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July 29, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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physics
Calculate the force of gravity between Earth and the Sun (the Sun's mass = 2.0×10^30 kg; average Earth-Sun distance = 1.5×10^11 m).
Thursday, March 8, 2012 at 8:01pm

physics
Calculate the force of gravity between a newborn baby (mass = 2.6 kg) and the planet Mars (mass = 6.4 * 10^23 kg) when Mars is at its closest to Earth (distance = 5.6* 10^10m).
Thursday, March 8, 2012 at 6:50pm

3 grade english ms sue
vowels: r-controlled riddle read a clud and write the list word. when you have written all seven word, the answer will appear in the boxes. THIRD,EARLY, WORLD, CERTAIN, DIRTY, HERSELF, EARTH, WORD, PERFECT, VERB, NERVE, WORM, THIRSTY, WORKOUT, EARN what building has the most ...
Thursday, March 8, 2012 at 6:38pm

physics
A satellite is in circular orbit above the Earth at an altitude of 2000 km. What is the orbital speed of the satellite? what is the equation i need to use
Thursday, March 8, 2012 at 5:05pm

physics
Calculate the force of gravity between Earth (mass = 6.0 * 10^24 kg) and the Sun (mass = 2.0×10^30 kg). The average Earth-Sun distance is 1.5×10^11 m..
Thursday, March 8, 2012 at 1:30pm

Physics
The acceleration of gravity at the surface of the moon is approximately 1/6 that at the surface of the Earth (9.8m/s). What is the weight of an astronaut standing on the moon whose weight on Earth is 180lbs?
Thursday, March 8, 2012 at 12:29am

physics
A pendulum has a period of 0.70 s on Earth. What is its period on a planet where the acceleration of gravity is about 0.51 that on Earth?
Wednesday, March 7, 2012 at 10:59pm

physics
A pulsar is a rapidly rotating neutron star that continuously emits a beam of radio waves in a searchlight manner. Each time the pulsar makes one revolution, the rotating beam sweeps across the earth, and the earth receives a pulse of radio waves. For one particular pulsar, ...
Wednesday, March 7, 2012 at 9:56pm

Earth Science
Which of the following statements best describes the recharge zone of an aquifer? Thank you! A) anyplace that the water table of the aquifer meets the surface B) the boundary between the aquifer and the permeable rock above it C) an area above an aquifer that has significant ...
Wednesday, March 7, 2012 at 7:42pm

science 8th grade
ok, i don't have answer to these questions! #8: The interaction of air, water, and _________ causes weather. #9: Violent storms generally form where? #10:clouds form as warm air rises, expands, cools, and becomes saturated, and then _______________ condense(s) into tiny ...
Wednesday, March 7, 2012 at 7:08pm

Physics
a frictionless roller coaster car of mass m = 719 kg tops the first hill with speed v0 = 15.2 m/s at height h = 48.9 m. How much work does the gravitational force do on the car from that point to (a) point A, (b) point B, and (c) point C? If the gravitational potential energy ...
Wednesday, March 7, 2012 at 9:40am

Science
How can scientists use the geologic time scale by sequencing the events of the earth in a time line?
Tuesday, March 6, 2012 at 6:47pm

physics
The value of g at Earth’s surface is about 9.8 m/s^2. If Earth were of uniform density (same mass/volume throughout), what would the value of g be inside Earth at half its radius?
Tuesday, March 6, 2012 at 6:13pm

Science-Space
Compare Earth and the moon in terms of size and surface gravity.Explain please. What is the relationship between the moon's surface gravity, lack of an atmosphere, and temperature range? Explain please!
Tuesday, March 6, 2012 at 5:42pm

