Wednesday
June 19, 2013

# Homework Help: Science: Earth

Physics tough
If approximately 70% of the Earth's surface is covered with water, what is the order of magnitude for the number of raindrops in the world's oceans? Hint: The order of magnitude of 2478=2.478×10^3 is 3.
Wednesday, June 19, 2013 at 2:19am

physics
a polar satellite is launched at 850 km above Earth .find its orbital speed.
Tuesday, June 18, 2013 at 11:18am

electronics technician
19. In a solenoid, where is the magnetic field strongest? A. Outside the coil C. At the north pole B. Inside the coil D. At the south pole 20. What is a typical coil voltage for a low-voltage relay circuit? A. 2 VDC C. 12 VDC B. 5 VDC D. 120 VDC 21. Electromagnetic stepping ...
Tuesday, June 18, 2013 at 10:26am

math
A mason's assistant's rate of pay is \$0.75 per cubic foot of earth moved. He moves 220 cubic feet of earth to dig a trench. What is his pay for this job? THE ANSWER IS NOT &330
Monday, June 17, 2013 at 2:36pm

Math
PLEASE HELP !!! A mason is putting in the foundation for a wall. His assistant digs a trench in roughly the shape of a rectangular solid measuring 50 ft. in length, 12 inches deep along both sides, and 12 inches wide at the top and bottom. How many cubic feet of earth did he ...
Monday, June 17, 2013 at 12:28pm

math
1.Mark makes Php 40.00 per hour if he works 40 hours or less.If works overtime,he makes an additional Php 5.00 per hour as overtime pay.What would be his total pay if he worked 58 hours? 2.The world's greatest known ocean depth of 36,201 feet was recorded in the Marianas ...
Monday, June 17, 2013 at 5:16am

physics
The free-fall acceleration on the surface of Jupiter is about two and one half times that on the surface of the Earth. The radius of Jupiter is about 11.0 RE (RE = Earth's radius = 6.4 106 m). Find the ratio of their average densities, ρJupiter/ρEarth.
Sunday, June 16, 2013 at 1:10pm

Physics
A centrifuge can be used to separate cells from a liquid. To increase the rate at which objects can be separated from solution, it is useful to make the centrifuge's speed as large as possible. If you want to design a centrifuge of diameter 1.4 m to have a force of 128,000...
Friday, June 14, 2013 at 12:39pm

Physics
A skydiver is jumping from an airplane traveling at 10.0 m/s. The plane is 3520 m above the earth. The sky diver pulls his cord at 1760 m above the earth. Neglecting air resistance, how far does the skydiver travel horizontally before pulling the cord?
Friday, June 14, 2013 at 11:15am

Science
What is the circular velocity of an Earth satellite 1000. km above Earth's surface? (Note: Earth's average radius is 6371 km.)
Thursday, June 13, 2013 at 10:09pm

Science
Compared with the strength of Earth's gravity at its surface, how much weaker is gravity at a distance of 10 Earth radii from Earth's center? At 20 Earth radii?
Thursday, June 13, 2013 at 10:08pm

space
Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is whisked away in a space ship at 90% of the speed of light. After 65 years they are reunited. Will they look the same? Show proof of your answer through ...
Thursday, June 13, 2013 at 1:05am

physics
1.descibe the construction and working of machine used to generate high voltage? 2.draw electric lines between the plates of a parallel plate capacitor with 1(air) and 2(dielectric) as a medium? 3.near the surface of earth the field is about 100V/m. why do we then not ...
Monday, June 10, 2013 at 10:46am

biology
Explain how life on earth is dependent on both polarity of covalent chemical bonds and hydrogen bonding. Reference water, proteins and nucleic acids in your answer.
Sunday, June 9, 2013 at 4:42pm

physics
The furthest distance from the Sun to Earth is df=1.521E8 The shortest distance from the Sun to Earth is ds=1.47E8 To simplify the problem, assume that the Earth's axis is always perpendicular to the plane of its trajectory around the Sun. The Sun always shines on half of ...
Sunday, June 9, 2013 at 12:17am

physics
Estimate the time difference between the longest amount of daylight in one day and the shortest amount of daylight on one day in seconds over the course of a year if you lived on the Earth's equator
Sunday, June 9, 2013 at 12:12am

Biology
Explain how life on earth is dependent on both polarity of covalent chemical bonds and hydrogen bonding.
Friday, June 7, 2013 at 7:12pm

Earth science
Why are so few alternative sources of energy in use in the united states today??
Thursday, June 6, 2013 at 2:34pm

