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

24,970 results, page 37

### Physics

If you weigh 670 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 = 1.99×1030 kg , the gravitational constant to be G = 6.67×10−11 N⋅m2/kg2...

### Biology-Is my answer correct

Which of the following must occur for a mismatch error to be repaired? Which is the best answer, I think it's A, am I right? A)Damaged DNA must be identified by DNA repair proteins B)The sequence of nucelotides in the damaged DNA sequence must guide the synthesis of the ...

### Physics

The space shuttle is in a 200-mile-high orbit. What is the shuttle's orbital period?

### Geometry

A globe sits on a geography teacher's desk. The diameter of the globe is 0.001 km. The earth has a diameter of 12, 713.54 km. Find the ratio of the volume of the globe to the volume of the earth.

### physics

A pendulum has a period of 0.9 s period on Earth. An object is suspended from a spring with force constant 9.8 N/m. (d)Find the mass suspended from this spring that would result in a period of 0.9 s on Earth

### Physics

Hi, I'm stuck with the following question: The acceleration due to gravity on Mars is only 3.75m/s^2. You would like to modify an antique grandfather clock so that it would still keep accurate time on Mars. If the length of the pendulum on Earth is l, what should the length of...

### Physics

Planet Earth as a Spring. Assume that the Earth is perfect sphere of mass M=5.98x10^24kg, radius 6,370km, and uniform density. Imagine a long, straight tunnel through the center of the Earth, connecting the North and South poles . A capsule of mass m is dropped into this ...

### astronomy

A body has four times the mass of the Earth but its radius is two times larger. What is the acceleration of gravity on the surface of this planet? If you were on this planet, should you be able to jump (on average) farther distances, shorter distances or the same distances as ...

### math chem

Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere. Earth¡¯s oceans, because of their high heat capacity, can absorb heat and therefore act to slow down global ...

### Math

You will be designing a park your park must contain the following a rectangle 100yds x 120yds . A picnic n playground area must be add up to be at least 1/2 of the park the picnic area must have a circular garden

### Physics

A military helicopter on a training mission is flying horizontally at a speed of 60.0 m/s when it accidentally drops a bomb (fortunately, not armed) at an elevation of 300 m. You can ignore air resistance. How much time is required for the bomb to reach the earth? 7.82s How ...

### Chemistry

What the difference between an orbit in the Bohr model and an orbital in the quantum mechanical model of the atom?

### Physics

: a planet mass M is circling a star in an elliptical orbit it's velocity at R is 60000 m/s what is its velocity at RB? RB=8RA

### English

1. Read the following paragraph from "Five Hours to Simla." After the cacophony of screeching brakes and grinding gears, there followed the comparatively static hum of engines, and drivers waited in exasperation for the next lurch forwards. For the moment there was a lull, ...

### Physics

In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 600 N, to the ...

### Maths

I posted yesterday but feel I confused the issue with an incorrect calculation of an angle, I have just realised my mistake!. I also think I should come clean about my circumstances. I am a mature (very) student, in fact a retired commercial fisherman and am studying celestial...

### Science (Physics)

Gravity on the surface of the moon is only 1 6 as strong as gravity on the Earth. What is the weight of a 30 kg object on the Earth? The acceleration of gravity is 10 m/s 2 . Answer in units of N What is the weight on the moon? Answer in units of N What is the mass on the ...

### science

1. Why do earthquakes occur along the San Andreas Fault? a. Two plates meet at the San Andreas Fault and they slide next to each other causing earthquakes b. Two plates converge at the San Andreas Fault causing earthquakes*** c. Two plates pull apart at the San Andreas Fault ...

### Physics ( using earth to find pressure of planet y

3. A model of Earth’s interior: Look up the radius and mass of the Earth. Radius is 6,371 km Mass is 5.974 x 10^24 kg Calculate its average density. p_e = (5.974 x 10^24 kg)/ (4/3)pi r^3 = (5.974 x 10^24 kg)/ (4/3)pi (6371)^3 = 5.54 g/cm^3 Imagine a planet of the same radius...

### Phyics

The average distance between Earth and the sun is 1.50e8 km. Calculate the average speed, in km/h, of Earth assuming a circular path about the sun. Use the equations v = 2r/T. Please ignore this question and view the question I have a few spaces above. The equation was not ...

