Sunday
April 20, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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physics
Two stars are 4.40 1011 m apart and are equally distant from the earth. A telescope has an objective lens with a diameter of 1.03 m and just detects these stars as separate objects. Assume that light of wavelength 550 nm is being observed. Also assume that diffraction effects...
Friday, April 18, 2014 at 3:19pm

Physics
The acceleration due to gravity on Earth is 9.80 m/s2. If the mass of a dog is 40.0 kg, what is the weight of the dog?
Friday, April 18, 2014 at 9:49am

physics
The moon's diameter is 3.48 106 m, and its mean distance from the earth is 3.85 108 m. The moon is being photographed by a camera whose lens has a focal length of 48.5 mm. (a) Find the diameter of the moon's image on the slide film. (b) When the slide is projected onto...
Thursday, April 17, 2014 at 10:10pm

Physics 1
What is the rotational kinetic energy of the Earth in its orbit around the sun?
Thursday, April 17, 2014 at 6:09pm

Physics 1
Is the Earth Rotating? net torque means it is accelerating...
Thursday, April 17, 2014 at 5:39pm

Astrology
It is useful in discussing objects in the sky to imagine them to be attached to a sphere surrounding the earth.
Thursday, April 17, 2014 at 3:39pm

Maths
A 40m deep well with radius 3m is dug and the earth taken out is evenly spread to form a platform of dimensions 28m by 22m.find the heiht of the platform.
Thursday, April 17, 2014 at 10:21am

geometry
The radius of the earth is approximately 6371 km.If the international space station (ISS) is orbiting 353 km above the earth, find the distance from the ISS to the horizon(x)
Wednesday, April 16, 2014 at 12:57pm

Physics
Gravity on Mars is 1/3 of that on earth. If Mars atmosphere is only 2 km thick, what is atmospheric pressure on Mars?
Wednesday, April 16, 2014 at 4:32am

english/vocabulary
For example, Mars and Earth is a small and big planets thats why they are like the best of both worlds.
Tuesday, April 15, 2014 at 8:29pm

science
why does an person in space craft orbiting earth experiance a feeling of weightless?
Tuesday, April 15, 2014 at 6:07pm

science
Find the angular and linear velocities of a man due to the rotation of the earth if he standing A) at the equator B) in Muscat(latitude23.5) C) in oslo(latitude60) Take tha radius of the earth as 6380km
Tuesday, April 15, 2014 at 4:43pm

Science -Check Answers- Please
1.) How did planetesmals form planets? A. They broke apart into smaller chunks. B. They collided and stuck together. ******** C. They cooled and pulled ice together. D. They began to rotate. 3. Which of the following statements about features on the sun is true? A. Prominences...
Monday, April 14, 2014 at 9:00pm

HELP!
btw I took honors biology in 8th grade and this year I'm taking honors earth science. Usually you take honors chem at a sophomore if your an honors student but teachers can recommend you to AP.
Monday, April 14, 2014 at 8:10pm

Physics
Gravity on Mars is 1/3 of that on earth. If Mars atmosphere is only 2 km thick, what is atmospheric pressure on Mars?
Monday, April 14, 2014 at 3:21am

earth
322
Sunday, April 13, 2014 at 9:01pm

Astrophysics
The Earth formed at a redshift of z∼0.53. That means that when our world was young, the universe was quite a bit smaller than it is today. The nearest galaxies to our own are around 10 kpc (kilo-parsecs) in size, lie at a distance of around 1 Mpc from us (Mega-parsecs), ...
Saturday, April 12, 2014 at 1:30am

Pyhsics
The weight of the atmosphere above 1 m2{\rm m}^{2} of Earth's surface is about 100,000 N{\rm N}. Density, of course, becomes less with altitude. But suppose the density of air were a constant 1.2 kg/m3{\rm kg}/{\rm m}^{3}. Calculate where the top of the atmosphere would be...
Thursday, April 10, 2014 at 1:53pm

Math
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 42 years
Thursday, April 10, 2014 at 2:19am

BILOGY
more sun (intensity and day length)=more photosynethesis earth tilted so trees point more directly to sun (ie seasons)=more sun
Wednesday, April 9, 2014 at 9:15pm

Memorable Letter Evaluation (Writeacher)
Write a letter to your parents about a memorable moment in your life, using imagery to capture your experience. I origionally sumbitted a different letter, but Bob insisted that I should write more about my feelings toward my experience than using imagery. "Dear Mom and ...
Wednesday, April 9, 2014 at 8:02pm

math PLEASE HELP!!!!!
girth = 2(32+49) = 162 times length 41 = 6642 ft^2 base area = 32*41 = 1312 times height = 64288 ft^3 Why on earth do you need a formula? Draw a picture.
Wednesday, April 9, 2014 at 1:10pm

