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

25,380 results, page 82

### HVAC

Why must all valves be open when an evacuation is performed?

### gov.

An economic system must provide the answer(s) to what question(s)?

### science

What cellular structures must an angiosperm have to survive?

### calculus

If f and g are two functions for which f' = g and g' = f for all x, then prove that f^2 - g^2 must be a constant.

### Chemistry

How many milliliters of 2.50 M KI must be diluted to make 365 mL of 0.432 M KI?

### proble solving

what must be added to 346 to make 775

### Biology

What three things must be known to perform radiometric dating?

### English

what is the noun fuction of He must like studying calculus.

### science

According to the HIPAA Security Rule, organizations must:

### mathematics

how many terms in the series 18-16-13-....must be added to give a sum of 44?

### statistics

a resturant must choose 5 employees from 12 applicants. in how many ways can they do that?

### math

what fraction must be added to the difference of 5/6 and 2/3 to have an average of 1/4

### Chemistry

If an element has 12 protons and 17 neutrons, how many electrons must it have?

### Geometry

Prove that any altitude of a triangle must be less than the semiperimeter.

### Algebra

What must be added to x^2 + 10x +23 to make it a perfect square?

### Math

What must be added to x^2 + 10x +23 to make it a perfect square?

### Science

How much force must be applied to accelaerate a 40 kg chair at 2.8m/s2?

### Mathematics

What Must Be Added To x^2 + 10x + 23 To Make It A Perfect Square

### Chemistry

How many moles of O2 must react with 0.550 mole ofMethanol?

### Teacher aid

To find the ZPD of given student you must

### Chemistry

Why must not the condensed water drip into the flask?

### math

one third of which number must be subtracted from 7/11 to give 24/25

### chem

what must happen for an element to emit visible light

### english

is there a predicate pronoun in this sentence?You must have strength.

### Math

In how many ways can a commitee of 6 be chosen from 7 couples if 5 must be males.

### Algebra

For which value of x must the expression √97x be further simplified?

### math

joe must choose a number between 49 and 95 that's is multiples of 3,6,7

### Ed Tech

To edit the text in a smartart graphic, what must be done first ?

### Technology

To edit the text in a SmartArt Graphic, what must be done first?

### work maths

How many of shapes must be shaded so that 2/5 of the figure is unshaded

### Astrophysics

I'm having trouble understanding the formulas for determining a planet's distance and mass. A planet's distance is related to the period of revolution and the mass of the central star (e.g, the sun). The relationship is called Kepler's Third law. Distance can also be ...

### Drivers ED

You are driving on a two lane street and you take notice that there is a broken white line between the two lanes. Ahead of you there is a car in the other lane coming toward you. Which is the most likely problem in this situation? A: All traffic should be going the same ...

### calculus

Let f'''(t) = 5 t + 10 \sqrt{t}. (a) Find the most general formula for f''(t). If an arbitrary constant must be used here, use an upper-case "C". f''(t) = (b) Based on your answer to (a), find the most general formula for f'(t). If another new arbitrary constant must be used ...

### History

which of the following Explain the Three-Fifths Compromise and the impact on the political future of the country?] A.)Delegates agreed that three-fifths of the voting members had to be in favor of a law before it was written into constitution B.)Delegates agreed that three out...

### Technology

21. You have learned that there are seven inputs common to all technological systems. List these inputs and give an example for each one. 21. There are seven inputs that are common to all technological systems. These include people, materials, tools (machines), energy, ...

### physics

A 2.5 kg mass weighs 23.75 N on the surface of a planet similar to Earth. The radius of this planet is roughly 7.7 × 10 6 m.Calculate the mass of of this planet. The value of the universal gravitational constant is 6.67259 × 10−11N · m2/kg2

### earth science

Which of the following is a true of passive continental margins A. They generally have a deep trench B. They have a continental rise C. Crust is destroyed at their boundary D. They always have a subduction zone

### physics

A 4 . 7 kg mass weighs 39 . 95 N on the surface of a planet similar to Earth. The radius of this planet is roughly 6 . 2 × 10 6 m. Calculate the mass of of this planet. The value of the universal gravitational constant is 6 . 67259 × 10 − 11 N · m 2 / kg 2 . Answer in...

