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

25,143 results, page 11

### mathematics

two parallel chords lie on opposite sides of the centre of a circle of radius 13cm.thir lengths are 1ocm and 24cm.what is the distance between the chords

### physics

You are working at a garden centre for the summer. You lift a bag of fertilizer with a force of 143 N, and it moves upward with an acceleration of 0.762 m/s2. a: how much does the fertilizer back weigh?

### Physics (Astronomy)

Hi, what keeps objects in orbit, for example, preventing the moon from crashing into the earth under the force of gravity? I have read that it speeds up as it gets closer to earth but I don't understand why. Can someone help me? Thanks.

### physics

mercury rotates about its own axis once every 58.6 Earth days. a satellite orbits mercury once every murcurian day. how high is this satellite above mercury's surface? mass of mercury = 3.2x10^23 kg. the radius of mercury is 2400km.

### chemistry

I got E) for the first and couldn't figure out the other one. Can any one verify the first and help with the second?? In which of the following processes is there a decrease in the potential energy of the substances involved? A) a coil spring is compressed B) two particles of ...

### Maths

Find the length of an arc of a circle of radius 5.6cm which subtends an angle of 60°at the centre of the circle of the circle take pie 22 divided by 7

### physics

suppose the moon were held in its orbit not by gravitational interaction with the Earth but by a long, mass-less cable attached to the center of the earth. What would be the tension in the cable?

### physics

the moon orbits the earth in a circle (near enough) of radious 3.8x10^8 m, taking 27.3 days to make a complete orbit. what is the speed of the moon relative to the earth?

### physics

every year the earth travels on its orbit about the sun. What is earth average speed in m/s, taken that the average orbital radius in 93,200,000 miles

### Physics-moment of inertia PLEASE HELP

this is the question : A CD has a diameter of 12.0 cm and a mass of 15.8 g. The motor in a CD player causes the disk, initially at rest, to spin. When in operation, the CD spins in such a way that the laser scans the tracks at a constant tangential velocity of 1.20 m/s. The ...

### Physics

I'm having trouble with this question. Some __ objects emit no visible light but are known through __ and radio images; satellite observations __ Earth's atmosphere help scientist study space at wavelengths that do not reach Earth's surface. If you can answer it, I would ...

### Physics

On July 19, 1969, Apollo II's orbit around the moon was adjusted to an average orbit of 111km. The radius of the moon is 1785 km and the mass of the moon is 7.3e22 kg. a) How many minutes did it take to orbit once? b) At what velocity did it orbit the moon?

### Physics 1 - Mechanics

You are making a trip in a space shuttle, and your friend Jimmy is in another space shuttle. He shares the same circular orbit with you, which is 420 km above the Earth, but he is 21 km ahead of you. (a) How long will it take you to catch up with your friend if you reduce your...

### Physics

Suppose a circular platform is rotating at a constant rate of 24 rev/min. How far away from the centre would one need to stand in order to have an radial acceleration of 9.9 m/s2? Express your answer in cm.

### physics

The moment of inertia of thin uniform rod of mass i and length L about an axis passing through a point midway between the centre and on end perpendicular to its length is --------------

### Physics

Three particles X, Y, and Z of masses 2 kg, 5 kg, and 4 kg respectively are arranged in order along a straight line. Y is 5.0 m from X and 7.0 m from Z. The distance of the centre of mass of the system of mass from X is? ANS: 6.6 m Help please? I don't even know how to start :(

### French

The class that you exchange e-mail messages with in France is interested in learning about teen's shopping habits in north America. Write a short paragraph describing where you and your friends like to shop and what you like to wear at school. Tell how much these items cost ...

### ap physics

Suppose that Superman wants to stop Earth so it does not rotate. He exerts a force on Earth F⃗ SonE at Earth's equator tangent to its surface for a time interval of 1 year. The mass of Earth is 5.98×1024kg, the radius is 6.37×106m. Assume that Earth is a solid sphere with ...

