Friday
January 20, 2017

Homework Help: Science: Earth

Recent Homework Questions About Earth

eng
the primary purpose to al gore's an inconvenient truth is a. to inform the readers that there is environmental hazard in burning fossil fuels b. to entertain readers with stories from his college days and his professor's quotations c. to persuade the readers that by ...
Thursday, January 19, 2017 by help

Physics
A helicopter is ascending vertically with a speed of 5.20 m/s. At a height of 125 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the helicopter's.]
Thursday, January 19, 2017 by Jay

Science
Which of these statements are true? A. There is more water on Earth now than there was millions of years ago. B. There is less water on the Earth than there was millions of years ago.(MY ANSWER) C. There is no way to tell how much water there was on Earth millions of years ago...
Thursday, January 19, 2017 by Millicent

Chemistry
Write the symbol for the elements that fit the following descriptions 1. 10 electrons in each -3 ion 2. 18 electrons in each +2 ion 3. The alkaline earth metal in the third period
Wednesday, January 18, 2017 by Marissa

English
Description: does anyone has teas 6, the new version , passage about new York central park, earth cousin, or time management , if i anyone has it let me know am willing to pay anything for it
Tuesday, January 17, 2017 by Soso

physics
The mass of the Earth is 5.98 × 1024 kg. A 6.83 kg bowling ball initially at rest is dropped from a height of 2.12 m. The acceleration of gravity is 9.8 m/s^2. What is the speed of the Earth coming up to meet the ball just before the ball hits the ground? How do ...
Monday, January 16, 2017 by Jazz

Dynamics
A level fight bomber flying at 300 ft/s releases a bomb at an elevation of 6400 ft. Approximately how long before the bomb strikes the earth?
Sunday, January 15, 2017 by Angel

IPC
The value of acceleration due to gravity (g) on a point 10,000 kilometers above sea level is about 1.49 meters/second2. How much will an object, which weighs 98 newtons on the surface of Earth, weigh on this point? The value of acceleration due to gravity on Earth is 9.8 ...
Wednesday, January 11, 2017 by sam

Maths
The speed of a point A due to the rotation of the earth is twice that of a point B.If A is on latitude 22°N.calculate the latitude of B
Wednesday, January 11, 2017 by Realone

Earth science
Most of the sand that makes up the sandstone found in New York State was originally deposited in which type of layers?
Tuesday, January 10, 2017 by Anonymous

Physics
the orbital period of the moon is 27.32 days. The international space station has an orbital period of 90 minutes. What is the mean distance between the center of the earth and the center of the international space station? moons orbital radius: 25,201
Monday, January 9, 2017 by Anonymous

Math, Physics
Calculate Earth's gravitational force on the ISS astronauts while orbiting at an altitude of 401.5 km above Earth’s surface.
Monday, January 9, 2017 by Hooman

Maths
I posted yesterday but feel I confused the issue with an incorrect calculation of an angle, I have just realised my mistake!. I also think I should come clean about my circumstances. I am a mature (very) student, in fact a retired commercial fisherman and am studying celestial...
Thursday, January 5, 2017 by Mike

LA
PLEASE check my answer this is my last test and i d not want to mess up PLEASE 1. Which sentence contains an opinion? (1 point) Thomas Jefferson supported American independence from Great Britain. He was a lawyer in his home state of Virginia. Jefferson authored the ...
Thursday, January 5, 2017 by Michael

math
p=14.63â‹…0.8 Atmospheric pressure, measured in pounds per square inch p, s, i is the force exerted by Earth's atmosphere over a given area. The atmospheric pressure, p, exerted on an airplane flying at an altitude of a miles above sea level can be ...
Wednesday, January 4, 2017 by ryn

science
An astronauts boots weigh 100N on earth where the acceleration of free fall is 10m/s2. How much will they weigh on Mars where the acceleration of free fall is 4m/s2?
Sunday, January 1, 2017 by watson

science
An astronauts boots weigh 100N on earth where the acceleration of free fall is 10m/s2. How much will they weigh on Mars where the acceleration of free fall is 4m/s2?
Saturday, December 31, 2016 by watson

