Tuesday
June 18, 2013

# Homework Help: Science: Earth

English
Thank you very much. Can you check the word choice in the following sentences, too? Thank you. 1) With the death of Elizabeth in 1603 the Tudor line died out and James VI (1603-1625) became the first Stuart King in England. 2) James I believed that the monarch was the ...
Sunday, September 18, 2011 at 2:04pm

geometry
whats the Biconditional of "the moon is the largest satellite of Earth"
Sunday, September 18, 2011 at 1:43pm

trig
A space shuttle 200 miles above the earth is orbiting the. Earth once every 6 hours. how far does the shuttle travel in one hour? Note the radius of earth about 4000 miles.
Saturday, September 17, 2011 at 9:19pm

Physics
The acceleration due to gravity on the moon is about one sixth its value on earth. If a baseball reaches a height of 62 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m
Saturday, September 17, 2011 at 9:05pm

physics
( If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 1.33 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2?
Saturday, September 17, 2011 at 6:38pm

Physics
On the earth, you throw an object up in the air at some velocity, v, and it reaches a maximum vertical displacement (max. height if you prefer) of 4.8 meters. If you went to the moon, where the value of the gravitational acceleration of the moon is 1/6 of that on earth, and ...
Friday, September 16, 2011 at 2:24pm

earth
a student measures the velocity of a water in a stream as 2.5 meters pe second.the actual velocity of the water is 3.0 meters per second. what is the approximate percent deviation of the studen's measurement
Thursday, September 15, 2011 at 10:16pm

physicssssss
A blue ball is thrown upward with an initial speed of 20.6 m/s, from a height of 0.8 meters above the ground. 2.5 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.2 m/s from a height of 23.7 meters above the ground. The force of ...
Thursday, September 15, 2011 at 9:23pm

physics
A blue ball is thrown upward with an initial speed of 20.6 m/s, from a height of 0.8 meters above the ground. 2.5 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.2 m/s from a height of 23.7 meters above the ground. The force of ...
Thursday, September 15, 2011 at 5:12pm

physics
A ball is thrown upward. After reaching a maximum height, it continues falling back to- ward Earth. On the way down, the ball is caught at the same height at which it was thrown upward.If the time (up and down) the ball remains in the air is 2.3 s, find its speed when it ...
Thursday, September 15, 2011 at 4:12pm

English check please I've corrected it again
. Dispatch 2. Orient 3. Enigma 4. Discern 5. Enhance 6. Attribute 7. Nocturnal 8. Exemplify 9. Mobile 10. Attest 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)...
Wednesday, September 14, 2011 at 1:12pm

English Correction
My answers: 1. Dispatch 2. Discern 3. Enigma 4. Orient 5. Enhance 6. Attribute 7. Nocturnal 8. Exemplify 9. Mobile 10. Attease 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 ...
Wednesday, September 14, 2011 at 12:03pm

earth and space
the grams on the moon is different then space ?
Wednesday, September 14, 2011 at 11:30am

math
earth diameter is 13000 kilometers, globe diameter of0.5 meter, what is the globes scale as a ratio. What distance on Earth would 1 cm on the globe represent?
Wednesday, September 14, 2011 at 9:29am

Earth/Space Science
Some scientists have hypothesized that meteorites have periodically bombarded Earth and caused mass extinctions every 26 million years. How might this hypothesis be tested?
Tuesday, September 13, 2011 at 9:41pm

Earth
Some scientists have hypothesized that meteorites have periodically bombarded Earth and caused mass extinctions every 26 million years. How might this hypothesis be tested?
Tuesday, September 13, 2011 at 9:01pm

Physics I
An Earth satellite moves in a circular orbit 770 km above the Earth's surface. The period of the motion is 100.0 min. What is the speed of the satellite? What is the magnitude of the centripetal acceleration of the satellite?
Tuesday, September 13, 2011 at 8:19pm

Word Problems
Will someone please write an expression for these? I am horrible at this, i will solve them though. 1.) Logan withdrew \$32 from her bank account. After her withdrawal, her balance was \$8. How much was originally in her account? 2.)The baseball birthday batter package at a ...
Tuesday, September 13, 2011 at 3:36pm

English
Could you please check these two sentences, please? 1) Water chute and spring board don't have the same meaning, but I think I can use them both with "dive into the water". 2) Superman was both a superhero endowed with superpowers and a shy and insecure ...
Tuesday, September 13, 2011 at 10:37am