SCIENCE PLEASE HELP ASAP
If you are a student at a Connections Academy school, posting this question from the 6th grade, "Earth's Interior Systems" Unit Test is considered plagiarism.
Wednesday, April 9, 2014 at 12:29pm

physics
A baseball pitcher throws a baseball horizontally at a linear speed of 41.3 m/s. Before being caught, the baseball travels a horizontal distance of 15.4 m and rotates through an angle of 52.7 rad. The baseball has a radius of 3.74 cm and is rotating about an axis as it travels...
Wednesday, April 9, 2014 at 12:28am

Language Arts ~CHECK MY ANSWERS~
Here is the poem for # 2: Another Mountain Sometimes there’s a mountain that I must climb even after I’ve climbed one already But my legs are tired now and my arms need a rest my mind is too wary right now But I must climb before the storm comes before the earth ...
Tuesday, April 8, 2014 at 3:34pm

college alg
The height of a projectile fired upward is given by the formula s = v0t − 16t2, where s is the height, v0 is the initial velocity, and t is the time. Find the time for a projectile to return to Earth if it has an initial velocity of 184 ft/s.
Tuesday, April 8, 2014 at 12:35pm

college alg.
The height of a projectile fired upward is given by the formula s = v0t − 16t2, where s is the height, v0 is the initial velocity, and t is the time. Find the time for a projectile to return to Earth if it has an initial velocity of 184 ft/s. ____________ s
Tuesday, April 8, 2014 at 11:32am

Single Room, Earth View by Sally Ride--Help!
1. Choose a quotation. 2. Find Sally Ride's observations that relate to your quote. 3. Make an outline of your essay.
Monday, April 7, 2014 at 10:24pm

Single Room, Earth View by Sally Ride--Help!
This regards the story "Single Room, Earth View" by Sally Ride. Choose one of the following quotations; then in a few paragraphs, discuss how Sally Ride's observations support or refute the quotation. Quotations: 1. "Observation is a passive science, ...
Monday, April 7, 2014 at 10:07pm

Language Arts
OK, how about this. There is always a way around exterminating a race of animals, even if it means we do nothing. Human being can easily survive without any further expansion, we have set up our lives like that, any further species wiped out by us will be done out of greed and...
Monday, April 7, 2014 at 7:40pm

History
http://www.smithsonianmag.com/science-na​ture/how-did-water-come-to-earth-7203724​8/?no-ist
Monday, April 7, 2014 at 6:50pm

History
Our water is actually meteoroids that hit Earth a long time ago.
Monday, April 7, 2014 at 6:43pm

History
How did we get water on earth?
Monday, April 7, 2014 at 6:39pm

physics
Earthquakes are essentially sound waves—called seismic waves—traveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called P waves, is 7800m/s . Transverse waves, called...
Monday, April 7, 2014 at 4:36pm

Physic II
A 992.0-g iron meteor impacts the earth at a speed of 1447.0 m/s. If its energy is entirely converted to heat of the meteorite, what will the resultant temperature rise be? (The specific heat for iron is 113 cal/kg.C)
Monday, April 7, 2014 at 2:00pm

Science - Check my answers please (6th grade)
When are tides in Earths oceans the highest? 1. during the moon's waning gibbous phase 2. during the moon's waxing gibbous phase 3. when the moon is at a right angle to the sun 4. When the sun, Earth, and moon are in a line.
Monday, April 7, 2014 at 12:50pm

Science - Check my answers please (6th grade)
earth and the moon are kept in their respective orbits due to the influence of ? a) inertia b) gravity c) both inertia and gravity d) neither inertia and gravity Is it c) both inertia and gravity?
Monday, April 7, 2014 at 11:41am

physics plz help
I need help in calculating work. following quantites are given. * G: 6.67E-11 *Mass of earth:5.98E24 *mass of satelightt:80kg *x(initial) center of the earth-7E6 m *x(final) center of the earth 12E6 m How do I make integral equation I need use 20 interval or calculate in excel...
Monday, April 7, 2014 at 5:36am

physics/calculus
I need help in calculating work. following quantites are given. * G: 6.67E-11 *Mass of earth:5.98E24 *mass of satelightt:80kg *x(initial) center of the earth-7E6 m *x(final) center of the earth 12E6 m How do I make integral equation I need use 20 interval.
Monday, April 7, 2014 at 1:04am

