Monday
February 20, 2017

Homework Help: Science: Earth

Recent Homework Questions About Earth

Physics
which of the following is NOT true about the path of a cannon ball launched horizontally from the earth's surface if air resistance is neglected? a. the cannnonball has a uniform horizontal velocity b.the total velocity of the cannon ball increases as a function of time c.the ...
Monday, February 20, 2017 by Anonymous

physics
The Earth is 150 million km from the sun. It completes one orbit in a period of approximately 365.25 days. Calculate the orbital speed of Earth in km/hour. please helpppp
Monday, February 20, 2017 by loral

science
a body is released from the great height and falls freely towards the earth . another body is released from the same height , one second later . then the separation between the two bodies , two seconds after release of the second body is
Sunday, February 19, 2017 by farha

Science
The words to use are: crust, moving, lithosphere, asthenosphere, upper mantle, volcanoes, semisolid The ___1___, which includes the ___2___ and part of the ___3___, is divided into plates that carry all of Earth's lands and oceans. These plates float on a ___4___ layer of rock...
Thursday, February 16, 2017 by Ari

Physics (Magnetism)
In an experiment on the shuttle, an electron with a speed of 6.3 x 105 m/s [N] and a mass of 9.11 x 10-31 kg is shot through an external magnetic field. Determine the strength and orientation of the magnetic field required so that the electron's direction of travel remains ...
Thursday, February 16, 2017 by Kim Tuan

Scienc
2. A 2,500 kg car moves at 15 m/s2; 15 m/s2 is the _________ of the car A. Acceleration B. Force C. Velocity D. Speed** 3. Two people are pushing a couch from opposite sides. One person is pushing to the right with a force of 3 N. The other person is pushing to the left with a...
Thursday, February 16, 2017 by Nicole

Earth Science
Slide 1 This is a cumulus cloud. Can you find four things on the word list that you can use to describe this cloud. Cumulus clouds consists of puffy tops, no rain expected, 3,000 ft. high, and flat bottoms. Slide 2 This is an example of towering cumulus clouds. Write down as ...
Thursday, February 16, 2017 by Sam

Science and Hurry!
What causes land breeze and sea breeze? A) The differential heating of land and sea by the Sun results in the movement of air. B) Hot air from the sea blows over the land because there is a high pressure area over the sea. C) Cold air blows from the land over the sea because ...
Thursday, February 16, 2017 by JT

S S PLEASE HELP PLEASE
Some Polynesian islands are ring-shaped coral islands that surround a body of water, or (1 point) • copra. • coral. • atolls. • plates. 2. In the mid-1800s, what event played a part in the large increase in British immigration to Australia? (1 point) • Aborigines ...
Thursday, February 16, 2017 by foxiecold

Science, please! help!
1. How does sea-floor spreading occur? a.New materials are being added to the atmosphere. b. Earthquakes break apart the ocean floor. c. Sediments accumulate at the area of spreading. d. Molten material beneath Earth's crust rises to the surface. 2. Which feature form the ...
Wednesday, February 15, 2017 by Vanessa P.

Physics
Hi, I'm stuck with the following question: The acceleration due to gravity on Mars is only 3.75m/s^2. You would like to modify an antique grandfather clock so that it would still keep accurate time on Mars. If the length of the pendulum on Earth is l, what should the length of...
Tuesday, February 14, 2017 by Grace

physics
calculate angular momentum and rotational kinetic energy of earth about its own axis
Monday, February 13, 2017 by Anonymous

physics
A ball is let fall from a hight h0.There are n collisions with the earth . If the velocity of rebound after n collisions is vn and the ball rises to a hight hn , then coefficient of restitution e is given by ,
Sunday, February 12, 2017 by dharmapal

algebra
Astronomers measure large distances in light-years. One light-year is the distance that light can travel in one year, or approximately 5.88 *10^12 miles. Suppose a star is 3.2 * 10^2 light-years from Earth. In scientific notation, approximately how many miles is it? 1.88 * 10^...
Friday, February 10, 2017 by Lost