Earth science
In what ways do earths system interact with each other
Thursday, June 6, 2013 at 1:27pm

HELP!!! Math
The weight of an object on Earth varies directly as the weight of the same object on the moon. A 300 pound object would weight 48 pound on the moon. How muchg would a 65 pound object weigh on the moon?
Wednesday, June 5, 2013 at 6:25pm

heeeeeeeeeeeelp physics
Estimate the time difference between the longest day and the shortest day of a year in seconds if you lived on the Earth's equator with the assumptions below. Note: this is not the difference between solstices as we are adjusting the earth's rotation axis to be in the ...
Wednesday, June 5, 2013 at 4:11am

heeeeeeeeeeeelp physics vrey tough
Estimate the time difference between the longest day and the shortest day of a year in seconds if you lived on the Earth's equator with the assumptions below. Note: this is not the difference between solstices as we are adjusting the earth's rotation axis to be in the ...
Tuesday, June 4, 2013 at 7:45pm

Trigonometry
Could someone please help me out with this? I've read my text book, but can't seem to figure it out. And could you please show me how to do them? The Earth travels in a circular orbit around the Sun at 29.79 km/sec. If the radius of the orbit is 1.496 x 10^8 km, what ...
Tuesday, June 4, 2013 at 3:48pm

Phyics Toughest question on earth
Estimate the time difference between the longest day and the shortest day of a year in seconds if you lived on the Earth's equator with the assumptions below. Note: this is not the difference between solstices as we are adjusting the earth's rotation axis to be in the ...
Tuesday, June 4, 2013 at 1:42am

s
According to science, the fastest speed possible for anything is the speed of light. The speed of light is about 186,000 miles per second. That means that in one minute, light travels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from ...
Monday, June 3, 2013 at 12:12am

earth science
If a sample contains 50g of carbon14 and 50g nitrogen14 how many half lives has it undergone?
Saturday, June 1, 2013 at 3:37pm

Biology
How does the structure of Earth’s interior affect seismic waves?
Friday, May 31, 2013 at 3:10am

physics
A spaceship travels with a speed of 0.3c as it passes by the Earth on its way to a distant star, as shown in the diagram below. The pilot of the spaceship measures the length of the moving ship as 40 m. 0.3 c Earth Determine its length as measured by a person on Earth. Answer ...
Wednesday, May 29, 2013 at 12:52am

physics
I need help! i don't know how to do this problem. average atmospheric pressure at earth's surface is 1.01 x 10^5 N/m^2. Earth's radius is 6.37 x 10^6m. Show that the total weight of earth's atmosphere is about 5.15 x 10^19 N.
Tuesday, May 28, 2013 at 8:23pm

1. The atmosphere of Earth is an example of a ______solution.(1point) liquid-liquid gas-liquid gas-gas** solid-liquid Am I correct?
Monday, May 27, 2013 at 10:31pm

Eng
Which one of the following statements is an example of a complex sentence? A. Neap tide is the best time for digging clams. B. Sparrows as the bird feeder compete for seeds. C. The earth was spinning when Lucas firs saw Lucille. D. The crescent moon is a symbol of Islam. ...
Monday, May 27, 2013 at 1:46pm

chemistry
how much heat would be required to warm the earth's oceans by 1 degree celcius if the volume of the earths oceans is 137x100000000km3 and the density of the seawater is 1.03g/cm3
Saturday, May 25, 2013 at 6:44pm

PHYSICS FINAL (orbital)
A 3300kg satellite is traveling 3550 km above the Earth's surface. Calculate the velocity and period of the satellite. THANK YOU VERY MUCH!!!!
Wednesday, May 22, 2013 at 10:44pm

A 3300kg satellite is traveling 3550 km above the Earth's surface. Calculate the velocity and period of the satellite. THANK YOU VERY MUCH!!!!
Wednesday, May 22, 2013 at 10:44pm

PHYSICS SATELLITE PROBLEM
A 3300kg satellite is traveling 3550 km above the Earth's surface. Calculate the velocity and period of the satellite. THANK YOU VERY MUCH!!!!
Wednesday, May 22, 2013 at 9:22pm

Physics
The average energy flux in the sunlight on the Earth is ⟨S⟩=1.4×103 W/m2. You might need to use some of the following constants: Distance from earth to the sun=AU=150×109m REarth=6.4×106m RSun=7.0×108m G=6.67×10−11m3/(kgs2) ...
Wednesday, May 22, 2013 at 7:24pm

algebra
The question I have is to solve the problem. A model rocket is launched from the ground with an initial speed of 50 feet per second. The equation that models its height, h feet, off the ground t seconds after it was fired is h=-16ft^2+50t a)How high is the rocket 1 seconds ...
Tuesday, May 21, 2013 at 5:12pm