Chemistry
Which of the following is true about oxidation reactions? A. Oxidation reactions are the principal source of energy on Earth. B. All oxidation reactions are accompanied by reduction reactions. C. The burning of wood in a fireplace and the metabolization of food by your body ...
Wednesday, December 28, 2016 by sophia

science
if yourweight is 60N on earth,how far should you go from the center of the earth so that your weight will be 300N
Monday, December 26, 2016 by kashi dhakal

Pre-calc Math
The path of a satellite orbiting the earth causes the satellite to pass directly over two tracking stations A and B, which are 95 mi apart. When the satellite is on one side of the two stations, the angles of elevation at A and B are measured to be 87.0° and 84.2&...
Friday, December 23, 2016 by Anthony

physics
A geostationary satellite for communications seems to be in a fixed spot above the equator because it has the same angular velocity as the earth.A) show that if it goes round once a day,its angular velocity is a little over 7×10 race to negative...
Thursday, December 22, 2016 by And

Social Impact of Technology
Which of these planets is in the so-called “Goldilocks Zone”? A. Earth B. Mars C. Jupiter D. Venus Ans: Earth
Wednesday, December 21, 2016 by Angela

physics
At ground level g is 9.8meter per second square. Suppose the earth started to increase its angular velocity. How long would a day be when the people on the equator were just 'thrown off' why is the expression thrown off is a bad one?
Tuesday, December 20, 2016 by Andy

Writing Essay 5th grade
Hello, I got an assignment writing persuasive essay why we should save water? Could plz check my essay and guide me if I need to change anything. Thank You for your help. Why we should save water. (Persuasive Essay) Have you wondered why we should save water and how we can ...
Monday, December 19, 2016 by Jay

Science
This is part two of my science I answered the other one just need to be checked on this one and the other one. 10. _________ is the most plentiful fossil fuel in the United States A:Natural Gas B:Coal C:Oil D:Petroleum 11. What is the result of fossil fuels being used more ...
Monday, December 19, 2016 by Reeces

Physics
At ground level g is 9.8m/s^2. Suppose the earth started to increase its angular velocity. How long would a day be when people on the equator were just 'thrown off'? Why is the expression 'thrown off' a bad one ?
Saturday, December 17, 2016 by Yesuf

Physics
At ground level g is 9.8m/s^2. Suppose the earth started to increase its angular velocity. How long would a day be when people on the equator were just 'thrown off'? Why is the expression 'thrown off' a bad one?
Saturday, December 17, 2016 by Yesuf

Science
1.Which of these is an example of a biomass fuel? A:Oil B:Natural Gas C:Wood D:Coal 2.The intense heat from Earth's interior that warms the magma beneath the Earth's surface is called __________ energy? A:Hydroelectric B:Geothermal C:Nuclear D:Solar 3.Selective cutting...
Friday, December 16, 2016 by Reeces

HELP SCIENCE
Luis created a clay model of earth and the sun to show how earth rotates, Luis wants to use a toothpick to represent earths axis of rotation Where should he put the toothpick A - horizontally through earth in the direction earth is traveling B - vertically through the center ...
Thursday, December 15, 2016 by Unicorn

physics
A. how long will it take for a 55.0 kg steel brick to fall 75 meters on earth. A. how far from the base will a 55.o kg steel brick to land,(horizontally) if it dropped a vertical distance of 75 meters on earth, and what is its velocity just before it hits the ground?
Thursday, December 15, 2016 by grace

HELP!
Earth's inner core exists at temperatures as high as 7000oC. It exists as a _______ due to the _________. A) solid; high pressure B) liquid; high pressure C) solid; high temperature D) liquid; high temperature
Wednesday, December 14, 2016 by Lucy

Science
How much you would weigh on the moon if you are 72 pounds on Earth
Wednesday, December 14, 2016 by Anonymous

math
The well is dug 14m deep. Its radius is 2m. The earth dug out is evenly spread out on a rectangular field of dimensions 10m*4m. Find the height of the platform raised.
Monday, December 12, 2016 by aditi

