIENCE EMERGENCY!!!!
Describe two complexities about Earth's climate system that results in changes happening faster than expected.
Saturday, December 15, 2012 at 11:53am

algebra please help
The weight M of an object on Mars varies directly as its weighton earth. A person who weighs 95 lb on earth weighs 38 lbs on Mars. How much would a 100 lb person weigh on Mars?
Saturday, December 15, 2012 at 12:03am

Earth Science
Explain why the following statement is incorrect: Climatologists use the data from ice cores to directly measure past temperatures.
Friday, December 14, 2012 at 9:19pm

Earth Science
If sea level has risen by 20 cm over the past century on the coast of North America, by how much do you think it has risen over the past century on the coast of India? Explain.
Friday, December 14, 2012 at 9:07pm

physics
Radio waves of frequency 30 kHz are received at a location 1500 km from a transmitter. The radio reception temporarily “fades” due to destructive interference between the waves travelling parallel to the ground and the waves reflected from a layer (ionosphere) of the...
Friday, December 14, 2012 at 7:07pm

physics
How high does a rocket have to go above the Earth’s surface so that its weight is reduced to 33.7 % of its weight at the Earth’s surface? The radius of the Earth is 6380 km and the universal gravitational constant is 6.67 × 10 −11 N · m 2 /kg 2 . ...
Thursday, December 13, 2012 at 9:33pm

Earth Science
Computer models of Earth's climate project increases in the average temperature from 2°C to 6°C by the end of the century. Have these high temperatures ever occurred before in the past 400 000 years?
Thursday, December 13, 2012 at 7:55pm

physics
Imagine that a new asteroid is discovered in the solar system with a circular orbit and an orbital period of 7 years. What is the average distance of this object from the Sun in Earth units?
Thursday, December 13, 2012 at 2:30am

Physics
(a) Calculate the magnitude of the gravitational force exerted on a 430-kg satellite that is a distance of 2.81 times earth radii from the center of the earth. (b) What is the magnitude of the gravitational force exerted on the earth by the satellite? (c) Determine the ...
Wednesday, December 12, 2012 at 4:51pm

trigonometry
How do i do them? :l 7. At 2:00 P.M., the angle between the hour and minute hands on a clock is 60° (approximately 1.05 radians). The arc length formed by the two hands is 2.63 inches. What is the radius of the clock in inches? (Round to the nearest tenth.) 10. A pulley ...
Wednesday, December 12, 2012 at 10:10am

physics
calculate the value of g at a height of 3600 km above the surface of the earth?
Wednesday, December 12, 2012 at 12:39am

Physics
Compute: a. The velocity of an object orbiting at height of 2 Re above the surface of Earth. b. Compute the orbital period of that object.
Monday, December 10, 2012 at 9:29pm

Physics
How do you find the ratio of the new/ old world periods of a pendulum if the pendulum wee transported from earth to the moon, where the acceleration due to gravity is 1.63m/s^2? Im not sure if we use 9.8 at all, I think I'm supposed to use T=2 pi sqrtL/g.
Monday, December 10, 2012 at 12:47am

Physics
An object of mass .550kg is lifted from the floor to a height of 3.5m at a constant speed. How much work is done by the lifting force (include units)? b.) How much work is done by the Earth on the object? c.) What is the net work done on the object? d.) What is the change in ...
Sunday, December 9, 2012 at 8:28pm

physics- TEST TMRW PLS HELP!
Why is the following situation impossible? A librarian lifts a book from the ground to a high shelf, doing 20.0 J of work in the lifting process. As he turns his back, the book falls off the shelf back to the ground. The gravitational force from the Earth on the book does 20.0...
Sunday, December 9, 2012 at 8:45am

SCIENCE
AT WHAT HEIGHT ABOVE THE EARTH'S SURFACE DOES THE ACCELERATION DUE TO GRAVITY FALL TO 1% OF ITS VALUE AT THE EARTH SURFACE
Sunday, December 9, 2012 at 2:16am

physics- please explain
Why is the following situation impossible? A librarian lifts a book from the ground to a high shelf, doing 20.0 J of work in the lifting process. As he turns his back, the book falls off the shelf back to the ground. The gravitational force from the Earth on the book does 20.0...
Saturday, December 8, 2012 at 3:09pm

Science
If the earth's rotation slowed down, how would that affect the winds in the US?
Friday, December 7, 2012 at 4:28pm

