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October 1, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

Post a New Question | Current Questions

English
I read Shakespeare's sonnet 29, and I must write a 5 paragraph essay on the theme. I need a few guidance tips and ideas on what to write. Thanks in advance! So, There are multiple themes in this poem but I chose the theme(my main discussion) 'wealth',and I hope to ...
Tuesday, September 30, 2014 at 11:39pm

Physics
Q. Defined escape velocity obtain an expression for the escape velocity of a body from the surface of the earth?
Tuesday, September 30, 2014 at 11:30pm

physics
calculate at what height above the earths surface a satellite must be placed if it is to remain over the same geographical point on the equator of the earth. what is the velocity of the satellite?
Tuesday, September 30, 2014 at 8:22pm

Science
May you please tell me if these are true or false, if they are false then can I have the true statement, thank you In the water cycle, water returns to Earth as (condensation) usually in the form of rain or snow During dry weather, the water level in a small pond drops because...
Monday, September 29, 2014 at 9:53pm

science
an astronaut has a mass of 60 kilograms on earth. what would her mass be on mars? what would her weight be on mars? the strength of gravity o mars is 3.7 m/s^2.... am having a slow moment, please help
Monday, September 29, 2014 at 7:02pm

science
So the question is write down three examples of science in your everyday life. This was my answer: sound- compression wave, Baked goods- chemical reaction, Looking at mountains or ocean- earth science Please check my answer and see if this is good thank you
Monday, September 29, 2014 at 5:10pm

Earth Science
Explain how you could measure the density of a mineral with an exact amount of water and a scale .
Monday, September 29, 2014 at 2:15pm

physics
A certain muon detector counts 600 muouns/h at an altitude of 1900m and 380/h at sea level. Given that the muon half-life at rest is 1.5×(10^-6)s, determine the speed of the muons relative to Earth, assuming they all have the same speed.
Monday, September 29, 2014 at 11:23am

Earth science
A sphere was dropped into water in a graduated cylinder as shown in the following diagram.The water level rose th the new level shown .What is the volume of the sphere
Sunday, September 28, 2014 at 9:42pm

physics
A radar antenna is tracking a satellite orbiting the earth. At a certain time, the radar screen shows the satellite to be 118 km away. The radar antenna is pointing upward at an angle of 58.2 ° above the ground. Find (a) the x and (b) the y components (in km) of the ...
Sunday, September 28, 2014 at 8:47pm

earth science
If the earth was made 4.5 billion years ago, how comes we don't have any craters or rocks from that time?
Sunday, September 28, 2014 at 6:35pm

physics
If the acceleration due to gravity on the Moon is 1/6 that what is on the Earth, what would a 100 kg man weight on the Moon? If a person tried to simulate this gravity in an elevator, how fast would it have to accelerate and in which direction?
Saturday, September 27, 2014 at 10:56pm

Science
Suppose a geologist is studying two distinct areas next to a spreading ridge. The magnetic direction of the minerals in the oldest area is opposite to the magnetic direction of minerals in the newest area. a) Which area is closest to the center of the ridge, the older of the ...
Saturday, September 27, 2014 at 6:44pm

physics
A geosynchronous satellite is one that appears to be fixed in the sky, a condition useful for telecommunications. If such a satellite orbits the earth at an altitude of 33000 km above the earth's surface, what is its centripetal acceleration? The radius of the Earth is ...
Saturday, September 27, 2014 at 1:19pm

physics
A satellite of mass 205 kg is launched from a site on Earth's equator into an orbit at 200 km above the surface of Earth. (a) Assuming a circular orbit, what is the orbital period of this satellite? s (b) What is the satellite's speed in its orbit? m/s (c) What is the ...
Saturday, September 27, 2014 at 11:48am

Math
A souvenir consisting of a cube with an inserted sphere is made to represent Earth. Both pieces are made out of solid crystal. The sphere replaces one quarter of the volume of the cube. Calculate the volume of the souvenir piece. The sphere has diameter of 4 cm and the cube ...
Wednesday, September 24, 2014 at 11:13pm

