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April 24, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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physics
Using Newton's Law of Universal Gravitation, compare the gravitational pull of the Sun on the Earth to the gravitational pull of the Moon on the Earth. Constants: Mass of the Moon, M☽= 7.348E22 kg. Moon's semi-major axis, a☽= 3.844E8 m. You can find the ...
Wednesday, November 16, 2011 at 6:35pm

Algebra II
The force of attraction between the earth and some object is called the weight of that object. The law of gravitation states, then, that the weight of an object is inversely proportional to the square of its distance from the center of the earth. If a person weighs 120 lb on ...
Wednesday, November 16, 2011 at 12:24pm

Physics
The average intensity of sunlight at earth's surface is approximately 1400 W/m^2 , if the Sun is directly overhead. The average distance between the earth and the sun is 1.50E11 m. What is the average power emitted by the Sun? Ok so intensity is power over area. so power ...
Tuesday, November 15, 2011 at 9:29pm

world history
With the adoption of Christianity by Constantine, the emperor A. stopped using images of pagan gods. B. ended pagan rituals and ceremonies. C. was no longer worshipped as a god. D. was called God's deputy on Earth. im not sure its it B or D
Tuesday, November 15, 2011 at 8:27am

Physics please help
How far from the center of the Earth (in km) is the center of mass of the Earth + satellite system if the satellite has a mass of 6560 kg and is in orbit 46200 km above the surface of the Earth. The mass of the Earth is 5.98 * 10^24 kg and the radius of the Earth is 6370 km.
Monday, November 14, 2011 at 8:49pm

Science
What is 1 energy from the Earth?
Monday, November 14, 2011 at 6:20pm

astronomy
At an average opposition, the Earth and Mars are separated by 0.52 AU. Suppose an astronomer observes Mars at opposition and that seeing blurs the images to a resolution of 1.0 seconds of arc. What is the smallest surface feature the astronomer would be able to resolve on Mars...
Monday, November 14, 2011 at 4:56pm

Astronomy
The distance between the Earth and Mars when the two panets are at opposition varies greatly because of the large eccentricity of Mar's orbit. The perihelion distance of a planet is given by rmin=a(1-e)and the aphelion distance by rmax=a(1+e) where a is the semimajor axis ...
Monday, November 14, 2011 at 4:53pm

Physics help!
How far from the center of the Earth (in km) is the center of mass of the Earth + satellite system if the satellite has a mass of 6560 kg and is in orbit 46200 km above the surface of the Earth. The mass of the Earth is 5.98 * 10^24 kg and the radius of the Earth is 6370 km
Monday, November 14, 2011 at 3:00pm

Physics
Find the centripetal accelerations at each of the following points due to the rotation of Earth about its axis. (a) a point on the Equator of Earth ? m/s2 (b) the North Pole ? m/s2
Monday, November 14, 2011 at 12:24pm

Physics
It has been suggested that rotating cylinders about 9 mi long and 5.1 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? ? rad/s
Monday, November 14, 2011 at 12:17pm

physics
It has been suggested that rotating cylinders about 9 mi long and 5.1 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?
Monday, November 14, 2011 at 12:02pm

Advanced Functions
The earth rotates on its axis once every 24 hours. How long does it take Earth to rotate through an angle of 4(pi)/3?
Monday, November 14, 2011 at 10:17am

Math
A star is 300 light years away from Earth. If the speed of light is 3 X 10^5 km/s, calculate the distance the star is from Earth. Give your answer in kilometers and written if standard form.
Friday, November 11, 2011 at 8:09pm

science
how much less is the gravity on the lunar surface than on earth?
Thursday, November 10, 2011 at 10:24pm

Physics
A communications satellite with a mass of 450 kg is in a circular orbit about the Earth. The radius of the orbit is 2.9×10^4 km as measured from the center of the Earth. Calculate the weight of the satellite on the surface of the Earth Calculate the gravitational force ...
Wednesday, November 9, 2011 at 4:33pm

Physics
Suppose a planet is discovered orbiting a distant star with 13 times the mass of the Earth and 1/13 its radius. How does the escape speed on this planet compare with that of the Earth? Ve new ------- = ve earth
Wednesday, November 9, 2011 at 4:03pm

