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

25,143 results, page 39

### 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)

### 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!

### 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 pull-----find the distance between this ...

### 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 ...

### physics

Europa is one of Jupiter's moons. This moon is in a circular orbit of 6.71x10^8 meters within a period of 3.55 days. What is the mass of Jupiter?

### physics

Europa is one of Jupiter's moons. This moon is in a circular orbit of 6.71x10^8 meters within a period of 3.55 days. What is the mass of Jupiter?

### 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) ...

### 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 ...

### 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 ...

### math physics

A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...

### math physics

A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...

### math physics

A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...

### 9th grade

A person standing on Mars would weigh 38% of his earth weight. What is the Mars weight of a person with an earth weight of 55 kilograms?

### math

an object that weighs 234lb on jupiter weighs 100lb on earth. what would an object that weighs 400 lb on jupiter weigh on earth?

### Earth science

The inner core of the Earth is solid because of increased___________ a.)density and composition b.)density and temperature c.)temperature and pressure d.)pressure and density

### earth science

#16 the inner core of the earth is solid because of increased__________ a> density and composition b> density and temperature c> temperature and pressure d> pressure and density

### Physics

A car travels due east with a speed of 50.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth.The traces of the rain on the windows of the car make an angle of 60 degrees with the vertical. Find the velocity of the rain with respect to (a) ...

### English 1

A common theme for each of these selections is? (A Cub Pilot, Barrio Boy, No Gumption, and I Know Why The Caged Bird Sings) a- to become mature, people must learn important lessons from experience b- to govern well, people in authority must treat young people fairly. c- to ...

### Physics 1

Find the ratio of your weight on the Earth to your weight on the surface of the Earth's Moon. WEarth/WEarth's Moon=

### Physics 1

Find the ratio of your weight on the Earth to your weight on the surface of the Earth's Moon. WEarth/WEarth's Moon=

### science

The mass of the girl in earth is 24kg. What is her mass and weight in moon if the moon's gravity is 1/6 of the earth' gravity?

### Physics

The diameter of the Moon is 3480km. What is the volume of the Moon? How many Moons would be needed to create a volume equal to the Earth? How do you find the volume of the Moon from just the diameter? Also, does anybody know how to figure out the volume of the Earth?

### Physics

he weight of an astronaut on the moon is 127 N, where the value of 'g' is only 1.7 m/s2. What would the weight of this astronaut be on the Earth (in N)? I don't know if my attempt is rite? 127n/1.5ms^2 74.70N Divide 74.70N with earth value of G. What is the earths value of G?

### Science

The largest planets in the solar system are a) located between Earth and Jupiter b)found between Mars and Pluto c) located between the sun and the earth d) scattered througthout the solar system e) none of these e

### science(check answers)

1. A 2. C 3. A 4. D 1. Coal, oil, and natural gas are inexpensive sources of fuel which do not cause pollution when used. A. true B. false 2. One reason people around the world use coal as an energy source is: A. It is nonrenewable. B. it can be found many places C. it is a ...

### writting

anubody can help me for this question? "must create briefing note for any club" tomorrow i must submit to my teacher.

### geography,maths literacy,life-sciences,tourism

What career must I take when doing these subjects or what course must I do at tertiary?

### maths literacy,agriculture, geography,tourism

Which career path must I consider and Where must I go? To a university or FET

### Grade 12 Physics

A rocket ship is moving away from the earth after having been fired from a launch pad in Florida. At what point above the earth's surface will the force of gravity be reduced to ½ of its original value? ------------------ Prior to this question I was given the equations to ...

### English

1. How thick must the ice be for the Eleven Cities Tour? 2. How thick must the ice be to hold the Eleven Cities Tour? 3. How thick must the ice be so that the Eleven Cities Tour take place? - The ice must be at least 15 centimeters thick. ------------------------ What is the ...

### Physics circular motion

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 6.38 106 m, determine the speed and centripetal acceleration of a person situated ...

### 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 ...

### mechanics and heat

At the same instant that a 0.5 kg ball is dropped from 25 m above earth , a second ball , with a mass of 0.25 kg , is thrown straight upward from earth’s surface with an initial speed of 15 m/s . They move along nearby lines and pass without colliding. What is the velocity ...

