# Why must the centre of the satellite orbit coincide with the centre of the Earth?

25,380 results, page 68

### Math

Working with simple addition and multiplication of positive and negative numbers. Have completed 59 of 60 problems on a worksheet, I am stumped by one of them. For example Two numbers are given 30 and 13, You must find two number multiplied together equal -30 and when added ...

### Alg2

A video store has 8 new releases this week. Each is available on videotape and on DVD. How many ways can a customer choose a new release and a format to rent? answer here How many ways can six different books be arranged on a shelf if one of the books is a dictionary and it ...

### english

Please don't just give me the answer, because I won't learn that way. I am home schooled, and my parents are at work during the day. 9. Which sentence corrects the following sentence? The final decision must be made by Ellen and he. (1 point) A. The final decision must be made...

### Science Urgent Please help

(I have no idea how to even approach this question. Can anyone please help me?) Some people have proposed that the earth could solve its population problem by shipping people off to space colonies, each containing about 10,000 people. Assuming that we could build such large-...

### physics

i don't understand the projectile motion...my teacher said...it's a motion of a body confined to a vertical plane, perpendicular to Earth's surface... I don't get it, can anyone explain to me clearly???? plzzzzz....THX!!!! If your teacher said that, she was wrong. I doubt if ...

### Quadratic Equations

Describe a sporting situation that has quadratic characteristics. Use key terms such as maximum or minimum, starting or ending points(ordered pairs), shape, vertex, etc. to explain why the situation could be considered to have quadratic characteristics. A complete response ...

### Math

I have no idea, but I guessed 5 pieces won out of 15. Anyhow here is the question. During an art contest at your school, you and a classmate each won blue ribbons for 1/3 of the pieces you entered in the contest. You won 2 blue ribbons and your classmate won 3 blue ribbons. ...

### physics

Airplane flight recorders must be able to survive catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the tests is an impact shock test, in which the box must survive being thrown...

### Physics

Airplane flight recorders must be able to survive catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the tests is an impact shock test, in which the box must survive being thrown...

### Algebra

'L' has y-intercept (0,-3) and is parallel to the line with equation y=2/3x+1. (Instructions - write the equation of the line 'L' satisfying the given geometric conditions) We know that two lines that are parallel must have the same slope. So this line must have the slope (2/3...

### Ela

1:In who knows if the moons what is the moon seen as? A:city B:balloon ****** C:cloud D:sailboat 2:I’m who knows if the moons the speaker imagines traveling somewhere where does he imagine traveling? A:to earth from the moon B:to a nearby garden C:to the moon from the earth ...

### physics

As a moon follows its orbit around a planet, the maximum gravitational force exerted on the moon by the planet exceeds the minimum gravitational force by 9.8%. Find the ratio rmax/rmin, where rmax is the moon's maximum distance from the center of the planet and rmin is the ...

### physics

As a moon follows its orbit around a planet, the maximum gravitational force exerted on the moon by the planet exceeds the minimum gravitational force by 9.8%. Find the ratio rmax/rmin, where rmax is the moon's maximum distance from the center of the planet and rmin is the ...

### Physics

As a moon follows its orbit around a planet, the maximum gravitational force exerted on the moon by the planet exceeds the minimum gravitational force by 47.9%. Find the ratio rmax/rmin, where rmax is the moon's maximum distance from the center of the planet and rmin is the ...

### Physics

As a moon follows its orbit around a planet, the maximum gravitational force exerted on the moon by the planet exceeds the minimum gravitational force by 28.2 %. Find the ratio rmax/rmin, where rmax is the moon's maximum distance from the center of the planet and rmin is the ...

### physics

consider an electron near the equator. in which direction does it tend to deflect by the magnetic field of the earth if its velocity is directed a. downward b.northward c.westward d.woutheastward

### a&p

If an astronaut returned to earth after a 180 day stay in a weightless space station he would have a decrease in bone mass? true or false?

### science

Would you say,as a whole,we who live on the earth,are living sustainable or unstainable lifestyles.Why? Also in what ways might we be wasting our natural capital?

### physics

Suppose partial melting of the polar ice caps increases the moment of inertia of the Earth from 0.331MR^2 to 0.332MR^2. What is the change in length of day in seconds?

### Physics

An astronaut takes a space trip to newly discovered palnet X. measurements from earth indicate that: Mx=3Me and Rx=2Re. What is the acceleration of gracity gx on this planet as a multiple of ge?

### social studies

TRUE OR FALSE:are river valleys, basins, and coastal plains of east asia among the most sparsely populated places on earth?

### physics

in what specific way does light from distant stars and galaxies tell astronomers that atoms throughout the universe have the same properties as those on earth?