### physics

You weigh 516 N at sidewalk level outside the World Trade Center in New York City. Suppose that you ride from this level to the top of one of its 410 m towers. Ignoring Earth's rotation, how much less would you weigh there (because you are slightly farther from the center of ...

### physics

Help me solve this physics homework: in sense we all have kinetic energy,even when we are standing still.the earth with a radius of 6.37*10power6 m,rotates about its axis once a day.ignoring the earths rotation about the sun,what is the K.E of a 50Kg man standing on the ...

### Nautical Studies

I understand it is a popular misconception that a magnetic compass points to the magnetic north pole. In fact a magnetic compass aligns itself with the magnetic lines of force in its own location. Here in the UK these lines of force seem to coincide very closely with the ...

### math

The planet Mercury travels 180,600 miles in its orbit during the 7 hours that make up a typical school day. Find the unit rate.

### science

an electron orbiting around hydrogen atom in circular orbit of radius 1armgstrom with the speed of 5*10^6 m/sec. Calculate magnetic field produced at the nucleus?

### science

1) The force of gravity on the moon is 1/6 the force of gravity on earth. If you had a 1 kg box of cereal on earth which had a weight of 2.4 N, what would its mass be on the moon? why? 2) what is the volume of a textbook with dimensions 21.3 cm, 27.5 cm, 2.9 cm? please help me...

### Math

The speed of light is 3¡Á¡¼10¡½^8 meters/second. It takes 5¡Á¡¼10¡½^2seconds for light to travel from the sun to the earth. What is the distance in meters between the sun and the earth? Express your answer in scientific notation.

### Physics Problem 6.20

The center of a 1.40 km diameter spherical pocket of oil is 1.50 km beneath the Earth's surface. Estimate by what percentage g directly above the pocket of oil would differ from the expected value of g for a uniform Earth? Assume the density of oil is 8.0*10^2kg/m^3. Express ...

### science

Granite is an igneous rock that forms from magma cooled below Earth's surface.Why would granite have larger crystals than igneous rocks formed from lava cooled above Earth's surface?

### math

the distance from the sun to earth is about 1.5x10^11 meters. suppose light travels at a speed of 3x10^8 meters per second. About how long does it take light from the sun to reach earth? PLEASE HELP!!!

### physics

Calculate the angular momentum of the Earth the arises from its spinning on its axis. Also calculate the angular momentum of the Earth that arises from its orbital motion around the sun. Please help I'm stumped on a take home test.

### physic

A 1000-kg satellite travels with an orbital speed of 500 m/s around a planet at an orbital raduis of 8000 km. What is the mass of the planet

### math

Afarmer must purchase 100 animals. He must spend exactly $100. He must have at least one of each animals. Sheep cost $.50, cattle cost $1.00 and horses cost $10

### science

movement of earth around sun and movement of moon around earth

### earth science...help

for this question: Put the folloing words together in a few sentence to explain their meaning and relationship to one another: seismic waves, seismograms, seismoghaps, and seismologists. is this answer suitable: Seismic wave is an elastic shock wave that travels through the ...

### physics

A military helicopter on a training mission is flying horizontally at a speed of 75.0m/s when it accidentally drops a bomb (fortunately, not armed) at an elevation of 310m . You can ignore air resistance. a:How much time is required for the bomb to reach the earth? b:How far ...

### math/chem

it is estimated that uranium is relatively common in the earth's crust, occurring in amounts of 4 g/metric ton. a metric ton is 1000kg. at this concentration, what mass of uranium is present in 1.0 mg of earth's crust?

### maths

If the speed of light is 3x10^8m/s and the distance around the earth is 4.5x10^4 km and a plane could travel at half a speed of light, how long would it take for the plane to fly around the earth twice?

### Math

A plumber's assistant's rate of pay is $0.75 per cubic foot of earth moved. He moves 220 cubic feet of earth to dig a trench. He moves the same amount to fill the trench. What is his pay for this job?

### Science

1. The combination of sulfur dioxide, nitrogen oxide, and atmospheric moisture creates A. drinking water. B. smog. C. pesticides. D. acid rain. D? 2. Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. eukaryotes. B. cyanobacteria. C. ...

### Physics

the space shuttle is in a 250 mile high orbit. What are the shuttle's orbital period, in minutes, and it speed?

