Saturday
December 20, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

Post a New Question | Current Questions

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

physics
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?
Monday, December 8, 2014 at 12:19am

Physics
1) Determine the force of gravitational attraction between the earth(m=5.98*10^24kg) and a 70-kg physics student if the student is in an airplane at 4.950 meters above the earth's surface.
Saturday, December 6, 2014 at 11:32pm

Physics
A projectile is shot straight up from the earth's surface at a speed of 1.20 x 104 km/hr. How high does it go?
Friday, December 5, 2014 at 8:15pm

physics
When an earthquake occurs, two types of sound waves are generated and travel through the earth. The primary, or P, wave has a speed of about 8.0 km/s and the secondary, or S, wave has a speed of about 4.5 km/s. A seismograph, located some distance away, records the arrival of ...
Friday, December 5, 2014 at 7:04am

Algebra
Please help me to to solve this quadratic equation word problem. Here is the question: Studying Microgravity. NASA'S Glen Research Center in Cleveland, Ohio, has a 435-foot drop tower that begins on the surface and descends into Earth like a mineshaft. How long will it ...
Friday, December 5, 2014 at 3:53am

Physics
Help!! I would greatly appreciate help with this question. Consider a pulse of laser light aimed at the Moon that bounces back to Earth. The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56s.
Thursday, December 4, 2014 at 10:55pm

physics
If the acceleration due to gravity on the earth is 9.8 m/s2, what is the acceleration due to gravity on Rams?
Thursday, December 4, 2014 at 11:06am

Algebra
Studying Microgravity. NASA'S Glen Research Center in Cleveland, Ohio, has a 435-foot drop tower that begins on the surface and descends into Earth like a mineshaft. How long will it take a sealed container to fall 435 feet? Round to the nearest tenth of a second.
Thursday, December 4, 2014 at 12:54am

math
The ratio of an object's weight on Earth to its weight on Neptune is 5 : 7. How much would a person who weighs 150 pounds on Earth weigh on Neptune?
Wednesday, December 3, 2014 at 6:28pm

physics
A 0.80-m aluminium bar is held with its length parallel to the east-west direction and dropped from a bridge. Just before the bar hits the river below, its speed is 22 m/s, and the emf induced across its length is 5 X 10-4 V. Assuming the horizontal component of the earth'...
Tuesday, December 2, 2014 at 11:19pm

physics
A man weighs 750.0 N on Earth at what altitude will he weigh 187.5 N?
Tuesday, December 2, 2014 at 7:19pm

Earth Science
Which of the following statements correctly describes the asthenosphere? 1- it is thin cold and rigid layer 2- it is the source of the earth's heat 3- it permits plate motion 4- it occurs only near subduction zones My answer is 1
Tuesday, December 2, 2014 at 7:02pm

science
Sarah wants to use a model to get an idea of how far away the stars are. She uses a marble to represent the Earth, and she places a basketball 1 m away to represent the Sun, which is the nearest star. If Sarah wishes to keep the distances between objects in her model at an ...
Tuesday, December 2, 2014 at 3:24pm

Physics
A proposed space station includes living quarters in a circular ring 50.5 m in diameter. At what angular speed should the ring rotate so the occupants feel that they have the same weight as they do on Earth?
Tuesday, December 2, 2014 at 2:54pm

Science.. Need help ASAP!
How is an area's topography determined? a.By using an area's longitude and latitude b.By using an area's scale c.By using an area's elevation, relief, and landforms * d.By using an area's elevation, longitude, latitude How are lakes and ponds similar? a. ...
Monday, December 1, 2014 at 6:56pm

Science.. Need help ASAP!
How is an area's topography determined? a.By using an area's longitude and latitude b.By using an area's scale c.By using an area's elevation, relief, and landforms d.By using an area's elevation, longitude, latitude How are lakes and ponds similar? a. ...
Monday, December 1, 2014 at 6:30pm

Science.. Need help ASAP!
How is an area's topography determined? 1.By using an area's longitude and latitude 2.By using an area's scale 3.By using an area's elevation, relief, and landforms 4.By using an area's elevation, longitude, latitude How are lakes and ponds similar? 1. ...
Monday, December 1, 2014 at 5:50pm

physics
You test a moon buggy on earth. When the buggy hits a bump, it oscillates up and down on its springs with a period of 4 seconds. Will the period be the same when buggy is used on the moon?
Monday, December 1, 2014 at 4:28pm

check my science hw please.
26. In the last few centuries, the number of species becoming extinct on Earth has A.decreased dramatically B. decreased slightly. C. increased slightly. D.increased dramatically I think it should be C.
Sunday, November 30, 2014 at 11:04pm

algebra
You must submit your response as a file. An object’s weight depends on its height above the surface of the earth. If a man weighs 190 pounds on the surface of the earth, then the man's weight in pounds (W) x miles above the surface is approximated by the formula: W...
Sunday, November 30, 2014 at 8:52pm