### Earth Science

In what ways can sea level be lowered? What effect might this have on existing life forms? I can't find it in my textbook. Can somebody helps??????? THANKS A LOT!!!!!

### Earth/Space Science

What effect, if any, would you expect a massive forest fire to have on the amount of carbon dioxide in the atmosphere? Explain your answer, please?

### Science

19. Which of the following base unit definitions was changed from being based on an arc of the earth to a time interval of light? second kilogram meter candela

### science

How long would it take a radio wave with a frequency of 5.1 × 105 Hz to travel from Mars to Earth if the distance between the two planets is approximately 8.00 × 107 km?

### physics

The average distance separating Earth and the Moon is 384,000 km. A 2.6x104 kg spaceship located halfway between them. (b) What is the total potential energy of the ship?

### science helppp.

4. Small pieces of rock that enter Earth's atmosphere at speeds of 15 to 70 km/s and burn up are called ____. (1 point) stars meteors meteorites asteroids

### 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

### Earth Science

do you think that the earthquake that affected japan should have a impact on the nuclear issues for the united states ? DONT UNDERSTAND THIS QUESTION AT ALL !

### Science

What are reasons you should pick up trash of the ground if the someone leaves it. I have 2, 1. less pollution and 2. keeps earth healthy and clean. I need 2 more

### Technology & Society

According to the text, by 2050, it is believed that __________ of the earth's species will become extinct if rain forest destruction continues. A. 6% B. 14% C. 25% D. 50% I think it's C., but not sure

### Science

True/false Earth's atmosphere oceans and continents began to form during the first several hundred million years of the Precambrian time.

### Earth Science

What two types of air masses collide to form a dry line? On which side of this boundary would you expect to see rising motion, and why?

### Science

one year ago How many Global Positioning System (GPS) satellites are required to pinpoint your location on Earth’s surface? (1 point) 24 12 3 5 i think it's 4, but 4 is not an option

### English

What does Asimov predict will happen to earth in billions of years? a. it will be burned up by the sun b. its population will increase c. it will shrink slightly in size d. it will change position in the galaxy*****

### grade 9

A 40m deep well with radius 3.5m is dug & the earth taken out is evenly spead to from a platform of dimension 28m by 22m.find the heght of the platfoem?

### Algebra

Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets, but did you know that ...

### Science

Which of the following is true about diabetes? A. The pancreas overproduced glucose, and so insulin must be injected to reduce glucose levels. B. The pancreas underproduced glucose, and so insulin must be injected to increase glucose levels C. The pancreas overproduced insulin...

### Silent Night in Cheyenne

For anyone interested in Native American, here is what is sung to the tune of Silent Night. Pavetaa'eva nehe'xoveva Tsexho'ehnese ho'eva, Jesus Vo'estanevestomanehe. Ehvo'estanetsehestaotsehoo'o Tsexho'eotsestomotahaetse Vo'estanevehahtsestotse. Ahaa esheeva nehe'xoveva Tsexho...

### Physics

If a 1.75 m tall man is looking at a plane mirror from an eye which is 15 cm from the top of their head, what is the minimum length that the mirror must be so that he can just barely see his whole body in the mirror? How far up from the ground must the mirror be placed? 1/(...

### physics

As Newton showed, gravity is a force that acts along the line separating two bodies and causes the two bodies to be attracted to each other (i.e. it is a central force). In this problem, assume that the planetary orbits about the Sun are circular. a. Does the force of gravity ...

### Math Algebra

Question:: You are about to take a test that contains questions of type A worth 4 point and of type B worth 7 points. You must andwer at least 5 of type A and 3 of type B, but time restricts answering more than 10 of either type. Intotal, you can answer no more than 18. How ...

### Earth Science

What commonly used metal is extracted from hematite? There are a number or iron ores. Hematite is one of them.

### Physics

The moon orbits 3.84 x 10^8m form the center of the earth. How fast does the moon travel in meters per second?

### science

how is heliocentric(planets and Earth revolve around the sun) connected to science? math? the world? you? and y is it important?

### Chemistry

The circumference of the earth is 25,000 mi at the equator. What is the circumference in kilometers? in meter? -- I really don't understand how to concer this. Please help!

### earth

What are the distinguishing characteristics between the two catagories of igneous rocks? I know two are texture and color. But are there any more?

### Earth Science

Around what tectonic plate are most of the worlds volcanoes located. The Pacific plate. Is this correct?

### greek bases

the greek base in the word chronology means: a.life b.pain c.time d.earth i choose c?

