Tuesday
May 21, 2013

# Homework Help: Science: Earth

physics
On Planet Y, the value of g is 12 m/s/s. If the human weighs 685 N on this planet, then how much woud he weigh on earth?
Wednesday, September 12, 2012 at 9:00pm

chemistry
If the sun is 150,000,000 km away, how many minutes does it take light to travel from the sun to the earth? Assume light travels at a speed of 3.0x10^10 cm/sec
Wednesday, September 12, 2012 at 5:27pm

AP Biology
1.Oparin and Haldane hypothesized that the Earth's early atmosphere was strongly (2 points) acidic. oxidizing. reducing. ~~ ionic. 2.The most significant outcome of the Miller and Urey experiments was that they (2 points) synthesized living cells from nonliving matter. ...
Wednesday, September 12, 2012 at 4:06pm

physics
Find the magnitude and relative direction (e.g., NE, NW, SE, SW) of the velocity of an airplane relative to the earth, if the velocity of the airplane relative to the air is 165 km/hr. south to north and the wind velocity is 65 km/hr. at an 50o angle from east to west.
Tuesday, September 11, 2012 at 10:14pm

Physics
If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 2.35 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2? b) (b) Repeat for Mars, where the acceleration due to gravity is...
Tuesday, September 11, 2012 at 8:28pm

earth science
A swimmer completed the 1,500 meter freestyle in 625 seconds. What was his average speed?
Tuesday, September 11, 2012 at 5:45pm

English
I have to analyze John F. Kennedy's inaugural address. I need to find the thesis, preview statement (forecasting or signposting), because statement (why the audience might be interested in listening), transitions, a restatement of thesis, and a clincher. Here is the text ...
Monday, September 10, 2012 at 6:36pm

Biology 1
Briefly describe the basic characterisitics that all living things on Earth have in common.
Monday, September 10, 2012 at 6:07pm

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.
Monday, September 10, 2012 at 5:18pm

geography
Will you check my answers for me? 1. How many states are part of the contiguous United States? 48 states 2. Is the Tropic of Cancer north or south of the equator? North of the Equator 3. What are the names of the Earth's continents? North America, South America, Antarctica...
Monday, September 10, 2012 at 5:14pm

electric engineering
An aircraft has a wing span of 56 m. It is flying horizontally at a speed of 900 km/hr and the vertical component of earth’s magnetic field is 0.4 m Wb/m2. Calculate the P.D between the wing tips of the air craft
Monday, September 10, 2012 at 2:50pm

Chemistry
What does the reaction of alkaline earth metals with water tell you? Thanks in advance.
Sunday, September 9, 2012 at 3:03pm

Physics
What is the speed of the rocket when it is 350 above the surface of the earth? A rocket starts from rest and moves upward from the surface of the earth. For the first 10 of its motion, the vertical acceleration of the rocket is given by a(y)=2.9, where the -direction y+ is ...
Sunday, September 9, 2012 at 12:39pm

physics
a boy throws a stone straight upward with an initial speed of 15 m/s on the surface of the earth. what maximum height above the starting point will the stone reach before falling back down?
Saturday, September 8, 2012 at 10:58am

earth science
What are 10 facts about hurricane Isaac?
Friday, September 7, 2012 at 7:02pm

world geography
Where on Earth? which of the 12 northern eurasian cities will be the home of your company's newest restaurant? hint: use information from an atlas and al almanac to eliminate all but one city
Friday, September 7, 2012 at 12:11am

earth
how long will it take Uranium-238 for there to ne 25% of the original radioactive period to be left? i need this question answered ASAP!!!!!(:
Thursday, September 6, 2012 at 9:05am

earth
The weight (V) of an object on Venus varies directly as its weight (E) on Earth. A person weighing 120 lb on Earth would weigh 106 lb on Venus. How much would a person weighing 180 lb on Earth weigh on Venus?
Wednesday, September 5, 2012 at 2:50pm

Math
A year on Mars is 686 Earth Days. (1) Which is longer, a year on Mars or a year on Earth? (2)By how many weeks is it longer? Submit two answers. Please explain how you got the answers. My 1st answer was Mars the 2nd answer I 82 1/2 weeks. Please help
Wednesday, September 5, 2012 at 10:59am

math
A year on Mars is 686 Earth Days. (1) Whicch is longer, a year on Mars or a year on Earth. (2) By how many weeks is it longer? Please explain how you got the answer. My answer was 82 1/2 weeks longers
Tuesday, September 4, 2012 at 9:33pm