### Astronomy - Plantet (MARS)

For an assignment I have to research Mars. Including size, temperature and gravity. My teacher wants a summary of these. Can someone please help me shorten this wall of text into like 1 paragraph? It was 1 full page before, but I took out all the technical terms and stuff. but...

### physics

A mass is suspended on a spring scale. The scale shows a reading of 5N and stretches a distance of 0.2 meters from its relaxed length. 1)What is the spring constant of the scale? )If this scale was taken to a planet that has a mass 4 times larger than the earth and a radius 4 ...

### Math

A satellite dish has a diameter of 32 inches and is 6 inches deep. If the antenna needs to be put at the focus of the parabola, where would the parabola be placed?

### Math

How high does the satellite have to be in order to see two cities at the same time if the cities are 2250 mi apart? (Round your answer to the nearest mile I thought it was 225 but I was wrong please help

### physics

The electron gun in a color TV accelerates the electrons through about 25,000 Volts. Estimate the acceleration of such an electron due to the magnetic field of the earth. Hint: In Atlanta, the Earth's magnetic field has a magnitude of about 5.2 X 10-5 T.

### Algebra

Using the formula: w=Cr^-2 where C is a constant, and r is the distance that the object is from the center of Earth. W is the weight. 1- Suppose an object is 100lbs when it is at sea level. Find the Value of C that makes the equation true. Sea level is 3,963 miles from the ...

### earth

rachelcarson "silent spring" agriculture and the movement that launched the environmental movement.. Question pros&cons of agriculture based on silent spring, A revolutiondown on the farm, and whole earth discipline compare&contrast Dr. Russ, or others

### Physics (please help!!)

The moon causes tides because the gravitational force it exerts differs between the side of the Earth nearest the Moon and that farthest from the Moon. Find the difference in the accelerations toward the Moon of objects on the nearest and farthest sides of the Earth.

### Business math

A plumber's assistant's rate of pay is $0.75 per cubic foot of earth moved. He moves 220 cubic feet of earth to dig a trench. He moves the same amount to fill the trench. What is his pay for this job?

### physics

1) write the formula to find the magnitude of gravitational force between earth and an object on earth's surface 2) how does the value of gravitational force 'f'change between two objects? 3) what is direction of an object moving with an acceleration due to gravity?

### Chemistry

It is estimated that uranium is relatively common in the earth’s crust, occurring in amounts of 4 g/metric ton. A metric ton is 1000 kg. At this concentration, what mass of uranium is present in 1.0 mg of the earth’s crust?

### Physical Science

The acceleration due to gravity is about 10 m/s2 at the Earth's surface. What is the acceleration due to gravity for a person on the space station orbiting 200 miles above the Earth's surface?

### Earth Science

what is the driving force for the movement of the lithospheric plates? a- heat from the sun b- unequal distribution of heat within Earth c- heat in the atmosphere d- unequal distribution of heat from the oceans My answer is B

### math

2.If a sledgehammer that weighs 18 newtons on Earth will weigh about 4 newtons on the planet Namar, then your weight on Namar would be about ___ times your weight on Earth. A. 0.25 B. 4 C. 0.5 D. Not enough information

### Math

Polar ice is about 3/4 of the 3% of Earth's fresh water. What fraction of all of Earth's water is polar ice?

### Math

Tiffany is constructing a fence around a rectangular tennis court. She must use 300 feet of fencing. The fence must enclose all four sides of the court. Regulation states that the length of the fence enclosure must be at least 80 feet and the width must be at least 40 feet. ...

### physics

About 50,000 years ago, in an area located outside Flagstaff, Arizona, a giant 4.5x10^7 kg meteor fell and struck Earth, leaving a 180 m hole now known as Barrington crater. If the meteor was traveling 20000 m/s upon impact, with what average force did the meteor hit Earth? ...

### physics

The Moon has a mass of 7.35 1022 kg and its equatorial radius is 1.74 106 m. Earth’s mass is 5.97 1024 kg and its equatorial radius is 6.38 106 m. (a) Calculate the magnitude of the gravitational force exerted by i) the Moon on a fully suited 100-kg astronaut ...

### Space craft

How will you overcome these challenges with the design of your spacecraft? (I decided to choose the inner planet mercury) I put: Mercury is very different than Earth. It’s far rougher than earth; the main problem is the temperature. Humans can’t just live there without the...

