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

25,359 results, page 74

### Earth Science

During the Dinosaur Ages, if there was a region with a mountain range, alluvial plain, and a shallow sea. Which place would it be the most likely for dinosaur fossils to be formed?

### Science

Need help on the question below...I know it is not C or D The formation of metamorphic rocks depends on all of the following except a. the composition of parent rocks b. Earth's magnetic field c. temperature d. pressure Thanks

### Physical Science

a rocket moves through outer space at 11,000 m/s. At this rate, how much time would be required to travel the distance from Earth to the Moon, which is 381,000 km?

### math

A 40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form a plat form of dimension 28m by 22m. Find the height of the platform.

### Physics

Calculate the energy needed to accelerate a spaceship of mass 10,000 kg to a speed of 0.3c for intergalactic space exploration. Compare with the projected energy usage of the Earth in a decade 10^22J?

### Physics

What is the apparent weight of a 70-kg astronaut 3800 km from the center of the earth's moon in a space vehicle moving at constant velocity and acceleration toward the moon at 2.9m/s^2? State the direction in each case.

### int.science

The earth can be considered a heat engine because it receives heat from the sun and converts it into mechanical energy to produce winds and evaporate water. True False

### Physics

suppose you have a weight of 60 N. if the earth's mass decreased to one fourth its current mass, with no change in radius, then what would you weigh? Can you please explain how I can solve this problem?

### Science

Mount St. Helens, the Great Lakes, and Death Valley are physical features of the earth. What is the scientific term used to describe these features? A. cartography B. topography C. geology D. contourology

### algebra

You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1.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 also varies ...

Describe a sporting situation that has quadratic characteristics. Use key terms such as maximum or minimum, starting or ending points(ordered pairs), shape, vertex, etc. to explain why the situation could be considered to have quadratic characteristics. A complete response ...

### Essay- Added a bit more

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 ...

### nuclear physics

A researcher wishes to extract 140 La from 140 Ba. She obtains a 1000 MBq virgin Ba-140 sample and must wait until the maximum activity of La-140 is available. a) Write down the decay relationship (include half-lives), and include the final stable product. How long must the ...

### maths

Starting with x0 = 0 (x0 has diagonal 0 that is smaller and towards the bottom) use the iteration formuala xn+1 = 4/ xn^2 +5 twice (for xn+1 the n+1 is smaller than x and diagonal towards the bottom also for xn^2 the n^2 is smaller than the x and diagonal towards the bottom of...

### science

I'm stuck on the following questions 1)The geocentric model of the universe states that the Earth is the center of the universe. This is an example of a A)scientific conclusion B)pseudoscience C)scientific law*** D)Scientific method Through process of elimination i know its ...

### physics

gravational force deimos, a satellite of amrs, has an average radius of 6.3 km. If the gravational force between deimos and a 3.0 kg rock at its surface is 2.5x10(-2)N..what is the mass of deimos ? Use the Universal Law of gravitation: Force= G Mm/distance^2 Solve for M. i did...

### Science Quiz 5 questions but on #4

Which describes the genes on each pair of chromosome? alleles can be different; genes are in the same order alleles must be the same; genes are in different order alleles can be different; genes are in different order alleles must be same; gene are in same order I think its C ...

### Statistics

If P(A/B)=1 must A=B?

### language arts

Be still, sad heart! and cease repining; Behind the clouds is the sun still shinning; thy fate is the common fate of all, into each life some rain must fall some days must be dark and dreary 1. from the context, what do you conclude is the probable meaning of repining in the ...

### College Physics

Which of the following statements is false? 1)The velocity of an object can change while maintaining a constant speed. 2)An object that maintains a constant speed must have zero acceleration. 3)An object that has a non-zero acceleration must have a changing velocity. 4)The ...

### Probability

Roll two fair dice. what is the probability that you get a 2 and a 5 without regard to which is on which die? What is the probability of at least one 2 or one 5? What is the probability of a sum of 7? "what is the probability that you get a 2 and a 5 without regard to which is...

