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Homework Help: Science: Earth

Recent Homework Questions About Earth

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PHYSICS
A projectile is fired from the surface of the Earth with a speed of 150 meters per second at an angle of 45 degrees above the horizontal. If the ground is level, what is the maximum height reached by the projectile?
Monday, October 1, 2012 at 6:03pm

AP PYHSICS
A projectile is fired from the surface of the Earth with a speed of 150 meters per second at an angle of 45 degrees above the horizontal. If the ground is level, what is the maximum height reached by the projectile?
Monday, October 1, 2012 at 6:02pm

Earth Science
How energy flows through the Earth's system?
Monday, October 1, 2012 at 11:56am

Physics
An airplane flies 340 km due east, makes a right-angle turn, and then flies 390 km due north. Find the magnitude of the plane’s displace- ment from its starting point. Neglect the curvature of the earth. Answer in units of km
Sunday, September 30, 2012 at 8:06pm

physics
According to Kepler's third law, the orbital period T of a planet is related to the radius R of its orbit by T2 R3. A planet's orbit is larger than Earth's by a factor if 3.39. What is the planet's orbital period?
Sunday, September 30, 2012 at 3:59pm

Earth Science
How energy flows through the Earth's system.
Sunday, September 30, 2012 at 1:11pm

earth science
How do astronomers use satellites?
Sunday, September 30, 2012 at 12:29pm

eath science
is moon a source of earth's energy?
Sunday, September 30, 2012 at 11:10am

physics
Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 . When a horizontal force of 340 is applied to a 68.0 box, the box slides on a level floor, opposed by a force of kinetic friction of 150 . Part A What is the magnitude of the ...
Saturday, September 29, 2012 at 8:32pm

physics
A 125 object is taken to a height of 210 above the Earth's surface. Part A What is the object's mass at this height? Part B What is the object's weight at this height?
Saturday, September 29, 2012 at 8:31pm

physics
Unless otherwise stated, all objects are located near the Earth's surface, where = 9.8 . A hockey puck with a weight of 0.80 is sliding freely across a section of very smooth (frictionless) horizontal ice. Part A When it is sliding freely, how does the upward force of the ...
Saturday, September 29, 2012 at 8:29pm

physics
Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 . A block of mass 23.0 slides down a frictionless surface inclined at 35. Part A To ensure that the block does not accelerate, what is the magnitude of the smallest force that you must ...
Saturday, September 29, 2012 at 8:26pm

physics
Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 . A 3000 truck tows a 1500 car by a chain. Part A If the net forward force on the truck by the ground is 3500 , what is the acceleration of the car? Part B What is the tension in the ...
Saturday, September 29, 2012 at 8:14pm

Earth Science
Two different areas of the United States receive the same amount of rainfall during a day. Area A has soil that contains many large pores and rocks made of sandstone. The soil in Area B is mainly heavy clay. Area A is a desert. Area B is a swamp. For each area (Area A and Area...
Saturday, September 29, 2012 at 12:43pm

Physics
A spy satellite is in circular orbit around Earth. It makes one revolution in 6.01 hours. (a) How high above Earth's surface is the satellite? [Answer in Km] (b) What is the satellite's acceleration? [Answer in m/s^2] I see this posted over and over again and I have ...
Saturday, September 29, 2012 at 2:00am

7th grade social studies
Explain the quote by Samuel de Champlain in your own words. "Through (exploration) we gain knowledge of different countries, regions and kingdoms; through it we attract and bring into our countries all kinds of riches; through it... Christianity (is spread)in all parts ...
Friday, September 28, 2012 at 6:03pm

Earth Science
Does energy flows through the Earth's system by heat?
Friday, September 28, 2012 at 11:55am

Earth Science
Can someone five me an example of how carbon cycles through the Earth's system?
Friday, September 28, 2012 at 11:46am

physics
Calculate the velocity needed for an object starting at the Earth's surface to just barely reach a satellite in a geosynchronous orbit. Ignore air drag and assume the object has a speed of zero when it reaches the satellite. (The orbital radius of a satellite in a ...
Thursday, September 27, 2012 at 1:19pm

