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

25,359 results, page 99

### Math

A family wants to travel at least 420 miles in 8 hours of driving. What must be their average rate of speed? What would be the inequality formula?

### Social Studies

I need to write a letter ( at least one paragragh) about applying for a job for Congress assistant. I must explain why Help

### physics

Imagine having an 80-turn coil with radius of 5.0 cm and resistance of 30 Ù. At what rate must a perpendicular magnetic field change to produce a current of 4.0 A?

### phisecs

A car must do work at a rate of 19 kW to maintain a constant speed of 29 m/s on flat ground. How large are the forces opposing its motion ? (In units of N)

### Chemistry

what mass of hydrogen must be reachted with excess nitrogen to produce 5000. J of energy based on the reaction: 3H2+N2--> 2NH4+2709J

### English help

I need help coming up with a personal response to the story "The Stealing Thors Hammer." I don't know how to put it. It must have as comment, interpretation, evaluation etc.

### science

after a rock layer is eroded, whick additional event must occur to create and unconformity, or a gap , in the geologic record

### Physics Dynamics

An arrow has an initial launch speed of 32 m/s. If it must strike a target 38 m away at the same elevation, what should be the projection angle?

### algebra

The product of the first ten prime numbers must be divisible by: F. 16 G. 18 H. 20 J. 22 K. 24 Please provide detailed explanation with answer (if possible) Thanks in advance.

### maths

Determine the stress in a solid steel rod of diameter 30 mm when subjected to a tensile load of 91 KN (your answer must be in MPa to 2 decimal places).

### writtig skills

Citation must be provided for A. well-known quotations. B. words and ideas borrowed from another author. C. common knowledge. D. familiar proverbs I choose B .

### Math

7. You are having a discussion about sequences with your classmate. She insists that the sequence 2, 3, 5, 8, 12 must be either arithmetic or geometric. Is she correct or incorrect? Explain.

### Snethezekile High School

Maths lit,History,Economics,Business Studies,Tourism Which careers must a person focuss on when doing these subjects?

### algebra

State any real numbers that must be excluded from the domain of the rational expression. Enter your answers in increasing order. 6p2/p2−49

### Math

You are having a discussion about sequences with your classmate. She insists that the sequence 2,3,5,8,12 must be either arithmetic or geometric. Is she correct or incorrect? Explain.

### physics

what minimum initial velocity must aprojectile have to reach atarget at a distance of 25m away?(use g=10m/s square)

### Chemistry

What mass of ammonium chloride must be decomposed to prepare 134 grams of ammonia (NH3). Hydrochloric acid will also be produced.

### english

Which type of faulty logic appears in this sentence? Dr. Bishop has never performed a surgery before, so he must not be equipped to be a good surgeon.

### Math

I am asked to graph a translated parabola,ok, that's pretty easy, but, then,it says that it must be dobe with a dilatation of 2, does that mean that my axis is going to be this way:2,4,6,8,10...??

### Chemistry

How many grams of NaN₃ must be decomposed to fill a 42.0 L airbag with nitrogen gas at a pressure of 1.05 atm and a temp of 29.5 degrees Celsius?

### Maths

Find the number of ways of forming an executive committee of 4 in a social club consisting of 15 members, if a particular man must be in the team

### Math

Right triangle ABC is reflected over AC, then dilated by a scale factor of . Which statements about the two triangles must be true?

### math

A tradesman allows a discount of 15% for cash payment.how much % above cp must he mark his goods to make a profit? (ans 20%) please help me

### Science

What quantity of Caco3 must be heated to give sufficient amount of Co2 to convert 10.6 gms of Na2Co3 completely into NaHCo3 ?

### Physics

How fast (in rpm) must a centrifuge rotate if a particle 69-cm from the axis of rotation is to experience an acceleration of 200438 g's? (can you show me how you get the answer) be thorough

### geography

I am confused. I am to list my full address and say what continent, hemispheres and planet is my address in!! New Orleans, La. Continent - North America. Hemisphere - Northern Hemisphere. Is this correct? Planet - Earth. Is this correct????

### Science-Space

Compare Earth and the moon in terms of size and surface gravity.Explain please. What is the relationship between the moon's surface gravity, lack of an atmosphere, and temperature range? Explain please!