Physics
On earth I assume weight on first line = (86.4+20.8)(9.81) weight on second (lower) line = 20.8 (9.81)
Sunday, April 6, 2014 at 8:53pm

physics
in the horizontal direction the ball has no acceleration once let go (no horizontal force) so now it is 9 m/s^2 down by the way, g on Mars about the same as earth ? FALSE
Sunday, April 6, 2014 at 8:50pm

6th Grade Science - Help
Which of Earth's spheres has the most mass? 1. atmosphere 2. hydrosphere 3. geosphere 4. biosphere Is it Biosphere?
Saturday, April 5, 2014 at 10:12am

Math, Geomertry
given the distance between centers, the distance from the center of the moon to the surface of the earth is 248740 miles. The distance from the center of the sun to the center of the moon is thus 93000000-248740 = 92751260 miles. At that distance, the moon casts a shadow (...
Friday, April 4, 2014 at 5:18pm

Math, Geomertry
A total solar eclipse occurs when the moon passes between the earth and the sun, and the darkest shadow cast by the moon, called the umbra, hits the surface of the earth. If the umbra does not hit the surface, as shown in the following figure, then a total solar eclipse is not...
Friday, April 4, 2014 at 4:58pm

Social Studies
Read the speech below. It is a fictitious political speech by Peter, a candidate for the upcoming national election. Then answer the following questions: List all of the arguments in the speech List all of the non-arguments in the speech List all of the factual contents in the...
Friday, April 4, 2014 at 10:18am

physical science
Ozone absorbs most of the UV light from the sun; thus, ozone effectively blocks the UV-B rays from striking the earth.
Thursday, April 3, 2014 at 4:25pm

Science - Check my answers
1. Which of the following statements best defines tides? 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 ...
Thursday, April 3, 2014 at 1:21pm

earth
vescape=sqrt(2g*m/r)
Thursday, April 3, 2014 at 12:51pm

environmental science
helped to create and retain Earth's atmosphere
Thursday, April 3, 2014 at 10:48am

physics
The Earth has a radius of about 6.38 ´ 103 kilometers at the equator and rotates 360° every 24 hours. The angular displacement of a person standing at the equator for 8.0 hours is:
Wednesday, April 2, 2014 at 7:54pm

Physics
A satellite is given a boost of 540 MJ of energy to move it from its initial orbit at an altitude of 150 km to a higher altitude orbit. If the satellite has a mass of 1.16 ✕ 10^3 kg, what is the new altitude it reaches? Take the mass of the Earth to be 5.97 x 10^24 kg ...
Wednesday, April 2, 2014 at 3:59pm

Physics-Gravitational Potential Energy
A satellite is given a boost of 540 MJ of energy to move it from its initial orbit at an altitude of 150 km to a higher altitude orbit. If the satellite has a mass of 1.16 ✕ 103 kg, what is the new altitude it reaches? Take the mass of the Earth to be 5.97 x 10^24 kg ...
Tuesday, April 1, 2014 at 10:06pm

Math
4. Columbus had a hard time convincing anyone to undertake the expense of financing a voyage to an unknown place. Based on the information available from other sailors and partly on his own ideas, Columbus underestimated the circumference of the Earth by twenty-one percent. ...
Tuesday, April 1, 2014 at 11:33am

Physics please help ASAP!
If you know the mass of a star and a planet’s radius and speed at perihelion (closest approach to the star), then using conservation of energy and angular momentum you can solve for the radius and speed of that planet at aphelion (farthest point from the star). Encke’...
Monday, March 31, 2014 at 11:20pm

college physics 2
A healthy astronaut's heart rate is 60 beats/min. Flight doctors on Earth can monitor an astronaut's vital signs remotely while in flight. How fast would an astronaut be flying away from Earth if the doctor measured her having a heart rate of 28 beats/min?
Monday, March 31, 2014 at 9:48pm

physics
The acceleration due to gravity on the moon is 1.62 m/s2. What is the length of a pendulum whose period on the moon matches the period of a 4.00-m-long pendulum on earth?
Monday, March 31, 2014 at 7:47pm

science(check answers)
1.---please help 2.C 3.D 4.C 5.A 6.C 7.---please help 1.An advantage of using an electromagnet,shown on the crane in the image below,instead of a regular magnet to move cars in a junkyard is that an electromagnet can easily be turnd on and off. A.true B.false 2.Imagine two ...
Monday, March 31, 2014 at 5:01pm

Math
4. Columbus had a hard time convincing anyone to undertake the expense of financing a voyage to an unknown place. Based on the information available from other sailors and partly on his own ideas, Columbus underestimated the circumference of the Earth by twenty-one percent. ...
Monday, March 31, 2014 at 4:36pm