### physics

The spectrum of light from the galaxy M100 has a prominent dark line at a wavelength of 592.2 nm. The same spectral line observed in a lab on earth has a wavelength of 589.4 nm. How fast is M100 moving relative to earth? (the speed of light = 3.00 x 108ms-1)

### Science

Which of the following describes the slowest change on earth's surface? A) Gravity pulls an area of wet soil and rock downward in a landslide B) An earthquake releases energy that built up below Earth's surface C) Lava explodes from a volcano on an island D) A canyon forms as ...

### Math

which mountains peaks can be seen from Oahu. Island Distance(Mi) Mountain Height(ft) Molokai - 40 - Kamakou - 4,961 A) Radius of earth= 3960 mi. Determine angle formed at the center of the earth. B) Determine length of the hypotenuse. Could someone go through the steps to ...

### physics

Jessica weighs 540 Newtons, According to Newton's 3rd law, if the Earth pulls on Jessica 540 N, then Jessica pulls on the Earth 540 N acting in the opposite direction. If she trips while rollerblading, why will she fall to the ground

### physics

how does the gravitational force exerted by earth on the sun compare with the gravitational force exerted by sun on the earth? and would you expect tides to be higher at the equator or at the north pole? why?

### physics

The sun is 1.5 1011 m from the earth. (a) Over what surface area is solar radiation spread at this distance? (b) What is the total power radiated by the sun? (The sun delivers energy to the surface of the earth at a rate of approximately 1400 W/m2.) (c) Treating the sun as a ...

### physics (Mathmate)

The space shuttle is in a 250 mile high orbit. What are the shuttle's orbital period, in minutes and its speed?

### Science

How many ice ages do scientist estimate have occurred during the last billion years? 3 5************************************* 6 7 How often do scientists say that recent cycles of advancing and retreating ice sheets occur? approximately every 100,000 years******* approximately...

### Algebra

The diameter of the moon is about 3476 kilometers. The distance from earth to moon is about 384,400 kilometers. About how many moons could be lined up in a row between earth and the moon? Round to the nearest whole number. Please help answer thanks

### chem/math

How much heat would be required to warm Earth¡¯s oceans by 1.0 ¡ãC? Assume that the volume of Earth¡¯s oceans is 137 x ¡¼10¡½^7 ¡¼km¡½^3 and that the density of sea water is 1.03 g/cm3. Also assume that the heat capacity of seawater is the same as that of water.

### science

One factor determining the effect of gravity on objects is their.....? The farther away from Earth an object gets, Earth's gravity affects it ......? Friction that occurs between the surface of around object and another surface is ........? Objects with larger surfaces have ...

### phys

a spaceship travels with a speed of 0.7c as it passes by the Earth on its way to a distant star. The pilot of the spaceship measures the length of the moving ship as 50m. Determine its length as measured by a person on Earth. Answer in units of m. for this question, do I just ...

### phys

a spaceship travels with a speed of 0.7c as it passes by the Earth on its way to a distant star. The pilot of the spaceship measures the length of the moving ship as 50m. Determine its length as measured by a person on Earth. Answer in units of m. for this question, do I just ...

### physics

Dean is hunting in the Northwest Territory at a location where the earth's magnetic field is 8.0x 10^-5 T. He shoots at a duck decoy by mistake, and the rubber bullet he is using acquires a charge of 3.0 x 10 ^ -12 C as it leaves his gun at 300m/s, perpendicular to the earth's...

### Physics

Dean is hunting in the Northwest Territory at a location where the earth's magnetic field is 7.0x 10^-5 T. He shoots at a duck decoy by mistake, and the rubber bullet he is using acquires a charge of 2.0 x 10 ^ -12 C as it leaves his gun at 300m/s, perpendicular to the earth's...

### Physics

A rock is falling towards the Earth. Suppose the action force is the pull of the Earth on the rock. What is the reaction force? I do not know how to find the reaction force.

### Earth Science

Scientists tell us that the Earth is suffering ill effects from ozone depletion and the greenhouse effect. Compare these two phenomenons. What aspects do they have in common? How might they actually help eah other to produce conditions in which humans and plants would find it ...

### physics

The radius of a planet R1 and satellite revolves round it in a circle of radius R2. The time period of revolution is T.find the acceleration due to the gravitation of the planet at its surface.

