Wednesday
January 28, 2015

Homework Help: Science: Earth

Recent Homework Questions About Earth

Post a New Question | Current Questions

Earth Science
Describe how weathering and erosion can be both destructive or constructive. I am still confused on the difference of erosion and weathering...
Tuesday, January 27, 2015 at 9:52pm

Math
Needing help setting these problems up...not necesarily giving me the answers. thanks. In January 2009 the state of Nevada was facing a budget deficit of $1.5 billion. The population of the state was approximately 2 million. How much would each person in the state have to ...
Tuesday, January 27, 2015 at 2:41pm

Physics
What is the Earth's gravitational force on you when you are standing on the Earth and when you are riding in the Space Shuttle 380 km above the Earth's surface? Answer as a fraction of the surface gravity of Earth. (The Earth's radius is 6400 km.)
Tuesday, January 27, 2015 at 1:55pm

science
which one of earth's layers has the hottest temperature? why?
Monday, January 26, 2015 at 7:46pm

science
what is the weight on earth of an object that has a mass of 17kg?
Monday, January 26, 2015 at 5:25pm

physics
A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.
Monday, January 26, 2015 at 12:07pm

Physics
A 83.8 kg astronaut is working on the en- gines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several sec- onds later is 39.6 m behind the ship, at rest relative to the spaceship. The only way to re- turn ...
Sunday, January 25, 2015 at 11:45pm

physics
You're heading an international effort to save Earth from an asteroid heading toward us at 11km/s . Your team mounts a rocket on the asteroid and fires it for 10 min, after which the asteroid is moving at 21km/s at 32∘ to its original path. In a news conference, what...
Sunday, January 25, 2015 at 6:36pm

physics
An 94.4 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 29.6 m behind the ship, at rest relative to the spaceship. The only way to return to ...
Sunday, January 25, 2015 at 12:01pm

english check
Treat the Earth and all that dwell thereon with respect. Remain close to the Great Spirit. Show great respect for your fellow beings. Work together for the benefit of all Mankind. Give assistance and kindness wherever needed. Do what you know to be right. Look after the well ...
Friday, January 23, 2015 at 6:40pm

earth
The radius of the Earth is approximately 3,960 miles. Find the approximate surface-area-to-volume ratio of the Earth.
Friday, January 23, 2015 at 2:46pm

Science
1)What is the Theory of Plate Tectonics? 2)What physical features are caused by plate tectonics? 3)What causes Earth's plates to move continuously?
Friday, January 23, 2015 at 2:17pm

english
Treat the Earth and all that dwell thereon with respect. Remain close to the Great Spirit. Show great respect for your fellow beings. Work together for the benefit of all Mankind. Give assistance and kindness wherever needed. Do what you know to be right. Look after the well ...
Friday, January 23, 2015 at 12:35pm

Orbital Mechanics
Some help with this exercise please. If you could give an explanation and not only the answers it would be great!!! Besides the 3-2-1 rotation sequence, another very common sequence in spacecraft applications is the 3-1-3 rotation sequence in which the z axis is used twice. ...
Friday, January 23, 2015 at 10:58am

physics
A canoe has a velocity of 0.31m/s southeast relative to the earth. The canoe is on a river that is flowing
Thursday, January 22, 2015 at 1:02am

Triangles
How will you find the distance of a star from Sun, given that the angle at which it is viewed from the two solstices of Earth(i.e winter and summer) are alpha and beta respectively, and the distance between the points of the solstices is 150 million km. {Hint - form a triangle...
Thursday, January 22, 2015 at 12:16am

Science
How does radioactivity make it possible to understand how Earth can be so old and still have a hot interior? (1 point) A.Radioactive elements trap heat from underground magma chambers. B.Radioactive elements absorb heat from the atmosphere and release it underground.*** C....
Wednesday, January 21, 2015 at 4:06pm

True or False?
Sounds like an easy question but I just wanna be sure! :P Tides are caused by the force of inertia from the sun and moon acting on Earth. True or False? I think its false because its gravity not inertia.
Monday, January 19, 2015 at 9:30pm