Science
If on earth you weigh 420 newtons, and the gravitational pull on the moon is 1/6 of what it is on earth. What would be your weight on the moon?? Please show work Thanks!! :)
Tuesday, September 4, 2012 at 8:46pm

physics
A red ball is thrown down with an initial speed of 1.2 m/s from a height of 25.0 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 22.9 m/s, from a height of 0.8 meters above the ground. The force of ...
Monday, September 3, 2012 at 8:39pm

college
A blue ball is thrown upward with an initial speed of 19.8 m/s, from a height of 0.5 meters above the ground. 2.4 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 7.9 m/s from a height of 22.5 meters above the ground. The force of ...
Monday, September 3, 2012 at 7:33pm

physics
if the radius of the earth is 6.37 times 10 to the third power in km, what is the speed in km/h resulting from the rotation of earth of a person standing on the equater. then, convert the answer to m/s.
Friday, August 31, 2012 at 3:08pm

Math
The earth is approximately a sphere. It's diameter is about 12730km. Water covers approximately 66% of the earths surface. How many square kilometers of land covers the earths?
Friday, August 31, 2012 at 1:36am

Physics
The sun is 1.40•10^11m away and light travels at 3.00•10^8m/s. Calculate how long it takes light from the sun to reach the earth. Express your answer in scientific notation.
Tuesday, August 28, 2012 at 3:25pm

Physics
The sun is 1.40•10^11m away and light travels at 3.00•10^8m/s. Calculate how long it takes light from the sun to reach the earth. Express your answer in scientific notation.
Tuesday, August 28, 2012 at 3:24pm

Physics
The sun is 1.40•10^11m away and light travels at 3.00•10^8m/s. Calculate how long it takes light from the sun to reach the earth. Express your answer in scientific notation.
Tuesday, August 28, 2012 at 3:24pm

Physics
The sun is 1.40•10^11m away and light travels at 3.00•10^8m/s. Calculate how long it takes light from the sun to reach the earth. Express your answer in scientific notation.
Tuesday, August 28, 2012 at 3:23pm

physics
A red ball is thrown down with an initial speed of 1.0 m/s from a height of 27.0 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 24.5 m/s, from a height of 0.7 meters above the ground. The force of ...
Monday, August 27, 2012 at 8:38pm

physics
A helicopter is ascending vertically with a speed of 4.50 m/s. At a height of 195 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the helicopter's.]
Monday, August 27, 2012 at 8:01pm

physics
if an object weighs 6 kgs on earth, what will it's weight be on mars
Monday, August 27, 2012 at 1:39pm

earth
The radius of the Earth is approximately 6370 km. If one could dig down straight towards the center of the Earth, one would find that the outermost 2890 km (the crust and the mantle) has an average density of about 4.5 g/cm3. Farther down is the core. If the average density of...
Sunday, August 26, 2012 at 11:23pm

math
a building cast a shadow approximately 130 ft long on the street when the suns ray form an 82.9 degree angle with the earth. how tall is the building? 180-82.9-90= 7.1 degree tan 7.1 = x/130ft x= 16.19ft is this correct? thanks!
Sunday, August 26, 2012 at 10:42pm

world history
with the adoption of hristianity by constantine, the emperor a. stopped using images of pagan gods b. was no longer worshipped as a god c. ended pagan rituals and ceremonies d. was called God's deputy on earth
Sunday, August 26, 2012 at 4:01pm

Biology
1. Which of the following is the definition of ecology? the social movement with a goal to protect the environment the recycling of human-made materials to reduce waste going into landfills the study of interactions among organisms and between organisms and their environment ...
Friday, August 24, 2012 at 4:06pm

Math (Trig/pre-calculus)
some stars are so far away that their position appear fixed as earth orbits the sun. other stars, however, appear over time to shift their positions relative to the background of "fixed" stars. suppose that the star shown below appears to shift through an arc of ...
Thursday, August 23, 2012 at 9:52pm

Calculus
The percentage of the moon's surface that is visible to a person standing on the Earth varies with the time since the moon was full. The moon passes through a full cycle in 28 days, from full moon to full moon. The maximum percentage of the moon's surface that is ...
Thursday, August 23, 2012 at 7:18pm