### Earth science

what is the material between 2900 kilometers and 5200 kilometers below earths surface inferred to be

### geometry

radius of 3960 miles cause there 5280 feet find length in feet by circumference of earth use ~3.14

### Science

Explain- how would the gravitational force between Earth and the Moon change if the distance between them increased?

### algebra

earth tothe sun is 93000000 how many of you stacked on top of yourself would it take to reach the sun

### physics

how much work is required to lift a 10 newton weight from 4.0 meters to 40.0 meters above the surface of earth

### physics

A 3.3 kg brick is falling at a rate of 35.1 m/s toward the earth at a current height of 14 m. What is the total mechanical energy of the brick?

### Physics (please help!!!!)

Derive the rocket equation M(dV/dt) = -u(dM/dt)for a rocket in the (constant) gravitational field near the surface of the Earth.

### science

your mass is 90 kilograms. you are on the earth where the acceleration of gravity is measured at 9.8 meters/sec sec. What is your weight in Newton?

### science

Sam weighs 720 N on earth and 120 N on the moon. What does this tell you about the value of gravity on the moon?

### astronomy/physics

Use Newton’s Law of Gravity to calculate the force of gravity between a 39 kg person and Earth.

### earth

Determine the gravitational force that you exert on another person 1.90 m away. Assume that you and the other person are point masses of 75.0 kg each.

### Physics

An object has a mass of 115 kg on the Earth. What is the weight of the object on the surface of a planet where the acceleration due to gravity is 5.6 m/s2?

### physics

how do scientist know that the chemical elements here on earth are the same as on the planets in space and not some different elements

### Physics

What is the frequency of the electromagnetic radiation from outer space that reaches the earth with a wavelength of 1 x 105 m, and a velocity of 1 x 105 m/s?

### phscal sicence

If an astronaut in full gear has a weight of 1150 N on Earth, how much will the astronaut weigh on the Moon?

### Enviro Science

Describe the diversity of species on Earth, relating the difference between known numbers and estimated numbers Thanks -MC

### Marine Biology

Surface currents are created by wind and the Earth's rotation. What creates deep water currents?

### dynamics of rigid bodies

prove that the weight of an object on the moon is approximately one-sixth of its weight on earth

### 6th Grade Science - Help

Which of Earth's spheres has the most mass? 1. atmosphere 2. hydrosphere 3. geosphere 4. biosphere Is it Biosphere?

### Math

On what day in the year 1943 was the earth 300 000 minutes old? (give the month and day)

### math

The Position of two A and B on the earth’s surface are (36°N, 49°E) and (36°N, 131°W ) respectively. (a) The difference in long between town A and town

### physics

If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet, what is the acceleration due to gravity (in m/s2) on that planet?

### Science

How is the temperature of the Earth affected by factors controlling the balance between incoming radiation and radiation emitted...?

### physics 2

A system consists of 4.8 mol of an ideal monatomic gas at 375 K. (a) How much heat must be added to the system to double its internal energy at constant pressure? ? kJ (b) How much heat must be added to the system to double its internal energy at constant volume? ? kJ

### physics

In order to qualify for the finals in a racing event, a race car must achieve an average speed of 276km/h on a track with a total length of 1520m. If a particular car covers the first half of the track at an average speed of 246km/h, what minimum average speed must it have in ...

### Physics

In order to qualify for the finals in a racing event, a race car must achieve an average speed of 230 km/h on a track with a total length of 1810 m. If a particular car covers the first half of the track at an average speed of 245 km/h, what minimum average speed must it have ...

### Chemistry

A student tested the effect of temperature on the decomposition of N2O5. He found that the rate of the reaction at a lower temperature was 4.2 x 10–3 s–1 and the rate at a higher temperature was 1.6 x 101 s–1. What is wrong with the student's data? A. Nothing. Rate ...

### Physics please help

He drops a ninja ball device from a height of 10.0m. The mass of the enter device is 190g and the mass of the top (smallest) ball is 2.90g A) calculate the momentum of the device as it hits the ground (ignore air resistance) I know that this answer is 2.66 for sure B) if the ...

### History

Speaker A: "It is proper for the United States to seize the Philippines before some other country does. We can use both natural resources and the port." Speaker B: "We have saved the Cubans from Spain. It would be dangerous to give them too much freedom; for their own good we ...

### ENGLISH Types of business writing

Assume that you’ve worked for the last five years as an administrative assistant for the Human Resources Department of Broadworth General Hospital. The Director of Human Resources, Miriam Hopkins, has charged you with organizing a two-hour training seminar to be attended by ...