Science Help
mass = 4.5 kg Compare and contrast the mass and weight of this bowling ball on Earth and the moon.
Tuesday, May 21, 2013 at 2:31pm

Physics
Take an average 82 kg pet frog, what's it weight on earth? What is it's weight on the moon?
Monday, May 20, 2013 at 8:32pm

Physics
The radius of planet X is 5.0 bleems. It takes 4 earth years to complete it's orbit. Another planet, Z, orbits the same sun and has an orbit with the radius of 12 bleems. How long does it take for planet Z to complete an orbit?
Saturday, May 18, 2013 at 5:09pm

Science
Explain the law of motion needed to solve thisproblem . On Planet Zorg, a 30 kg barbell can be lifted by only exerting a force fo 180N. What is the acceleration of gravity on Planet zorg? Predict how the motion of this object would change if on earth.
Saturday, May 18, 2013 at 12:39pm

physics
explain the law of motion needed to slove this problem. On Planet Zorg, a 30kg barbell can be lifted by only exerting a force of 180N. what is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change on earth.
Saturday, May 18, 2013 at 10:37am

science
in which direction are nearly all galaxies moving relative to earth
Thursday, May 16, 2013 at 5:09pm

Science
Is the near side (facing earth)always the dark side?
Wednesday, May 15, 2013 at 12:33pm

physics
thus far in the course we have ignored that on the earths surface an object must have a slightly unbalanced force to rotate with the earth, pretending that the normal force precisely balances the objects weight. A student with a mass of 65.0kg stands at the equator. The radius...
Tuesday, May 14, 2013 at 8:05pm

physics
the space shuttle typically orbits 400 km above the earths surface. The earth has a mass of 5.98 * 10^24 kg and a radius of 6380km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttles cargo bay? B)Use your result ...
Tuesday, May 14, 2013 at 7:54pm

chem
1. The total power used by humans worldwide is approximately 15 TW (terawatts). Sunlight striking the Earth provides 1.336 kW per square meter (assuming no clouds). The surface area of Earth is approximately 197,000,000 square miles. How much of Earth’s surface would we ...
Tuesday, May 14, 2013 at 3:48pm

Physics to Elena
At the upper surface of the earth's atmosphere, the time-averaged magnitude of the Poynting vector is referred to as the solar constant and is given by </S/>=1.35×103W⋅mͨ​2;2 . (a) If you assume that the sun's electromagnetic radiation is a ...
Tuesday, May 14, 2013 at 4:38am

Physics
At the upper surface of the earth's atmosphere, the time-averaged magnitude of the Poynting vector is referred to as the solar constant and is given by </S/>=1.35×103W⋅mͨ​2;2 . (a) If you assume that the sun's electromagnetic radiation is a ...
Monday, May 13, 2013 at 6:20am

Symbolic Logic
Even if you know only some of them please help! 1. Give a proof of the following: (∀F)( (P)( [ιxGx][Px] ⊃ F(P) ) ⊃ F(G)) (∃F)( (P)( F(P) ≡ [ιxGx][Px]) Therefore, E!(ιxGx) 2. Prove the following: [ιxMx][Thales believed that Bx...
Sunday, May 12, 2013 at 11:26pm

physics
Earthquakes are motions of the earth's crust. Essentially, they are big sound waves that travel through the earth. There are two types of waves. The first type is called a longitudinal or P wave, where the earth compresses in the same direction as the wave travels. The ...
Thursday, May 9, 2013 at 2:55am

Physics
At the upper surface of the earth's atmosphere, the time-averaged magnitude of the Poynting vector is referred to as the solar constant and is given by </S/>=1.35×103W⋅mͨ​2;2 . (a) If you assume that the sun's electromagnetic radiation is a ...
Wednesday, May 8, 2013 at 4:08pm

physics
Two stars are 2.4 × 1011 m apart and are equally distant from the earth. A telescope has an objective lens with a diameter of 1.72 m and just detects these stars as separate objects. Assume that light of wavelength 590 nm is being observed. Also, assume that diffraction ...
Tuesday, May 7, 2013 at 7:37pm

SCIENCE
IF SOMEONE WHEIGHS 12 KG ON THE MOON SO HOW MUCH HE WILL WEIGH ON THE EARTH
Tuesday, May 7, 2013 at 11:04am

Physics
A 69-kg base runner begins his slide into second base when he is moving at a speed of 3.7 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
Tuesday, May 7, 2013 at 7:59am