Math
The weight w of an object varies inversely as the square of the distance d from the center of the earth. At sea level (3978 miles from the center of the earth), an astronaut weighs 110 pounds. Find her weight when she is 139 miles above the surface of the earth and the ...
Wednesday, September 24, 2014 at 7:44am

physics
An airplane with a speed of 53.8 m/s is climbing upward at an angle of 42° with respect to the horizontal. When the plane's altitude is 840 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point of...
Wednesday, September 24, 2014 at 1:37am

physics
If the earth doubled in mass but stayed the same size, what would be the acceleration due to gravity at the surface? m/s2 The dimensions of the earth as we currently know it are: Mass = 5.98E24 kg, Radius = 6.38E6 m and the universal gravitational constant = 6.67e-11 nm2/kg2
Tuesday, September 23, 2014 at 10:42pm

Math
A satellite will be released into an orbit of more than 400 miles above the earth. the rocket is carrying it is currently 255 miles above earth write and solve an inequality to show how much higher the rocket must climb before it releases the satellite 255+m>400 m>145
Tuesday, September 23, 2014 at 5:43pm

Calculus
A spacecraft is in an elliptical orbit around the earth. At the time t=0 hours, it is at its apogee (highest point), d=1000 km above the earth's surface. It is at its perigee (lowest point) d=100 km above the surface 50 minutes later. a. Assuming that d varies sinusoidally...
Tuesday, September 23, 2014 at 5:30pm

Science--Help.
Which of the following is NOT one of the eight most common elements in Earth’s continental crust? carbon silicon oxygen aluminum The most abundant element in Earth’s continental crust (by weight) is _____. 2. oxygen silicon calcium iron 3. The central region of an ...
Tuesday, September 23, 2014 at 11:40am

math
If the sun is aplroximantely 1.5×10^(11) meters from Earth, what is the approximate distance from Earth to Mars.
Monday, September 22, 2014 at 9:31pm

physics
A military helicopter on a training mission is flying horizontally at a speed of 75.0m/s when it accidentally drops a bomb (fortunately, not armed) at an elevation of 310m . You can ignore air resistance. a:How much time is required for the bomb to reach the earth? b:How far ...
Monday, September 22, 2014 at 12:46am

Physics
Obi-Wan lands his spacecraft on an unknown planet. Visibility is poor, so he isn't able to exactly determine on which planet he has landed. He finds someone on a local communications channel and asks for directions to Earth. "You are already on Earth," is the ...
Sunday, September 21, 2014 at 9:42pm

Physics
The mass of the Earth=Mg=5.97x10^24 kg. The radius of the Earth=RE= 6.38 x10^6 m. A) What is the weight of the 75 kg person? B) Determine the acceleration due to gravity aboard a space shuttle at an altitude of 400km.
Sunday, September 21, 2014 at 9:25pm

Physics help ASAP
Suppose you are visiting a planet in a distant part of the galaxy.To determine the acceleration due to gravity on this planet, you drop a rock from a height of 55 m. The rock strikes the ground 1.9 s later.How many times greater is the acceleration due to gravity on this ...
Saturday, September 20, 2014 at 10:52pm

Physics
A particle is moving at 0.75c relative to a lab on Earth. By what percentage is the Newtonian expression for its momentum in error, i.e., how wrong is the classical formula? (The percentage error is the difference between the erroneous and correct values, divided by the ...
Saturday, September 20, 2014 at 4:58pm

physics
The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 78 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m
Saturday, September 20, 2014 at 12:12am

physics
An airplane with a speed of 85.3 m/s is climbing upward at an angle of 45.0 ° with respect to the horizontal. When the plane's altitude is 587 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
Friday, September 19, 2014 at 7:03pm

physics- HELP
An airplane with a speed of 85.3 m/s is climbing upward at an angle of 45.0 ° with respect to the horizontal. When the plane's altitude is 587 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
Friday, September 19, 2014 at 2:11pm