### Chemistry

Can someone help me balance this equation? MnO4(¨C) + H(+) + C2O4(2¨C)--> Mn(2+) + H2O + CO2 Sure but tell us what you don't understand about it. You need to learn how to do them yourself. Tell me what you don't understand, in detail, and I can help you through it. Well I...

### CHEM

in addition to previous Q: for eg: why is the oxidation state (#) of Ca in CaH2 "+2"? According to a p.table I have here +2 is the only oxidation # for Ca...but how is that figured? One other eg: the oxidation state (#) of the maganese atom in KMnO4.6H2O is "+7". How is this ...

### physics

A ship sets out to sail to a point 174 km due north. An unexpected storm blows the ship to a point 132 km due east of its starting point. How far must it now sail to reach its original destination? In what direction must it now sail to reach its original destination?

### physics

An engineer uses a bolt to connect a joint. The force provided by the bolt F is a function of the external load P that it must bear. The bolt applies a force of 200 lb against an external load of 100 lb. The same bolt must apply a force of 400 lb against an external load of ...

### Technology

According to Alan Durning, the basic value of a sustainable society is: A. that any society's consumption levels must be tied to locally available resources. B. each generation should meet its needs without jeopardizing the prospects of future generations to meet their own ...

### Business Communication

You ask for feedback on a proposal and are told "I don't believe your claims. Your facts must be wrong." You are confident that your facts are indeed correct. You should: a. write a memo to the proofreader's supervisor before sending the final proposal b. make your claims more...

### Statistics

The weight of bags of pretzels are normally distributed with a mean of 150 grams and a standard deviation of 5 grams. Bags in the upper 4.5% are too heavy and must be repackaged. Also, the bags in the lower 5% do not meet the minimum weight requirement and must be repackaged. ...

### Enviro Science

4. The Earth's tectonic plates and earthquakes are related because a. most earthquakes take place at or near tectonic boundaries b. during an eruption, the plates slip past one another c. of the measure of energy released by the earthquake, called magnitude d. an earthquake ...

### Math

1. The US Senate is composed of 2 senators from each of the 50 states. For a treaty to be ratified, at least two-thirds of the senators present must approve the treaty. Suppose all senators are present and 48 of them have voted in favor of a treaty. What are the possible ...

### visual basic programming

Write a Visual Basic program that will calculate the assessment marks of a student taking the Computer Programming subject in College. The program must be able to determine the total result and finally display the grade of that student. The program will also ensure that each ...

### Social Studies

My most exalted Monarch - Your Majesty Queen Isabella, I am writing this letter most humbly for you to consider my request for three small ships and a crew so that I may sail west and find the shortest route to the East. I promised to chaim land for Spain and bring back riches...

### chemistry

2. A researcher is often required to prepare solutions in the lab. Typically, a lab provides a concentrated solution. This solution must be diluted to the proper concentration. Hydrochloric acid is a common stock solution that is typically purchased at 37.0% HCl concentration...

### Physics

As a civil engineering intern during one of your summers in college, you are asked to design a curved section of roadway that meets the following conditions: When ice is on the road, and the coefficient of static friction between the road and rubber is 0.077, a car at rest ...

### calculus

A dam 15 m high holds the water in reservoir . For safety reasons , the water level is maintained at a height 3 m below the top of the dam. At best of the dam , engineers have installed a vertical door in the shape of an equilateral triangle with sides of length 3 m , ...

### Inter. Algebra

what is the answer to 2 square root of 18x? Do you mean 2*(18x)1/2? What does it equal. What are we to do with the problem? DrBob222, My problem states 2 square root sign & 18x underneth it. If you could help me with this problem I'd really appreciate it. It must be equal to ...

### physics

I am helping my friend move into his new apartment. During the move, we have to load boxes into the back of his truck. To make it easier to load them, we've set up a metal ramp so that we can slide the boxes up to the deck of the truck. The box shown in the figure has a mass ...

### physics

A stunt driver wants to make his car jump over eight cars parked side by side below a horizontal ramp. (a) With what minimum speed must he drive off the horizontal ramp? The vertical height of the ramp is 1.5m above the cars, and the horizontal distance he must clear is 20m. (...

### 4 questions

I need theses answers with in 24 hours all of them please if you can thanks In “who knows if the moon’s,” what is the moon seen as? A a city B a balloon C a cloud D a sailboat In “who knows if the moon’s,” the speaker imagines traveling somewhere. Where does he ...

### Chemistry

Can u help me in balancing the following eqn. through oxidation no. method or half reaction method. Also please show and explain the steps. HNO3(aq.) + KI(aq.) -----> NO(g) + I2(s)+ H2O(l) + KNO3(aq.) Hoping for a quicker response. I goes from -1 to 0 N goes from +5 to +2 ...