Math/Trig
An airplane leaves an airport and flies due west 150 miles and then 170 miles in the direction 210°50'. Assuming the Earth is flat, how far is the plane from the airport at this time (to the nearest mile)
Thursday, September 27, 2012 at 10:15am

earth Geology
This is just a question that I was curious about, why do mountain belts run parallel to coastlines? Thanks
Wednesday, September 26, 2012 at 11:03pm

phy101
Calculate the velocity needed for an object starting at the Earth's surface to just barely reach a satellite in a geosynchronous orbit. Ignore air drag and assume the object has a speed of zero when it reaches the satellite. (The orbital radius of a satellite in a ...
Wednesday, September 26, 2012 at 8:38pm

7th grade Science help
1. _______ is energy that flows from an object with a higher temperature to an object with a lower temperature. (1 point) Heat Radiation Potential Chemical 2. The transfer of energy that occurs when molecules bump into one another is called _____. (1 point) radiation ...
Wednesday, September 26, 2012 at 7:51pm

science
1. Force exerted on an area is called _____. (1 point) pressure temperature gravity mass 2. The composition of the atmosphere is changing due to _____. (1 point) smog ozone depletion increase in CO2 (carbon dioxide) all of the above 3. The _____ is the layer of the atmosphere ...
Wednesday, September 26, 2012 at 7:15pm

Physics
If you suddenly multiplied the mass of Earth by a factor of 4, how would the period of a satellite change, if the radius of its orbit did not change? 4 times as long 1/4 as long 2 times as long 1/2 as long Unchanged
Wednesday, September 26, 2012 at 2:31am

Physics
A satellite sitting on the ground has a weight of 5000 N. When it is placed in orbit 500 km above the surface of the Earth (which has a radius of 6380 km), which choice best describes its weight? Very small but slightly greater than zero. Zero. Still 5000 N. Slightly less than...
Wednesday, September 26, 2012 at 2:28am

7th grade science
1) a classmate states that igneous rock must always become sedimentary rock next, according to the rock cycle. explain why this statement is incorrect. 2)why would granite have larger crystals than igneous rock s formed when lava cooled above the earth's surface?
Tuesday, September 25, 2012 at 11:00pm

Physics
A person can jump a horizontal distance of 3.10 m on Earth, where the free-fall acceleration, g = 9.81 m/s2. (a) How far could the person jump on the moon, where the free-fall acceleration is g/6 m (b) How far could the person jump on Mars where the acceleration due to gravity...
Tuesday, September 25, 2012 at 9:17pm

Physics
On some planet other than Earth a ball is thrown upward at a velocity of 22.3 m/s. It returns back to the exact position that it started at in 8.8s. What is this planets value for "g"? (
Tuesday, September 25, 2012 at 8:15pm

Maths
Calculate the density of earth given that its mass is 5.98x10^24 kg and volume is 8.78x10^8 m/s
Tuesday, September 25, 2012 at 5:37pm

Earth Science
determine the slope of an area, given the following: Start measuring at 700ft. measure a distance of 4 miles, and end at an elevation of 2432ft
Monday, September 24, 2012 at 8:05pm

writing
I have been trying to work on this assignment and I am not really understanding it and I try to get help from my teacher and she keeps sending me this and telling me when I do this she will help me with the rest but I don't understand this and I have told her this and she ...
Monday, September 24, 2012 at 6:45pm

college physics
A new planet has been discovered that has a mass one-tenth that of Earth and a radius that is one-sixth that of Earth. Determine the free fall acceleration on the surface of this planet. Express your answer in the appropriate mks units.
Monday, September 24, 2012 at 4:19pm

