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August 29, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

Post a New Question | Current Questions

Environmental Science
On Earth in the extreme northern and southern latitudes, how does the relationship between GPP and NPP change during an entire year’s time?
Thursday, October 10, 2013 at 10:29am

earth science
what element was in the ocean and what color was the water
Tuesday, October 8, 2013 at 5:28pm

earth science
How is the decaying of radioactive uranium into lead used to date rock?
Tuesday, October 8, 2013 at 5:26pm

poetry (Pioneer by Dorothy Livesay)
I have to answer the questions according to this poem, I have answered them but just want someone to look over them to see if they are right. The last one I had trouble with and need help on that one too. The answer that I think it is I have put arrows on them. Help would be ...
Monday, October 7, 2013 at 11:54am

Physics
A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0° above the horizontal. How long is she in the air before returning to Earth? (g = 9.81 m/s2)
Sunday, October 6, 2013 at 6:04pm

Physics
A rocket of 500 kg accelerates away from earth with an engine thrust of 13,500 N. a) what is the weight of the rocket? 4900 N b) how fast did the rocket accelerate? (I know the answer is 17.2 m/s^2 but how did they get that?)
Saturday, October 5, 2013 at 2:47pm

physics
A ball is thrown 107 m upward and then falls back to earth. Neglecting air resistance, how long will it be in the air? The acceleration of gravity is 9.8 m/s2 . Answer in units of s
Saturday, October 5, 2013 at 2:27pm

Physics
Many people mistakenly believe that the astronauts who orbit the Earth are "above gravity." Calculate g for space shuttle territory, 290 kilometers above the Earth's surface (dashed line in sketch). Earth's mass is 6 1024 kg, and its radius is 6.38 106 m (...
Saturday, October 5, 2013 at 1:19am

science
For many years pellagra was believed to be an infectious disease promoted by unsanitary conditions. it was common in sanatoriums and orphanages but only among the patients and not the staff. a study of the diets showed that suffers of pellagra rarely ate high quality proteins...
Thursday, October 3, 2013 at 12:09pm

physics
The acceleration due to the moon's gravity at its surface is less than what it is here on the surface of the earth. The computed value of 1.6 m/s2 is consistent with what the Apollo Program astronauts observed during their explorations there. Imagine an astronaut holding a...
Wednesday, October 2, 2013 at 10:12pm

Science
An advertisement claims that three out of five dentists prefer a particular type of toothpaste. After researching the study, you find that the toothpaste company paid for it. Why should you be skeptical of the advertisement's claims? a. because the dentists are showing ...
Wednesday, October 2, 2013 at 12:54pm

Science
How far does any object on Earth fall after being in free fall for 7.5 seconds? Remember g=9.81 m/s2
Tuesday, October 1, 2013 at 5:57pm

Astronomy
Now imagine you’re an astronomer on Earth looking at the spectrum of an object in space. In the spectrum you are looking for the so-called Lyman- alpha line of hydrogen which occurs at a wavelength of  = 122 nm. In your telescope, you observe the Lyman- ...
Tuesday, October 1, 2013 at 5:18pm

Physics
A small airplane has a speech of 200km/h with respect to the air. There is strong wind blowing at 77km/h at 23 north of east with respect to the Earth . A) in which direction should the plane head in order to land at an airport due north of its present location?B) what would ...
Tuesday, October 1, 2013 at 9:54am

Physics ...... Science
A small airplane has a speech of 200km/h with respect to the air. There is strong wind blowing at 77km/h at 23 north of east with respect to the Earth . A) in which direction should the plane head in order to land at an airport due north of its present location?B) what would ...
Monday, September 30, 2013 at 11:03pm

earth
Inclusion occurs when?
Monday, September 30, 2013 at 4:42pm

Physics
A bag of sugar weighs 6.70 lb on Earth. a) What would it weigh in newtons on the Moon, where the free-fall acceleration is one sixth that on Earth?
Monday, September 30, 2013 at 3:34pm

Science: physics
Why does the moon not require a push to keep it along its orbit around the earth? -I have to use Newton's first law of motion.
Monday, September 30, 2013 at 5:16am