### Physics

a ship is heading due north at 7.50 m/s relative to the water. The local current is 1.52 m/s in a direction 42 degree west of north. Find its velocity relative to earth( find both direction and magnitude of the velocity)

### Algebra

The distance from the Earth to the sun is 93,000,000 miles? Write this number in scientific notation. A scientist measures a speck of sand as having a diameter of 0.00000034? Write this number in scientific notation.

earth and the moon are kept in their respective orbits due to the influence of ? a) inertia b) gravity c) both inertia and gravity d) neither inertia and gravity Is it c) both inertia and gravity?

### Science/Astronomy

Large geomagnetic storms can cause surges of electric current here on Earth. What is the MOST LIKELY result of a large surge in electric current? F. power outages G.better TV reception H. cheaper electric power I. Local Group galaxy What is the answer???

### Science

Hello! I am having some trouble with this one question. I know that the Earth's gravitational force pulls the train towards the ground, but I do not know how the other forces act on the train. Any help is super appreciated:) Q: Explain how gravitational, electrical, and ...

### Physics

A truck travels 2.85 km north and then makes a 90° left turn and drives another 4.90 km. The whole trip takes 4.50 min. (a) With respect to a two-dimensional coordinate system on the surface of Earth such that the y-axis points north, what is the net displacement vector of ...

### Physics

A large pendulum with a 200-lb gold-plated bob 12 inches in diameter is on display in the lobby of the United Nations building. Assume that the pendulum has a length of 78.4 ft. It is used to show the rotation of the Earth - for this reason it is referred to as a Foucault ...

### Math

A projectile is shot upward from the earth with an initial velocity of 320 ft/sec. (a) What is the velocity after 5 secs.? ft/sec. (b) What is the acceleration after 3 secs.? ft/sec^2.

### SOCIAL STUDIES

What are the three forces that change the shape of the land and what are the effects do they have on the earth? http://en.wikipedia.org/wiki/Erosion

### physics

Calculate Earth's force of gravity on each of two steel balls of masses 6.0kg and 12.0kg I the forces of gravity on the 12-kg ball is greater than that on the other ball, why do the two balls accelerate at the same rate when dropped?

### college alg

The height of a projectile fired upward is given by the formula s = v0t − 16t2, where s is the height, v0 is the initial velocity, and t is the time. Find the time for a projectile to return to Earth if it has an initial velocity of 184 ft/s.

### physics

The length of a moving spaceship is 27.0 m according to an astronaut on the spaceship. If the spaceship is contracted by 14.5 cm according to an Earth observer, what is the speed of the spaceship? I know L=27m and delta L= 0.145 so our contracted length is 26.855 so what ...

### science

If the acceleration due to gravity on the earth is 9.8 , what is the acceleration due to gravity on Rams?

### physics

If the acceleration due to gravity on the earth is 9.8 m/s2, what is the acceleration due to gravity on Rams?

### Linear programming

Riverside Oil Company in eastern Kentucky produces regular and supreme gasoline. Each barrel of regular sells for \$21 and must have an octane rating of at least 90. Each barrel of supreme sells for \$25 and must have an octane rating of at least 97. Each of these types of ...

### Physics

A "dip needle" is a small magnet mounted on a horizontal axis so that it can swivel up or down. Where on Earth will a dip needle point most nearly verically? Where will it point most nearly horizontally?

### Earth Science

1A student measures the velocity of the water in a stream as 2.5 meters per second. The actual velocity of the water is 3.0 meters per second. What is the approximate percent deviation of the studentâ€™s measurements? (1)0.50% (2)17% (3)20% (4)50% Is it (2)?

### EArth Science to DAMONpl

If sea level has risen by 20 cm over the past century on the coast of North America,by how much do you think it has risen over the past century on the coast of India?Explain.

### Physics

If a 60 kg meteor falls to earth from a great distance. How much gravitational potential energy does it lose? (the energy PE is 0 at a great distance). What happens to this potential energy? Final-Initial=-Gmm/r-0=change in energy

### physics

a river flows due south with a speedof 2.0m/s.a man steers a motorboat across the river:his velocity relative to the river is 4.2m/s due east.the river is 800m wide.what is his velocity relative to the earth?