Physics
How far is the center of mass of the Earth-Moon system from the center of the Earth? The Earth's mass is 5.97e24 Kg, the Moon's mass is 7.4e22 Kg, and the distance between their centers is 3.8e8m.
Friday, December 7, 2012 at 12:35pm

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 94-kg ...
Thursday, December 6, 2012 at 3:34pm

algebra
the formula d=(square root)12,800+h^2 gives the distance d in kilometers to the horizon from a satellite h kilometers above Earth.Find the distance to the horizon to the horizon from a satellite 4200 km above Earth. Round to the nearest kilometer. PLEASE HELP ME
Thursday, December 6, 2012 at 12:05am

BAA App. Essay Help! (please read!)
One of my personal achievements has to do with artistic. When I was in the 7th grade I participate in the 2012 Reflections Competition. The theme was "Diversity Means...". I decided to do visual arts. In my art work, I drew a huge earth and on top of the earth I drew...
Wednesday, December 5, 2012 at 9:03pm

reading
Why do you think the earth's crust is thicker under land than under bodies of water?
Wednesday, December 5, 2012 at 7:22pm

physics
Sally has a mass of 58.0 kg and Earth has a mass of 5.98 1024 kg. The radius of Earth is 6.371 106 m. What is the force of gravitational attraction between Sally and Earth? What is Sally's weight?
Wednesday, December 5, 2012 at 6:50pm

Math 8th Grade Please help
The radius of Earth is 6,371 kilometers. A space shuttle orbits 315 kilometers above the surface of Earth. The space shuttle completes 240° of a revolution around Earth in one hour. What is the average speed of the space shuttle? Choose the closest answer. Please help both...
Wednesday, December 5, 2012 at 4:59pm

science
at what altitide(height above earth's surface) would temperatures be 22 degrees C?
Wednesday, December 5, 2012 at 9:58am

dynamics of rigid bodies
prove that the weight of an object on the moon is approximately one-sixth of its weight on earth
Tuesday, December 4, 2012 at 8:51pm

PHYSICS URGENT! PLEASE FRICTION CASE 2
A 13 kg box is at rest on a level floor. The coefficient of static friction µS = 0.9 and the coefficient of kinetic friction µK = 0.8. Audrey is applying a 140 N push at an angle (=20°) as shown in Figure 1. C) What is the magnitude of FNormal on box from Earth?
Tuesday, December 4, 2012 at 7:14pm

physics
A long, straight wire lies on a horizontal table and carries a current of 3.05 µA. In a vacuum, a proton moves parallel to the wire (opposite the current) with a constant speed of 3.00 104 m/s at a distance d above the wire. Ignoring the magnetic field due to the Earth, ...
Tuesday, December 4, 2012 at 5:01pm

Social Studies
What percentage of the world's earthquakes and active volcanoes occur on the "Ring of Fire"? 1) *10% 2) *20% 3) *50% 4) *80% My Answer. Is It Correct? Please Be Honest. #4: 80% The name of Earth's single, huge continent from over 250 million years ago is 1) *...
Tuesday, December 4, 2012 at 4:40pm

social studies
Despite temperatures of more than 5,000º F, Earth's inner core is solid because of _____________________. a layer of ice just above it. the fact that Earth rotates so quickly. a thickness of over 1,000 miles. great pressure from the layers around it.
Tuesday, December 4, 2012 at 4:32pm

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 94-kg ...
Monday, December 3, 2012 at 9:42pm

7th grade Social Studies Ms. Sue
1. Which climate region dominates most of Northern Africa? (1 point) humid continental highland tundra arid 2. What kind of storm covers the largest area? (1 point) rainstorm blizzard hurricane tornado 3. Earth’s climate is affected by latitude, landforms, and a ...
Monday, December 3, 2012 at 8:06pm

Trigonometry
A satellite orbiting the earth in a circular path stays at a constant altitude of 100 kilometers throughout its orbit. Given that the radius of the earth is 6370 kilometers, find the distance that the satellite travels in completing 70% of one complete orbit.
Monday, December 3, 2012 at 7:03pm

