Wednesday
October 1, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

Post a New Question | Current Questions

Science
What percent of water is not easily accessible or usable on earth? *A. .6% B. 12.5% C. 50% D. 99% Subtract the answer from the last question from 100%. What does the remainder represent and what are the sources of this percentage of water? A. 97% rivers only B. 1% lakes, ...
Wednesday, October 30, 2013 at 12:19pm

science
which type of eclipse would you expect to see if the moon passes directly between earth and the sun? a) a solar eclipse b) a lunar eclipse c) a total lunar eclipse d) a penumbra
Wednesday, October 30, 2013 at 12:18pm

science
How does gravity affect the moon? a) it pulls the moon toward earth b) it pushes the moon away from earth c) t allows the moon to move in a straight line d) it keeps the moon from colliding with the sun
Wednesday, October 30, 2013 at 10:08am

science
why does the sun appear to move westward across the sky during the day? a) because earth rotates to the east b) because earth rotates to the west c) because the sun moves in a westerly direction d) because of the way you are looking into the sky
Wednesday, October 30, 2013 at 8:26am

science
which of the following statements best describes the biosphere? a) it is a mixture of gases that contain dust particles b)it contains earths metal core c) it contains all of earths water d) it it the part of earth that contains living organisms is it d ?
Wednesday, October 30, 2013 at 8:24am

science
which of the following statements best describes the biosphere? a) it is a mixture of gases that contain dust particles b)it contains earths metal core c) it contains all of earths water d) it it the part of earth that contains living organisms is it d ?
Wednesday, October 30, 2013 at 8:09am

physics
Imagine a frictionless perfectly straight tunnel which runs from Boston (USA) to Delhi (India). We release (at zero speed) an object in the tunnel in Boston. Assume that the Earth is a perfect sphere with radius 6.4*10^3 km, with a mass of 6.0*10^24 kg and that the mass ...
Wednesday, October 30, 2013 at 5:54am

Physics
If the mass of a planet is 0.571 times that of the Earth and its radius is 0.787 times that of the Earth, estimate the gravitational field g at the surface of the planet. The gravitational acceleration on Earth is 9.8 m/s2. Answer in units of m/s2
Tuesday, October 29, 2013 at 10:34pm

science
which of the following would happen to the moon if gravity no longer affected it ? a) the moon would continue to move on it's orbital path b) the moon stop moving all together c) the moon would move in a spiral toward earth d) the moon would move in a straight line
Tuesday, October 29, 2013 at 2:53pm

Physics
A satellite moves in a circular orbit around the Earth at a speed of 5.3 km/s. Determine the satellite’s altitude above the surface of the Earth. Assume the Earth is a homogeneous sphere of radius 6370 km and mass 5.98 × 1024 kg. The value of the universal ...
Tuesday, October 29, 2013 at 1:38pm

PHYSICS
The magnetic field of the Earth at a certain location is directed vertically downward and has a magnitude of 54.0 µT. A proton is moving horizontally towards the west in this field with a speed of 6.00 ✕ 106 m/s. (a) What is the direction and magnitude of the ...
Tuesday, October 29, 2013 at 1:28am

Earth Space
Why is oxygen an imporant variable gas?
Monday, October 28, 2013 at 5:59pm

Physics
On a cloudless day, the sunlight that reaches the surface of the earth has an intensity of about 1.2 103 W/m2. What is the electromagnetic energy contained in 6.4 m3 of space just above the earth's surface?
Monday, October 28, 2013 at 2:32pm

Earth and Environmental Science
The solar wind can be thought of as evidence for which theory of light?
Monday, October 28, 2013 at 2:21pm

PHYSICS (HELP)
An instrument-carrying projectile of mass m1 accidentally explodes at the top of its trajectory. The horizontal distance between launch point and the explosion is xm. The projectile breaks into two pieces which fly apart horizontally. The larger piece, m3, has three times the ...
Monday, October 28, 2013 at 11:59am

physics(elena)
An instrument-carrying projectile of mass m1 accidentally explodes at the top of its trajectory. The horizontal distance between launch point and the explosion is xm. The projectile breaks into two pieces which fly apart horizontally. The larger piece, m3, has three times the ...
Monday, October 28, 2013 at 11:37am

