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

25,161 results, page 64

### Physics

Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.80 1011 m apart. The larger of the two stars has a mass of 3.50 1030 kg, and its center is 3.00 1011 m from the system's center of mass. What is the mass of the smaller star?

### Physics

Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.40 1011 m apart. The larger of the two stars has a mass of 3.40 1030 kg, and its center is 2.50 1011 m from the system's center of mass. What is the mass of the smaller star?

### Plz help me..just one MATH question

The number 1 is both the square of an integer and the cube of an integer. What is the next larger interger which is both a square and a cube of a positve integer. plz help, the only number i can think of was 0 but its smaller than one. what is the erroron the verdfind it and ...

### Economics

How does scarcity affect producers? A.) Limited costs prevent producers from hiking prices. * B.) Limited demand prevents producers from offering low prices. C.) Limited time prevents producers from finding the best employees. D.) Limited resources prevent producers from ...

### algebra

y= -x^2-12x+28 A painter can use the formula A=2/3bh to estimate the area of space under the parabola. Calculate area in square ft under each arch ~ if there are 8 arches to be painted how many square ft must be painted ~ if 1 gallon paints 200 square ft , how many gallons ...

### english

Treat the Earth and all that dwell thereon with respect. Remain close to the Great Spirit. Show great respect for your fellow beings. Work together for the benefit of all Mankind. Give assistance and kindness wherever needed. Do what you know to be right. Look after the well ...

### Physics Classical Mechanics

Consider a double star system under the influence of the gravitational force between the stars. Star 1 has mass m1 = 2.32 × 10^31 kg and Star 2 has mass m2 = 1.76 × 10^31 kg. Assume that each star undergoes uniform circular motion about the center of mass of the system (cm...

### grade 8 pre-algebra

Grace earns 7 dollars for each car she washes. She always saves 25 dollars of her weekly earnings. This week, she wants to have at least 65 dollars in spending money. How many cars must she wash? Write and solve an inequality to represent this situation. Interpret the solution...

### algebra 2

A chauffer must decide between driving his clients in the rolls royce or the mercedes benz. the rolls royce costs 1.75 per mile to operate and the mercedes benz costs 2.00 per mile. The chauffer can charge 4.00 per mile for the rolls royce and 6.50 per mile for mercedes benz. ...

### English

Choose the one word or phrase that best completes the sentence. 1.In some countries environmental organizations have been _____to inform peole and gain their support a.set off b.make up c.set down d.set out e.set up 2.All questions must be answered ____and you must sign at the...

### physics

plzz help me with my homework!!! Tarzan, played by Patrick Huard, 60 kg, must cross a stream 5 m wide, and full of hungry crocodiles. To do this, decides to slide along a sloping tree trunk, hollowed and moist so that there is no friction. After the trunk, there is a part of 3...

### PHYSICS

A particle with a mass of 2.00x10-16 kg and a charge of 22.0 nC starts from rest, is accelerated by a strong electric field, and is fired from a small source inside a region of uniform constant magnetic field 0.660 T. The velocity of the particle is perpendicular to the field...

### english

Which sentence from this excerpt of Jefferson Davis’s Inaugural Address indicates that secession was the Confederacy’s way of reclaiming its legal powers? A. An agricultural people, whose chief interest is the export of a commodity required in every manufacturing country, ...

### Teachers aide

music or words for four children's songs 2 must be from other cultures.must write song title, the name of the person who wrote it, the publisher's name and city and the copyright date. title: words by: music by: publisher,city,country: copyright date: please help!!!

### Math

7. The ratio of an object's weight on Earth to its weight on Neptune is 5 : 7. How much would a person who weighs 150 pounds on Earth weigh on Neptune? A. 170 pounds B. 107 1/7 pounds C. 750 pounds D. 210 pounds I answered D, because I took 150 pounds and divided that by 5 ...

### English

Compose a sentence that contains a minimum of twenty-one words and a maximum of thirty words.The required main verb of the sentence must be the present progressive verb are planning.You must include the following phrase as a part of the subject:the Puerto Vallarta Inn,an ...