### Earth Science

5.   Most tornadoes carry wind speeds that range from  A. 105 to 177 km per hour. B. 178 to 266 km per hour. C. 267 to 322 km per hour. D. 1 to 105 km per hour. A?

### college alg.

The height of a projectile fired upward is given by the formula s = v0t − 16t2, where s is the height, v0 is the initial velocity, and t is the time. Find the time for a projectile to return to Earth if it has an initial velocity of 184 ft/s. ____________ s

### Earth Science - NEED HELP QUICK

What is the thickness of the layer from 1000 - 850 mb if the mean temperature of the layer is 2 C? From what it says in my textbook it seems as if mb = hPa so all you do is 850 - 1000 = -150 hPa but I am pretty sure that is wrong because what do you do with the temperature?? ...

### Math (matrices)

No one answered my matrix question. Let me rephrase: Let A, B, and 0 be 2x2 matrices. Assuming that A is invertible and 0 is all zeroes, what is the inverse of the matrix [A|0] [B|A] (that is a 4x4 matrix represented as 4 2x2 matrices) The answer is in the form: [A^-1|0 ] [C |...

### Math

1. A painter earns \$15 per hour. What is the minimum number of hours he must work to earn at least \$200? Write an inequality to represent this situation and solve. I THINK: So you know that he earns \$15 per hour so we can write that as 15h, h = # of hours worked We also know ...

### Physics (help steve)

Exact solutions for many-body problems are rarely encountered in physics. The following problem deals with a non-trivial motion of four charges. Due to the symmetry of the problem it is possible to determine the trajectories of the charges analytically. Four identical ...

### SCIENCE,PHYSICS

Exact solutions for many-body problems are rarely encountered in physics. The following problem deals with a non-trivial motion of four charges. Due to the symmetry of the problem it is possible to determine the trajectories of the charges analytically. Four identical ...

### Math

While Driving down a mountain, top finds that he has descended 1800 ft in elevation by the time he is 3.25 mi horizontally away from the top of the mountain. find the slope of his decent to the nearest hundredth. I am not sure where to start on this equation. I know that m = ...

### physics

A dip needle is a small magnet mounted on ahorizontal axis so that it can swivel up or down like a compass turned on it's side) where on earth will a dip needle point most nearly vertically? where will it point most nearly horizontally?

### Chemistry

We performed a lab in class about a month ago concerning different types of equilibrium. One particular portion of the lab adding 5 mL of .3M HCl to 5 mL of .3 M Pb(NO3)2. After a precipitate finally formed, 8 mL of water was added to dissolve PbCl2. One of my lab questions ...

### Earth Science

If sea level has risen by 20 cm over the past century on the coast of North America, by how much do you think it has risen over the past century on the coast of India? Explain.

### Earth Science

Describe the difference in evolution between a supercell that develops in an environment with unidirectional wind shear and a supercell that develops in an environment with veering winds. What is causing this difference in evolution? THANKS!!

### biology

the unique properties of water make life possible on earth, select three properties of water and: a) for each propery, identify and define the property and explain it in terms of the physical/chemical nature of water b) for each property,describe one example of how the ...

### Science

Please help me to solve this equation. Than you for your time and efforts. Here is the question? Jupiter at its closest approach to earth is about 630,000,000 kilometers, the diameter of Jupiter is 140,000 km, calculate the angular diameter of Jupiter in arc seconds. 206,265 ...

### Physics - Repost because of no response

In an experiment on the shuttle, an electron with a speed of 6.3 x 105 m/s [N] and a mass of 9.11 x 10-31 kg is shot through an external magnetic field. Determine the strength and orientation of the magnetic field required so that the electron's direction of travel remains ...

### Physics - Repost because of no response

In an experiment on the shuttle, an electron with a speed of 6.3 x 105 m/s [N] and a mass of 9.11 x 10-31 kg is shot through an external magnetic field. Determine the strength and orientation of the magnetic field required so that the electron's direction of travel remains ...