A hydrogen atom, when vigorously perturbed, can emit light with a frequency of 6.16·1014 Hz. When the same light from hydrogen atoms in a distant galaxy is observed on earth, the frequency is 5.76·1014 Hz. Calculate the speed at which the galaxy is receding from ...
Monday, May 6, 2013 at 10:29am

Physics
a. 2 objects each of mass 200 kg and 500 kg are separated by 50 cm. Where body of mass 20 kg should be placed so that the resultant force of gravity experienced by objects equal to zero? b. launched a rocket leaving Earth. Known radius of the earth 6.4 x 10 ³ km and ...
Monday, May 6, 2013 at 7:03am

English
This question is based on the following poem: Seasons are celebrations. A year's a Ferris wheel. Both honor our world's habit of spinning 'round a star. 7. Which one of the following sentences best expresses the main idea of this poem? A. The world has a habit of ...
Saturday, May 4, 2013 at 10:32pm

Physics
A 69-kg base runner begins his slide into second base when he is moving at a speed of 3.7 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
Friday, May 3, 2013 at 5:27pm

earth science
Why do deciduous trees lose their leaves in the fall?
Friday, May 3, 2013 at 1:57am

Science
Does the energy move from Earth’s surface and atmosphere out to space through radiation, conduction, or convection? Explain.
Thursday, May 2, 2013 at 3:32pm

Physics!
Imagine a giant dry-cleaner's bag full of air at a temperature of -31 floating like a balloon with a string hanging from it 15 above the ground. Estimate what its temperature would be if you were able to yank it suddenly back to Earth's surface.
Thursday, May 2, 2013 at 2:24pm

Physics
Some communication satellites are put into a circular geosynchronous orbit in which the satellite remains above a certain position on the earth's equator as it orbits. Such a satellite would always be in the same position in the sky as seen from the transmitting or ...
Wednesday, May 1, 2013 at 9:25pm

physical science
define earth station
Monday, April 29, 2013 at 11:46am

12th
an electron above the earth is balanced by the gravitational force and the electric field of the earth. find the electric field of the earth.
Saturday, April 27, 2013 at 9:12am

physics for physical science
(a)what is the magnitude of the gravitational force of the earth on a surveillance satellite of mass 1040kg that is in a grazing circular orbit 100 km above the surface of the earth. (b)find the magnitude of the acceleration of the satellite in such a grazing orbit. (c)...
Friday, April 26, 2013 at 11:27am

Physics/Astronomy
A pulsar is a stellar object that emits light in short bursts. Suppose a pulsar with a speed of 0.975c approaches Earth, and a rocket with a speed of 0.999c heads toward the pulsar (both speeds measured in Earth’s frame of reference). If the pulsar emits 20.0 pulses per ...
Thursday, April 25, 2013 at 2:01am

Science..physics
The moon is the Earth's nearest neighbour in space. The radius of the moon is approximately one quarter of the Earth's radius, and its mass is one eightieth of the Earth's mass. a) Culculate the weight of a man with a mass of 80kg on the surface of the moon. b) ...
Wednesday, April 24, 2013 at 4:17pm

the equatorial radius of the earth is approximately 3960 miles. suppose a wire is wrapped tightly around the earth at the equator. how much must this wire be lengthened if it is to be strung on 10 feet poles above the ground? (1 mile=5280 feet) delta y= dy/dx (2pir) * deltax ...
Wednesday, April 24, 2013 at 2:20pm

earth
On the windward side of the mountain, should the relative humidity of the parcel change as it rises from 2000 m to 4000 m?
Tuesday, April 23, 2013 at 2:56pm

Optics/Physics
Predict the size of the image of Jupiter if photographed at opposition with a lens having a focal length of 9600 mm. (Assume Jupiter is a disk of 1.43 x 10^5 km and is 6.29 x 10^8 km from the Earth.)
Tuesday, April 23, 2013 at 1:55pm

physics
A satellite is placed between the Earth and the Moon, along a straight line that connects their centers of mass. The satellite has an orbital period around the Earth that is the same as that of the Moon, 27.3 days. How far away from the Earth should this satellite be placed?
Tuesday, April 23, 2013 at 11:47am

physics
A spy satellite was launched into a circular orbit with a height of 599 km above the surface of the Earth. Determine its orbital speed and period. (The mass of the Earth is 5.97 1024 kg, and the radius of the Earth is 6370 km.)
Tuesday, April 23, 2013 at 11:46am

physics
A satellite is in circular orbit around the Earth at a distance of 4.74RE with a speed of 3.63 km/s. With what speed would the satellite hit the Earth's surface if somehow it suddenly stopped and fell to Earth? Ignore air resistance.
Tuesday, April 23, 2013 at 11:46am