Earth Science
4.   Which statement best describes an igneous intrusion?       A. Magma is injected into surrounding rock forming an igneous intrusion.  B. Magma explodes to the surface and forms a smooth outer layer of rock.&...
Monday, January 19, 2015 at 8:51pm

Earth Science
1.   What measurement best describes the results of a scientific experiment regarding distance?  A. 57 miles B. 500 kilograms C. 523 inches D. 51 kilometers     ​ My answer is D. Am I correct?  &...
Monday, January 19, 2015 at 6:49pm

Earth Science - Please Check My Answer
Please help me with the following question: Please select the word from the list that best fits the definition Creates clouds, snow, sleet, rain and hail A. Radiation B. Conduction C. Convection D. Water Cycle I think the answer is mostly B, but I think it could be D as well. ...
Monday, January 19, 2015 at 6:34pm

Arithmetic
The Gardiner dam located 100 km south of Saskatoon is largest earth filled dam in the world. Upon it's opening in 1967, engineers discovered that the pressure from lake deifenbaker had moved the clay based structure 200 cm downstream. Since then, then the dam has been ...
Sunday, January 18, 2015 at 9:50pm

Physics
The earth has about 80 times the mass of the earth’s moon. The gravitational force exerted on the moon by the earth has what relation to the gravitational force exerted on the earth by the moon? 1. the same as 2. zero; the earth exerts a force on the moon,but the moon is ...
Sunday, January 18, 2015 at 4:27pm

Science
Please help me to solve this equation. Than you for your time and efforts. Here is the question? Jupiter at its closest approach to earth is about 630,000,000 kilometers, the diameter of Jupiter is 140,000 km, calculate the angular diameter of Jupiter in arc seconds. 206,265 ...
Saturday, January 17, 2015 at 4:24pm

Geometry
find the distance between the cities. Assume that Earth is a sphere of radius 4000 miles and that the cities are on the same longitude (one city is due north of the other) Dallas, Texas Latitude: 32* 47' 39" Omaha, Nebraska Latitude: 41* 15' 50"
Saturday, January 17, 2015 at 3:20pm

speed
2 rockets are launched. The first one travels 9000 mph. 15 Minutes later the second launched at 10000 mph. What is the distance at wich both rockets are an equal distance from earth?
Friday, January 16, 2015 at 9:30pm

Science
The rock cycle suggests that A)rocks are always added to Earth's mass. B)rocks are continuously being recycled into different forms. C)rocks disappear from Earth as they go underground. D)rocks always stay in the same form. My answer is A... is that right??
Friday, January 16, 2015 at 3:20pm

Math
Can someone please help me set this up. I didn't quite understand how to do this today. Before leaving Earth, the mass of an astronaut is measured to be 60kg. The astronaut lands on the Moon and measures the acceleration of gravity to be 1.6 m/s2(squared). What would the ...
Thursday, January 15, 2015 at 9:46pm

Science Ms. Sue?
Why did the following change occur? The snow that covered the ground all winter began to melt, temperatures rose, and flowers started to bloom. A. days became shorter B. the Earth tilted away from the sun C. the sun's rays became more concentrated D. Earth completed one ...
Thursday, January 15, 2015 at 2:07am

physics
Calculate the force of gravity between Earth (mass = 6.0 * 1024 kg ) and the moon (mass = 7.4 * 1022 kg) the average earth-moon distance is 3.8 * x10^8 m
Wednesday, January 14, 2015 at 11:56pm

math
At a given time, Saturn was 9.1 x 10 to the 8th miles from the sun and the earth was 9.3 x 10 to the 7th miles from the sun. by what distance is one planet closer to the sun than the other planets?
Wednesday, January 14, 2015 at 8:17pm

math
4 PART Your weight on different planets is affected by gravity. An object that weighs 150 pounds on Earth weighs only 56.55 pounds on Mars. The same object weighs only 24.9 pounds on the Moon. A)What percent of an object's Earth weight is its weight on Mars and on the Moon...
Wednesday, January 14, 2015 at 5:00pm

astronomy
a light year is a unit of distance most comparable to the distance from earth to what? nearest galaxy nearest star outer solar system
Wednesday, January 14, 2015 at 1:52pm

