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Homework Help: Science: Earth

Recent Homework Questions About Earth

Post a New Question | Current Questions

geography
Can you check my answers please? 1. What Russian peninsula is located between the Bering Sea and the Sea of Okhotsk? Kamchatka Peninsula 2. How many degrees of longitude circle the Earth? 360 degrees of longitude 3. What continents are included in the "tropics"? ...
Monday, November 12, 2012 at 7:42pm

Physics B
Part 1 Calculate the magnitude of the linear momentum for each of the following cases: A proton with mass 1.67×10 −27 kg moving with a speed of 5.24 × 10 6 m/s. Answer in units of kg · m/s Part 2 A 15.1 g bullet moving with a speed of 327 m/s. Answer ...
Monday, November 12, 2012 at 5:11pm

English- Hamlet
I got to explain this soliloquie in a paragraph: Spoken by Hamlet, Hamlet Act 1 Scene 2: O, that this too too solid flesh would melt Thaw and resolve itself into a dew! Or that the Everlasting had not fix’d His canon ‘gainst self-slaughter! O God! God! How weary, ...
Sunday, November 11, 2012 at 9:33pm

Physics
A rotating cylinder 7.95 kilometers in radius is designed to be used as a space colony. With what period must it rotate so the residents on it feel as heavy as they would on Earth?
Sunday, November 11, 2012 at 7:35pm

Earth Science
http://eo.ucar.edu/kids/green/cycles6.ht​m
Sunday, November 11, 2012 at 7:24pm

earth
http://www.elmhurst.edu/~chm/onlcourse/c​hm110/outlines/nitrogencycle.html
Sunday, November 11, 2012 at 7:23pm

Earth Science
Explain the Earth's Cabon Cycle
Sunday, November 11, 2012 at 7:21pm

earth
Explain the Nitrogen Cycle
Sunday, November 11, 2012 at 7:20pm

physics
The Earth’s radius is about 6380 km. The space shuttle is orbiting about 275.0 km above Earth’s surface. If the average speed of the space shuttle is 23500 km/h, find the time required for it to circle Earth.
Sunday, November 11, 2012 at 12:49pm

Physics
The velocity required to maintain a circular orbit around the Earth may be computed from the following: Vc = sqrt(µ/r) where Vc is the circular orbital velocity in feet per second, µ (pronounced meuw as opposed to meow) is the gravitational constant of the earth, ~...
Sunday, November 11, 2012 at 11:11am

Physics
A 7410-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...
Sunday, November 11, 2012 at 6:37am

Physics
weight = mg, so, if g doubles, so does weight. so, weight on earth is .85 * (9.8/1.7) = 4.9 N how boring. surely they didn't have to make the values come out so normal.
Saturday, November 10, 2012 at 1:54pm

Physics
The weight of a rock on the moon is 0.85 N. If acceleration due to gravity on the moon is 1.7 m/s2, what will be its weight on the earth
Saturday, November 10, 2012 at 12:53pm

earth
Refer to sources that discuss the Mannong Equatiion, such as http://www.lmnoeng.com/manning.htm Different constants k apply to different situation.
Saturday, November 10, 2012 at 9:55am

earth
You should have been provided with a graph based upon actual data. There is no simple formula to apply to this question. The facts that the stream winds and is weed filled affect the answer. Use the graph provided, or search for one online. I will see what I can find and post ...
Saturday, November 10, 2012 at 9:44am

earth
A winding natural stream with weeds has an average depth of 0.86m and is 7.25m across. The stream channel drops 0.34 m/km. What is the stream’s average velocity?
Saturday, November 10, 2012 at 8:37am

