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August 23, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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Physics
The Moon causes tides because the gravitational force it exerts differs between the side of the Earth nearest the Moon and that farthest from the Moon. Find the difference in the accelerations toward the Moon of objects on the nearest and farthest sides of the Earth. (The mass...
Tuesday, June 26, 2012 at 6:02pm

Physics
Suppose a new extrasolar planet is discovered. Its mass is double the mass of the Earth, but it has the same density and spherical shape as the Earth. How would the weight of an object at the new planet's surface differ from its weight on Earth? (Let Wnew be the weight of ...
Tuesday, June 26, 2012 at 5:50pm

WSU PHY
The Moon causes tides because the gravitational force it exerts differs between the side of the Earth nearest the Moon and that farthest from the Moon. Find the difference in the accelerations toward the Moon of objects on the nearest and farthest sides of the Earth. (The mass...
Tuesday, June 26, 2012 at 1:51pm

PHSC
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?
Tuesday, June 26, 2012 at 11:33am

Physics
The Moon orbits the Earth at a distance of 3.85 x 108 m. Assume that this distance is between the centers of the Earth and the Moon and that the mass of the Earth is 5.98 x 1024 kg. Find the period for the Moon's motion around the Earth. Express the answer in days. The ...
Monday, June 25, 2012 at 10:03am

physics
The radius of the moon is one fourth and its mass is one eighty first that of the earth. If the acceleration due to gravity on the earth's surface is 9.8meter per square. What is its value on the moon's surface?
Sunday, June 24, 2012 at 5:03pm

Physics
An object is released from rest at height h above the surface of the Earth, where h is much smaller than the radius of the Earth. It takes t seconds to fall to the ground. At what height should this object be released from rest in order to take 2t seconds to fall to the ground...
Saturday, June 23, 2012 at 9:41am

Physics check my answer please
The atmosphere on Mars is almost all carbon dioxide (CO2), and has a pressure of about 6.9×102 Pa, much less than that of Earth. At −22°C (a warm day on Mars), what is the mass of one cubic meter of the atmosphere? (Assume the atmosphere is completely CO2.) I ...
Friday, June 22, 2012 at 11:11am

maths
the radius of our plant earth is about 6400 km how far is it around the equator
Wednesday, June 20, 2012 at 9:37pm

Physics(Please respond)
A satellite has a mass of kg orbits the Earth in a circular path with radius 1.0e^7m. What is the period of the satellite? I think I already posted this but I am still confused. My teacher said to use T= 2(pi)r^3/2 / sqrt GmE So I just plugged the numbers in T= 2(pi)(1.oe^7)^3...
Wednesday, June 20, 2012 at 7:55pm

Physics(Please help)
A satellite of mass 500kg orbits the Earth in a circular path with radius 1.0e^7 m . 1) What is the period of the satellite? I know that the equation is T= 2(pi)r^3/2 / sqrt GmE mE = 5.98e^24 does G = 6.67e^-11 ??
Wednesday, June 20, 2012 at 11:42am

earth
please give me some important tips about a topic 'tiger in trouble'. I have to prepare a chart on this.
Wednesday, June 20, 2012 at 4:47am

physics
Two Earth satellites, A and B, each of mass m = 960 kg, are launched into circular orbits around the Earth's center. Satellite A orbits at an altitude of 4500 km, and satellite B orbits at an altitude of 13600 km. a) What are the potential energies of the two satellites? b...
Monday, June 18, 2012 at 7:42pm

physics
Jupiter's gravitational field at the surface is approximately three times that of the earth. A person weighing 120 lb. on the earth's surface would weigh how much on Jupiter?
Sunday, June 17, 2012 at 7:32pm

physics
an object weighs 3 lb. at 10 earth radii from its center. What is the object's weight on the earth's surface?
Sunday, June 17, 2012 at 5:47pm

physics
what is the weight of a 3.0 kg object on the surface of the earth?
Sunday, June 17, 2012 at 5:46pm

Physics
How much energy is required to move a 900 kg object from the Earth's surface to an altitude twice the Earth's radius?
Sunday, June 17, 2012 at 3:13pm

Physics
How much energy is required to move a 900 kg object from the Earth's surface to an altitude twice the Earth's radius?
Sunday, June 17, 2012 at 3:06pm