Physics
A rocket is launched from rest. After 8.0 min, it is 160 Km above the Earth’s surface and is moving at a speed of 7.6 Km/s. Assuming the rocket moves up in a straight line, what are its (a) average velocity and (b) average acceleration?
Tuesday, September 13, 2011 at 7:25am

phy
A blue ball is thrown upward with an initial speed of 20.6 m/s, from a height of 0.8 meters above the ground. 2.5 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.2 m/s from a height of 23.7 meters above the ground. The force of ...
Tuesday, September 13, 2011 at 12:22am

geography
Into how many degrees of longitude is the Earth divided? My answer is 360 degrees. Am I correct?
Monday, September 12, 2011 at 10:22pm

Social Studies
How are these facts contribute to life on earth? *Gravity holds the sun together. *The sun is about 4.5 billion years old. *The sun is by far the largest object in the solar system.
Monday, September 12, 2011 at 8:47pm

physics
At a point high in the Earth’s atmosphere, He 2+ ions in a concentration of 2.8 X 1012/m3 are moving due north at a speed of 2.0 X 105 m/s. Also, a 7.0 X 1011/m3 concentration of O2 ions is moving due south at a speed of 7.2 X 106 m/s. Determine the magnitude and ...
Monday, September 12, 2011 at 7:27pm

Science
A satellite orbiting at an elevation of 3200 km does what a) Stays beyond the earth's gravity, which is why it stays up there. B) in an elliptical orbit, since its speed is less than the escape velocity. C) Falling toward earth with an acceleration equal to g. D) Falling ...
Sunday, September 11, 2011 at 9:42pm

Science
what would tides be like if the moon did not exist? a) There would be no tides without the moon's gravity. b) There would be one high tide and one low tide every 24 hours because of the sun's gravity, with the high tide at noon and the low tide at midnight. c) There ...
Sunday, September 11, 2011 at 9:19pm

Science
Why doesn't the space station fall toward the earth, instead of remaining in space? a) It is beyond the earth's gravitational pull. B) The earth's gravity is balanced out by the attraction of the sun and other planets. C) Centrifugal force keeps it up. D) It does ...
Sunday, September 11, 2011 at 8:32pm

Algebtra
from 630 feet at the top of the horizon. Due to the curvature of the earth how far away is the city. using d=sqrt[3h/2] where d is the distance in nautical miles and h is the height in feet.
Sunday, September 11, 2011 at 7:14pm

Earth/Space Science
Explain why scientific ideas that have been subject to many tests are still considered theories and not scientific laws.
Saturday, September 10, 2011 at 11:58pm

Science
Can someone please help me with these questions below thank you. 1. What do you think the impact of the earth's climate will be like if everyone enjoyed the same lifestyle? 2. What will it be like for The health of ecosystems and biodiversity? 3. What will the impact be ...
Saturday, September 10, 2011 at 9:10pm

Physics
A rocket starts from rest and moves upward from the surface of the earth. For the first 10s of its motion, the vertical acceleration of the rocket is given by a_y =( 2.70m/s^3)t, where the +y-direction is upward. 1) What is the height of the rocket above the surface of the ...
Saturday, September 10, 2011 at 8:26pm

physics
A canoe has velocity of 0.40m/s southwest relative to earth.the canoe is on a river that is flowing 0.50m/s east relative to earth find the velocity (magnitude and direction) of the canoe relative to the river.
Saturday, September 10, 2011 at 8:02pm

astronomy
what is the speed of a point on the equator in miles per hour as the earth rotates on its axis?
Saturday, September 10, 2011 at 7:57pm

earth
if the radius of the earth's orbit around the sun is 93,000,000 miles, what is the speed of the earth in it's orbit in miles per hour?
Saturday, September 10, 2011 at 7:39pm

astronomy
the radius of earth is 4000 miles, how far would you travel in going around the equator?
Saturday, September 10, 2011 at 7:09pm

Physics & Gravity
The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 51 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m would ...
Friday, September 9, 2011 at 8:06pm

Physics - Aristotle and his theory
Aristotle beleived that wood was a combination of fire, water, and earth. Use his 4 element theory to explain why a wooden boat floats on water. His theory is hard for me to understand. The only thing I know is that the boat floats on the water because the water is more dense ...
Friday, September 9, 2011 at 8:03pm

Physics
When out in space in International Space Station (ISS), Astronauts experience weightlessness. The ISS’s orbit is 354 km (that is 3.54 x 105 m) above the surface of the earth (You can get more educational NASA resources from: The distance separating the center of the earth...
Thursday, September 8, 2011 at 7:34pm