Science, Astrenomey
This is my theory, read well if you wish to know the truth: according to the big bang, there is a equal amount of anti-matter to the matter, BUT nearly all that matter is missing! In this theory there was NO anti-matter when the earth was made. anti-matter is made when ...
Thursday, August 23, 2012 at 9:45am

math
the force of gravity varies inversely as the square of the distance between the centers of the two masses. If an object weighs 500 pounds at a distance of 12,000 miles from the center of the earth, at what distance will the weight be 50 pounds
Sunday, August 19, 2012 at 2:13am

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.
Wednesday, August 15, 2012 at 7:25pm

Chemistry
Strong sunshine bombards the earth with about 1 kJ.m-2.s-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 to be 50.cm 2 .
Wednesday, August 15, 2012 at 5:11pm

Physics
A canoe has a velocity of 0.400 southeast relative to the earth. The canoe is on a river that is flowing at 0.450 east relative to the earth.
Monday, August 13, 2012 at 11:38am

earth
A satellite has a mass of 5.98*10^24 kg.if this satellite is t be placed into a circular orbit 300km above the earths surface,what speed,period and radial acceleration must it have
Monday, August 13, 2012 at 2:52am

earth
A distant galaxy is simultaneously rotating and receding from the earth. As the drawing shows, the galactic center is receding from the earth at a relative speed of uG = 1.7 x 106 m/s
Tuesday, August 7, 2012 at 8:07pm

physics
Two pellets, each with a charge of 1.0 microcoulomb (1.0×10−6 ), are located 4.0 (4.0×10−2 ) apart.A)find the electric force between them B)What would be the mass of an object that would experience this same force in Earth's gravitational field?
Monday, August 6, 2012 at 3:04pm

english
please organize these into a paragraph ;astronaauts supposed to rest for eight hours, but too excited to rest ;astronauts easily hopped high because moon has less gravity than earth ;opened spaceship door 61/2 hours after landing ;brought back to earth some moon rocks and soil...
Sunday, August 5, 2012 at 8:43am

math
If a satellite completes an orbit 820 miles above the earth in 11 hours at a velocity of 22,000 mph, how long would it take a satellite to complete an orbit if it is at 1400 miles above the earth at a velocity of 36,000 mph? (Use 36,000 miles as the radius of the earth. )
Saturday, August 4, 2012 at 7:32pm

Physics
The intensity of sunlight at the the top of the Earth's atmosphere is about 1350 W/m2. (The intensity at the surface of the Earth is somewhat smaller due to absorption and reflection by the atmosphere.) What is the total power emitted by the Sun?
Tuesday, July 31, 2012 at 8:13pm

Earth Science
I need help with the following Lab due tonight, 7/30/12, as I feel completely lost and would appreciate the help. The lab goes as follows: Design an experiment that illustrates the determination of the density of a cylindrical object found in the Lab Kit. Prepare a dynamic ...
Monday, July 30, 2012 at 4:22pm

Earth science
of the three "local winds" types discussed in the text book, which do you think could be most easily harnessed for the generation of electricity by a huge wind farm?
Sunday, July 29, 2012 at 8:41pm

Physics
Assume the Earth is a perfect sphere of radius 6,400 kilometers. Find the weight of a 75.0 kg person at the North pole. Find the weight of this same person at the equator. (You don't need to use Newton's Law of Gravitation but you do need to analyze the radial/...
Thursday, July 26, 2012 at 11:59am

math
The earth is approx. a sphere. Its diameter is about 12 730 km. Water covers approx. 66 percent of the earths surface. How many square kilometres of land covers the earth?
Tuesday, July 24, 2012 at 12:36pm

PHYSICS HELP!
IMAGINE- a building 6400km. high. On the ground floor, a person weighs 175lbs when he steps on a spring scale how much would the man weigh on the same scale if he were standing at the top floor? HINT: Note that 6400km is also the radius of the earth so that the top floor is ...
Tuesday, July 24, 2012 at 12:08pm

Math - Trigonometry
The Earth travels in a circular orbit around the Sun at 29.79 km/sec. If the radius of the orbit is 1.496 x 10^8 km, what is the angular velocity in radians/sec? (Round to three significant digits.)
Monday, July 23, 2012 at 10:43pm

PHYSICS!
IMAGINE- a building 6400km. high. On the ground floor, a person weighs 175lbs when he steps on a spring scale how much would the man weigh on the same scale if he were standing at the top floor? HINT: Note that 6400km is also the radius of the earth so that the top floor is ...
Monday, July 23, 2012 at 7:08pm

IMAGINE- a building 6400km. high. On the ground floor, a person weighs 175lbs when he steps on a spring scale how much would the man weigh on the same scale if he were standing at the top floor? HINT: Note that 6400km is also the radius of the earth so that the top floor is ...
Monday, July 23, 2012 at 7:04pm

