Saturday
September 5, 2015

Homework Help: Science: Earth

Recent Homework Questions About Earth

Physics
The weight of an astronaut plus his space suit on the Moon is only 270 N. A. How much do they weigh on Earth, in Newtons, assuming the acceleration due to gravity on the moon is 1.67m/s^2= 1584is this right? B. What is the mass of the astronaut and his space suit on the moon ...
Wednesday, September 2, 2015 by Flo

science
A boy runs a 100meter distance race in 20seconds as measured by an observer on earth.how long does it take according to an observer in space ship moving with speed of 0.98c for the boy to complete the run? What is the length of the track according to the moving observer?
Wednesday, September 2, 2015 by euro

physics(relativity)
A boy runs a 100m distance in 20s as measured by an observer on earth.how long does it take according to an observer in space ship moving with speed of 0.98c for the boy to complete the run? What is the length of the track according to the moving observer
Wednesday, September 2, 2015 by ebraheem

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, August 31, 2015 by Anonymous

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, August 31, 2015 by Anonymous

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, August 31, 2015 by Anonymous

physics
1.will hall voltage be same for conductor and semiconductor in hall effect experiment? 2.can hall effect experiment be used for determining earth's magnetic field? 3.what is the importance of hall experiment? 4. can we use intrinsic semiconductor for hall experiment?
Sunday, August 30, 2015 by elina

SCIENCE!
i was not taught in my science class any of this, probably a review over 6th grade science, because i learned these in 6th grade.(im in 7th grade now) identifying Errors read the following paragraph and then answer the questions. andrew arrived at school and went directly to ...
Saturday, August 29, 2015 by anon

biology
why is carbon so abundant in living things when oxygen is the most abundant element on earth
Wednesday, August 26, 2015 by ciara

Science
do radioactive elements occur naturally on earth
Monday, August 24, 2015 by brooke

Trigonometry
Two planes are flying at the height of 10-km. They are going at the same speed, and both traveling due north. If the planes are 3,000 km apart as measured along the surface of the earth, what angle do the lines from the planes make to the center of the Earth make?
Monday, August 24, 2015 by April

ss
what are latitude and longitude? lines of __________ and lines __________ cross one another. they form a ____________ around the earth. lines of latitude lines of latitude are also called___________ they circle the earth parallel to the_______ they measure north and south of ...
Monday, August 24, 2015 by ss

Algebra
suppose a pendulum use to show the rotation of the earth has a period of approximately 16.9 seconds. What is the length using formula T=2pi sq root L/32
Sunday, August 23, 2015 by Roslyn

Selamola secondary
What is micro-organism that is regarded as non-living thing and its found only on Earth
Thursday, August 20, 2015 by SETIPA THABO CHUZ LA VIGA

PHYSICS
A hypothetical planet has a mass 1.49 times that of Earth, but the same radius. What is g near its surface?
Monday, August 17, 2015 by Anonymous

Physics
A spaceship is on a straight-line path between the Earth and the Moon. At what distance from (the centre of) Earth is the net gravitational pull on the probe from the Earth and the moon zero? Mass of Earth = 6×10^24 kg. Mass of Moon = 7×10^22 kg. The distance from ...
Friday, August 14, 2015 by Jim

Electrical principles
a. What current is flowing in a 2.0m length of wire in the Earth's field of 55μT if it experiences a force of 10mN? b. A 2 wire cable is suppling 100 A to a DC motor. Each wire has a 2 mm insulation layer and there is also a 2 mm separate insulation layer between the ...
Friday, August 14, 2015 by francis

Physics
What is the speed of a geosynchronous satellite on Earth?
Tuesday, August 11, 2015 by Yoyo

Science
Having trouble with the independent and dependent variable in an if then statement. "If root growth is related to gravity, then roots will always turn toward the earth regardless of a seed's orientation."
Monday, August 10, 2015 by Brandi