Physics
An austronaut orbits the Earth in the space shuttle, in one complete orbit, is the magnitude of thr displacement the same as the distance traveled?
Thursday, September 8, 2011 at 6:06pm

physics
the moon orbits the earth in a circle (near enough) of radious 3.8x10^8 m, taking 27.3 days to make a complete orbit. what is the speed of the moon relative to the earth?
Thursday, September 8, 2011 at 1:58pm

Physics
When out in space in International Space Station (ISS), Astronauts experience weightlessness. The ISS’s orbit is 354 km (that is 3.54 x 105 m) above the surface of the earth. The distance separating the center of the earth from the center of the ISS is then approximately ...
Thursday, September 8, 2011 at 8:57am

PHYSICS
A student of weight 830 N was sent to another planet called Nerdland. If Nerdland has a mass that is three times the mass of the earth and a radius that is half the radius of the earth, what would be the mass in kg of the student when on Nerdland?
Thursday, September 8, 2011 at 8:37am

uphysics
Some planetary scientists have suggested that the planet Mars has an electric field somewhat similar to that of the earth, producing a net electric flux of 3.57×1016 into the planet's surface.
Wednesday, September 7, 2011 at 11:28pm

physics
If the average speed of an orbiting space shuttle is 19600 mi/h, determine the time required for it to circle the Earth. Make sure you consider the fact that the shuttle is orbiting about 200 mi above the Earth's surface, and assume that the Earth's radius is 3963 miles
Wednesday, September 7, 2011 at 11:10pm

physics
could you estimate the mass of the entire earth? How? If we cannot direct measure the earth's mass, how was it determined?
Wednesday, September 7, 2011 at 5:14pm

earth
A man stands at the north pole, his mass is 100 kg. Later he goes and stands at the equator. Compute what force he exerts on the earth when he stands at the: a) north pole, b) equator. Which force is greater and find the difference.
Wednesday, September 7, 2011 at 8:24am

Physics
At the heighest point on earth, the distance to the center of the earth is approximately equal to 1.0014 times the radius of the earth. What would be in N/kg the magnitude of the gravitational field (g) due to the earth at that position? Assume 9.8 N/kg for g at the surface of...
Tuesday, September 6, 2011 at 11:58pm

phsics
A student of weight 830 N was sent to another planet called Nerdland. If Nerdland has a mass that is three times the mass of the earth and a radius that is half the radius of the earth, what would be the mass in kg of the student when on Nerdland?
Tuesday, September 6, 2011 at 11:43pm

Physics
Suppose a space capsule with an astronaut inside is launched from the top of a tower at some angle above the horizontal. a)While the capsule is in free fall, what are the acceleration of the astronaut and the capsule? b)If the astronaut measures his acceleration compared with ...
Tuesday, September 6, 2011 at 8:24pm

physics
Gravity on the moon is only 1/6 as strong as gravity on the Earth. What is the weight of a 16 kg object on the moon and on the Earth?
Tuesday, September 6, 2011 at 10:19am

physics
Gravity on the moon is only 1/6 as strong as gravity on the Earth. What is the weight of a 16 kg object on the moon and on the Earth?
Tuesday, September 6, 2011 at 10:10am

College Statistics
The brightness of sunlight at the earth's surface changes over time depending on whether the earth's atmosphere is more or less clear. Sunlight dimmed between 1960 and 1990. After 1990, air pollution dropped in industrial countries. Did sunlight brighten? Here are data...
Tuesday, September 6, 2011 at 1:07am

English (Critique my essay!)
This my reading response paper! Critiquing is most welcome! P.S Its an informal paper so we don't need an intro or conclusion we just go straight to the point. “The Creation Cycle” The Creation Cycle is partially conjoined with the Creation of the Universe and ...
Sunday, September 4, 2011 at 5:22am

physics
An Earth satellite moves in a circular orbit 824 km above Earth's surface with a period of 101.2 min. What are (a) the speed and (b) the magnitude of the centripetal acceleration of the satellite?
Friday, September 2, 2011 at 8:48pm

physics
A student of weight 600 N was sent to another planet called Nerdland. If Nerdland has a mass that is three times the mass of the earth and a radius that is half the radius of the earth, what would be the mass in kg of the student when on Nerdland?
Friday, September 2, 2011 at 11:43am

math
Find the distance that the earth travels in seven days in its path around the sun. Assume that a year has 365 days and that the path of the earth around the sun is a circle of radius 93 million miles. [The path of the earth around the sun is actually an ellipse with the sun at...
Friday, September 2, 2011 at 1:11am

