Why must the centre of the satellite orbit coincide with the centre of the Earth?
25,650 results, page 39

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 ... 
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 
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 ... 
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 ... 
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... 
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 ... 
geography
To maintain the current population density, which of the following must occur? a. The death rate must be higher than the birth rate. b. The birth rate must be higher than the death rate. c. The birth rate and death rate must stay the same with migration at 0. d. The birth rate... 
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 ... 
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 
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) 
Precalculus
Find the distance along an arc on the surface of the earth that subtends a central angle of 1 minute. (1 minute = 1/60 degree) This is a nautical mile. Note that the radius of the Earth is 3960 miles and there are 1760 yards in a mile. Express your answer in both miles and yards. 
Math
Can someone please help me set this up. I didn't quite understand how to do this today. Before leaving Earth, the mass of an astronaut is measured to be 60kg. The astronaut lands on the Moon and measures the acceleration of gravity to be 1.6 m/s2(squared). What would the ... 
Physics Help please
The freefall acceleration on Mars is 3.7 m/s2. (a) What length pendulum has a period of 4 s on the earth? cm What length pendulum would have a 4 s period on Mars? cm (b) A mass is suspended from a spring with force constant 10 N/m. Find the mass suspended from this spring ... 
Science
A CHILD IS BORN ON EARTH IN 2000. yOU ARE 94.6 TRILLION KILOMETERS AWAY FROM EARTH AND YOU SEE THE CHILD'S 3RD BIRTHDAY. HOW OLD IS THE CHILD AT THE TIME OF THE CHILD'S 3RD BIRTHDAY? 
astonomy
Assume that earth and mars are perfect spheres with the radii of 6,371km and 3,390 km, respectively. Calculate the surface area of earth. b)calculate surface area of mars 
math
An object weighing 5 pounds on Earth will weigh 2 pounds on Mercury. The Brooklyn Bridge weighs 14,695 tons on Earth. What would it weigh on Mercury (in tons) ? 
science
Couple of questions. Why does the earth keep moving? The engine of a rocket applies a continual force to push the rocket along. When the engine stops what will happen? I think the rocket will stop acceleration You need to be aware of the concept of inertia. Inertia is the ... 
Physics
1. Planet X orbits the sun with a mean orbital radius that is 6200 times that of earth. Its diameter is twice that of earth, and its mass is 8 times that of earth. A) Calculate the year of the planet X. B) Calculate the acceleration due to gravity on planet X. C) Calculate the... 
physics
On a distant planet, golf is just as popular as it is on earth. A golfer tees off and drives the ball 3.7 times as far as he would have on earth, given the same initial velocities on both planets. The ball is launched at a speed of 44 m/s at an angle of 52° above the ... 
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) Calculate the kinetic energy that the earth has because of its rotation about its own axis. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States in one year is about 9.33e9 Joules... 
earth
On planet Tehar, the freefall acceleration is the same as that on Earth but there is also a strong downward electric field that is uniform close to the planet's surface. A 2.00 kg ball having a charge of 5.00 µC is thrown upward at a speed of 29.2 m/s and it hits the ground ... 
earth
On planet Tehar, the free fall acceleration is the same as that on the Earth, but there is also a strong downward electric field that is uniform close to the planets surface. A 2.00k ball having a charge of 5.00C is thrown upward at a speed of 20.1 m/s. It hits the ground ... 
Algebra
Available evidence suggests that about 20 percent of the asteroid’s mass turned to dust and spread uniformly over Earth after eventually settling out of the upper atmosphere. This dust amounted to about 0.02 g/cm^2 of Earth’s surface. The asteroid very likely had a ... 
PHYSICS
Is it a must that a nucleus must have opposite nature with the electron 
Science
Compare the nature greenhouse effect process with the human induced. 2. What are the greenhouse gases? Which one is the biggest concern? 3. What are scientists doing to collect data? 4. What role does the carbon cycle play in this problem? 5. What are the political and ... 
physics??
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a person situated (a) at ... 
physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a person situated (a) at ... 
Physics
The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass... 
Physics
1.) The earth's radius is about 3956.52 mi. An object that has a mass of 20 kg is taken to a height of 160 km above the earth's surface. a. What is the mass of the object at this height? b. How much does the object weigh at this height? 
Math
How to factor x^3  3x^2 + 4 =0 Use D'Alembert's Rational Roots Theorem. Any rational roots of the form of p/q (p and q assumed to be relatively prime) must be such that p divides the constant term (in this case 4) and q divides the coefficient of the largest power of x (in ... 
science
lunar probes: what else does a lunar probe have other than a camera? i need to know today becasue it is for aproject and it is due tomorrow please help!!!!!! You will find a description of some of the first lunar probes that actually landed on the moon at http://www.jpl.nasa.... 
math
desperately seeking help. work must be shown. answer must be in simplest form. Thanks 1 1 _ X _ 2 2 
phydraulic
A cylinder must move a 2000 lb load 2 ft. How much work must it perform? 