Physics
A spaceship is on a straight-line path between the Earth and the Moon. At what distance from Earth is the net gravitational pull on the probe from the Earth and the moon zero? Mass of Earth = 6×10^24 kg. Mass of Moon = 7×10^22 kg. Can someone please confirm if my ...
Sunday, August 9, 2015 by Yoyo

physics
light from the sun travels 1.5x10km to reach the earth .how long does it journey take in minutes?
Sunday, August 9, 2015 by rob

Physics
Just reposting. A spaceship is on a straight-line path between the Earth and the Moon. At what distance from Earth is the net gravitational pull on the probe from the Earth and the moon zero? Mass of Earth = 6×10^24 kg. Mass of Moon = 7×10^22 kg. The distance from ...
Saturday, August 8, 2015 by Yoyo

Physics
If a man weighs 900 N on the earth, what would he weigh on jupiter, where acceleration due to gravity is 25.9 m/s^2?
Friday, August 7, 2015 by Godwin

Physics
A spaceship is on a straight-line path between the Earth and the Moon. At what distance from Earth is the net gravitational pull on the probe from the Earth and the moon zero? Mass of Earth = 6×10^24 kg. Mass of Moon = 7×10^22 kg. The distance from the sun to the ...
Friday, August 7, 2015 by Yoyo

science
How are moon observations from space different from moon observations made on Earth? I think there is no deifference.
Wednesday, July 29, 2015 by Nour

Science
Minerals make up most of the rocks on Earth's surface. What are three changes that can cause minerals to form by metamorphism? pressure, temperature, melting temperature, melting, physical makeup temperature, pressure, chemical makeup pressure, physical makeup, melting I ...
Tuesday, July 28, 2015 by Nour

maths
The Weight of an object varies inversely as the square of its distance from the centre of the earth.the weight of a spacecraft is observed to be only a quater of its weight on earth.How far is the spacecraft from the surface of the earth? [take radius of the earth to be 6400km ]
Tuesday, July 28, 2015 by ashong benjamin

science
Florida was once part of Gondwana, which was a supercontinent that later divided into Africa and South America. Which statement best describes this process? Africa and South America go through cycles of dividing and colliding. The continents have been moving throughout Earth&#...
Tuesday, July 28, 2015 by Nour

Physics
A particle is projected from the surface of Earth with a speed equal to 2.4 times the escape speed. When it is very far from Earth, what is its speed? ?km/s
Monday, July 27, 2015 by Anonymous

science
Amanda is holding a compass and notices that the north pole of the compass points toward the north pole of the Earth. She is confused because she knows from her science classes that the north poles of two magnets will repel each other. How can she explain this phenomenon? The ...
Monday, July 27, 2015 by Nour

Physics
Find the gravitational force acting on the Sun by the Earth. Given: Mass of the Sun = 1.99 * 1030 kg Mass of the Earth = 5.98 * 1024 kg Radius of the Sun = 6.96 * 108 m Radius of the Earth = 6.37 * 106 m Distance between the Sun and the Earth = 1.50 * 1011 m G = 6.67 * 10–...
Thursday, July 23, 2015 by Emily

English
We had to read Kennedy's Inaugural Speech: Vice President Johnson, Mr. Speaker, Mr. Chief Justice, President Eisenhower, Vice president Nixon, President Truman, Reverend Clergy, fellow citizens: We observe today not a victory of party but a celebration of freedom--...
Monday, July 20, 2015 by Grace

geology
True or False: Sand dunes are one of the most stable features on the Earth's surface.
Wednesday, July 15, 2015 by michael

SCTD
Physics a satellite orbiting 3.22 times 10 to the 5th power meters above the surface of the earth get the mass of the satellite is 3.80 times 10 to the 4th kilograms what is the weight or gravitational force exerted on the satellite by the earth?
Tuesday, July 7, 2015 by Jason

math
Find the weight of a 60 kg astronaut on earth?
Monday, July 6, 2015 by Aviwe