Optics
Predict the size of the image of Jupiter if photographed at opposition with a lens having a focal length of 9600 mm ( Assume Jupiter is a disk of 1.43 x 10^5 km and is 6.29 x 10^8 km from the earth).
Monday, April 22, 2013 at 8:01pm

Physics/Astronomy
Predict the size of the image of Jupiter if photographed at opposition with a lens having a focal length of 9600 mm ( Assume Jupiter is a disk of 1.43 x 10^5 km and is 6.29 x 10^8 km from the earth).
Monday, April 22, 2013 at 6:15pm

physics
4(a) What is the magnitude of the gravitational force of the Earth on a surveillance satellite of mass 1040 kg that is in a grazing circular orbit 100 km above the surface of the Earth. (b) Find the magnitude of the acceleration of a satellite in such a grazing orbit. (c) ...
Monday, April 22, 2013 at 3:29pm

Physics
Climbing to the top of Mount Everest is hard. But, it's slightly easier than you might think as people weigh less as they climb to the top. Let WE be a person's weight on top of Mount Everest and WS be their weight at sea level. What is the value of 1−WE/WS? ...
Monday, April 22, 2013 at 3:55am

Physics (G and g)
Please, I need help with this problem. I would really appreciate it. The top of Mt. Everest is 8850 m above sea level. Assume that sea level is at the average Earth radius of 6.38×106 m. What is the magnitude of the gravitational acceleration at the top of Mt. Everest? ...
Sunday, April 21, 2013 at 7:20pm

physics (Newton"s law of gravitation)
Could anyone please help me with this problem? I would really appreciate it. The top of Mt. Everest is 8850 m above sea level. Assume that sea level is at the average Earth radius of 6.38×106 m. What is the magnitude of the gravitational acceleration at the top of Mt. ...
Sunday, April 21, 2013 at 6:37pm

Calculus
A University of Rochester student decided to depart from Earth after his graduation to find work on Mars. Before building a shuttle, he conducted careful calculations. A model for the velocity of the shuttle, from liftoff at t = 0 s until the solid rocket boosters were ...
Sunday, April 21, 2013 at 2:19pm

Mechanics:Statics
Two 10 kg spheres are placed 500mm apart. Express the gravitational attraction acting on one of the spheres as a percentage to its weight on earth.
Friday, April 19, 2013 at 6:06am

Statics
Two identical spheres of radius 80mm and mass 2 kg on the surface of the earth are placed in contact. Find the gravitational attraction between them.
Friday, April 19, 2013 at 6:03am

Mechanics:Statics
A man weighs 900N on the surface of the earth. Compare his weight in an airplane flying at an elevation of 9000m. Note that the radius of Earth is 6378km.
Friday, April 19, 2013 at 5:59am

simple PHYSICS
The space shuttle had a top orbital speed of 8000 m/s and orbited in a circular orbit approximately 320 km above the earth's surface. How long was one orbit in seconds?
Thursday, April 18, 2013 at 4:20am

Physics
In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the magnitude of the earth...
Tuesday, April 16, 2013 at 1:40pm

physics
The space shuttle had a top orbital speed of 8000 m/s and orbited in a circular orbit approximately 320 km above the earth's surface. How long was one orbit in seconds?
Tuesday, April 16, 2013 at 11:54am

The space shuttle had a top orbital speed of 8000 m/s and orbited in a circular orbit approximately 320 km above the earth's surface. How long was one orbit in seconds? Details and assumptions The radius of the earth is 6370 km.
Tuesday, April 16, 2013 at 3:37am

URGENT PLZ IT WILL ONLY TAKE A-SEC. SCIENCE!!!!!!!
1. Drought, fewer plants, and fewer nesting sites are examples of __________. (1 point) limiting factors biotic factors abiotic factors population density 2. As you move from level to level in an energy pyramid, energy ____. (1 point) decreases increases stays at the same ...
Tuesday, April 16, 2013 at 2:05am

Physics
A satellite is orbiting the earth just above its surface. The centripetal force making the satellite follow a circular trajectory is just its weight, so its centripetal acceleration is about 9.81 m/s2 (the acceleration due to gravity near the earth's surface). If the earth...
Monday, April 15, 2013 at 9:13pm