Physics Classical Mechanics
The mean distance from the center of the earth to the center of the moon is rem = 3.84 × 108 m. The mass of the earth is me = 5.98 × 1024 kg and the mass of the moon is mm = 7.34 × 1022 kg. The mean radius of the earth is re = 6.37 × 106 m. The mean ...
Monday, October 28, 2013 at 6:10am

Physics Classical Mechanics
An instrument-carrying projectile of mass m1 accidentally explodes at the top of its trajectory. The horizontal distance between launch point and the explosion is xm. The projectile breaks into two pieces which fly apart horizontally. The larger piece, m3, has three times the ...
Monday, October 28, 2013 at 6:10am

Earth Science (Geography)
In what way can the soils, geology and slopes affect river flow?
Monday, October 28, 2013 at 4:49am

physics (please help)
An instrument-carrying projectile of mass m1 accidentally explodes at the top of its trajectory. The horizontal distance between launch point and the explosion is xm. The projectile breaks into two pieces which fly apart horizontally. The larger piece, m3, has three times the ...
Sunday, October 27, 2013 at 3:51pm

physics
Imagine a frictionless perfectly straight tunnel which runs from Boston (USA) to Delhi (India). We release (at zero speed) an object in the tunnel in Boston. Assume that the Earth is a perfect sphere with radius 6.4*10^3 km, with a mass of 6.0*10^24 kg and that the mass ...
Sunday, October 27, 2013 at 1:45am

physics
An instrument-carrying projectile of mass m1 accidentally explodes at the top of its trajectory. The horizontal distance between launch point and the explosion is xm. The projectile breaks into two pieces which fly apart horizontally. The larger piece, m3, has three times the ...
Saturday, October 26, 2013 at 6:30pm

physics
the moon has a period of 27.3 days and a mean distance of 3.90x10^8 m from the center of the earth. find the period of a satellite in orbit 6.7x10^6 m from the center of earth. thank you!
Saturday, October 26, 2013 at 2:04pm

Science
How is earth like a system?
Saturday, October 26, 2013 at 11:51am

physics
An instrument-carrying projectile of mass m1 accidentally explodes at the top of its trajectory. The horizontal distance between launch point and the explosion is xm. The projectile breaks into two pieces which fly apart horizontally. The larger piece, m3, has three times the ...
Friday, October 25, 2013 at 8:49pm

physics (help)
An instrument-carrying projectile of mass m1 accidentally explodes at the top of its trajectory. The horizontal distance between launch point and the explosion is xm. The projectile breaks into two pieces which fly apart horizontally. The larger piece, m3, has three times the ...
Friday, October 25, 2013 at 8:48pm

physics
An instrument-carrying projectile of mass m1 accidentally explodes at the top of its trajectory. The horizontal distance between launch point and the explosion is xm. The projectile breaks into two pieces which fly apart horizontally. The larger piece, m3, has three times the ...
Friday, October 25, 2013 at 8:23pm

PHYSICS
An instrument-carrying projectile of mass m1 accidentally explodes at the top of its trajectory. The horizontal distance between launch point and the explosion is xm. The projectile breaks into two pieces which fly apart horizontally. The larger piece, m3, has three times the ...
Friday, October 25, 2013 at 7:52pm

Science
How is Earth like a system?
Friday, October 25, 2013 at 6:10pm

physics
An instrument-carrying projectile of mass m1 accidentally explodes at the top of its trajectory. The horizontal distance between launch point and the explosion is xm. The projectile breaks into two pieces which fly apart horizontally. The larger piece, m3, has three times the ...
Friday, October 25, 2013 at 11:31am

Physics
Problem 2- A boat has a velocity of 0.54 m/s southeast relative to the earth. The boat is on a river that is flowing 0.60 m/s east relative to the earth
Friday, October 25, 2013 at 2:50am

Science ms sue please help
True or false during dry weather the water level in a small pond drops because of runoff. I think it's true but I'm not sure And in the water cycle water returns to earth as condensation usually in the form of rain or snow. Is that true? And when water vapor leaves it ...
Thursday, October 24, 2013 at 6:29pm

earth science
A heterogeneous mixture is a
Thursday, October 24, 2013 at 3:16am

physics
A satellite with mass 6.00*10^3 is in the equatorial plane in a circular orbit. The planet's mass = 6.59 *10^25 and a day of length is 1.6 earth days. How far from the center (in m) of the planet is the satellite? What is the escape velocity (km?sec) from the orbit? please...
Wednesday, October 23, 2013 at 12:42pm

