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

24,970 results, page 69

### Math

Once there four boys who wanted to cross a street. They were all on the same side. It was night time and they only had one flashlight between them. Only two boys can cross the street at a time, and anyone who crosses , either one or two people, must always have a flashlight ...

### Science, please! help!

1. How does sea-floor spreading occur? a.New materials are being added to the atmosphere. 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 feature form the ...

### Discrete Math

7.A group has 9 women and 7 men. d. Suppose 2 members of the group refuse to work together. How many subgroups of 5 can be chosen 8. In how many ways can 16 people be seated: a. In a row, if 4 of the 16 do not want to sit next to one another b. In a row, if 3 of the 16 must be...

### Discrete Math

7.A group has 9 women and 7 men. d. Suppose 2 members of the group refuse to work together. How many subgroups of 5 can be chosen 8. In how many ways can 16 people be seated: a. In a row, if 4 of the 16 do not want to sit next to one another b. In a row, if 3 of the 16 must be...

### world history

Which of the following is NOT true about the arms race between the United States and the Soviet Union during the cold war? A. The Soviet Union created the first man-made satellite, prompting the United States to develop the National Aeronautics and Space Administration (NASA...

### Allied Health

What is a doctor’s responsibility if a patient requests restrictions on the use of his or her PHI? A. The doctor must comply with the patient’s wishes. B. The doctor need not comply with the patient’s wishes if HIPAA would otherwise permit restrictions. C. The doctor ...

### physic

Average Speed 1. In the 2008 Summer Olympics, Usain Bolt won the 100-m race in 9.69 s. What was his average speed? 2. Light from the sun reaches Earth in 8.3 min. The speed of light is 3.0108 m/s. How far is Earth from the sun? 3. In Major League Baseball, the distance between...

### statistics

You are the owner of an auto repair service. History tells you it takes on average 45 minutes to complete a repair job. You have determined the standard deviation for a job is 6 minutes. A women comes into your shop and tells you she must leave her car for repair, and that she...

### math,question

okay i really don't understand this problem. It says: Prove the point-slope equation property which is : Point-slope equation(an nonvertical line with slope m and containing a point (X1,Y1) has the point-slope equation of y-y1=m(x-x1). Now show that any point (x2,y2) on the ...

### Geometry-help

If a rectangular solid has a volume of 27 and at least one edge the length of 3,which of the following Must be true? I,m not sure??? a.The solid is a cube b.Exactly 4 edges of the solid have a length of 3 c.Exactly 6 edges of the solid have a length of 3 d.The product of the ...

### chemistry

Your body deals with excess nitrogen by excreting it in the form of urea, NH2CONH2. The reaction producing it is the combination of arginine (C6H14N4O2) with water to give urea and ornithine (C5H12N2O2). C6H14N4O2 + H2O NH2CONH2 + C5H12N2O2 [Molar masses: 174.2 18.02 ...

### Algebra

Could you please check my work on these word problems? My solutions just don't seem right, could you please let me know where I may have messed up. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on Earth...

### math

Please help me on linear relation. I have tries but I am really stuck on the creating table and graphing. 1. provide a table of six values that represent a linear relation. All the y-values must be less then zero. 2. provide a table of six values that does not represent a ...

### Earth Science

I'm doing a crossword and cannot figure this last one out. The clue for it is: Application of scientific discoveries. It has 10 letters, the 5th letter is an N and the 10th letter is a Y.

### Astronomy

If a comet has a perihelion distance of 1.AU and an orbital period of 125 Earth years.. What is the comet's aphelion? Cannot seem to find the correct calculation

### Astronomy help

If a comet has a perihelion distance of 1.AU and an orbital period of 125 Earth years.. What is the comet's aphelion? Cannot seem to find the correct calculation

### earth science

When air is saturated, the relative humidity is 100%, the air is holding the max. amt. of moisture, and condensation can occur. True?

### physics...

T^2=((4pi^2)/(GM_E))r^3 Substitute the period in seconds, T = 86,400 s, the gravity constant G = 6.67 multiplied by 10-11 kg-1 m3/s2, and the mass of the Earth, ME = 5.98 multiplied by 1024 kg. Solve for r.

### sciecne

Which agent probably contributes most to the genral wearing down of Earth's surface? explain i know the answer is "running water" but how to explain it?

### Science

On the surface of the Earth, it is approximately 6,200 miles to the North or South pole. How many miles is it between two parallels 5 degrees apart?