EARTH SCIENCE
capacity
Monday, March 31, 2014 at 4:36pm

Social Studies
Use the biblical quotations below to answer the following question: 5 He set the earth on its foundations; it can never be moved.—Psalm 104:5 5 The sun rises and the sun sets, and hurries back to where it rises.—Ecclesiastes 1:5 Based on the Biblical quotations above...
Thursday, March 27, 2014 at 1:41pm

Global Studies
Although the Amazon Basin receives more than 80 inches of rain per year, South America also has the driest place on Earth, know as a. Death valley b. Gobi desert c. Atacama desert*** d. the Caribbean
Thursday, March 27, 2014 at 11:56am

physic
A stationary 2.0 kg object is located on a table near the surface of the earth. The coefficient static friction between the surface is .80 and the coefficient of the kinetic friction is 0.65. A horizontal force of 5N is applied to the object. Determine the force of friction. ...
Thursday, March 27, 2014 at 11:33am

physic
A stationary 2.0 kg object is located on a table near the surface of the earth. The coefficient static friction between the surface is .80 and the coefficient of the kinetic friction is 0.65. A horizontal force of 5N is applied to the object. Determine the force of friction. ...
Thursday, March 27, 2014 at 11:12am

Science
Without newtons second law would there be gravity on earth??????? Help!!! And also how are newtons second and third laws of motion important to your everyday life?
Wednesday, March 26, 2014 at 8:21pm

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
Wednesday, March 26, 2014 at 7:21pm

global warming science
1a (5 points possible) A schematic of a two layer model of the Earth-atmosphere energy balance is shown in the image below. The atmosphere is assumed to be transparent to solar radiation, and the total solar radiation absorbed by the surface is written in terms of the ...
Wednesday, March 26, 2014 at 6:16pm

Science
The force of gravity on Jupiter is much stronger than the force of gravity on Earth. Which of the following explains why this is true?
Tuesday, March 25, 2014 at 5:24pm

EARTH SCIENCE
idk
Tuesday, March 25, 2014 at 2:35pm

Physics
In Stranger in a Strange Land, Robert Heinlein claims that travelers to Mars spent 258 days on the journey out, the same for return, \plus 455 days waiting at Mars while the planets crawled back into positions for the return orbit." Show that travelers would have to wait ...
Tuesday, March 25, 2014 at 9:05am

Water cycle question
The planet is covered by 97% ocean water. What would the global water cycle look like if the earth were covered by 50% ocean water?
Monday, March 24, 2014 at 8:37pm

Physics( Explain and choose right answer)
A ball on the end of a rope is moving in a vertical circle near the surface of the earth. Point A F T is at the top of the circle; C is at the bottom. Points B and D are exactly halfway between A and C. Which one of the following statements concerning the tension in the rope ...
Monday, March 24, 2014 at 6:40pm

physics
Assuming the Earth's magnetic field averages about 0.50×10−4 T near Earth's surface, estimate the total energy stored in this field in the first 15km above Earth's surface. The radius of Earth is 6380 km.
Sunday, March 23, 2014 at 8:15pm

physics
Earth is approximately a sphere of radius 6.37 × 106 m. What are (a) its circumference, (b) its surface area, and (c) its volume? please help
Sunday, March 23, 2014 at 7:57am

science
. An advantage of using an electromagnet, shown on the crane in the image below, instead of a regular magnet to move cars in a junkyard is that an electromagnet can easily be turned on and off. A toy crane with an electromagnet lifting a toy car from a pile of cars (1 point) ...
Saturday, March 22, 2014 at 5:47pm

science
an object being pulled to earth by gravity will have the force of air pushing back opposite directions
Saturday, March 22, 2014 at 5:06pm

Science
If the density of a steel hammer 7gm/cm on earth what would the density be on a spaceship?
Thursday, March 20, 2014 at 5:27pm

Physics
In a lightning bolt, a large amount of charge flows during a time of 2.2 10-3 s. Assume that the bolt can be treated as a long, straight line of current. At a perpendicular distance of 28 m from the bolt, a magnetic field of 7.3 10-5 T is measured. How much charge has flowed ...
Thursday, March 20, 2014 at 1:56pm

Science
How many minutes are required for a radio signal to travel for Earth to a space station in Mars if the planet Mars is 7.83 x 10 to the 7th km from Earth?
Thursday, March 20, 2014 at 12:45am

Earth Science
DONT GO FOR SPITS its defiantly not the answer.
Wednesday, March 19, 2014 at 9:10pm

