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

25,359 results, page 36

### Physics

Which two factors mainly affect ocean tides on Earth? Check two answers. Earth's revolution about both the Moon and the Sun the Moon the Sun the pull of distant planets

### check geo.

what are ice ages? A)periods of time glaciers receded to cover only the poles. B)eras during which earths orbit kept the planet far from the sun. C)periods of time when glaciers covered much of the earth. D)times when human and animal life thrived in high latitudes. .I chose ...

### check geo.

what are ice ages? A)periods of time glaciers receded to cover only the poles. B)eras during which earths orbit kept the planet far from the sun. C)periods of time when glaciers covered much of the earth. D)times when human and animal life thrived in high latitudes. .I chose ...

### i really need help with science pls help

The Hawaiian Islands are examples of islands that formed over a hotspot. Based on this information, which of the following processes formed the Hawaiian Islands? Melted rock called magma rose through holes in Earth's crust and gradually solidified as it cooled. Tectonic ...

### physics

1. the average distance separating the Earth and the Moon is 384 000 km. Use the data table 7.3 to find the net gravitational force the eath and the moon exerts on a 3.00*10^4-kg spaceship located halfway between them. TABLE 7.3 <--- for the moon and the earth Body

### Trigonometry

Two planes are flying at the height of 10-km. They are going at the same speed, and both traveling due north. If the planes are 3,000 km apart as measured along the surface of the earth, what angle do the lines from the planes make to the center of the Earth make?

### Physics

I'm not sure how to go about solving this problem the algebra gets very messy... At what distance formt he EArth will a spacecraft on the way to the Moon experiance zero net force due to there two bodies because the Earth and Moon pull with equal and opposite force? THANKS

### Science help.....

Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time period not really considered a partof Earth’s ...

### Physics

A mass of 5Kg is 1st weighed on a balance at the top of a tower 20m high.The man is then suspended from a fine wire 20m long and reweivhed.find the difference in a weight ,assuming that the radius of the earth is 6400km,the mass of the earth is 6×10^24kg and G=6.673×-11 Nm^2...

### Science

Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA)What was this particular time period called? Why is this time period not really considered a part of Earth’s geologic history?

### science

Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time period not really considered a part of Earth’s ...

### Physics

What astronomical event would be seen by observers on the Moon at the time the Earth experiences a lunar eclipse? At the time the Earth experiences a solar eclipse?

### Physics

Light from the Sun reaches Earth in 8.3 min. The speed of light is 3.00 x 10^8 m/s. How far is Earth from the Sun? GIVEN: t = 8.3 min V = 3.00 x 10^8 m/s --> Would acceleration be 9.81 m/s^2? Is it this equation d = Vit + 1/2 a t^2

### chemistry

Radio waves travel at the speed of light which is 3.00 x 108 m/s. How many minutes does it take for a radio message to reach Earth from Saturn if Saturn is 7.9 x 108 km from Earth?

### Earth and Environmental Science

How much does the amplitude of the waves increase between an earthquake that measures 4.2 on the Richter scale and an earth quake that measures 6.2 on the Richter scale?

### physics

How do I calculate the radial acceleration in g's? For example: Calculate the radial acceleration (in g’s) of an object on the ground at the earth's equator, turning with the planet. Earth's radius is 6380 km.

### Algebra

Your weigh on the moon is about 1/6 of your weigh on earth. Write and solve an equation to show how much a person weighs on earth if he weighs 16 lbs. on the moon .

### physics

the acceleration of free fall on the moon is one sixth of that on earth. what would be the period on the moon of a simple pendulum which has a period of one second on the earth?

### English

1. Students on Earth may also play soccer with students who live on Mars. 2. The students on Earth may also play soccer with the students who live on Mars. [Are both okay? Do they have the same meaning? Does 'the students on Earth' mean 'all the students on Earth'? Does 'the ...

### Science

1. Which type of weather technology often carries cameras that can make images of Earth's surface, clouds, and snow cover? A. weather balloon B. weather satellite**** C. computer D. automated weather station 2. Why are weather forecasts more reliable now compared to hundreds ...