college physics
Although astronauts appear weightless, they are not. They only appear weightless because they are in free fall. If a 79 kg astronaut is orbiting Earth with an orbital radius of 5.31×107 m, determine how much the astronaut would weigh. Earth's mass is 5.974 1024 kg.
Monday, September 24, 2012 at 4:17pm

college physics
new planet is discovered orbiting a distant star. Observations have confirmed that the planet has a circular orbit with a radius of 21 AU and takes 118 days to orbit the star. Determine the mass of the star. State your answer with appropriate mks units. [NOTE: AU stands for &...
Monday, September 24, 2012 at 4:17pm

earth
how long would it take a radio wave with a frequency of 4.3 X10 to the 5th power Hz to travel from Mars to Earth if the distance between the two planets is approximately 8.00 x 10 to the 7th power km?
Sunday, September 23, 2012 at 7:44pm

physics
A ball is thrown straight downward from the surface of the moon. Is the maximum height it reaches less than, equal to, or greater than the maximum height reached by a ball thrown upwards on the earth with the same initial speed? Ignore air resistance in both cases
Sunday, September 23, 2012 at 6:49pm

physics
Your friend weighs 145 lb. What is her mass in kilograms if she went to the moon where the acceleration of gravity is 1/6 that on earth? i know that her weight in newtons is 652.5, and that her mass in kilograms is 65.25, and that her weight in newtons if she went to the moon ...
Sunday, September 23, 2012 at 3:28pm

Physics
A) Gravity pulls an area of wet soil and rock downward in a landslide B) An ... Many people know that the weight of an object varies on different planets, but did ... If the Earth's gravitational force causes a falling 74 kg student to accelerate .... the acceleration of ...
Sunday, September 23, 2012 at 1:00pm

Physics
At what DISTANCE from the earth's surface will a mass of 5.0kg be just 45.0N in weight
Sunday, September 23, 2012 at 8:55am

Physics
At what distance from the earth's surface with a mass of 5.0kg be just 45.0N in weight. HELP
Sunday, September 23, 2012 at 8:42am

physics
an airplane with a speed of 40.4 m/s is climbing upward at an angle of 54 degrees with respect to the horizontal. When the planes altitude is 520 m, the pilot releases a package. a. calculate the distance along the ground measured from a point directly beneath the point of ...
Sunday, September 23, 2012 at 2:49am

physics
A projected space station consists of a circular tube that will rotate about its center (like a tubular bicycle tire) as shown in the figure . The circle formed by the tube has a diameter of about 1.1 km. What must be the rotation speed (revolutions per day) if an effect equal...
Saturday, September 22, 2012 at 8:00pm

Physics
What is the period of Earth's (nearly) circular motion around the Sun? (2*pi*r)/T 1 year (1 year)/(2*pi) (2*pi)/(1 year) 2*pi*(1 year)
Saturday, September 22, 2012 at 7:15pm

Physics
The Earth has a mass of 5.97 x10^24 kg and the Moon has a mass of 7.36 x10^22kg. The average distance between the center of the Earth and the center of the moon is 3.84 x10^8m. (a) How far away would the Moon need to be for the magnitude of the gravitational force acting on it...
Friday, September 21, 2012 at 8:32pm

earth
what is geography?
Thursday, September 20, 2012 at 11:26pm

Physics
The average person passes out at an acceleration of 7g (that is, seven times the gravitational acceleration on Earth). Suppose a car is designed to accelerate at this rate. How much time would be required for the car to accelerate from rest to 59.1 miles per hour?
Thursday, September 20, 2012 at 9:40pm

Math
Can You help me with this question? The distance from the earth to the sun is about 1.5 X 10^8 km, while the distance from the earth to the moon is about 3.8 X 10^5 km. If a scale model of the solar system is constructed so that the distance from the Earth to the Sun is 100 ...
Thursday, September 20, 2012 at 12:32pm

earth science
astonomer think planets formed from interstellar dust and gased that clumped together in a process is called what?
Thursday, September 20, 2012 at 11:44am

physics
(a) If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 3.43 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
Thursday, September 20, 2012 at 12:02am