### Algebra.

At the local ballpark, the team charges $5.00 for each ticket and expects to make $1,300.00 in concessions. the team must pay in players $1,800.00 and pay all the workers $1,500.00. Each fan gets a free bat, costs the team $3.00 per bat of the following, what is the smallest ...

### college physics

Superman must stop a 190-km/h train in 180m to keep it from hitting a stalled car on the tracks. part a)If the train's mass is 3.8×10^5kg , how much force must he exert (find the magnitude)? part b)Compare to the weight of the train (give as %). partc) How much force(in ...

### algebra can somecheck my answers

please check my answer thank you Write the phrase “the quotient of 3 more than a number, and 3 less than that same number. “ (x+3/(x-3) . It is estimated that the Earth is losing 4000 species of plants and animals every year. If S represents the number of species living ...

### Science

2. Which of the following describes a relationship between science and society? A: Scientific discoveries can impact human life; therefore, society must remain scientifically literate. B: Scientific discoveries rarely impact human life; therefore, it is not necessary for ...

### Planets

Jupiter, Saturn, Uranus, and Neptune: what is one reason why life probably does not exist on these four planets? A) They have no gravity. B) They are the gas planets. C) They are the giant planets. **** D) They are the rocky planets. Earth seems to be the only planet in our ...

### CHEM (DrBob222)

I had posted the question to that previous chem question, regarding Mo & V...they said that it should have been correct. What I am thinking that I was missing...must have been that I did not include 4s & then just not fill it. I had excluded it from my electron filling ...

### Physics

a place kicker must kick a football from a Lint 36 meters from the goal. As a result of the kick, the ball must clear the crossbar, which is 3.04 meters high. When kicked, the ball leaves the ground with a speed of 20 meters per second at an angle of 50 degrees to the ...

### math

An interior decorator must mix red and white paint in the ratio of 2:5 in order to obtain the correct colour pink. If she needs 28 litres of pink paint, calculate how much red paint and how much white paint shem must use to obtain the right colour.

### Mrs.Sue please help!!!

It says in my competency goal 1 to establish and maintain a safe,healy learning environment. This is what i put. To provide a safe enviroment for infants you must make sure there are no small toys that the kids can choke on. You also need to make sure that the toys that have ...

### physics (please help elena)

Three planets interact with one another through their mutual gravitational forces only; they are isolated in free space and do not interact with any other bodies. They orbit around an axis going through the center-of-mass of the system and perpendicular to the triangle formed ...

### Physics...

A burn produced by live steam at 100oC is more severethan one produced by the same amount of water at 100oC.Verify this, calculate the heat that must be removed from 5.0 g ofwater at 100oC to lower its temperature to34oC.. Then calculate the heat that must beremoved from 5.0g ...

### Math

A manufacturer of soft-drinks advertises that their orange soda as "naturally flavored," although it contains only 5% orange juice. A new federal regulation stipulates that to be called "natural" a drink must contain at least 10% fruit juice. How much pure orange juice must ...

### Astronomy

Given that the mass of the Milky Way galaxy is 10^11 times that of the Sun and that the sun is 2.6x10^20 meters from its center, what is the Sun's orbital speed around the center of the galaxy? How long does it take the Sun to orbit the Milky Way? (In this problem, we assume ...

### 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° C. –220° D. 500° ...

### math

A chemist has 80 pints of a 20% iodine solution. How many pints of iodine must be added to produce a solution that is 33.1/3% iodine? Please help me work this through Let X be the number of pints of iodine that must be added. You start out with a mix that contains 16 pints of ...

### Science

Jupiter, Saturn, Uranus, and Neptune: what is one reason why life probably does not exist on these four planets? A) They have no gravity. B) They are the gas planets. C) They are the giant planets. **** D) They are the rocky planets. Earth seems to be the only planet in our ...

### AP Physics

A cord runs around two massless, frictionless pulleys; a canister with mass m=20 kg hangs from one pulley; and you exert a force F if you are to lift the cord. a) What must be the magnitude of F if you are to lift the canister at a constant speed? b) To lift the canister by 2 ...