Grade 12 Physics
A rocket ship is moving away from the earth after having been fired from a launch pad in Florida. At what point above the earth's surface will the force of gravity be reduced to ½ of its original value? ------------------ Prior to this question I was given the ...
Tuesday, January 13, 2015 at 10:23pm

physics
Calculate the force of gravity on a 16 kg mass at Earth's surface. The mass of Earth is 6. 1024 kg, and its radius is 6.4 106 m.
Tuesday, January 13, 2015 at 6:17pm

Physics
The rate of motion of the earth at its equator is about 1,038 mi/h because of its rotation. From this information, estimate the earth's circumference using an order-of-magnitude estimate.
Tuesday, January 13, 2015 at 1:34pm

Physics
suppose you have a weight of 60 N. if the earth's mass decreased to one fourth its current mass, with no change in radius, then what would you weigh? Can you please explain how I can solve this problem?
Monday, January 12, 2015 at 8:40pm

Science please help thx
Convection cells are created by very hot material deep in the mantle rising, then cooling, sinking again and repeating the cycle. This process occurs because of the uneven distribution of ? Within the earth? Please fill in the question mark with a answer. a. Crystal plates B. ...
Monday, January 12, 2015 at 11:24am

Science
What is the main method of heat transfer from the core to the crust of earth? A. Conduction B. Convection C. Radiation
Monday, January 12, 2015 at 9:21am

Science
True or False: Tides are caused by the force of inertia from the sun and moon acting on earth.
Monday, January 12, 2015 at 12:16am

Biology check please
1. Who most influenced Darwin's idea that life could change slowly over a long period of time? (1 point) Malthus Hutton and Lyell Lamarck livestock breeders and farmers 2. Who most influenced Darwin's idea that some offspring are better suited to survival than others...
Friday, January 9, 2015 at 2:11pm

science
1 which of earths spheres contains most of its mass? A atmosphere B hydrosphere C geosphere* D biosphere 2 erosion and weathering are examples of which types of forces? A constructive forces B destructive forces* C gravitational forces D inertia-related forces 3 which of the ...
Friday, January 9, 2015 at 12:07pm

physics
weight of a person in newton on mars who weigh 882N on earth ( g = 9.8m/s^2). weight of person on earth who weighs 333N on mars.
Friday, January 9, 2015 at 2:40am

physics
weight of a person in newton on mars who weigh 882N on earth ( g = 9.8m/s^2)
Friday, January 9, 2015 at 2:38am

science
Is there any stars between the Earth and the Moon?
Friday, January 9, 2015 at 1:45am

Physics help - Earths force
Is the force of the earth’s gravity on the sun stronger, weaker, or the same as the force of the sun’s gravity on the earth? Explain why the sun’s attraction affects the motion of the earth more than the earth’s attraction affects the sun’s motion. So ...
Thursday, January 8, 2015 at 7:24pm

science
which one of these are not used to power generators? A- wind B- moving water C- hot rocks under earth's surface D- static electricity
Thursday, January 8, 2015 at 4:01pm

sdvfsd
The earth has a specific tilt to it. No the sun appears to move towards the north and the south but through all the time the rays of the sun fall directly at the equator but fall at an inclined level at the other places and hence the seasons change and during revolution on ...
Thursday, January 8, 2015 at 2:55pm

science
1. The Cenozoic Era is also referred to as the? A. Age of Mammals. B. Age of Fish. C. Age of Dinosaurs. D. First Era. 2. When new clay sediment is deposited on top of old beach material, it's known as? A. Transgression. B. Regression. C. Progression. D. Aggression. 3. ...
Thursday, January 8, 2015 at 12:34pm