Physics
The weight of a rock on the moon is 0.85 N. If acceleration due to gravity on the moon is 1.7 m/s2, what will be its weight on the earth
Friday, November 9, 2012 at 1:55pm

physics
A 14.7 kg crate is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling force is 124.0 N parallel to the incline, which makes an angle of 11.0 ◦ with the horizontal. The coefficient of kinetic friction is 0.31 and the crate is pulled a distance of...
Friday, November 9, 2012 at 1:00am

physics
During a solar eclipse, the moon (of mass 7.36 × 1022 kg), Earth (of mass 5.98 × 1024 kg), and Sun (of mass 1.99 × 1030 kg) lie on the same line, with the moon between Earth and the Sun. 1.What gravitational force is exerted on the moon by the Sun? The ...
Thursday, November 8, 2012 at 10:56pm

Physics
The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56 s Thanks in advance
Thursday, November 8, 2012 at 9:00pm

Physics
A satellite is to be put into a circular low earth orbit at 149 km above surface. What orbital speed (km/s) is required?
Thursday, November 8, 2012 at 8:40pm

physics
Consider a pulse of laser light aimed at the Moon that bounces back to Earth. The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56 s
Thursday, November 8, 2012 at 8:39pm

physics
Consider a pulse of laser light aimed at the Moon that bounces back to Earth. The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56 s.
Thursday, November 8, 2012 at 7:46pm

Physics
The Earth has an angular speed of 7.272·10-5 rad/s in its rotation. Find the new angular speed if an asteroid (m = 3.45·1022 kg) hits the Earth while traveling at a speed of 4.41·103 m/s (assume the asteroid is a point mass compared to the radius of the ...
Thursday, November 8, 2012 at 4:39pm

Physics Projectile Motion
What angle (from earth) should one shoot a projectile so that it reaches it's maximum?
Thursday, November 8, 2012 at 9:58am

Physics
a) You need the radius of the Earth, Re = 6370 km The orbit radius is then R = Re + h = 6770 km The acceleration of gravity at that altitude is g' = g*(Re/R)^2 = 8.685 m/s^2 Set the gravitational acceleration g' equal to the centripetal acceleration and solve for V V^2...
Thursday, November 8, 2012 at 3:52am

Physics
A 3000kg satellite orbits the Earth 400km above the equator. find a)The speed of the satellite b) The kinetic energy of the satellite c) The potential energy of the satellite d) The total energy of the satellite
Thursday, November 8, 2012 at 3:37am

Physics
Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
Thursday, November 8, 2012 at 3:18am

Physics 3A
Determine the magnitude of the effective value of at a latitude of 60 on the Earth. Assume the Earth is a rotating sphere.
Thursday, November 8, 2012 at 2:10am

Physics
Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
Wednesday, November 7, 2012 at 11:00pm

physics
A 2130-kg space station orbits Earth at an altitude of 455 km. Find the magnitude of the force with which the space station attracts Earth. The mass and mean radius of Earth are 5.98 × 1024 kg and 6370 km, respectively
Wednesday, November 7, 2012 at 8:32pm

Math
This is a neat trick, as Earth is not spherical, the difference in radius at the poles compared to the Equator is 31miles. Ignoring that bit of fact, assuming the Earth is spherical, and there is no atmospheric drag,then period=1day=24hrs*3600sec/hr speed=distancearund/tperiod...
Wednesday, November 7, 2012 at 7:52pm

Math
The radius of Earth is 3,959 miles. A spacecraft orbits 6 miles above the surface of Earth. The spacecraft completes 220° of a revolution around Earth in one day. What is the average speed of the spacecraft?
Wednesday, November 7, 2012 at 7:33pm

Physics
On the Earth mg=GmM/R² In the spacecraft mg'=GmM/(5R)²= {GmM/R²}/25=mg/25 His weight is 50.0/25 =2.0 N
Wednesday, November 7, 2012 at 2:58pm

physics
A satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). The period of the satellite is 4.20 104 s. What is the speed at which the satellite travels?
Wednesday, November 7, 2012 at 2:46pm

physics
In designing rotating space stations to provide for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the negative effects of motion sickness begin to appear when the rotational motion is faster than ...
Wednesday, November 7, 2012 at 2:17pm