Pyhsics
A) On planet X, an object weighs 19.2 N. On planet B where the magnitude of the free-fall acceleration is 1.17 g (where g = 9.8 m/s2 is the gravitational acceleration on Earth), the object weighs 34.9 N. The acceleration of gravity is 9.8 m/s2 . What is the mass of the object ...
Friday, November 28, 2014 at 9:52pm

physics
Using sidereal navigation, a pilot flies due south for one hour then due north one hour and lands about 180 miles west of where he started. At what point on Earth is he?
Wednesday, November 26, 2014 at 10:59am

english
The old fisherman floated on the Black Sea, boat bobbing from side to side as a frigid wind sliced through his threadbare sweater. Though the fisherman and his wife were struggling to survive without much money, he thought happily of the meager but delicious dinner of homemade...
Wednesday, November 26, 2014 at 10:43am

physics
Calculate the radius of a “super- Earth” with 10 times the mass of Earth, using Earth data as a starting point.
Monday, November 24, 2014 at 6:28pm

INTSCIENCE
The earth can be considered a heat engine because it receives heat from the sun and converts it into mechanical energy to produce winds and evaporate water. True False
Monday, November 24, 2014 at 11:13am

int.science
The earth can be considered a heat engine because it receives heat from the sun and converts it into mechanical energy to produce winds and evaporate water. True False
Monday, November 24, 2014 at 10:52am

Earth Science
Describe the difference in evolution between a supercell that develops in an environment with unidirectional wind shear and a supercell that develops in an environment with veering winds. What is causing this difference in evolution? THANKS!!
Monday, November 24, 2014 at 5:47am

algebra
the ratio of the weight of an object on jupiter to its weight on earth is 8 to 3. how much would a 100 pound person weigh on Jupiter? i`ll tell you the answer when am done solving so you can check if am right
Saturday, November 22, 2014 at 8:37pm

Biology
I think this is a shot in the dark, but worth a try. I have the Biology: Life on Earth by Audesirk, Audesirk & Byers 10th edition bought used online, apparently there are some pages missing in the book, so I can't do my homework, if anyone has the book could, you help me ...
Saturday, November 22, 2014 at 8:02pm

science
As an object get farther from earth is A. its weight increase B.it weight decrease C. it mass decrease D. it weight remains the same I am not sure but is it A(or b)
Friday, November 21, 2014 at 8:01pm

Physics
A distant planet has a mass of 0.6400 ME and a radius of 0.9000 RE. What is the ratio of the escape speed from this planet to the escape speed from the earth?
Friday, November 21, 2014 at 11:20am

Earth Science - NEED HELP QUICK
What is the thickness of the layer from 1000 - 850 mb if the mean temperature of the layer is 2 C? From what it says in my textbook it seems as if mb = hPa so all you do is 850 - 1000 = -150 hPa but I am pretty sure that is wrong because what do you do with the temperature?? ...
Friday, November 21, 2014 at 8:41am

Earth Science
Use angular momentum arguments to describe why a parcel of air moving from the equator towards the North Pole will be deflected to the east. It may be helpful to show equations in your response. THANKS
Thursday, November 20, 2014 at 8:44pm

Earth Science
Use angular momentum arguments to describe why a parcel of air moving from the equator towards the North Pole will be deflected to the east. It may be helpful to show equations in your response.
Thursday, November 20, 2014 at 4:58pm

Earth Science
What two types of air masses collide to form a dry line? On which side of this boundary would you expect to see rising motion, and why?
Thursday, November 20, 2014 at 12:03pm

Physics
A distant planet has a mass of 0.6400 ME and a radius of 0.9000 RE. What is the ratio of the escape speed from this planet to the escape speed from the earth?
Thursday, November 20, 2014 at 10:14am

3rd grade English
I'm trying too see if my daughter is doing her homework correctly .... The question is use each word or phrase as the subject of a sentence .add a verb describing an action that takes place in the present . Make sure each verb agrees with its subject Her answer was - the ...
Wednesday, November 19, 2014 at 7:50pm

physics
If a person pushes on a block and it travels a distance of 6.0m before stopping. How far would the block travel if it were pushed with the same force, but on the moon(which has 1/6 of the earth's gravity).
Wednesday, November 19, 2014 at 5:35pm

