Homework Help: Science: Earth

Science
A space probe on the surface of Mars sends a radio signal back to earth a distance of 8.66x0^7 km. Radio waves travel at the speed of light (3:00x10^8 m/s . How many seconds does it take the signal to reach earth

physics
A baseball pitcher throws a baseball with a speed of 48 m/s . In throwing the baseball, the pitcher accelerates it through a displacement of about 3.5 m, from behind the body to the point where it is released how long was it in the air before returning to earth?

Science
A space probe on the surface of Mars sends a radio signal back to earth a t a distance of 8.66 x10*7 radio waves travel at a speed of light 3.00 x 10^8 . How many seconds does it take for it to reach earth

Chemistry 101
The distance from the Earth to the sun is approximately 9.37 x 10^7 miles. How long does it take for light from the sun, to reach the earth? Speed of light is 3.00 x 10^8 m/s. Use dimensional analysis to solve.

science
find the gravitational force exerted by the sun on a 70 kg man located at the earth's equator a)at noon when the man is closest to the sun. b)at midnight when he is futherst from the sun. c)calculate the diferrence in gravitational acceleration due to the sun between noon (a) ...

which of the following features make earth and venus similar to each other ? A . their size and mass b. their rates of rotation c. their atmospheres d. their directions of rotation****

English
The extreme poverty of Dakar, Senegal, in “Hip-Hop Planet” is best reflected in which image? a. “When I looked into his eyes, they were bottomless oceans.” b. “. . . it pulled me to the earth like a hundred-pound ring in my nose.” c. “. . . they take every bit of...

English
The extreme poverty of Dakar, Senegal, in “Hip-Hop Planet” is best reflected in which image? a. “When I looked into his eyes, they were bottomless oceans.” b. “. . . it pulled me to the earth like a hundred-pound ring in my nose.” c. “. . . they take every bit of...

Geography
List 10 countries wich pacfic ring of earth is found.

physics
A person is standing at the edge of the water and looking out at the ocean (see figure). The height of the person's eyes above the water is h = 1.9 m, and the radius of the Earth is R = 6.38 x 106 m. (a) How far is it to the horizon? In other words, what is the distance d from...

Chemistry 101
The distance from the Earth to the sun is approximately 9.37 x 10^7 miles. How long does ti take for light from the sun to reach the earth? Speed of light is 3.00 x 10^8 m/s. Show work.

Chemistry
The petrol, can be represented by the formula of the octane rating, has earth specifies 704 g/L. Estimate the enthalpy variation when burning 28.5 liters of petrol, assuming energies of connection 0 = 0 (117 kcal) C = 0 (173 kcal) 0–H (111 kcal) C–C (83 kcal) C–H (99 kcal).

Math
a satellite traveling in a circular orbit 2000 kilometers above the earth completes one orbit every 3 hours. assume the earth is a sphere and its radius is 6400 kilometers. find the angular velocity of the satellite

Physics (Feilds)
Show that the gravitational potential at the surface of the Earth is -64 MJ kg-1, given the surface gravitational feild strength is 9.8 N kg-1 and the mean radius of the Earth is 6400 km.

Math
a satellite traveling in a circular orbit 2000 kilometers above the earth completes one orbit every 3 hours. assume the earth is a sphere and its radius is 6400 kilometers. find the angular velocity of the satellite

Physics
The mass of a star in a galaxy far, far away, is 2.13 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 7.87 × 108 km. Treating this planet and star as particles, with each mass concentrated at...

Mechanics
A 500kg spaceship is in a circular orbit of radius 2Re above the earth a.how much energy is required to transfer the spaceship to a circular orbit of radius 4Re. b.discuss the change in potential energy,kinetic energy and the total energy of the system

Physics
How does the weight of a body varies on earth surface?

earth science
During the early Paleozoic era, South America, Africa, Australia, Antarctica, India, and perhaps China comprised the vast southern continent of _____. (1 point) Europe Gondwana Laurasia Pangaea

SCIENCE HELP PLS
The density of gas particles in a section of Earth’s atmosphere decreases. Which of the following is the most likely explanation for this event? The air pressure in that section of Earth’s atmosphere decreased. The air pressure in that section of Earth’s atmosphere ...

English
And yet the books will be there on the shelves, separate beings, That appeared once, still wet As shining chestnuts under a tree in autumn, And, touched, coddled, began to live In spite of fires on the horizon, castles blown up, Tribes on the march, planets in motion. “We ...

Physics
The Earth exerts an 640 N gravitational force on a man. What force does the man exert on the Earth? Answer in units of N.

science help
An astronomer sees two stars in the sky. Both stars are equally far from Earth, but the first star is brighter than the second star. Which of the following is a valid conclusion about the first star? It is larger than the second star. It is smaller than the second star. It is ...