physics
A proposed space station consists of a circular tube that will rotate about its center(like a tubular bicycle tire). The circle formed by the tube has a diameter of 1.1km. What must be the rotation speed(revolutions per day) in an effect nearly equal to gravity at the surface ...
Wednesday, January 7, 2015 at 11:33pm

mechanics and heat
At the same instant that a 0.5 kg ball is dropped from 25 m above earth , a second ball , with a mass of 0.25 kg , is thrown straight upward from earth’s surface with an initial speed of 15 m/s . They move along nearby lines and pass without colliding. What is the ...
Wednesday, January 7, 2015 at 7:34pm

Physic~~~
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. So I was doing this and I got stuck here; gs = G*Ms/Rs² = G*(95Me)/(9²Re²) = ge*(95/...
Tuesday, January 6, 2015 at 3:30pm

Science/earth
How does money and politics affect the public claims about global warming? Pick on news source (news company, think tank, or university) and investigate its credibility.
Tuesday, January 6, 2015 at 10:14am

physics
What is the distance from the earth's center to a point where your weight would be 1/25 of what you weigh at the surface?
Monday, January 5, 2015 at 8:44pm

Physics
a 4 kg object is taken to a planet that has 3 times the mass of earth and 1/2 the radius of earth. On this planet the mass of the object will be most nearly.. A. 12kg B. 3kg C. 48kg D. 4kg E. 24 kg
Sunday, January 4, 2015 at 9:45pm

Physics, Math, Aerospace, Engineering
A de-orbit burn, similar (but not the same) to that presented in the previous math problem, has been performed. During this de-orbit burn a pre-calculated ∆V (delta V, change in velocity) of 99.1 meters per second will be used to decrease the Shuttle’s altitude from...
Saturday, January 3, 2015 at 7:22pm

^NeEd HeLp^
What iz d. location ov d. MOON with respect 2 d. EARTH? that iz, iz d. MOON inside or outside ov d. EARTH?
Saturday, January 3, 2015 at 8:43am

Rocket Science
Calculate the minimum change in velocity (delta V or ∆V) required for the Space Shuttle to decrease its altitude to 60 miles if it’s orbiting with an apogee of 246 miles and a perigee of 212 miles above the surface of Earth
Thursday, January 1, 2015 at 8:13pm

earth science
the Julian calendar is the calendar we currently use. True or false. my guess is true
Thursday, January 1, 2015 at 2:34am

earth science
one reason the moon might be a better place than earth to study the universe is there is almost no atmosphere. True or False MY guess is false
Thursday, January 1, 2015 at 2:27am

Algebra-Check my answer please!
The Great Galaxy in Andromeda is about 2200000 light years from Earth. Light travels 5900000000000 miles in a year. How many miles is the Great Galaxy in Andromeda from Earth? I got 1.298* 10^20 miles. (This is the exponents unit)
Wednesday, December 31, 2014 at 5:49pm

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. So I calculated this and got 1.0 km/s, I was just wondering ...
Wednesday, December 31, 2014 at 1:49pm

Physics
What is the orbital velocity of the Earth around the Sun, assuming the Earth takes a perfectly circular orbit around the Sun? What would be the centripetal acceleration of the Earth around the Sun? (I have no clue :() From my textbook I found out that Earth has a mass of 5....
Wednesday, December 31, 2014 at 1:09pm

physics
what will be the centipetal acceleration on a man whose mass is 80 kg,when resting on a ground at the equator if the radius of the earth'R' is 6.4x10 power 6 meter.
Wednesday, December 31, 2014 at 5:39am

earth science
During the summer _________ in India, wet air from the Indian ocean brings heavy rain to India.
Tuesday, December 30, 2014 at 11:14pm

earth science
air pollution in pennsylvania causes ______ in new england because the wind blows the pollution into new England. can someone please help, I cant find this anywhere.
Tuesday, December 30, 2014 at 11:06pm

math
the distance from the sun to earth is about 1.5x10^11 meters. suppose light travels at a speed of 3x10^8 meters per second. About how long does it take light from the sun to reach earth? PLEASE HELP!!!
Friday, December 26, 2014 at 3:51pm

science
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...
Tuesday, December 23, 2014 at 7:04pm