### Chemistry

1. Before the Industrial Revolution, the concentration of CO2 in Earth’s atmosphere was about 275 ppm. Considering the effect of CO2 only, calculate the effect that the increase in CO2 has had on the pH of precipitation

### Science

Where is most of the surface water on earth found? a) as freshwater in rivers b) as frozen water near the pole c) as groundwater under the surface d) as salt water in oceans I think its either A or D. Am I correct?

### Geometry

Use an indeirect proof to show that John exceeded the 55 MPH speed limit if he left his house at 8:15 a.m. and arrived at his office 60 miles away at 9:00 a.m. Assume temporarily that John traveled at a constant speed of 55 mph and that was his maximum speed. Then in 45 ...

### More Math

There have been about two years before the birth of Christ for every 3 years of history in all. If 4,000 years passed before Christ's birth, what is the total number of years in history? (Years BC)/(Years AD + Years BC) = 2/3 4000 y = (2/3)(Years AD + Years BC) 6000 y = (Years...

### Math

In the SmallState Lottery, three white balls are drawn (at random) from twenty balls numbered 1 through 20, and a blue SuperBall is drawn (at random) from ten balls numbered 21 through 30. When you buy a ticket, you select three numbers from 1-20 and one number from 21-30. To ...

### math

In the SmallState Lottery, three white balls are drawn (at random) from twenty balls numbered 1 through 20, and a blue SuperBall is drawn (at random) from ten balls numbered 21 through 30. When you buy a ticket, you select three numbers from 1-20 and one number from 21-30. To ...

### Math

You're on a skateboard, moving very fast but at a constant speed. Are you accelerating? Explain. Lara Claims that if an object is accelerating, it must be moving. She also claims that if an object is not accelerating, it must be at rest. Is lara correct? Explain. Is a dog ...

### english please help

1. The team __ is wearing the red jerseys is the one I came to see. Which of the following pronouns correctly completes the sentence above? A. who B. whom C. that D. which 2.Which of the following sentences is punctuated correctly? A. A carpenter must use certain tools, ...

### Physics

You are general in the Napoleonic wars. You are on top of a plain 12m talk and you have a cannon that can shoot a cannonball out at 350 m/s. 800 m away is a thick forest that you cannot see into but one of your scouts in a hot air balloon has just signaled to you that an enemy...

### Physics

You are general in the Napoleonic wars. You are on top of a plain 12m talk and you have a cannon that can shoot a cannonball out at 350 m/s. 800 m away is a thick forest that you cannot see into but one of your scouts in a hot air balloon has just signaled to you that an enemy...

### Science

1.)TRUE OR FALSE: Scientific investigations involve testable questions. * True False 2.)Which of the following would not be a reliable place to find research for a scientific investigation? * science journals experts wikipedia textbooks 3.)Why should a scientist reapeat an ...

### I need answer fast

A machine will add 128 parts of water to l part of the kool aid in the machine. If a kool aid must be dispensed in the ratio 1part kool aid and 448 parts of water, how should the mixture be diluted. Please give me the steps to get to answer. You need to add 448-128 = 320 parts...

### Social studies/ Psychology

i have to do a project on the endocrine system it must be a display that is 3d any ideas it must not be store bought such as a model that i purchased i have to make it myself i was thinking of using styrofoam and shaping it into a human outline and making little carvings or ...

### PLZ CHECK ANSWERS

1. A pea plant with yellow seeds is crossed with a pea plant with green seeds. All of the offspring have yellow seeds. the allele for yellow seeds is... A. Dominant because all the offspring have yellow seeds B. recessive because all the offspring have yellow seeds. C. ...

### PLZ CHECK ANSWERS!!!!!!!!!!!!!!!!

1. A pea plant with yellow seeds is crossed with a pea plant with green seeds. All of the offspring have yellow seeds. the allele for yellow seeds is... A. Dominant because all the offspring have yellow seeds B. recessive because all the offspring have yellow seeds. C. ...

### Chem

The space probe Pioneer 11 was launched April 5,1973, and reached Jupiter in December 1974 traveling a distance of 998 million km. How long did it take an electromagnectic signal to travel to earth from Pioneer 11 when it was near Jupiter.