### math

Is this the right way to answer this question? A physics exam consists of 9 multiple-choice questions and 6 open-ended problems in which all work must be shown. If an examinee must answer 7 of the multiple-choice questions and 3 of the open-ended problems, in how many ways can...

### Physics

To qualify for the finals in a racing event, a race car must achieve an average speed of 225 km/h on a track with a total length of 1.4 km. If a particular car covers the first half of the track at an average speed of 205 km/h, what minimum average speed must it have in the ...

### Math

A saline solution is 20% salt. How many gallons of water must be added to dilute the mixture to 8 gals of a 15% saline solution? here is my method: using c1V1 = c2V2, (0.2)(V1) = (0.15)(8) V1 = 6 gals So, since 8 gals are required to dilute the saline solution of 15%, 8-6 = 2 ...

### Physics

To qualify for the finals in a racing event a car must achieve an average speed of 250 km/h on a track with a total length of 16,000 m if a particular car covers the first half of the track at an average speed of 230 km/h what minimum average speed Must It have in the second ...

### Math

Pat must pay a 6 percent state sales tax and a 2 percent city sales tax on school supplies. If the price of the supplies tax before taxes is $30.00, what is the total amount tha Pat must pay In Sales tax? A $0.25 B $0.90 C $1.80 D $2.40 E $2.60

### research writing

Can someone help with com 220 wk6 day 6-subject-Global warming: Write a 350 word paragraph that uses one of your arguments and counterarguments to support your thesis. Be sure to include the evidence that supports your thesis and that may support or refute the counterargument...

### science

1. How is the equator similar to the prime meridian? (1 point) Both the equator and prime meridian are lines that divide Earth into the Northern and Southern hemispheres. Both the equator and the prime meridian are imaginary base lines from which locations of Earth can be ...

### Physics

If you were to jump from an airplane at an altitude of 15000 ft. and fall toward the Earth at 100 mph how long would it take to reach the surface?

### Science

Describe the action and reaction force pairs involve when an object falls toward Earth. Ignore the effects of air resistance.

### physics

a kangaroo jumps to a vertical height of 2.55m.How long was it in the air before returning to Earth? pleaseee anwser it is due in 1 day!!!!

### science

using the numerical scale, one foot on the map would equal how many miles on earth's surface? show how you got your answer?

### world geography

The most accurate representation of the earth is a(n) ______. Azimuthal equidistant globe relief map Winkel Tripel projection

### Earth Science-9 help!!!

does monroe county produce any of these minerals??? talc zinc garnet gypsum lead magnetite halite titalium. plz help me...

### i need help on science

please somebody smart answer this question like Ms.Sue or anybody else. how are earthquake vibrations used to study earth's layers?

### trigonometry

assuming that Earth's radius is 6400 km, find the linear velocity of Quito, Equador, a city on the equator. (Use pi=3.1416 and 1.6 km=1 mile).

### chem.

A bird is flying around the world at a rate of 26.4 ft/sec. How many days will it take to complete its journey? (circumference of earth = 25,000 miles)

### earth science

1. What observations show that the universe is expanding? 2. What can astronomers infer from the fact that other galaxies are moving away from ours? Please help! Thanks :)

### chemistry

A bird is flying around the world at a rate of 26.4 ft/sec. How many days will it take to complete its journey? (circumference of earth = 25,000 miles)

### Earth Science

a sample of magma flows very quickly. Would you expect it to contain high or low amounts of silica? Why? please help

### Physics

If a 20 kg object fell to the surgace of the Earth froma height of 30 m, what would its final velocity be? (work problem from the stanpoint of linear motion)

### Grade 12 Chemistry

How does the rate of corrosion of iron on the moon compare to that on earth? I need enough info to write a whole paragraph on it...plz help

### EARTH SCIENCE

Which one of the objects listed below has the largest size. a-globular clusters b-galaxies c-stars nebula I think is B please help

### Earth Science

Where in the Atlantic Ocean would you expect surface water to sink and initiate a subsurface flow. List the reason(s) for your choice(s).