Math - Trigonometry
The Earth travels in a circular orbit around the Sun at 29.79 km/sec. If the radius of the orbit is 1.496  108 km, what is the angular velocity in radians/sec? (Round to three significant digits.)
Monday, July 23, 2012 at 6:44pm

On the moon, the downward acceleration dur to gravity is only about one-sixth as large as it is on earth. if a 16 kg rock is put on a spring scale on the moon. What would the scale read? Give your answer in newtons.
Monday, July 23, 2012 at 12:53pm

Physic
The tidal interaction between the Earth and the Moon has caused:
Sunday, July 22, 2012 at 10:23pm

Physic
While surface conditions differ greatly, name the three ways that Venus and Earth are indeed sister planets.
Sunday, July 22, 2012 at 10:18pm

physics
when an object is 100m above the surface of earth. The earth's attraction for it is 10N. In order then the earth's attraction on the same object is only 5N. how far should be taken to object be away from surface of earth.
Sunday, July 22, 2012 at 3:48am

Physics
A spacecraft approaching the earth launches an exploration vehicle. After the launch, an observer on earth sees the spacecraft approaching at a speed of 0.74c and the exploration vehicle approaching at a speed of 0.98c. What is the speed of the exploration vehicle relative to ...
Friday, July 20, 2012 at 5:20pm

IMAGINE- a building 6400km. high. On the ground floor, a person weighs 175lbs when he steps on a spring scale how much would the man weigh on the same scale if he were standing at the top floor? HINT: Note that 6400km is also the radius of the earth so that the top floor is ...
Friday, July 20, 2012 at 4:03pm

Physics
IMAGINE- a building 6400km. high. On the ground floor, a person weighs 175lbs when he steps on a spring scale how much would the man weigh on the same scale if he were standing at the top floor? HINT: Note that 6400km is also the radius of the earth so that the top floor is ...
Thursday, July 19, 2012 at 7:12pm

Physics
A comet orbits the Sun with a period of 72.0 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 0.60 AU from the Sun at perihelion, what is its maximum distance ...
Wednesday, July 18, 2012 at 11:49pm

Physics
The force of gravity on the moon is said to be 1/6th of that on the earth .what would be the mass of 12kg weighed on the surface of the earth and moon
Wednesday, July 18, 2012 at 9:22am

astronomy
Which of the following is not a reason why winter is cold? The sunlight strikes the Earth at a glancing angle to the surface. ]There are fewer daylight hours in the winter. The nights are longer in the winter. The Earth is farther from the Sun in the winter.
Sunday, July 15, 2012 at 7:29pm

astronomy
You must show your work for full credit.) Calculate the circular speed of an object that orbits the Sun at a distance of 5.2 AU (1 AU = 1.5e+11 meters, the distance between the Earth and the Sun)
Sunday, July 15, 2012 at 7:27pm

Astronomu
1. There is a common misconception about why the Earth is cold in the winter and warm in the summer. Some believe that this is because the Earth, in its elliptical orbit, is closer to the Sun in the summer and farther away in the winter. The argument is that being closer to ...
Sunday, July 15, 2012 at 6:11pm

earth
if n the diameter of the earth is 19.7Mm , what is in cm
Saturday, July 14, 2012 at 7:50pm

Geometry
Earth has a radius of about 12,500 km. If the volume of the earth were to remain the same, but the shape of the earth was a cube, what would be the approximate length of one side of the cube? A.)12,500 km B.)15,240 km C.)20,150 km
Saturday, July 14, 2012 at 5:49pm

earth
You are standing on a planet with a radius 10,000kilometers. It's mass is 10^26 kg. What is the planet's escape velocity from where your standing? Ignore rotation of the planet.
Friday, July 13, 2012 at 1:02pm

physics
A cylinder with a radius of 15 km is built in space for use as a space station. This cylinder is rotating about its long axis to generate ‘artificial gravity’. When people walk on the inner surface of the spinning cylinder, the normal force between their feet and ...
Thursday, July 12, 2012 at 1:35pm

physics
A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.
Tuesday, July 10, 2012 at 8:41pm

College Physics
A charged cloud system produces an electric field in the air near Earth's surface. A particle of charge -2.1 x 10-9 C is acted on by a downward electrostatic force of 4.3 x 10-6 N when placed in this field. (a) What is the magnitude of the electric field? (b) What is the ...
Sunday, July 8, 2012 at 9:37pm