Physics Gravity
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, June 16, 2012 at 5:32pm

Physics Gravity
The earth has a mass = 5.98 X 10^24 kg and the sun has a mass = 1.99 X 10^30 kg. They are separated, center to center, by r= 93 million miles = 150 million km. What is the size of the gravitational force acting on the earth due to the sun? Very confused by this problem. May ...
Saturday, June 16, 2012 at 5:26pm

Physics
Assuming that the Earth is spherical and recalling that latitudes range from 0° at the Equator to 90° N at the North Pole, how far apart, measured on the Earth's surface, are Copenhagen (55.67° N latitude), and Rome (41.90° N latitude)? The two cities lie ...
Friday, June 15, 2012 at 9:23pm

Physics
What is the centripetal acceleration of the Moon? The period of the Moon's orbit about the Earth is 27.3 days, measured with respect to the fixed stars. The radius of the Moon's orbit is RM = 3.85 · 108 m.
Thursday, June 14, 2012 at 11:04pm

Physics
Calculate the force of the Earths gravity on a spacecraft 12,800 km (2 earth radii) above the Earths surface if its mass is 1350 kg?
Thursday, June 14, 2012 at 5:34pm

Math
A plumber'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. He moves the same amount to fill the trench. What is his pay for this job? $___________ (These questions are all confusing)
Thursday, June 14, 2012 at 5:15pm

Earth Science
Scientists tell us that the Earth is suffering ill effects from ozone depletion and the greenhouse effect. Compare these two phenomenons. What aspects do they have in common? How might they actually help eah other to produce conditions in which humans and plants would find it ...
Thursday, June 14, 2012 at 12:02pm

Grammar
Do i need to capitalize the word everlasting? ------> The everlasting God, the Lord, the Creator of the ends of the earth, fainteth not, neither is weary. WHY and Do i need to capitalize the word everlasting? Please help.
Wednesday, June 13, 2012 at 9:27pm

algebra
If a pine cone is projected upward at a velocity of 16ft/sec from the top of a 96-foot pine tree, then how long does it take to reach the earth?
Wednesday, June 13, 2012 at 9:48am

Earth Science
How old is the Gneiss in Greenland?
Tuesday, June 12, 2012 at 10:28pm

physics....
1) Yellow light that has a wavelength of 560 nm passes through two narrow slits that are 0.300 mm apart. An interference pattern is produced on a screen 160 cm distant. What is the location of the first-order maximum? 2) A communication satellite is orbiting 36 000 km above ...
Tuesday, June 12, 2012 at 8:54pm

Earth Science
Which of the following processes helps to shape the landforms of Earth? - Mass movement - Glaciers - Wind - All of the above
Tuesday, June 12, 2012 at 6:53pm

Physics
Find the magnitude of the gravitational attraction force that the earth exerts on a 62-kilogram astronaut who is 8.00 X 10^7 meters away from the center of the earth. Useful numbers: M^earth=5.98 X 10^24kg; G=6.67 X 10^-11 N*m^2kg^-2 Please walk me through your steps, don'...
Monday, June 11, 2012 at 2:53pm

Physics please help
Geosynchronous satellites orbit the Earth at an altitude of about 3.58×10^7 m. Given that the Earth's radius is 6.38×10^6 m and its mass is 5.97×10^24 kg, what is the magnitude of the gravitational acceleration at the altitude of one of these satellites? ...
Saturday, June 9, 2012 at 12:49pm

Chemistry
A cublic meter of ocean water contains 6x10^-5 g of gold. If the total mass of the water in Earth's oceans is 4x10^20 kg, how many kilograms of gold are distributed throughout the ocean? (Assume that the density of seawater is 1 g/cm3.) How many literes of seawater would ...
Tuesday, June 5, 2012 at 2:49am

Physics
How far is the center of mass of the Earth-Moon system from the center of the Earth? The Earth's mass is 5.97×1024 kg, the Moon's mass is 7.4×1022 kg, and the distance between their centers is 3.8×108 m.
Monday, June 4, 2012 at 12:57pm

English
i not get what this poem mean it be a ballad but i not get what theme be do the guy girl be in strong bond? True Thomas lay on Huntlie bank; A marvel he did see And there he saw a ladye bright Come riding down by the Eildon Tree. Her skirt was o' the grass-green silk, Her ...
Sunday, June 3, 2012 at 10:32pm