SCIENCE
The burning of fossil fuels cause the earth to get warmer by putting carbon dioxide in the atmosphere and the carbon dioxide traps heat. MY GUESS: TRUE
Monday, December 22, 2014 at 6:34pm

EARTH SCIENCE
Smog is the worst in.. A. Chicago B. New York C. Los Angles MY GUESS: C. LOS ANGLES
Monday, December 22, 2014 at 6:23pm

Earth science
TRUE OR FALSE The burning of fossil fuels cause the earth to get warmer by putting carbon dioxide in the atmosphere and the carbon dioxide traps heat. MY GUESS: TRUE Isobars help meteorologists find fronts on weather maps. MY GUESS: FALSE A CLOUD IS A COLLECTION OF WATER ...
Monday, December 22, 2014 at 6:12pm

phys
While spinning in a centrifuge, a 70.0 kg astronaut experiences an acceleration of 5.00 g, or five times the acceleration due to gravity on the earth. What is the centripetal force acting on her?
Sunday, December 21, 2014 at 2:17pm

Physics~
The moon's gravity is one-sixth that of the earth. What is the period of a 0.25 m long pendulum on the moon?
Sunday, December 21, 2014 at 1:58pm

physics
A person can jump to a height of 1.5m on surface of earth. Find the velocity with which he jumps.
Saturday, December 20, 2014 at 6:20pm

English--Edgar Allen Poe
I need some help with some questions about an excerpt from "The Tell-Tale Heart" by Edgar Allen Poe: "True! --nervous --very, very dreadfully nervous I had been and am; but why will you say that I am mad? The disease had sharpened my senses --not destroyed --not...
Saturday, December 20, 2014 at 12:59am

Algebra
The half-life of a specific radioactive compound is 20 years. The equation used to model this half-life is y = 5 1/2(t/20) where t represents time. Currently, there are 5 pounds of this compound 15 feet below the earth's surface. When will there only be 4 pounds of this ...
Thursday, December 18, 2014 at 9:57am

Geology
The Sun Is 150 Million Kilometers From The Earth, And The Earth's Equatorial Radius Is 6378 Km. How Much Would You Expect The Sun's Intensity To Drop, Based Only On This Additional Distance?
Tuesday, December 16, 2014 at 11:17pm

math
A community group purchased 72 cedar tree and spruce tree seedlings to plant for an Earth Day project. The number of cedar trees was twice the number of spruce trees. How many of each type of tree seedling did the group purchase. (i think it is an equation question)
Tuesday, December 16, 2014 at 6:41pm

astronomy
Find an exact expression for the magnitude of the tidal force applied by Earth to our rock of mass m
Tuesday, December 16, 2014 at 4:09pm

science
why is it rare for the soft parts of an organism to become a fossil? a) the soft parts take a long time to decay b) the soft parts can be eaten by animals***** c) the soft parts cannot be buried in sediment d) the soft parts form petrified fossils which of the following terms ...
Monday, December 15, 2014 at 10:01pm

Society and Tech
According to Joel Cohen, head of the laboratory of populations at Rockefeller University, the earth's carrying capacity for human populations depends upon: A. reducing meat consumption. B. eliminating social barriers to innovation. C. individual choices concerning ...
Monday, December 15, 2014 at 5:07pm

astro
The intensity of an object is related to the distance d to the observer by the equation (I1/I2) = (d2/d1)2. If the apparent magnitude of the Sun seen from Earth has a value of -26.74, what is the apparent magnitude of the Sun seen from Neptune (30AU from the Sun)?
Monday, December 15, 2014 at 2:26pm