### second revision

Discuss an environmental problem that you feel is significant in your town or city. What are some causes? Are any of these causes related to human values and environmental ethics? Explain. (Ms. Sue I am a bit confused about the second question) The city of Miami located on the...

### English

Thank you, very much. Here is the second part. I will post you the whole summary again after your correction. 1) Mr Otis’s daughter, Virginia, finds the ghost and he talks to her about his story. Virginia takes the ghost seriously and decides to help him. 2) The last part of...

### PHYSICS

A ball on a string moves in a vertical circle. When the ball is at its lowest point, the tension in the string is equal to the ball's weight. (i said true..?) A small projectile is launched horizontally 1 m above the surface of a smooth, airless planet, with sufficient speed ...

### Math

The bus fare in a city is \$2.00. People who use the bus have the option of purchasing a monthly coupon book for \$ 20.00. With the coupon book, the fare is reduced to \$1.00. Determine the number of times in a month the bus must be used so that the total monthly cost without the...

### Science--Help.

Which of the following is NOT one of the eight most common elements in Earth’s continental crust? carbon silicon oxygen aluminum The most abundant element in Earth’s continental crust (by weight) is _____. 2. oxygen silicon calcium iron 3. The central region of an atom is ...

### English

Instructions: Read the text and select all the sentences that speculate about the past. My answered are with capital letter YOU MUST HAVE WONDERED what life was really like in the past. If we had lived in the wild west, our lives COULD HAVE BEEN VERY EXCITING! Life was rougher...

### Geog

In one minute of time how far does the earth rotate in minutes or seconds of longitude? Please use the answer I posted in my last answer to calculate this answer.

### physics

a body is thrown vertically upward return to the earth in 3sec. (a)what was the initial velocity of the body (b)what height did the body reach? neglect the resistance of air.

### physics

rank the average gravitational force from greatest to least between (a) sun and mars (b)sun and moon (c) sun and earth include an explanation PLEASE!!!!

### Gr. 12 Physics

A pilot must fly his plane to a town which is 200km from his starting point in a direction 30degrees N of E. He must make the trip in 1/2 h. An 80km/h wind blows in a direction 30degrees E of S. Find the speed of the plane relative to air. I found the speed of the plane ...

### math

In the United States, personal income taxes are paid according to a specific scale. For example, individuals who earn a yearly salary between \$31,000 and \$31,150 must pay \$4229 in taxes. Individuals who earn a yearly salary between \$41,000 and \$41,150 must pay \$6381 in taxes...

### Sociology

For question #3, reference the videos "History of the Most Cajun Place on Earth"and “Music & Culture in the Most Cajun Place on Earth” A) Briefly describe the formation of the Cajun culture as an American subculture in the context of historical events and geographic ...

### Algebra 2

Two woodworkers, Tom and Carlos, bring in \$100 for making a table and \$80 for making a chair. On average, Tom must work 3 hours and Carlos 2 hours to make a chair. Tom must work 2 hours and Carlos 6 hours to make a table. If neither wishes to work more than 42 hours per week, ...

### math

Suppose that a crayon weighs the same as a marker. You have a box of crayons, 4 extra crayons, and 20 markers. Let b be the number of crayons in the box. A scale balances with all the crayons on one side and all the markers on the other. You remove markers from the scale so ...

### chemistry

During the combustion of 5.00g of octane C8H18, 239.5 kcal is released. Write a balanced equation for the combustion reaction. Are reactants or products favored? What is the sign of change of heat for this reaction? how much energy is released by the combustion of 1.53mol of ...

### physics

Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. Speaker B is 12 m to the right of speaker A. The frequency of the waves emitted by each speaker is 686 Hz. Sound velocity is 343 m/s. You are standing between the speakers, along ...

Hello, I had to answer to some questions on the this paragraph of 'The Cask of Amontillado' by Edgar Allen Poe. The paragraph: The thousand injuries of Fortunato I had borne as I best could, but when he ventured upon insult I vowed revenge. You, who so well know the nature of ...