### English

1. We will lead your children to the joys of reading. 2. We will lead your children to the joy of reading. 3. We will lead your children to joy of reading. (Which expressions are grammatical? Are both acceptable?) 4. I learn many things in class from her kind teaching. 5. I ...

### 6th grade science PLEASE HELP DOING THIS RIGHT NOW

why are capillaries and not arteries or viens not found in alveoli,nephrones,and villi A.vessels must be small so that very little blood enters these tissues B.vessle must be narrow so that very smal moluculescan reach these tissues C.vessls must be light wieght so that way ...

### astronomy

The only important historical solar system object which has not yet been visited up close by satellite spacecraft is.. A) a comet or asteroid b) pluto c) neptune d) saturn's moon titan

### science

why does the sun appear to move westward across the sky during the day? a) because earth rotates to the east b) because earth rotates to the west c) because the sun moves in a westerly direction d) because of the way you are looking into the sky

### science

why does the sun appear to move westward across the sky during the day? a) because earth rotates to the east b) because earth rotates to the west c) because the sun moves in a westerly direction d) because of the way you are looking into the sky

### Earth science

I would like to comfirm that the 4 cycles on Earth are: carbon, water and rock. I think the 4th one is the biosphere but am not sure as the biosphere contains all attributes necessary (including the atmosphere)for life to exist. Am I on the track? I do understand that the ...

### Physics

In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 151 N/C downward at an altitude of 280 m and 167 N/C downward at an altitude of 430 m. Calculate the volume charge density of the atmosphere, assuming it to be ...

### PHYSICS

In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 151 N/C downward at an altitude of 280 m and 167 N/C downward at an altitude of 430 m. Calculate the volume charge density of the atmosphere, assuming it to be ...

### 7th Grade Math

The weight of an object on the moon varies directly as the weight of the object on Earth.A 90-pound object on Earth weights 15 pounds on the moon.if an object weights 156 pounds on Earth, how much does it weights on the moon? A.23 pounds B.26 pounds C.28 pounds D.936 pounds

### science

According to Kepler's law of harmonies, which of these planets takes the longest to orbit the Sun? mars jupitor venus neptune

### science

According to Kepler's law of harmonies, which of these planets takes the longest to orbit the Sun? mars jupitor venus neptune

### physics

Show that the critical velocity of body revolving in cercular orbit very close to the surface of a planet of radiuis R and meandencity.

### earth, science

Which of the following statements describes the development of the geologic time scale? A) Scientists developed the geologic time scale using fossilized remains from Europe and Asia. B) Scientists developed the geologic time scale by studying rock layers and index fossils ...

### Math

Find the Due date and maturity value for a $28,400 loan made to Henry Koolio on March 12 for 6 months at 9% interest. a. A total of $29,678 must be repaid on September 12. b. total of $29,678 must be repaid on October 12. c. A total of $1,278 must be repaid on September 12. d...

### Science

Planets shine by reflected sunlight. How can planets be brighter than stars? Approxinmately how many times brighter than Mars is Earth's full moon? (i do know the Moon's apparent magnitude equals -12.6) Could we see the sun if it were 32.6 light years from Earth?

### physics

A. how long will it take for a 55.0 kg steel brick to fall 75 meters on earth. A. how far from the base will a 55.o kg steel brick to land,(horizontally) if it dropped a vertical distance of 75 meters on earth, and what is its velocity just before it hits the ground?

### Physics

A 8.6-kg rock and a 5.9 × 10-4-kg pebble are held near the surface of the earth. (a) Determine the magnitude of the gravitational force exerted on each by the earth. (b) Calculate the magnitude of the acceleration of each object when released. For b), would the accelerations ...

### Physics

You have landed on an unknown planet, Newtonia, and want to know what objects will weigh there. You find that when a certain tool is pushed on a frictionless horizontal surface by a 12.2 N force, it moves 16.3 m in the first 2.30 s, starting from rest. You next observe that if...