Physics
Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
Wednesday, November 7, 2012 at 2:13pm

Physics
If the 50.0 kg boy were in a spacecraft 5R from the center of the earth, what would his weight be? (Use the 50.0 kg boy for significant figures) i got 20N again not sure.. it dosnt tell me if i got them wrong or right online classes are horrible and very confusing
Wednesday, November 7, 2012 at 11:51am

Physics
two satellites are launched from earth to the same altitude. One is twice the mass of the other. How will their periods compare?
Tuesday, November 6, 2012 at 8:14pm

Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated ...
Tuesday, November 6, 2012 at 10:30am

Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated ...
Tuesday, November 6, 2012 at 10:30am

earth science9volcanos0
So it's also like taking a nap.
Monday, November 5, 2012 at 8:26pm

earth science9volcanos0
A dormant volcano is a volcano which is not currently active (that is, not erupting nor showing signs of unrest), but is believed to be still capable of erupting
Monday, November 5, 2012 at 8:25pm

earth science9volcanos0
when a volcano becomes dormant it is...
Monday, November 5, 2012 at 8:20pm

physics
Estimate the energy required from fuel to launch a 1465 kg satellite into orbit 1375 km above the Earth’s surface. Consider two cases: (a) the satellite is launched into an equatorial orbit from a point on the Earth’s equator, and (b) it is launched from the North ...
Monday, November 5, 2012 at 8:06pm

physics
A student on Earth has a mass of 55.5 kg. With how much force does the Earth pull on the student?
Monday, November 5, 2012 at 5:19pm

Chemistry - Please help!
Small quantites of hydrogen peroxide can be prepared by the action of an acid on an alkaline earth metal peroxide, such as barium peroxide. BaO2 (s) + 2HCl (aq) -> H2O2 (aq) + BaCl2 (aq) What mass of hydrogen peroxide should result when 15.0g of barium peroxide is treated ...
Monday, November 5, 2012 at 2:41pm

physics
The average distance separating Earth and the Moon is 384,000 km. A 2.6x104 kg spaceship located halfway between them. (b) What is the total potential energy of the ship?
Sunday, November 4, 2012 at 6:21pm

earth
If you had a mole of M&M's, how many times could you cover the surface of the earth ?
Sunday, November 4, 2012 at 4:39pm

Physics Help, Please
In the final stages of the landing process, a spaceship decelerates at a constant rate of 5.3 m/s2 heading towards the Earth. A 3kg lamp is hanging straight down, attached to the ceiling of the ship cabin by a chain. What is the tension in the chain?
Sunday, November 4, 2012 at 1:49pm

College Physics
In 1986, the distance of closest approach of Halley’s comet to the Sun is 0.57AU. (1 AU is the mean Earth-Sun distance = 150 million kilometers.) The comet’s speed at closest approach is 54.97 km/s. (a) – By 1989, Halley’s comet had traveled to a distance ...
Sunday, November 4, 2012 at 12:27pm

Pre- AP Physics
The earth exerts a force of 1400 N on an orbiting communications satellite that is 35 mi above the Earth. What is the magnitude of the force the satellite will exert on the earth? Answer in units of Newtons
Sunday, November 4, 2012 at 10:07am

science
How long would it take a radio wave with a frequency of 5.1 × 105 Hz to travel from Mars to Earth if the distance between the two planets is approximately 8.00 × 107 km?
Sunday, November 4, 2012 at 9:29am

Physics
Ac = v^2/R = g in orbit m g down toward earth exactly equals m Ac No other force from the floor or scale or hook on the ceiling is required to keep the radius.
Saturday, November 3, 2012 at 9:32pm

Physics
weightlessness experienced while orbiting the earth is due to ?
Saturday, November 3, 2012 at 9:08pm

physics
I do not see any interacting objects except the earth (providing gravitational force) and the body. The mass is also irrelevant since it will cancel. F = m a = - m g so a = -g Vi = +9 m/s g = -9.81 m/s^2 V at top = 0 V = Vi - 9.81 t so t = 9/9.81 = .917 seconds rising Max h = ...
Saturday, November 3, 2012 at 8:06pm

