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

25,143 results, page 78

### algebra 1

snookers lumber can convert logs into either lumber of plywood. in a given day, the mill turns out three times as many units of plywood as lumber. it makes a profit of $20 on a unit of lumber and $50 on a unit of plywood. how many of each unit must be produced and sold in ...

### Physics

The acceleration due to gravity on the Moon is 1/6 of that of the Earth. Given the same initial velocity: How much higher will an object displace on the Moon? How much more time will it spend in the air?

### science

Using this concept, what role do we each play in sustaining life on Earth? How do our food choices affect our own consumption of the nonrenewable energy available to sustain life?

### ALGEBRA

Suppose it takes 3 days for a space vehicle to travel from the Earth to the moon. About how long would it take the same vehicle traveling a the same speed to reach Neptune?

### physics

A football on the moon (1/6 earth's gravity) is kicked straight up with an initial velocity of +14.5 m/s. If it starts 2.7 m above the surface, how much time has passed until it is 16.8 m above the surface and on its way down?

### Astronomy

Where do you have to be on Earth to see the south celestial pole at your zenith? What is the maximum possible elevation (angle) of the Sun above the horizon at that location? On what date is this maximum elevation achieved?

### Astronomy

Where do you have to be on Earth to see the south celestial pole at your zenith? What is the maximum possible elevation (angle) of the Sun above the horizon at that location? On what date is this maximum elevation achieved?

### earth science

discuss stellar evolution(briefly describe each stage). what forces are opposing one another throughout the life of a star and how do they influence the various stages in the life cycle of a star?

### sci 207

The idea of tectonic plates shifting across the earth’s surface is central to explanations of geologic processes. Why is this idea still called the “theory” of plate tectonic movement

### science

the distance from the earth to the moon is 240000 miles. if the speed of light is 2.998 x 10^8 meters per second, how long does it take for light reflected from the moon to reach our planet?

### 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? Fiqure is triangle with equal sides 2.5 m and base is 0.5 m

### Physics

A certain rain cloud at an altitude of 1.90 km contains 3.20 107 kg of water vapor. How long would it take for a 2.18-kW pump to raise the amount of water from Earth's surface to the cloud's position?

### Physics

The potential difference between a storm cloud and the ground is 2.13 Ã— 108 V. If a bolt carrying 2 C falls from a cloud to Earth, what is the magnitude of the change of potential energy of the charge? Answer in units of J.

### physics help plz thanks

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...

### physics need help plz

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...

### math

what would the dimensions of a retangle be whose perimeter is 50(P=50)inches when the length is 2x-5 ane the width is unknown The width must be 25 - (2x-5) = 30-2x, since the sum of the length and width must be half the perimeter. You do not have enough information to solve ...

### English

Literary Analysis Assignment I have to defend the villain in a fairy tale by persuading ymy audience that he or she was set up. I have to convince the audience that the villain has been misrepresented and his/her motives were misunderstood. The body of the essay must support ...

### Essay - Changed some things

Im doing an essay and this is the format for it. Intro of 5 or more sentences, where you introduce your thesis statement(that which you will be writing about - in the form of a statement, or point of view) Two or three paragraphs, of about 8-10 sentences each, where you ...

### STATISTICS

A3. A Retailing Entrepreneur sells sophisticated running shoes whose weights are assumed to be normally distributed with a mean of 12 grammes and a standard deviation of 0.5 grammes. (a) What is the probability that a shoe weighs more than 13 grammes? [3] (b) What must the ...

### government and politic (please help...i'm stuck)

One of the problems of liberty is that one person’s liberty sometimes conflicts with another’s liberty and one must take precedence. How would you resolve the following conflicts between rights of the individuals and why? [h] Fountain Valley High School has 80% minorities...

### Navigation/maths

I am curious to know what "sight reduction tables" are: I assume they give distance and bearing (azimuth) from one known (or assumed)location on the surface of the earth to another to the accuracy of the tables. Please can someone confirm or correct my assumption. Thanks Mike

### physics induced voltage

A Boeing 747 jet with a wingspan of 60.0 m is flying horizontally at a speed of 287 m/s over Phoenix, Arizona, at a location where the Earth's magnetic field is 50.2 µT at 58.0° below the horizontal. What voltage is generated between the wingtips?