Clean Energy
What are some types of clean enregy and what are they? I have geothermal - heat from the Earth, hydropower - water power, wind power, biomass (I don't know what that is), and solar power - sun power. I would really like some help.
Wednesday, September 19, 2012 at 8:33pm

geometry
EARTH COMPLETES ONE FULL ROTATION EACH DAY MAKING THE SUN APPEAR TO RISE AND SET. IF THE SUN PASSES DIRECTLY OVER HEAD, BY HOW MANY DEGREES DOES ITS POSITION IN THE SKY CHANGE EVERY HOUR?
Wednesday, September 19, 2012 at 7:55pm

earth science
descibe the advanages of plotting data in graph form
Wednesday, September 19, 2012 at 2:45pm

earth
a space traveller determines the radius of a planet to be half of earth . After landing on its surface , he finds the acceleration due to gravity to be twice of that of surface of earth. Find the ratio of mass of planet to the earth
Wednesday, September 19, 2012 at 5:53am

Physics
On a distant planet, golf is just as popular as it is on earth. A golfer tees off and drives the ball 4.1 times as far as he would have on earth, given the same initial velocities on both planets. The ball is launched at a speed of 50 m/s at an angle of 32° above the ...
Tuesday, September 18, 2012 at 9:43pm

Physics
Consider a space pod somewhere between earth and the moon, at just the right distance so that the gravitational attractions to Earth and Moon are equal. Is this location nearer Earth or Moon?
Tuesday, September 18, 2012 at 1:12am

physics
(a) If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 3.43 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? m (b) Repeat for Mars, where the acceleration due to gravity...
Tuesday, September 18, 2012 at 12:14am

Physical Chemistry
The escape velocity, the velocity required by an object to escape from the gravitational field is given V^e = (2gr)^1/2 where r is the radius for Earth (6.37 x 10^6m). At what temperature will the c of an H2 molecule and of an N2 molecule attain the escape velocity?
Monday, September 17, 2012 at 3:42pm

6th grade science
What two parts of the earth system is a paleontologist involved in? Thanks
Sunday, September 16, 2012 at 8:58pm

science
if a rock undergoes high temperatures and high pressures deep within Earth, what new type of rock will be foremed? Assume that the rock does not melt
Sunday, September 16, 2012 at 8:33pm

math
It is estimated that one third of one per cent of the Earth’s surface receives more energy from the sun than the total projected needs for the year 2014. Assuming the Earth’s surface to be 1.97 x 108 square miles. Find the area in acres.
Sunday, September 16, 2012 at 7:27pm

Physics
Suppose a brick has a mass of 4.50 kg. What is the brick's weight at the surface of the Earth
Sunday, September 16, 2012 at 1:07pm

Physics
Air molecules create an upward force that impacts the free fall of objects on the surface of the Earth, differing form the way an object would fall in vacuum. Question: What kind of objects should be used for experimentation if we want to limit the impact on our experimental ...
Sunday, September 16, 2012 at 9:08am

physics
The earth moves around the sun in a nearly circular orbit of radius 1.50 1011 m. During the three summer months (an elapsed time of 7.89 106 s), the earth moves one-fourth of the distance around the sun.
Sunday, September 16, 2012 at 4:11am

physics
The earth moves around the sun in a nearly circular orbit of radius 1.50 1011 m. During the three summer months (an elapsed time of 7.89 106 s), the earth moves one-fourth of the distance around the sun.
Sunday, September 16, 2012 at 4:10am

Physics
A 4.51-kg object is thrown vertically upward from the surface of Earth, where the acceleration due to gravity is g1 = 9.81 m/s2. The initial velocity is v1, and the object reaches a maximum height of y1. What is the maximum height, y2, if the object is thrown with a speed of ...
Saturday, September 15, 2012 at 4:40pm

physics
An airplane with a speed of 88.0 m/s is climbing upward at an angle of 72.1 ° with respect to the horizontal. When the plane's altitude is 779 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
Saturday, September 15, 2012 at 4:06pm