Physics
A rotating space station has radius 1270 m, measured from the center of rotation to the outer deck where the crew lives. What should the period of rotation be if the crew is to feel that they weigh one-half their Earth weight? I got 101.1 seconds... is this correct? Please help!
Sunday, June 3, 2012 at 11:06am

islam
In the Quran the sky is referred to as-sama’,as-samawat & as-sama ad-dunya. a.What is the best definition of the three terms mentioned that is given by mufassirs b.What is their relationship between each other? c.What would each of the term refer to, in our present ...
Friday, June 1, 2012 at 6:33am

Early Childhood Education
The correct definition of the term aesthetics is A.sensing and gaining beauty and wonder from the environment. B. looking at the earth with a utilitarian purpose in mind. I think it's A. Please help
Thursday, May 31, 2012 at 5:58pm

Physics
Calculate the force on an electron (qe = -1.6 x 10^-19 C) in each of the following situations: a.) moving at 2.0% the speed of light and perpendicular to a 3.0 T magnetic field b.) 3.0 x 10^-6 m from a proton c.) in Earth's gravitational field at the surface of Earth
Thursday, May 31, 2012 at 1:39pm

Physics
Calculate the force on an electron (qe = -1.6 x 10-19 C) in each of the following situations: a.) moving at 2.0% the speed of light and perpendicular to a 3.0 T magnetic field b.) 3.0 x 10-6 m from a proton c.) in Earth's gravitational field at the surface of Earth
Thursday, May 31, 2012 at 1:38pm

earth
A particle weighs 120 N on the surface of the earth. At what height above the earth's surface will its weight be 30 N? Radius of the earth = 6,400 km.
Thursday, May 31, 2012 at 11:31am

Earth Science
Environmental Sustainability” refers to the ______________ of vital human ______________ support systems. fill in the blank
Wednesday, May 30, 2012 at 1:31pm

physics
What is the radius of a communications satellite’s orbital path that is in a uniform circular orbit around Earth and has a period of exactly 24.0 hours (86,400 seconds). (Measurement is from the center of Earth.) G = 6.67 × 10-11 N.m2/kg2 ME = 5.98 × 1024 kg 1...
Wednesday, May 30, 2012 at 10:39am

PHYSICS
A straight 1.2 m length iron rod is moved at 10 m/s through the earth's magnetic field at a location where it has magnitude 1.0 × 105 T. What is the magnitude of the induced emf between one end of the wire and the other end? What formula do I use?
Sunday, May 27, 2012 at 4:10pm

Physics
1.(a) Explain the term time dilation. (b) Show that an interval of time observed in a moving frame of reference will be less than the same interval of the observed in a stationary frame of reference. 2. A rocket was found to be 150m when measured on earth. It then leaves and ...
Saturday, May 26, 2012 at 7:15am

Physics
1.(a) Explain the term time dilation. (b) Show that an interval of time observed in a moving frame of reference will be less than the same interval of the observed in a stationary frame of reference. 2. A rocket was found to be 150m when measured on earth. It then leaves and ...
Saturday, May 26, 2012 at 7:13am

CUC
1. A rocket was found to be 150m when measured on earth.It then leaves and move at a constant velocity of 2 x 10m/s. What is its new length? 2. Two spaceships A and B are moving in opposite directions, A with a speed of 0.9c while B with a speed of 6c. Find the relative ...
Saturday, May 26, 2012 at 5:42am

physics please help
An astronaut stands at a position on the Moon such that Earth is directly overhead and releases a Moon rock that was in her hand. (c) What is the gravitational force exerted by the Earth on the same 2.7-kg rock resting on the surface of the Moon? answer in mN I keep ...
Friday, May 25, 2012 at 4:38pm

Earth Science
If you started with 100 grams of Potassium-40 how much would reamin Potassium-40 after 3.9 x 10 to the 9th years?
Friday, May 25, 2012 at 3:13pm