Physics
Two main strategies are employed to deflect an asteroid: destruction or slowing it down by at least 425 s so that the earth can move out of the impact zone. Assume perfect inelastic collision. (a) If we know the speed of the asteroid (va), mass (ma), and the distance the ...
Tuesday, October 22, 2013 at 9:37pm

algebra
the weight of a body above the surface of earth varies inversely with the square of the distance from the center of the earth. if maria weighs 125 pounds when she is on the surface of the earth(3960 miles from the center),determine maria weight if she is at the top of mount ...
Tuesday, October 22, 2013 at 8:35pm

algebra
the weight of a body above the surface of earth varies inversely with the square of the distance from the center of the earth. if maria weighs 125 pounds when she is on the surface of the earth(3960 miles from the center),determine maria weight if she is at the top of mount ...
Tuesday, October 22, 2013 at 8:35pm

math
the biology class has a lab every days. the earth science class has a lab every three days . which class day do they both have class ?
Tuesday, October 22, 2013 at 6:26pm

Physics
A ball whirls around in a vertical circle at the end of a string. The other end of the string is fixed at the center of the circle. Assume that the total energy of the ball-Earth system remains constant. (a) What is the tension in the string at the bottom? (Use the following ...
Monday, October 21, 2013 at 6:01pm

physics
On earth, two parts of a space probe weigh 19200 N and 4130 N. These parts are separated by a center-to-center distance of 6.38 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far...
Monday, October 21, 2013 at 5:27pm

Physics Classical Mechanics
A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and ...
Monday, October 21, 2013 at 10:09am

Physics Classical Mechanics
A planet has a single moon that is solely influenced by the gravitational interaction between the two bodies. We will assume that the moon is moving in a circular orbit around the planet and that the moon travels with a constant speed in that orbit. The mass of the planet is ...
Monday, October 21, 2013 at 10:06am

PHYSICS
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
Monday, October 21, 2013 at 9:55am

science
Describe the motions that causes one day on earth
Sunday, October 20, 2013 at 8:14pm

physics(elena)
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
Sunday, October 20, 2013 at 5:28pm

PHYSICS URGENT HELP
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
Sunday, October 20, 2013 at 4:43pm

physics
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
Sunday, October 20, 2013 at 12:22pm

physics
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
Sunday, October 20, 2013 at 12:10pm

Projectile motion
A cannon is fired from a cliff top 15m high and at 30 degrees. It takes 3 seconds for canon to reach the earth, what is the initial velocity of the cannon
Sunday, October 20, 2013 at 10:17am

physics(HELP IT'S URGENT)
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
Sunday, October 20, 2013 at 6:49am

Physics Homework
Consider problem U concerning the geosynchronous satellite of mass 50 kg. It orbits at a radius of 42,300 km with a speed of 3076 m/s. a) How much energy is needed to lift the satellite from the earth's surface (Re=6,370 km) up to that radius? b) How much kinetic energy ...
Sunday, October 20, 2013 at 1:44am

Physics Homework
Consider problem U concerning the geosynchronous satellite of mass 50 kg. It orbits at a radius of 42,300 km with a speed of 3076 m/s. a) How much energy is needed to lift the satellite from the earth's surface (Re=6,370 km) up to that radius? b) How much kinetic energy ...
Sunday, October 20, 2013 at 12:46am

physics
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
Saturday, October 19, 2013 at 8:24pm

physics
A satellite with mass 6.00*10^3 is in the equatorial plane in a circular orbit. The planet's mass = 6.59 *10^25 and a day of length is 1.6 earth days. How far from the center (in m) of the planet is the satellite? What is the escape velocity (km?sec) from the orbit?
Saturday, October 19, 2013 at 7:55pm

physics
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
Saturday, October 19, 2013 at 6:10pm

PHYSICS
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
Saturday, October 19, 2013 at 5:07pm

Water - Math Question
This question is related to water footprint calculation. I have no idea how to go about this, if anyone could point me in the right direction, I'd be forever grateful! Background info: The water footprint of the resident of a Blue Sea riparian country (92 million residents...
Saturday, October 19, 2013 at 3:10pm

physics help (elena)
A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and ...
Friday, October 18, 2013 at 2:24pm

PHYSICS(HELP!!)
A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and ...
Friday, October 18, 2013 at 6:22am

physics (PLS HELP)
A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and ...
Friday, October 18, 2013 at 5:56am

physics
A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and ...
Friday, October 18, 2013 at 4:38am