### Physics

Calculate the position of the center of mass of the following pairs of objects. Use a coordinate system where the origin is at the center of the more massive object. Give your answer not in meters but as a fraction of the radius as requested. Get data from inside the front ...

### math

People weigh 6 times as much on Earth as they do on the moon.Mr.Marks weighs 180 pounds on Earth.How much would he weigh on the moon?

### physics

on the surface of earth, a spacecraft has a mass of 2.00x10^4 kilograms. What is the mass of the spacecraft at a distance of one earth radius above earths surface?

### Physics

The acceleration of gravity at the surface of the moon is approximately 1/6 that at the surface of the Earth (9.8m/s). What is the weight of an astronaut standing on the moon whose weight on Earth is 180lbs?

### math

Asia is about 3 times the size of antarctica together the 2 continents make up 2/5 of earth's land . what fraction of earth's land does antarctica make up?

### Physics Problem 6.20

The center of a 1.10 diameter spherical pocket of oil is 1.10 beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 8.0*10^2kg/m^3. Δg/g = ? %

### Physics

The center of a 1.50 diameter spherical pocket of oil is 1.20 beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 800 kg/m^3. Solve for delta g/ g = %

### Physics

The center of a 1.50 diameter spherical pocket of oil is 1.20 beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 800 kg/m^3. Solve for delta g/ g = %

### physics

Show that if a satellite orbits very near the surface of a planet with period T, the density (mass per unit volume) of the planet is p(rho)=3pi/(GT)^2

### political science

An important reason for why public policy and public opinion may not coincide in the United States is that... a) the American system of government includes arrangements, such as an appointed judiciary, which may produce policy decisions that run contraty to prevailing popular ...

### Phys Science

Good afternoon tutors..I need help on a few problems.Im really stuck.. 1) the space shuttle orbits at an altitude of approximately 200km above the surface of the earth. If the radius of the earth itself is 6380km, whats the acceleration de to gravity at the altitude of the ...

### physics

You are explaining to a friend why the crew of the International Space Station feels weightless while orbiting the Earth. Your friend responds that he thought gravity was just a lot weaker up there. Show that it isn’t so by calculating the acceleration due to gravity 350 km ...

### physics

1. It has been suggested that rotating cylinders about 11 mi long and 5.2 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth? 2. If ...

### astronomy

1. The radius of the Sun is 7 X 10^5 kilometers. Use powers of ten to show that the Sun's radius is about 100 times the Earth's radius. 2. Given that an astronomical unit is 1.5 X 10^8 kilometers and a light-year is about 10^13 kilometers, how many AU are in a light-year? 1 x ...

### Geometry

Imagine that all the people on Earth could stand side by side together. How much area would be needed? Would all the people on earth fit in Rhode Island? Explain your reasoning. Rhode Island, the smallest state in terms of area, has a land area of 1000 square miles. Assume ...

### Science..physics

The moon is the Earth's nearest neighbour in space. The radius of the moon is approximately one quarter of the Earth's radius, and its mass is one eightieth of the Earth's mass. a) Culculate the weight of a man with a mass of 80kg on the surface of the moon. b) Culculate the ...

### Physics

I have a hard time solving this problem. The weight of an object at the surface of a planet is proportional to the planet's mass and inversely proportional to the square of the radius of the planet. Jupiter's radius is 11 times Earth's and its mass is 320 times Earth's. An ...

### physics

The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 3.5 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X? Answer in units of s.

### physics

The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 4.6 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X? Answer in units of s

### Maths

The earth is approximately a sphere of average diameter 12740km. The smallest of the planets is Mercury, also spherical, with average diameter 4840km. Determine what percentages (to the nearest hundredth) the volume and surface area of Mercury are of those of the Earth.

### earth

The global-mean surface temperature of the earth is about 288 degrees Kelvin. Use the Stefan-Boltzman law to calculate the radiative flux corresponding to an object with this temperature. [hint: use σT4 with σ = 5.67x10-8 Wm-2K-4 ]

### Physics

If a small planet were discovered whose orbital period was twice that of Earth, how many times farther from the Sun would this planet be? The answer for this one is 1.6 earth radii, but I can't seems to get solution to find the answer. I would appreciate for any hint or help.