Science
Suppose we allowed each person 1000m^3 of living space in a large building, with ceiling height 3 m. To the nearest order of magnitude, how many 1000m high buildings would have to be built to house the entire population of 8.5 x 10^14 people on the energy-limited Earth, if ...
Friday, May 25, 2012 at 11:31am

geometry
Earth has a diameter of approximately 8000 miles. Jupiter's diameter is approximately 88000 miles. How many times greater is the volume of Jupiter than the volume of Earth?
Wednesday, May 23, 2012 at 4:00pm

physics mc question!!!!HELP
Question # 1 : It a particle increases its speed by a factor of 2, what happens to the kinetic energy? a)doubles b)cuts in half c)increases by a factor of 4 d)depends on whether or not work is done on the particle Question # 2: An object falling near the surface of the Earth a...
Tuesday, May 22, 2012 at 8:01pm

Science
A man has a mass of 66kg in the Earth. What is his weight?
Tuesday, May 22, 2012 at 7:51pm

Marine Biology
Surface currents are created by wind and the Earth's rotation. What creates deep water currents?
Tuesday, May 22, 2012 at 9:35am

Business math
A plumber'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. He moves the same amount to fill the trench. What is his pay for this job?
Tuesday, May 22, 2012 at 6:32am

Physics
A truck travels 2.85 km north and then makes a 90° left turn and drives another 4.90 km. The whole trip takes 4.50 min. (a) With respect to a two-dimensional coordinate system on the surface of Earth such that the y-axis points north, what is the net displacement vector of...
Monday, May 21, 2012 at 2:26pm

Physics
When the space shuttle (mass of the shuttle = 2 x10^6 kg) was at the outer limit of Earth's atmosphere (distance = 350 km above Earth's surface), astronauts measured the gravitational force from Earth to be equal to 1.7 x 10^7 newtons. Assuming that both Earth and the ...
Sunday, May 20, 2012 at 4:29pm

kw university
You want to get an idea of the magnitude of magnetic fields produced by overhead power lines. You estimate that a transmission wire is about 11 above the ground. The local power company tells you that the line operates at 16 and provide a maximum of 83 to the local area. ...
Sunday, May 20, 2012 at 1:53pm

Art
Could you please check these sentences, too? Thank you very much. 1) The Waste Land is a complex long poem of 433 lines about a “waste land” which seems both personal and external. It is divided into five sections and is dedicated to Eliot’s friend and poet, ...
Sunday, May 20, 2012 at 1:20pm

math
The Earth rotates once every 24 hours. What is the angular speed of a point on the Earth's surface in rad/min. Give your answer to five decimal places. Use 3.14 for pi. (example units: m/s, mi/h)
Saturday, May 19, 2012 at 8:40pm

physics
i will begreatfull if u help me insolving the below problems: 1.)the time period of a pendulum clock on the surface of the earth is 6 sec.Find the timeperiod of the same pendulum on the moon.(g=9.8m/sec2) 2.)the time period of a pendulum is 6.28sec.Whay will be its lengthif g=...
Thursday, May 17, 2012 at 10:13am

Momentum
A 8.4 kg laundry bag is dropped from rest at an initial height of 7.00 m. (a) What is the speed of Earth toward the bag just before the bag hits the ground? Use the value 5.98 1024 kg as the mass of Earth. (b) Use your answer to part (a) to justify disregarding the motion of ...
Wednesday, May 16, 2012 at 6:49pm

physics college
Use Newton's Law of Gravitation to compute the work W required to propel a 1100 kg satellite out of the earth's gravitational field. You may assume that the earth's mass is 5.981024 kg and is concentrated at its center. Take the radius of the earth to be 6.37106 m ...
Wednesday, May 16, 2012 at 4:38pm

Enviro Science
4. Which of the following issues hinders efforts to achieve sustainability? a. who will solve environmental problems b. who is responsible for environmental problems c. who pays the costs of implementing solutions d. all of the above D 8. Which of the following factors does ...
Wednesday, May 16, 2012 at 1:19pm

Enviro Science
4. Which of the following issues hinders efforts to achieve sustainability? a. who will solve environmental problems b. who is responsible for environmental problems c. who pays the costs of implementing solutions d. all of the above D 8. Which of the following factors does ...
Tuesday, May 15, 2012 at 8:29pm

Phizzics....
The Canadian microsatellite MOST (Microvariability and Oscillations of Stars) has a mass of just 52 kg. It travels in an almost circular orbit at an average altitude of 820 km above Earth’s surface. a) Calculate the gravitational force between Earth and the MOST satellite...
Tuesday, May 15, 2012 at 7:29pm