### Math

Hi everyone! I am extremely struggling with this questions and was hoping someone would go over them with me. Thank you! 1. Which of the following expressions is written in scientific notation? a. 73.4 x 10^5 b. 0.09 × 10^7 c. 80 x 10^3 d. 4.22 x 10^–3 2. Which of the ...

### AE.. is this right

In any given multicultural classroom, what are the concerns in terms of social justice for all students? How would you address these concerns? Describe a strategy you might use to ensure that all students are treated equally and fairly? Teachers must be open to their students ...

### physics

A homologous rod of mass M=20kg of length L=3m and of negligible cross-section rests initially on the horizontal ground chosen as a reference level for the gravitational potential energy. The rod is rotated about one end until it takes a vertical position . Calculate the ...

### basic math

I know the answer but i don't understand the borrowing of the 2in the thousands place why is it 11 and not 12... the problem is 612,014-323,440=288,574 http://mathforum.org/library/drmath/sets/select/dm_borrow.html Be sure to click on the various links to find the explanations...

### physics

A plane flying horizontally above Earth’s surface at 150. meters per second drops a crate. The crate strikes the ground 30.0 seconds later. What is the magnitude of the horizontal component of the crate’s velocity just before it strikes the ground? I know the answer is 150...

### physics

A helium balloon and its gondola, of mass M, are in the air and stationary with respect to the ground. A passenger, of mass m, then climbs out and slides down a rope with speed v, measured with respect to the balloon. With what speed (relative to Earth) does the balloon then ...

### Math

The land on Earth’s surface is represented by the seven continents. Europe has 77% of the dry land while Africa has 20%. North America has 4/25 and Antarctica has 1/10 of the dry land. What fractional amount of the dry land is contained within the three remaining continents...

### Math help

The land on Earth’s surface is represented by the seven continents. Europe has 77% of the dry land while Africa has 20%. North America has 4/25 and Antarctica has 1/10 of the dry land. What fractional amount of the dry land is contained within the three remaining continents...

### Math

A light pole of height 15 meter has a lamp hanging at its top . from a distance 12 meter from the base of the pole , a ball is thrown vertically upwards with velocity 5m/sec . find the rate at which the shadow of the ball on the earth moves away from the base of the pole after...

### Physics

a) Calculate the acceleration due to gravity on the planet Mars. I found this to be about 3.7 m/sec^2 b) What would your weight be on the planet Mars if you weighed 130 lbs? c) If you could jump vertically 5 ft on earth, how high would you be able to jump on mars? I'm just ...

### SCIENE ASAP

Hello! I am having some trouble with this one question. I know that the Earth's gravitational force pulls the train towards the ground, but I do not know how the other forces act on the train. Any help is super appreciated:) Q: Explain how gravitational, electrical, and ...

### science

This is for a bonus if we want to answer it. Can you see if it is correct? State in one sentence the most significant discovery that geologists established through their study of plate tectonics. Here goes- The most significant discovery is that the Earth's plates are moving. ...

### Science Earth

Label the year and name of each geologic area on your geologic time scale. Using the 1 cm = 10 million years scale, figure out and measure each distance below from the PRESENT line. Pre-Cambrian Era = 4.6 Billion years ago = _______________________ cm from PRESENT What would ...

### math

p=14.63⋅0.8 Atmospheric pressure, measured in pounds per square inch p, s, i is the force exerted by Earth's atmosphere over a given area. The atmospheric pressure, p, exerted on an airplane flying at an altitude of a miles above sea level can be approximated by the model ...

### physics

Considering the factors that affect gravitational pull, in which location would the gravitational pull from the earth be SMALLEST on you? A) visiting friends at the beach B) visiting Santa on the second floor of the mall C) visiting Uncle Chrissy in the Himalayan Mountains D) ...

### physics

A ball of mass 0.075 kg is fired horizontally into a ballistic pendulum. The pendulum mass is 0.350 kg. The ball is caught in the pendulum, and the centerof mass of the system rises a vertical distance of 0.145 m in the earth's gravitational field. What was the original speed ...

### Scholastic Arts and Writing Awards

Fee Waiver Statment: A teacher or administrator must submit a letter on school letterhead listing the student or students who qualify for a fee waiver. The letter must be signed by the teacher or administrator and included with the submission form in lieu of the check. Fee ...