Microeconomics
When average total cost is declining then: a) marginal cost must be less than average cost b) marginal cost must be greater than average cost c) average toal cost must be greater than average fixed cost d) average variable cost must be declining. My answer is d but my friend ... 
political science
Which of the following conditions was NOT a part of the Lemon Test, as established by the Supreme Court? A. They must not entangle the government exclusively with religion B. The primary effect must not be to advance or inhibit religion C. There must be a secular purpose D. ... 
Government
Which scenario best illustrates how the power to make treaties in the united states constitution provides for checks and balances among the three branches of government ? A. the president must sign an executive agreement without the senate, but must have approval of the house ... 
Astronomy
1. What color are stars that are very hot and very bright? A. Red B. Blue C. White D. Yellow 2. During the contraction of a protostar, density increases and ______ rises. A. Nuclear energy B. Dust C. Temperature D. Outflow 3. What is the apparent brightness of a star? A. How ... 
science
The moon spins,or_____ ,in space. The words to use for this is revolves ...rotates...orbit lunar eclipse...or solar eclipse 
Physics
A 2.0 mm diameter glass sphere has a charge of +1.0 nC. What speed does an electron need to orbit the sphere 1.0 mm above the surface? (Ans. 2.81×107 m/s) 
Physics
Consider a NASA spacecraft in a circular orbit 440 km above the surface of Mars. What is the spacecraft's orbital period in hours? 
biology
which of the following is not a characteristic of life A. maintains homeostasis B. composed of cells C. composed of atoms D. carries out metabolism which of the following must be true to consider something to be alive? A. it must be able to replicate it's DNA B. it must be ... 
biology
which of the following is not a characteristic of life A. maintains homeostasis B. composed of cells C. composed of atoms D. carries out metabolism which of the following must be true to consider something to be alive? A. it must be able to replicate it's DNA B. it must be ... 
physics
for both of these object system1: earth and ball if a ball is falling down, is the work done on it positive since force and displacement are in the same direction. system 2: earth and basket a basket is tied to a rope and is dropped then come to a full stop, then is the work ... 
hello reiny damon steve can you help me physics
Find the Gravitational potential at a point on the earth's surface. Take mass of earth as 5.98*10^24kg, it's radius as 6.38*10^6m and G=6.67*10^11Nm^2kg^2. Plz i need sir damon and steve including reiny to show me step and solution plz 
physics
Meteorites from Mars Several meteorites found in Antarctica are believed to have come from Mars, including the famous ALH84001 meteorite that some believe contains fossils of ancient life on Mars. Meteorites from Mars are thought to get to Earth by being blasted off the ... 
AP Physics B
Calculate the force of gravity on a spacecraft 12,800 km (2 earth radii) aboce the Earth\'s surface if its mass is 1400 kg. Ok for this question I first converted to meters for the radius then applied newtons law net force radial = m1 a radial = Fg = r^2 G m1 m2 Fg = (1.28 E ... 
WAN
Provide a hypothetical situation for each signal type that illustrates how it could be, or is being, used in a WAN. In what circumstance, for example, would a company choose to use a satellite signal 
Math
An astronomical researcher is using software to study the parabolic path of an asteroid. By entering the equation for the path of the asteroid, the researcher could determine if the asteroid would collide with any other bodies in the near future. The equation for the asteroid... 
Physics
A hypothetical spherical planet consists entirely of iron (p=7860 kg/m^3). Calclate the period of a satellite that orbits just above its surface. I started out with the pressure formula P=M/V, but i kept subbing in other formulas, but i get stuck..can someone help me? thanks. 
Physics
a spacesatellite mass of 600kg fires a rocket engine for 2 seconds expelling 40kg of exhaust gases at 350m/s. By how much will the speed of the capsule change? You may consider the initial relative velocities to be zero, but would it matter? 
Physics Using hydrostatic equilbrium)
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 Using this Imagine a planet of the ... 
Earth's Dynamic Atmosphere
Air pressure doesn't crush everything underneath it because A. air pressure is hypothetical and not a real force. B. air pressure is strong enough. C. things on earth have learned to withstand the constant pressure. D. air pressure is exerted in all directions. my answer is b. 
math
the turkey must cook for 4 hours 45 minutes. at what must it be put into the oven in order to be done by 3:00 p.m.? 
physic
Hi,could anyone help me with this questin please. Thank you so much. some folks on your planet waant to travel to the moon.But what happens to their clocks, it they leave the Earth?for other bodies, like the moon or planets the acceleration due to gravity at their surfaces ... 