English
1. Which of the following would not be a good strategy for delivering a speech? Make sure your presentation equipment is running properly. *Start talking over the audience to quiet them down. Use correct grammar and well-formed sentences. Look directly at the members of your ...
Monday, April 15, 2013 at 4:34pm

physics
A radio station on the surface of the earth radiates an EM-wave with an average total power of 50 kilo-watts. Assuming the transmitter radiates equally in all directions (not in real life), find the amplitudes Emax and Bmax detected by a satellite at a distance of 100km from ...
Monday, April 15, 2013 at 12:59pm

Physics
A satellite circling the earth completes each orbit in 5.10 x 10^3 s. What is the gravitational field strength @ the location of the satellite's orbit?
Sunday, April 14, 2013 at 8:23pm

Physics
A satellite circling the earth completes each orbit in 5.10 x 10^3 s. What is the gravitational field strength @ the location of the satellite's orbit?
Sunday, April 14, 2013 at 5:13pm

chemistry
The escape velocity from earth is 2.5 x10^4 miles per hour. What is this speed in m/s? (1 mile 1609 m)
Sunday, April 14, 2013 at 1:55pm

Physics
A projectile is fired vertically from Earth's surface with an initial speed v0. Neglecting air drag, how far above the surface of Earth will it go? (Use any variable or symbol stated above along with the following as necessary: ME for the mass of the Earth, rE for the ...
Thursday, April 11, 2013 at 11:15pm

physics
During a thunderstorm, the separation between the clouds and the earth acts as a giant capacitor with a capacitance of 2,500 µF (µ is the SI prefix for 10-6). If a tower is struck by a lightning bolt that releases 50 C of charge, how much energy is released?
Thursday, April 11, 2013 at 10:49pm

physics
A rocket cruising past earth at 0.800c shoots a bullet out the back door,opposite the rocket's motion,at 0.900c relative to the rocket. What is the bullet's speed relative to the earth?
Thursday, April 11, 2013 at 5:50pm

Physics
A small mirror is attached to a vertical wall, and it hangs a distance of 1.81 m above the floor. The mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. The incident and reflected rays lie in a plane ...
Thursday, April 11, 2013 at 8:11am

Physics
A small mirror is attached to a vertical wall, and it hangs a distance of 1.81 m above the floor. The mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. The incident and reflected rays lie in a plane ...
Wednesday, April 10, 2013 at 4:58pm

Science
What are some of the effects of the sun's radiation on the earth's atmosphere including the green house effect, conduction, convection and radiation?
Wednesday, April 10, 2013 at 3:49pm

physics
The auroral zone is defined by the last field line from the Earth that returns to the Earth. If the field of the earth extends no further than 10RE in the sunward direction, at what angle (in degrees) in the picture above does the last field line that returns to the earth on ...
Wednesday, April 10, 2013 at 3:36pm

Physics
A small mirror is attached to a vertical wall, and it hangs a distance of 1.81 m above the floor. The mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. The incident and reflected rays lie in a plane ...
Wednesday, April 10, 2013 at 3:24pm

Physics
Which exerts more gravitational force on the baby, Mars or the obstetrician, given that Mars has a mass of 6.4 1023 kg and is 8. 1010 m from Earth?
Wednesday, April 10, 2013 at 2:04pm

Physics
Calculate the force of gravity between a human child (mass = 38 kg) and the planet Mars (mass = 6.4 1023 kg), when Mars is at its closest to Earth (distance = 8. 1010 m).
Wednesday, April 10, 2013 at 2:01pm

math
Asia is about 3 times the size of antarctica together the 2 continents make up 2/5 of earth's land . what fraction of earth's land does antarctica make up?
Tuesday, April 9, 2013 at 9:58pm

physics problem!!
If the water molecules in 5.70 g of water (H2O) were distributed uniformly over the surface of the Earth, how many such molecules would there be on 1.40 cm2 of the Earth's surface? -Molar mass Hydrogen gas(H2)=2.02 g/mol -Molar mass Oxygen gas (O2) = 32.0 g/mol -Radius of ...
Tuesday, April 9, 2013 at 7:22am

physics
Suppose the Sun is 1.52669 × 108 km from Earth. The speed of light is 2.99792 × 108 m/s. How long does it take for its light to reach us? Answer in units of min
Monday, April 8, 2013 at 7:38pm

physical science
The orbital velocity of an earth satellite in an orbit 400 mi above the earth?
Monday, April 8, 2013 at 4:59pm

Physics
In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the magnitude of the earth...
Monday, April 8, 2013 at 3:20pm

