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

24,970 results, page 70

Technology

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

Geography

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

Mr. James- Science-again

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

Physics

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

Earth Science

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

phyics-universal gravity

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

ap enviromental

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

physics

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

Physics: How much do you way on another planet

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

earth science

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

earth science

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

Science

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

physics

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

Earth science

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

algebra

If a pine cone is projected upward at a velocity of 16ft/sec from the top of a 96-foot pine tree, then how long does it take to reach the earth?

Mechanics:Statics

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

Optics

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

Math

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

phys

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

physics

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

Physics

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

physics

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

Science

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

Science

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

Biology ASAP

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

AP physics

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

Dynamics

A level fight bomber flying at 300 ft/s releases a bomb at an elevation of 6400 ft. Approximately how long before the bomb strikes the earth?

Chemistry

How would I figure out how far the distance in kilometers between the sun and earth be if it takes 8.3 minutes for light to travel? (Light travels at 3.00 x 10^8)

Chemistry

When an electron makes a transition from the n=3 to the n=2 hydrogen atom bohr orbit, the energy difference between these two orbits (3.0x10^-19 J) is given off in a photon of light. The relationship ... between the energy of a photon and its wavelength is given by E=hc/...

Physics

For the normal force exerted on the book by the wedge in the diagram, which force(s) complete(s) the force pair for Newton’s third law (action-reaction)? 1) the sum of the component of gravity perpendicular to the surface of the incline and the component of Fhand ...

Math

wut iz, 10+10+4=4x x=? do what the equation tells you 1)add 10+10+4 2)since in the other side of the eqaution you have 4x, in order to leave the X alone you must divide by 4 on both sides and you will get______ that is the value of X. 4)in order to make sure take the value of ...

Philosophy

Is it more common for people to make decisions regarding religion on the basis of reason or by faith? I believe faith determines religious decisions. I think that depends on the person. Many people make decisions on religion based on both reason and faith. Guru is right. ...

Math

Joe's electric made 16 customer calls last week and 22 calls this week. How many calls must be made next week in order to maintain an average of at least 21 calls for the three week period? My answer was at least 19 calls must be made to maintain an average of 21 calls is this...

science

ok earth science what is a solstice and why do we have them?

physics

I know this has been posted many times but I keep trying and cannot get the right answer, A place kicker must kick a football from a point 39.9 m from a goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked the ball leaves the ...

physics

I know this has been posted many times but I keep trying and cannot get the right answer, A place kicker must kick a football from a point 39.9 m from a goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked the ball leaves the ...

Writing this equation

how do I write the equation of a line perpendicular to the line 6x – 3y=10 and containing the point (-6, 2). The line you are given can have its equation rewritten im y = mx + b as: y = 2x - 10/3 That tells you that is slope is m = 2. A line that is perpendicular to that ...

Business

I am trying to write a 1500 words review of two articles that are discussing ethical perspectives or business ethics for two countries. Each article must contain info. on a different foreign country on a different continent; for example, if the first article you select ...

government

Im confused, i think it is c or d. Why are civil liberties considered negative rights? A. Because citizens must act to protect rights. B. Because the government must act to protect rights. C. Because rights are protected by limiting citizen action D. Because rights are ...

Human Growth

Mary Lou must complete a research project to get her associate degree. She has just one year left to finish her degree and must spend as little time and money as possible on her research. She plans to compare stress levels of 8th graders to stress levels of 9th graders. What ...

English

1. I feel painful in the stomach. 1-1. I feel painful on the stomach. (Which one is correct?) 2. The first seed was bigger than the second seed at first. However it was afraid of the cold. So it didn't try to go out. It waited for warm weather. However, the second seed wanted ...

Geography (Europe)

I'm doing a project in Social Studies about the "new" products in Europe that include: Compass Porcelain Silk Cloth Gunpowder Spices Tea In order to receive full credit, I must include: Name of item Slogan for item How it changed life in Europe And I must do this for each. I ...

math

Business and Economics: For a business to make a profit it is clear that revenue R must be greater than cost C; in short, a profit will result only if R>C. if a company manufactures records and its cost equation for a week is C = 300 + 1.5x and its revenue equation is R = ...

MOMENTUM AND SHM

A(n) 3800 kg rocket traveling at 2500 m/s is moving freely through space on a journey to the moon. The ground controllers find that the rocket has drifted off course and that it must change direction by 9.2 degrees if it is to hit the moon. By radio control the ...

PHYSICS MOMENTUM

A(n) 3800 kg rocket traveling at 2500 m/s is moving freely through space on a journey to the moon. The ground controllers find that the rocket has drifted off course and that it must change direction by 9.2 degrees if it is to hit the moon. By radio control the rocket’...

