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

25,380 results, page 78

### Social Impact of Technology

Which of these kinds of energy is a fundamental requisite for life on Earth? A. Electrical energy B. Solar energy C. Chemical energy D. Potential energy An -- C

### Chemistry

A student must make 500 mL of a 1.5 M HCl solution. The student has plenty of water and a stock solution of 6.0 M HCl to use. What volume of the 6.0 M HCl solution must be added to what volume of water to make the desired 500 mL of 1.5 M solution? I don't really know how to ...

### calc

standard equations of circles that have centers on line 5x-2y=-21 and are tangent to both axis. Any ideas?? First express the line as in point slope form y=(5/2)x - 21/2 The center must be on the line, so it is a point expressed as (x,(5/2)x - 21/2) In order for the circle to ...

### Mathematics

A committee of 4 is to be selected from 5 women and 7 men.In how many ways;a)Can this committee be selected? b)Can this committee be selected if 3 men must be included c)Can the committee be selected if at least 3 women must be included?

### earth and space science

Materials, such as water, that becomes gaseous easily at room temperature are called volatiles. How does the complete lack of volatiles in lunar rocks support the impact theory of the moon’s formation?

### science

Very hot, liquid iron and sulfur are found 1,800 miles deep in the earth in the _____.? a) inner core b) mantle c) outer core d) crust Just need to know if my answer or right or wrong. Thanks! :) c

### science

Very hot, liquid iron and sulfur are found 1,800 miles deep in the earth in the _____.? a) inner core b) mantle c) outer core d) crust Just need to know if my answer or right or wrong. Thanks! :) c

### College Algebra

The population of the Earth is approximately 6 billion people and is growing at an annual rate of 1.9%. Assuming a Malthusian growth model, find the world population in 45 years. (Round your answer to one decimal place.)

### Physics

while on the moon, the Apollo astronauts enjoyed the effect of a gravity much smaller than that on earth. if Neil Armstrong jumped up on the moon with an initial speed of 1.51 m/s to a height of 0.700m, what amount of gravitational acceleration did he experience?

### math

An iceberg breaks off from the Antarctic continent and floats due north at constant velocity/ It's latitude south decreases by 1 degree in 8 days. Taking the circumference of the earth to be 40 000km, calculate the speed of iceberg in ms^-1.

### College Chemistry

The sun bombards the earth with about 1KJ m^-2s^-1. Calculate the maximum mass of pure ethanol that can be vaporized in 10 min from a beaker left in strong sunshine, assuming the surface area of the ethanol t be 50cm^2.

### geometry

EARTH COMPLETES ONE FULL ROTATION EACH DAY MAKING THE SUN APPEAR TO RISE AND SET. IF THE SUN PASSES DIRECTLY OVER HEAD, BY HOW MANY DEGREES DOES ITS POSITION IN THE SKY CHANGE EVERY HOUR?

### Physics

A 50-cm wire placed in an East-West direction is moved horizontally to the North with a speed of 2 m/s. The Horizontal and Vertical components of the earth's magnetic field at that location are 25 ìT and 50ìT respectively. What is the emf between the ends of the wire? A) 30...

### Quick science question

In the newspaper one day, you read that the highest tides of the season are expected in the next month. What can you infer about the positions of the Sun, Earth, and the Moon? What phase of the Moon will probably be visible?

### Earth science

13 of the19 lives lost you to the Wichita Andover tornado were at the mobile home park in Andover. Even though there was some advanced warning what could explain the relatively high death toll at this location?

### environmental science

1. which of the below is an example of high-quality matter found near the earth's surface? a. natural gas b. mine tailings c. bauxite (al ore) d. recyclable materials in a landfill e. nitrogen gas in the atmosphere

### english

In An Inconvenient Truth Earth is called the Goldilocks planet because A) The sun is at a balanced distance B) It has a significant wildfire population C) It's neither too hot or too cold for life D) The mineral content, especially cold and gold. I think it's C or A

### Science HELP

Although the Amazon Basin receives more than 80 inches of rain per year, South America also has the driest place on Earth, known as A. Death Valley. B. Gobi Desert. C. Atacama Desert. D. the Caribbean.

### 5th grade science

In the newspaper one day you read that highest tides of the season are expected in the next month. What can you infer about the positions of the sun, earth, and moon? what phase of the moon will probably be visible?