Physics
You are explaining why astronauts feel weightless while orbiting in the space shuttle. Your friends respond that they thought gravity was just a lot weaker up there. Convince them and yourself that it isn't so by calculating the acceleration of gravity 248 km above the ...
Sunday, July 8, 2012 at 7:39pm

Physics
Suppose the space shuttle is in orbit 430 km from the Earth's surface, and circles the Earth about once every 93.2 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g, the gravitational acceleration at the Earth&#...
Sunday, July 8, 2012 at 6:08pm

Physics
Calculate the velocity of a satellite moving in a stable circular orbit about the Earth at a height of 2600 km.
Sunday, July 8, 2012 at 5:54pm

Science
According to science, the fastest speed posssible for anything is the speed of light. The speed of light is about 186,000 mies per second. That means taht in one minute, lighttravels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from ...
Sunday, July 8, 2012 at 4:37pm

Earth Science
Which of the following does NOT occur at a subduction zone? A. The leading edges of both plates are bent downward. B. Oceanic crust is pushed down into the mantle. C. One oceanic plate moves into another oceanic plate. D. One continental plate moves into an oceanic plate.
Friday, July 6, 2012 at 4:09pm

English
What is the meaning of "Once you have flown, you will walk the earth with your eyes turned skywards, for there you have been, and there you long to return."?
Friday, July 6, 2012 at 11:59am

physical science
The acceleration of gravity on the surface of Venus is 8.9 m/s2. Would a ball thrown upward on Venus return to the ground sooner or later than a ball thrown upward with the same speed on the earth?
Thursday, July 5, 2012 at 10:52pm

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 ...
Thursday, July 5, 2012 at 9:22pm

earth
How long would it take a brown dwarf star, five times the size of the Earth, to travel 450 light years, at 3500 mph?
Thursday, July 5, 2012 at 10:21am

Physics
The value of acceleration due to gravity (g) on a point 10,000 kilometers above sea level is about 1.49 meters/second2. How much will an object, which weighs 98 newtons on the surface of Earth, weigh on this point? The value of acceleration due to gravity on Earth is 9.8 ...
Wednesday, July 4, 2012 at 6:01pm

Engineering Physics
At a location 4Re away from the center of the Earth, you release a 2kg object from rest. How fast is the object traveling when it is 2Re away from the center of the Earth? Re = 6.4 x 10^6 m Me = 6 * 10^24 m
Monday, July 2, 2012 at 10:39pm

science
a boat heading due north crosses a wide river with speed of 12km/h relative to the water the water in the river has a uniform speed of 5 km/h due east relative to the earth.determine the velocity of the boat relative to an observer standing on either bank and the direction of ...
Sunday, July 1, 2012 at 5:17am

Physics
A comet orbits the Sun with a period of 72.0 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 0.60 AU from the Sun at perihelion, what is its maximum distance ...
Saturday, June 30, 2012 at 11:51pm

Physics
Speed of a satellite orbit (physics problem)? What is the speed of a satellite in a geosynchronous orbit about Earth? _________m/s Compare it with the speed of the Earth as it orbits the Sun. _________m/s
Friday, June 29, 2012 at 2:40pm

Physics
Consider points on the Earth's surface as sketched in the figure below. Because of the Earth's rotation, these points undergo uniform circular motion. Compute the centripetal acceleration at the following points.
Friday, June 29, 2012 at 1:03pm

physics
A comet orbits the Sun with a period of 72.8 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 0.55 AU from the Sun at perihelion, what is its maximum distance ...
Thursday, June 28, 2012 at 8:50pm

Chemistry 2
Chlorine atoms contribute to the destruction of the earth's ozone layer by the following sequence of reactions: Cl + O3 --> ClO + O2 ClO + O --> Cl + O2 Where the O atoms in the second step come from the decomposition of ozone by sunlight: O3 --> O + O2 What is ...
Thursday, June 28, 2012 at 2:28am

earth science
Which of the following is a biotic factor in an ecosystem? a.trees b.wind c.Precipitation amount d.sun light
Wednesday, June 27, 2012 at 9:11pm

physics
Locate the position of a spaceship on the Earth-Moon center line such that, at that point, the tug of each celestial body exerted on it would cancel and the craft would literally be weightless. What is the distance (in m from the moon)
Wednesday, June 27, 2012 at 6:13pm

earth
The quantity of radiation received by earth from the sun is 1.4 kW / m2. Assuming that sun is an ideal radiator, calculate the surface temperature of the sun. The ratio of the radius of earth's orbit to the radius of the sun is 216.
Wednesday, June 27, 2012 at 8:36am