English
1.) "Good fences make good neighbours." Spring is the mischief in me, and I wonder If I could put a notion in his head: "Why do they make good neighbours? Isn't it Where there are cows? But here there are no cows. Before I built a wall I'd ask to know What I was walling in or...

Language
People have been making maps for hundreds of years. Christopher Columbus used maps when he sailed to the "New World." At that time, most people thought Earth was flat, and all of the maps they used were flat, too. Of course, Columbus's maps were not accurate, but would you be ...

Math
Earth weight is 5.9736 x 10^24 Kg and Venus is 4.8685 x 10^24 Kg. What is the combined weight of Earth and Venus ? a)10.8421 X 10^26 Kg b)10.8421 x 10^23 Kg c)10.8421 x 10^25 Kg d)1.08421 x 10^25 Kg

Social Studies
Experts argue that a significant water shortage by 2025 will be caused by a. rising ocean levels. b. drastic increase in water usage by humans.*** c. drastic increase in usage by a growing animal population. d. raging, out-of-control wildfires that are spreading throughout ...

physics
An object in space is initially stationary relative to the Earth. Then, a force begins acting on the object, starting with a force of 0 N, and increasing at a uniform rate until the magnitude of the force is 58 N after the force has acted for 25 s. The body has a mass of 10 kg...

Physics
if mars orbits the sun at an angular velocity of 1.06x10-7 rad/s, how long is a year on mars in earth days assuming it travels in a circular orbit?pls explain

Math
Mercury's average distance from the sun is 57,910,000 km. The Earth is approximately 93,000,000 miles from the sun What would be the distance of a trip from Mercury to Earth, via the Sun. Look out for the units!!! (1 km =(0.62mi) Use Scientific Notation to solve this question.

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

mechanics
please help solve these questions (1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re), ...

mechanics
please help solve these questions (1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re), ...

mechanics
please help solve these questions (1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re), ...

physics
(1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re), where Re is the radius of the ...

physics
(1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re), where Re is the radius of the ...

physics
(2). Determine the velocity which a body released at a distance r from the center of the earth when it strikes the earth surface.

Science
Give two reasons why so little is known about organisms from the Precambrian time, even though it was the longest period and early earth's history?

maths
distance around the earth is 4.5x10 ^4 km. whats that in metres?

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

Word problem
earth and cement block filling a box weighs 390mlb.the block weigh 2.4times as much as water and earth weighs 1.5times as much as water.water filling the box weighs 2000lb.find the weigh of the cement block.bl? plz help help help!!!! Show work

physics
It has been suggested that rotating cylinders about 12.5 mi long and 4.88 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth? Answer...

1. Which of the following statements best defines tides? (1 point) when waves get bigger because of an approaching storm the rise and fall of ocean water that occurs about every 12.5 hours the rise of ocean water that occurs 12 times a day a giant wave that can be extremely ...

Science
1.Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? -a solar eclipse -a lunar eclipse -a total lunar eclipse -a penumbra 2.Which of the following statements about a lunar eclipse is true? -A lunar eclipse can occur when the ...

mechanics
please help solve these questions (1a). The gravitational field strength g on the earth’s surface is 9.8N/kg. explain what this means.(b) Using the law of gravity, show that gr2= k. Where g=gravitational field strength at a distance r from the center of the earth (r>Re), ...

math
Formula for distance to the horizon for a satellite in orbit. d = sqrt(2rh+h^2) d = distance to the horizon h = height above sea level for the observer. r = radius of the earth ---------------------------------- Solve for h. ie. so I can plug in d and r and get a solution for h.

Math/Science
Calculate the minimum change in velocity (delta V or ∆V) required for the Space Shuttle to decrease its altitude to 60 miles if it’s orbiting with an apogee of 260 miles and a perigee of 220 miles above the surface of Earth.

dynamics
(a) A rocket is travelling out of the earth’s atmosphere. During flight it burns fuel at a rate of 80kg/s producing a constant thrust of 500kN which drives the rocket in a vertical trajectory. It has a mass of 3500Kg when it reaches a speed of 1220m/s. At this point in the ...

Physics
The radius of the earth's orbit around the sun (assumed to be circular) is 1.50 X 108 km, and the earth travels around this orbit in 365 days. (a) What is the magnitude of the orbital velocity of the earth, in m/s? (b) What is the radial acceleration of the earth toward the ...

Science
How can volcanic eruptions change the surface of the earth? by creating large deposits of coal by creating new islands and land by lowering land levels several feet by decreasing the level of the ocean I think its C

metreology
Wien’s radiation law says that the wavelength of most intense radiation (λmax) emitted by a blackbody is inversely proportional to the absolute temperature (T) of the object. The surface of the Sun radiates as a blackbodyat a temperature ofT=6000 kelvins so that the Sun...