Physics pls anyone can help me? its urgent
When the sun is in the zenith and the sky is perfectly clear, the solar power we receive on the surface of the earth is roughly 1 kW per square meter (on a horizontal surface that is normal to the direction of the sun). Calculate the average solar power per square meter (in ...
Friday, October 18, 2013 at 1:25am

PHYSICS(HELP)
A satellite with a mass of ms = 7.00 × 103 kg is in a planet's equatorial plane in a circular "synchronous" orbit. This means that an observer at the equator will see the satellite being stationary overhead (see figure below). The planet has mass mp = 8.59...
Thursday, October 17, 2013 at 5:51pm

Science
What is the difference between the layers of the earth by physical properties and chemical composition
Thursday, October 17, 2013 at 5:22pm

physics
A satellite with a mass of ms = 7.00 × 103 kg is in a planet's equatorial plane in a circular "synchronous" orbit. This means that an observer at the equator will see the satellite being stationary overhead (see figure below). The planet has mass mp = 8.59...
Thursday, October 17, 2013 at 1:25pm

Physics pls anyone can help me? its urgent
When the sun is in the zenith and the sky is perfectly clear, the solar power we receive on the surface of the earth is roughly 1 kW per square meter (on a horizontal surface that is normal to the direction of the sun). Calculate the average solar power per square meter (in ...
Wednesday, October 16, 2013 at 7:16pm

Science
What can scientists learn from the rate at which radioactive elements decay? A. a rock's absolute age* B. the relative age of rock layers C. where one soil horizon ends and the next begins D. the difference between molds and casts. After six half-lives, what percentage of ...
Wednesday, October 16, 2013 at 3:03pm

Science
What can scientists learn from the rate at which radioactive elements decay? A. a rock's absolute age* B. the relative age of rock layers C. where one soil horizon ends and the next begins D. the difference between molds and casts. After six half-lives, what percentage of ...
Wednesday, October 16, 2013 at 1:58am

Physical Science
An astronaut in a spacesuit has a mass of 100 kilograms. What is the weight of this astronaut on the surface of the Moon where the strength of gravity is approximately 1/6 that of Earth?
Tuesday, October 15, 2013 at 7:58pm

Science- Earth and its History
What can scientists learn from the rate at which radioactive elements decay? A. a rock's absolute age* B. the relative age of rock layers C. where one soil horizon ends and the next begins D. the difference between molds and casts. After six half-lives, what percentage of ...
Tuesday, October 15, 2013 at 3:18pm

Science
What can scientists learn from the rate at which radioactive elements decay? A. a rock's absolute age* B. the relative age of rock layers C. where one soil horizon ends and the next begins D. the difference between molds and casts. After six half-lives, what percentage of ...
Tuesday, October 15, 2013 at 11:46am

Science
Which of the following gases was most likely present in Earth's earliest atmosphere? A. nitrogen B. hydrogen* C. argon D. oxygen Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic time ...
Tuesday, October 15, 2013 at 10:01am

Geography.
How does the tilt of the earth's axis explain changes in temperature from one season to another in the temperate zone?
Monday, October 14, 2013 at 7:19pm

earth, science
Which of the following statements describes the development of the geologic time scale? A) Scientists developed the geologic time scale using fossilized remains from Europe and Asia. B) Scientists developed the geologic time scale by studying rock layers and index fossils ...
Monday, October 14, 2013 at 6:03pm

College Physics
Although they don’t have mass, photons—traveling at the speed of light—have momentum. Space travel experts have thought of capitalizing on this fact by constructing solar sails—large sheets of material that would work by reflecting photons. Since the ...
Sunday, October 13, 2013 at 8:21pm

Physics
A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E) 2,000 m
Saturday, October 12, 2013 at 11:39pm

Physics
A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E) 2,000 m
Saturday, October 12, 2013 at 11:39pm

Physics
A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E) 2,000 m
Saturday, October 12, 2013 at 11:38pm

Physical Science
The Earth moves in a nearly perfect circle around the Sun. Assume the speed stays constant. Is the Earth accelerating or not?
Saturday, October 12, 2013 at 10:46pm

Science-Earth's History
The geologic time scale originally ordered Earth's rocks by: A. absolute age B. relative age C. composition D. decades and centuries B Where did scientists originally get their information to develop the geologic time scale? A. They collected and studied rock samples in ...
Friday, October 11, 2013 at 12:33pm

science
Calculate the weight of a person with a mass of 67 kg that is holding a 12 kg box on earth
Thursday, October 10, 2013 at 12:03pm