Adverb Objects CHECK PLEASE
Thanks for checking my answers 1. D 2. C 3. C 4. C 5. D 1. Which words make up the adverb phrase in this sentence? After his speech,the politician greeted his supporters. A. his supporters B. greeted his C. the politician D. After his speech 2. Which words make up the adverb ...
Friday, September 19, 2014 at 11:42am

physics
An airplane with a speed of 85.3 m/s is climbing upward at an angle of 45.0 ° with respect to the horizontal. When the plane's altitude is 587 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
Friday, September 19, 2014 at 3:00am

Physics
the acceleration due to gravity on the moon is 1/6 that on earth. For a projectile with an initial velocity of 15m/s upward what would be the maximum height and total time of flight on the moon and on the earth?
Thursday, September 18, 2014 at 10:31pm

science
what keeps the earth cool during the day and warm at night
Thursday, September 18, 2014 at 7:52pm

earth space science
What include things like temperature, precipitation and humidity
Thursday, September 18, 2014 at 7:42pm

english
Is these sentences are correct. Even though we have discovered thousands of dinosaur fossils, we still don’t know much about these creatures. While they dominated the earth longer than humans have, they suddenly died out for unexplained reasons.
Thursday, September 18, 2014 at 10:04am

english
Combine these four sentences using complex compound sentences. We have discovered thousands of dinosaur fossils. • We still don’t know much about these creatures. • They dominated the earth longer than humans have. • They suddenly died out for unexplained ...
Wednesday, September 17, 2014 at 11:57pm

Physics
On Earth a fit astronaut without a space suit and life support pack can leap straight up and leave the ground with an initial vertical velocity of about v1y = 2.4 m/s and rise to a height of about h = 0.24 m above the point where he first loses contact with the ground. On the ...
Wednesday, September 17, 2014 at 8:38pm

history.
My name is Kashaf and i am 10 years old please!!! i need someone to answer my question. Compare the imagination of Earth's beginning and the appearance of first ape like man? I'll be very thankful to the one who will answer it in just a few minutes! Thank's alot!
Wednesday, September 17, 2014 at 1:37pm

Physics
(c) On Earth a fit astronaut without a space suit and life support pack can leap straight up and leave the ground with an initial vertical velocity of about v1y = 2.4 m/s and rise to a height of about h = 0.24 m above the point where he first loses contact with the ground. On ...
Wednesday, September 17, 2014 at 1:09pm

biology
Which of the following would NOT likely have occurred without the evolution of photosynthetic organisms? A. Life would be much less diverse. B. Most organisms would have gone extinct due to the increase in oxygen. C. Mitochondria-containing cells would not have evolved. D. ...
Tuesday, September 16, 2014 at 10:28pm

algebra
an astronaut who weighs 85 kilograms on the earth weighs 14.2 kilograms on the moon. how much would a person weigh on the moon if they weigh 95 kilograms on earth? round your answer to the nearest tenth.
Tuesday, September 16, 2014 at 10:12pm

Science!
If a bowling ball were moved from Earth to the moon, how would it's weight and mass change? A. The bowling ball would weigh the same, but it's mass would increase. B. The bowling ball would weigh the same, but it's mass would decrease. C. The bowling ball would ...
Tuesday, September 16, 2014 at 5:37pm

early history
Who were the first people on earth?
Monday, September 15, 2014 at 5:47pm

Science
1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly. Scientists use models of natural systems because they like to use art in science. ...
Monday, September 15, 2014 at 3:04pm

Earth Science
7. The original location of an earthquake is also known as the A. hotspot. B. magnitude. C. horizon. D. epicenter.
Monday, September 15, 2014 at 1:18pm

Science
The geologic time scale originally ordered earth's rocks by? a) Absolute age. b) Relative age. c) Composition. d) Decades and centuries.
Monday, September 15, 2014 at 9:15am