### Linear Programming

Finco must determine how much investment and debtto undertake during the next year. Each dollar invested reduces the NPV of the company by 10¢, and each dollar of debt increases the NPV by 50¢ (due to deductibility of interest payments). Finco can invest at most \$1 ...

### physics # 5

5. The length of a simple pendulum with a period on Earth of one second is most nearly a.) 0.12 m b.) 0.25 m c.) 0.50 m d.) 1.0 m e.) 10.0 m The formula for the period is P = 2 pi sqrt(L/g) g is the acceleration of gravity, 9.8 m/s^2. Solve for L. (or get out a piece of string...

### Physics

What is the apparent weight of a 75 KG astronaut 4200 km from the center of the earth's moon in a space vehicle.a) moving at constant velocity, and b) accelerating toward the moon at 209 m/s? state the direction in eachcase

### language

I am trying to do a report on the following and can't find any sites that contain info to make report. Looking for various types of humans that have lived on earth since time began. thanks for any help

### Helth science

True or False: Laid end to end, the blood vessels in your body would circle the Earth two and a half times. 2. The _________ is made up of cardiac muscle.

Objects on the moon's surface have an acceleration due to gravity one-sixth that on the earth's. What would the 40 kg boy weigh on the moon? (Round answer to nearest tenth.)

### physics

light travels at a constant speed of 3x10^11 centimeters/sec. how long does it take light to reach the earth a distance of 1.5x10^8 kilometers give your answer in seconds and minutes.

### English

Which of the following publications are both listed under the "Magazines" results? A. Astronomy and Science B. Odyssey and Natural History C. Science News and Earth Island D. The Economist and American Scientist

### electric engineering

An aircraft has a wing span of 56 m. It is flying horizontally at a speed of 900 km/hr and the vertical component of earth’s magnetic field is 0.4 m Wb/m2. Calculate the P.D between the wing tips of the air craft

### AP PYHSICS

A projectile is fired from the surface of the Earth with a speed of 150 meters per second at an angle of 45 degrees above the horizontal. If the ground is level, what is the maximum height reached by the projectile?

### PHYSICS

A projectile is fired from the surface of the Earth with a speed of 150 meters per second at an angle of 45 degrees above the horizontal. If the ground is level, what is the maximum height reached by the projectile?

### physics

The loudest sound in Earth’s history is believed to be the explosion of the volcanic island of Krakatoa, back in 1883. Physicists estimate that the intensity of the sound produced was 1.0×107 W/m2. How many decibels does this correspond to?

### physics

Two cars, A and B, travel in the same direction on a straight section of highway. A has a speed of 69.5 km/h, and B a speed of 84.3 km/h (both relative to the earth). (b) If A is initially 394 m in front of B, how long will it take for B to reach A?

### Science/earth

How does money and politics affect the public claims about global warming? Pick on news source (news company, think tank, or university) and investigate its credibility.

### math

Find the distance btw two cities. Assume that the Earth is is a sphere of the radius 4000 miles and that the cities are the on the same longitude(one city is due north of the other).

### Math

A40m deep wellwith radius 3.5m is dug and the earth taken out is evenly spread to form a plat form ofdimensions 28mby 22m. find the height of the platform.

### Physics

A second's pendulum is taken on the surface of moon where acceleration due to gravity is 1/6th of that of earth.Will the time period of pendulum remain same or increase or decrease?Give a reason.

### Physics

A second's pendulum is taken on the surface of moon where acceleration due to gravity is 1/6th of that of earth.Will the time period of pendulum remain same or increase or decrease?Give a reason.

### Geography

1. When geographers group locations on Earth together because they all have at least o characteristic in common, which theme of geography are they applying? A.location****B.region C.human-environment interaction D.movement

### Earth's Dynamic Atmosphere

In global circulation, _______ move toward the equator and are deflected by the Coriolis effect. A. westerlies B. trade winds C. polar easterlies D. subtropic winds my answer is b.