### physics

The earth moves around the sun in a nearly circular orbit of radius 1.50*10^11m. During the three summer months (an elapsed time of 7.89*10^6s), the earth moves one-fourth of the distance around the sun. (a)what is the average speed of the earth? (b) what is the magnitude of ...

### physics

Suppose a spherical planet P has a uniform density of 4.96*10^3 kg/m^3 and a radius R=1904 km. For a parcel that weighs 73 N on the surface of the (spherical) earth, what is A) gp/ge and B) its weight on the surface of P? Using the "tunnel mail" system what is C) the delivery ...

### Electromagnetic spectrum

Some astronomical objects emit no visible light but are known through (blank?) and radio images; satellite observations (blank?) Earth's atmosphere help scientists study space at wavelengths that do not reach Earth's surface?

### Science

The electric field due to a charged conducting sphere of radius 10 cm , at a distance of 20 cm from the centre of the sphere is 1.5*10pow3 NC-1 and points radially inwards.what is the charge on the sphere ?

### physics

A satellite orbits Earth once per day. From the reference frame of the Moon, which orbits Earth once about every 27 days, what is its motion?

### physics

the polar-orbiting environmental satellites (POES) and some military satellites orbit at a much lower level in order to obtain more detailed information. POES complete an Earth orbit 14.1 times per day. What are the orbital speed and the altitude of POES?

### physics

Find the rotational kinetic energy of the earth about the sun due to its orbit about the sun. The mass of the earth M is 6 x 1024 kg, the orbital radius r is 1.5 x 1011 m and the rotational period T is 1 year. Treat the earth as a point mass in this problem.

### physics

Find the rotational kinetic energy of the earth about the sun due to its orbit about the sun. The mass of the earth M is 6 x 1024 kg, the orbital radius r is 1.5 x 1011 m and the rotational period T is 1 year. Treat the earth as a point mass in this problem

### physics

The hydrogen atom consists of a proton with an electron in orbit about the proton. The laws of quantum mechanics determine that the radius of this orbit is 5.29x10^-11 meters. Therefore, calculate a) The electric potential the electron experiences. b) The next available orbit ...

### Physics

What is the orbital velocity of the Earth around the Sun, assuming the Earth takes a perfectly circular orbit around the Sun? What would be the centripetal acceleration of the Earth around the Sun? (I have no clue :() From my textbook I found out that Earth has a mass of 5....

### physics

the moment of inertia of a thin uniform rod of mass M and length L about an axis passing through a point midway between the centre and one end perpendicular to its length is -----------------------------------

### problem solving

Given that • The distance from the earth to the sun is 1.5*10^11m, and • The mass of the sun is 1.9 *10^30 kg , 1. use Kepler’s Law of Periods to find the period of the earth’s orbit, recorded in seconds:; 2. show how to express your answer in years; and 3. if your ...

### Astronomy

The Hubble Space Telescope orbits at an altitude of 600 km above the Earth's surface. Assuming it is in a stable circular orbit, what is its velocity? For reference, the Earth's radius is 6400 km and Earth's mass is 6 x 10^24 kg. The formula to solve for circular velocity is v...

### math

) RSTU is a cyclic quadrilateral in a circle of centre O.If RUT is 40°, what are the two values of <ROT (convex and concave)? (b) A RHC has a triangular catchment’s area PQR such that PQ = 22.1Km; PR = 13.5Km and <RPQ =56°. Find <PRQ.

### math

(a) RSTU is a cyclic quadrilateral in a circle of centre O.If RUT is 40°, what are the two values of <ROT (convex and concave)? (b) A RHC has a triangular catchment’s area PQR such that PQ = 22.1Km; PR = 13.5Km and <RPQ =56°. Find <PRQ.