Science
The speed of light is 3 x 10 to the 8th power meters per second. If the sun is 1.5 x 10 to the 11th power meters from earth, how many seconds does it take light to reach the earth?
Monday, December 15, 2014 at 7:06am

physics
radius R of the orbit of a geosynchronous satellite that circles the earth. (Note that R is measured from the center of the earth, not the surface.) You may use the following constants: The universal gravitational constant G is 6.67×10−11N⋅m2/kg2. The mass of...
Sunday, December 14, 2014 at 10:44pm

physics
A radar antenna is tracking a satellite orbiting the earth. At a certain time, the radar screen shows the satellite to be 181 km away. The radar antenna is pointing upward at an angle of 66.2 ° above the ground. Find (a) the x and (b) the y components (in km) of the ...
Sunday, December 14, 2014 at 9:43pm

P.E. help
Non-renewable resources mean it takes a longer time for the earth to produce it than the rate at which we use it. True False Is the answer True?
Sunday, December 14, 2014 at 7:57pm

astronomy
What is the semi-major axis of an object that is in 2:1 mean motion resonance with Earth
Sunday, December 14, 2014 at 3:06pm

physics
prove that the moon complete its one revolution around the earth in (27.3) days.distance of moon from the surface of the earth is (380000km).
Saturday, December 13, 2014 at 12:37am

Science
An airplane with a speed of 27.4 m/s is climbing upward at an angle of 48° counterclockwise from the positive x axis. When the plane's altitude is 860 m the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath ...
Friday, December 12, 2014 at 8:06pm

math
There were 845 million facebook users in 2011 and 608 million in 2010. What is the percent since Facebook is now used by 1 in every 13 people on earth? is the answer:7.69% 1 x x - - 13 100
Friday, December 12, 2014 at 8:24am

geometry
Satellite Explorer VII, with a = 4465 and b = 4462, and with the center of the Earth being at one of the foci of the ellipse. Assuming the Earth has a radius of about 3960 miles,graph both the orbits of Explorer VII and earths surface on the same axis if the average radius of ...
Wednesday, December 10, 2014 at 11:17pm

science
Lava flows from cracks in the earth and hardens into basalt, what type of rock result, is the answer sedimentary
Wednesday, December 10, 2014 at 7:49pm

science
Heat and pressure change rock inside the earth crust into gneiss. What type of rock result. Is the answer igneous
Wednesday, December 10, 2014 at 7:31pm

Physics
Knowing the temperature at the surface of the Earth to be 72 F, find the temperature at the surface of Venus.
Wednesday, December 10, 2014 at 6:57pm

science
By studing rock layer scientist can learn about changes in earth formation and climate. True or false. Is the anser true
Wednesday, December 10, 2014 at 6:38pm

English language arts IV
Which words should be capitalized in the sentence " Hawaii has some of the most beautiful beaches on earth"
Wednesday, December 10, 2014 at 1:43pm

Science~!
What would happen to a object if the force of gravity on earth was decreased by half? A. mass would decrease b. its weight would decrease c its density would decrease d. its volume will decrease A certain object has a volume of 25.0 mL and mass of 100g whats the density of the...
Wednesday, December 10, 2014 at 1:07pm

physics
Consider a system of a cliff diver and the earth. The gravitational potential energy of the system decreases by 21,000 J as the diver drops to the water from a height of 32.0 m. Determine her weight in newtons.
Wednesday, December 10, 2014 at 10:45am

Science Please help
Some of the oldest rocks ever found have been estimated to be about 3.5 billion years old. Is it likely that these rocks were present when Earth was first formed? No, this rock is probably just a sedimentary rock that was formed by much younger igneous rocks. Yes, the oldest ...
Tuesday, December 9, 2014 at 10:49am

physics help!
The earth attracts a large flying bug toward its center with a force of 0.10 Newtons. With what force does the bug attract the earth itself? 1. 1.0 N 2. 0.10 N 3. Trillions of Newtons 4. 10 N 5. We need the mass of the bug. 6. Zero; the earth attracts the bug, not the ...
Monday, December 8, 2014 at 12:52am

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