Physics
You drop a 1.60 kg book to a friend who stands on the ground at distance D = 12.0 m below. If your friend's outstretched hands are at distance d = 1.40 m above the ground (see the figure), (a) how much work Wg does the gravitational force do on the book as it drops to her ...
Sunday, April 7, 2013 at 8:59pm

physics
The Earth has a radius of about 6.38 ´ 103 kilometers at the equator and rotates 360° every 24 hours. The angular displacement of a person standing at the equator for 8.0 hours is:
Sunday, April 7, 2013 at 3:07pm

physics
A L=3 mile long conducting cable tethers a satellite to the International Space Station. The Cable moves through the Earth' magnetic field of about B=0.02 Gauss at a speed of v=8 km/sec. The cable points radially from the Space Station to the satellite. The ISS moves ...
Sunday, April 7, 2013 at 5:23am

Maths
A 40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form a platform of dimensions 28m by 22m.find the hight of the platform.
Sunday, April 7, 2013 at 4:11am

Maths
A 40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form a platform of dimensions 28m by 22m.find the hight of the platform.
Sunday, April 7, 2013 at 4:09am

Maths
A 40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form a platform of dimensions 28m by 22m.find the hight of the platform.
Sunday, April 7, 2013 at 4:08am

Maths
A 40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form a platform of dimensions 28m by 22m.find the hight of the platform.
Sunday, April 7, 2013 at 4:07am

Physics
For parts A-C: /^Vo | 2M | velocity into pg. ->R )2m ) ------ top view rear view A car of mass, 2m, is going around a turn at a constant radius, R, with velocity, v0. The turn is not banked – it is a flat surface. Assume the car and the road are on Earth’s surface...
Saturday, April 6, 2013 at 1:00pm

Physics
For this problem, you are allowed to consult with other members of the class, but not with faculty and not with anyone outside the course. Simplify all your expressions. A car of mass, 2m, is going around a turn at a constant radius, R, with velocity, v0. The turn is not ...
Saturday, April 6, 2013 at 12:48pm

physics
Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 478 nm, determine the number of photons per second per square meter that reach the earth.
Saturday, April 6, 2013 at 1:31am

Physics
The equation describing the (r, \theta ) coordinates of points along a single field line of a magnetic dipole is r=R_0 \sin ^2(\theta ) where \theta =0 is in the direction of the dipole moment and R_0 is a constant which is different for each field line. The question requires...
Saturday, April 6, 2013 at 12:14am

Science
Describe the geomorphic processes that shape the Earth’s surface. Use the Yosemite Valley to explain one or more of those processes.
Friday, April 5, 2013 at 7:03pm

World Geography
REVIEW 1.How do lines of latitude and longitude help geographers study Earth? A. These lines show geographers the direction of Earth’s rotation around the sun. B. These lines help geographers see the difference between oceans and landforms on Earth’s surface. C. ...
Friday, April 5, 2013 at 3:31pm

PHYSICS
Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 478 nm, determine the number of photons per second per square meter that reach the earth.
Thursday, April 4, 2013 at 10:05pm

physics
A man of mass 78.5 kg walks down the aisle of an airplane at a speed of 1.40 m/s in the forward direction while the plane moves at a speed of 320 m/s relative to the earth. (a) Find the man's kinetic energy relative to the plane. (b) Find the man's kinetic energy ...
Thursday, April 4, 2013 at 5:13pm

Physics
The earth's Field is Roughly equivalent to an axial centered dipole. Find the vertical rate of change of the vertical component of the earth's field in gammas/foot here at flagstaff. Given" vertical component of earth's magnetic field at flagstaff is equal to ...
Tuesday, April 2, 2013 at 9:00pm

Earth science
Earth’s troposphere, hydrosphere, and lithosphere contain relatively large amounts of which element?
Tuesday, April 2, 2013 at 6:02pm

Earth science
Waste produced by people along the East Coast of the United States has been dumped into the Atlantic Ocean where it is distributed by surface ocean currents. Which coastal area is most likely to become polluted by this waste?
Tuesday, April 2, 2013 at 5:55pm

physics111
a river flows due south with a speed of 2.0m/s. a man steers a motorboat across the river;his velosity is 4.2m/s due east.the river is 800m wide. (A) what is his velocity(magnitude and direction)relative to the earth? (B)how much time is required to cross the river?
Tuesday, April 2, 2013 at 9:33am

chemistry
Suppose you take a trip to a distant universe and find that the periodic table there is derived from an arrangement of quantum numbers different from the one on Earth. The rules in that universe are: 1. principal quantum number n = 1, 2, . . . (as on Earth); 2. angular ...
Tuesday, April 2, 2013 at 6:53am