Science
How can scientists use the geologic time scale by sequencing the events of the earth in a time line?
Tuesday, March 6, 2012 at 5:29pm

physics
Calculate the force of gravity on a 1 kg mass at Earth's surface. The mass of Earth is 6.0×10^24 kg , and its radius is 6.4×10^6 m.
Tuesday, March 6, 2012 at 5:04pm

physics
Rank the microtidal forces on your own body, from greatest to least, produced by the:A. JupiterB. PlutoC. Earth greatest to least.
Tuesday, March 6, 2012 at 4:57pm

physics
Which of these cannot occur? A) A satellite orbiting about the equator.B) A satellite orbiting about the Earth's poles.C) Actually all these can occur.D) A satellite orbiting about the Arctic Circle.
Tuesday, March 6, 2012 at 3:51pm

physics
Careful measurements of local variations in the acceleration due to gravity can reveal the locations of oil deposits. Assume that the Earth is a uniform sphere of radius 6370 km and density 5500 kg/m3, except that there is a spherical region of radius 1.7 km and density 944 kg...
Tuesday, March 6, 2012 at 1:08pm

astronomy
A body has four times the mass of the Earth but its radius is two times larger. What is the acceleration of gravity on the surface of this planet? If you were on this planet, should you be able to jump (on average) farther distances, shorter distances or the same distances as ...
Tuesday, March 6, 2012 at 10:22am

ALG/TRIG
Lost is an understatement..please help me understand this. Orbits and Distance Johannes Kepler (1571–1630)discovered a relationship between a planet’s distance D from the sun and the time T it takes to orbit the sun. This formula is , where T is in Earth years and ...
Tuesday, March 6, 2012 at 2:22am

Chemistry
I did a back titration with an unknown carbonate and using the average % carbonate (by mass) which I found to be 27.40% and appropriate calculation decided where the unknown is an alkali metal carbonate or an alkaline earth metal carbonate. I have no idea how to tell the ...
Monday, March 5, 2012 at 9:06pm

Physics
Take the radius of the earth at the equator to be 6380 km a. Find the speed the speed of an object at the equator due to the earth's rotation. ___m/s b. Convert this speed to miles/hour (show your conversion factor in your written backup). __miles/hour
Monday, March 5, 2012 at 5:43pm

Physics
Take the radius of the earth's orbit to be 1.5 x 1011 m. a. Using a year to be 365 days, find the speed of the earth as it moves around the sun. __m/s b. Convert this speed to miles/hour (show your conversion factor in your written backup). __miles/hour
Monday, March 5, 2012 at 4:53pm

physics
A rocket carrying a satellite is accelerating straight up from the earth's surface. At 1.25 s after liftoff, the rocket clears the top of its launch platform, 69 m above the ground. After an additional 4.80 s , it is 1.00 km above the ground. Calculate the magnitude of the...
Monday, March 5, 2012 at 3:50pm

Physics
Take the radius of the earth at the equator to be 6380 km a. Find the speed the speed of an object at the equator due to the earth's rotation. ___m/s b. Convert this speed to miles/hour (show your conversion factor in your written backup). __miles/hour
Monday, March 5, 2012 at 2:28pm

Physics
How far above the surface of Earth would you weigh 63.6 percent of your surface weight?
Monday, March 5, 2012 at 2:23pm

physics
On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. The free-fall acceleration on the moon is 1/6 of its value on earth. Suppose he hits the ball with a speed of 25 m/s at an angle of 28° above the ...
Monday, March 5, 2012 at 11:14am

geometry
The diameter of Earth is 12,742 kilometers; the diameter of the moon is 3476 kilometers. a. If you flew around Earth by following the equator at a height of 10 kilometers, how many trips around the Moon could you take in the same amount of time, at the same height from the ...
Sunday, March 4, 2012 at 11:37pm

physics
Mars Rover When the Mars rover was deployed on the surface of Mars in July 1997, radio signals took about 12 min to travel from Earth to the rover.How far was Mars from Earth at that time?
Sunday, March 4, 2012 at 9:14pm

volume,mass,weight
if you travelled to a planet that had twice the force of gravity of earth and you have taken a small mass that is 1kg what is the mass weight and volume of the 1kg object on the new planet compared to earth
Sunday, March 4, 2012 at 8:45pm