Physics
Suppose one of the Global Positioning System satellites has a speed of 4.50 km/s at perigee and a speed of 3.52 km/s at apogee. If the distance from the center of the Earth to the satellite at perigee is 2.21×104 km, what is the corresponding distance at apogee?
Wednesday, November 9, 2011 at 4:02pm

Physics
When the Earth, Moon, and Sun form a right triangle, with the Moon located at the right angle, the Moon is in its third-quarter phase. Find the magnitude of the net force exerted on the Sun. Find the direction of the net force exerted on the Sun. Give the direction relative to...
Wednesday, November 9, 2011 at 3:54pm

Blue Planet
Wind and the surface ocean currents it drives are both strongly influenced by the Fill in the Blank 01, which makes them curve from a straight path as they move over the Earth’s surface. They constantly veer to their Fill in the Blank 02 in the northern hemisphere, and to...
Wednesday, November 9, 2011 at 1:40am

Math
Atmospheric pressure changes as you rise above earth's surface. At an altitude of h kilometers, where 0<h<80, the pressure P is newtons per square centimeter is approximately modeled by the function P(h)=10.31e^(-0.116h). What is the approximate pressure at 50 ...
Tuesday, November 8, 2011 at 11:03pm

PHYSIC
1)What must be the orbital speed of a satellite in a circular orbit 740 above the surface of the earth? 2)What is the period of revolution of a satellite with mass that orbits the earth in a circular path of radius 8000 (about 1630 above the surface of the earth)?
Tuesday, November 8, 2011 at 7:12pm

chemistry
A mole of 1 gallon cans of paint could cover every square inch of the surface of how many planets the size of the earth?
Monday, November 7, 2011 at 7:46pm

Phsics
A man weighs 772 N on Earth. What would he weigh on Jupiter, where the free-fall acceleration is 25.9 m/s2? The acceleration of gravity is 9.8 m/s2 . Answer in units of N
Monday, November 7, 2011 at 1:45pm

Physics
The atmosphere of Mars exerts a pressure of only 600 Pa on the surface and has a density of only 0.02 kg/m3. (a) What is the thickness of the Martian atmosphere, assuming the boundary between atmosphere and outer space to be the point where atmospheric pressure drops to 0.01% ...
Monday, November 7, 2011 at 3:39am

earth
sam weighs 720N on the earth and 120N on the moon.what does this tell you about the value of gravity on the moon?
Sunday, November 6, 2011 at 4:36pm

Chemistry
CFCs such as CF2Cl2 are refrigerants whose use has been phased out because their destructive effect on Earth's ozone layer. The standard enthalpy of evaporation of CF2Cl2 is 17.4 kJ/mol, compared with change in H(vapor)=41kJ/mol for liquid water. How many grams of liquid ...
Sunday, November 6, 2011 at 1:29pm

Physics
An horizontally flying airplane has a 20 m wing span. If the vertical component of the Earth's magnetic field is 2*10^-5 T, and the voltage measured from wing tip to wing tip is 4 mV, What is the ground speed of the plane?
Sunday, November 6, 2011 at 1:28pm

urgent physics
A power line carries a current of 110 A at a location where the Earth's magnetic field has a magnitude of 0.37 Gauss (0.37·10-4 T) and points due north, very nearly parallel to the ground. Find the direction and magnitude of the magnetic force exerted on a 270 m ...
Friday, November 4, 2011 at 3:40pm

physics
A plane flying horizontally above Earth’s surface at 184 meters per second drops a crate. The crate strikes the ground 30.0 seconds later. What is the magnitude of the horizontal component of the crate’s velocity just before it strikes the ground? [Neglect friction...
Friday, November 4, 2011 at 3:06pm

Physics
The wavelength of light emitted from a distant galaxy by a hydrogen atom is observed to be 400 nm. If it is known that the laboratory wavelength of this light emitted by hydrogen is 380 nm, what is the velocity of the galaxy? (a) .135c away from Earth (b) .135c toward Earth (c...
Friday, November 4, 2011 at 12:55pm

Physics
An horizontally flying airplane has a 20 m wing span. If the vertical component of the Earth's magnetic field is 2*10^-5 T, and the voltage measured from wing tip to wing tip is 4 mV, What is the ground speed of the plane? (A) 5 m/s (B) 20 m/s (C) 7 m/s (D) 10 m/s
Friday, November 4, 2011 at 12:49pm

earth
If a person has a weight of 145 lb at sea level, by how much is their weight reduced when flying on an airplane at an altitude of 10700 m?
Friday, November 4, 2011 at 10:22am