Phizzics....
How does the weight of a Mars lander change as it travels from Earth to Mars? Does the weight ever equal zero? Does the mass of the lander change? Explain your answer. (Hint: restrict your analysis to a system consisting of Earth, Mars and lander.)
Tuesday, May 15, 2012 at 7:25pm

PHYSICS
What major obstacle did Henry Cavendish face when measuring the gravitational force between two objects on Earth? A) The masses required had to be very small. B) The gravitational force between the two masses was very small. C) The distance between the two masses had to be ...
Tuesday, May 15, 2012 at 6:48pm

physics
Which of the following best describes the strength of the gravitational force on Earth due to your mass? A) It is zero as long as you are standing on Earth’s surface. B) It is much greater than Earth’s gravitational force on you because Earth’s mass is so great...
Tuesday, May 15, 2012 at 6:46pm

earth science
A different side of the moon faces the earth at different times of the month. True or false?
Tuesday, May 15, 2012 at 11:05am

Health
At the dining halls I work out all employees must wear hats or hairnets and gloves at all times no exceptions! At all the restaurants I have ever eaten at I have never seen waiters or waitresses wear gloves or hairnets/hats ever! I feel as if this a huge sanitation violation ...
Saturday, May 12, 2012 at 11:20pm

solid geometry...
find the area of the earth's surface within the Arctic Circle; that is, in latitude north 66° 32' N. thank you! :D
Saturday, May 12, 2012 at 5:05am

physics
A 20.0-kg model plane flies horizontally at a constant speed of 12.2 m/s. (a) Calculate its kinetic energy. . J (b) The plane goes into a dive and levels off 20.0 m closer to Earth. How much potential energy does it lose during the dive? Assume no additional drag. J (c) How ...
Friday, May 11, 2012 at 8:08pm

gEoMeTrY iNsCrIbEd AnGlEs MuLtIpLe ChOiCe QuEsTiOn
A satellite, B, is 17,000 miles from the horizon of Earth. Earth’s radius is about 4,000 miles. Find the approximate distance the satellite is from the Earth’s surface. {The picture is a circle with point O in the center, point C is on the top center edge of the ...
Friday, May 11, 2012 at 9:38am

inscribed angles
A satellite, B is 17,000 miles from the horizon of Earth, Earth's radius is about 4,000 miles. Find the approximate distance the satellite is from the Earths surface. possilbe answers 13,464 17,464 20,957 21,000 I do not understand how to do these problems
Thursday, May 10, 2012 at 9:13am

physics
What is the change in gravitational potential energy of a 6200 kg satellite that lifts off from Earth's surface into a circular orbit of altitude 2500 km? What percent error is introduced by assuming a constant value of g and calculating the change in gravitational ...
Wednesday, May 9, 2012 at 8:19pm

physics
If the Sun shrank to the size of a black hole without losing any mass, what would happen to Earth's orbit?
Wednesday, May 9, 2012 at 8:15pm

physics
A rocket is launched vertically from Earth's surface with a velocity of 3.4 km/s. How high does it go: From Earth's centre? From Earth's surface? how can this be done without any time or force mentioned ??
Wednesday, May 9, 2012 at 8:14pm

Earth Science
How long will it take for Potassium to have a 25% of oringinal radioactive product left?
Wednesday, May 9, 2012 at 9:35am

Physics Help
If we witness events taking place on the moon, where gravitation is weaker than on Earth, would we expect to see a gravitational red shift or a gravitational blue shift? and Explain please a)blue shift b)red shift c)no shift
Wednesday, May 9, 2012 at 1:29am

Math
When the moon is at its zenith at a point A on earth, it is observed to be at the horizon from point B. Points A and B are 6155 mi apart and the radius of the earth is 3960mi. Estimate the distance of the moon. Thanks!
Tuesday, May 8, 2012 at 8:18pm

physics
if the earth exerts a force 300n how much does the body weigh?
Monday, May 7, 2012 at 5:57pm

Physics Help please
If we witness events taking place on the moon, where gravitation is weaker than on Earth, would we expect to see a gravitational red shift or a gravitational blue shift? and Explain please a)blue shift b)red shift c)no shift
Monday, May 7, 2012 at 11:33am