Check my answers
1. The division of Earth’s history into smaller units makes up the ____. eras geologic time scale*** periods sequence of events 2. Today, some scientists think that ____. birds evolved from dinosaurs dinosaurs evolved from fish birds evolved from amphibians both a and b...
Monday, December 3, 2012 at 3:11pm

social studies
Multiple Choice 1. While Earth's orbit around the sun takes roughly 365 days, a single rotation of Earth takes about 8 hours. 24 hours. 1 month. 12 months. 2. During the summer solstice in the United States, the ______ _______ is tilted farthest toward the sun. Northern ...
Monday, December 3, 2012 at 2:51pm

maths
A well of diameter 7cm is dug 22.5m deep.The earth taken out it is spread evently all around it to a width of 10.5 to from an embankment .find the height of the embankment.
Monday, December 3, 2012 at 8:53am

physics
. The space shuttle typically orbits 400 km above the earth's surface. The earth has a mass of 5.98 × 1024 kg and a radius of 6,380 km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttle's cargo bay? ...
Monday, December 3, 2012 at 1:30am

Physics
Use 5.98 × 10 24 kg as the mass of the Earth. A 2350 kg meteorite has a speed of 143 m/s just before colliding head-on with the Earth. Determine the recoil speed of the Earth. Answer in units of m/s
Sunday, December 2, 2012 at 10:42pm

Science
Express mass of the Earth in unit of M. Take ME = 6 x 1024kg.
Sunday, December 2, 2012 at 8:37pm

Science
Express mass of the Earth in unit of M. Take ME = 6 x 1024kg. The apparent magnitude of the sun is £¡ 26.81 and that of another star is£¡1.81. How much brighter the sun is with respect to that star ?
Sunday, December 2, 2012 at 8:28pm

Physics [No Math]
When calculating weights away from Earth's surface, for example: At 6.38x10^3 km away from Earth's surface a spacecrafts weight is d=rE+rE Then F=(1/4)(SpaceCraftWeight) Why is the distance 2rE?
Sunday, December 2, 2012 at 6:44pm

Physics
A spy satellite orbiting at 160 km above Earth's surface has a lens with a focal length of 3.6 m and can resolve objects on the ground as small as 30 cm. For example, it can easily measure the size of an aircraft's air intake port. What is the effective diameter of the...
Sunday, December 2, 2012 at 4:40pm

wireless communications
what is the period of the space shuttle traveling at 250km above the earth and what is its velocity
Sunday, December 2, 2012 at 4:36pm

Physics
A 83.5 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 35.5 m behind the ship, at rest relative to the spaceship. The only way to return to the...
Sunday, December 2, 2012 at 2:19am

physics
An object is projected upward from the surface of the earth with an initial speed of 2 km/s. The acceleration of gravity is 9.81 m/s^2. Find the maximum height it reaches. Answer in units of km.
Friday, November 30, 2012 at 5:34pm

physics
A projectile is shot straight up from the earth's surface at a speed of 1.50×104 .
Friday, November 30, 2012 at 12:59am

Physics, Please Help
A 2130-kg space station orbits Earth at an altitude of 455 km. Find the magnitude of the force with which the space station attracts Earth. The mass and mean radius of Earth are 5.98 × 1024 kg and 6370 km, respectively.
Thursday, November 29, 2012 at 10:56pm

7th grade social studies Ms. Sue please
1. While Earth's orbit around the sun takes roughly 365 days, a single rotation of Earth takes about (1 point) 8 hours. 24 hours. 1 month. 12 months. 2. During the summer solstice in the United States, the ______ _______ is tilted farthest toward the sun. (1 point) ...
Thursday, November 29, 2012 at 6:44pm

earth
i have an acrostic poem i have to do for school on describing warm and cold fronts, but i can't think of some of the words
Thursday, November 29, 2012 at 5:45pm

Physics
Suppose a meteor of mass 3.30 1013 kg is moving at 32.0 km/s relative to the center of the Earth and strikes the Earth. Suppose the meteor creates the maximum possible decrease in the angular speed of the Earth by moving toward the west and striking a point on the equator ...
Thursday, November 29, 2012 at 4:21pm

earth science
what would be the chart to use for carbon 14 whcih has a half life of 5730 years and a piece of wood which originally has 12 grams pf radioactive isotope; If the half lives occurred and now has 0.75 grams left?
Thursday, November 29, 2012 at 3:46pm

earth science
if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days
Thursday, November 29, 2012 at 3:43pm

earth science
if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days
Thursday, November 29, 2012 at 3:43pm

earth science
if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days
Thursday, November 29, 2012 at 3:43pm

science
What does it mean to be a successful organism? Is bacteria the most successful organisms on earth?
Thursday, November 29, 2012 at 1:56pm