Environmental Science
On Earth in the extreme northern and southern latitudes, how does the relationship between GPP and NPP change during an entire year’s time?
Thursday, October 10, 2013 at 10:29am

earth science
what element was in the ocean and what color was the water
Tuesday, October 8, 2013 at 5:28pm

earth science
How is the decaying of radioactive uranium into lead used to date rock?
Tuesday, October 8, 2013 at 5:26pm

poetry (Pioneer by Dorothy Livesay)
I have to answer the questions according to this poem, I have answered them but just want someone to look over them to see if they are right. The last one I had trouble with and need help on that one too. The answer that I think it is I have put arrows on them. Help would be ...
Monday, October 7, 2013 at 11:54am

Physics
A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0° above the horizontal. How long is she in the air before returning to Earth? (g = 9.81 m/s2)
Sunday, October 6, 2013 at 6:04pm

Physics
A rocket of 500 kg accelerates away from earth with an engine thrust of 13,500 N. a) what is the weight of the rocket? 4900 N b) how fast did the rocket accelerate? (I know the answer is 17.2 m/s^2 but how did they get that?)
Saturday, October 5, 2013 at 2:47pm

physics
A ball is thrown 107 m upward and then falls back to earth. Neglecting air resistance, how long will it be in the air? The acceleration of gravity is 9.8 m/s2 . Answer in units of s
Saturday, October 5, 2013 at 2:27pm

Physics
Many people mistakenly believe that the astronauts who orbit the Earth are "above gravity." Calculate g for space shuttle territory, 290 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 (...
Saturday, October 5, 2013 at 1:19am

science
For many years pellagra was believed to be an infectious disease promoted by unsanitary conditions. it was common in sanatoriums and orphanages but only among the patients and not the staff. a study of the diets showed that suffers of pellagra rarely ate high quality proteins...
Thursday, October 3, 2013 at 12:09pm

physics
The acceleration due to the moon's gravity at its surface is less than what it is here on the surface of the earth. The computed value of 1.6 m/s2 is consistent with what the Apollo Program astronauts observed during their explorations there. Imagine an astronaut holding a...
Wednesday, October 2, 2013 at 10:12pm

Science
An advertisement claims that three out of five dentists prefer a particular type of toothpaste. After researching the study, you find that the toothpaste company paid for it. Why should you be skeptical of the advertisement's claims? a. because the dentists are showing ...
Wednesday, October 2, 2013 at 12:54pm

Science
How far does any object on Earth fall after being in free fall for 7.5 seconds? Remember g=9.81 m/s2
Tuesday, October 1, 2013 at 5:57pm

Astronomy
Now imagine you’re an astronomer on Earth looking at the spectrum of an object in space. In the spectrum you are looking for the so-called Lyman- alpha line of hydrogen which occurs at a wavelength of  = 122 nm. In your telescope, you observe the Lyman- ...
Tuesday, October 1, 2013 at 5:18pm

Physics
A small airplane has a speech of 200km/h with respect to the air. There is strong wind blowing at 77km/h at 23 north of east with respect to the Earth . A) in which direction should the plane head in order to land at an airport due north of its present location?B) what would ...
Tuesday, October 1, 2013 at 9:54am

Physics ...... Science
A small airplane has a speech of 200km/h with respect to the air. There is strong wind blowing at 77km/h at 23 north of east with respect to the Earth . A) in which direction should the plane head in order to land at an airport due north of its present location?B) what would ...
Monday, September 30, 2013 at 11:03pm

earth
Inclusion occurs when?
Monday, September 30, 2013 at 4:42pm

Physics
A bag of sugar weighs 6.70 lb on Earth. a) What would it weigh in newtons on the Moon, where the free-fall acceleration is one sixth that on Earth?
Monday, September 30, 2013 at 3:34pm

Science: physics
Why does the moon not require a push to keep it along its orbit around the earth? -I have to use Newton's first law of motion.
Monday, September 30, 2013 at 5:16am

Earth Science
A contour (topographic) map indicates that a stream is flowing across a landscape. If the stream has a constant volume, where on the map would the stream most likely have the highest velocity? a. As the stream moves across several closely spaced contour lines b. as the stream ...
Sunday, September 29, 2013 at 8:10pm

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