### science

a satellite in force free space sweeps stationary interplanetary dust at a rate of dM/dt=alpha v, where M is mass and v is speed of satellite and alpha is a constant. the tangential acceleration of satellite

### physics

The planet Jupiter has a satellite, Io, which travels in an orbit of radius 4.220×108 m with a period of 1.77 days. Calculate the mass of Jupiter from this information.

### Physics(Please respond)

A satellite has a mass of kg orbits the Earth in a circular path with radius 1.0e^7m. What is the period of the satellite? I think I already posted this but I am still confused. My teacher said to use T= 2(pi)r^3/2 / sqrt GmE So I just plugged the numbers in T= 2(pi)(1.oe^7)^3...

### maths

the circle is given by the equation x^2+y^2+8x-7/2y=0 find (i)coordinates of the centre and the radius (ii)coordinates of the point where the circle crossesthe x-axis

### math

the area of a circle PQR with centre O is 72 cm square. what is the area of sector POQ if angle POQ is equal to 40 degree?

### physics

According to Kepler's third law, the orbital period T of a planet is related to the radius R of its orbit by T2 R3. A planet's orbit is larger than Earth's by a factor if 3.39. What is the planet's orbital period?

### Motion Problems

A satellite which travels around the earth has a power supply that provides power according to the formula: P =(17200)/(t + 100) where t is the number of days the satellite is aloft. Find the rate at which power is decreasing after 380 days. rate in watts/day (enter as a ...

### physics # 6

6. Which object listed below is not accelerating? a.) A person standing on the surface of the Earth. b.) A satellite in geostationary orbit. c.) A jet traveling at Mach 6.7 in a straight line. d.) A child standing on a merry-go-round. e.) A block oscillating on a spring when ...

### Science

At the distance of the earth from the sun the pressure exerted by sunlight is avout 10^-5 Pa How much force does this pressure exerted on 10m^2 array of solar cells on a satellite when the array is perpendicular to the direction of the sunlight? If the satellite has a mass of ...

### Physics

At the distance of the earth from the sun the pressure exerted by sunlight is avout 10^-5 Pa How much force does this pressure exerted on 10m^2 array of solar cells on a satellite when the array is perpendicular to the direction of the sunlight? If the satellite has a mass of ...

### Physics

Consider the earth following its nearly circular orbit (dashed curve) about the sun.(Figure 2) The earth has mass mearth=5.98×1024kg and the sun has mass msun=1.99×1030kg. They are separated, center to center, by r=93millionmiles=150millionkm. What is the size of the ...

### maths

the area of the union of squares with side 1cm whose centre lies on a fixed square with side 1cm is equal to what ?.

### math circle geometrics

The distance of a chord from the centre of a circle of radius 7cm is 5cm,what is the length of the chord to the nearest centimetre?

### maths

Qpqr is a rhombus ,3 of whose vertices lie on the circle with centre o .if the area of the rhombus is 32 root 3 find the radius of the radius

### math

PQ and RS are 2 parallel chords of a circle such that PQ = 8 cm & RS = 6 cm. If the chords are on the opposite sides of the centre and distance between them is 4 cm. find the radius of the circle

### geometry

a point moves so that its distance from the origin is twice its distance from the point (3,0) show that the locus is a circle and find its centre and radius

### Math

An arc of a circle subtends an angle of 54 at the centre. If the arc is 9cm long, calculate the circumference of the circle.

### math

On average, the earth is 93 million miles away from the center of the sun. The complete revolution around the sun takes 1 year. how fast is the earth moving in this orbit in feet per second?

### physics

Given that the Moon's period about the Earth is 27.32 days and the distance from the Earth to the Moon is 3.84*10^8 m estimate the mass of the Earth. Assume the orbit is circular. Why do you suppose your estimate is high? The force of attraction= centripetal force G MeMm/d^2=...

### physics

two small kids weighing 10kg and 15kg are trying to balance on a seesaw of total length 5 m with the fulcrum at the centre. if one of the kids is sitting at an end where should the other sit?