### physics

questoins asked in a physics lesson which i find hard to answer: 1) do all objects have the same acceleration when they fall to earth? explain the answer. 2) what is the difference between weight and mass? any help would be greatly appreciated :)

### Astronomy

Suppose you received a message from aliens living on a planet orbiting a star identical to our Sun. They say they live 4 times farther from tier star than Earth is from the sun. What is the length of their year compare to ours?

### science

the amount of solar energy that is intercepted by the earth is___by the __ of __. a) determind, lenght , daylight b) affected, presence, clouds in the sky c) influenced, phenomena, day and night d) influenced, phenomena, parallelism of axis e) all of the above

### 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?

### PHYSICS HELP! PLEASE!

On the moon, the downward acceleration dur to gravity is only about one-sixth as large as it is on earth. if a 16 kg rock is put on a spring scale on the moon. What would the scale read? Give your answer in newtons.

### Physics

How do you find the ratio of the new/ old world periods of a pendulum if the pendulum wee transported from earth to the moon, where the acceleration due to gravity is 1.63m/s^2? Im not sure if we use 9.8 at all, I think I'm supposed to use T=2 pi sqrtL/g.

### PHYSICS

The magnetic field of the Earth at a certain location is directed vertically downward and has a magnitude of 54.0 µT. A proton is moving horizontally towards the west in this field with a speed of 6.00 ✕ 106 m/s. What is the radius of the circular arc followed by this ...

### PHYSICS

The magnetic field of the Earth at a certain location is directed vertically downward and has a magnitude of 54.0 µT. A proton is moving horizontally towards the west in this field with a speed of 6.00 ✕ 106 m/s What is the radius of the circular arc followed by this ...

### Math, physics

A rotating space station has radius 1380 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?

### Social Studies

According to Aborigine spiritual beliefs, the Earth is a. a place of unending suffering and pain.*** b. a source of wealth to conquer in the name of one's ancestors. c. an ancient gift of the gods. d. a place where humans were banished from the gods.

### math

an agriculture field is rectangular, with dimensions 100m by 42m.a 20 m deep well of diameter 14 m is dug in a corner of the field and the earth taken out is spread evenly over the remaining part of the field.find the increase in the level of the field

### ENGLISH HELP PLS

Identify the choice that best describes the sentence. 5. More than 1,000 years passed before Copernicus proposed that the earth orbited the sun. (1 point) a. simple*** b. compound c. complex d. compound-complex *** = my answer

### pre ap physics

** When s conducting sphere is charged positively, initially the charge is deposited on the left side. However, due to the sphere's conducting nature, the charge spreads uniformly throughout the surface of the sphere. Charge is uniformly distributed because: ** A. charged ...

### Science

1, How does sea-floor spreading occur? A, New materials are being added to the asthenosphere. B, Earthquakes break apart the ocean floor. C, Sediments accumulate at the area of spreading. D, Molten material beneath Earth's crust rises to the surface. •• 2, Which features ...

### 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 ...

### 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 ...

### English

Posted by rfvv on Thursday, December 16, 2010 at 3:40pm. Posted by rfvv on Thursday, December 16, 2010 at 3:21am. {At a restaursant} For hear or to go? Is this for here or to go? It's for here, please. It is to go, please. (Are the expressions above all grammatical? What is ...

### Technology (Correct please)

(1) In what stage does publishing occur? A- first B- second C- third D- final ~~~~~~~~~~~~~~~~~ My answer is D- final ~~~~~~~~~~~~~~~~~ (2) Publishing can include multimedia or multiple communication methods. Some types of multimedia are images, video, and _______. A- Sound B...

### Math

In order to cover upfront expenses, Pinecrest Enterprises must be able to come up with $50 million of its own capital reserves. Presently, Pinecrest has $37 million in capital reserves available, and can add $1.5 million per month . After how many months will Pinecrest ...

### science

How does earth science overlap with life science?

### Earth Science

How does the amount of water vapor in the atmosphere at any one time compare to the total flux of water vapor through the atmosphere each year?

### Earth Science

which geologic era had the shorest time span and the longest time span? 1) Longest = paleozoic 20 shortest = cenozoic Is this correct?