Earth Science
A contour (topographic) map indicates that a stream is flowing across a landscape. If the stream has a constant volume, where on the map would the stream most likely have the highest velocity? a. As the stream moves across several closely spaced contour lines b. as the stream ...
Sunday, September 29, 2013 at 8:10pm

8th grade Science
In the early 1900s, Alfred Wegener noticed that some of the Earth's continents looked like they might fit together like a jigsaw puzzle. He also observed that the continents that looked like they fit together had similar plants, animals, and rock formations. From this ...
Sunday, September 29, 2013 at 6:09pm

math
light from the sun takes approximately 8 minutes to reach earth. If the light travels at a speed of 3 x 10 raised to 8 meters / second, calculate to 3 significant figures the distance from the sun to the earth
Sunday, September 29, 2013 at 10:02am

Geography
For this question, you need to apply what you learned about temperature controls to two locations on Earth. Discuss how the 5 factors influencing temperature patterns effect St. Louis, Missouri (38°39' N, 90°W; elevation 535 ft) and Singapore (1°24'N, 103&...
Saturday, September 28, 2013 at 11:36pm

Math (Algebra 2)
Source: At the end of 1993, scientists tracked 1550 nonfunctional components in orbit and projected 42 such objects are added each year. Suppose that an average of 15 of these are brought back to Earth each year. Question: Write the function "R" that models the total...
Saturday, September 28, 2013 at 5:19pm

physics
A student sets up an Atwood machine with a frictionless rope, a 4.5-kg mass, and a 9.5-kg mass. What will be the acceleration of the masses? Use the gravitational acceleration found on Earth: g = 9.8 m/s2.
Friday, September 27, 2013 at 5:27pm

earth science
what are the variables on rocks and minerals
Friday, September 27, 2013 at 8:42am

Calculus and vectors
A vector can be used to represent the path of a drill tip used to bore a deep mine shaft in Sudbury one quarter of the way to the centre of the Earth. Represent the vector using a directed line segment and Cartesian co-ordinates and describe which representation may be more ...
Friday, September 27, 2013 at 7:24am

Physics
A man has a mass of 80kg on the Earth's surface. Part A How far above the surface of the Earth would he have to go to "lose" 13% of his body weight?
Thursday, September 26, 2013 at 3:06pm

Science
1) Which of the following is a valid reason why a scientist might reject a scientific theory? (1point) Some people disagree with it. It covers too broad a topic. New evidence contradicts it.*** It is too old. 2) A scientific hypothesis must be (1point) Correct Able to be ...
Thursday, September 26, 2013 at 2:35pm

Earth Sciences, Geology
What means by 'Gemstone minerals'? Is there any difference between gemstone, minerals and gemstone minerals?
Thursday, September 26, 2013 at 6:26am

Physics 102
THIS IS A QUESTION IN MY PHYSICS BOOK & I REALLY REALLY NEED HELP. I AM 48YRS OF AGE JUST DECIDED TO GO BACK TO SCHOOL AND HONESTLY KNOW NOTHING ABOUT PHYSICS. Two facts: A freely falling object at Earth’s surface drops vertically 5 m in 1 s. Earth’s curvature “...
Wednesday, September 25, 2013 at 4:52pm

PSY 102
Two facts: A freely falling object at Earth’s surface drops vertically 5 m in 1 s. Earth’s curvature “drops” 5 m for each 8-km tangent. Discuss how these two facts relate to the 8-km/s speed necessary to orbit Earth.
Wednesday, September 25, 2013 at 3:47pm

chem
At noon on a clear day, sunlight reaches the earth\'s surface at Madison, Wisconsin, with an average power of approximately 4.00 kJ·s–1·m–2. If the sunlight consists of photons with an average wavelength of 510.0 nm, how many photons strike a 5.10 ...
Tuesday, September 24, 2013 at 10:40pm

Math!!!
What is the sign of each product? Explain. 32. n • n, where n is any nonzero number 33. y • y • y, where y is any negative number 41. Scientists drill 40,230 ft. Into Earth's crust. Write an integer to represent this depth. Estimate the depth drilled to the ...
Tuesday, September 24, 2013 at 10:32am

geometry
Earth completes one full rotation each day, making the Sun appear to rise and set. If the Sun passes directly overhead, by how many degrees does its position in the sky change every hour?
Monday, September 23, 2013 at 8:25pm

