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

25,161 results, page 70

### 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

### 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 ...

### 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?

### physics

a student pushes with a minimum force of 50.0N on the middle of a door to open it. 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?

### physics

At a certain distance from a point charge, the potential due to the charge is |5.93 V, and the magnitude of the electric field is 13.5 V/m. (Take the potential to be zero at infinity.) Is the electric field directed toward or away from the charge? Here is my attempt. Since ...

### history

Must be eight to ten double-spaced pages in length and formatted according to APA style as outlined in the approved APA style guide. Must use at least 8 scholarly sources. My instructor wants me to write a essay with eight pages double spaced in lenght and formatted according ...

### Algebra2

Write an equation for the line that passes through (0,7) and is perpendicular to the line whose equation is y = 1/2x-1. my answer is y = 2x-7 is this correct? That can't be right, because when x=0, y must be 7. Furthermore, the slope of the line you want must be -2, to be ...

### math

2) Sven sells hamburgers at a ballpark. He earns $7.50/hour, plus $0.40 for each hamburger he sells. b) How many hamburgers must Sven sell to earn $100 in a 6.5 shift? How many hamburgers must Sven sell to earn $100 in a 6.5 shift?

### math,correction, bobpursly

Since when is 5^7 =8125? if a number is a multple of ten, that means the last digit is zero. The leading digit cannot be zero. 9*10^5*1 on c, again, the leading digit cannot be zero. d is right e. no leading zero is allowed. 9*9*8*7*6*5*4= ? can someone correct this for me ...

### physics

a)If you roll a putty ball around inside of a bowl, it soon comes to a rest in the center. A steel ball will orbit quite a few times before coming to rest in the center of the bowl. What would be the ideal motion of the ball in the bowl? (no friction) b) A car can accelerate ...

### science (conversion)

At the time of this books printing the national debt is about $8 trillion. (a) If payments were made at the rate of $1000 per second, how many years would it take to pay off the debt, assuming no interest were charged? (b)A dollar bill is about 15.5cm long. If 8 trillion ...

### Technology

I need to design and construct a device to be used in one of the following areas : 1)kitchen 2)workshop 3)nursery 4)school 5)outdoors 6)own choice The devise must use 3 or more of the following items 1)levers 2)gears 3)cams 4)pulleys 5)hydraulic systems 6)pneumatics systems I ...

### Geography

The city of Urbania was designed by city planners to address the needs of both the city's businesses and its citizens. Single-family housing will be limited. Most people will live in multi-unit housing, such as apartments or condominiums. Businesses must limit the height of ...

### Mr. James- Science-again

uh, ok ok, so if my answer is not a then is it b,c,or d because non of my answers match what you said Mr. James Precession means the axis of the Earth is changing, so North changes.

### Physics

Which one is a true statement? The magnetic field of the Earth: a)never changes b)continuously changes c) sometimes vanishes entirely d) is uniform Isn't it b) I know that a) and c) are wrong.

### Earth Science

an evidence is a material or data that can be measured and tested to verify their prediction so wat is the difference between evidence and scientific inquiry\ plz help and thank you

### phyics-universal gravity

A hypothetical planet has a radius 3.3 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface? (downward)

### ap enviromental

for a very long time, prokaryotes were the only living creatures on earth. how long a period? i would appreciate a straight answer please!!!

### physics

during space flight, astronauts often refer to forces as multiples of the force of gravity on earth's surface. what does a force of 5g mean to an astronaut?

### Physics: How much do you way on another planet

A person weighs 900 N on Earth. What would he weigh on another planet, where the free-fall acceleration is 26.4 m/s2? Answer in units of N.

### earth science

surface ocean currents located at 40 degrees south latitude 90 degrees west longitude generally flow toward the northeast?

### earth science

Earthquakes and valcanoes change Earths surface quickly. Can you name at least two processes that canchange earhts surface slowly?

### Science

Ignoring air resistance, an object falling near the surface of the Earth has an acceleration that is: A. constant B. increasing C. decreasing D. dependant on the weight of the object

### physics

suppose you stand on a bathroom scale and get a reading of 700N. in principle, would the scale read more, less, or the same if the earth did not rotate?

### Earth science

what is the amount of force required to keep a 10kg ball moving in a constant direction at a constant velocity of 1 m/s ( ignore the effects of fricton

### 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?

### Mechanics:Statics

Two 10 kg spheres are placed 500mm apart. Express the gravitational attraction acting on one of the spheres as a percentage to its weight on earth.

### Optics

Predict the size of the image of Jupiter if photographed at opposition with a lens having a focal length of 9600 mm ( Assume Jupiter is a disk of 1.43 x 10^5 km and is 6.29 x 10^8 km from the earth).

### Math

One model of Earth's population growth is , where t is measured in years since 1990, and P is measured in billions of people. Which of the following statements are true?

### phys

While spinning in a centrifuge, a 70.0 kg astronaut experiences an acceleration of 5.00 g, or five times the acceleration due to gravity on the earth. What is the centripetal force acting on her?

### physics

You fire a cannon ball from ground level at a speed of 20.0 m/s ∠30.0 Find the time taken for the ball to hit the earth. How far will it land?

### Physics

Calculate the weight of an astronaut whose mass (including spacesuit)is 72kg on the surface of the moon? What is the astronauts weight on Earth? Comment on the difference

### physics

How many kilometers would you have to go above the surface of the earth for your weight to decrease to 39{\rm \\%} of what it was at the surface? Express your answer using two significant figures.

### Science

which of the following features make earth and venus similar to each other ? (1point ) A . their size and mass b. their rates of rotation c. their atmospheres d. their directions of rotation****

### Science

which of the following features make earth and venus similar to each other ? (1point ) A . their size and mass b. their rates of rotation c. their atmospheres d. their directions of rotation****

### Biology ASAP

What is the scientific name ( genus and species level) of star fish, jelly fish, silk spider, mouse, and earth worm

### AP physics

The sun is below us at a magnitude of nearly a line with the earth center. Are we then Heavier at midnight due to the sun's gravitational force on us, than we are at noon? Explain