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 :(

Social Stuies
Which of the following does NOT concern dividing up the earth into smaller sections? A. Parallels B. Meridians C. cardinal directions D. Hemispheres

Science
What would happen to ocean tides on Earth if Earth stopped rotating?

Chemistry help
The earth moves round the sun in one year.the average earth-sun distance is 1.5*10^11m given that the mass of the earth is 5.98*10^24kg (a):the angular momentum of the earth??? (b):kinetic energy of the earth motion?? (c):kinetic energu of the earth motion half way along it ...

Social sudies
What was the purpose of the Missouri Compromise? A) It was an attempt to annex new territories from Mexico. B) It was an attempt to abolish slavery in the United States. C) It was passed to force South Carolina to secede from the Union. D) It was an attempt to balance ...

history
all I need is sequence of events of Earth's history for the Mesozoic and Cenozoic eras. just facts that I could put up. I believe the Mesozoic era was the fist one with humans in it? (IN ORDER PLEAEE)

Physics
A person weighs 600 N on Earth. What is the person's mass?

history?
sequence of events of Earth's history for the Mesozoic and Cenozoic eras. I know that the Mesozoic Era is an interval of geological time from about 252 to 66 million years ago. and people also call it the Age of Reptiles, And I know that the Cenozoic Era is the current and ...

math
the scientific notatio of velocity of light velocity of sound distance between the sun and earth

Science
istance of a planet from sun is four times the distance of the planet frpm earth.How many years will the planet take to complete one revolution of sun?

math
An object that weighs about 2.1 pounds on the moon weighed 12.56 pounds on Earth. About how much would an astronaut who weighs 174 pounds on Earth weigh on the moon?

Social Studies
According to Aborigine spiritual beliefs, the Earth is a. a place of unending suffering and pain.*** b. a source of wealth to conquer in the name of one's ancestors. c. an ancient gift of the gods. d. a place where humans were banished from the gods.

Social Studies
According to Aborigine spiritual beliefs, the Earth is (1 point) a. a place of unending suffering and pain.*** b. a source of wealth to conquer in the name of one's ancestors. c. an ancient gift of the gods. d. a place where humans were banished from the gods.

Social Studies
Which of the fallowing is not true about Aborigine culture? a. It is the oldest surviving culture on Earth*** b. Tradition Aborigine societies found agricultural settlements c. Aborigine do not believe that land belongs to humans d. Aborigine groups are spread across the ...

science help PLS
An astronomer sees two stars in the sky. Both stars are equally far from Earth, but the first star is brighter than the second star. Which of the following is a valid conclusion about the first star? It is larger than the second star. It is smaller than the second star. It is ...

Physics
Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 44 kg student to accelerate downward at 9.8 m/s2, determine the upward accelera- tion of the Earth during the student’s fall. Answer in units of m/s2.

science help PLS
Which of the following correctly describes a way in which Earth’s atmosphere interacts with the geosphere? It contains gases that living organisms breathe. It contains gases that trap incoming solar radiation. It provides a medium for cycles that provide nutrients to living ...

Science
What can scientists learn from the rate at which radioactive elements decay? A. a rock's absolute age* B. the relative age of rock layers C. where one soil horizon ends and the next begins D. the difference between molds and casts. The relative age of a rock is A, its age ...

Science HELP PLZ
1. Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse* a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a lunar eclipse is true? (1 point) A lunar eclipse can...

Physics
An astronaut on board a spacecraft is in orbit around the earth in uniform circular motion. Is her velocity speed and acceleration constant?

Physis
The question: You are standing on a large sheet of frictionless ice and holding a large rock. In order to get off the ice, you throw the rock so it has velocity 11.9 m/s relative to the earth at an angle of 36.8∘ above the horizontal. If your mass is 70.5 kg and the rock...

physics
How much would the time keeping of a pendulum clock be affected by taking it to the moon? Gravity is 1.6m/s ^2, compared with 10m/s ^2 on the earth.

Hi, I have this question that I will be tested on but my teacher didn't teach us how to do it so I am confused on how to even start. Please explain on how to start the question...thank you How bright a star appears can depend on how much light the star actually emits and how ...

Ap physics 1
The mass of a star in a galaxy far, far away, is 3.12 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 2.46 × 108 km. Treating this planet and star as particles,with each mass concentrated at ...

science + check over
please check my answers + help me improve them. * 1.) explain why earth & other planets were not solid when they formed during the beginning of the precambrian, approximately 4,600 million years ago + what was this particular time period called & why is this time period not ...

Language Arts
1. Which sentence contains an opinion? (1 point) Thomas Jefferson supported American independence from Great Britain. He was a lawyer in his home state of Virginia. Jefferson authored the Declaration of Independence, the most important document in history.•• He became the ...