Physics
A meteorite weighing 1860N strikes the earth with a velocity of 45.2m/s. What is its kinetic energy? Write in SN to one decimal place. When I plugged in (1/2)(1860N)(45.2m/s)^2, I got the answer 1.9e6, but it was incorrect. Please help. I'm really confused!
Wednesday, November 19, 2014 at 5:27pm

English
Birches by Robert Frost When I see birches bend to left and right Across the lines of straighter darker trees, I like to think some boy's been swinging them. But swinging doesn't bend them down to stay As ice-storms do. Often you must have seen them Loaded with ice a ...
Wednesday, November 19, 2014 at 3:33pm

earth science
The active sections that are located along fault lines are called
Wednesday, November 19, 2014 at 2:48pm

Earth Science
List 3 distinguishing features found near a frontal boundary. Thanks
Wednesday, November 19, 2014 at 5:13am

Physics
A 5.00 x 102 kg hot air balloon takes off from rest at the surface of the earth. The buoyant force lifts the balloon straight up, performing 9.70 x 104 J of work on the balloon. At the instant the balloon's upward speed is 4.08 m/s, the balloon will be ____ m above the ...
Tuesday, November 18, 2014 at 6:12pm

Geometry
The radius of Jupiter is approximately 44,423 miles, and the radius of the Earth is approximately 3,960 miles. How many times larger is the volume of Jupiter than the volume of the Earth? Round your answer to the nearest whole number.
Tuesday, November 18, 2014 at 1:54pm

Science
True/false Earth's atmosphere oceans and continents began to form during the first several hundred million years of the Precambrian time.
Monday, November 17, 2014 at 6:13am

physics
On the moon, the acceleration due to gravity is only 1.6 m/s/s. If someone on earth can throw a baseball 24.2 m high, how high could he throw it on the moon?
Saturday, November 15, 2014 at 11:34pm

physics
A straight horizontal wire carries a current of 3.55 μA. A proton is moving above the wire in a direction parallel to it but opposite to the direction of the conventional current in the wire, at a constant velocity of 8.00×106 m/s. Assume that the force of gravity ...
Saturday, November 15, 2014 at 10:08pm

Science help
1. Which of the following can be expected to occur as climate change continues on Earth? decreased melting of sea ice decreased migration of pests and pathogens increased freshwater sources increased coastal flooding *** 2. Which piece of children’s’ playground ...
Friday, November 14, 2014 at 10:54pm

physics
using 6400 km as the radius of earth, calculate how high above earth's surface you would have to be in order to weigh 1/16th of your current weight.
Friday, November 14, 2014 at 3:07pm

History help
Weathering and erosion break down rocks and slowly create a) oxygen for plants. b) Earth's poles. c) tectonic plates. d) new landforms.***
Friday, November 14, 2014 at 9:19am

science
The Earth exerts an 850 N gravitational force on a man. What force does the man exert on the Earth? Answer in units of N
Thursday, November 13, 2014 at 3:18pm

Astronomy
A simple temperature model for the solar nebula disk is Tdisk(a) = 20 � SQRT 100 AU/ a K, (1) where a should be expressed in AU in this equation. (a) Find the temperature in the solar nebula disk at the orbit of Mer- cury, Earth and Jupiter. (b) Where is...
Thursday, November 13, 2014 at 1:38pm

physics / astronomy
A simple temperature model for the solar nebula disk is Tdisk(a) = 20 × SQRT 100 AU/ a K, (1) where a should be expressed in AU in this equation. (a) Find the temperature in the solar nebula disk at the orbit of Mer- cury, Earth and Jupiter. (b) Where is ...
Thursday, November 13, 2014 at 8:46am

physics
A simple temperature model for the solar nebula disk is Tdisk(a) = 20 × SQRT 100 AU/ a K, (1) where a should be expressed in AU in this equation. (a) Find the temperature in the solar nebula disk at the orbit of Mer- cury, Earth and Jupiter. (b) Where is ...
Thursday, November 13, 2014 at 12:37am

Physics
The diameter of the Moon is 3.78x10^6m. It subtends an angle of .00982 radians at the surface of Earth. How far is the Moon from Earth? (Please explain I can't wrap my head around this question.)
Thursday, November 13, 2014 at 12:14am

English
Would down to earth be considered a character trait?
Wednesday, November 12, 2014 at 9:23pm