Science
What are the reasons why human being is considered the most intelligent animal in the earth?
Monday, June 29, 2015 by Emma

physics
show that the weight of an object on moon is one-sixth of its weight on the earth given mass of earth=5.98*10power24kg, radius of earth=6.37*10power6m. given mass of moon=7.36*10power22kg, radius of moon=1.74*10power6m.
Sunday, June 28, 2015 by fatin

Biology
The water cycle is best described by which of the following statements? Water in the atmosphere must be converted to another chemical before animals can use it. The water on earth changes forms as it moves from one reservoir to another.>----- My answer As water moves ...
Sunday, June 21, 2015 by Sara

Biology
Which of the following biomes covers the largest area of earth? tundra marine-----> My answer grassland forest
Sunday, June 21, 2015 by Sara

physics
Two satellites, A and B, are in different circular orbits about the earth. The orbital speed of satellite A is thirty-four times that of satellite B. Find the ratio (TA/TB) of the periods of the satellites. Thank you!
Sunday, June 21, 2015 by Lola

physics
A student of weight 810 N was sent to another planet called Nerdland. If Nerdland has a mass that is 4 X the mass of the earth and a radius that is 1/2 the radius of the earth, what would be the mass in kg of the student when on Nerdland? what would be the weight in N of the ...
Thursday, June 18, 2015 by Anonymous

science
Darren the astronaut traveled to Planet U-427, a planet that is as big as Earth but is half the mass of Earth. What can you say about Darren's weight in this planet?
Wednesday, June 17, 2015 by ej

science
Darren the astronaut traveled to Planet U-427, a planet that is as big as Earth but is half the mass of Earth. What can you say about Darren's weight in this planet?
Wednesday, June 17, 2015 by ej

Science
What is the atmosphere's role in the exchange of gases on Earth?
Tuesday, June 16, 2015 by Victoria

Earth Science
What is the atmosphere's role in the exchange of gases on Earth?
Tuesday, June 16, 2015 by Victoria

L.A.
2.the most likely reason the author includes lines 17-25 is to A:Show how the main one another. B:provide an explanation of the values and rules that existed during the time in which the play is set. C:inform the audience of Jack's secret identity before other characters ...
Wednesday, June 10, 2015 by L.A.

Urgent - physics
Air molecules and dust particles in the atmosphere will scatter sunlight. From a consideration of the position of the sun, estimate the direction of incidence of the sun's rays on the atmosphere. In what direction will an observer on the earth's surface need to look if...
Wednesday, June 10, 2015 by Nick

collocation
1.Analyze the occurrences of collocation used in the below article Puffin Therapy The Atlantic puffin simply vanishes for months at a time. But when it returns to land, the fearless, clown-faced seabird is a sight that soothes the soul of many a bird-watcher. Here they come, ...
Wednesday, June 10, 2015 by Sophia

collocation
1.Analyze the occurrences of collocation used in the below article Puffin Therapy The Atlantic puffin simply vanishes for months at a time. But when it returns to land, the fearless, clown-faced seabird is a sight that soothes the soul of many a bird-watcher. Here they come, ...
Wednesday, June 10, 2015 by Sophia

Geometry
Max is building a spherical model of earth. He is building his model using 2-inch long pieces of wood to construct the radius. The first time he tries to build the model, he uses 3 of the 2-inch pieces of wood end-to-end to make the radius of the model. A.) What is the volume ...
Tuesday, June 9, 2015 by Donna

Science
how many of earth's atmospheres is on you at sea level?
Monday, June 8, 2015 by Rosy

Language Arts Grade 8
This story is, "The Importance of being earnest." Use the excerpt to answer the question. 1) Which sentence from the passage the best expression if the theme? A. "Its's perfectly easy to be cynical." B. "... once a week is quite enough to dine with...
Saturday, June 6, 2015 by Katie