Physics
Two different simple harmonic oscillators have the same natural frequency (f=5.60 Hz) when they are on the surface of the Earth. The first oscillator is a pendulum, the second is a vertical spring and mass. If both systems are moved to the surface of the moon (g=1.67 m/s2), ...
Wednesday, November 28, 2012 at 11:59pm

Physics
An aluminum wire with mass/unit length of p = 5*10^-4 kg/m lies on the ground, running east-west. The wire feels the earth's magnetic field, which has magnitude B = 5*10^-5 T. Assume the wire is in Columbia, where the Earth's magnetic field runs due north, parallel to ...
Wednesday, November 28, 2012 at 7:59pm

Physics
A satellite is orbiting the earth at a distance of 1.00 x 10^3 km. What is its speed?
Wednesday, November 28, 2012 at 7:18pm

earth space
What man made or natural features can interfere with the weather radar?
Wednesday, November 28, 2012 at 5:10pm

earth
Hello.. Which four gases did the earth`s atmosphere coantain in the first billion years?
Wednesday, November 28, 2012 at 12:57pm

physics
i cant solve this problem i need for help please through how many does a point on the earth's surface move in 6h as a result of the earth's rotation ? what is the speed of a point on the equator ? take the radian of the earth to be 6370 km thank you
Wednesday, November 28, 2012 at 9:22am

physics
i cant solve this problem i need for help please through how many does a point on the earth's surface move in 6h as a result of the earth's rotation ? what is the speed of a point on the equator ? take the radian of the earth to be 6370 km thank you
Wednesday, November 28, 2012 at 9:20am

College Physics
A satellite in an elliptical orbit has a speed of 9.00km/s when it is at its closes approach to the Earth(perigee). The satellite is 7.00x10^6 m from the center of the Earth at this time. When the satellite is at its greatest distance from the center of the Earth (apogee), its...
Tuesday, November 27, 2012 at 10:51pm

College Physics
A satellite in an elliptical orbit has a speed of 9.00km/s when it is at its closes approach to the Earth(perigee). The satellite is 7.00x10^6 m from the center of the Earth at this time. When the satellite is at its greatest distance from the center of the Earth (apogee), its...
Tuesday, November 27, 2012 at 8:50pm

College Physics
Suppose a planet is discovered that has the same total mass as the Earth, but half its radius. Calculate the acceleration due to gravity on the surface of this planet.
Tuesday, November 27, 2012 at 7:28pm

Physics
A satellite in an elliptical orbit has a speed of 9.00km/s when it is at its closes approach to the Earth(perigee). The satellite is 7.00x10^6 m from the center of the Earth at this time. When the satellite is at its greatest distance from the center of the Earth (apogee), its...
Tuesday, November 27, 2012 at 7:25pm

physics
An astronaut throws a wrench in interstellar space. How much force is required to keep the wrench moving continuously with constant velocity? Select one of the options below as your answer: A. a force equal to its weight on Earth B. a force equal to zero C. a force equal to ...
Tuesday, November 27, 2012 at 10:08am

Physics Please Help ASAP
Suppose the space shuttle is in orbit 390 km from the Earth's surface, and circles the Earth about once every 92.4 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g, the gravitational acceleration at the Earth&#...
Monday, November 26, 2012 at 11:43pm

Physics ASAP
Suppose the space shuttle is in orbit 390 km from the Earth's surface, and circles the Earth about once every 92.4 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g, the gravitational acceleration at the Earth&#...
Monday, November 26, 2012 at 10:47pm

physics
A pendulum has a period of 0.9 s period on Earth. An object is suspended from a spring with force constant 9.8 N/m. (d)Find the mass suspended from this spring that would result in a period of 0.9 s on Earth
Monday, November 26, 2012 at 5:26pm

physics
What length of pendulum has a period of 0.9 s on Earth?
Monday, November 26, 2012 at 5:06pm

physics
What length of pendulum has a period of 0.9 s on Earth?
Monday, November 26, 2012 at 4:37pm

Physics
The surface of the Sun is approximately 5,650 K, and the temperature of the Earth's surface is approximately 295 K. What entropy change occurs when 6,000 J of energy is transferred by heat from the Sun to the Earth? (J/K)
Monday, November 26, 2012 at 4:29pm

Physics
The surface of the Sun is approximately 5,650 K, and the temperature of the Earth's surface is approximately 295 K. What entropy change occurs when 6,000 J of energy is transferred by heat from the Sun to the Earth? ______J/K
Monday, November 26, 2012 at 3:55pm

Earth Science
Develop a presentation on two ways technology has built on scientific knowledge?
Sunday, November 25, 2012 at 3:43am