5TH GRADE SCIENCE

Hey everyone I need some omework jelp as you can see.I'm not that well in Science so could you give me some tips? And i would like somr homework help for the following passge and answers. DIRECTIONS Read the paragraph and answer the questions. You can find examples of the ...

enviromental science

what is in a region of long-term atmospheric conditions Sulfur dioxide in the upper atomsphere cand lead to the formation of what that reduce the amount of sunlight reaching the surface of Earth

physics

If Earth shrinks in size such that its shape and mass remain the same, but the radius decreases to 0.21 times its original value, find the acceleration due to gravity on its surface. (6378.1/0.21)(9.80) = 2.97 m/s^2

Earth Science

A measurement is best defined as (1)an inference made by using the human senses (2)direct comparison to a known standard (3)an interpretation based on theory (4)a group of inferred properties (2), right?

physics

Use the period of the earth (2.34 y), its mean orbital radius (1.496 × 1011 m), and the universal gravitational constant (6.673 × 10−11 N · m2/kg2) to calculate the mass of sun. Answer in units of kg.

Incorrect comma usage?-

This begins with the titan Cronos’ mother, Earth, who encourages her children to overthrow their father, Heaven, because out of dislike, he keeps them locked away. does this look right?

diffirential calculus

two points are moving horizontally in space at different heights above the earth. show that the angle of elevation of the line joining them is greater when the distance between them is least.

earth

Why does western North America have volcanoes, earthquakes, mountain ranges, and small valley glaceiers and why are these same features not present on the eastern part of the continent? How could this situation be reversed?

Science

What best explains why carbon is present in so many kinds of molecules? A- It is abundant on earth B- It can form four covalent bonds C- It has valence electrons D- It can become ion I think it is B, however, I am unsure!

Earth Science

Use angular momentum arguments to describe why a parcel of air moving from the equator towards the North Pole will be deflected to the east. It may be helpful to show equations in your response.

Earth Science

Use angular momentum arguments to describe why a parcel of air moving from the equator towards the North Pole will be deflected to the east. It may be helpful to show equations in your response. THANKS

Trig

mercury rotates around the sun in approx. 89 earth days (or 7,689,600 s. use a calculator to approximate its angular speed. choices: 4.09x10^-7 0.035 0.071 8.17x10^-7

Grammar (Writeacher)

Revise the sentences below in which "who" or "whom" is used incorrectly. Then, indicate how "who" or "whom" is used in each sentence. 1. To play Kick the Can, the group must make a decision about whom will be counting. 2. Everyone else must hide from the person who is counting...

Probability

You are the owner of an auto repair service. History tells you it takes on average 45 minutes to complete a repair job. You have determined the standard deviation for a job is 6 minutes. A women comes into your shop and tells you she must leave her car for repair, and that she...

Science Earths Evolution

Tell me what you think plz 1.The Reason why it was not a solid planet yet is because Rocks or asteroids were still being formed. All there was were Dust and Tiny Particles were forming the asteroids. This was probably in the Hadean Era Because it was long ago, That’s ...

Math

When doctors prescribe medicine, they must consider how much the drug’s effectiveness will decrease as time passes. If each hour a drug is 20% less effective as the previous hour, at some point the patient will not be receiving enough medicine and must be given another dose...

Acoustics: Noise Vibration and Noise Control

Helicopter Noise Transmission It is planned to introduce a regular helicopter service from a helipad at ground level in a hospital premises. There will be four arrivals and four departures per day but never more than one arrival and one departure in any hour. There is a school...

science

A 100 kg crate is pushed at constant speed up the frictionless 30 degree ramp by a horizontal force vector F. What are the magnitudes of a) vector F and b) the force on the crate from the ramp? I am not sure how to find part a. What would I need to do to find it? for part b ...

social!

To what extent should societies attempt to meet present needs, and to what extent should they try to provide for the future to the extent that they provide enough needs for now, and what is left is left. Theres old/extremist political views called libertarianism and socialism...

physics

When a large bone such as the femur is broken, the two pieces are often pulled out of alignment by the complicated combination of tension and compression forces that arise from the muscles and tendons in the leg (see the X­ray image in Figure P3.64A). To realign the bones and...

calculus

When an oil well burns, sediment is carried up into the air by the flames and is eventually deposited on the ground. Less sediment is deposited further away from the well. Experimental evidence indicates that the density (in tons per square mile) at a distance r in any ...

Math

A one-meter rod is suspended at its middle so that it balances. Suppose one-gram on the rod at the following distances from one end. 20cm 27cm 38cm 44cm 58cm 70cm 83cm 94cm Where must a one gram weight be hung so that the rod will balances at the 50 centimeter mark Where must ...