### English

1.Read the following lines from the poem "At the Tourist Centre in Boston" is this a manufactured hallucination, a cynical fiction, a lure for export only? Which of the following words best describes the speaker's tone?

### English

Please check this! The diction of "at the tourist centre in boston" can best be described as.. A. Emotionally charged B. Colloquial and relying on slang C. Informal and simple D. Mostly figurative I don't think it's C or D? My best guess is A.

### physics

A comet orbits the Sun with a period of 71.8 yr. (a) Find the semimajor axis of the orbit of the comet in astronomical units (1 AU is equal to the semimajor axis of the Earth's orbit). (b) If the comet is 0.50 AU from the Sun at perihelion, what is its maximum distance from ...

### Circle geometry

A chord is 6.0 cm from the centre of a circle of radius 10 cm. How long is the chord to the nearest tent of a centimeter???

### childcare

In what ways can a child care centre program provide quality care for the child caregivers.

### maths

A chord is 2cm from the centre of a circle. if the ratius of the circle is 5cm, find the length of the chord

### math

The area of circle PQR with centre O is 72cmsquared.what is the area of sector PQR,if POR =40squared

### Physics

The planet Mars has a satellite, Deimos, which travels in an orbit of radius 2.346×107 m with a period of 1.26 days. Calculate the mass of Mars from this information.

### mechanics

The planet Mars has a satellite, Phobos, which travels in an orbit of radius 9.378×106 m with a period of 0.32 days. Calculate the mass of Mars from this information

### Physics: Astronauts and space

When out in space in International Space Station (ISS), Astronauts experience weightlessness. The ISS’s orbit is 354 km (that is 3.54 x 105 m) above the surface of the earth.The distance separating the center of the earth from the center of the ISS is then approximately ...

### Calculus

Conic Sections- A point moves so that its distance from the origin is twice its distance from the point (3,0). Show that the locus is a circle, and find its centre and radius.

### math

A painted dot on the circumference of the wheel is 12cm from the centre of rotation of the wheel. How far does the dot travel in 5 sec., to one decimal place?

### Calculus - urgent

An isosceles triangle is inscribed in a circle of fixed radius R and centre O. What is the minimum area of the region outside the triangle and inside the circle?

### math

the diagram shows a square xyrz of side 15m with an inscribed circle centre o.calculate the area of the square, circle and the shaded region

### Physics

The mass of an object at the earths surface is 100 kg. Calculate the force of gravity of the same mass if it is moved a distance of 4 radii from the earths centre.

### Maths

chords PQ And RS Intersect At X Inside The Circle Centre T.If Angle PTR=64 Degree And The Minor Arc PR Is Twice The Minor Arc QS.Calculate QXS

### English

I changed my name to Henry1 because other students have chosen Mike, Mike 1. As you suggested to me, I chose five sentences. Thank you. 1)The trip showed me that there is a big world outside.I decided to take (??) the trip to keep my family good company. 2) We stopped several ...

### science

The Earth is a satellite of the sun? If not can you tell me what it is?

### Physics

What is the speed of a geosynchronous satellite on Earth?

### engr

the spacecraft is first put into a circular orbit around Mars. The period of the orbit is 110 minutes. Calculate the altitude of the orbit in km.

### Physics

A 21.0-kg satellite has a circular orbit with a period of 2.37 h and a radius of 8.50×106 m around a planet of unknown mass. If the magnitude of the gravitational acceleration on the surface of the planet is 7.10 m/s2, what is the radius of the planet? Use Kepler's third law...

### Physics

Earth's moon is 3.8 X 10 8 m from the planet and is in freefall. Acceleration due to the Earth's gravity acting on the moon is 2.70X 10 -3. What is the moon's speed? How long does it take to make a complete orbit?

### math

A rocket is stopped 12 feet from a satellite when it begings accelerating away from the satellite at a constant rate of 12 feet per second. The distance between the rocket and the satellite is given by the polynormial P(t)= 6t^2+12. Find the distance between the rocet and the ...