### physics

calculate the force on an airplane which has acquired a net charge of 180 C and moves with the speed of 180 m/s perpendicular to the earth's magnetic field 5.0 x 10^-5 T.

### Physics

A man weighs 1220 N on Earth. What would he weigh on Jupiter, where the free-fall acceleration is 25.9 m/s2? The acceleration of gravity is 9.8 m/s2 . Answer in units of N.

### Science

If the moon rotated on its axis just as quickly as Earth's, would we always see the same side of the moon? Explain. -thanks, Sandra

### chemistry

The distance from Earth to the Moon is approximately 240,000 .What is this distance in meters? Express your answer using two significant figures.

### Earth/Space Science

Explain why scientific ideas that have been subject to many tests are still considered theories and not scientific laws.

### physics

You are an astronaut (m = 80 kg) and travel to a planet that is the same mass and size as Earth, but it has a rotational period of only 11 h. What is your apparent weight at the equator of this planet?

### Phsics

A man weighs 772 N on Earth. What would he weigh on Jupiter, where the free-fall acceleration is 25.9 m/s2? The acceleration of gravity is 9.8 m/s2 . Answer in units of N

### physics

which statement is true about weight 1) pull of earth on a body 2) mass of a body 3) scalar quantity 4) unit per kilogram

### physics

which statement is true about weight 1) pull of earth on a body 2) mass of a body 3) scalar quantity 4) unit per kilogram

### calculus

A projectile is shot upward from the surface of the Earth with an initial velocity of 120 meters per second. What is its velocity after 5 seconds?

### Physics

A plane is headed east with an air speed of 294.0 m/s. The wind blows southeast at 42.0 m/s. Find the velocity of the plane relative to the earth.

### Physics

If you throw a 36 kilogram rock off a cliff , how fast does it accelerate to the ground? The earth excerts a force of 200 Newtons on the rock.

### math

One estimate for the distance from earth to the andromeda galaxy is 2,400,000 light years. What is this distance expressed in scientigic notation?

### physics

You are an astronaut (m = 90 kg) and travel to a planet that is the same mass and size as Earth, but it has a rotational period of only 15 h. What is your apparent weight at the equator of this planet?

### earth science

if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days

### earth science

if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days

### earth science

if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days

### pre calculus

Write the equation of the circle in standard form. Find the center, radius, intercepts, and graph the circle. x^2+y^2-12x-4x+36=0 How on earth do I do this?

### Science

Describe the geomorphic processes that shape the Earth’s surface. Use the Yosemite Valley to explain one or more of those processes.

### physics

an object weighs 10N on earth .what is the objects weight on a planet one tenth the earths mass and one half its radius?

### Physical Science

An astronaut in a spacesuit has a mass of 100 kilograms. What is the weight of this astronaut on the surface of the Moon where the strength of gravity is approximately 1/6 that of Earth?

### Physic II

How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the Earth) of one of the protons?

### Physic

How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the Earth) of one of the protons?

### EARTH SCIENCE- SO STUCK

How far from an earthquake epicenter is a city where the difference between the P-wave and the S-wave arrival times is 5 minutes and 00 seconds?

### Science

The geologic time scale originally ordered earth's rocks by? a) Absolute age. b) Relative age. c) Composition. d) Decades and centuries.

### physics

How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the earth) of one of the protons? (

### science

By studing rock layer scientist can learn about changes in earth formation and climate. True or false. Is the anser true

### science

Heat and pressure change rock inside the earth crust into gneiss. What type of rock result. Is the answer igneous

### P.E. help

Non-renewable resources mean it takes a longer time for the earth to produce it than the rate at which we use it. True False Is the answer True?

### Physical Science

An astronaut in a spacesuit has a mass of 100 kilograms. What is the weight of this astronaut on the surface of the Moon where the strength of gravity is approximately 1/6 that of Earth?

### science

according to wegeners hypothesis of continental drift ? A. Earths surface B. The continents C. Earth is slowly cooling and shrinking D. The continents joined

### Science

It can be inferred from the passage that radioactive dating is important for estimating the age of A) all known meters B) all existing planets C) the earth D) the trees

### English

Choose the best action or situation. An example of a metonym for the planet earth. soil globe rock moon Answer: globe

### physics

How do the laws of physics apply to others sciences such as biology chemistry and earth science? And give an example to show the connection.