PHYSICS
Two facts: A freely falling object at Earth’s surface drops vertically 5 m in 1 s. Earth’s curvature “drops” 5 m for each 8-km tangent. Discuss how these two facts relate to the 8-km/s speed necessary to orbit Earth.
Monday, September 23, 2013 at 8:06pm

Earth Space(soon please!)
Hypothetically, how hot do you think a green star would be?
Monday, September 23, 2013 at 7:48pm

science. -_-
Okk so im not asking for answers, i just need somone to expplain this homework to me! I dont get it what so ever. So the homework tittle is Weight in space. So it has a whole discripition in wjich i will write dpwn for you. The paper says: Gravity is an invisible force that ...
Monday, September 23, 2013 at 4:35pm

physics
the earth is approximately sphere of radius 6.37*10^6 meter.what is its surface area in square km? what is its volume in cubic km?
Monday, September 23, 2013 at 12:44pm

Pre-Calculus
The Period T, in seconds, of a pendulum depends on the distance, L, in meters, between the pivot and the pendulum's centre of mass. If the initial swing angle is relatively small, the period is given by the radical function T=2pi(sqrtL/g) where g represents acceleration ...
Friday, September 20, 2013 at 9:32pm

Physics
On earth, two parts of a space probe weigh 17300 N and 3260 N. These parts are separated by a center-to-center distance of 19.4 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far...
Friday, September 20, 2013 at 2:42pm

Astronomy
What is the size, i.e. the radius, of a black hole with a mass equal to that of Earth (MEarth=6×1024kg)? Give your answer to one significant figure.
Tuesday, September 17, 2013 at 10:07pm

marketing
• What challenges do specialized magazines such as Mother Earth News face hen trying to entice advertisers? Create a pitch to a potential green-product advertiser stating the benefits of advertising in Mother Earth News.
Tuesday, September 17, 2013 at 7:33pm

Physics
Earth speeds along at 29.8 km/s in its orbit. Neptune's nearly circular orbit has a radius of 4.5 x 109 km, and the planet takes 164.8 years to make one trip around the Sun. Calculate the speed at which Neptune plods along in its orbit.
Tuesday, September 17, 2013 at 9:03am

Physics
Earth's mean radius and mass are 6,371 km and 5.97 x 1024 kg, respectively. Show that the acceleration of gravity at the surface of Earth is 9.80 m/s2.
Tuesday, September 17, 2013 at 8:01am

Earth Space
What is fission? How is Einstein's theory of special relativity expressed? What does each letter stand for?
Monday, September 16, 2013 at 5:24pm

Physics
A map suggests that Atlanta is 730 miles in a direction 5.00° north of east from Dallas. The same map shows that Chicago is 560 miles in a direction 21.0° west of north from Atlanta. The figure below shows the location of these three cities. Modeling the Earth as flat...
Sunday, September 15, 2013 at 7:23pm

Physical Science
a rocket moves through outer space at 11,000 m/s. At this rate, how much time would be required to travel the distance from Earth to the Moon, which is 381,000 km?
Sunday, September 15, 2013 at 11:52am

trg
An earth embankment is 27 m long and has a cross-section shown in the diagram. Find the volume of earth needed to build the embankment.
Sunday, September 15, 2013 at 8:05am

college physics
Nobel laureate Richard Feynman (1918-1988) once said that if two persons stood at arm's length from each other and each person had 1% more electrons than protons, the force of repulsion between them would be enough to lift a "weight" equal to that of the entire ...
Friday, September 13, 2013 at 11:52pm

PHYSICS
Nobel laureate Richard Feynman (1918-1988) once said that if two persons stood at arm's length from each other and each person had 1% more electrons than protons, the force of repulsion between them would be enough to lift a "weight" equal to that of the entire ...
Friday, September 13, 2013 at 3:51am

earth science
In what layer of the atmosphere do temperatures rise with altitude? A. Troposphere B. Mesosphere C. Mesopause D. Stratosphere is it d ?
Wednesday, September 11, 2013 at 9:26pm