### biology

Explain why a person should believe that all life that currently exists on planet earth evolved from a simple, common ancestor through the process of mutation, natural selection, sexual selection and genetic drift.

### physics

when a automobile moves overe a wide, closed loop of embedded in a road surface, the magnetic field of the earth within the loop altered? is a pulse of current produced? can you cite a pratical application for this at a traffic intersection?

### Physics

For some reason I keep getting this problem wrong. Please Help! A helicopter is ascending vertically with a speed of 9.00 m/s. At a height of 90 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?

### Physics

Find g at a point on earth where T = 2.249 s for a simple pendulum of length 1.250 m, undergoing small-amplitude oscillations. (Enter your answer to four significant figures.) CAN YOU PLEASE PROVIDE AN ANSWER WITH WORK . THANK YOU VERY MUCH!!!!!

### Physics

Find the magnitude of the gravitational force a 65.4 kg person would experience while standing on the surface of Earth with a mass of 5.98 × 1024 kg and a radius of 6.37 × 106 m. The universal gravitational constant is 6.673 × 10−11 N · m2/kg2. Answer in units of N

### science

tell what you believe would happen if the earth suddenly stopped spinning and you were in the part of the world that had sunlight 24 hours a day. Include such things as how this would affect your sleep, work, school and crime.

### Global Studies

Although the Amazon Basin receives more than 80 inches of rain per year, South America also has the driest place on Earth, know as a. Death valley b. Gobi desert c. Atacama desert*** d. the Caribbean

### Classical Mechanics

Approximate Lake superior by a circle of radius 162 km at a latitude of 47 degrees .Assume the water is at rest with respect to earth and find the depth that the center is depressed with respect to the shore due to the centrifugal force.

### Earth Science

Which aquartic biome would cypress, cedar, and dogwood trees, and submerged floating plants ne located? Lakes and Ponds Streams and RIvers Swamps Freshwater Marsh Saltwater Marsh Intertidal Zone

### physics

A mass m = 76.0 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius R = 19.7 m and finally a flat straight section at the same height as the center of the loop (19.7 m off the ground). Since the mass would not make it around the loop if ...

### Mathematics

a retailing entrepreneur sells sophisticated running shoes whose weights are normally distributed with mean of 12 grams and a standard deviation of 0,5 grams. (a) what is the probability that a shoe weighs more than 13 grams (b) what must be the standard deviation of weight be...

### Algebra 1

Samantha Jones has a job offer in which she will receive #600 per month plus a commission of 2% of the total price of the cars she sells. At her current job, she receives $1000 per month plus a commission of 1.5% of her total sales. a. What is the total price of the cars that ...

### fluid mechanics

The ares rocket has a liquid oxygen tank that sits on top of the core stage. The turbopump inlet for the engines on the core stage must have a certain pressure to operate correctly. The engine designer has asked you to calculate the range of pressures he must account for....

### science

For each of the activities listed below: 1. Describe one way in which work is done (Reminder: For work to be done, the force and the distance must be in the same direction.). 2. List two simple machines used in each task. 1. making a meal oven, microwave 2. traveling to school...

### Chemistry

The four statements below are used for applications of Hess's law. One of the statements is erroneous. Choose that statement. a) the value of delta H for any reaction that can be written in steps is the sum of the values of delta H for each of the individual steps. b) when an ...

### ELA (English)

And yet, Linenger recovered quickly. in fact, almost two dozen astronauts have lived in space for more than six months, and four have stayed in orbit for more than a year. These men and women faced the discomfort of weightlessness and overcame them and they all readapted to ...

### business Maths

Leslie Hart borrowed $15,900 to pay for her child’s education at Riverside Community College. Leslie must repay the loan at the end of 6 months in one payment with interest. (a) How much interest must Leslie pay? (Do not round intermediate calculation. Round your answer to 2...

### English

1. However rich you may be, you can't buy it. 2. However rich you are, you can't buy it. 3. However cold it may be, you must not stay indoors all day. 4. However cold it is, you must not stay indoors all day. -------------------- Which expressions are correct? Are they all ...