Science physics
what will be the acceleration due to gravity at up planet whose mass is 8 times the mass of the earth and whose radius is twice that of the earth? g=10
Monday, December 12, 2016 by Ankit

physics
a stone that is thrown near the surface of the earth. There is no air resistance. Position increases in the up direction. The initial velocity is 30 m/s at 30 degrees above the horizontal. what is the velocity when the stone reaches its maximum height ? what is the ...
Monday, December 12, 2016 by Mable

Chemistry
If an astronaut weights 804n on earth what would he weight on a planet that has 3 times the mass and twice the radius of earth
Monday, December 12, 2016 by William

Science
Which statement best describes a spring tide? A - The periodic rise and fall of the water level in the oceans B - the tide if maximum range that takes place two times a month C - the difference in levels of ocean water at high tide and at low tide D - a rise in ocean water ...
Sunday, December 11, 2016 by Unicorn

Science
Luis created a clay model of earth and the sun to show how earth rotates, Luis wants to use a toothpick to represent earths axis of rotation Where should he put the toothpick A - horizontally through earth in the direction earth is traveling B - vertically through the center ...
Sunday, December 11, 2016 by Unicorn

Science
Cassie is writing an equation to show the effect of gravitational pull of the sun and moon on tidal range which equation would Cassie use to show the effect of the sun and the moon on Spring tides? A - sun + moon = spring tides B - sun + Earth = spring tides C - moon - sun = ...
Sunday, December 11, 2016 by Unicorn

Science
Cassie is writing an equation to show the effect of gravitational pull of the sun and moon on tidal range which equation would Cassie use to show the effect of the sun and the moon on Spring tides? A - sun + moon = spring tides B - sun + Earth = spring tides C - moon - sun = ...
Saturday, December 10, 2016 by Unicorn

Science
Luis created a clay model of earth and the sun to show how earth rotates, Luis wants to use a toothpick to represent earths axis of rotation Where should he put the toothpick A - horizontally through earth in the direction earth is traveling B - vertically through the center ...
Saturday, December 10, 2016 by Unicorn

Science
Which statement best describes a spring tide? A - The periodic rise and fall of the water level in the oceans B - the tide if maximum range that takes place two times a month C - the difference in levels of ocean water at high tide and at low tide D - a rise in ocean water ...
Saturday, December 10, 2016 by Unicorn

Science
The Northern Hemisphere recives more solar energy during one half of the year than it does during the other half of the year. Which of the following happens during the year to explain this? A - the distance of the northern hemisphere from the sun changes B - The Angle at which...
Saturday, December 10, 2016 by Unicorn

Kumar
What is the life of earth ? explain and why?
Saturday, December 10, 2016 by Raj

Geography
How was the earth formed?
Saturday, December 10, 2016 by Brajesh

Astronomy
Hi, can you please check my work? I really need to do well on this. 1. What properties of a star are needed to calculate the stars luminosity? a. size and apparent brightness b.mass and distance to the star**** c. temperature and diameter of the star d. apparent brightness and...
Friday, December 9, 2016 by Elle

Math
The approximate distance of the moon from Earth is 4 x 105 km and the average approximate distance from the Earth to Venus is 4 x 107 km. How much farther is Venus from Earth than the moon?
Thursday, December 8, 2016 by Lucy

Science
The force of gravity on an object on the surface of Mars is less than the force of gravity on an identical object on the surface of Earth. Which of the following explains why this is true?
Thursday, December 8, 2016 by JP

Science
why are lunar rocks used to determine the age of a earth.
Tuesday, December 6, 2016 by Sincere Boxley

art
My internet is down for my computer and I can only use data. I can't go back for my notes 1. This drawing was made using what natural resource? (1 point) A. harvesting the clay from a corn plant B. making the clay from water and pigments C. making the clay by mixing sand ...
Tuesday, December 6, 2016 by Kate

Science. Answer Check
1. A student studying a circuit diagram of a lightbulb, battery, and a switch correctly identifies it as a closer circuit. In this diagram, The lightbulb would be a. an insulator b. on*** c. disconnected d. off 2. The focus of gravity on an object on the surface of Mars is ...
Tuesday, December 6, 2016 by Jay