Science
A 13.0 kg block of concrete rests on a 5 cm by 2 cm board. What is the acceleration of the block of concrete here on Earth?
Wednesday, June 3, 2015 by Ally

Algebra
the space shuttle does one full orbit every 90 minutes and the earth is 25,000 miles around. What is the apparent speed of the space shuttle?
Wednesday, June 3, 2015 by Megan

Language Arts
ALGERNON Bring me that cigarette case Mr. Worthing left in the smoking-room the last time he dined here. LANE Yes, sir. [LANE goes out.] JACK Do you mean to say you have had my cigarette case all this time? I wish to goodness you had let me know. I have been writing frantic ...
Wednesday, June 3, 2015 by Alice

geography
WHY ARE WEDDINGS IN VILLAGES PLANNED IN SUMMERS?(WITH RELEVANCE TO THE EARTH'S REVOLUTION)
Wednesday, June 3, 2015 by SAANVI

geography
why are weddings usually planned in summers in villages?(beacause of the earth's revolution).
Wednesday, June 3, 2015 by abc

Physics
Assume that Earth’s magnetic field is every- where perpendicular to the path of a proton and that Earth’s magnetic field has an inten- sity of 4.10 × 10−8 T. What speed would a proton need to achieve in order to circle Earth 1170.0 km above the magnetic ...
Tuesday, June 2, 2015 by Cassandra

Earth science
Hello! Does Jiskha have Earth Science tutors? If not, could someone direct me to a site where I could ask for help? My questions regard finding out specific heat capacity and heat of fusion and heat of vapourization of water. Thank you!
Monday, June 1, 2015 by Lucina

Chemistry
What is the mass of a 4 kg object, A. On the earth (g=-10 m/s/s) B. On the moon (g=-2 m/s/s)
Monday, June 1, 2015 by Clarissa

help please
here is a public debate between the three candidates for the U.S. Senate. During the debate, the topics of oil and energy are addressed. Each candidate expressed their view on the issue: Edgar Eisenhower: "We need to cut our dependence on foreign oil. Instead, let's ...
Saturday, May 30, 2015 by Maria

SCIENCE!! PLEASE HELP!!! CHECK ANSWERS PLZ
1)When evolution was first proposed, which of the following was used as evidence to support the idea? (1 point) A)observations of nature*** B)laboratory experiments C)extensive fossil collections D)genetic sequences 2)How did Darwin and Lamarck differ in their thinking about ...
Tuesday, May 26, 2015 by .....

earth science
_____ currents assist in the transfer of energy from warmer climates to cooler climates
Monday, May 25, 2015 by dustin

Biology
Based partially on his comparative studies of the fossils of woolly mammoths and the bones of modern-day elephants, Georges Cuvier proposed several new ideas about the history of life on earth. Which general statement can be made about this example? Through specific studies, ...
Friday, May 22, 2015 by Sara

English
Read the sentence from "Zoos: Joys or Jails?" Which best describes the author? "Though zoos are meant to be a joy to viewers and teach lessons about our earth, the zoo jails its inhabitants and passes on faulty knowledge. The wild animals in our world are a ...
Friday, May 22, 2015 by rainbow2015

Science- 8th grade- please help!!
1) What evidence is there that the human species has been successful so far? Explain. 2) What environmental pressures in the past do you think were most important in shaping the human species as it exists today? 3) What environmental pressures exist now that you think may be ...
Thursday, May 21, 2015 by Savannah H

science
1. How is an area’s topography determined? (1 point) 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, and latitude 2. How do ...
Wednesday, May 20, 2015 by .... :)

please help asap
can u help and give me feedback please Literary Analysis of Song of Becoming. Song of Becoming by Fadwa Tuqan is talking about growing up. Becoming legends. It’s about what happens after growing up. It starts off with “…they are only boys who used to frolic and ...
Tuesday, May 19, 2015 by kate

english
i need help checking this paper can you please give me feedback Literary Analysis of Song of Becoming. Song of Becoming by Fadwa Tuqan is talking about growing up. Becoming legends. It’s about what happens after growing up. It starts off with “…they are only ...
Tuesday, May 19, 2015 by kate