Science
1) How does water vapour change into solid and liquid water above earth's surface? 2)does all surface runoff move directley into lakes, rivers and oceans? Please help asap it means alot!
Wednesday, September 11, 2013 at 6:33pm

math
Earth weight is 5.9736 x 10^24 Kg and Venus is 4.8685 x 10^24 Kg. What is the combined weight of Earth and Venus ? a)10.8421 X 10^26 Kg b)10.8421 x 10^23 Kg c)10.8421 x 10^25 Kg d)1.08421 x 10^25 Kg
Wednesday, September 11, 2013 at 3:21am

Physics
A car travels due east with a speed of 50.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth.The traces of the rain on the windows of the car make an angle of 60 degrees with the vertical. Find the velocity of the rain with respect to (a) ...
Tuesday, September 10, 2013 at 8:53pm

Astronomy
Earth is spinning along at 1,674 km/h at the equator. Use this number to find Earth's equatorial diameter.
Tuesday, September 10, 2013 at 5:18pm

Physics
Could someone explain to me about how live, earth and neutral wires work?
Monday, September 9, 2013 at 9:18am

earth sience
The point at which the continent stops and the rock of the ocean floor begins is the called the continental A. shelf. B. divide. C. drift. D. slope. is it d ?
Monday, September 9, 2013 at 12:37am

earth science
Which one of the following is not left in the land as a result of continental glaciers? A. Erratics B. Drumlins C. Loess D. Eskers
Monday, September 9, 2013 at 12:20am

Physics
I have really been struggling with this one and have come up with a wide variety of answers. Any help would be great: If the radius of a planet is larger than that of Earth by a factor of 8.25, how much bigger is the surface area of the planet than Earth’s?
Sunday, September 8, 2013 at 2:15pm

Physics
I have really been struggling with this one and have come up with a wide variety of answers. Any help would be great: If the radius of a planet is larger than that of Earth by a factor of 8.25, how much bigger is the surface area of the planet than Earth’s?
Sunday, September 8, 2013 at 2:09pm

Physics
The earth moves around the sun in a nearly circular orbit of radius 1.50 x 1011 m. During the three summer months (an elapsed time of 7.89 x 106 s), the earth moves one-fourth of the distance around the sun. (a) What is the average speed of the earth? (b) What is the magnitude...
Saturday, September 7, 2013 at 9:19pm

Physics
If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 2.07 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2?
Saturday, September 7, 2013 at 2:52pm

main ideas
Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. A greenhouse used for plants stays warm because sunlight and heat coming through the glass roof are mostly trapped. The heat doesn't radiate back into the atmosphere ...
Friday, September 6, 2013 at 2:30pm

University Earth Sciences
What would happen if a planet's gravity drops? "Living things grow taller" "You can jump higher" Those are not answers I looking for, what I wanna know is if the centre pulling force of a planet is dropping, what would happen to it's mantle, plates...
Thursday, September 5, 2013 at 12:15pm

Math
Satelite orbits vary in their distance from the earth. Orbits can be anywhere from 252,800 to 35,200,000 yards. What is the greatest distance between satelite orbits? Round to the nearest ten thousand to estimate. For problem 3, find the exact difference
Thursday, September 5, 2013 at 10:34am

physics
A helicopter is ascending vertically with a speed of 5.03m/s . At a height of 132m above the Earth, a package is dropped from the helicopter. How much time does it take for the package to reach the ground?
Wednesday, September 4, 2013 at 6:33pm

science
Linear growth a. is characterized by a rapidly growing population. b. is demonstrated by the sequence 12, 13, 14, 15, 16. c. is illustrated by the numbers 2, 4, 8, 16, 32. d. is characterized by resource use and consumption. e. is characterized by a slowly decreasing ...
Tuesday, September 3, 2013 at 8:21pm

environmental science
A sustainable society a. manages its economy and population size without doing irreparable environmental harm. b. satisfies the needs of its people without depleting Earth capital. c. protects the prospects of future generations of humans and other species. d. all of these ...
Tuesday, September 3, 2013 at 8:16pm