Ag Bio 1
In general, greater biodiversity exists closer to Earth's equator than in areas closer to Earth's poles. What does this mean in terms of the number of species that are found in these regions? Please help, they might as well have been speaking Japanese D:
Thursday, September 1, 2011 at 10:16pm

physics
Earth has a mass of 5.98 × 1024 kg. The average mass of the atoms that make up Earth is 40 u. How many atoms are there in Earth?
Thursday, September 1, 2011 at 8:59pm

Science
How many times did earth orbit the sun between140ce and 1543, please show work
Thursday, September 1, 2011 at 7:36pm

math
Scientists have calculated that the Moon's revolution around Earth is increasing by about .015 s per century. At this rate, how long would it take the length of a month to increase by one full day?
Thursday, September 1, 2011 at 6:52pm

How much time will it take for Earth to reach the opposite side of the Sun?
Wednesday, August 31, 2011 at 4:49pm

Chemistry
The mass of the earth is known to be about 5.98 X10^24kg assume that it is approx. spherical with an average diameter of 1.276X10^7 METERS. from these data calculate the average density of the earth(g/cm^3) could the earth be made mostly of water (density=1.00g/cm^3), abundant...
Tuesday, August 30, 2011 at 3:35pm

physics
A student of weight 990 N was sent to another planet called Nerdland. If Nerdland has a mass that is three times the mass of the earth and a radius that is half the radius of the earth, what would be the mass in kg of the student when on Nerdland?
Tuesday, August 30, 2011 at 1:43pm

physics
the moon is 4*8 m away from the earth Aradar signal transmitted from the earth .How much will it take to reach the moon?
Tuesday, August 30, 2011 at 12:36am

Astronomy
If the giant blue star R136a1 has the diameter 35 times our sun, how many times bigger is it? example: our sun is 1.3 million times bigger than the earth. thanks for the help!
Sunday, August 28, 2011 at 12:08pm

Chemistry
Can somebody check my answers 1. If a small piece of sodium is dropped into water, it begins to react, forming hydrogen gas and sodium hydroxide. In the equation, 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g), the sodium hydroxide that is formed is a A. compound in solution. ...
Friday, August 26, 2011 at 8:55am

chemistry
#1)hydrochloric acid is a relatively strong acid . imagine that HCl is added to a buffer solution containing the weak acid phosphoric acid and a salt a)will HCl react with weak acid (H3PO4), or will it react with the salt (Na2HPO4)? b)one product of this reaction will be a new...
Tuesday, August 23, 2011 at 5:04pm

Math
The surface area of a sphere is given by the formula 4pi r2, where is it's radius. Although the shape of earth is noth exactly spherical, it has an average radius of 3960 miles. Estimate the surface area of earth.
Tuesday, August 23, 2011 at 5:50am

social studies
how many temperature or heat zones the earth has been divided?
Monday, August 22, 2011 at 2:05am

physics
1. 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? (Note: this question refers to Newton’s equation for the force ...
Sunday, August 21, 2011 at 6:07pm

chemistry
why doesnt sun attract earth towards it
Sunday, August 21, 2011 at 7:49am

english
can you please help me correct these sentances so it sounds better. During sunset the sun falls and an evening star progressively emerges. To the poet, this event may symbolize the rising of the dead from earth and entering of the soul to heaven. i want make this entence more ...
Sunday, August 21, 2011 at 1:09am

science
I HAVE WRITTEN A MITIGATION PLAN AND WANTED TO KNOW IF SOMEONE WOULD READ IT A GIVE ME FEED BACK AS TO WHAT I CAN CHANGE Energy Conservation Mitigation Plan Humans are not making energy conservation a priority. Spending a day without energy will be a hard task to do. Society ...
Saturday, August 20, 2011 at 6:32pm

english
I have a feeling that my sentences are very bad. can you please correct them. the three senetnces are based on the poem "crossing thebar" by alfred tennyson. 1) The reason why the ship comes out from the boundless deep is because the ship symbolically represents the ...
Saturday, August 20, 2011 at 12:21am

georaphy
Can you help? Is the Arctic Circle north or south of the Tropic of Capricorn? My Mom says it can be north or south of the Tropic of Capricorn because the earth is round. My answer is the Arctic Circle is north of the Tropic of Capricorn. WHO is RIGHT, Me or my Mom?
Friday, August 19, 2011 at 8:21pm