Physics
Ferry velocity with respect to earth = Ferry velocity with respect to water + water velocity with respect to earth magnitude = sqrt[2.5^2 + 2.0^2] = 3.20 m/s direction = arctan(2.5/2) = 51.3 degrees north of east.
Saturday, November 3, 2012 at 2:35am

Physics
A ferry is crossing a river.The ferry is headed due north with a speed of 2.5 m/s relative to the water and the river's velocity is 2.0 m/s to the east. What is the magnitude and direction of the ferry's velocity relative to Earth. ( Give the angle from east 0 degrees )
Saturday, November 3, 2012 at 2:10am

physics please help
Pease restate the Earth's magnetic field. Why is there a ? where there should be a ^ ? Shouldn't there be a minus sign? The magnetic flux before the coil is rotated is B*A*N where N is the number of turns. A = 10^-3 m^2
Friday, November 2, 2012 at 9:55pm

physics please help
In a physics laboratory experiment, a coil with 170 turns enclosing an area of 10cm^2 is rotated from a position where its plane is perpendicular to the earth's magnetic field to one where its plane is parallel to the field. The rotation takes 5.0×10^2 s . The earth...
Friday, November 2, 2012 at 8:17pm

Chemisty
I keep getting the answer to the volume of the atmosphere wrong. Are my calculations correct? Or what is my problem? I calculate that the total volume of Earth + thickness of atmosphere is: (4/3)*pi*(6450000 m)^3 = 1.124*10^21 I then calculate that the volume of the Earth is...
Friday, November 2, 2012 at 8:10pm

mechanics
The figure below shows a ball with mass m = 0.299 kg attached to the end of a thin rod with length L = 0.388 m and negligible mass. The other end of the rod is pivoted so that the ball can move in a vertical circle. The rod is held horizontally as shown and then given enough ...
Friday, November 2, 2012 at 5:18am

Chemisty
Perhaps I can get you started. Wouldn't the volume of the atmosphere+earth = (4/3)*pi*r^3. r would be radius of earth + thickness of atmosphere for total volume. Then determine volume of earth and subtract to obtain volume of the atmosphere.
Friday, November 2, 2012 at 12:21am

Chemisty
Enrico Fermi was a famous physicist who liked to pose what are now known as Fermi problems in which several assumptions are made in order to make a seemingly impossible estimate. One example of a Fermi problem is "Caesar's last breath" which estimates that you, ...
Thursday, November 1, 2012 at 9:05pm

science
although each place on earth has its own climate,they can be grouped based on certain overall characteristics.what are the keys factors that scientist use to determine the climate of a particular place
Thursday, November 1, 2012 at 5:31pm

Physics
Given that the Sun has a mass 333,000 times larger than Earth’s mass and Earth has an average distance of 1.49 x 1011 m from the Sun, at what distance from the Sun is the center of mass of the Earth-Sun system? a. 1.00 m b. 4.47 x 105 m c. zero d. 333,000 m e. 1.49 x ...
Wednesday, October 31, 2012 at 9:06pm

physics
Earth’s radius is R = 6.378•10⁶ m. L=Iω=mR²•2•π/24​•3600=84•(6.378•10⁶​)²•2• π/24•3600=….
Wednesday, October 31, 2012 at 6:19pm

physics
for an 84 kg person standing at the equator what is the magnitude of angular momentum about the earths center due to earth's rotation
Wednesday, October 31, 2012 at 5:06pm

physics
look up the relative gravities. Moon's gravity is about 1/6 of earth's. So, earth's gravity will be about 6 times the moon's. Naturally, the kg mass doesn't change, regardless of location.
Wednesday, October 31, 2012 at 12:44pm

physics
If Joe weighs 100N on the moon how much will Joe weigh on earth? N & kg
Wednesday, October 31, 2012 at 12:42pm

english
Animals Possess sensory powers that humans lack. Homing pigeons fly with great speed and accuracy when 1)___(e)d with messages to faraway places. How do Pigeons 2)___ themselves in unfamiliar regions? This remains something of a(n) 3)___. The mystery, however, is partly ...
Tuesday, October 30, 2012 at 9:51pm