Physics
An airplane flies 220 km due east, makes a right-angle, and then flies 400 km due north. Find the magnitude of the plane's displacement from it's starting point. Neglect the culrvature of the earth
Sunday, September 14, 2014 at 8:59pm

phy
A 2000 kg satellite orbits the earth at a height of 300 km. What is the speed of the satellite and its period? Take , Mass of the earth is kg
Sunday, September 14, 2014 at 8:12pm

Physics
An airplane with a speed of 85.4 m/s is climbing upward at an angle of 37.6 ° with respect to the horizontal. When the plane's altitude is 520 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
Sunday, September 14, 2014 at 7:23pm

physics
It has been suggested, and not facetiously, that life might have originated on Mars and been carried to Earth when a meteor hit Mars and blasted pieces of rock (perhaps containing primitive life) free of the surface. Astronomers know that many Martian rocks have come to Earth ...
Sunday, September 14, 2014 at 6:22pm

Physics
Calculate the energy needed to accelerate a spaceship of mass 10,000 kg to a speed of 0.3c for intergalactic space exploration. Compare with the projected energy usage of the Earth in a decade 10^22J?
Sunday, September 14, 2014 at 5:01pm

Physics
Calculate the energy needed to accelerate a spaceship of mass 10,000 kg to a speed of 0.3c for intergalactic space exploration. Compare with the projected energy usage of the Earth in a decade~10^22J? well i don't know how to start the problem
Sunday, September 14, 2014 at 4:30pm

physics
If you could travel with speed of light (3.0E5 km/s) it would take only 1.3 seconds to reach Moon. How far is Moon from Earth?
Saturday, September 13, 2014 at 10:57pm

Physics
A projectile is launched from the earth’s surface at initial speed v0 at angle θ0 with the horizontal. When the projectile is at its maximum height h, it has half the speed it had when it was at half its maximum height (h/2). At what angle was the projectile launched?
Saturday, September 13, 2014 at 9:19pm

Science (college level)
1. What solar temp is needed for the peak intensity of radiation to occue at .2 micrometers? Remembering that humans can see light only between .4 and .7 microns, would the sun look brighter or dimmer at this new temp? 2. How much variation in earth orbital distance from the ...
Friday, September 12, 2014 at 5:07am

Atmospheric Science
1. What solar temp is needed for the peak intensity of radiation to occue at .2 micrometers? Remembering that humans can see light only between .4 and .7 microns, would the sun look brighter or dimmer at this new temp? 2. How much variation in earth orbital distance from the ...
Thursday, September 11, 2014 at 9:27pm

Force of Gravity
How far from Earth's surface would you have to travel to be 1/4 your weight. Give your answer in Earth radii. I know you have to travel twice the distance or 1 Earth radii... I just don't know how to mathematically show it. Please help.
Thursday, September 11, 2014 at 12:59am

Quantitative Reasoning (math)
Your weight on the moon is relative to your weight on Earth. Neil Armstrong weighed 360 lbs. in his moon gear while on Earth, but on the moon he only weighed 60 lbs. What is the ratio of the Earth weight to the moon weight? How much would you weigh (approximately) on the moon?
Thursday, September 11, 2014 at 12:14am

physics
A kangaroo jumps straight up to a vertical height of 1.19m, how long was it in the air before returning on earth
Wednesday, September 10, 2014 at 7:18pm

Biology
For each of these properties, give an example of how water’s properties affect life on earth. Able to dissolve salt or sugar • unable to dissolve oil • high surface tension (cohesion) • capillary action (cohesion + adhesion) • liquid more dense than ...
Tuesday, September 9, 2014 at 6:17pm

Math
The mass of Saturn is about 100 times the mass of Earth which is 5.97 x10^23 kg. How heavy is Saturn?
Tuesday, September 9, 2014 at 4:14pm