### 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...

### SCIENCE

Suppose an astronomer oberserves a huge solar flare. Predict its effect on Earth in the next day or so. I put it would break satellites and powercuts would happen. But would a huge solar flare kill all people on Earth? Im not sure

### 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? I got 31.9cm (just need help on part b!) b) If the model is cut in half, how many jars of paint would be needed to paint each half if 1 jar covered ...

### Science I need a teacher's help

Why are capillaries and not arteries or veins found in the alveoli, nephrons, and villi. A. vessels must be small so that very little blood enters these tissues B. vessels must be narrow so that only very small molecules can reach these tissues C. vessel walls must be thin to ...

### Physics, help please!

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.

### Math

Research two satellite phone plans with a specific number of minutes a month. Create a linear equation to represent the monthly bill based on both the flat fee and the per minute cost. Which one is the better option? Why?

### Math

Research two satellite phone plans with a specific number of minutes a month. Create a linear equation to represent the monthly bill based on both the flat fee and the per minute cost. Which one is the better option? Why?

### physics

If an astronaut dropped a small rock near the surface of Pluto, how far (in m) would the rock fall in 1.1 s? (The mass of Pluto is 2.500×10-3 the mass of earth and the radius of Pluto is 0.18 of the earth's radius.)

### physics

If an astronaut dropped a small rock near the surface of Pluto, how far (in m) would the rock fall in 1.1 s? (The mass of Pluto is 2.500×10-3 the mass of earth and the radius of Pluto is 0.18 of the earth's radius.)

### Geometry

A city has a scale model of the solar system nearly 6 km long. The model's scale is 1 km : 1 billion km. a. Earth is 150,000,000 km from the Sun. How many meters apart are Earth and the Sun in the model?

### Math - Algebra

If a man wewighs 41 newtons (N) on the surface of the earth while he weighs 81.5N on the surface of the moon, approximately how much lighter is he on the moon? What would be his weight on the surface of the earth if he weighs 90 N on the surface of the moon?

### English Writing

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... Could you help me? I'm not English speaker so I don't know how can I write continue of these sentences...

### Physics Honors

A car travels due east with a speed of 60.0 km/h. Rain is falling vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 45.0° with the vertical. Find the velocity of the rain with respect to the car and with respect to ...

### Chemistry

How many moles of ozone does the atmosphere hold? For a sense of scale,compare the amount to the total carbon dioxide emitted annually from fossil fuel burning, cement production and deforestation (7900 Tg/C). Given with the facts the amount of ozone is equivalent to a 3mm ...

### Physics

The first stage of a space vehicle consumed fuel and oxidizer at the rate of 1.60 multiplied by 104 kg/s, with an exhaust speed of 2.55 multiplied by 103 m/s. (a) Calculate the thrust produced by these engines. answer should be in N (b) Find the acceleration of the vehicle ...

### physic

golf is just as popular as it is on earth. A golfer tees off and drives the ball 4.5 times as far as he would have on earth, given the same velocities on both planets. The ball is launched at a speed of 54 m/s at an angle of 60¡ã above the horizontal. When the ball lands, it...

### Science

I know what a baseline is, but what baseline is used in astronomy? y do we need vary the length of baselines we use? is it the diameter of the earh's orbit? I really do not get the 2nd part.

### PHYSICS

In the Bohr model of the hydrogen atom, the electron makes 6.00×10^15 rev/sec around the nucleus.What is the average current at a point on the orbit of the electron?

### Physics

A single electron orbits a lithium nucleus that contains three protons (+3e). The radius of the orbit is 1.76*10^-11m. Determine the kinetic energy of the electron.

### physics (Newton"s law of gravitation)

Could anyone please help me 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...

### Physics-Graivty

Suppose planet earth suddenly grew in size, so that its radius was twice as large as before. Also suppose that at the same time, its mass also doubled to twice its former mass. If you weight used to be 700 N, what is it on this "new" Earth. Describe why this is the answer ...

### earth science

which of the following is NOT a major component of soil a)mineral matter b)air c)humus d)earth worms 2) a soils texture is determined by a) mineral composition B)type of humans c)water content d)particle size 3)the main source of organic matter in soil is a)water b)plants*** c...

### math

To pass her English Test, Lucille must get 75% of the items correct. Out of 80 questions, how many must she correctly answer?

### PHYSICS

A Cessna 350 must reach a speed of 35 m/s for takeoff. If the plane accelerates at a steady 3.8 m/s2, how long must the runway be?