Physics
Gravity on the moon is only 1/6 as strong as gravity on the Earth. What is the weight of a 55.3 kg dune buggy on the moon?
Thursday, May 3, 2012 at 9:19pm

Intermediate Algebra
Create a list of six questions on solving equations with absolute value symbols that I will try to research, address, discuss, and/or express? Example: Google Earth: The Google Earth image shows the western side of The Mall in Washington D.C. The distance between the Lincoln ...
Thursday, May 3, 2012 at 4:33pm

Earth & Space Science
Could someone please tell me what do you do in this class. I'm going to be a senior next year [High School] , & thinking of taking this class. And also if someone could tell me where to find notes for that class. THANK YOU!
Wednesday, May 2, 2012 at 9:43pm

Physics
If astronauts could travel at v=0.89c, we on Earth would say it takes (4.20/0.890)=4.72 years to reach Alpha Centauri, 4.20 light years away. The astronaut would disagree. (a) How much time passes on the astronaut's clocks? (b) What is the distance to Alpha Centauri ...
Wednesday, May 2, 2012 at 8:33pm

Physics
In its own frame the average pi meson lives 2.60 x 10^-8s. Suppose it moves at 0.985c relative to the Earth. According to us, on Earth, what is a pi meson's average lifetime? (b) according to us, what is the pi meson;s average travel distance before decaying? (c) If time ...
Wednesday, May 2, 2012 at 8:31pm

Physics
A deep space probe moves away from the earth with a speed of 0.75c. An antenna on the probe requires 3.00s probe time to rotate through 1 revolution. How much time is required for 1.00 rev according to an observer on Earth?
Wednesday, May 2, 2012 at 8:25pm

Physics
Two stars are 8 light years from earth (a light year is the distance light travels in one year). The 550 nm light from the two stars can be barely distinguished in the diffraction pattern of 90 cm wide single slit. How far apart are the stars?
Wednesday, May 2, 2012 at 8:24pm

physics
the magnitude of earths magnetic field at the magnetic north pole is 61/1000000.(a) determine the magnitude of the dipole moment of the earth (b)suppose an additional field due to the current in wire around the equator is used to make the net field at the pole zero,what is the...
Tuesday, May 1, 2012 at 12:59pm

earth
About how fast will it be traveling on average? Assume that its trajectory is close to a straight line. Give your answer in {\rm AU/yr} and in {\rm km/hr}.
Tuesday, May 1, 2012 at 3:03am

Physics
At a certain distance from the center of the Earth, a 4.00-kg object has a weight of 1.95 N. Calculate this distance.
Monday, April 30, 2012 at 9:50am

Enviro Science
2. The water resources of Earth are located in a. salt water found in the ocean b. freshwater found in icecaps and glaciers c. fresh water found in rivers, lakes, and streams d. all of the above C 4. Weather is the state of the atmosphere at a moment in time and at any ...
Sunday, April 29, 2012 at 8:45pm

Physics
If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's surface is it when its speed is three-fifths the escape speed? I keep getting the answer 2.56x10^6 m after solving it a few different ways. Help would be great.
Saturday, April 28, 2012 at 6:24pm

trig-math
4. A carpenter wants to be sure that the corner of a building is square and measures 6.0 ft and 8.0 ft along the sides. How long should the diagonal be? A. 12 ft B. 10 ft C. 11 ft D. 14 ft 5. A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far above the base of ...
Saturday, April 28, 2012 at 4:32pm

math-TRIG
1. Which angle measure is consistent with all of the following criteria? (i) The reference angle is 40°. (ii) The angle is more than one revolution. (iii) The angle's terminal side is in Quadrant II. (iv) The angle isn't positive. A. –580° B. –500°...
Saturday, April 28, 2012 at 1:46pm

physics
If a projectile is launched vertically from the Earth with a speed equal to the escape speed, how far from the Earth's center is it when its speed is 1/9 of the escape speed?
Saturday, April 28, 2012 at 12:35am

physics
On July 15, 2004, NASA launched the Aura spacecraft to study the earth's climate and atmosphere. This satellite was injected into an orbit 705 {\rm km} above the earth's surface, and we shall assume a circular orbit. How many hours does it take this satellite to make ...
Friday, April 27, 2012 at 5:47pm

Earth Science
According to the condensation theory, the most important factor for the formation of our planets was _____.
Thursday, April 26, 2012 at 4:41pm

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