### Biology: Evolution

Scientists suggest that two energy sources, __________ and __________, broke the bonds in the gases in Earth's primitive atmosphere, releasing atoms to form __________. Help! I forgot my book at school! Please!

### earth sciecne

which landscape region of NY is composed of low hills of sorted sediments of Cretaceous and Pleistocene age? 1 the hudson- mohawk lowlands 2 the atlantic coastal plain 3 the complain lowlands 4 the erie- ontario lowlands. is it 4

### physics

A 3.60 kg ball is dropped from the roof of a building 184.8 m high. While the ball is falling to earth, a horizontal wind exerts a constant force of 12.1 N on the ball. How long does it take to hit the ground? (acceleration of gravity = 9.81 m/s^2)

### physics

A 4.05 kg ball is dropped from the roof of a building 171.4 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 12.5 N on the ball. How long does it take to hit the ground? The acceleration of gravity is 9.81 m/s^2.

### physics

A 3.61 kg ball is dropped from the roof of a building 152.5 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 11.6 N on the ball. How long does it take to hit the ground? The acceleration of gravity is 9.81 m/s^2

### science

The orbits of planets being elliptical was one the planetary laws developed by ==A. Kepler. B. Brahe. C. Ptolemy. D. Copernicus. If a car travels from Town A to Town B on one road at different speeds and stops at red lights, knowing the distance between the towns and the total...

### math

Patel, Quoc and Ron live near each other along the same straight road. Patel lives 0.6km from Quoc. Ron lives 0.4km from Patel. How far apart do Quoc and Ron live? A) They must live 0.2km apart. B) They must live 1.0km apart. C) They could live 0.2km or 1.0km apart. D) They ...

### physics- vertical circular motion

For the normal force in the drawing to have the same magnitude at all points on the vertical track, the stunt driver must adjust the speed to be different at different points. Suppose, for example, that the track has a radius of 2.06 m and that the driver goes past point 1 at ...

### physics

At what speed should a space probe be fired from the earth if it is required to still be traveling at a speed of 3.48 km/s, even after coasting to an exceedingly great distance from the planet (a distance that is essentially infinite)?

### Earth science..... help urgent

hi can anyone help me? my problem is that i need to write a autobiography about the "LIFE CYCLE OF ROCKS". andf i have no idea how to start it.....plz help me....its urgent....give me some clues how to start !!!!

### uphysics

Some planetary scientists have suggested that the planet Mars has an electric field somewhat similar to that of the earth, producing a net electric flux of 3.57×1016 into the planet's surface.

### Physics

A rocket is launched from rest. After 8.0 min, it is 160 Km above the Earth’s surface and is moving at a speed of 7.6 Km/s. Assuming the rocket moves up in a straight line, what are its (a) average velocity and (b) average acceleration?

### physics

The weight of the atmosphere above 1 m^2 of Earth's surface is about 100,000 N. Density, of course, becomes less with altitude. But suppose the density of air were a constant 1.2 kg/m/s^3. Calculate where the top of the atmosphere would be.

### physics

The weight of the atmosphere above 1 m^2 of Earth's surface is about 100,000 N. Density, of course, becomes less with altitude. But suppose the density of air were a constant 1.2 kg/m/s^3. Calculate where the top of the atmosphere would be.

### physics

The weight of the atmosphere above 1 m^2 of Earth's surface is about 100,000 N. Density, of course, becomes less with altitude. But suppose the density of air were a constant 1.2 kg/m/s^3. Calculate where the top of the atmosphere would be.

### earth science

#26 An inference is_____ A" using your sense to gather data B" a conclusion mad based on data C" a prediction about the results of an experiment D" a persons feeling or judgment about something

### math

a pit is dug in the shape of a cuboid with dimensions 10m*8m*3m. the earth taken out is spread evenly on a rectangular plot of land with dimensions 40m*30m. what is the increase in the level of the plot.

### Physic II

A 992.0-g iron meteor impacts the earth at a speed of 1447.0 m/s. If its energy is entirely converted to heat of the meteorite, what will the resultant temperature rise be? (The specific heat for iron is 113 cal/kg.C)

### Space Exploration

Give two reasons why observatories are still being built on Earth instead of launching more space telescopes? I I'm assuming one reason is the cost but can't find another reason .