Math
A satellite moving in a circular orbit with respect to the earth's center experiences a gravitational force. If the satellite is put into a new circular orbit of smaller radius, how will the gravitational force and the speed of the satellite change ,if at all?
Friday, August 19, 2011 at 10:32am

physics
1. You slowly lift a book of mass 2 kg at a constant velocity a distance of 3 m. How much work did you do on the book? I got 180 for this 2. A 15 kg crate is moved along a horizontal floor with a rope that makes a 30 degree angle with the horizontal. If the tension in the rope...
Friday, August 19, 2011 at 12:35am

earth
Why is the Earth's atmosphere rich in oxygen and poor in carbon dioxide?
Thursday, August 18, 2011 at 3:49am

physics
ques 1.......a boy walks from his home to his school at an average speed of 10 km per hour and returns to his home at an average speed of 15 km per hour . what is his average speed in km per hour during the entire round trip ? ques 2........a thief running at a speed of 8 km ...
Sunday, August 14, 2011 at 6:15pm

physics
ques 1.......a boy walks from his home to his school at an average speed of 10 km per hour and returns to his home at an average speed of 15 km per hour . what is his average speed in km per hour during the entire round trip ? ques 2........a thief running at a speed of 8 km ...
Sunday, August 14, 2011 at 6:15pm

physics
ques 1.......a boy walks from his home to his school at an average speed of 10 km per hour and returns to his home at an average speed of 15 km per hour . what is his average speed in km per hour during the entire round trip ? ques 2........a thief running at a speed of 8 km ...
Sunday, August 14, 2011 at 6:15pm

Algebra
1. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on earth also varies according to the elevation of the object? In particular, the weight of an object follows this equation: w=Cr -2 where C is a ...
Saturday, August 13, 2011 at 1:11am

physics
If the earth acceleration due to gravity on a mass of 2000kg on the earth surface is 10ms.What will be the acceleration due to gravity when it is at a point twice the radius of the earth.What is the gravitational force on it.
Friday, August 12, 2011 at 4:59am

scientific problem solving
a student wanted to know how his weight on mars would compare with his weight on earth. prentend that traveling to mars is possible.
Thursday, August 11, 2011 at 10:08pm

Physics
In the latest Indian Jones film, Indy is supposed to throw a grenade from his car, which is going 43.8 m/s, to his enemy's car, which is going 55.8 m/s. The enemy's car is 15.2 m in front of the Indy's when he lets go of the grenade. A) If Indy throws the grenade ...
Tuesday, August 9, 2011 at 2:22am

Precalc(attn Bobpursley)
Hi i posted this before but I wanted to ask Bobpursley a few questions on his reply 1)For the first function you used cosine when they ask for sin, why is that? Also why did you put .5 in the beginning and end of the function? 2)For the second question why did you put 10 in ...
Friday, August 5, 2011 at 9:36pm

Precalc
okay sorry last two questions! I promise! The sun always illuminates half of the moon’s surface, except during a lunar eclipse. The illuminated portion of the moon visible from Earth varies as it revolves around Earth resulting in the phases of the moon. The period from a...
Friday, August 5, 2011 at 6:21pm

geology
I need ideas for paper for using earth's resources responsibly
Friday, August 5, 2011 at 12:40pm

physics
A space probe of mass M is moving with uniform velocity v far from earth and from other massive bodies,and it is planned to deflect from its trajectory through an angle theta by firing from it a suitable mass at velocity v.Derive an expression for the suitable mass m
Tuesday, August 2, 2011 at 8:56am

physics
The acceleration due to gravity on the moon is 1.62 m/s2. What is the length of a pendulum whose period on the moon matches the period of a 4.50-m-long pendulum on earth
Sunday, July 31, 2011 at 11:06pm

physics
The acceleration due to gravity on the moon is 1.62 m/s2. What is the length of a pendulum whose period on the moon matches the period of a 4.50-m-long pendulum on earth
Sunday, July 31, 2011 at 11:06pm

Physics
Pretend our future colonists build a large round 2km diameter train track on the great plains of Mars that is sloped (angled) inward to artificially increase the gravity felt by the occupants living onboard the house sized train cars speeding along at the rails a constant ...
Sunday, July 31, 2011 at 10:15pm

Physics
In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth. Suppose that at its ...
Saturday, July 30, 2011 at 12:17pm

Earth Science
In what ways can sea level be lowered? What effect might this have on existing life forms? I can't find it in my textbook. Can somebody helps??????? THANKS A LOT!!!!!
Wednesday, July 27, 2011 at 11:18pm

physics
in what specific way does light from distant stars and galaxies tell astronomers that atoms throughout the universe have the same properties as those on earth?
Wednesday, July 27, 2011 at 1:11am