### Physics

If you jumped off a 25 meter cliff on the moon (gravity being 1.66) what would be a comparable hight of that cliff on earth? the answer and show me how to get it.

### Chemistry

A good vacuum pump on Earth can produce a vacuum with a pressure as low as 1.96 × 10-8 torr. How many molecules are present in each milliliter at a temperature of 23.0ºC?

### Physics

An 8.0-kg history textbook is placed on a 1.25-m high desk. How large is the gravitational potential energy of the textbook-earth system relative to the desktop?

### Earth Science

i need to find out how many rabbits it would take to eat 24.447,000 dandelions in 30 minutes at a rate of one dandelion in 7 seconds... any ideas how to set this up?

### world Geo

What part of a map tells the relationship of distanceon the Earth? I'm thinking the answer is the scale,some of the scales shows miles and killometers... I think i am right but I'm not sure of it.

### Science

Hello, could someone help me with this question please? Explain how burning wood or coal to heat your house may contribute to global warming by altering the energy balance at the Earth's surface? Thank you

### science

based on how we are treating our earth today. what events have led to what humans want from a place in the movie called pandora. thinking of climate, carbondioxide and greenhouse gases.

### Earth

Has the issue of global warming been solved already? I mean, the Kyoto accord will expire in 2012. And are the glaciers of the North & South Pole melting even more?

### science

sedimentary rock is formed from bits and pieces of dirt, clay and sand that have been carried. a) on the earth's crust b) underground c) in rivers and streams d) over mountaintops

### physics

the gravitational field strength at the earth's surface is 10n/kg. calculate the wight of the following: A. a person of mass 80kg B. a 2kg bag of sugar C. a 125kg pack of tea

### physics

A hypothetical planet has a radius 1.1 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface? Express your answer using two significant figures.

### Science

Which of these would cause a rapid change in the appearance of the Earth's surface? A. Erosion and deposition by a river B. Earthquake C. Summer waves on Galveston's beach D. Weathering of rocks by acid rain

### Earth Science

which of the following locations in New York State is most likely to have the smallest range in temperature? 1. Long Island 2. the Catskills 3. Albany 4. the Adirondack Mountains

### chem

the atom of element A has 2 electrons in its highest energy level N. a)what is the special name given to elements in the same gp as A? i answered as alkali earth metal because the valence electron is 2. am i right?

### Science

If someone could check my answer: Dynamic lows are accentuated due to the fact that they rotate in the same direction as the Earth's surface (Cyclonic flow). This is called-----CORIOLIS EFFECT....Thanks

### 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

### world geography

Where on Earth? which of the 12 northern eurasian cities will be the home of your company's newest restaurant? hint: use information from an atlas and al almanac to eliminate all but one city

### Earth science

In a few sentences, explain how information from paleoglaciation and paleomagnetism support the idea that continental plates have moved over the past several million years.

### Physics

To better comprehend the magnitude of the gravitational force between Earth and the moon, pretend gravity is turned off and the pull replaced by the tension in a steel cable need to be?

### Physics!

Consider someone in a rotating space habitat. The outward force felt by the person A.has no reaction counterpart B.is an interaction with Earth C.is a form of gravity D.is real in the traditional sense

### Science

Earthquakes occur on the earth today, so we can assume they occurred in the past. Which important geologic principle does this sentence support? A. original horizontality B. faunal succession C. superposition D. uniformitarianism**

### Earth Science

18. How many chemical reactions are possible regarding the formation of carbonic acid and the dissolving of calcite? A. 23 B. 10 C. 2 D. 3 I am stuck on this I looked in my text book and it shows the words but not the number answers!

### physics

If a person weighs 700N on Earth, what force due to gravity would they exert on a 1500kg car they are standing 1.5m from? Assume the distance is between their centres of mass. F=Gm1xm2/r^2?

### Science

Having trouble with the independent and dependent variable in an if then statement. "If root growth is related to gravity, then roots will always turn toward the earth regardless of a seed's orientation."

### geography..please check my answers!!!

which pair of basic questions guides geographers in their work? where are things located? and Why are they there? **** What is the climate? and Why was it changed? When did Earth form? and What is it made of? Who lived where? and When did they move?

### Health

Which profession should a person who suffers from chronic asthma probably stay away from? A. Criminal attorney <<<<< B. Earth science teacher C. Grocery store manager D. veterinarian.