### Pre-Calc

The Greek mathematician Eratosthenes (ca. 276-195 B.C.) measured the circumference of the earth from the following observations. He noticed that on a certain day the sun shone directly down a deep well in Syene (modern Aswan). At the same time in Alexandria, 500 miles north (...

### chemistry

Teacher gave us homework that I really don't understand. We must write chemical reactions by which we differentiate alcohols, esters, hydrogenic carbon,carboxylic acid and halogen alkanes from each other. We must not write the same reaction for two different compounds and we ...

### science

Teacher gave us homework that I really don't understand. We must write chemical reactions by which we differentiate alcohols, esters, hydrogenic carbon,carboxylic acid and halogen alkanes from each other. We must not write the same reaction for two different compounds and we ...

### chemistry

according to the law of conservation of mass, if the products of a reaction have a mass of 64.0g, then the total mass of the reactants a. must be less than 64.0g b. must be equal to 64.0g c. must be more than 64.0g d. is not related to the mass of the products

### Physics

.) Beth launches a rocket out in the courtyard. It stays in the air for 7.25 seconds before coming back down. a.) How high did it get? b.) With what velocity did it hit the ground upon returning to Earth? c.) What is its rate of acceleration as it slows down, reaches the peak ...

### Physics

Left over from the big-bang beginning of the universe, tiny black holes might still wander through the universe. If one with a mass of 3.5 1011 kg (and a radius of only 1.0 10-14 m) reached Earth, at what distance from your head would its gravitational pull on you match that ...

### science

Why did the following change occur ? The snow that covered the ground all winter began to melt,temperature rose, and flowers started to bloom. a) days became shorter b) earth's tilt on its axis shifted. c) the sun's rays became more concentrated d) Earth completed one revolution

### Physics

How far above the surface of the Earth does an object have to be in order for it to have a weight which is 0.53 times the same weight as it would have on the surface of the Moon? (Ignore any effects from the Earth's gravity for the object on the Moon's surface or from the Moon...

### Physics

Supposed a skydiver ( mass=75kg ) is falling toward the earth. When the skydiver is 100m above the earth he is moving at 60m/s. At this point calculate the skydiver: Gravitational potential energy Kinetic energy Total mechanical energy

### math

The Position of two A and B on the earth’s surface are (36°N, 49°E) and (360°N, 131°W ) respectively. (a) The difference in long between town A and town (b) Given that the radius of the earth is 6370, calculate the distance town A and town B. (c) Another town, C is 840 ...

### Physics

A 54100 kg space ship has completed two thirds of its journey from the earth to the Moon. At this position, what magnitude force would the ship's engines have to supply to be the equilibrant? Assume the mass of the moon is 7.35E + 22 kg and the distance between the earth and ...

### physics

The center of a 1.00km diameter spherical pocket of oil is 1.00kkm beneath the Earth's surface. Estimate by what percentage g directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 8.0*10^2kg/m^3. Δg/g = ? %

### Physics

The orbital period of the moon about the earth is approximately 27.3 days. given that the average earth-moon distance is 384,000 kilometers, predict the moon's speed using the expression for centripetal force and the gravitational force, setting them equal to each other.

### science

The moon is the earth's nearest neighbor in space the radius of the moon is approximately one quarter of the earth's radius and it's mass is one eightieth of the earth's mass.(a)calculate the weight of an object with a mass of 50.0kg on the surface of the moon.(b)calculate the...

### Physics

A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you

### physics help!!!

A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you

### physics help!!

A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you

### Physics

A body of mass 20kg is transferred from earth (grams=weight newton kg) to another planet where G=2 Newton kg, 1.Wat is the mass on earth? 2.wat is the wieght on earth? 3.wat is the mass on the other planet? 4.wat is the weight on the other planet?