### Geog

In one Minute of time, how does the earth rotate in minutes or seconds of longitude? rotation=360 degrees/ number minutes in the day. 360/1440 = 0.25 is that the right answer

### world geography

the united state has both the wettest and direst places on earth.the wettest is hawaii and the driest is death valley,california.is that means that south america does not has both

### math

At a certain range of depths, the temperature of Earth's interior, in degrees Celsius, is expressed as 10d+20, where d is the depth in kilometres. Determine the temperature at a depth of 15km. I really don't get this, plz help!

### earth science

how do chemical rocks form, are some types of limestone considered a chemical rock, and what mineral does rock salt crystalize from? thank you so much if you choose to answer. im so stumped.

### Physics

What does it mean to say that angular momentum is conserved? Give an example you might see on Earth. How could conservaton of angular momentum help astronomers understand the development of the solar system?

### Physics

What does it mean to say that angular momentum is conserved? Give an example of what you might see on Earth. How could conservation of angular momentum help astronomers understand the development of the solar system?

### Earth Science

To measure the strength of an earthquake, you can use either a______scale or______scale. A)Richter B)seismograph C)mercalli intensity part:2 A)moment magnitude B)seismogram C)mercalli intensity

### PHYSICS

a 17 of model plane is flying at a horizontal speed of 14 m/s the plane goes into a dive and levels off 21 m closer to the earth what was the ammount of potentiomal energy lost in the dive

### Science

What are tides and how are they caused? Tides are the alternate rises and falls of large bodies of water. They are caused by the gravitational interaction between the Earth and the Moon. Please correct me if I'm wrong, thanks

### chemistry

even every air can be changed in to liquid at certain pressure and temperature, why our earth tend to change water at gaseous state to liquid state and by what conditions?

### English

I have to list the verb or verbs. Could someone please check. 1. The plant Venus seems more like Earth in appearance than any other planet does. seems like

### chemistry

An atom has a valence shell configuration of ns2p5. To which group of elements in the periodic table does it belong? transition metals Halogens alkaline earth metals alkaline metal

### chemistry

An atom has a valence shell configuration of ns2p5. To which group of elements in the periodic table does it belong? transition metals Halogens alkaline earth metals alkaline metal

### geometry

what is the maximum broadcasting radio from a radio tower 1800ft tall the radius of earth is 3960 miles and you can assume thtat the ground around the tower is nearly flat

### trig

city A is 300 miles directly north of city B assuming the earth to be sphere of radius 4000 miles determine the difference in latitude in degrees of the two cities

### science

although each place on earth has its own climate,they can be grouped based on certain overall characteristics.what are the keys factors that scientist use to determine the climate of a particular place

### physics

A helicopter is ascending vertically with a speed of 5.03m/s . At a height of 132m above the Earth, a package is dropped from the helicopter. How much time does it take for the package to reach the ground?

### Chemistry

A weather balloon with a volume of 3.86934 L is released from Earth’s surface at sea level.What volume will the balloon occupy at an altitude of 20.0 km, where the air pressure is 10 kPa? Answer in units of L

### Science

If an astronaut could hop 40 cm high on Jupiter, how high could he or she jump on earth? On the moon? Please help me fast I have a bunch of questions over this and I have no idea what this even means

### algebra

the ratio of the weight of an object on jupiter to its weight on earth is 8 to 3. how much would a 100 pound person weigh on Jupiter? i`ll tell you the answer when am done solving so you can check if am right

### physics

Consider a system of a cliff diver and the earth. The gravitational potential energy of the system decreases by 21,000 J as the diver drops to the water from a height of 32.0 m. Determine her weight in newtons.

### math

There were 845 million facebook users in 2011 and 608 million in 2010. What is the percent since Facebook is now used by 1 in every 13 people on earth? is the answer:7.69% 1 x x - - 13 100

### maths

Two places on the same meridian have latitudes 10 degree south and 53 degree north. What is their distance apart measured along the meridian?(radius of the earth R=6400km,pi=22/7)

### History

sequence of events of Earth's history for the Mesozoic and Cenozoic eras. I know That the Cenozoic era was first but I cant find anything on google its not working its saying page has been dispaneded :(

### math

The well is dug 14m deep. Its radius is 2m. The earth dug out is evenly spread out on a rectangular field of dimensions 10m*4m. Find the height of the platform raised.