Physics
The Moon causes tides because the gravitational force it exerts differs between the side of the Earth nearest the Moon and that farthest from the Moon. Find the difference in the accelerations toward the Moon of objects on the nearest and farthest sides of the Earth. (The mass...
Tuesday, June 26, 2012 at 6:02pm

Physics
Suppose a new extrasolar planet is discovered. Its mass is double the mass of the Earth, but it has the same density and spherical shape as the Earth. How would the weight of an object at the new planet's surface differ from its weight on Earth? (Let Wnew be the weight of ...
Tuesday, June 26, 2012 at 5:50pm

WSU PHY
The Moon causes tides because the gravitational force it exerts differs between the side of the Earth nearest the Moon and that farthest from the Moon. Find the difference in the accelerations toward the Moon of objects on the nearest and farthest sides of the Earth. (The mass...
Tuesday, June 26, 2012 at 1:51pm

PHSC
In a simulation on earth,an astronaut in his space suit climbs up a vertical ladder.On the moon,the same astronaut makes the same climb.In which case does the gravitational potential energy of the astronaut change by a greater amount?
Tuesday, June 26, 2012 at 11:33am

Physics
The Moon orbits the Earth at a distance of 3.85 x 108 m. Assume that this distance is between the centers of the Earth and the Moon and that the mass of the Earth is 5.98 x 1024 kg. Find the period for the Moon's motion around the Earth. Express the answer in days. The ...
Monday, June 25, 2012 at 10:03am

physics
The radius of the moon is one fourth and its mass is one eighty first that of the earth. If the acceleration due to gravity on the earth's surface is 9.8meter per square. What is its value on the moon's surface?
Sunday, June 24, 2012 at 5:03pm

Physics
An object is released from rest at height h above the surface of the Earth, where h is much smaller than the radius of the Earth. It takes t seconds to fall to the ground. At what height should this object be released from rest in order to take 2t seconds to fall to the ground...
Saturday, June 23, 2012 at 9:41am

The atmosphere on Mars is almost all carbon dioxide (CO2), and has a pressure of about 6.9×102 Pa, much less than that of Earth. At −22°C (a warm day on Mars), what is the mass of one cubic meter of the atmosphere? (Assume the atmosphere is completely CO2.) I ...
Friday, June 22, 2012 at 11:11am

maths
the radius of our plant earth is about 6400 km how far is it around the equator
Wednesday, June 20, 2012 at 9:37pm

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...
Wednesday, June 20, 2012 at 7:55pm

A satellite of mass 500kg orbits the Earth in a circular path with radius 1.0e^7 m . 1) What is the period of the satellite? I know that the equation is T= 2(pi)r^3/2 / sqrt GmE mE = 5.98e^24 does G = 6.67e^-11 ??
Wednesday, June 20, 2012 at 11:42am

earth
please give me some important tips about a topic 'tiger in trouble'. I have to prepare a chart on this.
Wednesday, June 20, 2012 at 4:47am

physics
Two Earth satellites, A and B, each of mass m = 960 kg, are launched into circular orbits around the Earth's center. Satellite A orbits at an altitude of 4500 km, and satellite B orbits at an altitude of 13600 km. a) What are the potential energies of the two satellites? b...
Monday, June 18, 2012 at 7:42pm

physics
Jupiter's gravitational field at the surface is approximately three times that of the earth. A person weighing 120 lb. on the earth's surface would weigh how much on Jupiter?
Sunday, June 17, 2012 at 7:32pm

physics
an object weighs 3 lb. at 10 earth radii from its center. What is the object's weight on the earth's surface?
Sunday, June 17, 2012 at 5:47pm

physics
what is the weight of a 3.0 kg object on the surface of the earth?
Sunday, June 17, 2012 at 5:46pm

Physics
How much energy is required to move a 900 kg object from the Earth's surface to an altitude twice the Earth's radius?
Sunday, June 17, 2012 at 3:13pm

Physics
How much energy is required to move a 900 kg object from the Earth's surface to an altitude twice the Earth's radius?
Sunday, June 17, 2012 at 3:06pm

Physics Gravity
A projected space station consists of a circular tube that will rotate about its center (like a tubular bicycle tire) as shown in the figure . The circle formed by the tube has a diameter of about 1.1-km What must be the rotation speed (revolutions per day) if an effect equal ...
Saturday, June 16, 2012 at 5:32pm