### math

A body of mass 20kg is transferred from earth (grams=weight newton kg) to another planet where G=2 Newton kg, 1.Wat is the mass on earth? 2.wat is the wieght on earth? 3.wat is the mass on the other planet? 4.wat is the weight on the other planet?

### Physics

A body of mass 20kg is transferred from earth (grams=weight newton kg) to another planet where G=2 Newton kg, 1.Wat is the mass on earth? 2.wat is the wieght on earth? 3.wat is the mass on the other planet? 4.wat is the weight on the other planet?

### main ideas

Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. A greenhouse used for plants stays warm because sunlight and heat coming through the glass roof are mostly trapped. The heat doesn't radiate back into the atmosphere because it'...

### earth

how would eath's gravity effect you in space??? At what altitude does the Earth's gravity no longer have an effect on the astronauts or the space shuttle???

### science

The gravitational pull on Jupiter is 2.5 times greater than Earth's gravitational pull. If an object weighs 10 pounds on Earth, what will it weigh on Jupiter?

### Physics

Mars has a radius of about 0.53 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.

### physics

Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.

### physics

Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.'

### physics

A 4.92E+2 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.81E+4 J of work on the balloon in the process. At what height above the surface of the earth does the balloon have a speed of 7....

### Precalculus

A nautical mile equals the length of arc subtended by a central angle of 1 minute on a great circle on the surface of Earth. If the radius of Earth is taken as 3960 miles, express 1 nautical mile in terms of ordinary, or statute, miles.

### physics

If you weigh 650 N on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter of 15.0 km ? Take the mass of the sun to be ms = 1.99×10^30 kg, the gravitational constant to be G = 6.67×10^−11 Nxm^2/kg^2 , ...

### college physics

Although astronauts appear weightless, they are not. They only appear weightless because they are in free fall. If a 79 kg astronaut is orbiting Earth with an orbital radius of 5.31×107 m, determine how much the astronaut would weigh. Earth's mass is 5.974 1024 kg.

### Physics

A skydiver is jumping from an airplane traveling at 10.0 m/s. The plane is 3520 m above the earth. The sky diver pulls his cord at 1760 m above the earth. Neglecting air resistance, how far does the skydiver travel horizontally before pulling the cord?

### Science

The rock cycle suggests that A)rocks are always added to Earth's mass. B)rocks are continuously being recycled into different forms. C)rocks disappear from Earth as they go underground. D)rocks always stay in the same form. My answer is A... is that right??

### earth science

briefly explain how earths atmosphere heated? Energy is transferred between the earth's surface and the atmosphere via conduction, convection, and radiation. Conduction is the process by which heat energy is transmitted through contact with neighboring molecules

### physics

Determine the force per meter on a lightning bolt at the equator that carries 20 000 A and is perpendicular to the Earth’s magnetic field, 3x10-5 T. What is the direction of the force if the current is straight up and the Earth’s field direction is due north which is ...

### physics

Determine the force per meter on a lightning bolt at the equator that carries 20 000 A and is perpendicular to the Earth’s magnetic field, 3x10-5 T. What is the direction of the force if the current is straight up and the Earth’s field direction is due north which is ...

### physics

Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do not neglect ...

### phys

The space shuttle, with an initial mass M = 2.41E+6 kg, is launched from the surface of the earth with an initial net acceleration a = 26.1 m/s2. The rate of fuel consumption is R = 6.90E+3 kg/s. The shuttle reaches outer space with a velocity of vo = 4632 m/s, and a mass of ...

### science- geology

I have to draw a topographical map on poster board of an imaginary island. It must have 2 mountains, 12 MI apart, one with a benchmark of 1510 ft and the other of 1075 ft. We must include 2 streams, one that flows down the larger lake into the ocean, the other must flow in and...

### algebra with finance

A video game has been developed whereby the player must earn a certain number of experience points before progressing to the next level. On level 1, a player must earn 1 experience point. On level 2, a player must earn 4 experience points. On level 3, a player must earn 8 ...