### Physics

Which way does the magnetic vector B point in the vicinity of the Earth's North Pole? A. Upward B Downward C. Horizontally D. THere is no magnetic field at the North Pole

### Earth Science

If an unstable isotope contained 5 protons and 8 neutrons, how many neutrons would need to decay to make the unstable isotope stable? Please Help!

### Science

The sun emits billions of watts of light,heat,and energy ever second. How much of this light,heat, and energy does the Earth benefit from?

### physics

At the surface of a certain planet, the gravitational acceleration has a magnitude of 15.0 . A 28.0- brass ball is transported to this planetWhat is the mass of the brass ball on the Earth and on the planet

### physics

A ball is let fall from a hight h0.There are n collisions with the earth . If the velocity of rebound after n collisions is vn and the ball rises to a hight hn , then coefficient of restitution e is given by ,

### physics

horizontal and vertical component of earth's magnetic field at a place are 0.22 tesla and 0.38 tesla respectively then find the resultant intensity of magnetic field

### chemistry help

ok so i need to find how many atoms make up the earth. the average atomic mass of the atoms is 14g/mol. avogadro's number gives the number of atoms in a mole. so what atom do i take?? carbon or something??

### Physic

Geophysicist have estimated that the temperature at the center of the earth’s core is 5000⁰C (or more), while the temperature of the sun’s core is about 15 million K. Express both of these temperature in Fahrenheit degrees.

### essex county

a robe exert a force on a 20kg crate. the crate starts from rest and accelerates upward at 5m/s^2 near the surface of the earth. how much work was done by the force in raising the crate 4.0m above the floor?

### physics

A baseball pitcher throws a baseball with a speed of 48 m/s . In throwing the baseball, the pitcher accelerates it through a displacement of about 3.5 m, from behind the body to the point where it is released how long was it in the air before returning to earth?

### physics

a boat heads directly across a river with a speed through the water 8m/s. the river current is 2m/s a. what is the magnitude and direction of the boat velocity relative to the earth? b.when the boat reaches the other bank, how far will it be?

### Math

My neighbor hired me to plant 10 trees. However, he wants 5 rows of 4. How am I going to do this just using 10 trees? you cant you need 20 trees or just do 2 rows of 5 is this is an actual math question and not a real life question then the answer is impossible or unsolveable ...

### science

If the earth's axis was tilted at 30 degrees instead of 23 1/2 degrees, how would that effect the seasons, or lengths of days, winds, etc. Or, would it have any effect at all?

### science

i have a question and i have no answer to it..... How does atmosphetic pressure change as you move away from the surface of Earth. i think the answer is gravity, I THINK NOT S.U.R.E. OF IT...................................................... thank uuuuuuuuuuuuuuuuuuuuuuuuuuuu

### 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?

### Science

Historical models of the solar system include: A.Helliocentric,B.nebular,C.Geocentric model or earth centered universe and a _ model or sun centered universe

### Calculus

So I have a math problem that says that a free-falling body near the surface of the earth accelerates downward at a constant of 32 ft/sec^2. so for the graph a(t) it would just be a straight line across 32 no matter what time, or in other words a(t)=32. since v'(t)=a(t) ...

### earth

#33 When conducting an experiment that deals with boiling chemicals, which of the following pieces of equipment would be most important to protect you from being injured? a. fire blanket b. eye wash c. tongs d. goggles I cant decide between c and d because your eyes do need to...

### 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. ...

### 4th grade

bertrand is building in the form of a rectangle. he knows that the garden will be 10 feet wide. he wants to fence in the garden but only has 56 feet of fence to work with. how long mist the garden be to fence it with exactly 56 feet of fence? show how you found your answer. in...

### earth science

24. emormous masses of ____ rock all over the world, such as the Columbia Plateau in the northwestern U.S., give evidence of some huge catastrophic action. granite mountainous sedimentary volcanic volcanic right? Yup.... absolutely

### sicence

Select all of the answers that apply. A map _____. 1)is a representation of the earth's surface 2)is a portable document describing an area 3)can provide data such as migration trends, directions, and rock composition 4)provides all of the information about a location

### sicence

Select all of the answers that apply. A map _____. 1)is a representation of the earth's surface 2)is a portable document describing an area 3)can provide data such as migration trends, directions, and rock composition 4)provides all of the information about a location