Physics
A communications satellite with a mass of 400 is in a circular orbit about the Earth. The radius of the orbit is 3.7×104 as measured from the center of the Earth. Calculate the gravitational force exerted on the satellite by the Earth when it is in orbit.
Thursday, November 3, 2011 at 2:42pm

physic
Block _____ Name ________________________________________​ Date __________ Average Speed 1. In the 2008 Summer Olympics, Usain Bolt won the 100-m race in 9.69 s. What was his average speed? 2. Light from the sun reaches Earth in 8.3 min. The speed of light is 3.0108 m/s...
Thursday, November 3, 2011 at 9:53am

physic
Average Speed 1. In the 2008 Summer Olympics, Usain Bolt won the 100-m race in 9.69 s. What was his average speed? 2. Light from the sun reaches Earth in 8.3 min. The speed of light is 3.0108 m/s. How far is Earth from the sun? 3. In Major League Baseball, the distance between...
Thursday, November 3, 2011 at 9:53am

sci
1. A penny is dropped from the 82nd Floor Observatory of the Empire State Building. The penny will fall from a height of 320 meter (1,050 feet). (a) How long will it take to fall? (b) How fast is it going when it hits the ground? 2. Aim the Mythbuster’s penny gun straight...
Thursday, November 3, 2011 at 9:30am

sci
1. A penny is dropped from the 82nd Floor Observatory of the Empire State Building. The penny will fall from a height of 320 meter (1,050 feet). (a) How long will it take to fall? (b) How fast is it going when it hits the ground? 2. Aim the Mythbuster’s penny gun straight...
Thursday, November 3, 2011 at 9:30am

Science
Why is water only compound occuring naturally on earth in three states?
Wednesday, November 2, 2011 at 8:38pm

Astronomy
Explain how you could determine, given the following 3 pieces of information, (you need all 3 together not each one individually) the radius of the Earth. 1) Jakarta and Port Moresby, the capital of Paua New Guinea, are two cities on the equator. 2) A plane leaves from Port ...
Wednesday, November 2, 2011 at 7:17pm

physics180
A satellite is in circular orbit at a height R above earth's surface. a)find orbital period. b)what height is required for a circular orbit with a period double that found in part (a)?
Wednesday, November 2, 2011 at 1:14pm

physics
You are an astronaut (m = 80 kg) and travel to a planet that is the same mass and size as Earth, but it has a rotational period of only 11 h. What is your apparent weight at the equator of this planet?
Tuesday, November 1, 2011 at 8:29pm

physics
During an eclipse, the Sun, Earth, and Moon are arranged in a line as shown in the figure below. There are two types of eclipse: (a) a lunar eclipse, when Earth is between the Sun and the Moon, and (b) a solar eclipse, when the Moon is between the Sun and Earth. Calculate the ...
Tuesday, November 1, 2011 at 8:24pm

Physics
The average distance separating earth and moon is 384000 km. What is the net gravitational force exerted by earth and moon on a 3.00 * 10^4 kg spaceship located halfway between them.
Tuesday, November 1, 2011 at 8:12pm

Ms.Sue August or Anonymous
All 3 of you I see usually answer a lot of questions. Can you help me with some of these? 1. Erosion is a slow process that causes change to Earth's surface. All of the following are sources of erosion except A.wind B.earthquakes C.glaciers D.ocean waves In which of these ...
Tuesday, November 1, 2011 at 7:41pm

Physics Energy and Work Done
A 390-N child is in a swing that is attached to a pair of ropes 1.9 m long. Find the gravitational potential energy (in JOULES) of the child–Earth system relative to the child's lowest position at the following times. A) when the ropes are horizontal B) when the ropes...
Tuesday, November 1, 2011 at 12:03pm

physics
An artificial satellite circling the Earth completes each orbit in 139 minutes. (The radius of the Earth is 6.38 106 m. The mass of the Earth is 5.98 1024 kg.) (a) Find the altitude of the satellite.
Monday, October 31, 2011 at 11:10pm