### Alg 1

Reasoning: The equation 3x^2 + bx + 3 = 0 has one real solution. What must be true about b? I think it is: b must be the same as -4(a)(c). What are your thoughts?

### physics

how much heat must be added to 4.00 kg of aluminum to cause its temperature to rise from 22 degrees C? unit of answer must be joule

### Physics

Charges q1 and q2 lie on the x-axis at points x= -a and x= +a respectively a) how must must q1 and q2 be related for the net force +Q placed at x= +a/2 to be zero?

### psychology

Which of the following best demonstrates the goal of congnitive therapy? I think therefore I am (maybe) A fool sees not the same tree that a wise man sees A musician must make music an artist must paint a poet must write if he is to be at peace with himself ( maybe) The ...

### Chemistry 2

An industrial chemical reaction has a rate law: rate = k [C]. The activation energy for the reaction is 3.0000 x 10^4 J/mol and A = 2.000 x 10^-3. What must be the reaction temperature if a rate of 1.000 x 10^-9 M/s is required and [C] must be kept at 0.03000M. Hint: What must...

### History

“Without consideration of ‘traditions’ and prejudices, it [Germany] must find the courage to gather our people and their strength for an advance along the road that will lead this people from its present restricted living space to new land and soil, and hence also free ...

### math

Earth exerts a force on an object equal to the objects weight. the object exerts a force on earth I think the answer is it equal zero?

### PHYSICS

AT WHAT DISTANCE ABOVE THE SURFACE OF THE EARTH IS THE ACCELERATION DUE TO EARTH'S GRAVITY 0.980M/S² IF THE ACCELERATION DUE TO GRAVITY AT THE SURFACE HAS MAGNITUDE 9.80M/S²

### Physics

I'm not really sure on this one... Am i correct? A maglev train requires which of the following? A. track and the train must have the different magnetic poles B. track and the train must have the same magnetic poles <--- C. magnetic poles must alternate between the track ...

### physics

A car travels due east with a speed of 35.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 40.0° with the vertical. Find the velocity of the rain with respect to the ...

### physics

At a certain location on the Earth, the horizontal component of the Earth’s magnetic field is 2.5 ·10−5 T due North. A proton moves eastward with just the right speed for the magnetic force on it to balance its weight so the net force on the proton will be zero. Find ...

### 5th grade

one light year is about 9 trillion kilometers . arctus is a star that is 37 light years from earth.if you are 11 years old now,how old will you be when light that is leaving arcturus today reaches earth. how far in kilometers willit have traveled .sow your work.

### Equivalent Algebraic Expressions

The game shown at the right consists of eight pairs of coloured squares called dominos. Rules: 1. Write a polynomial in each square marked P and a rational function in each square marked R. 2. The expressions you write must satisfy each of these conditions: • Polynomials and...

### science

Mars is 48 million miles from earth. If a spaceship leaves Earth traveling toward Mars at 6 million miles per hour (m.p.h.). How long will it take the spaceship to arrive on Mars.

### physics

an object of 3 kg is dropped from 2m above the ground. it takes a time interval of tE to reach the ground of the earth. if it is dropped on the moon, how long does it take to reach the ground? the a dure to g on the moon is 1/6 of that on the earth.

### Physics

An airplane whose air speed is 600 mi/h is flying perpendicularly to jet stream whose speed relative to the Earth's surface is 100 mi/h. What is the airplane's speed relative to the Earth?

### algebra

an astronaut who weighs 85 kilograms on the earth weighs 14.2 kilograms on the moon. how much would a person weigh on the moon if they weigh 95 kilograms on earth? round your answer to the nearest tenth.

### Physics

At the surface of a certain planet, the gravitational acceleration g has a magnitude of 12.0 m/s^2. A 21.0-kg brass bell is transported to this planet. What is (a) the mass of the brass ball on the Earth and on the planet, and (b) the weight of the brass ball on the Earth and ...

### Earth space science, check answers?

A. 75 % B. 12.5% C. 25% D. 3.13% E. 9.38% 3. what percentage of land on the earths surface is inhospital lands? - B 4. what percentage of earths surface is covered by land? - C 5. what percentage of land on earth is usable, for living on, but not for agriculture/farming?-D 6. ...

### College Physics

Although they don’t have mass, photons—traveling at the speed of light—have momentum. Space travel experts have thought of capitalizing on this fact by constructing solar sails—large sheets of material that would work by reflecting photons. Since the momentum of the ...