Physics
If a satellite is orbitting the earth 710km above the earths surface, and it's velocity is 7,406.8 meters/sec, what is it's cetripedal acceleration??
Friday, September 14, 2012 at 11:29pm

earth
waste produced by people along the east coast of the united states has been dumped into the atlantic ocean where it is distriuted y surface ocean currents, Which coastel area is most liekly to become polluted by this waste?
Friday, September 14, 2012 at 8:35pm

physical science
the acceleration of gravity on the surface of venus is 8.9 m/s2. would a ball thrown upward from venus return to the ground sooner or later than a ball thrown upward with the same speed on the earth?
Friday, September 14, 2012 at 7:37pm

chemistry
"The sun emits UV radiation that can have serious health consequences. In particular, so-called UVB radiation is mostly absorbed by the ozone layer in the upper atmosphere (altitudes of 10 - 50 km), but the part that reaches the earth can cause DNA mutations. The highest ...
Friday, September 14, 2012 at 11:09am

Chemistry
"The sun emits UV radiation that can have serious health consequences. In particular, so-called UVB radiation is mostly absorbed by the ozone layer in the upper atmosphere (altitudes of 10 - 50 km), but the part that reaches the earth can cause DNA mutations. The highest ...
Thursday, September 13, 2012 at 11:19pm

math
It is estimated that one third of one per cent of the Earth’s surface receives more energy from the sun than the total projected needs for the year 2014. Assuming the Earth’s surface to be 1.97 x 108 square miles. Find the area in acres.
Thursday, September 13, 2012 at 9:46pm

5th grade math
The moon is about 240.000 miles from Earth. What is this distance written as a whole number multiplied by the power of ten?
Thursday, September 13, 2012 at 9:11pm

earth science
The gently sloping shallow area that extends from the continental shore is the called the continental?
Thursday, September 13, 2012 at 11:20am

physics
On Planet Y, the value of g is 12 m/s/s. If the human weighs 685 N on this planet, then how much woud he weigh on earth?
Wednesday, September 12, 2012 at 9:00pm

chemistry
If the sun is 150,000,000 km away, how many minutes does it take light to travel from the sun to the earth? Assume light travels at a speed of 3.0x10^10 cm/sec
Wednesday, September 12, 2012 at 5:27pm

AP Biology
1.Oparin and Haldane hypothesized that the Earth's early atmosphere was strongly (2 points) acidic. oxidizing. reducing. ~~ ionic. 2.The most significant outcome of the Miller and Urey experiments was that they (2 points) synthesized living cells from nonliving matter. ...
Wednesday, September 12, 2012 at 4:06pm

physics
Find the magnitude and relative direction (e.g., NE, NW, SE, SW) of the velocity of an airplane relative to the earth, if the velocity of the airplane relative to the air is 165 km/hr. south to north and the wind velocity is 65 km/hr. at an 50o angle from east to west.
Tuesday, September 11, 2012 at 10:14pm

Physics
If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 2.35 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? b) (b) Repeat for Mars, where the acceleration due to gravity is...
Tuesday, September 11, 2012 at 8:28pm

earth science
A swimmer completed the 1,500 meter freestyle in 625 seconds. What was his average speed?
Tuesday, September 11, 2012 at 5:45pm

English
I have to analyze John F. Kennedy's inaugural address. I need to find the thesis, preview statement (forecasting or signposting), because statement (why the audience might be interested in listening), transitions, a restatement of thesis, and a clincher. Here is the text ...
Monday, September 10, 2012 at 6:36pm

Biology 1
Briefly describe the basic characterisitics that all living things on Earth have in common.
Monday, September 10, 2012 at 6:07pm