Physics
A comet is traveling towards the earth. The comet has a mass of 5.50E+12 kg and a radius of 323 m. The comet is traveling with a speed of 13.5 km/s and spinning with a period of 0.15 seconds when its center is a distance 2.28E+7 m away from the center of the earth. The comet ...
Monday, October 31, 2011 at 3:26am

geography
Can you please suggest a site where I can go to help me answer this question? My book is not helping! What imaginary lines divide the Earth into the Eastern and Western Hemispheres?
Sunday, October 30, 2011 at 9:46pm

physics
Newton was holding an apple of mass 120 g and thinking about the gravitational forces exerted on the apple by himself and by the Sun. Calculate the magnitude of the gravitational force acting on the apple due to Newton, the Sun, and the Earth, assuming that the distance from ...
Sunday, October 30, 2011 at 9:09pm

physics
In the Earth–Moon system, there is a point where the gravitational forces balance. This point is known as the L1 point where the L stands for Lagrange, a famous French mathematician. Assume that the mass of the Moon is 1/81 that of the Earth. (a) At what point, on a line ...
Sunday, October 30, 2011 at 9:06pm

PHYSICS
1. The problem statement, all variables and given/known data A ride in an amusement park consists of a cylindrical chamber that rotates around a vertical axis as shown in the diagram below. When the angular velocity is sufficiently high, a person leaning against the wall can ...
Sunday, October 30, 2011 at 8:15pm

science
(a) at what times of year are the periods of daylight and darkness the same everywhere on the earth? What are these times called? (b) Where is the noon sun directly overhead at these times?
Saturday, October 29, 2011 at 11:08pm

Physics
A 1200-kg roller coaster car is initially at the top of a rise, at point circle a. It then moves 145 ft, at an angle of 40.0° below the horizontal, to a lower point circle b. (a) Choose the car at point circle b to be the zero configuration for gravitational potential ...
Saturday, October 29, 2011 at 8:31pm

English
1) Writeacher, I need the help of a science teacher to find a theme high-school students (aged 16 and 17) can investigate with their German and French partners. Our students study biology (also bilotechnologies) , chemistry, and earth science. 2) Can you check these two ...
Saturday, October 29, 2011 at 9:01am

physical
What is the reaction force to an action force of 750 N exerted by Earth on an orbiting communications satellite?
Thursday, October 27, 2011 at 10:04pm

trig
L ii i i i i i i i i A i i i i i i i i i i 4000 miles i i i i E ii right triangle have to find side EL. The range of a lighthouse is the maximum distance at which its light is visible. In the figure, point A is the farthest point from which it is possible to see the light at ...
Thursday, October 27, 2011 at 6:25pm

trig
Since its construction in 1821, Marblehead Lighthouse has stood at the entrance to Sandusky Bay, guiding sailors along Lake Erie’s rocky shores. The 65-foot tower is one of Ohio’s best-known landmarks and the oldest continuously operating lighthouse on the Great ...
Thursday, October 27, 2011 at 6:08pm

Science plz help
Igneous rock is produced by volcanoes. What do you know about the activity on Earth during the time the oldest layer of rock was produced?
Thursday, October 27, 2011 at 6:06pm

SCIENCE
Igneous rock is produced by volcanoes. What do you know about the activity on Earth during the time the oldest layer of rock was produced?
Thursday, October 27, 2011 at 5:34pm

SCIENCE
Igneous rock is produced by volcanoes. What do you know about the activity on Earth during the time the oldest layer of rock was produced?
Thursday, October 27, 2011 at 4:54pm

Physical Science
Galaxy A is 600 million light years from earth. Galaxy B is moving away from the earth at a speed that is 80% as large as that of Galaxy A. How far from earth is Galaxy B? A. 750 million light years. B. 640 million light years. C. 540 million light years. D. 480 million light ...
Thursday, October 27, 2011 at 1:07pm

PSY Quiz
Who can help me to double check my Quiz ....please? Question 1 of 10 According to Freud, the psychosexual stage that occurs during the first year of life is called the ___________ stage. A. Latency B. Anal ->C. Oral D. Phallic Reset Selection Question 2 of 10 Davey is a ...
Thursday, October 27, 2011 at 12:06pm

chemistry
how long would it take a radio wave with a frequency of 7.25 x 10to the 5th to travel from Mars to earth if the distance is approx. 8.0 x 10 to the 7th?
Wednesday, October 26, 2011 at 10:34pm