Physics
The radius of the Earth is 6.38 x(10^6)m. How far (path length) does a point on the equator move if the Earth rotates... a. 20 degrees b. 20 radians c. 20 revolutions
Tuesday, July 26, 2011 at 3:05pm

math
a spaceship leaves the alien mother-ship and begins descending to earth. it descends 64m during the first second and 7m less during each second afterward. if the aliens invade after 10s, how far did the ship descend?
Monday, July 25, 2011 at 7:05pm

physics
suppose you stand on a bathroom scale and get a reading of 700N. in principle, would the scale read more, less, or the same if the earth did not rotate?
Monday, July 25, 2011 at 10:31am

math
3. The height H of an object t seconds after it is propelled upward with an initial velocity v is represented by , where g is the gravitational pull and h is the initial height. The gravitational pull of the moon is 1.6 meters per second squared. The gravitational pull of ...
Sunday, July 24, 2011 at 9:59pm

Math
Suppose a scientist on Earth throws a baseball upward. The scientist lets go of the ball 2 meters above the ground with an initial velocity of 10 meters per second. How long does it take for the ball to hit the ground (H=0)? (Use the quadratic formula to solve this problem, ...
Sunday, July 24, 2011 at 2:49pm

physic
The star nearest to our solar system is said to be 3.8 ly away. How many km. away is this if a spaceship can travel at the speed 100 times that sound , how long armed it take that spaceship to travel from the earth to the nearest star. Express your answer in meaningful term.
Sunday, July 24, 2011 at 3:01am

alg
1. (20 points) Police use the equation to estimate the speed (s) of a car, in miles per hour, based on the length (x), of its skid marks upon sudden braking on dry asphalt. a. Solve this equation for d. b. A motorist is involved in an accident. The skid marks are measured to ...
Saturday, July 23, 2011 at 1:05am

Earth Science
How is the local hydrologic cycle affected by the practice of drawing drinking water from a river and then returning sewage to the same river? Can anyone please help?????? THANKS A LOT!!!!!
Wednesday, July 20, 2011 at 9:07pm

Chem
I have a chemistry test that I need help with. My answers have stars by them Can someone please help me with the answers to this test??? Part 1 – Matter as Energy & Structure 1. When a pair of electrons is shared between two atoms, a covalent bond is said to have formed...
Wednesday, July 20, 2011 at 1:52pm

physics
A satellites are placed in a circular orbit that is 2.44 × 107 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?
Tuesday, July 19, 2011 at 5:18pm

Phys Science
Good afternoon tutors..I need help on a few problems.Im really stuck.. 1) the space shuttle orbits at an altitude of approximately 200km above the surface of the earth. If the radius of the earth itself is 6380km, whats the acceleration de to gravity at the altitude of the ...
Tuesday, July 19, 2011 at 4:33pm

phys sci
the space shuttle orbits at an altitude of approximately 200 km above the surface of the earth. If the radius of the earth itself is 6380km, what is the acceleration due to gravity at the altitude ofthe space shuttle?
Tuesday, July 19, 2011 at 2:09pm

phys science
A space shuttle orbits at an altitude of approximately 200km above the surface of the Earth. If the radius of the Earth itself is 6380 km, what’s the acceleration due to gravity at the altitude of the space shuttle?
Monday, July 18, 2011 at 10:53pm

Physics
An antenna loosens and becomes detached from a satellite in circular orbit around the earth. Describe the antenna's subsequent motion. If it will land on earth, describe where: if not, describe hw it would be made to land on earth.
Sunday, July 17, 2011 at 6:24pm

Physics
An antenna loosens and becomes detached from a satellite in circular orbit around the earth. Describe the antenna's subsequent motion. If it will land on earth, describe where: if not, describe hw it would be made to land on earth.
Sunday, July 17, 2011 at 9:21am

Algebra
How do I calculate finding the weight of someone, on the earth's surface with a radius of 3900 miles, and their weight 625ft above the surface?
Saturday, July 16, 2011 at 12:28pm

physical science
If the earth had twice its present radius and twice its present mass, what would happen to your weight? Explain. What is the relationship between the radius (R) of orbit of a satellite and its period (T)?
Thursday, July 14, 2011 at 11:00pm

chemistry
Why do Alkali Metals & Alkaline Earth Metals have so much difference in their properties?
Wednesday, July 13, 2011 at 8:29am

physics
A child learns in school that the earth is traveling faster than 100,000 kilometers per hour around the sun, and in a frightened tone asks why we arent swept off. What statement about the motion of the Earth is, on average,true? A. We are traveling slower than the Earth B. We ...
Tuesday, July 12, 2011 at 12:33pm

science**
a large portion of the water that falls on the earth is absorded by plants and used in photosynthesis. the plants secure the soil with their spreading roots which of the following practices would contribute the most to periodic flooding in an area ? A building terraces on farm...
Monday, July 11, 2011 at 2:24pm