Math

A one-meter rod is suspended at its middle so that it balances. Suppose one-gram on the rod at the following distances from one end. 20cm 27cm 38cm 44cm 58cm 70cm 83cm 94cm Where must a one gram weight be hung so that the rod will balances at the 50 centimeter mark Where must ...

physics

An astronaut weighs 696 N on the Earth. What is her weight on planet X, which has a radius Rx = Rearth 1.60 and a mass Mx = Mearth 8.60? -the only equation I know for weight is "w = m x g"...I don't know how to solve for w using force.

earth comm fluid and spheres science

can someone explain the relationship between ocean circulation patterns during an el nino event and atmospheric circulation?

earth science

What are the main basic thing that we need to know about erosion? some are like the agents, running water .... and please tell me some more...

Science

If Earth's axis had no tilt, we'd only have spring and fall for seasons, right? But which hemisphere would get the vernal equinox and which would get the autumnal?

5th grade

correct noun form please. bob know that he had to have the (earth's/earths) smell on him before the (horses/horses') would accept him.

earth science

If all matter is made up of the same atoms from the periodic table, is there a big difference between living organisms and non living objects? why or why not?

science

The thin, outer layer of the earth's surface is its_____. a) skin b)crust c) core d) soil e) surface Just need to know if my answer or right or wrong. Thanks! :) b

Physics

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?

Earth CRYience

Assume a parcel of air on the surface with a temperature of 29 degrees Celsius with a relative humidity of 50%. If the parcel rises at what altitude should clouds form?

physical science with earth science

Write a balanced chemical equation for the reaction for propane C3H8 burning in oxygen to for carbon dioxide and water vapor

Physics

Find the net force of gravity on the moon (Mm = 7.35 x 10^22 kg) from the earth and the sun (Ms = 1.99 x 10^30). Assume that the two forces are perpendicular to each other. Give the angle in relationship to the sun.

Earth Science

As a star ages, its internal composition changes as nuclear reactions in the star's core convert one element into another. True or false?

Astronomy

In what ways do Earth and the moon move through space? How do these motions produce such phenomena as day and night, the seasons, phases of the moon, and eclipse?

Earth Science

How is the local hydrologic cycle affected by the practice of drawing drinking water from a river and then returning sewage to the same river? Can anyone please help?????? THANKS A LOT!!!!!

physics

( If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 1.33 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2?

physics

a projectile is fired from the surface of the earth with a speed of 200 m/s at an angle of 30 degrees above the horizontal. If the ground is level, what is the maximum height reached by the projectile

physics

A person can jump a maximum horizontal distance (by using a 45 projectile angle) of 5 m on Earth. What would be the maximum range on Mars, where the acceleration due to gravity is 0.38 g?

English

What is the meaning of "When once you have tasted flight, you will forever walk the Earth with your eyes turned skyward, for there you have been, and there you will always long to return"?

physics

(a) If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 3.43 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2

Physics (Kinematics)

A ball is thrown 83.3 m upward and then falls back to earth.Neglecting air resistance, how long will it be in the air? The acceleration of gravity is 9.8 m/s2 . Answer in units of s

College Physics

Suppose a planet is discovered that has the same total mass as the Earth, but half its radius. Calculate the acceleration due to gravity on the surface of this planet.

maths

A well of diameter 7cm is dug 22.5m deep.The earth taken out it is spread evently all around it to a width of 10.5 to from an embankment .find the height of the embankment.

Creative writing

Does it make sense to say that someone was "spiraling towards the earth at breakneck speed" or should I pick a better word than spiraling? Any suggestions?

Physics/Astronomy

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

Optics/Physics

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

Physics

If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 2.07 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2?

physics

A ball is thrown 107 m upward and then falls back to earth. Neglecting air resistance, how long will it be in the air? The acceleration of gravity is 9.8 m/s2 . Answer in units of s

Projectile motion

A cannon is fired from a cliff top 15m high and at 30 degrees. It takes 3 seconds for canon to reach the earth, what is the initial velocity of the cannon

Math

The population of the Earth is approximately 6 billion people and is growing at an annual rate of 1.9%. Assuming a Malthusian growth model, find the world population in 42 years

Physics

Two trains approach each other on parallel tracks. Each has a speed of 20.0 km/hr with respect to the earth. If they are initially 18.0 km apart, how long (in seconds) will it be before they pass each other?

SCIENCE ASAP HELP PLEASE

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

physics

Estimate the average speed of the apollo spacecaft in m/s, given that the craft took five days to reach the moon from eaeth .the moon is 3.8*10 to the power 8m from earth.

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