### Physics. Interesting group question

Does Newton's laws apply on earth even though we are constantly accelerating? I thought it would be true because it would apply to the uniform circular motion wouldn't it?

### history

all I need is sequence of events of Earth's history for the Mesozoic and Cenozoic eras. just facts that I could put up. I believe the Mesozoic era was the fist one with humans in it? (IN ORDER PLEAEE)

### physics math

A cruise ship moves southward in still water at a speed of 20.0 km/h, while a passenger on the deck of the ship walks toward the east at a speed of 5.0 km/h .The passengers velocity with respect to Earth is?

### Science Earth

Guard cells are closed during the night. This means that no gases can come in or out of the stomata. Why would the plant not need to take in gas during the night? How can I answer in this question?

### Calculus

Redo problem 8 in section 6.3 of your textbook (page 288) assuming that the parents need $105000 in 9 years for college expenses, and that the bank account earns 9.25% compounded continuously. Round your answers to the nearest cent. (You may need to compute your answers to 4 ...

### geography

What part of a map tells the relationship of distance shown on the map to real distance on the Earth? My answer is a map scale. Is this correct?

### science

A book is on top of a table. Earth's gravity exerts a constant force of 15N on the book. Why does the book not move as a result of this force?

### Math

The mass of the Earth is close to 5.97x10^24 kg and the mass of Venus is close to 4.87x10^24 kg. What is the approximate combined mass of both planets A.1.08x10^25 B.2.91*10^49 C.1.08^10^48 D.1.08*10^25

### Science

What is a good science project to do? I am in 8th grade and am studying earth science. I need to present the project in front of class. Im really nervouse.

### Physics

A train is moving 50km/h east. A person is walking 5 km/h west on the train. How fast is the person on the train going relative to an observer on the earth?

### earth

A winding natural stream with weeds has an average depth of 0.86m and is 7.25m across. The stream channel drops 0.34 m/km. What is the stream’s average velocity?

### Physics

A rocket of 500 kg accelerates away from earth with an engine thrust of 13,500 N. a) what is the weight of the rocket? 4900 N b) how fast did the rocket accelerate? (I know the answer is 17.2 m/s^2 but how did they get that?)

### Earth Science to Ms.Sue (urgent )

18. The Cenozoic Era is also referred to as the A. Age of Dinosaurs. B. Age of Mammals. C. Age of Fish. D. First Era. B???

### Science

40 degrees north runs along 146th street on the north side of Indianapolis. What is the rotational velocity of the surface of the earth at 40 degrees north?

### 3 grade english ms sue

vowels: r-controlled riddle read a clud and write the list word. when you have written all seven word, the answer will appear in the boxes. THIRD,EARLY, WORLD, CERTAIN, DIRTY, HERSELF, EARTH, WORD, PERFECT, VERB, NERVE, WORM, THIRSTY, WORKOUT, EARN what building has the most ...

### Calculus

Suppose f(x) is a differentiable function with f(-1)=2 and f(2)=-1. The differentiable function g(x) is defined by the formula g(x)=f(f(x))' A. Compute g(-1) and g(2). Explain why g(x)=0 must have at least one solution A between -1 and 2. B. Compute g'(-1) and g'(2) in terms ...

### Chemistry

Assume that the normal blood buffer contains 0.00080 M carbonic acid and 0.0085 M hydrogen carbonate, the pKa = 6.35 for carbonic acid and the volume of blood in the body is 7.00 L. The blood pH, due to disruption is now 7.20. What is the ratio of [HCO3−]/[H2CO3] now ...

### Math

A 6.4 ton military fighter must land on a flight strip. If the plane lands at a speed of 368 mph, and the coefficient of kinetic friction is 0.72 between the wheels and the ground. If the runway must be at least 150% as long as the shortest possible landing distance of the ...

### Structure of Earth

Differences between Lithosphere and Asthenosphere. Im contrasting the two layers. Lithosphere: -rigid -cool -contains crust and upper part of mantle -brittle -doesn't flow -divided into tectonic plates -consists of heavier oceanic basalt -consists of lighter continental rock -...