World History
1. Among early hunting and gathering peoples, the commonly occurring mark that looks like a "P" is thought to stand for a A. favored animal B. woman. C. powerful male leader. (my answer) D. symbol for a calendar. 2. Charles Darwin supported the theory that ...
Sunday, July 10, 2011 at 1:29pm

physics
a body thrown vertically upward returns to the earth in 3sec what was the initial velocity of the body? what height did the body reach? neglect the resistance of air. The answer after solving is 14.7m/s and 11m. please tell me how the answer is arrived.
Sunday, July 10, 2011 at 11:23am

physics
Using the inverse-square gravitational law, calculate the work required to lift a 1000-kg satellite from the earth's surface to an altitude of 100 mi and inject it into orbit at 17,500 mph. How long would a 300-hp engine have to be run to produce this much energy
Sunday, July 10, 2011 at 9:07am

physics
A helicopter is ascending vertically with a speed of 5.20 m/s. At a height of 120 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: v_0 for the package equals the speed of the helicopter.]
Friday, July 8, 2011 at 5:26pm

Statistics
The Hill of Tara in Ireland is a place of great archaeological importance. This region has been occupied by people for more than 4,000 years. Geomagnetic surveys detect subsurface anomalies in the earth's magnetic field. These surveys have led to many significant ...
Thursday, July 7, 2011 at 2:44pm

sci 207
The idea of tectonic plates shifting across the earth’s surface is central to explanations of geologic processes. Why is this idea still called the “theory” of plate tectonic movement
Wednesday, July 6, 2011 at 6:40pm

physics
given that the radius of the earth is 6.37×10^3km and the period of revolution of the moon round the earth is 27.3 days, calculate the average distance from the earth to the moon.
Tuesday, July 5, 2011 at 8:41pm

algebra 2
a research station in antartica is at approximately 75 degreess latitude. how many miles is the station from the equator, given that the radius of the earth is approximately 4000 miles? round your answer to the nearest mile.
Monday, July 4, 2011 at 12:22pm

physics
On planet x, an object weighs 10.4N. On planet B where the magnitude of the free fall acceleration is 1.48g (where g=9.8 m/s^2 is the gravitational acceleration on Earth),the object weighs 24.6N. The acceleration of gravity is 9.8 m/s^2. What is the mass of the object on Earth...
Saturday, July 2, 2011 at 10:30pm

chem
The average distance between planet X and Earth is about 1.5 x 10^8 miles. How long (minutes would it take pictures transmitted from a space vehicle on Planet X's surface to reach Earth?
Saturday, July 2, 2011 at 3:32pm

Physics
In a simulation on earth, an astronaut in his space suit climbs up a vertical ladder. On the moon, the same astronaut makes the same climb. In which case does the gravitational potential energy of the astronaut change by a greater amount?
Thursday, June 30, 2011 at 10:24pm

math
Earthquakes produce several types of shock waves. The most well-known are the P-waves (P for primary or pressure) and the S-waves (S for secondary or shear). In the earth's crust, the P-waves travel at around 6.5 km/s while the S-waves move at about 3.5 km/s. The actual ...
Thursday, June 30, 2011 at 4:57pm

physics
Earthquakes produce several types of shock waves. The most well-known are the P-waves (P for primary or pressure) and the S-waves (S for secondary or shear). In the earth's crust, the P-waves travel at around 6.5 km/s while the S-waves move at about 3.5 km/s. The actual ...
Thursday, June 30, 2011 at 4:56pm

Algebra 1
There is three times as much water as land on Earth's surface. What percent of earth is covered by water?
Sunday, June 26, 2011 at 7:55pm

Physics
two binary stars moving in a perfect circle orbit The stars have the same mass, the distance between them is one billion km (1x10^9 km), and the time each takes for one orbit is 10.4 Earth years. Determine the mass of each star (m1=m2). (this problem DOESN'T uses the ...
Saturday, June 25, 2011 at 11:11pm

Physical Science
the planet Jupiter is more than 300 as massive as earth. But a body would scarecly weighs 3 times as much on the surface of Jupiteras it would on the surface of the earth. Can you think of an explanation for why this is so?
Saturday, June 25, 2011 at 5:16pm