### Math

Question: You are randomly dealt 5 cards from a standard deck of 52 playing cards. What is the probability that you have at least 4 cards of the same suit? My solution: 4 [ P(4 of the same suit) ] - because there are 4 different ways to get 4 of the same suit, Clubs, Hearts, ...

### PHYSIC

You are a member of an alpine rescue team and must project a box of supplies, with mass m, up an incline of constant slope angle α so that it reaches a stranded skier who is a vertical distance h above the bottom of the incline. The incline is slippery, but there is some ...

### Math

A cooperation must appoint a president, CEO, COO,and a CFO. It must also appoint a planning committee with 3 different members. There are 15 candidates and officers can also serve on the planning committee. How many different ways can the officers be appointed? How many ways ...

### Physics

How would I approach this problem? What formula would I use to answer each part? Thank you in advance for any guidance... As part of the launch of the space shuttle, solid-rocket boosters (SRBs) first take it to an altitude of 45.0 km while they accelerate it to a speed of ...

### Science

Why is the human population of the Earth still growing rapidly even though birth rates have begun to fall slightly? Due to better health and medical advancements, people are living longer.

### Science

I have read my article and still I am unsure of the correct answer. Which layer of the Earth contains liquid rock called magma? I think it is the core, but my mom thinks it is all three layers. Please Help

### english

what is being said in the following line:   “Foul devil, for God’s sake, hence, and trouble us not; For thou hast made the happy earth thy hell, Fill’s it with cursing cries and deep exclaims.”

### Biology

Some questions on a review that I have no idea! Describe what the earth looked like when it first formed? Why was the presence of oxygen so important keep in mind aerobic,anaerobic respiration and the amount of ATP produced?

### Earth Science

Divide the following list of words into 2 categories: drumlin, kettle lake, mafic, devonian, asthenosphere, gradient, fossil, topography, plateau, marlble For each category, give it a title (1-2 sentences)

### math

Scientists have calculated that the Moon's revolution around Earth is increasing by about .015 s per century. At this rate, how long would it take the length of a month to increase by one full day?

### SS

how did rachel carson affect the environment? A: she wrote a book that caused congress to ban a pesticide. B: she developed the technology that allow us to recycle. C: she started the celebration of earth day. D: she was the first director of the environmental protection agency

### AP WORLD HISTORY TEST TODAY!!!

Man is believed to have migrated from what region of the earth? A. southeast Asia B. Iberian Peninsula C. Fertile crescent D. Indo-Europe E. Mediterranean Basin I NEED A FAST RESPONSE!! THANK YOU

### Chemistry

I'm going crazy please help me out part 1 of 2 Determine the mass of anhydrous copper(II) sulfate that must be used to prepare 250 mL of 2.01 M CuSO4(aq). Which i found to be 80.204g part 2 of 2 Determine the mass of CuSO4.5H2O that must be used to prepare 250 mL of 2.01 M ...

### Physics

A weather balloon is floating at a constant height above Earth when it releases a pack of instruments. If the pack hits the ground with a velocity of -68.5 m/s, how far does the pack fall? a = -9.80 m/s^2 Vf = -68.5 m/s d = ?

### science

What if one type of rock was missing from the rock cycle. How would the absence of this rock affect the earth's crust and other geologic formation on our planet?

### science

during which phase is the least percentage of the light that hits the moon visible from earth? a) new moon b) waxing gibbous c) waning crescent d) full moon

### Calculus

A man has 340 yards of fencing for enclosing two separate fields, one of which is to be a rectangle twice as long as it is wide, and the other, a square. The square field must contain at least 100 square yards and the rectangular one must contain at least 800 yards. (a.) If X ...

### physics

a) How much work must be done on a particle with a mass of m to accelerate it from rest to a speed of 8.4×10−2 c ? (Express the answer in terms of mc^2.) b)How much work must be done on a particle with a mass of m to accelerate it from a speed of 0.900c to a speed 0.984...

### 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...

### English

1. No one is to solve the problem. 2. No one can solve the problem. ---------------- Does #1 mean #2? 3. I was never to see him again. 4. I was doomed never to see him again. -------------------------- Does #3 mean #4? 5. If you are to succeed, you must study hard. 6. If you ...