Science ASAP
1. Angiosperms have organs such as ______________ and produce seeds. The are described as _________________plants. (1 point) flowers; vascular stems; pollinated rhizoids; vascular leaves; non-vascular 4. Of the following, which is NOT a characteristic of vascular plants? (1 ...
Monday, April 1, 2013 at 9:07pm

science
If a scale model of the planets are built with Earth's diameter set to 10 centimeters, how big would the model of Jupiter have to be in centimeters?
Monday, April 1, 2013 at 5:18pm

Physics
A 45-m length of wire is stretched horizontally between two vertical posts. The wire carries a current of 67 A and experiences a magnetic force of 0.15 N. Find the magnitude of the earth's magnetic field at the location of the wire, assuming the field makes an angle of 51....
Monday, April 1, 2013 at 2:44pm

Math
The gravitational acceleration, g, on the Earth is proportional to the mass, M, of the Earth and inversely proportional to the square of the distance, r, from the Earth's center. If the gravitational acceleration on the center of the Earth is 9.8 m/s^2, what is the ...
Monday, April 1, 2013 at 1:51pm

Science Physics
An object weighs 12 N on earth. When it is brought to Mars, it has a weight of 4.8 N. What is the acceleration due to gravity on Mars? (Taking the acceleration due to gravity on earth is 10 m/s²)
Monday, April 1, 2013 at 10:17am

geology
If the tilt of the earth’s axis increased to 30 degrees, which of the following statements would be correct? (a) There would likely be a greater variation between summer and winter positions of the Sub Tropical Ridge. (b) Summers are likely to become cooler and winters ...
Monday, April 1, 2013 at 5:54am

Math
the mass of earth is 5.97 x 10^24 kilograms. The mass of the moon is 7.34 x 10^22 kilograms. Part A: What is the combined mass of earth and the moon? express your answer in scientific notation. Part B: How many times greater is the mass of earth than the mass of the moon? ...
Sunday, March 31, 2013 at 3:12pm

math
The ocean covers about 71% of the Earth’s surface. If the total surface area of the Earth is about 510 million square kilometers, how many square kilometers are covered by the ocean?
Thursday, March 28, 2013 at 10:33pm

pre calculus
Write the equation of the circle in standard form. Find the center, radius, intercepts, and graph the circle. x^2+y^2-12x-4x+36=0 How on earth do I do this?
Thursday, March 28, 2013 at 8:58pm

History
1. What did the baby boom generation value? (1 point) traditional, mainstream values trust in adults and the government youth, spontaneity, individuality, and spirituality restriction of minority civil rights and less environmental regulation 2. How did the counterculture ...
Wednesday, March 27, 2013 at 9:09pm

Physics
Satellites A and B are in circular orbits, with A two and a half times as far from earth's center as B. How do their orbital periods compare?
Wednesday, March 27, 2013 at 12:48pm

sience
How would life be different without resources taken for under earth's surface?
Tuesday, March 26, 2013 at 8:07pm

Physics
The power radiated by the sun is 3.90 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.50 1011 m. The earth's axis of rotation is tilted by 27° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator ...
Tuesday, March 26, 2013 at 4:32pm

Science
About 10 percent of the earth’s surface are covered with glaciers today. Where are most of these glaciers found
Tuesday, March 26, 2013 at 4:01pm

Science
What is Earth's surface (sea level)? Its pressure is 14.7 psi. That is what is the number of ft.
Monday, March 25, 2013 at 2:02pm

Physics
In Oersted's experiment, suppose that the compass was 0.30 m from the current-carrying wire. If a magnetic field of 1/3 the Earth's magnetic field of 5 10−5 T was required to give a noticeable deflection of the compass needle, what current must the wire have ...
Sunday, March 24, 2013 at 3:02pm

Physics
1. At what height above the earth is the free-fall acceleration 30% of its value at the surface? 2. What is the speed of a satellite orbiting at that height?
Sunday, March 24, 2013 at 11:03am

Tides
What astronomical bodies are most responsible for the tides on earth?
Sunday, March 24, 2013 at 3:01am

Earth and Space Science
which is closer to earth a moon or galaxy?
Saturday, March 23, 2013 at 10:09pm

Earth and Space Science
Put the following astronomical bodies in order from largest to smallest: a. Universe b. Galaxy c. Moon d. Planet e. Solar System f. Comet
Saturday, March 23, 2013 at 9:47pm

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