Science
Is the answer D? Thank you The earliest atmosphere of Earth is not believed to have contained oxygen. Which cellular component would not have been useful at that time? A) chloroplast B) nucleus C) plasma membrane D) mitochondrion
Wednesday, October 26, 2011 at 7:29pm

Natural science
What might happen to earth if the temperature in the atmosphere rises by 5degrees and if the water in the ocean gets colder?
Wednesday, October 26, 2011 at 11:32am

science
if the radius of a metal hoop that surrounds a silo were to expand by 1.00 m, the circumference of the hoop would increase by 6.28 m. If a metal hoop that completely surrounds the earth were to thermally expand so that its radius increased by 1.00m , by how much would its ...
Wednesday, October 26, 2011 at 4:29am

physics
A person can jump a maximum horizontal distance (by using a 45 projectile angle) of 5 m on Earth. What would be the maximum range on Mars, where the acceleration due to gravity is 0.38 g?
Tuesday, October 25, 2011 at 7:43pm

science
Imagine that you were on the moon (which has an acceleration rate 1/6 that of earth's 9.8 m/s) What would it's gravitiational acceleration rate be?
Monday, October 24, 2011 at 9:20pm

Science
If someone could check my answer: Dynamic lows are accentuated due to the fact that they rotate in the same direction as the Earth's surface (Cyclonic flow). This is called-----CORIOLIS EFFECT....Thanks
Monday, October 24, 2011 at 7:31pm

Physics
Suppose that the magnetic field o fthe Earth were due to a single current moving in a circle of radius 2988 km through the earth’s molten core. The strength of the Earth’s magnetic field on the surface near a magnetic pole is about 6.00E-5 T. About how large a ...
Sunday, October 23, 2011 at 11:56pm

Geology
For my final I am to write a paper discussing the following : Select some product produced in your city or state that is made from earth, mineral, or energy resources. One example would be the tar paper used as a building material. (Do not use this example). Prepare a 700- to ...
Sunday, October 23, 2011 at 9:55pm

Physics
The Earth's rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2006 the Earth took about .840 s longer to complete 365 revolutions than it did in the year 1906. What was the average acceleration of the Earth during this time? ...
Sunday, October 23, 2011 at 8:23pm

physics
Compute the orbital radius of an earth satellite that has an equatorial orbit and always remains above a fixed point P on the earth's surface. Communication satellites have such "geosynchronous" orbits (see figure). These satellites are used to relay radio and ...
Sunday, October 23, 2011 at 7:23pm

Physics
Hi,I need help with question 1) There were twins on our planet earth. They were physicst. One of them were sent to space at his 20 year. When he comes back after 20 years of stay in the space he was 40 years but his brother who stayed on earth was 60 years old. How can it be? ...
Sunday, October 23, 2011 at 1:36am

Physics
Physics Help... Applying Newtons Laws Grade 11? On the surface of the earth a geological hammer has a mass of 1500g. Determine its mass and weight on Mars where g=3.6 m/s^2.
Saturday, October 22, 2011 at 12:11pm

Science
Which of the following describes the slowest change on earth's surface? A) Gravity pulls an area of wet soil and rock downward in a landslide B) An earthquake releases energy that built up below Earth's surface C) Lava explodes from a volcano on an island D) A canyon ...
Saturday, October 22, 2011 at 10:40am

physics
The tropospheric lapse rate (the rate at which temperature decreases with altitude) is approximately 6°C per kilometer. Given that the mean surface temperature of Earth is 288 K and the effective radiating temperature is 255K, from what altitude does most of the emitted ...
Saturday, October 22, 2011 at 1:10am

physics
Solar luminosity is estimated to have been 30% lower than today at the time when the solar system formed, 4.6 billion years ago. (a) If Earth's albedo was the same as it is now (A=0.3), what would have been its effective radiating temperature Te at that time? (b) If the ...
Saturday, October 22, 2011 at 1:03am

Math
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...
Friday, October 21, 2011 at 8:46pm

Math
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, ...
Friday, October 21, 2011 at 8:40pm

Physics
A planet with mass 7 x 1024 kg orbits a sun with a period of 1 Earth's years. The speed of the planet around that sun is constant and |v|=43000 m/s. What is the mass of that sun?
Friday, October 21, 2011 at 4:59pm

biology
What are the major reservoirs of organic carbon on earth?
Friday, October 21, 2011 at 1:41am

physics
At a track-and-field meet, the best long jump is measured as 8.00 m. The jumper took off at an angle of 46° to the horizontal. (a) What was the jumper’s initial speed? (Neglect air resistance.) 1 m/s (b) If there were another meet on the Moon and the same jumper could...
Thursday, October 20, 2011 at 8:53pm