Precalculus
Find the distance along an arc on the surface of the earth that subtends a central angle of 1 minute. (1 minute = 1/60 degree) This is a nautical mile. Note that the radius of the Earth is 3960 miles and there are 1760 yards in a mile. Express your answer in both miles and yards.
Monday, September 10, 2012 at 5:18pm

geography
Will you check my answers for me? 1. How many states are part of the contiguous United States? 48 states 2. Is the Tropic of Cancer north or south of the equator? North of the Equator 3. What are the names of the Earth's continents? North America, South America, Antarctica...
Monday, September 10, 2012 at 5:14pm

electric engineering
An aircraft has a wing span of 56 m. It is flying horizontally at a speed of 900 km/hr and the vertical component of earth’s magnetic field is 0.4 m Wb/m2. Calculate the P.D between the wing tips of the air craft
Monday, September 10, 2012 at 2:50pm

Chemistry
What does the reaction of alkaline earth metals with water tell you? Thanks in advance.
Sunday, September 9, 2012 at 3:03pm

Physics
What is the speed of the rocket when it is 350 above the surface of the earth? A rocket starts from rest and moves upward from the surface of the earth. For the first 10 of its motion, the vertical acceleration of the rocket is given by a(y)=2.9, where the -direction y+ is ...
Sunday, September 9, 2012 at 12:39pm

physics
a boy throws a stone straight upward with an initial speed of 15 m/s on the surface of the earth. what maximum height above the starting point will the stone reach before falling back down?
Saturday, September 8, 2012 at 10:58am

earth science
What are 10 facts about hurricane Isaac?
Friday, September 7, 2012 at 7:02pm

world geography
Where on Earth? which of the 12 northern eurasian cities will be the home of your company's newest restaurant? hint: use information from an atlas and al almanac to eliminate all but one city
Friday, September 7, 2012 at 12:11am

earth
how long will it take Uranium-238 for there to ne 25% of the original radioactive period to be left? i need this question answered ASAP!!!!!(:
Thursday, September 6, 2012 at 9:05am

earth
The weight (V) of an object on Venus varies directly as its weight (E) on Earth. A person weighing 120 lb on Earth would weigh 106 lb on Venus. How much would a person weighing 180 lb on Earth weigh on Venus?
Wednesday, September 5, 2012 at 2:50pm

Math
A year on Mars is 686 Earth Days. (1) Which is longer, a year on Mars or a year on Earth? (2)By how many weeks is it longer? Submit two answers. Please explain how you got the answers. My 1st answer was Mars the 2nd answer I 82 1/2 weeks. Please help
Wednesday, September 5, 2012 at 10:59am

math
A year on Mars is 686 Earth Days. (1) Whicch is longer, a year on Mars or a year on Earth. (2) By how many weeks is it longer? Please explain how you got the answer. My answer was 82 1/2 weeks longers
Tuesday, September 4, 2012 at 9:33pm

Science
If on earth you weigh 420 newtons, and the gravitational pull on the moon is 1/6 of what it is on earth. What would be your weight on the moon?? Please show work Thanks!! :)
Tuesday, September 4, 2012 at 8:46pm

physics
A red ball is thrown down with an initial speed of 1.2 m/s from a height of 25.0 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 22.9 m/s, from a height of 0.8 meters above the ground. The force of ...
Monday, September 3, 2012 at 8:39pm

college
A blue ball is thrown upward with an initial speed of 19.8 m/s, from a height of 0.5 meters above the ground. 2.4 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 7.9 m/s from a height of 22.5 meters above the ground. The force of ...
Monday, September 3, 2012 at 7:33pm

physics
if the radius of the earth is 6.37 times 10 to the third power in km, what is the speed in km/h resulting from the rotation of earth of a person standing on the equater. then, convert the answer to m/s.
Friday, August 31, 2012 at 3:08pm

Math
The earth is approximately a sphere. It's diameter is about 12730km. Water covers approximately 66% of the earths surface. How many square kilometers of land covers the earths?
Friday, August 31, 2012 at 1:36am

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