physics
If the radius of the Earth somehow bloated to twice its size, with no changes in mass, your weight at the Earth's new surface would be ___A) one-quarter.B) one eighth.C) the same.D) twice.E) half.
Sunday, March 4, 2012 at 6:17pm

physics
Which of these three produces a greater tidal effect on you right now—the moon, the Earth, or the sunA) The sun.B) The Earth.C) The moon.
Sunday, March 4, 2012 at 6:16pm

physics
Why is your weight not one-quarter as much when you climb to the top of a twice as tall tree? A) Because, quite simply, of Newton's law of action and reaction.B) Because parts of the tree itself gravitationally attract you.C) But it is, in accord with the inverse-square ...
Sunday, March 4, 2012 at 6:14pm

Biology
my sister still be sick so i still helping her post questions. i write paragraph from her textbook that go with question. Ultimately, Darwin recognized in nature a process that operates in a manner similar to the way artifical selection worked on farms and in fields. Darwin ...
Sunday, March 4, 2012 at 12:20pm

physics
Rank the average gravitational forces from greatest to least between:A. Sun and Mars.B. Sun and the Moon.C. Sun and Earth. i answer b,c,a and its wrong
Saturday, March 3, 2012 at 10:16pm

physics
Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do...
Saturday, March 3, 2012 at 9:31pm

Math
Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do ...
Saturday, March 3, 2012 at 8:31pm

physics
If the Earth had two identical moons in one circular orbit, and the moons were as far apart in that orbit as they could be, the center of gravity of the Earth-moons system would beA) at the center of the Earth.B) outside the Earth, but beyond the orbital path of the moons.C) ...
Saturday, March 3, 2012 at 3:59pm

physics - please help
Assume the earth is a uniform sphere and that its path around the sun is curcular. Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the US in one year is about 9.33 x 10^9 J b) Calculate the ...
Saturday, March 3, 2012 at 11:20am

Earth Science
Describe how the principle of superposition was used in determining the relative ages of the cross-sections?
Friday, March 2, 2012 at 4:47pm

principles of physics
If the Earth had two identical moons in one circular orbit, and the moons were as far apart in that orbit as they could be, the center of gravity of the Earth-moons system would beA) at the center of the Earth.B) outside the Earth, but beyond the orbital path of the moons.C) ...
Friday, March 2, 2012 at 11:27am

Science
If a man has a mass of 90 kg on earth, what is his mass on the moon?
Thursday, March 1, 2012 at 7:45pm

Algebra
Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets, but did you know that ...
Thursday, March 1, 2012 at 6:49pm

physics
Determine the velocity of a satellite orbiting Earth at a height of 3.2 x 10^3 meters.
Thursday, March 1, 2012 at 3:10pm

physics
Imagine a planet that orbited the sun at a distance three times that of Earth. What would the period of that planet be in Earth years?
Thursday, March 1, 2012 at 3:09pm

Physics Please help!
Calculate the position of the center of mass of the following pairs of objects. Use acoordinate system where the origin is at the center of the more massive object. Give youranswer not in meters but as a fraction of the radius as requested. Get data from insidethe front cover ...
Tuesday, February 28, 2012 at 11:08pm

Physics
Calculate the position of the center of mass of the following pairs of objects. Use acoordinate system where the origin is at the center of the more massive object. Give youranswer not in meters but as a fraction of the radius as requested. Get data from insidethe front cover ...
Tuesday, February 28, 2012 at 9:08pm

Physics HELP!!!
A certain satellite has a kinetic energy of 7.5 billion joules at perigee (closest to Earth) and 3.5 billion joules at apogee (farthest from Earth). As the satellite travels from apogee to perigee, how much work does the gravitational force do on it? Does its potential energy ...
Tuesday, February 28, 2012 at 7:54pm

Physics
If an astronaut in full gear has a weight of 1150 N on Earth, how much will the astronaut weigh on the Moon?
Tuesday, February 28, 2012 at 3:51pm

phscal sicence
If an astronaut in full gear has a weight of 1150 N on Earth, how much will the astronaut weigh on the Moon?
Tuesday, February 28, 2012 at 3:50pm