### Physics

Newton showed that the motion of comets is controlled by gravitational attraction of gravity. Many comets move in elliptical orbit but if they are moving very fast they will perform a hyperbolic orbit. A student attempts to model the hyperbolic trajectory of a fast moving ...

### alegebra

1. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on Earth also varies according to the elevation of the object? In particular, the weight of an object follows this equation: , where C is a constant, and...

### Physics

The space shuttle, with an initial mass M = 2.41×106 kg, is launched from the surface of the earth with an initial net acceleration a = 26.1 m/s^2. The rate of fuel consumption is R = 6.90×103 kg/s. The shuttle reaches outer space with a velocity of vo = 4632. m/s, and a ...

### physics

The first Lunar Olympics is to be held on the Moon inside a huge dome. Of the usual Olympic events - track and field, gymnastics, and so on - which would be drastically affected by the Moon's gravity? In which events would Earth=based records be broken? In which events would ...

### American 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 ...

### Trig

This problem is stumping me, can anyone help me? The Earth rotates every 24 hours (actually 23 hours, 56 minutes and 4 seconds) and has a diameter of 7926 miles. If you're standing on the equator, how fast are you traveling (how fast is the Earth spinning)? Compute this (a) ...

### Physics

1. Gunter, the weightlifter, can lift a 230.0 kg barbell overhead on Earth. The acceleration due to gravity on the sun is 274 m/s2. 2. a. Would the barbells be heavier on the sun or on the Earth. heavier on the sun b. How much (in Newtons) would the barbells weigh on the sun? ...

### Physics

1)The Earth exerts an 710 N gravitational force on a man. What force does the man exert on the Earth? Answer in units of N 2)If a book is sitting on a table, the force of gravity pulls it down. Why doesn’t it fall? Is it because The table is pushing up on it with a force ...

### Physics- Relativity

A lighthouse sweeps its beam of light around in a circle once every 7.2 s. To an observer in a spaceship moving away from Earth, the beam of light completes one full circle every 9 s. What is the speed of the spaceship relative to Earth

### earth science am i right?

am i right 19. According to the law of __________, only a worldwide flood with its vast complex of sediment-saturated currents would produce horizontal superimposed layers of materials, thus forming a great series of sedimentary strata formed in various parts of the earth. X ...

### physics

find the rotational kinetic energy of the earth about the sun due to its orbital about the sun. The mass of the each M is 6 X 10^24 kg, the orbital radius r is 1.5 X 10^11 m and the rotational period T is 1 year. Hint, treat the earth as a point mass in this problem.

### Astronomy

Hi, can you please check my work? I really need to do well on this. 1. What properties of a star are needed to calculate the stars luminosity? a. size and apparent brightness b.mass and distance to the star**** c. temperature and diameter of the star d. apparent brightness and...

### Biology

the eventual evolution of living organisms on earth is based upon the following theory: during the early stages of the earth's history the chemical characteristics of the world changed as the conditions on the planet changed. The changes established the conditions necessary ...

### math

The earth has a radius of 6,380 km. The formula for the volume of a sphere is �� V = 4/3 ðx^3, and the formula for surface area of a sphere is A = 4ðx^2 . Find the volume and surface area of the earth and write the answer in scientific notation with two numbers...

### Biology

I don't know any info an the first semester and midterms are tomorrow please help ( Populations, Communities, and Ecosystems Chemistry of Living Things History of Life on Earth: The First Simple Cells History of Life on Earth: Complex Cells Cells and Their Environment Energy ...

### physics

The polar ice caps contain about 2.76E+19 kg of ice. This mass contributes negligibly to the moment of inertia of Earth because it is located at the poles, close to the axis of rotation. Estimate the change in the length of the day that would be expected if the polar ice caps ...

### physics

how much must a car produce to drive 150 km if an average force of 500 N must be maintained to overcome friction?

### PHYsics 101

How much heat must be added to 4.00 kg of aluminum to cause its temperature to rise from 22°C to 252°C unit of answer must be Joule

### College Physics

On planet Z, the standard unit of length is the foose. Ann the Astronaut is 5.90 feet tall on earth. She lands on planet Z and is measured to be 94 foosi tall. Her partner Rachael is 88 foosi tall. How tall is Rachael on Earth?