Physical Science
Energy from the sun reaches Earth mostly by A. conduction. B. convection. C. radiation. D. thermal expansion. I think it's A.
Tuesday, September 3, 2013 at 4:07pm

Physics
Why is the most common frame of reference Earth?
Tuesday, September 3, 2013 at 2:25am

science
1. Earth's capital includes all of the following except a. wildlife. b. nutrients. c. water. d. soil. e. sunlight.
Monday, September 2, 2013 at 5:28pm

Calculus
Math questions, please help me? :(? Find the composite functions f o g and g o f for the given functions. f(x) = 10^x and g(x) = log x State the domain and range for each: f(x) = 4x + 1 and g(x) = x^2 f(x) = sin x and g(x) = x^2 - x + 1 f(x) = 10^x and g(x) = log x If f = {(-2...
Monday, September 2, 2013 at 4:08pm

Geography
How do El Nino and La Nina affect climate? My answer: El Nino affects the climate in a natural manner in which changes the ocean temperature and affects the weather worldwide by thrusting warm waters and heavy rains toward the Americas. La Nina affects the climate as well when...
Monday, September 2, 2013 at 1:39pm

help physics
A satellite, LangSat, moves in circular orbit around the Earth at a speed of 4.95kms-1. (i) What is the altitude of the satellite (ii) Determine the period of the satellite’s orbit (iii) What is the value of the gravity, g, at the satellite. (iv) If another satellite, ...
Monday, September 2, 2013 at 9:06am

Physics
Using the scale (1 light-minute equals 10 mm), how many millimeters represent a light year? On this scale, what is the distance from Earth to the nearest star? To the Andromeda Galaxy? (Note that 1 meter = 103 mm and that 1 km = 103 meters.)
Friday, August 30, 2013 at 8:25am

Physics
The information from an internet web host may sometimes reach your computer by traveling as light to a satellite approximately 3.6 x 107 meters above Earth's surface and back again. What is the minimum time, in seconds, that the information takes to reach your computers?
Friday, August 30, 2013 at 8:02am

Physics
(1) What is the linear speed of the earth in its orbit about the sun? Give your answer in meters per second. (Consider the earth's orbit to be a circle of radius 1.50×1011 m.) (2) What is the linear speed of Jupiter in its orbit about the sun? Give your answer in ...
Tuesday, August 27, 2013 at 7:54pm

Astronomy
For this question assume the moon is 110 of its diameter away from the Earth. The largest apparent size of Mercury that we ever see in the sky is 1/150 the apparent diameter of the Moon. The diameter of Mercury is about 4900 km. What is the closest that the Earth and Mercury ...
Tuesday, August 27, 2013 at 2:57pm

Geography
How does the movement of tectonic plates shape the earth's surface?
Monday, August 26, 2013 at 2:23pm

Geography
1.) Into which two hemispheres would an island at 50 degrees South, 60 degrees West be placed? Which of the five themes are reflected in your answer? 2.) How do the winds and the oceans distribute heat on the earth's surface? My answer: The motion od the ocean helps ...
Monday, August 26, 2013 at 12:32pm

Chemistry
Earth's oceans have an average depth of 3800 m, a total area of 3.63 108 km2, and an average concentration of dissolved gold of 5.8 10-9 g/L. (a) How many grams of gold are in the oceans? (b) How many cubic meters of gold are in the oceans? Assuming the price of gold is $...
Sunday, August 25, 2013 at 4:42pm

physics
A PARTICLE OF MASS M IS SHOT WITH an initial velocity v making an angle b with the horizontal,the particle moves in the gravitational field of the earth. find the angular momentum of the particle about the origin when the particle is at the origin ,at the highest point of its ...
Thursday, August 22, 2013 at 7:23pm

english
Please show me this, on a A4 sheet paper paste a cutout of a picture of earth and write 8 adjectives in capital letter inside rectangular block( any coloue ink)
Thursday, August 22, 2013 at 3:46pm

English
I need to complete these sentences. I can't think of anything that would fit the caps locked word. Can you help me work through them? 1. Ralph wanted a BONA FIDE New York cheescake, so he....... 2.The formation of a pearl is an ADVENTITIOUS effect of...... 3.The fecund ...
Tuesday, August 20, 2013 at 4:14pm