Science
What kind of heat transfer cause Earth's major wind patterns?
Monday, December 5, 2016 by Ng

physic
How fast (in meters/second) is an object moving on the earth, if its speed is specified as Mach 0.2 ?
Monday, December 5, 2016 by kassy

physics
Determine the force per meter on a lightning bolt at the equator that carries 20 000 A and is perpendicular to the Earth’s magnetic field, 3x10-5 T. What is the direction of the force if the current is straight up and the Earth’s field ...
Sunday, December 4, 2016 by ainul

8th Grade Science
Which of the following best describes what causes the phases of the moon? A. The alignment of the sun, Earth and moon (I think it's this one) B. The speed of the moon around the Earth C. The speed of the Earth around the sun D. The alignment of the planets
Saturday, December 3, 2016 by Music Lover 14

Social Studies
1. Some Polynesian islands are ring-shaped coral islands that surround a body of water, or copra. coral.>>> atolls. plates. 2. In the mid-1800s, what event played a part in the large increase in British immigration to Australia? Aborigines moved to the outback. ...
Saturday, December 3, 2016 by Lip

physics
Determine the force per meter on a lightning bolt at the equator that carries 20 000 A and is perpendicular to the Earth’s magnetic field, 3x10-5 T. What is the direction of the force if the current is straight up and the Earth’s field ...
Saturday, December 3, 2016 by aishah

Physics
a stationary 25 kg object is located on a table near the surface of the earth. The coefficient of static friction between the surface is 0.50 and of kinetic friction is 0.30.
Friday, December 2, 2016 by Josh

Physics
The crew men in space are discussing whether they can crack a wall nut with a hammer. Man A says that hitting wall nut with a hammer would be no more effective than hitting it with a feather. Because the hammer is weightless in space. Man B says that he found mass of the ...
Friday, December 2, 2016 by Raj

science double check answers
1. What is the alignment of the Earth, moon, and sun during a lunar eclipse? A)Earth, sun, moon B)Earth, moon, sun C)Sun, Earth, moon** D)Sun, moon, Earth I know that for a lunar eclipse the earth is in the middle, so i just wanted to double check 2.A scientific law A)can have...
Thursday, December 1, 2016 by katrina

science
1. What is the alignment of the Earth, moon, and sun during a lunar eclipse? A)Earth, sun, moon B)Earth, moon, sun C)Sun, Earth, moon** D)Sun, moon, Earth I know that for a lunar eclipse the earth is in the middle, so i just wanted to double check 2.A scientific law A)can have...
Thursday, December 1, 2016 by katrina

Physics
Find the orbital speed of a satellite in a circular orbit 3.70×107 m above the surface of the Earth. v = 3030 m/s So I've been trying to solve this problem for some time now and haven't figured it out. What I did is find orbital radius, use that to find ...
Thursday, December 1, 2016 by Alvin

science
1.A scientific law A)can have only one known exception B)can have any number of exceptions as long as we know about them ** C)might have many exceptions we don’t know about D)has no exceptions 2.Sunspots are A) solar storms that can interfere with ...
Thursday, December 1, 2016 by katrina

science
1.A scientific law A)can have only one known exception B)can have any number of exceptions as long as we know about them C)might have many exceptions we don’t know about D)has no exceptions*** 2.Sunspots are A) solar storms that can interfere with ...
Wednesday, November 30, 2016 by katrina

science
I'm stuck on the following questions 1)The geocentric model of the universe states that the Earth is the center of the universe. This is an example of a A)scientific conclusion B)pseudoscience C)scientific law*** D)Scientific method Through process of elimination i know ...
Wednesday, November 30, 2016 by katrina

English
If you had read The Last Judgement could you please help me? God...."The fifth and sixth people were an old married couple;he finished them off with an axe and found practically no money, although they had more than twent thousand hidden away." Kugler jumped up: ...
Wednesday, November 30, 2016 by Anonymous

physics
Suppose a river flows due south with a speed of 2.0 m/s. Given that speed of motorboat relative to water is 4.2 m/s due east. (a) In what direction should the motorboat head to reach a point on the opposite bank directly east from your starting point? (b) What is the velocity ...
Wednesday, November 30, 2016 by Sue