Science
The force of gravity of objects on the moon is approximately one-sixth of their value on Earth. Joe's weight on the moon is 124 N. What will Joe's mass on Earth be?
Friday, February 10, 2017 by Jessica

Science
The force of gravity of objects on the moon is approximately one-sixth of their value on Earth. Joe weighs 7633 N on earth. What will Joe's mass on the moon be?
Friday, February 10, 2017 by Jessica

Science
Which of earth's spheres contains mountains,valley's, and other landscapes?
Thursday, February 9, 2017 by Mike

SCIENCE asap :P
Twice a year on Earth, the number of hours of darkness is equal to the number of hours of sunlight. These events, where both day and night are 12 hours, are the spring and autumn equinoxes.Which of these describes the orientation of the sun and Earth on these two days? A.Earth...
Thursday, February 9, 2017 by coolguy123

Earth Science
1. We start with 400 atoms of Uranium-238. How many remain after 4.5 billion years? _______ After 9 billion years? _______ After 13.5 billion years? ________ 2 . How long will it take for ½ of the original amount of Rubidium-87 to decay? _______ 3. Carbon-14 has a half-life ...
Wednesday, February 8, 2017 by 아, 깹송~

English
A character who is depicted realistically and has his or her own personality and history in a story is what type of character? A. Individuated B. Main == C. Modern D. Representative Which of the following is not considered a level of setting in a story? A. Supernatural B. ...
Tuesday, February 7, 2017 by Anonymous

Science
Physics A scientific instrument weighing 98 pounds on the Earth is transported to another planet whose mass is 1.7 Earth masses and whose radius is 0.7 Earth radii. What does this instrument weigh on this planet? To be graded correctly, enter the new weight in pounds (numbers ...
Monday, February 6, 2017 by Erika

Geometry
A sailboat is heading directly north at a speed of 16 knots (1 knot = 0.514 m/s). The wind is blowing towards the east with a speed of 10.4 knots. (Both velocities are given relative to the Earth.) Determine the magnitude and direction of the wind velocity as measured on the ...
Friday, February 3, 2017 by Ellie

Science
Carrying capacity is the maximum number of ___________ that an ecosystem can support 1.different species 2.individuals in a population**** 3.habitats 4.limiting factors In an island ecosystem, a species of beetle feeds on leaves of a shrubby plant. A species of songbird preys ...
Friday, February 3, 2017 by Anonymous

Geologic Time and Earth's History Unit Te
1. An example of a geologic event that could be recorded in rocks is ____. a civil war the occurrence of sun spots a volcanic eruption a lunar eclipse 2. "The present is the key to the past." This statement rephrases the ____. principle of cross­cutting relationships law of ...
Thursday, February 2, 2017 by WhiteRain

physics
what is gravitational field of the earth?
Thursday, February 2, 2017 by kavya

physics
with what velocity must a body be thrown from earth surface so that it may reach a height 4Re the earth surface. given Re=6400km g=9.8m/s
Thursday, February 2, 2017 by kavya

physics
The earth spins on its axis once a day and orbits the sun once a year (365 1/4 days). Determine the average angular velocity (in rad/s) of the earth as it (a) spins on its axis and (b) orbits the sun. In each case, take the positive direction for the angular displacement to be...
Wednesday, February 1, 2017 by Tyler

Science
During a lunar eclipse, does the Moon enter the Earth’s shadow from the east or the west? Explain your answer. Wouldn't it be the east because that's the same way the moon rises normally? So if it normally rises in the east it would do that again.. or would it be west ...
Wednesday, February 1, 2017 by Mykayliah

Literature
which of the following lines from song of becoming best supports the response selected above? A:"Facing sullen tanks with streams of stones. B: Dueling with branches, pretending to be great heroes in history. C: They grown to become trees, plunging deep roots into the earth...
Tuesday, January 31, 2017 by Mills

science
The orbits of planets being elliptical was one the planetary laws developed by ==A. Kepler. B. Brahe. C. Ptolemy. D. Copernicus. If a car travels from Town A to Town B on one road at different speeds and stops at red lights, knowing the distance between the towns and the ...
Tuesday, January 31, 2017 by Check answers please