French
How do you say You must put on your seatbelt? ans: Vous faut mettre sur votre ceinture de securite You must use your signal to turn ans: vous faut utiliser votre clignotant avant de tourner You must not use your phone while driving ans: Vous ne faut pas utiliser votre ... 
Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated... 
Physics
The center of a 1.10km diameter spherical pocket of oil is 1.10km 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 . Express your answer using two... 
Phsyics
The center of a 1.10km diameter spherical pocket of oil is 1.10km 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 . Express your answer using two... 
physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the speed and centripetal acceleration of a person ... 
Science
Why are the days typically hotter in June than in December here in the US? D. Because the United States faces the sun in the summer and faces away from the sun in the winter E.Because the tilt of the Earth causes the sun's rays to be more concentrated in the summer due to the ... 
physics
Two stones of different masses are thrown straight upward one on earth and on the moon (where gravity produces an acceleration of 1.67m/second squared) Both reach the same height. if the stone on the moon has an initial speed v, what was the initial speed of the stone on earth... 
Physics
Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ... 
Physics
Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ... 
Physics
Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ... 
physics
The planet Jupiter is more than 300 times as massive as the Earth But it so happens that a body would scarcely weigh three times as much on the surface of Jupiter as it would on the surface of Earth. Can you think of an explanation for why this is so? (Hint: Let the terms in ... 
physics
The planet Jupiter is more than 300 times as massive as the Earth But it so happens that a body would scarcely weigh three times as much on the surface of Jupiter as it would on the surface of Earth. Can you think of an explanation for why this is so? (Hint: Let the terms in ... 
Physics
A proton moves eastward in the plane of Earth’s magnetic equator so that its distance from the ground remains constant. What is the speed of the proton if Earth’s magnetic field points north and has a magnitude of 5.2 × 10−5 T? The acceleration of gravity is 9.81 m/... 
Physics (G and g)
Please, I need help with this problem. I would really appreciate it. The top of Mt. Everest is 8850 m above sea level. Assume that sea level is at the average Earth radius of 6.38×106 m. What is the magnitude of the gravitational acceleration at the top of Mt. Everest? The ... 
PHYSICS
Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ... 
Physics
Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ... 
physics
At the surface of Jupiter's moon Io, the acceleration due to gravity is 1.81 . A watermelon has a weight of 43.0 at the surface of the earth. In this problem, use 9.81 for the acceleration due to gravity on earth 
earth
Find the ratio of the gravitational attraction between (a)a man of mass 100 kg and a woman of mass 50 kg who is 10 meters away from him and (b) the attraction between the woman and the Earth. 
Science Physics
An object weighs 12 N on earth. When it is brought to Mars, it has a weight of 4.8 N. What is the acceleration due to gravity on Mars? (Taking the acceleration due to gravity on earth is 10 m/s²) 
Maths
For this question, use the copy of the Random Number table provided at the end of this AAT. (This table was copied from page 111 in the Textbook.) Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range from 48 to 58 ... 
Reading
The Kepler spacecraft was designed to investigate humanity last unexplored frontier the far reaches of space. The NASA space telescope looks deep into the Milky Way galaxy for the sign of habitable planet where a human can potentially thrive, in the thousands of planets it has... 
physics
An engineer must design a runway to accommodate airplanes that must reach a ground velocity of 60 m/s before they can take off. These planes are capable of being accelerated uniformly at the rate of 2.1 m/s2. (a) How long will it take the planes to reach takeoff speed? s (b) ... 
Math
The scale for an earth model is 1:40000000. The diameter of the earth is 12,756.32km. a)What is the diameter of the model in cm? b) If the model is cut in half, how many jars of paint would be needed to paint each half if 1 jar covered 10cm^2? 
English Writing
Please help me... People believe in God because... And there is life on earth because... And people who believe in God think that God has put human beings on this earth because... I have to write continue of these sentences... Could you guys help me please? 
ap physics c
Hi! I am struggling with this problem any help would be much appreciated thank you astronauts on their way to the moon reach a point > at this point, the moon's gravitational pull becomes stronger than the earth's gravitational pullfind the distance between this ... 
Physics wavelength problem! Please Help!
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 Thank You! 
physics
A lizard of mass 3.0 g is warming itself in the bright sunlight. It casts a shadow of 1.6 cm^2 on a piece of paper help perpendicularly to the Sun’s rays. The intensity of sunlight at the Earth is 1.4 x 10^3 W/m^2, but only half of this energy penetrates the atmosphere and ...