### science

i have to do a homework assignment on how the earths orbit and tilt are causing global warming and i cant find anything but greenhouse effect please help. i gotta turn this in tomarrow

### Astronomy

You've been told the Earth puts out 0.070 [W/m squared] as a global average. What would you predict would be the surface heat flux in [W/m squared] from a planet that is 70% larger in radius than the Earth, but has the same bulk composition. You can assume the only source of ...

### additional science: physics

Hello i have 2 questions in total. 1) The meteor enters the Earth’s atmosphere with an acceleration of approximately 9.7 m/s2 and with a force acting on it of 1.94 N. What is the mass of the meteor? Show your calculations. 2) Compare this value of the acceleration due to ...

### American Goverment

When the President vetoes a bill he (Points : 1) must veto the entire bill. may veto the items he thinks are not important. must submit his veto recommendation to his entire Cabinet for approval. must justify his veto to Congress.

### Math Help!!!

How many 3 letter sequences can be formed if the first letter must always be a consonant (not a, e, i, o, u), the second letter must always be a vowel (a,e,i,o,u) and 3rd letter must be different from the first. A. 2100 B. 4056 C. 3250 D. 2625 I chose A... i guessed

### Math

Radius of earth 3,959 miles Space shuttle orbits 200 miles above earths Surface Space shuttle completes 220 degrees of a Revolution around earth in one day What is the average speed of the space Shuttle

### Math

Radius of earth 3,959 miles Space shuttle orbits 200 miles above earths Surface Space shuttle completes 220 degrees of a Revolution around earth in one day What is the average speed of the space Shuttle

### physics

Consider a spacecraft that is to be launched from the Earth to the Moon. Calculate the minimum velocity needed for the spacecraft to just make it to the Moon’s surface. Ignore air drag from the Earth’s atmosphere. Hint: The spacecraft will not have zero velocity when it ...

### physics

Consider a spacecraft that is to be launched from the Earth to the Moon. Calculate the minimum velocity needed for the spacecraft to just make it to the Moon’s surface. Ignore air drag from the Earth’s atmosphere. Hint: The spacecraft will not have zero velocity when it ...

### Physics

It can be shown that for a uniform sphere the force of gravity at a point inside the sphere depends only on the mass closer to the center than that point. The net force of gravity due to points outside the radius of the point cancels. Part A How far would you have to drill ...

### physics

27. A communications satellite transmits a radio wave at a frequency of 5 • 109 Hz. What is the signal’s wavelength? Assume the wave travels in a vacuum. Show your work. (3 points) I at least need the formula and how to solve it... not the answer.

### physics

a projectile is ejected from a 25 m high tower with a velocity of 40 m/s at an angle of 30 degrees to the horizontal first on Earth and then on Mars. What is the ratio of the time taken to hit the ground on Mars compared to Earth? (Assume gravity on mars = .38gEarth) The ...

### Chemistry

Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?

### Chemistry

Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?

### Chemistry

Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?

### Chemistry

In order for a cell potential to be a standard cell potential, the concentration of all ions in solution must be ________ M, the partial pressures of all gaseous species must be _______ atm, and the temperature must be ________ K. I need help with the blanks.

### Chemistry

In order for a cell potential to be a standard cell potential, the concentration of all ions in solution must be ________ M, the partial pressures of all gaseous species must be _______ atm, and the temperature must be ________ K. I need help with the blanks.

### English

(Thank you. I corrected them. Does 'something' in Sentence 1 mean 'an important thing'? More explanation, please. Thank you.) 1. Volunteer work is not something that you must do. 2. Volunteer work is not anything that you must do. 3. Volunteer work is not a thing that you must...

### math

The ratio of an objects weight on earth to its weight on Neptune is 5:7. How much would a person who weighs 150 pounds on earth weigh on Neptune? A.210 pounds B.750 pounds c.107 1/7 pounds D.170 pounds

### science

A space probe of the surface of Mars sends a radio signal back to the Earth, a distance of 3 x 1010 km. Radio waves travel at the speed of light (3.00 x 108 m/s). How far away is the space probe? How many seconds does it take for the signal to reach the Earth? How many hours ...

### Math

A plumber's assistant's rate of pay is $0.75 per cubic foot of earth moved. He moves 220 cubic feet of earth to dig a trench. He moves the same amount to fill the trench. What is his pay for this job? $___________ (These questions are all confusing)