Physics Gravity
The earth has a mass = 5.98 X 10^24 kg and the sun has a mass = 1.99 X 10^30 kg. They are separated, center to center, by r= 93 million miles = 150 million km. What is the size of the gravitational force acting on the earth due to the sun? Very confused by this problem. May ...
Saturday, June 16, 2012 at 5:26pm

Physics
Assuming that the Earth is spherical and recalling that latitudes range from 0° at the Equator to 90° N at the North Pole, how far apart, measured on the Earth's surface, are Copenhagen (55.67° N latitude), and Rome (41.90° N latitude)? The two cities lie ...
Friday, June 15, 2012 at 9:23pm

Physics
What is the centripetal acceleration of the Moon? The period of the Moon's orbit about the Earth is 27.3 days, measured with respect to the fixed stars. The radius of the Moon's orbit is RM = 3.85 · 108 m.
Thursday, June 14, 2012 at 11:04pm

Physics
Calculate the force of the Earths gravity on a spacecraft 12,800 km (2 earth radii) above the Earths surface if its mass is 1350 kg?
Thursday, June 14, 2012 at 5:34pm

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)
Thursday, June 14, 2012 at 5:15pm

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 ...
Thursday, June 14, 2012 at 12:02pm

Grammar
Do i need to capitalize the word everlasting? ------> The everlasting God, the Lord, the Creator of the ends of the earth, fainteth not, neither is weary. WHY and Do i need to capitalize the word everlasting? Please help.
Wednesday, June 13, 2012 at 9:27pm

algebra
If a pine cone is projected upward at a velocity of 16ft/sec from the top of a 96-foot pine tree, then how long does it take to reach the earth?
Wednesday, June 13, 2012 at 9:48am

Earth Science
How old is the Gneiss in Greenland?
Tuesday, June 12, 2012 at 10:28pm

physics....
1) Yellow light that has a wavelength of 560 nm passes through two narrow slits that are 0.300 mm apart. An interference pattern is produced on a screen 160 cm distant. What is the location of the first-order maximum? 2) A communication satellite is orbiting 36 000 km above ...
Tuesday, June 12, 2012 at 8:54pm

Earth Science
Which of the following processes helps to shape the landforms of Earth? - Mass movement - Glaciers - Wind - All of the above
Tuesday, June 12, 2012 at 6:53pm

Physics
Find the magnitude of the gravitational attraction force that the earth exerts on a 62-kilogram astronaut who is 8.00 X 10^7 meters away from the center of the earth. Useful numbers: M^earth=5.98 X 10^24kg; G=6.67 X 10^-11 N*m^2kg^-2 Please walk me through your steps, don'...
Monday, June 11, 2012 at 2:53pm

Geosynchronous satellites orbit the Earth at an altitude of about 3.58×10^7 m. Given that the Earth's radius is 6.38×10^6 m and its mass is 5.97×10^24 kg, what is the magnitude of the gravitational acceleration at the altitude of one of these satellites? ...
Saturday, June 9, 2012 at 12:49pm

Chemistry
A cublic meter of ocean water contains 6x10^-5 g of gold. If the total mass of the water in Earth's oceans is 4x10^20 kg, how many kilograms of gold are distributed throughout the ocean? (Assume that the density of seawater is 1 g/cm3.) How many literes of seawater would ...
Tuesday, June 5, 2012 at 2:49am

Physics
How far is the center of mass of the Earth-Moon system from the center of the Earth? The Earth's mass is 5.97×1024 kg, the Moon's mass is 7.4×1022 kg, and the distance between their centers is 3.8×108 m.
Monday, June 4, 2012 at 12:57pm

English
i not get what this poem mean it be a ballad but i not get what theme be do the guy girl be in strong bond? True Thomas lay on Huntlie bank; A marvel he did see And there he saw a ladye bright Come riding down by the Eildon Tree. Her skirt was o' the grass-green silk, Her ...
Sunday, June 3, 2012 at 10:32pm

Physics
A rotating space station has radius 1270 m, measured from the center of rotation to the outer deck where the crew lives. What should the period of rotation be if the crew is to feel that they weigh one-half their Earth weight? I got 101.1 seconds... is this correct? Please help!
Sunday, June 3, 2012 at 11:06am

islam
In the Quran the sky is referred to as-sama’,as-samawat & as-sama ad-dunya. a.What is the best definition of the three terms mentioned that is given by mufassirs b.What is their relationship between each other? c.What would each of the term refer to, in our present ...
Friday, June 1, 2012 at 6:33am