Physics
An electron is moving paralel to the Earth's surface at the equator in a direction 12 degrees south of east. Its velocity is 9.2 x 10^4 m/s and a magnetic force of 9.4 x 10^-18 N is exerted on the electron. If the magnetic field points south at this location, what is the ...
Monday, February 27, 2012 at 10:38pm

science
One factor determining the effect of gravity on objects is their.....? The farther away from Earth an object gets, Earth's gravity affects it ......? Friction that occurs between the surface of around object and another surface is ........? Objects with larger surfaces ...
Monday, February 27, 2012 at 8:39pm

PHYSICS
If your mass on earth is 70 kg what will be your mass on the moon considering that the gravitational field strength on the moon (g) is 1/6 of that on the earth. (g on earth = 10N/kg)
Monday, February 27, 2012 at 7:52pm

english fixed-3
here's what i did for number 4. The world is deserting because we are taking water for granted. If people continue to waste water, the earth’s structure will change and it will be the main cause of earthquake and potentially a tsunami. and for number 5. 5. People ...
Monday, February 27, 2012 at 7:23pm

english fixed -2
thanks for helping write teacher. i fix again my sentences and can you please look at it again. ty John Cervantes Beth Braun February 27, 2012 Blue Gold - World Water Wars 10 key things about the movie Blue Gold - World Water Wars 1. Water is the source of life. We all depend ...
Monday, February 27, 2012 at 6:51pm

science
The words in the bank are air resistance,time, zero, inertia, mass, direction, friction, rolling friction, and less. See if I did them right and if I didn't write anything on the blank, I need help with it. THANKS!!!!!!!!!!!!!!!! 10. Speed can be determined if you know ...
Monday, February 27, 2012 at 6:43pm

science
Numbers 1-9 are true and false questions.Check if my answers are right and if I didn't write anything on the blank, I need help with them. Thanks!!!! _____ 1. Velocity could be reported as 50 k/hr. True 2. How far an object travels in a certain period of time is its speed...
Monday, February 27, 2012 at 6:29pm

english
sorry for posting it again i just need some help with proof read original thread display.cgi?id=1330379031 1. Water is the source of life. We all depend on it. Water is important, and we cannot survive a week without it. 2. Water should be free; it is a basic need for living. ...
Monday, February 27, 2012 at 5:27pm

science
if Earth's axis were not tilted,could any area have both a hot summer and a cold winter?
Monday, February 27, 2012 at 4:55pm

english FIXED
original thread: cgi?id=1330376726 1. Water is the source of life. We all depend on it. Water is important, and we cannot survive a week without it. 2. Water should be free; it is a basic need for living. We should not consider buying bottled water. 3. Agricultures use ...
Monday, February 27, 2012 at 4:43pm

english
i need help in forming my ideas into good sentences. i taken all these ideas from a movie that we watch from the class 1. Water is the source of life, we all depend on it,Water is important, We cannot survive a week without water 2. Water should be free, it is a basic need for...
Monday, February 27, 2012 at 3:36pm

earth-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 = 1.07 1022 kg) hits the Earth while traveling at a speed of 1.30 103 m/s (assume the asteroid is a point mass compared to the radius of the Earth) in each of the ...
Sunday, February 26, 2012 at 7:35pm

Science
Suppose the moon were closer to Earth. How would the force of gravity between Earth and the moon be different?
Sunday, February 26, 2012 at 12:46pm

Science
How would earth move if the sun including its gravity suddenly disappeared? Explain your answer.
Sunday, February 26, 2012 at 12:45pm

earth
how long does it take for light from Jupiter to come to earth. for example tonight the planet Jupiter can be seen by the moon, 2/25/12 and we see the light from the planet and how old is that light. thanks. jerry in colorado USA
Sunday, February 26, 2012 at 12:05am