Earth Science
a because i have my ged
Tuesday, October 30, 2012 at 4:12pm

History/English
This assignment is in my English class but its about MLK so I thought I'd put History and English. So this is REALLY long! I typed it all myself and all I need is someone to check my facts and to edit. I know it's long, so if you only want to read a paragraph that'...
Monday, October 29, 2012 at 10:43pm

Physics
1. If a bar magnet is broken into two pieces, how many magnetic poles are there? 2. A long straight wire carries a current in the direction shown in the following figure. At the point labeled A, is the direction of the magnetic field left, right, up. Down, into the page, or ...
Monday, October 29, 2012 at 7:03pm

science
the distance from the earth to the moon is 240000 miles. if the speed of light is 2.998 x 10^8 meters per second, how long does it take for light reflected from the moon to reach our planet?
Monday, October 29, 2012 at 4:54pm

Physics help
A car travels in a circle whose radius is 31 m, with a speed of 19 m/s. (1) What is the magnitude of the car's acceleration? _____ m/s2 (2) What is the nature (origin) of the horizontal force on the car? (What is exerting the force?) The force causing the car to turn is: ...
Sunday, October 28, 2012 at 10:57pm

Physics
The acceleration due to gravity calculated this way works well for objects near the Earth’s surface. How would you have to change the above equation if the object was 100,000 meters above the ground?
Sunday, October 28, 2012 at 1:12pm

Science
Fill in the blanks: 1. Minerals are classified in many ways, including hardness, streak, and _______ properties. 2. There are some minerals that are valued as _______ because of their hardness, color, and beauty. 3. Non-silicates make up less than 10% of Earth's _______; ...
Saturday, October 27, 2012 at 5:35pm

chem
DrBob is correct, something is wrong with the data. I suspect it is the value of pN2 should have been typed 569, which is quite close to what is found in Earth's atmosphere.
Saturday, October 27, 2012 at 3:56pm

Physics
(a) Find the direction and magnitude of the net force acting on the skier. Magnitude N Direction perpendicular from the slope (into the ground) perpendicular from the slope (away from ground) downhill, parallel to slope away from the center of the earth towards the center of ...
Friday, October 26, 2012 at 1:36pm

Physics
What would the weight of an object that is 4N on the earth be on the moon (acceleration due to gravity on the moon is 1.62m/s2?
Thursday, October 25, 2012 at 9:23pm

Physics
If the moon were twice as massive, would the attractive force of Earth on the moon be twice as large? Yes No What about the attractive force of the moon on Earth? Yes No
Thursday, October 25, 2012 at 5:13pm

Physics
In what way does gravity change with distance from Earth?
Thursday, October 25, 2012 at 5:12pm

Physics
Calculate the force of gravity between a newborn baby of mass 4 kg and the obstetrician of mass 75 kg, who is 0.5 m from the baby. N Which exerts more gravitational force on the baby, Mars or the obstetrician, given that Mars has a mass of 6.4 1023 kg and is 8. 1010 m from ...
Thursday, October 25, 2012 at 5:12pm

Physics
A pendulum consists of a 2.6 kg stone swinging on a 4.5 m string of negligible mass. The stone has a speed of 7.9 m/s when it passes its lowest point. (a) What is the speed when the string is at 53 ¢ª to the vertical? (b) What is the greatest angle with the vertical ...
Thursday, October 25, 2012 at 3:15pm