### Algebra URGENT! Conic sections

A spacecraft is in a circular orbit 150 kilometers above Earth. Once it attains the velocity needed to escape the Earth's gravity, the spacecraft will follow a parabolic path with the center of Earth as focus. Suppose the spacecraft reaches escape velocity above the North Pole...

### Physics - Grade 12

I've been doing extra questions for physics, but these four are still giving me trouble. Please help me solve them, including Free Body Diagrams if possible. 1. If a curve with a radius of 60m is properly banked for a car traveling at 60km/hr, what must the coefficient of ...

### English - Theme

What is the theme of Margaret Atwood's At the Tourist Centre in Boston? I am having a hard time figuring this out. I need to write about the theme of this poem for an essay question.

### math (need help badly)

the vertices of triangle DEF are D(5,12)and E(2,7) and F(8,4) Triangle DEF undergoes an enlargement with the centre ,O, and scale factors k.Its image is D`E`F` where D(5,12)arrow D`(7.5,18) a)How do i detremine the value of k

### special relativity

A projectile of rest mass M1, total energy E1, and momentum p1, is directed at a stationary target of mass m2. Find the the velocity of the centre-of-momentum frame .

### physics

a roller whose diamater is 1.0m.weight 360N.what horizontal force is necessary to pull the roller over a brick 0.1m,heigh when the force is applied at the centre?

### circles

OPQR is a rhombus , three of whose vertices lie on a circle with centre O.If the area of the rhombus is 32 root 3cm square ,find the radius of the circle.

### maths

OPQR is a rhombus , three of whose vertices lie on a circle with centre O.If the area of the rhombus is 32 root 3cm square ,find the radius of the circle

### Science physic

What is the magnitude of the average force thet the athele exterts on a landing pad if it's 1.5 m high and deforms by 0.5 Mass of athele= 60kg Centre of mass is 1m

### Maths

If O is the centre of the circle and the area of sector OAPB is 5/18 of the area of circle . Find angle.

### Maths

The length of a chord of a circle of radius 10 cm is 12 cm. Some the distance of the chord from the centre of the circle.

### Algebra

Radio signals travel at a rate of 3*10^8 meters per second. How many seconds would it take for a radio signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height of 4.2*10^7 meters? (Hint: Time is distance divided by speed.) a. 1.26*10^...

### Physics

The asteroid EROS has a mass of 7.4x10+15kg. A 103kg astronaut stands on the surface, 33km from the centre of the asteroid. What weight does she experience ? Give your answer in Newtons. Take the Gravitational constnat, G, to be 6.67x10-11.

### earth

planet is in circular orbit around the Sun. Its distance from the Sun is 2.9 times the average distance of Earth from the Sun. What is the period of this planet, in Earth years?

### Physics

A rocket has put your spacecraft in a circular orbit around Earth at an altitude of 350 km. Calculate the force due to gravitational between the Earth and the spacecraft in N if the mass of the spacecraft is 2450 kg.

### Math

A satellite which travels around the earth has a power supply that provides power according to the formula: P = 17200/t + 100 where t is the number of days the satellite is aloft. Find the rate at which power is decreasing after 380 days. rate in watts/day (enter as a positive...

### Physics

A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal force of the ground ...

### Physics

A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal force of the ground ...

### Physics

A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal force of the ground ...

### mathematical physics

Using Divergence theorum evaluate the flux integrate from s vector A.vector D's where A =xi^+yj^+zk^ and s is the complete surface of the hemisphere which has its centre at the origin and the origin and a radius of 6 units.

### Math

The distance, "d", to the horizon (= farthest point on the earth still visible) for an object that is "h" miles above the surface of the earth is given the formula d = the square root of 8000h +h^2. Determine how many miles above the surface of the earth is an orbiting ...

### Physics Urgent!!!!!

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such that Earth lies on a...

### Physics

A satellite is orbiting the earth at a distance of 1.00 x 10^3 km. What is its speed?