### physical science

If sam drops a 40 kg mass from a height of 20 meters on earth how much was the potential energy of the mass before he dropped it a-800 j b-784 n-m c-800 n-m d-7840 j e- 200 j

### Math

Rad makes six payments a year of $175.50 for his auto insurance. How much must he budget weekly to cover this fixed expense? a. $20.25 b. $43.88 c. $1,053 d. $87.75 Rod makes six payments a year of $150 for his auto insurance. How much must he budget weekly to cover this fixed...

### Algebra

If you have these three origins: (0,0) (0,952) (863,0) How do you find the last point where the two lines intersect? Would really appreciate the help. Thanks. Parker, I'm not quite sure what the question asks. Three origins? Is this standard analytic geometry we're doing? I ...

### Chemistry

True or false 1. The energy of a collision between atoms or molecules must be greater than the activation energy for bonds to be broken? 2. Decreasing the temperature decreases the kinetic energy of the reactant, and the reaction goes more slowly? 3. two or more atoms must ...

### Science

1. Which of the following is the correct definition of minerals? A) A naturally occurring, inorganic solid that has a crystal shape and definite chemical composition. B) A naturally occurring, inorganic solid that forms through crystallization of melted materials. C) A ...

### BSu Probability

In a multiple choice examination there are 20 question, each question has four alternative answer following it and a student must select one correct answer. Four marks are given for the correct answer and one mark is deducted for every wrong answer. A student must score at ...

### BSu Probability

In a multiple choice examination there are 20 question, each question has four alternative answer following it and a student must select one correct answer. Four marks are given for the correct answer and one mark is deducted for every wrong answer. A student must score at ...

### math

A true-false test consists of 15 items. (b) What is the probability that Chris gets 80% or more for the test? (c) If it is a 25 item true-false test, would you think it is easier or more difficulty for Chris to get 80% or more? (Hint: please calculate the corresponding ...

### Physics helppp

Figure 5-53 shows a man sitting in a bosun's chair that dangles from a massless, frictionless pulley and back down to the mans's hand. The combined mass of man and chair is 94 kg. Fig. 5-53 With what force magnitude must the man pull on the rope if he is to rise (a) with a ...

### Biology

23. Since DNA sequences in humans and chimpanzees are very similar a. humans must have evolved from chimpanzees b. chimpanzees must have single-stranded DNA c. humans and chimpanzees must have a recent common ancestor d. humans and chimpanzees are the same biological species ...

### Physics

A hydraulic lift in a garage has two pistons: a small one of cross-sectional area 3.70cm2 and a large one of cross-sectional area 210cm2 . Part A If this lift is designed to raise a 3100-kg car, what minimum force must be applied to the small piston? Part B If the force is ...

### 7 Science

If earth was larger what would happen to it's atmosphere? It would expand It would evaporate It would be sucked into space It would become more dense

### Earth Science

How can a metamorphic rock change into another type of metamorphic rock?

### Science

what is the source of the energy in the greenhouse? what is the source of energy entering Earth's atmosphere?

### 10th grade

Which planet has the gravitational force that is closest to Earth's gravitational force?

### physics

why does saturn have smaller density than earth and mars which is smaller than saturn?

### physics

Can water,air and earth conduct electricity? If yes, then explain how they conduct electricity.

### Physics

Knowing the temperature at the surface of the Earth to be 72 F, find the temperature at the surface of Venus.

### discrete math

Fill in the blanks: For all sets A and B, if A is in the set of B, then A union B in in the set of B. Proof: Suppose A and B are any sets and A in in the set of B. [we must show that __________] Let x be and element of _______. [we must show that __________] by definition of ...

### college physics

To stretch a spring 7.00 cm from its unstretched length, 16.0 J of work must be done. What is the force constant of this spring? What magnitude force is needed to stretch the spring 7.00 cm from its unstretched length? How much work must be done to compress this spring 4.00 {\...

### communication styles

The importance of communication in the field of criminal justice. Benefits of using a particular communication styles. And the importance of the communication process in law enforcement. could you critique this for me. The importance of communication in the field of criminal ...

### Technology

A boy who weighs 30 kilograms sits on one end of a seesaw. On the other end there is a girl who weighs 20 kilograms. The girl is 1.5 metres from the fulcrum. How far from the fulcrum must be the boy sit in order to balance the seesaw? How far away must the boy sit if the girl ...