Pyhsics
what is the speed of the rocket when it is 345 m above the surface of the earth?
Tuesday, September 9, 2014 at 1:36pm

rela
you will develop a project that communicates to people something about your world. i don't mean planet earth i mean the circumstances in which you find yourself on a daily basis your project should include information about many different parts of your life. you might ...
Monday, September 8, 2014 at 8:25pm

Science
Does Earth rotate or orbit each day?
Monday, September 8, 2014 at 7:38pm

Physics
A helicopter is ascending vertically with a speed of 5.66m/s. At a height of 106m above the Earth, a package is dropped from the helicopter. How much time does it take the package the package to reach the ground? (Ignore air resistance) I would like to know what my givens are ...
Monday, September 8, 2014 at 7:25pm

physics
A blue ball is thrown upward with an initial speed of 22.8 m/s, from a height of 0.8 meters above the ground. 2.8 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 10.9 m/s from a height of 29.3 meters above the ground. The force of ...
Monday, September 8, 2014 at 7:00pm

physiscs
if the largest mass that you could lift on earth is 150 Kg. What is the largest mass you could lift on the moon. My work 150kg/10NKg x/1.6Nkg on earth on the moon =24 kg on the moon
Saturday, September 6, 2014 at 10:58am

geography
hello. I am a 7th grader and can you please help me in the topic realms of the earth?
Saturday, September 6, 2014 at 10:38am

rela
you will develop a project that communicates to people something about your world. i don't mean planet earth i mean the circumstances in which you find yourself on a daily basis your project should include information about many different parts of your life. you might ...
Friday, September 5, 2014 at 8:14pm

Earth science
Kathleen made the diagram below to show how scientific knowledge changes over time. Which word or phrase best describes what scientists would do at the point indicated by the blank? Original data + new data =blank= modified data. Which would be the answer in the blank to fill ...
Thursday, September 4, 2014 at 11:31pm

Science
The inner planets- Mercury, Venus, Earth and Mars- were formed by a. Supernovas b. repeated collisions of asteroid sized debris (My Answer) ****** c. masses of cold hydrogen and helium d. collisions of large galaxies
Tuesday, September 2, 2014 at 6:25pm

geography
This process distributes the heat from the sun around the earth?
Monday, September 1, 2014 at 12:56am

geography
This reflects some heat back into space and traps some heat near the earth.
Monday, September 1, 2014 at 12:55am

astronomy 101
Given that the angular size of Venus is 53ŒŒ'' when the planet is 47000000kmkm from Earth, calculate Venus's diameter (in kilometers).
Saturday, August 30, 2014 at 8:42pm

Physics
The plane tectonic theory describes the motion of the continents across the face of Earth. Measurements suggest that Africa and South America were once connected and are drifting apart at an average rate of 3cm/yr. If the two continents are now 7x10^8 cm apart, how long has ...
Saturday, August 30, 2014 at 11:28am

Physical Science
The polar circumference of Earth is 40,000km. What distance corresponds to a change of one degree of latitude? A change of one one arcminute of latitude? Hint, an arcminute is 1/60th of a degree.
Saturday, August 30, 2014 at 9:27am

physics
A blue ball is thrown upward with an initial speed of 24.1 m/s, from a height of 0.6 meters above the ground. 2.9 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.5 m/s from a height of 31.8 meters above the ground. The force of ...
Saturday, August 30, 2014 at 12:19am

Language Arts - Please Check My Answers
Please help with the following: 1. Based on the myths “The Maori: Genealogies and Origins in New Zealand” and “The Raven and the First Men: The Beginnings of the Haida,” one way the Maori culture most differs from the Haida culture is that the Maori culture...
Friday, August 29, 2014 at 5:40pm