Physics
Because of the Earth's rotation, a plumb bob does not hang exactly along a line directed to the center of the Earth. How much does the plumb bob deviate from a radial line at 35.1° north latitude? Assume the Earth is spherical.
Saturday, February 25, 2012 at 10:30pm

physics!!!
To monitor the breathing of a hospital patient, a thin belt is girded around the patient's chest . The belt is a 215-turn coil. When the patient inhales, the area encircled by the coil increases by 41.0 cm2. The magnitude of Earth's magnetic field is 50.0 µT and ...
Saturday, February 25, 2012 at 11:33am

american history
I nee help revising my essay here it is This is what my general view on American History. Well let me tell you it’s a course that we all have to take in high school to graduate. In school we are confronted with American History, state History and general courses of the ...
Friday, February 24, 2012 at 7:37pm

English Lit-Writeteacher please check if possible
I really appreciate you helping me earlier today but I have another poem by Wordsworth-Tintern Abbey 1.According to these lines, compared to his youth, Wordsworth see himself now as: a.More responsible b.Less happy c.More aware of the world's problems d.More serious e.Less...
Thursday, February 23, 2012 at 5:25pm

ENGLISH ESSAY
Could you plz help me to check if these two essays have thesis and thesis development? ESSAY 1:There has been much discussion over the maximum population capacity of our world today. This paper analyzes how agroecology has been a major benefit to society on a global scale. ...
Wednesday, February 22, 2012 at 9:46pm

physics
A Chinook (King) salmon (Genus Oncorynchus) can jump out of water with a speed of 5.95 m/s. (See Problem 4.9, page 111 for an investigation of how the fish can leave the water at a higher speed that it can swim underwater.) If the salmon is in a stream with water speed equal ...
Wednesday, February 22, 2012 at 8:39pm

physics
A Chinook (King) salmon (Genus Oncorynchus) can jump out of water with a speed of 5.95 m/s. (See Problem 4.9, page 111 for an investigation of how the fish can leave the water at a higher speed that it can swim underwater.) If the salmon is in a stream with water speed equal ...
Wednesday, February 22, 2012 at 8:38pm

Physics
A satellite moves on a circular earth orbit that has a radius of 6.4 106 m. A model airplane is flying on a 23-m guideline in a horizontal circle. The guideline is parallel to the ground. Find the speed of the plane such that the plane and the satellite have the same ...
Wednesday, February 22, 2012 at 5:02pm

math
One estimate for the distance from earth to the andromeda galaxy is 2,400,000 light years. What is this distance expressed in scientigic notation?
Wednesday, February 22, 2012 at 12:51pm

physics
Joe has a weight of 850 N (about 193 lb) when he is standing on the surface of the Earth. What would his weight (the gravitational force due to the Earth) be if he tripled his distance from the center of the Earth by flying in a spacecraft?
Wednesday, February 22, 2012 at 1:45am

earth/atmosphere
my homework says a,b,and c represent gases what is a? a has 78.09 present by volume and i need to know what gas a stands for....i thought it was argon but argon is already a gas listed...HELP
Tuesday, February 21, 2012 at 7:26pm

physic
calculate the attractive force between earth and sun. Neglect the radii, D= 1.50X10
Monday, February 20, 2012 at 11:42pm

Math
A satellite in a circular orbit 879.4 mi above the earth makes one complete orbit every 83.42min. What is its linear velocity? Use 3963 mi for the length of the radius of the earth.
Monday, February 20, 2012 at 8:40pm

earth
A satellite 200 miles above the earth is orbiting the earth once every 6 hours. How long, in hours, does it take the satellite to travel 8,400 miles? (Assume the radius of the earth is 4,000 miles.) Give your answer both as an exact value and an approximation to three ...
Monday, February 20, 2012 at 4:49pm

algebra
Could someone look over this paper before I turn it in? Thanks Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of...
Monday, February 20, 2012 at 4:33pm