### physics

need help on this three part one its about inelastic collisions momentum and energy related with work Find the speed at which Superman (mass=76.0 kg) must fly into a train (mass = 17620 kg) traveling at 60.0 km/hr to stop it. Running into the train at that speed would severely...

### Art

Could you please check these sentences, too? Thank you very much. 1) The Waste Land is a complex long poem of 433 lines about a “waste land” which seems both personal and external. It is divided into five sections and is dedicated to Eliot’s friend and poet, Ezra Pound, ...

### Science

If you wanted to consult the geologic period for when the first vertebrates evolved, where would you look? a. in the section for the Ordovician period of the Paleozoic era. b. in the section for the Quaternary period of the Cenozoic era. c. in the section for the Triassic ...

### Science

If you wanted to consult the geologic period for when the first vertebrates evolved, where would you look? a. in the section for the Ordovician period of the Paleozoic era. b. in the section for the Quaternary period of the Cenozoic era. c. in the section for the Triassic ...

### Science

If you wanted to consult the geologic period for when the first vertebrates evolved, where would you look? a. in the section for the Ordovician period of the Paleozoic era. b. in the section for the Quaternary period of the Cenozoic era. c. in the section for the Triassic ...

### science

water from the earths surface moves in the air by ? and becomes ?. evaporation, and becomes water vapour in the earth's atmosphere

### earth science

What effects do convection currents have on the mantle and crust that would not happen if convection currents didn't exist?

### earth science

if you didn't know these cities were all cities of the United States, how could you tell from the temperature curves that they were all in the Northern Hemisphere?

### Physical Science

How much would 80.0 kg person weight (a) on Mars, where the acceleration of gravity is 3.93 m/s2, and (b) on Earth's Moon, where the acceleration of gravity is 4.63 m/s2?

### earth science

If an atom has 17 electrons and its mass number is 35, calculate the following: number of protons, atomic number, and number of neutrons.

### physics

A 4.0 kg object is lifted 1.5 m. (a) how much work is done against the earth's gravity ? (b) repeat if the object is lowered insteadof lifted

### science

Why does the sun and moon appear to be the same size when viewed from earth.My answer is because the sun is bigger than the moon. Am I correct

### Physics

Compute: a. The velocity of an object orbiting at height of 2 Re above the surface of Earth. b. Compute the orbital period of that object.

### Physics

The International Space Station is 370 km above the Earth's surface (Re = 6378 km, Me = 5.98 x 10^24 kg). What is the linear velocity of the space station in m/s

### Earth Science

Describe how weathering and erosion can be both destructive or constructive. I am still confused on the difference of erosion and weathering...

### Earth Science

16.   What type of instrument measures seismic waves?  A. Mercalli scale B. Seismic scale C. Seismogram D. Seismometer D?

### math

A person weighs 120pounds on earth weighs 20 pounds on the moon how much does a 90 pound persob weigh on the moon

### chemistry

The pressure of the earth's atmosphere at sea level is 14.7 lb/in2. What is the pressure when expressed in kg/m2? (2.54 cm = 1 in., 2.205 lb = 1 kg) 2.62×102 kg/m2 5.02×104 kg/m2 4.30×10-3 kg/m2 2.09×10-2 g/m2 1.03×104 kg/m2

### Astronomy

An astronomical unit can be thought of as... a 25 light years b 19 earth years c 93 million miles d 100 billion miles

### Physics

Does an apple exert a gravitational force on the earth? If so, how large a force? Consider an apple (a) Attached to a tree and (b) falling.

### Math

During the summer break, Allie works as many as 35 hours per week. On Saturdays she spends between two and six hours teaching adults to swim. On weekdays, she can work between 10 and 40 hours teaching swimming lessons at a children's camp. Teaching adults pay \$10 per hour ...

### science

What star other than the sun is closest to the earth? Proxima Centauri, which is part of the alpha Centauri three-star system