### Physics

How much faster would a person be moving if they stood on top of a 18.2 m high building compared to the ground? Take the period to be one day, and the radius of the earth to be 6400 km?

### Astronomy

The gravity lock of the Moon to Earth is silimar to the action of a A) giant pendulum B) spinning top C) master key D) tidal wave E) magnetic compass I'm torn between A and E.

### Physics0

how to estimate the root mean square speed of hydrogen molecules in the earth's atmosphere in km h^-1? thanks for your help, I'm actually teaching myself physics and that why sometimes I get stuck even with simple questions

### algebra (please help)

A small fast-food restaurant invests $4,000 to produce a new food item that will sell for $4.59. Each item can be produced for $2.19. (a) How many items must be sold to break even? (Round your answer to the nearest whole number.) items (b) How many items must be sold to make a...

### algebra

Sam must have an average of 70 or more in his summer course to obtain a grade of C. His first three test grades were 75,63, and 68. write an inequality representing the score that sam must get on the last test to get a C grade http://www.jiskha.com/display.cgi?id=1168389528

### algebra

A small fast-food restaurant invests $4,000 to produce a new food item that will sell for $4.59. Each item can be produced for $2.19. (a) How many items must be sold to break even? (Round your answer to the nearest whole number.) items (b) How many items must be sold to make a...

### Math Problem (please help)

A small fast-food restaurant invests $4,000 to produce a new food item that will sell for $4.59. Each item can be produced for $2.19. (a) How many items must be sold to break even? (Round your answer to the nearest whole number.) items (b) How many items must be sold to make a...

### Physics

a)What speed must one frame of reference be moving relative to another for the two to disagree about the length by 1% b)What speed must one frame of reference be moving relative to another for the two frames to disagree about time intervals by 1%? Both answer should be ...

### chemistry

Why must a calculated answear generally be rounded? and how many siginificant figures must you round an answear to when performing multiplication or division? http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch1/sigfigs.html

### CALCULUS

we know the series from n=0 to infinity of c(sub n)*3^n converges 1. TRUE OR FALSE the series from n=0 to infinity of c(sub n)*2^n must converge 2. TRUE OR FALSE The series from n=0 to infinity of c(sub n)*4^n must converge 3. TRUE OR FALSE the series from n=0 to infinity of c...

### college physic

A stunt driver wants to make his car jump over 8 cars parked side by side below a horizontal ramp.(a)With what minimum speed must he drive off the horiontal ramp?The vertical height of the ramp is 1.5m above the cars and the horizontal distance must be clear is 20m.(b)If the ...

### college physic

A stunt driver wants to make his car jump over 8 cars parked side by side below a horizontal ramp.(a)With what minimum speed must he drive off the horiontal ramp?The vertical height of the ramp is 1.5m above the cars and the horizontal distance must be clear is 20m.(b)If the ...

### MATH WORD PROBLEMS

PART A Camilla has a rectangular print that is 34 inches wide and 26 inches tall. She wants to center it on the wall above the television in her living room. The television is placed i front of a rectangular wall in the living room that is 18 1/2 feet long and 9 3/4 feet tall...

### English grammar

During the lesson the teacher has learning our about perception and interpretation. We must be awareness what we are seeing, and how we do interpret an object. During lesson of managerial skill teacher show us a pictures of wish that we must interpretation. In this lesson, I ...

### Writing inequalities

you must have an average score of at least 80 to get a B on your report card. You have scores of 61,70,99, and 70. What is the minimium score you must get on the last test to get a B on your report card? how do you work this problem out? You have four test scores. You need 5 ...

### Microeconomics

why there is an assumption "there must not be a resale between two markets" for price discrimination "There must not be aresale between the two markets"-is not an assumption under price discrimination but apre-condition for price discrimination. If there there remains a ...

### Programming

please Help... Write a pseudo code that prompt the driver to enter the miles at the before taking the car and miles when returning the car.the program must him to enter the fuel consumed that day.the must be able to determine the fuel consumption for that vehicle i.e so much ...

### Physics

1. If a bar magnet is broken into two pieces, how many magnetic poles are there? 2. A long straight wire carries a current in the direction shown in the following figure. At the point labeled A, is the direction of the magnetic field left, right, up. Down, into the page, or ...

### physics

A student pushes with a minimum force of 50.0N on a middle of a door to open. A. What minimum force must be applied at the edge of the door to open?. B. What minimum force must be applied at the hinge of the door to open?