Early Childhood Education
The correct definition of the term aesthetics is A.sensing and gaining beauty and wonder from the environment. B. looking at the earth with a utilitarian purpose in mind. I think it's A. Please help
Thursday, May 31, 2012 at 5:58pm

Physics
Calculate the force on an electron (qe = -1.6 x 10^-19 C) in each of the following situations: a.) moving at 2.0% the speed of light and perpendicular to a 3.0 T magnetic field b.) 3.0 x 10^-6 m from a proton c.) in Earth's gravitational field at the surface of Earth
Thursday, May 31, 2012 at 1:39pm

Physics
Calculate the force on an electron (qe = -1.6 x 10-19 C) in each of the following situations: a.) moving at 2.0% the speed of light and perpendicular to a 3.0 T magnetic field b.) 3.0 x 10-6 m from a proton c.) in Earth's gravitational field at the surface of Earth
Thursday, May 31, 2012 at 1:38pm

earth
A particle weighs 120 N on the surface of the earth. At what height above the earth's surface will its weight be 30 N? Radius of the earth = 6,400 km.
Thursday, May 31, 2012 at 11:31am

Earth Science
Environmental Sustainability” refers to the ______________ of vital human ______________ support systems. fill in the blank
Wednesday, May 30, 2012 at 1:31pm

physics
What is the radius of a communications satellite’s orbital path that is in a uniform circular orbit around Earth and has a period of exactly 24.0 hours (86,400 seconds). (Measurement is from the center of Earth.) G = 6.67 × 10-11 N.m2/kg2 ME = 5.98 × 1024 kg 1...
Wednesday, May 30, 2012 at 10:39am

PHYSICS
A straight 1.2 m length iron rod is moved at 10 m/s through the earth's magnetic field at a location where it has magnitude 1.0 × 105 T. What is the magnitude of the induced emf between one end of the wire and the other end? What formula do I use?
Sunday, May 27, 2012 at 4:10pm

Physics
1.(a) Explain the term time dilation. (b) Show that an interval of time observed in a moving frame of reference will be less than the same interval of the observed in a stationary frame of reference. 2. A rocket was found to be 150m when measured on earth. It then leaves and ...
Saturday, May 26, 2012 at 7:15am

Physics
1.(a) Explain the term time dilation. (b) Show that an interval of time observed in a moving frame of reference will be less than the same interval of the observed in a stationary frame of reference. 2. A rocket was found to be 150m when measured on earth. It then leaves and ...
Saturday, May 26, 2012 at 7:13am

CUC
1. A rocket was found to be 150m when measured on earth.It then leaves and move at a constant velocity of 2 x 10m/s. What is its new length? 2. Two spaceships A and B are moving in opposite directions, A with a speed of 0.9c while B with a speed of 6c. Find the relative ...
Saturday, May 26, 2012 at 5:42am

An astronaut stands at a position on the Moon such that Earth is directly overhead and releases a Moon rock that was in her hand. (c) What is the gravitational force exerted by the Earth on the same 2.7-kg rock resting on the surface of the Moon? answer in mN I keep ...
Friday, May 25, 2012 at 4:38pm

Earth Science
If you started with 100 grams of Potassium-40 how much would reamin Potassium-40 after 3.9 x 10 to the 9th years?
Friday, May 25, 2012 at 3:13pm

Science
Suppose we allowed each person 1000m^3 of living space in a large building, with ceiling height 3 m. To the nearest order of magnitude, how many 1000m high buildings would have to be built to house the entire population of 8.5 x 10^14 people on the energy-limited Earth, if ...
Friday, May 25, 2012 at 11:31am

geometry
Earth has a diameter of approximately 8000 miles. Jupiter's diameter is approximately 88000 miles. How many times greater is the volume of Jupiter than the volume of Earth?
Wednesday, May 23, 2012 at 4:00pm

physics mc question!!!!HELP
Question # 1 : It a particle increases its speed by a factor of 2, what happens to the kinetic energy? a)doubles b)cuts in half c)increases by a factor of 4 d)depends on whether or not work is done on the particle Question # 2: An object falling near the surface of the Earth a...
Tuesday, May 22, 2012 at 8:01pm

Science
A man has a mass of 66kg in the Earth. What is his weight?
Tuesday, May 22, 2012 at 7:51pm

Marine Biology
Surface currents are created by wind and the Earth's rotation. What creates deep water currents?
Tuesday, May 22, 2012 at 9:35am

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