### Chemistry help emergency? (theoretical mass/mol)

I am supposed to calculate the theoretical mass and moles of Cu. However I am given the mass of 2 reactants in the balanced equation: 3CuCl2*2H2O + 2Al -> 3Cu + 2AlCl3 + 6H2O I am given the mass of CuCl2*2H2O to be 0.477g and the mass of Al is 0.267g. If I wanted to ...

### French (URGENT #2)

Can someone please help check my work? There were no instructions, it is as I have written it. Am I supposed to choose only one? or more? 1. On peut pratiquer les sports décrits dans cette annonce... info: SPORTS. Cercle. Nautique. Martinique. Ski nautique - Planche à voille...

### math

I am a positive integer less than 100. two more than my value is a multiple of 6. the sum of my digits is a multiple of 7. I must show all my work This kind of problem can't be solved by writing and solving one or two equations. You have to use "trial and error" to see what ...

### World History Summary Ideas *Help*

My assignment is to write a magazine article about an archaeologic site. It must be dated in the Paleozoic era, the article I must write only has to be a page long. There must be atleast two pictures and I must site references. Any ideas on a lesser know site that I could ...

### medicine

What are 10 things that Electroneurodiagnostic Technicians must know?

### physics

What must a muscle do in order to do work?

### English

Why is leadership something you must continue?

### math

__X+3___ is an integer, than X must be? 2

### Math Algebra

f(x)=x^3+4 f=1, f=-1 Are the answer to this 5 and 3 I must not understand

### chemistry

If we have a solution in which the [OH -] = 3.3 x 10-4, then the [H3O+] must be

### psychology

to gain acceptance,a hypothesis must be.

### Algebra1

If -1<t<0, which of the following statements must be true? a. t^3<t<t^2 b. t^2<t^3<t c. t^2<t<t^3 d. t<t^3<t^2 e. t<t^2<t^3

### Little help with math?

48.03 / 7 = What? I don't get this You must put it to repeat

### Science

How often must a tractor be serviced?

### math

f(x)=-7/x-9 What number must be excluded from the domain and why?

### mathematics

√s<s, which of the following must be true? a. s=1 b. 0<s<1 c. s=0 d. s>1 e. s>s^2

### us history

how often must congress meet? why?

### MAT 116

If a > 0 and b < 0, then which of the following must be true

### Math

If a square is a kite it must have?

### Science

How many cell must a fungi have?

### Math

What must be added to 40 to make 10 by powers of 2 ?

### math

what must be added tox2+10x+23

### Math

2x^3 + x^2 - 5= 0 x=? What is the process I must do in order to get the answer?

### Conceps of development

Which of the following is the crux of the interrelationship between mathematics and science? A. About half of the basic math concepts are related to science concepts. B. The basic concepts of mathematics are the basic process skills of science. C. Basic mathematics process ...

### concept development

Which of the following is the crux of the interrelationship between mathematics and science? A. About half of the basic math concepts are related to science concepts. B. The basic concepts of mathematics are the basic process skills of science. C. Basic mathematics process ...

### algebra 1

snookers lumber can convert logs into either lumber of plywood. in a given day, the mill turns out three times as many units of plywood as lumber. it makes a profit of $20 on a unit of lumber and $50 on a unit of plywood. how many of each unit must be produced and sold in ...

### physics help plz thanks

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...

### physics need help plz

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...

### Geography

What two methods are used to represent features on the earth? On a physical map, shades of black to light gray or various colors can show elevations. On three-dimensional maps and globes, the mountains are raised slightly above the oceans.

### physics

In a gas at standard temperature and pressure, what is the length of the side of a cube that contains a number of molecules equal to the population of the earth (about 6 million people at present)? I know STP is 1 atm and 273K, but I have no clue how to start this problem. Any...

### science

The movement of the earth around the sun____. a) is one of the reasons for seasons b) results in the formation of day and night c) makes the sun rise in the east d) causes earthquakes e) cause the ice ages to reoccur Just need to know if my answer or right or wrong. Thanks! :) a

### science

Scientists believe that the waters covering the surface of the earth? a) are not visible from space b) are slowly drying up c) first appeared during the age of dinosaurs d) are a recent addition to our planet e) have been here since the crust solidified

### science

scientists believe that the waters covering the surface of the earth. a)are a recent addition to our planet b) first appeared during the age of dinosaurs c) have been here since the crust solidified d) are slowly drying up e) are not visible from space c