Physics
Any help is appreciated! A grandfather clock is based on the period of oscillation of a pendulum. The clock keeps perfect time on the first floor of the Sears tower but when carefully moved to the top floor h=436 m above the surface of the earth, the clock is found to be slow...
Wednesday, November 30, 2016 by Jamie

Science
A new geosynchronous satellite needs an orbit of 35.7 km . The mass of the Earth is 5.97x 10^24 Kg and the radius of Earth 6.4 x 10^3 km. The mass of the satellite is 200 Kg. What velocity will it need to achieve that orbit
Tuesday, November 29, 2016 by Boberto

Physics
An airplane is flying above the Earth's surface at a height of 10.9 km. The centripetal acceleration of the plane is 16.7 m/s2. What is the angular velocity of the plane moving in uniform circular motion? Take the radius of the earth to be 6400 km.
Tuesday, November 29, 2016 by Uoit student

physics
An airplane is flying above the Earth's surface at a height of 10.9 km. The centripetal acceleration of the plane is 16.7 m/s2. What is the angular velocity of the plane moving in uniform circular motion? Take the radius of the earth to be 6400 km. Please help, I've ...
Tuesday, November 29, 2016 by Uoit student

Science
A new geosynchronous satellite needs an orbit of 35.7 km . The mass of the Earth is 5.97x 10^24 Kg and the radius of Earth 6.4 x 10^3 km. The mass of the satellite is 200 Kg. What velocity will it need to achieve that orbit?
Tuesday, November 29, 2016 by Boberto

Science
The Sun exerts a gravitational force of 3.56 x 10^22 N on Earth. The mass of the Sun is 2.0 x 10^30 kg. The mass of the Earth is 6.0 x 10^24 kg. If we assume the Earth has a circular orbit of 1.5 x 10^11 m, what is the velocity needed for Earth to remain in orbit?
Tuesday, November 29, 2016 by Boberto

Social Impact of Technology
Which of these kinds of energy is a fundamental requisite for life on Earth? A. Electrical energy B. Solar energy C. Chemical energy D. Potential energy An -- C
Monday, November 28, 2016 by Angela

Physics
How much faster would a person be moving if they stood on top of a 18.2 m high building compared to the ground? Take the period to be one day, and the radius of the earth to be 6400 km?
Monday, November 28, 2016 by Impossible

Physics
A 0.1134kg spherical meteor of diameter 3 cm enters the earth’s atmosphere at an elevation of 121920m with a velocity of 13411.2 m/s. The meteor’s temperature is -73.15˚C. The specific heat at constant volume (Cv) of the meteor is...
Monday, November 28, 2016 by Jack

Science , Biology
Cretaceous extinction... The evidence tells you that “overwhelming evidence suggests that the extinction was caused by a 10-km-diameter asteroid that struck Earth.” Suggest at least three lines of evidence that might have led scientists to ...
Sunday, November 27, 2016 by Woo

physics
An airplane is flying above the Earth's surface at a height of 9.30 km. The centripetal acceleration of the plane is 18.2 m/s2. What is the angular velocity of the plane moving in uniform circular motion? Take the radius of the earth to be 6400 km.
Saturday, November 26, 2016 by Please help

Physics
A satellite orbits the Earth in an orbits 750 km high. Find (*) the satellite's orbital speed and (**) period. (The mass and radius of the Earth are 5.98E + 24 kg and 6370000 m, respectively.)
Saturday, November 26, 2016 by Mary

Earth Science
PLEASE HELP! URGENT! 7. Which letter arrows point to hanging valleys? 8. Which letter arrows point to aretes? 9. Name a peak on the map that is a horn. 10. Feature E on the map is composed of glacial till. What type of glacial feature is E, and how did it form?
Friday, November 25, 2016 by Jade

physics
How many minutes would it take a radio wave to travel from the planet Venus to earth?
Tuesday, November 22, 2016 by Musiyab Awan

science
Which of the following will make it harder in the future to develop sustainable methods for humans using resources? 1) there will be fewer renewable resources 2) more humans will populate the earth 3) more humans will recycle mterials
Tuesday, November 22, 2016 by Jaden

physics
suppose the experiment was conducted on the surface of the moon of about 1-6th that of the earth. If a single period takes exactly 1.00 second, how long does a period take on the moon ?
Monday, November 21, 2016 by Briana