Physics
A pendulum on earth swings with angular frequency ω. On an unknown planet, it swings with angular frequency ω /2. The acceleration due to gravity on this planet is A) 4g B) 2g C) g/2 D) g/4 I think it is C but I am not sure...
Wednesday, November 12, 2014 at 8:14pm

English
Part (a) – What theme do you think the poet is exploring in this poem? Part (b) – How does the poet use language in this poem to present his ideas? The poem is = FARM CHILD Look at this village boy, his head is stuffed With all the nests he know, his pockets with ...
Wednesday, November 12, 2014 at 3:52pm

College Algebra
Ozone occurs at all levels of Earth's atmosphere. The density of ozone varies both seasonally and latitudinally. At a given city, the density D(h) of ozone (in 10^−3cm/km) for altitudes h between 20 kilometers and 35 kilometers was determined experimentally. For the ...
Wednesday, November 12, 2014 at 2:12pm

physics
An object on earth has a weight of 54.3N, what is the weight of the object on the moon, assuming acceleration due to gravity on the moon is 1.61m/s^2?
Tuesday, November 11, 2014 at 4:39pm

physics
A gas molecule at the surface of the earth happens to have the root mean square speed (rms)for that gas at 0°C.lf it were to go straight up without colliding with other molecules.How high would it rise and what would happen to the maximum height reached if a gas with ...
Tuesday, November 11, 2014 at 5:59am

Math
Ozone occurs at all levels of Earth's atmosphere. The density of ozone varies both seasonally and latitudinally. At a given city, the density D(h) of ozone (in 10^−3cm/km) for altitudes h between 20 kilometers and 35 kilometers was determined experimentally. For the ...
Monday, November 10, 2014 at 3:04pm

Physics
A space vehicle is orbiting Earth in a circular orbit with a radius of 10,300,000m. What is the minimum increase in speed that is needed for the vehicle to escape Earth's gravitational field? The mass of the Earth is 5.97x10^24 kg and G = 6.67x10^-11 N*m^2/kg^2. The answer...
Monday, November 10, 2014 at 10:38am

ASTRONOMY
Good evening all, I am working on a PowerPoint presentation for my Astronomy class about planet Earth - my question is: What is Earth's brightest apparent magnitude (if it has one)? I have searched every reliable source I know of (and that I come across), but I cannot seem...
Friday, November 7, 2014 at 10:21pm

Physics
calculate the escape velocity on the surface of earth, acceleration due to gravity will be 36 percent of its value on the surface of earth .if mean radius is 6400 km?
Friday, November 7, 2014 at 8:51pm

Physics
A pendulum consists of a 2.1 kg stone swinging on a 3.6 m string of negligible mass. The stone has a speed of 7.9 m/s when it passes its lowest point. (a) What is the speed when the string is at 60° to the vertical? (b) What is the greatest angle with the vertical that the...
Friday, November 7, 2014 at 6:23pm

Physics
What is the apparent weight of a 70-kg astronaut 3800 km from the center of the earth's moon in a space vehicle moving at constant velocity and acceleration toward the moon at 2.9m/s^2? State the direction in each case.
Thursday, November 6, 2014 at 11:30pm

Calculus
When estimating distances from a table of velocity data, it is not necessary that the time intervals are equally spaced. After a space ship is launched, the following velocity data is obtained. Use these data to estimate the height above the Earth's surface at 120 seconds...
Thursday, November 6, 2014 at 10:10pm

geometry
A total solar eclipse occurs when the moon passes between the earth and the sun, and the darkest shadow cast by the moon, called the umbra, hits the surface of the earth. If the umbra does not hit the surface, as shown in the following figure, then a total solar eclipse is not...
Thursday, November 6, 2014 at 8:05pm

Earth Science I suppose
What does the pattern of convection have to do with the typical path of a hurricane?
Thursday, November 6, 2014 at 4:22pm

English 3
"When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume among the powers of the earth, the separate and equal station to which the Laws of Nature and of Nature's God...
Monday, November 3, 2014 at 11:59am

Grammar
I sighed as I went down the stairs, thinking what on earth does this woman want me to do now. How do i say this correctly?
Monday, November 3, 2014 at 1:57am

English
Read the following passage and identify at least 3 elements of figurative language; explain how each element brings out the theme of the passage. "The Wrong Place" by Susan Michalski Lana woke up, curled in a corner of the seat at the back of the train. She lifted ...
Sunday, November 2, 2014 at 6:22pm

Physics
Determine Centripetal Acceleration acting on the person standing at the equator? (the radius of earth is given)
Sunday, November 2, 2014 at 11:03am

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