PHYSICS HEELLPPP!!
Many people mistakenly believe that the astronauts who orbit the Earth are "above gravity." Calculate g for space shuttle territory, 225 kilometers above the Earth's surface (dashed line in sketch). Earth's mass is 6 1024 kg, and its radius is 6.38 106 m (...
Monday, February 20, 2012 at 3:26pm

english
i need help in forming these into good sentences ty 1. Microorganisms call soil their home as well, a single ounce of soil can contain over 100 million microorganisms. 2 mycelium makes dirt and The mycelium is usually hidden in the soil, in wood, or another food source 3.Soil ...
Monday, February 20, 2012 at 3:12pm

phys3
A biologist is studying growth in space. He wants to simulate Earth's gravitational field, so he positions the plants on a rotating platform in the spaceship. The distance of each plant from the central axis of rotation is r = 0.11 m. What angular speed is required?
Monday, February 20, 2012 at 2:55pm

physics
A satellite moves on a circular earth orbit that has a radius of 6.68E+6 m. A model airplane is flying on a 16.3 m guideline in a horizontal circle. The guideline is nearly parallel to the ground. Find the speed of the plane such that the plane and the satellite have the same ...
Monday, February 20, 2012 at 11:50am

Math/117 University of Phoenix
Could someone look over this paper before I turn it in? Thanks Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of...
Monday, February 20, 2012 at 11:17am

Math
A car travels due east with a speed of 42.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 70.0° with the vertical. Find the velocity of the rain with respect to ...
Sunday, February 19, 2012 at 11:46pm

math/117
Could someone look over this paper before I turn it in? Thanks Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of...
Sunday, February 19, 2012 at 6:46pm

physics
How far from the center of the earth must a person be to experience acceleration due to gravity that is one half the acceleration at the surface?
Sunday, February 19, 2012 at 2:49pm

math
the international space station orbits 350 km above earth's surface. earth's radius is about 6370 km.use the pythagorean theorem to find the distance from the space station to earth's horizon.
Saturday, February 18, 2012 at 10:05pm

physics--please help
Only need help with part c--answer for part a is 2.94 radians and for b it is 777 days Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be ...
Saturday, February 18, 2012 at 6:47pm

earth
do any questions here actually get answered??????
Saturday, February 18, 2012 at 2:24pm

Physics
If you throw a 36 kilogram rock off a cliff , how fast does it accelerate to the ground? The earth excerts a force of 200 Newtons on the rock.
Saturday, February 18, 2012 at 1:14pm

physics
A satellite moves on a circular earth orbit that has a radius of 6.68E+6 m. A model airplane is flying on a 16.3 m guideline in a horizontal circle. The guideline is nearly parallel to the ground. Find the speed of the plane such that the plane and the satellite have the same ...
Saturday, February 18, 2012 at 9:29am

physics
Suppose a simple pendulum is used to measure the acceleration due to gravity at various points on the Earth. If g varies by 0.151 % over the various locations where it is sampled, what is the corresponding variation in the period of the pendulum? Assume that the length of the ...
Friday, February 17, 2012 at 7:04pm

physics
Only need help with part c Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are ...
Friday, February 17, 2012 at 3:02pm

physics
A satellite moves on a circular earth orbit that has a radius of 6.68E+6 m. A model airplane is flying on a 16.3 m guideline in a horizontal circle. The guideline is nearly parallel to the ground. Find the speed of the plane such that the plane and the satellite have the same ...
Friday, February 17, 2012 at 12:41pm

physics (Right Hand Rule Question)
A proton traveling due east in a region that contains only a magnetic field experiences a vertically upward force away from the surface of the earth. What is the direction of the magnetic field? a)North b)East c)South d)West e)Down I know I need to use the right hand rule to ...
Friday, February 17, 2012 at 12:39am

physics
A satellite orbits a planet at a distance of 3.80 108 m. Assume that this distance is between the centers of the planet and the satellite and that the mass of the planet is 3.90 1024 kg. Find the period for the moon's motion around the earth. Express the answers in days.
Thursday, February 16, 2012 at 10:03pm

Physics
The density of air near the earth's surface is 1.29 kg?m^3. If a helium balloon with a mass of 1 kg floats in air without rising or falling,what is the minimum volume of helium in the balloon? (presume that the mass of the material making up the balloon is negligible). I ...
Thursday, February 16, 2012 at 9:37pm

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