### earth space science

A chemical sedimentary rock that forms mainly in restricted ocean basins in areas with high evaporation rates is an

### Physics

What equations should I use to calculate the effective value of g, the acceleration of gravity (in meters/second^2), at 5800 km above the earth's surface?

### Physics earth & Space

toward what direction, north or south would you look to the sun at noon on june 21-22 if you lived at the following latitudes

### physics

what sould be the angular speed with which the earth have to rotate on its axis so that a person on the equator would weight 3/5th as much as present..??

### Earth Science

I need to calculate the discharge results for the following dates: April 4 2:52 mins 1.55 meters 5 2:40 1.63m 6 2:06 1.7m 11 1:17 1.86m 12 :59 1.82m 13 1:10 1.8m Please help me.

### chemistry

how long would it take a radio wave with a frequency of 7.25 x 10to the 5th to travel from Mars to earth if the distance is approx. 8.0 x 10 to the 7th?

### Calculus

Assuming the earth is a perfect sphere of raius 3950 miles, find (in inches) d. d, is the difference between the arc and a straight line.

### physics

what is the magnitude of the centripetal force acting on the earth as it orbits the sun assuming a circular orbital speed of 3.00 X 10^4 meters per second

### 5th grade math

Given 257 sec, 15,000 feet per second Find the acceleration due to earth's gravity.

### math

if an object on earth is projected upward with an initial velocity of 32 feetper second, then its height after t seconds in given by h(t)=32t-16t^2

### Earth Science

Explain why the following statement is incorrect: Climatologists use the data from ice cores to directly measure past temperatures.

### earth

#10 which of the following is an effect of divergent plate movement? a.) glacial activity b.) mountain building d.) canyon erosion e.) sea floor spreading

### 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.

### science

whether a stone thrown upword with very high speed fall to the same point to the ground? If yes then why even the earth is in motion?

### earth science

The point at which the continent stops and the rock of the ocean floor begins is the called the continental A. shelf. B. divide. C. drift. D. slope. is it d ?

### Astronomy

What is the size, i.e. the radius, of a black hole with a mass equal to that of Earth (MEarth=6×1024kg)? Give your answer to one significant figure.

### PEOPLE, SCIENCE, AND THE ENVIRONMENT

. If all life ceased on Earth, how quickly would the atmosphere become like that of Venus and Mars? Explain.

### science

which one of these are not used to power generators? A- wind B- moving water C- hot rocks under earth's surface D- static electricity

### Earth Science

1. What term is used to describe the process by which agents are carried from one place to another because of erosion? A. Disposition B. Deposition C. Reposition D. Transplantation B?

### Algebra

suppose a pendulum use to show the rotation of the earth has a period of approximately 16.9 seconds. What is the length using formula T=2pi sq root L/32

### mqth and science early childhood

Children do not need a variety of concrete experiences that enable them to learn the properties of Earth's materials

### Trigonometry

Assume that Earth's surface is a sphere of radius 12000/pi miles. In an hour how far can Felix "Travel" if he is stationary at a position on the equator?

### Science-Chemistry

How would I figure out how far the distance in kilometers between the sun and earth be if it takes 8.3 minutes for light to travel?

### calculus

Carbon-14 is a radioactive substance produced in the Earth's atmosphere and then absorbed by plants and animals on the surface of the earth. It has a half-life (the time it takes for half the amount of a sample to decay) of approximately 5730 years. Using this known piece of ...

### Algebra Functions

I cannot for the life of me remember how to do this- Find the vertex of the graphs of the functions: Function #1: y=(x-4)(x+2) AND Function #2: y=2x^2-4x+1 Can someone help me get it PLz! OK - to find the vertex of these functions you must have them in quadratic form where the...

### science

Finishing his ginger ale, Ramesh stands at the party holding his insulated foam cup that has nothing in it but 0.100kg of ice at 0 degree celsius. How much heat must be gained by the ice in order for all of it to melt? How much more heat must be gained to raise the temperature...

### physics

A police offer may warn that “speed kills.” In video games, high-speed crashes are common. Suppose a particular scene in a game required the following elements: • a high performance motorcycle must crash into a barrier and be stopped • a small scooter must crash into ...