### science

THE WOOLY WORM HUNT is an exciting "game" where the students are the Predators, hunting the great (and desirable) wooly worm. The class is given 60 seconds to pick up as many colored wooly worms as possible from the 1400 worms scattered across the Prep's front lawn. The 14 ...

### English

1. Which of the following would not be a good strategy for delivering a speech? Make sure your presentation equipment is running properly. *Start talking over the audience to quiet them down. Use correct grammar and well-formed sentences. Look directly at the members of your ...

### english

I'm trying to study satire. I found this poem online Now if you take an orange And hold it in your hand, It isn't really there at all - Or so I understand. A sensationalist will prove to you That though you know it's there, It's only just sensations Of which you are aware. ...

### Math

A 120Ib person would weight about 20Ib on the earth's moon. A 150 Ib person would weight 28I Ib on lo, a moon of Jupiter. Use ratio table to determine which make a person weight the most

### science

why do we find the major land biomes at specific locations on the earth in both the northern and the southern hemispheres? Variations in climate determine the biomes. These variations are determined by the frequency and direction of winds and ocean currents, along with ...

### science

Please help me with these questions I have looked all threw my book but i cant find them. 7. Why are we not sure about the interior of the earth? Do we know for sure why? 12. Some volcanoes are more explosive than others? What makes this diffrence in explosivity occur? 14.What...

### earth science

Why are some crystals large and perfect, while others are small and irregular? The only answer in my book that seems close is : The crystal shape, hardness, cleavage and density of a mineral are determined by the internal arrangement of its atoms or ions. I don't see anything ...

### physics

two llong parallel vertical wires 0.3m apart are placed east-west of one another.The current in the eastely one is 30A and that in the other is 20A.Both currents flow upwards.The earth"smagnetic field is horizontal directed north and has magnetude field B=20x10^-6T.Calculate ...

### Physics

I can not figure this out. You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 2.070E+7 m and its rotation to be 19.8 hours. You have previously determined that the planet orbits 1.590E+11 m from its ...

Convection cells are created by very hot material deep in the mantle rising, then cooling, sinking again and repeating the cycle. This process occurs because of the uneven distribution of ? Within the earth? Please fill in the question mark with a answer. a. Crystal plates B. ...

### Geology

Scientists debate about the use of fossils as a tool to determine records of various events, such as the vanishing of the dinosaurs or the origin of our ancestors. Based on what you know of fossils from your textbook and other sources, discuss the role of fossils in helping ...

### Physics

Can someone walk me through how to work this? It's worded weirdly and I'm not sure how to solve it. Mass M1= 2.2 kg lies on a frictionless table, pulled by another mass M2= 4.1 kg under the in of Earth's gravity. a) What is in N the net force acting on the system of both ...

### accounting

Can anyone help me with this? Guard Dog Company recently changed its system of internal control over cash disbursements. The system includes the following features. Instead of being unnumbered and manually prepared, all checks must now be prenumbered and written by using the ...

### accounting

Guard Dog Company recently changed its system of internal control over cash disbursements. The system includes the following features. Instead of being unnumbered and manually prepared, all checks must now be prenumbered and written by using the new checkwriter purchased by ...

### science

scientists often use models to study the movement of earth and it's moon. Why do they use models to study the movements? please help pretty pretty please with cherry on top!

### Physics

The earths mass is m=5.98*10^24 kg and physics students masss is 70 kg. Knowing that the gravitational force between the student and the earth is 392 N of force, what is the distance between the student and the Earths center?

### Physics

A pendulum on earth swings with angular frequency ω. On an unknown planet, it swings with angular frequency ω /2. The acceleration due to gravity on this planet is A) 4g B) 2g C) g/2 D) g/4 I think it is C but I am not sure...

### s.s (social studies)

can you help me translate the declaration of independence? first passage: When in the course of human events it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume among the powers of the earth, the separate ...

### Earth Science

Which of the following is true: -Relative dating tells us how long ago something existed -Disconformities are less common but usually far more conspicuous because the strata on either side are essentially -Estimates indicate that the North American continent is being lowered ...