Science
1.A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point) A.frequency and wavelength B.wavelength and wave speed C.amplitude and wavelength D.amplitude and frequency 2. ...
Tuesday, May 19, 2015 by Tom

English
1.Which of the following is used when political candidate highlights his or her experience in finance as the basis of a plan for economic recovery? A.Ethos B.Pathos C.Logo***** 2. Identify the sentence that most strongly relies on emotional language. A. It took a lot of work, ...
Tuesday, May 19, 2015 by Cassie

science (any tutor)
Very few fossils of jellyfish or their close relatives have been found. This makes it hard to trace the evolutionary history of jellyfish using the fossil record. What explains this? A. Jellyfish fossils are buried deep under the ocean floor, not in land areas where scientists...
Monday, May 18, 2015 by Anonymous

algebra
The distance D , in miles to the horizon from an obsever's point of view over water or flat earth is given below , where H is the height of the point of view in feet . if a person whose eyes are 5ft above ground level is standing at the top of hill 45 ft above 'flat&...
Saturday, May 16, 2015 by Ann

Language Arts
I have 6 questions but the story "the importance of being earnest" Act 1, Sence 1 1.which sentence best reveals the theme of this passage? A: "more than half of modern culture depends on what one shouldn't read." B: "the truth is rarely pure and ...
Saturday, May 16, 2015 by Gummy Bears

math
2.If a sledgehammer that weighs 18 newtons on Earth will weigh about 4 newtons on the planet Namar, then your weight on Namar would be about ___ times your weight on Earth. A. 0.25 B. 4 C. 0.5 D. Not enough information
Thursday, May 14, 2015 by Julia

biology o science
Very few fossils of jellyfish or their close relatives have been found. This makes it hard to trace the evolutionary history of jellyfish using the fossil record. What explains this? (1 point) Jellyfish fossils are buried deep under the ocean floor, not in land areas where ...
Thursday, May 14, 2015 by claudia 2015

English
1. Which of these lines contains the clearest example of dialect in poetry? A.) "I'll get a blessin' wi' the lave..." B.) "By the stream & o'er the mead..." C.) "To such a deep delight 'twould win me..." D.) "But oft, in ...
Thursday, May 14, 2015 by Cassie

Physics
A satellite of the Earth has a mass of 1550 kg. It orbits Earth with a mean radius of orbit of 7.00 x 10^6 m. a) What is the gravitational potential energy of the satellite with respect to Earth?
Thursday, May 14, 2015 by john

Science: Space
I'm having trouble finding the answers to these fill-in-the-blank questions: Our understanding of the solar system has changed from an Earth-centered model of ____ and ____ to the sun centered model of _____ and _____. I was thinking for the first 2 blanks: rocks; oxygen ...
Wednesday, May 13, 2015 by Anonymous

English
Are these right? IF not please help me understand them thank you. Identify the sentence that most strongly relies on emotional language. It took a lot of work, but we finally got the job done. With hard work and dedication, we got the job done.** We had to move heaven and ...
Wednesday, May 13, 2015 by Missy

science please help
in evolutionary terms, RNA is thought to have preceded proteins and DNA. Which of the following observations provides the most convincing support for hypothesis? a) there are more types of RNA than there are DNA b) RNA contains combined catalytic, structural, and genetic ...
Wednesday, May 13, 2015 by john

math
Q2. An agriculture field is rectangular,with dimensions 100m by 42m.A 20m deep well of diameter 14m is dug in acorner of the field and the earth taken out is spread evenly over the remaining part of the field. Find the increase in the level of the field.
Wednesday, May 13, 2015 by tarekegn

math
A40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form aplateform of dimension 28m by 22m.find the height of the platform.
Wednesday, May 13, 2015 by tarekegn