Science
1.Which of the following gases was most likely present in Earth's earliest atmosphere? A. nitrogen B. hydrogen* C. argon D. oxygen 2. Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic ...
Monday, November 21, 2016 by help me plss

Science plsss help!
1.Which of the following gases was most likely present in Earth's earliest atmosphere? A. nitrogen B. hydrogen* C. argon D. oxygen 2. Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic ...
Monday, November 21, 2016 by PLease help me 6 science!!

computer science
A GPS satellite develops a fault whereby it moves into an orbit 19 500 km above the Earth’s surface and also emits a weak signal whose power is only 24 W. What will be the power per square metre of the signal received on the Earth’s surface...
Monday, November 21, 2016 by yomi

physics
What is the period (in seconds) of a simple pendulum 62.0 cm. long, on the earth?
Sunday, November 20, 2016 by kassy

ELA
"The Enlightenment and the Scientific Revolution were twin explosions in thinking that made the 17th and 18th centuries one of the most exciting and dynamic eras in European history. People cam to believe the power of human reason apart from the guidance of religion. ...
Friday, November 18, 2016 by Miranda

Physics
Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ...
Friday, November 18, 2016 by BrookeNeed

Physics
An object is projected from a satellite orbiting 200 km above the surface of the earth. The object has a speed relative to the Earth of 2.85×104 m/s. What is its speed when it is very far from the earth?
Thursday, November 17, 2016 by James

Chemistry
How many moles of ozone does the atmosphere hold? For a sense of scale,compare the amount to the total carbon dioxide emitted annually from fossil fuel burning, cement production and deforestation (7900 Tg/C). Given with the facts the amount of ozone is equivalent to a 3mm ...
Thursday, November 17, 2016 by Nayo

Science
What parts of the earth did glaciers cover during the ice age.
Wednesday, November 16, 2016 by Anonymous

science
5. Suppose a skydiver (mass = 75 kg) is falling toward the Earth. When the skydiver is 100 m above the Earth he is moving at 60 m/s. At this point calculate the skydiver’sâ€​;¦â€¦.
Wednesday, November 16, 2016 by jeremiah

ENGLISH HELP PLS
Identify the choice that best describes the sentence. 5. More than 1,000 years passed before Copernicus proposed that the earth orbited the sun. (1 point) a. simple*** b. compound c. complex d. compound-complex *** = my answer
Monday, November 14, 2016 by Chloe

physics
The mass of the Earth is 5.972kg, and the radius of Earth is 6, 371 km. A 750 kg satellite orbits 35, 800 km above Earth in a perfectly circular orbit. 1. If the gravitational force is the centripetal force keeping the satellite in a stable cicular orbit, how does the ...
Monday, November 14, 2016 by LESTER

English
Write an analysis paragraph that answers the overarching question: What is the effect of imagery on the reader’s understanding of the relationship between Orwell and the native Burmese people? I look up examples and step by step and still dont understand. Pls...
Sunday, November 13, 2016 by Emma

Science-please help
What makes the moon rise? a)Alignment of the stars 2) Earth's rotation 3) Moon orbits about the Earth Is the answer (2)?
Sunday, November 13, 2016 by Chimingbell

English
1. I heard the weather is usually windy and foggy on Dokdo. 2. I heard that he is very kind. 2-2. I heard that he was very kind. (What is the difference between them in meaning? Are both okay? Which one is commonly used?) 3. I heard that two times five is ten. 4. I heard that ...
Friday, November 11, 2016 by rfvv

Physics
The orbital period of the moon about the earth is approximately 27.3 days. given that the average earth-moon distance is 384,000 kilometers, predict the moon's speed using the expression for centripetal force and the gravitational force, setting them equal to each other.
Thursday, November 10, 2016 by max

la
la - Connexus CHEAT! - Ms. Sue, Wednesday, November 9, 2016 at 1:59pm You just grievously insulted me! Why on earth do you think I would give you the answers?? Teachers, note: This "student" posted from South Bend. guys how and why would she look where i live i need ...
Thursday, November 10, 2016 by My real name karimya brown

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Homework Help: Science