### math

Why is it important to simplify radical expressions before adding or subtracting? How is adding radical expressions similar to and different from adding polynomial expressions? Provide a radical expression for your classmates to simplify. In your own words, explain the first ...

### physics

The difference between energy radiated from the sun and energy radiated from the Earth has to do with ____________________. A) Neither of these.B) Both of these.C) radiation frequencies.D) the amounts of radiant energy.

### physics

The difference between energy radiated from the sun and energy radiated from the Earth has to do with ____________________. A) Neither of these.B) Both of these.C) radiation frequencies.D) the amounts of radiant energy.

### science

if a rock undergoes high temperatures and high pressures deep within Earth, what new type of rock will be foremed? Assume that the rock does not melt

### Science

istance of a planet from sun is four times the distance of the planet frpm earth.How many years will the planet take to complete one revolution of sun?

### math

An object that weighs 10 ib on earthwould weigh only 4 ib on mars. If you weigh 95il on earth, how much would you weigh on mars?

### earth science

If the temperature at the surface is 230 C, what is the temperature at a height of 2 km under average conditions (when temperature decreses with height by 6.50 C per km)?

### algebra

how do you write and solve an equation to determine the radius of mars the radius of earth is 6378.1 km, which is 2981.1 km longer than the radius of mars

### earth

why was Copernicus model accepted over the geocentric model, even when it did not predict stellar event any better than the geocentric model

### science

As an object get farther from earth is A. its weight increase B.it weight decrease C. it mass decrease D. it weight remains the same I am not sure but is it A(or b)

### Chemistry

What are the elements in Group A1 on the periodic table? alkali metals alkali earth metals inner transition metals ** halogens

### physics

Party hearing. As the number of people at a party increases, you must raise your voice for a listener to hear you against the background noise of the other partygoers. However, once you reach the level of yelling, the only way you can be heard is if you move closer to your ...

### physics

Party hearing. As the number of people at a party increases, you must raise your voice for a listener to hear you against the background noise of the other partygoers. However, once you reach the level of yelling, the only way you can be heard is if you move closer to your ...

### English

I don't know how to start the rephrase of Chapter 1 of Jane Austen's Pride and Prejudice. Can you please have a look at it? I didn't include all the details. Thank you. 1) Chapter one opens with what seems to be an aphorism by the author herself: it is a universal truth that...

### Geography

(continued from yesterday) Eastern Europe. Where on Earth? Sept. 18: Traveled south and arrived today in the town associated closely with Hans Christian Andersen. Weather here a bit rainy, but we're having too much fun to care! (Odense, Denmark?)

### Physics

A military helicopter on a training mission is flying horizontally at a speed of 60.0 m/s and accidentally drops a bomb (fortunately not armed) at an elevation of 350 m. You can ignore air resistance. Find the horizontal and vertical components of its velocity just before it ...

### Social studies (Update answer)

I think its B. ? If its wrong I swear I wont ask again. What is a limitation of any map? A. It shows only a part of the Earth. B. There is always some distortion. C. The scale affects what can be shown accurately. D. The seas are never in exactly the right location

### chemistry

Calculate the mass of the solid you must measure out to prepare 100 mL of 0.025 M CuSO4. Note that this salt is a hydrate, so its formula is CuSO4⋅5H2O. You must include the waters of hydration when calculating the formula weights. Would the following set-up yield the ...

### Biology (Please Help: Urgent)

The Hardy-Weinberg formulas allow scientists to determine whether evolution has occurred. Any changes in the gene frequencies in the population over time can be detected. The law essentially states that if no evolution is occurring, then an equilibrium of allele frequencies ...

### Accounting

Directions: Be sure to make a copy of your answer before submitting it to Ashworth College for grading. Unless otherwise stated, answer in complete sentences, and be sure to use correct English spelling and grammar. Sources must be cited in APA format. Your response should be ...

### Maths Ms sue

Select the TWO options that are TRUE statements about survey sampling. Select one or more: (1)Cluster sampling usually increases the sampling error compared to a simple random sample of the same size. (2)In stratified sampling, each member of the population must be in exactly ...