Physics
If a small planet were discovered whose orbital period was twice that of Earth, how many times farther from the Sun would this planet be? The answer for this one is 1.6 earth radii, but I can't seems to get solution to find the answer. I would appreciate for any hint or help.
Tuesday, May 12, 2015 by john

English
Do I need parentheses or dashes in this sentence? Copernicus as you might know. decided that the earth travels around the sun.
Monday, May 11, 2015 by Kelley

physics questions
1. The batteries in a digital alarm clock provide a terminal voltage of 9 V. What is the potential difference across the entire clock current? A. 4.5 V B. 18.0 V C. 9.0 V D. 6.0 V **C is my answer 2. Why does the earth have a magnetic declination? a. the earth's axis of ...
Monday, May 11, 2015 by nnd

Physics
Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is whisked away in a space ship at 90% of the speed of light. After 65 years they are reunited. Will they look the same? Show proof of your answer through ...
Sunday, May 10, 2015 by Brian

Science
one year ago How many Global Positioning System (GPS) satellites are required to pinpoint your location on Earth’s surface? (1 point) 24 12 3 5 i think it's 4, but 4 is not an option
Saturday, May 9, 2015 by Elliot

physics
If a small planet were discovered whose orbital period was twice that of Earth, how many times farther from the Sun would this planet be?
Saturday, May 9, 2015 by Jon

Physics
The speed of light is about 3.00 x 10 to the power of 5 km/s. It takes approx. 1.28 seconds for light reflected from the moon to reach Earth. What is the average distance from Earth to the moon? Thank you
Friday, May 8, 2015 by Steph

Science, check answers please
When a fan is turned on, it changes electrical energy into ____________ energy. -Motion** -Magnetic -Gravitational -Electromagnetic An experiment discovered that a particular material was a poor conductor of electricity. This material would most likely be used as a(n) -...
Friday, May 8, 2015 by Umacblackbelt

Physics
The space shuttle releases a space telescope into orbit around the earth. The telescope is traveling at a speed of 1700m/s in 25 seconds. What is the distance of the satellite? d = v x t d = 1700 x 25 = Is that the correct formula? Thank you.
Friday, May 8, 2015 by Steph

physics
Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 521 nm, determine the number of photons per second per square meter that reach the earth.
Wednesday, May 6, 2015 by selu

Science
Are these answers correct? 1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere**** Chromosphere Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar ...
Wednesday, May 6, 2015 by Emily

Science
WHICH SYSTEM HAS THE GREATEST TIDAL EFFECT? EARTH-SUN OR EARTH-MOON?
Tuesday, May 5, 2015 by Blake

science
Earth's energy sources include both nonrenewable and renewable resources. Name at least three sources of energy that could be used in your house. The describe the ideal energy source for generating most of your home's electricity, and explain why you chose that source...
Tuesday, May 5, 2015 by Bob

functions
A person’s weight, w, on a planet of radius r is given by: w= kr^-2 k < 0 where the constant, k, depends on the masses of the person and the planet.What fraction of the Earth’s radius must an equally massive planet have for a person to weigh ten times more on that...
Tuesday, May 5, 2015 by Rajab

physics
The length of a moving spaceship is 27.0 m according to an astronaut on the spaceship. If the spaceship is contracted by 14.5 cm according to an Earth observer, what is the speed of the spaceship? I know L=27m and delta L= 0.145 so our contracted length is 26.855 so what ...
Monday, May 4, 2015 by Robby

Earth Science
the magnification of a telescope is changed by changing what? my answer is the eyepiece
Sunday, May 3, 2015 by Steve

Science
On what sides does a "bulge" in the earth's oceans appear on the earth?
Sunday, May 3, 2015 by Kim

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Homework Help: Science

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