Physics
The average speed of an orbiting space shuttle is 19700 mi/h. The shuttle is orbiting about 125 mi above the Earth’s surface. Assume the Earth’s radius is 3963 mi. How long does it take to circle the earth? Answer in units of h.

Science
1. how does earth's rotation cause day and night? (1pt) A.)As the earth rotates toward the east the sun appears to rise in the east and set in the west. B.)As earth rotates towards the east, the sun appears to rise in the east and set in the west C.)Earth rotation does not ...

Physics
2. Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth’s mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth. Show your work. Answer: g= GM/r² G= 6.67 * 10^-11 Nm²/kg² ME= 5.98 * 10^24 kg RE=6.37* 10^7m Ms=...

Earth Science
Compared with dull and rough rock surfaces, shiny and smooth rock surfaces are more likely to cause sunlight to be… my answer is reflected. Am i right?

Earth Science
In recent years, scientists have been concerned about decrease in the ozone content of earth’s upper atmosphere. What is the principle threat to humans if this decrease in ozone continues? My answer is, Decreasing precipitation leading to crop failure and possible human ...

Earth science
What prevents life from developing on land before Earth’s atmosphere contained a significant portion of oxygen? (1) All land locations were too hot for life to exist. (2) All terrestrial environments were too cold for life to even exist. (3) All forms of life require ...

Earth Science
If atmospheric pressure is 30.40 inches of mercury, what is the air pressure in millibars? (1)1016 mb (2)1028.3 mb (3)1029 mb (4)1029.5 mb I think that the answer is either 2 or 4, could you check my answer?

Science
1.)TRUE OR FALSE: Scientific investigations involve testable questions. * True False 2.)Which of the following would not be a reliable place to find research for a scientific investigation? * science journals experts wikipedia textbooks 3.)Why should a scientist reapeat an ...

jay kay public
Consider a planet in space whose mass is twice that of earth and radius is thrice that of earth what will be the weight of a body on this planet if its weight on the earth is 900N ??

Physical science
the space shuttle typically orbits 400 km above the earth's surface.the earth hass a mass of 5.98*10 to the 24 squared kg and a raduis of 6,380 km.A)how much would a 2000 kg part form the space station weight when it has been lifted to that orbit in the shuttle's cargo bay?B)...

physics
On planet X, an object weighs 18.1 N. On planet B where the magnitude of the free-fall acceleration is 1.28 g (where g = 9.8 m/s 2 is the gravitational acceleration on Earth), the object weighs 37.9 N. The acceleration of gravity is 9.8 m/s 2 . What is the mass of the object ...

Physics Help
A dumbbell has a mass m on either end of a rod of length 2a. The center of the dumbbell is a distance r from the center of the Earth, and the dumbbell is aligned radially. If r≫a, the difference in the gravitational force exerted on the two masses by the Earth is ...

Science
1.)Why is Earth’s temperature just right for life? (1 point) A.)Earth’s core is hot enough to heat Earth’s surface. B.)Earth’s magnetic field creates suitable temperatures on Earth’s surface. C.)Earth’s crust is warmed by heat from the sun. D.)Earth’s atmosphere ...

Science
A spring scaled is used to measure the weight of a object on the earth. The scale on the moon would read what?

Physics
A star the size of our Sun runs out of nuclear fuel and, without losing mass, collapses to a white dwarf star the size of our Earth. The radius of our Sun is 6.96×108m , the radius of Earth is 6.37×106m . If the star initially rotates at the same rate as our Sun, which is ...

Earth science
According to the suplimentary demands the price you pay for a product is determine both by its availability and by consumer demand for the product. On the basis of the principle, which mineral do you think have a higher value, iron containing mineral or feldspars? Some one ...

Science
A spring scaled is used to measure the weight of a object on the earth. The scale on the moon would read what?

Science
A spring scaled is used to measure the weight of a object on the earth. The scale on the moon would read what?

Chemistry
the effective incoming solar radiation per unit area on earth is 342 W/M^2. of this radiation, 6.7 W/m^2 is absorbed by CO2 at 14993 nm in the atmosphere. how many photons at this wavelength are absorbed per second in 1 m^2 by CO2?

english
how would you describe some who is crazy to jump from outer space to earth

Chemistry (Gas)
A cylinder is filled with 120L of air at 101 kPa and 20*C. How long could the cylinder be used "just underwater" on earth assuming 2L is used every 5 seconds. I don't understand what the pressure and temperature would be "just underwater." Is it assumed that it is SATP?

physics
The weight of an object on earth is 20 newton if the object put 6400km above from the earth so what was the weight of the object if the radius of earth is 6400 km

Science
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...

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