Physics
A block with mass m = 2.00 kg is placed against a spring on a frictionless incline with angle θ=30.0° (see figure). The block is NOT attached to the spring. The spring, with spring constant k = 19.6 N/cm, is compressed 20.0 cm from its unloaded equilibrium length and ...
Friday, November 23, 2012 at 9:57pm

Physics HELP!!
Earthquakes are essentially sound waves travelling through the earth. They are called seismic waves. Because the earth is solid, it can support both longitudinal and transverse sismic waves, which travel at different speeds. The speed of longitudinal waves, called P waves, is ...
Wednesday, November 21, 2012 at 11:39am

7th grade social studies
In the Earth's Sourthern Hemisphere, what season begins in March? Spring Summer Fall Winter
Tuesday, November 20, 2012 at 6:09pm

EARTH SCIENCE
You are given a 6-month assignment by your employer to work at a remote location in Australia. In order to pack as lightly as possible, you try to research the climate of a small town in Australia. There is little data since no major cities are located within 300 miles of the ...
Monday, November 19, 2012 at 11:36pm

Earth-Space Science
what factors might affect the length of the rays after an impact?
Monday, November 19, 2012 at 10:17pm

trouble
Unlike elementary school, Elvis wasn't popular in high school. He didn't fit in well with the other kids, half due to his weird fashion style, and partly because of his shyness. In his senior year, his high school held a talent show which he entered not knowing what to...
Monday, November 19, 2012 at 9:44pm

Physics
For which of the following situations can the equation F = mg not be used to calculate the force due to gravity? a) The pull of gravity on an apple on the surface of the Earth. b) The pull of gravity on an airplane flying at an altitude of 8 km above the surface of the Earth. ...
Monday, November 19, 2012 at 4:08pm

English-Grammar
The underlined words (I put them in parantheses) are an example of a(n) ___________. (When the earth, moon, and sun are in line), an eclipse occurs. A. adverbial clause B. adjectival clause C. noun clause My answer is C.
Monday, November 19, 2012 at 1:04pm

Physics
The surface of the Sun is approximately 5700 K and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 1000 J of heat of energy is transferred from the Sun to the Earth?
Monday, November 19, 2012 at 12:18pm

Physics
A 50-kg satellite circles the Earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min? (Earth: radius = 6.4  106 m, mass = 6.0  1024 kg)
Sunday, November 18, 2012 at 11:42pm

Physics ASAP
Use the following numbers for this question. MEarth 5.98e+24 kg MJupiter 1.9e+27 kg MSun 2e+30 kg Earth-Sun distance 150000000000 m Jupiter-Sun distance 778000000000 m rE 6380000 m rJ 69000000 m G = 6.67e-11 Nm2kg-2 the acceleration due to gravity at the surface of Jupiter has...
Sunday, November 18, 2012 at 11:22pm

Physics
Use the following numbers for this question. MEarth 5.98e+24 kg MJupiter 1.9e+27 kg MSun 2e+30 kg Earth-Sun distance 150000000000 m Jupiter-Sun distance 778000000000 m rE 6380000 m rJ 69000000 m G = 6.67e-11 Nm2kg-2 the acceleration due to gravity at the surface of Jupiter has...
Sunday, November 18, 2012 at 10:44pm

Physics
The density of the Earth, at any distance r from its center, is approximately (14.2-11.6(r/R)*10^3) Kg/m^3, where R is the radius of the Earth. Show that this density leads to a moment of inertia I = 0.330MR2 about an axis through the center, where M is the mass of the Earth. ...
Sunday, November 18, 2012 at 2:23pm

math
if an object on earth is projected upward with an initial velocity of 32 feetper second, then its height after t seconds in given by h(t)=32t-16t^2
Sunday, November 18, 2012 at 2:22pm

Math Grade 12
So the question is basically asking which mountains peaks can be seen from Oahu. Island Distance(Mi) Mountain Height(ft) Lanai - 65 - Lanaihale - 3,370 Maui - 110 - Haleakala - 10,023 Hawaii - 190 - Mauna Kea - 13,796 Molokai - 40 - Kamakou - 4,961 A) Radius of earth= 3960 mi...
Sunday, November 18, 2012 at 1:11pm

Physics
Evaluate the following as true or false. If the Earth shrank in size, but all other factors remained the same, all of its satellites, including the Moon, would fly off into space. a) True b) False
Sunday, November 18, 2012 at 9:53am

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