Earth Space
Do the phases of the moon affect how much of the moon is illuminated? I said yes because thats what causes us to have the different shapes/phases of the moon. Whichever parts are lit up. Is the following sentence true or false? The cycle of the phases takes about two days ...
Monday, August 19, 2013 at 4:27pm

English
Imagine that you are an agent who is interested in publishing new authors. Choose any book you like and present the book to a publisher in New York. How's this; To whom it may concern, A very great friend of mine decided to begin writing the bible for kids. He just ...
Saturday, August 17, 2013 at 2:17am

Geometry
A person standing h feet above sea level can seecd miles to the horizon. The distance r is the radius of the earth = 3963 miles. d is the tangent to the circle forming a right angle to the radius. h + r is the tangent. Solve using Pythagorean theorem and secant-tangent theorem...
Thursday, August 15, 2013 at 11:33pm

Earth Space (In desperate need)
My teacher didnt have time to finish the lesson day, and I can't find the answers anywhere online or in my book. What are 2 main ways in which the earth moves? What does each movement cause? I have it rotates on its axis which causes seasons, but I cant think of other ones...
Thursday, August 15, 2013 at 4:07pm

math 15
find the minimum height above the surface of the earth so that the pilot at point a can see an object on the horizon at c 125 miles away. assume the diameter of the earth to be 8000 miles.
Tuesday, August 13, 2013 at 8:09am

science
whether a stone thrown upword with very high speed fall to the same point to the ground? If yes then why even the earth is in motion?
Thursday, August 8, 2013 at 10:13am

Science
I don't know the formula for calculating the magnitude of the momentum of the earth in its journey around the sun. The mass is 6x10^24kg and its radius of orbit is 1.5x10^11m.
Thursday, August 8, 2013 at 7:05am

Earth Space
Which branches of earth science would the hydrosphere interact with? I said biosphere, atmosphere, and geosphere. Is that correct?
Wednesday, August 7, 2013 at 4:23pm

physics
I am having a really hard time figuring this question out, would somebody be able to help me? Imagine a giant dry-cleaner's bag full of air at a temperature of -35∘C floating like a balloon with a string hanging from it 12km above the ground. Estimate what its ...
Monday, August 5, 2013 at 1:23am

physics
The loudest sound in Earth’s history is believed to be the explosion of the volcanic island of Krakatoa, back in 1883. Physicists estimate that the intensity of the sound produced was 1.0×107 W/m2. How many decibels does this correspond to?
Monday, July 29, 2013 at 10:13pm

physics
Our muscles atrophy when there is no gravitational force. On long space flights this is a problem, which is why astronauts exercise. On very long space flights it might be advisable to simulate gravity. Your space ship is a long cylinder of radius 100 m that spins about its ...
Monday, July 29, 2013 at 5:37am

geography
Compare and contrast folded mountains to volcanic mountains. How they are alike? How they are different? i got some of it.. Similarities: Both were probably formed from convergent plate boundaries. Difference: Volcanic Mountains - are mountains that form when molten rock ...
Thursday, July 25, 2013 at 9:50am

earth
The radius of the sun is 695 500 km What is its approximate volume written in Scientific notation?
Tuesday, July 23, 2013 at 9:22pm

earth
What is an elipse of the sun and what is lunor elipse of the moon
Sunday, July 21, 2013 at 12:37pm

physics
The sun radiates like a perfect blackbody with an emissivity of exactly 1. (a) Calculate the surface temperature(K) of the sun, given it is a sphere with a 7.00 multiplied by 108 m radius that radiates 3.80 multiplied by 1026 W into 3 K space. (b) How much power(W/m^2)does the...
Sunday, July 21, 2013 at 3:01am

Physics
The sun radiates like a perfect blackbody with an emissivity of exactly 1. (a) Calculate the surface temperature(K) of the sun, given it is a sphere with a 7.00 multiplied by 108 m radius that radiates 3.80 multiplied by 1026 W into 3 K space. (b) How much power(W/m^2)does the...
Saturday, July 20, 2013 at 10:05pm

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