English
I urgently need your help to translate this school profile into English. Thank you. I included another sentence, too. 1) Students aged between sixteen and eighteen can opt for the bilingual branch (??) and study subject like Geographie/Earth Science, biology and history in ...
Thursday, October 20, 2011 at 4:54pm

earth
a satellite orbits the earth in circular orbit 620 km above the suface. if the radius of the earth is 6380 km, calculate, to 3 significanf figures, the distance travelled in a single orbit?
Thursday, October 20, 2011 at 1:20pm

physics numerical
a satellite orbitting the earth at the equator at a na ltitude of 400 km, has an antenna that can be modelled as a 2.0m long rod. the antenna is oriented perpndicular to the earth's surface. at the equator, the earth's magnetic field is essentially horizontal and has a...
Thursday, October 20, 2011 at 4:47am

physics
Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 74 kg student to accelerate downward at 9.8 m/s2, determine the upward acceleration of the Earth during the student’s fall. Answer in units of m/s2
Thursday, October 20, 2011 at 12:47am

science
Gravity on the surface of the moon is only 1/6 as strong as gravity on the Earth. What is the weight of a 15 kg object on the Earth? The acceleration of gravity is 10 m/s 2
Wednesday, October 19, 2011 at 9:45pm

Science
In what way is erosion NOT like weathering? A)It is a force that changes the earth's surface B)It is a destructive force C)It changes rocks in some way D)It breaks down rocks I think D??
Tuesday, October 18, 2011 at 6:19pm

Earth Science
Near shore, larger sand and gravel particles are moved along the ocean bottom by ____. a. deposition b. turbulence c. spits d. density currents
Tuesday, October 18, 2011 at 5:30pm

Math
You have 200 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side along the river, find the length and width of the plot that will maximize the area _____________________________________ Among all pairs of numbers whose sum is 20...
Tuesday, October 18, 2011 at 2:49pm

physics
light travels at a constant speed of 3x10^11 cm /sec how long does it take light to reach the earth a distance of 1.5x10^8 km give your answer in seconds and minutes.
Monday, October 17, 2011 at 9:39am

PHYSÝCS
Find the speed of a satellite in a circular orbit around the Earth with a radius 3.65 times the mean radius of the Earth; RE= 6.37·103 km ME= 5.98·1024 kg
Monday, October 17, 2011 at 9:33am

physics
A canoe has a velocity of 0.39 southeast relative to the earth. The canoe is on a river that is flowing 0.59 east relative to the earth. Find the magnitude of the velocity of the canoe relative to the river. Find the direction of the velocity of the canoe relative to the river
Monday, October 17, 2011 at 7:10am

Physics
A ferry is crossing a river. The ferry is headed due north with a speed of 2.8 m/s relative to the water and the river’s velocity is 4.9 m/s to the east. a) What is magnitude of the boat’s velocity relative to Earth
Monday, October 17, 2011 at 12:57am

Physics
A ferry is crossing a river. The ferry is headed due north with a speed of 2.8 m/s relative to the water and the river’s velocity is 4.9 m/s to the east. a) What is magnitude of the boat’s velocity relative to Earth
Monday, October 17, 2011 at 12:57am

AP environmental Science
What formula would i use to solve: If the earth has an annual growth rate of 1.2% how many people are added to the earth each year? what will be the population of earth in 2050? thanks, any help is appreciated!! :D
Sunday, October 16, 2011 at 10:17pm

astronomy
6. Suppose that you travel to a planet that has 4 times the Earth’s mass and 4 times the Earth’s radius. Calculate how much more or less you would weigh on this planet compared to your weight on Earth. Express your answer as a factor or fraction of your weight on ...
Sunday, October 16, 2011 at 10:03pm

geography
The question is - Into how many time zones is the Earth divided? My Answer is Twenty-Four time zones. Right? What is the approximate degrees of longitude for the International Date Line? My answer is 180 degrees longitude. Is this right? Thanks for all the help you have ever ...
Sunday, October 16, 2011 at 9:36pm

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