Physics
You accidentally got the right answer. Correect solution is following: The Earth makes one revolution (2π) during 1 year => the angular displacement for 5 days is θ= 2π•5/365 = 0.086 rad. The angular velocity of the Earth is ω= θ/t = 0.086/5&#...
Thursday, October 25, 2012 at 1:02pm

Math
Let d(t) be the shortest distance between Earth and the nearest other planet as a function of time t (where t is in years and t = 0 is noon on January 1, 1000 A.D., say). Is d continuous? Why or why not?
Wednesday, October 24, 2012 at 11:27pm

Science
Fill in the blanks 1. Minerals are classified in many ways, including hardness, streak, and ______ properties. 2. There are some minerals that are valued as _______ because of their hardness, color, and beauty. 3. Non-silicates make up less than 10% of Earth's _______; the...
Wednesday, October 24, 2012 at 10:41pm

scientist
how could measuring the orbit of a comet help scientists understand when it will next be visible on Earth?
Wednesday, October 24, 2012 at 7:11pm

Earth Science
It's 6200/90, since the largest internal angle of latitude is 90 degrees.
Wednesday, October 24, 2012 at 7:07pm

physics
Consider a spacecraft that is to be launched from the Earth to the Moon. Calculate the minimum velocity needed for the spacecraft to just make it to the Moon’s surface. Ignore air drag from the Earth’s atmosphere. Hint: The spacecraft will not have zero velocity when...
Wednesday, October 24, 2012 at 1:34am

physics
Consider a spacecraft that is to be launched from the Earth to the Moon. Calculate the minimum velocity needed for the spacecraft to just make it to the Moon’s surface. Ignore air drag from the Earth’s atmosphere. Hint: The spacecraft will not have zero velocity when...
Wednesday, October 24, 2012 at 1:17am

Math
ilorin is at 8.5 degree to the north,4.6 degree to the east and free town at 8.5degree to the north,13.3degree to the west calculate(a)their distance apart,measured along the parallel of latitude(b)their distance from the equqtor(c)their speed in km/h due to the rotation of ...
Wednesday, October 24, 2012 at 1:12am

Math
the speed of a point A due to the rotation of the earth is twice that point of B.if A is on latitud 22 degree to the north calculate the latitude of B
Wednesday, October 24, 2012 at 12:59am

Physics
How do I find the instantaneous acceleration of the earth orbiting the sun? Everything I am trying is incorrect. I am using 1 second as my time and get 1.99E-7 rads/second. First I tried: acceleration = theta x t / radius Where: theta = 1.99E-7 rads radius = 6.371E6 Then I ...
Tuesday, October 23, 2012 at 11:35pm

physics
You are explaining to a friend why the crew of the International Space Station feels weightless while orbiting the Earth. Your friend responds that he thought gravity was just a lot weaker up there. Show that it isn’t so by calculating the acceleration due to gravity 350 ...
Tuesday, October 23, 2012 at 10:45pm

Physics
An Earth satellite moves in a circular orbit at a speed of 5800 m/s. a)What is the radius of the satellite's orbit? b) What is the period of the satellites orbit in hours?
Tuesday, October 23, 2012 at 6:15pm

Physics
Astronomers can calculate the mass of a planet by using the orbital parameters of one of its moons. Consider a hypothetical planet, which has a hypothetical moon that orbits the planet in a roughly circular orbit with a radius of 3.95*10^8 m. The moon takes 12 Earth days to ...
Tuesday, October 23, 2012 at 6:14pm

Physics
The asteroid belt circles the sun between the orbits of Mars and Jupiter. One asteroid has a period of 10 Earth years. a) What is the asteroid's orbital radius? b)What is the asteroid's orbital speed?
Tuesday, October 23, 2012 at 6:12pm

Math
Earth has a new surface of 1.97x10^8 square miles. A new planet has a surface area 13 times the surface area of Earth. What is the surface area of the new planet? Do I multiply 1.97x13 or do I multiply 13x10^8? that's what i'm confused about.
Tuesday, October 23, 2012 at 5:56pm

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