Physics
A red ball is thrown down with an initial speed of 1 m/s from a height of 27 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 24.5 m/s, from a height of 0.7 meters above the ground. The force of ...
Thursday, August 28, 2014 at 11:26am

physics
the diameter of the moon is 3480 km. A.)what is the surface area of the moon? B.)how many times larger is the surface area of earth?
Wednesday, August 27, 2014 at 12:07am

math
a. The formula for the velocity of an object is , where v is the velocity of the object, d is the distance traveled, and t is the time elapsed while that distance is traveled. If you had only this formula to work with, what should your first step be in determining how long it ...
Tuesday, August 26, 2014 at 10:17am

earth science
The process to convert seawater into fresh water is known as
Monday, August 25, 2014 at 1:36pm

Earth Science
Please help me with the following question: 8. Observations can lead to hypotheses. Hypotheses can lead to new experimentation. Which best describes an observation and hypothesis that might lead to new experimentation? A. Dr. Sattler discovers a new plant that grows near ...
Sunday, August 24, 2014 at 4:21pm

Physics
At what distance from the earth's surface will a mass of 40.0 kg be just 385.0 in weight?
Sunday, August 24, 2014 at 10:10am

Earth Science Continued
Please help me with the following questions: 1. John Dalton said that the total pressure (Pt) exerted by a mixture of gases in a container is equal to the sum of the individual pressures of each gas present (if each gas was the only one present in the container). Further ...
Saturday, August 23, 2014 at 4:19pm

Physics
1.) The earth's radius is about 3956.52 mi. An object that has a mass of 20 kg is taken to a height of 160 km above the earth's surface. a. What is the mass of the object at this height? b. How much does the object weigh at this height?
Friday, August 22, 2014 at 10:48am

Earth Science Continued
Please help me with the following questions: 1. A scientist suspected that the increase in the acidity of ocean water could have a devastating effect on organisms such as snails because it could break down calcium carbonate, a chemical that makes up their shells. Which could ...
Thursday, August 21, 2014 at 7:13pm

Earth Science
Please help me with the following questions: 1. A scientist suspected that the increase in the acidity of ocean water could have a devastating effect on organisms such as snails because it could break down calcium carbonate, a chemical that makes up their shells. Which could ...
Thursday, August 21, 2014 at 3:25pm

science
The time units used by scientists to divide Earth's history are part of the
Thursday, August 21, 2014 at 11:48am

physics
1) write the formula to find the magnitude of gravitational force between earth and an object on earth's surface 2) how does the value of gravitational force 'f'change between two objects? 3) what is direction of an object moving with an acceleration due to gravity?
Wednesday, August 20, 2014 at 6:27am

eave Earth
any one object which you would like to sell in market and prepare 5 lines on it
Monday, August 18, 2014 at 10:41pm

Please check (history-5 Questions)
Please check these and thanks :D 1.A 2.D 3.A 4.(help because i couldnt get it) 5.B ----------------------------------------​-------------------------- 1.What signifies the period known as history? A. There are written records. B. It is a much longer period than ...
Monday, August 18, 2014 at 10:31am

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 ...
Friday, August 15, 2014 at 11:29am

Physics
A certain rain cloud at an altitude of 1.90 km contains 3.20 107 kg of water vapor. How long would it take for a 2.18-kW pump to raise the amount of water from Earth's surface to the cloud's position?
Thursday, August 14, 2014 at 12:29am

Physics
It has been suggested that cylinders rotating about their long axis with dimensions 19 km long and 6.9 km in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall ...
Thursday, August 14, 2014 at 12:28am

Earth Science
A scientific hypothesis can become a theory if? a- the entire scientific community accepts it b- the hypothesis is tested extensively and competing hypothesis are eliminated c- there are no other competing hypothesis d- the hypothesis can be tested at least once My answer is B
Wednesday, August 13, 2014 at 2:49pm

Earth Science
what is the driving force for the movement of the lithospheric plates? a- heat from the sun b- unequal distribution of heat within Earth c- heat in the atmosphere d- unequal distribution of heat from the oceans My answer is B
Tuesday, August 12, 2014 at 1:41pm

Geography
If you were to dig a hole all the way to the center of the Earth and back where would you end up if you were in Indonesia? Mexico? South America?
Sunday, August 10, 2014 at 2:43am

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