### Physics

Suppose that a comet that was seen in 545 A.D. by Chinese astronomers was spotted again in year 1937. Assume the time between observations is the period of the comet and take its eccentricity as 0.11. What are (a) the semimajor axis of the comet's orbit and (b) its greatest ...

### physics

A ship leaves the island of Guam and sails a distance 280 at an angle 39.0 north of west. 1.In which direction must it now head so that its resultant displacement will be 125 directly east of Guam? (Express your answer as an angle measured south of east) 2.How far must it sail...

### math

The cheerleading squad is having a bake sale. They want to bake at least 120 cookies. They made 12 cookies the first hour and 24 cookies the second hour. a)Write an inequality that describes the scenario. Let Variable h represent the number of hours that must bake to meet or ...

### Physics

Sally Sue is atop a 10.0 m high platform where she will drop an apple straight down. On the ground below, and 20.0 m (horizontally) away, Betty Lou will shoot an arrow at the apple. If Betty's arrow has a release speed of 25.0 m/s, at what angle must she fire that arrow, and ...

### physics

A certain hydraulic system is designed to exert a force 100 times as large as the one put into it. (a) What must be the ratio of the area of the slave cylinder to the area of the master cylinder? (b) What must be the ratio of their diameters? (c) By what factor is the distance...

### Chemistry

Hi. I need some help with this. When you stretch a balloon against your lips, is heat given off or absorbed? Which driving force is dominating this change, the tendency toward lower energy or the tendency toward disorder? Heat is given off obviously but I don't know what to ...

### Physics

A cyclist intends to cycle up a 7.5 degree hill whose vertical height is 170 m. Assuming the mass of bicycle plus cyclist is 95 kg, calculate how much work must be done against gravity. If each complete revolution of the pedals moves the bike 5.6 m along its path, calculate ...

### maths/physics

A plane is flying in a straight line at an unchanging height and unchanging speed. The pilot must drop an object onto a target in front of the plane. At what angle must the pilot see the target at the moment of dropping the object? At that moment, what is the distance between ...

### plz help me in physics

A ship leaves the island of Guam and sails a distance 295km at an angle 35.0 north of west. a:In which direction must it now head so that its resultant displacement will be 100km directly east of Guam? (Express your answer as an angle measured south of east) b:How far must it ...

### Literature

This essay should have 5 paragraphs. In the 1st paragraph it must contain: Attention-grabbing beginning. Description of issue. Opinion Statement. In the 2,3, 4 paragraph should contain: Different reasons for each paragraph. Evidence to support. In the 5th Paragraph it should ...

### english

the task of economic policy is to create a prosperous america.the unifinshed task of the prosperous americans is to build a great society.these tasks remain unfinished:to achieve full employment without inflation-to enhance the effciency and flexibility of our private and ...

### Physics

A superhero flies 235 m from the top of a tall building at an angle of 25 below the horizontal. What is the horizontal component of the superhero’s displacement? Draw the vectors to scale on a graph to determine the answer. Answer in units of m Your answer must be within...

### physics

I am having so much trouble with this D: A rocket is traveling straight up from its launch pad. An observer 5.00 km from the launch pad notices that at one instant, she must tilt her telescope 45.0 degrees upward to see the rocket. 10.0 seconds later, she must tilt her rocket ...

### Science

Explain the following quote: ... it was several weeks before an emigrant from Earth could adapt to it. On the Moon the human body had to learn a whole set of reflexes. It had, for the first time, to distinguish between mass and weight. A man who weighed one hundred eighty ...

### Math (Confused)

How many international direct-dialing numbers are possible if each number consists of a four-digit area code (the first digit of which must be nonzero) and a five-digit telephone numbers (the first digit must be nonzero)? a. 567,000,000 b. 486,000,000 c. 1,053,000,000 d. 729,...

### maths

An ant must walk from one vertex of a cube to the "opposite" vertex (that is, the vertex that is farthest from the starting vertex) and back again to its starting position. It may only walk along the edges of the cube. For the entire trip its path must traverse exactly six ...