English
10.VerA(16-19) Identify the underlined word or phrase that should be corrected. 1.The cheerful(A),lively sound of(B) dance music expired(C) almost everyone(D).No error.(E) 2.After such(A)a magnificent(B) meal,we were(C) all quick to(D) applaud Mary for her delicious cooking? 3...
Friday, June 24, 2011 at 11:11am

physics
The planet mars has a mass of 6042e23 kg and a radius of 3038e6 m. how much would a 60 kg person weigh on Mars compared to their weight on Earth? How heavy he would feel he weighed in kg on Mars?
Thursday, June 23, 2011 at 6:13pm

earth
If the angular velocity is increased by 17 times of the earth what will be the weight of an object at the equator?
Tuesday, June 21, 2011 at 4:29am

chemistry
space probe Pioneer 11 was lanced April 5, 1973, and reached Jupiter in Dec.1974 traveling a distance of 998 km. How long did it take an electromagnetic signal to travel to earth from pioneer 11 when it was near jupiter?
Monday, June 20, 2011 at 6:13pm

physics
in the model ,how far away from the earth would the sun be?
Saturday, June 18, 2011 at 4:49pm

Physics
A parachutist with mass 79.7 kg jumps from an airplane traveling at a speed vi= 112 km/hr at a height H = 2570 m. He lands with a speed of vf = 5.21 m/s. What is the change in mechanical energy (J) of the earth- parachutist system from just after the jump to just before ...
Saturday, June 18, 2011 at 4:39pm

earth science
discuss stellar evolution(briefly describe each stage). what forces are opposing one another throughout the life of a star and how do they influence the various stages in the life cycle of a star?
Friday, June 17, 2011 at 5:39pm

earth science
how do we calculate or determine the distance to stars? what units do we use and what are the limitations (if any) of the method used for such calculations?
Friday, June 17, 2011 at 5:37pm

math
An iceberg breaks off from the Antarctic continent and floats due north at constant velocity/ It's latitude south decreases by 1 degree in 8 days. Taking the circumference of the earth to be 40 000km, calculate the speed of iceberg in ms^-1.
Friday, June 17, 2011 at 9:18am

physics
A mass is suspended on a spring scale. The scale shows a reading of 5N and stretches a distance of 0.2 meters from its relaxed length. 1)What is the spring constant of the scale? )If this scale was taken to a planet that has a mass 4 times larger than the earth and a radius 4 ...
Thursday, June 16, 2011 at 4:39am

Chemistry
I don't know why on earth I don't remember how to do this, but I can't, and it's so simple. Calculate [H+] and [OH-] of a solution with a pH of 9.7 Thank you.
Wednesday, June 15, 2011 at 2:06am

earth science
of the three "local wind"(land and sea breezes, mountain and valley breezes, and chinook and santa ana winds)which do you think could be most easily harnessed for the generation of electricity by a huge wind farm? some important things to consider:strength and ...
Tuesday, June 14, 2011 at 4:08pm

earth science
"perhaps more than any other single measurement, atmospheric pressure is the best indicator of current and changing weather conditions." explain and discuss thy this statement is correct. provide some examples (hint: discuss the difference in high and low pressure ...
Tuesday, June 14, 2011 at 4:02pm

PHYSICS
A 5.0-kilogram sphere, starting from rest, falls freely 22 meters in 3.0 seconds near the surface of a planet. Compared to the acceleration due to gravity near Earth’s surface, the acceleration due to gravity near the surface of the planet is approximately (1) the same (3...
Tuesday, June 14, 2011 at 1:15pm

Examine the evidence of the Earth's shape. The sharp horizon at first suggests a flat Earth with an edge. But as you walk toward the horizon, the "edge" recedes ahead of you, implying that the Earth's surface is curved. Look also at a ship sailing out to sea...
Tuesday, June 14, 2011 at 1:09pm

physics
a body is thrown vertically upward return to the earth in 3sec. (a)what was the initial velocity of the body (b)what height did the body reach? neglect the resistance of air.
Tuesday, June 14, 2011 at 11:53am

physics
a body is released from a height and falls freely towards the earth. exactly one sec later another body is released.what is the distance between the two bodies 2sec after the release of the second body. if g=9.8m/s^2.
Tuesday, June 14, 2011 at 11:50am

Science Earth
Would earthquakes of similar magnitudes in different regions of the Earth cause approximately the same levels of damage?
Monday, June 13, 2011 at 4:46pm

Science (Chemistry)
The Average density of Earth is 5.52g/cm^3. What is its density in a. kg/m^3 b. lb/ft^3. Please help me set up these equations. Thank you!
Monday, June 13, 2011 at 4:16pm

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