Math
A variable star is one whose brightness alternately increases and decreases. Lists of variable stars can be found online, and many occur in familiar constellations visible with the naked eye. One such star, R Hydrae, has an average magnitude rating of 7.2 but its magnitude ...
Tuesday, January 31, 2017 by Meenu

math
Describe the points on the earth’s surface that are visible to a viewer who is 100 miles above the North Pole. Would it be half of the surface area of Earth?
Tuesday, January 31, 2017 by Helen

Science
The (blank) has given scientists information about past life on Earth.
Monday, January 30, 2017 by Aaron

Earth Science
What are the maximum and minimum dimensions (the size range) for the following particle sizes? a) cobble: b) pebble: c) sand: PLEASE HELP
Sunday, January 29, 2017 by Maya

Math show work
If a hypothetical planet in our Solar System had a sidereal period of 11.1 Earth years and a circular orbit, how far from the Sun in Astronomical Units would it be? Enter your answer to the nearest 0.01 AU.
Saturday, January 28, 2017 by help

Math
If a hypothetical planet in our Solar System had a sidereal period of 11.1 Earth years and a circular orbit, how far from the Sun in Astronomical Units would it be? Enter your answer to the nearest 0.01 AU.
Saturday, January 28, 2017 by johhny 5

physics
IF a particular galaxys has a total mass of 10 to the 56 grams and the average star in that galaxy has a mass of 10 to the 35 grams, approximately how many stars are there in that galaxy? Give your answer to the nearest whole power of 10 by entering the exponent only. A ...
Saturday, January 28, 2017 by arias

Math
If an object which weighs 100 lbs on the Earth's surface were placed on a planet with 2 times the radius of the Earth and with 7 times the Earth's mass, how much would that object weigh? Enter answer to nearest 0.1 lbs. The term "void ratio" means the ratio of the volume of ...
Saturday, January 28, 2017 by james bond

physics
1.A certain spacecraft is 3.3 AU (Astronomical Units) from Earth. How long in seconds does it take for a signal to reach the Earth after it is transmitted from the spacecraft? Hint: An AU is about 149.9 Million Km, and light moves at 299,800 Km/s. {Indicate your answer to the ...
Saturday, January 28, 2017 by jere

English
What is the meaning behind this quote: you've gotta dance like there's nobody watching love like you'll never be hurt sing like there's nobody listening and live like it's heaven on earth
Tuesday, January 24, 2017 by Andy

Astronomy
1. How did the geocentric model explain the retrograde motion of planets? A. Earth moves faster in its orbit and passes the other planets. B. The planets move backward when they get too close to earth. C. The planets travel in circles as they move around earth in a circle. D. ...
Monday, January 23, 2017 by M

Physics
Many astronomers argue that the Earth and Moon should be considered a double planet,since the gravitational force by the sun on the Moon is approximately as big as that by the Earth on the moon.Using the data below for the Earth and Moon at the particular point in their orbits...
Saturday, January 21, 2017 by Abdurhman

Physics 20
Astronomers launch a satellite to explore a nearby asteroid that has come dangerously close to the earth.The satellite begins orbit around the earth,with an orbital radius 6.85 X 10^3 Km, before being moved to an orbit about the asteroid with a period of 9.06 X 10^3 S at a ...
Saturday, January 21, 2017 by Abdurhman

Physics 20
Astronauts in orbit appear to be 'weightless'.Suppose an astronaut with a mass of 154 KG including gear is in orbit in the space shuttle, a distance of 222 km above the Earth;s surface.Taking the Earth's radius to be 6371km, and its mass to be 5.97 X 10^24, A) What is the ...
Saturday, January 21, 2017 by Abdurhman

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 taking ...
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 you solve this?
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=14.63⋅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 approximated by the model ...
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 5 rad per second
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 is ...
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 and ...
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 direction is due north which is ...
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

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Homework Help: Science