Physics!
Consider someone in a rotating space habitat. The outward force felt by the person A.has no reaction counterpart B.is an interaction with Earth C.is a form of gravity D.is real in the traditional sense
Wednesday, March 19, 2014 at 8:07pm

science
A meteorite weighs 300 Newtons on the moon. the moons force of gravity is 1/6 that of earth. what is the meeorites weight on earth?
Wednesday, March 19, 2014 at 4:39pm

Science
The total amount of ice in the Greenland ice sheet is estimated to be 2.85 million cubic km. Assume the Earth's surface is 70% covered by ocean, and that the Earth's radius is 6300 km. How many meters would sea level rise if the entire Greenland ice sheet were to melt...
Wednesday, March 19, 2014 at 1:57pm

Science
1. Where is the Earth's equator located today? Describe the climatic conditions. 2. Compare and contrast the climatic conditions existed during this time today. 3. Answer: What types of fossils would you expect to find here? Explain why based on the animals' ...
Tuesday, March 18, 2014 at 8:13pm

Alegbra
The distance from the Earth to the sun is 93,000,000 miles. Write this number in scientific notation.
Tuesday, March 18, 2014 at 4:50pm

6th grade Lang
14. I can accept the rain and wind since I know that these two elements are important to water the earth and then to dry it back out again. ans: complex I can accept the rain and wind = independent clause since I know that these two elements are important to water the earth = ...
Tuesday, March 18, 2014 at 8:12am

6th grade Lang
Can you recheck these? I don't understand. 10. I enjoy it because the temperature is pleasant, and everything is green and pretty. ans: cd (compound) 11. I also love to hear the birds singing in the trees and to watch them building their nests. ans: SS (simple) 13. In the ...
Tuesday, March 18, 2014 at 7:01am

Algebra URGENT! Conic sections
A spacecraft is in a circular orbit 150 kilometers above Earth. Once it attains the velocity needed to escape the Earth's gravity, the spacecraft will follow a parabolic path with the center of Earth as focus. Suppose the spacecraft reaches escape velocity above the North ...
Tuesday, March 18, 2014 at 6:55am

Environmental Concern Speech
Can someone give their opinion about the beginning of my speech? "A few short days ago, my mother and I left our house to journey to the local grocery store. While my mother veered onto the highway, I quickly glanced over at the side of the road, only for my attention to ...
Monday, March 17, 2014 at 11:26pm

6th grade - Lang Arts
Can you check the following? Find the verb phrase 1. Will you buy me a drink? ans: will buy 2. Sam is not going to the dance. ans: is going 3. Al should have mowed the lawn today. ans: should have mowed 4. Theresa will be playing her clarinet at the concert tonight. ans: will ...
Monday, March 17, 2014 at 8:55pm

Physics
If your scale reads in grams or kilograms, that is mass assuming you do this on earth without acceleration (do not do it while in free fall before opening your parachute) If your scale reads in pounds, that is really force, not mass. Convert the pounds to kilograms.
Monday, March 17, 2014 at 6:49pm

science
how do you explain the millions of different substances found on earth
Sunday, March 16, 2014 at 8:24pm

Astronomy
Light travels at a constant speed of 3.0 x 105km/s. The distance between the Sun and the Earth is about 1.5 x 108km. Use the distance = speed x time formula (d = v t) to calculate the time it takes light to travel from the Sun to the Earth. Show your work. Express your result ...
Saturday, March 15, 2014 at 8:04pm

Astronomy
Light travels at a constant speed of 3.0 x 105km/s. The distance between the Sun and the Earth is about 1.5 x 108km. Use the distance = speed x time formula (d = v t) to calculate the time it takes light to travel from the Sun to the Earth. Show your work. Express your result ...
Saturday, March 15, 2014 at 6:51pm

Science
1. Which of the following can be expected to occur as climate change continues on Earth? (1 point) decreased melting of sea ice decreased migration of pests and pathogens increased freshwater sources increased coastal flooding* 2. Which piece of children’s’ ...
Friday, March 14, 2014 at 10:35pm

physics
Calculate the force needed to accelerate a 1 kg ball by 3 m/s: a. in space along way from the earth. b. on the ground in a direction horizontal to the ground. c. on the earth vertically upward.
Friday, March 14, 2014 at 9:19pm

Earth science
Right.
Friday, March 14, 2014 at 11:45am

physics
What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth gR2(R+h)2 gR(R+h) g(R−h)R g(R−h)2R2 2 The instrument used for experimental determination of the value of the universal gravitational constant G is ...
Friday, March 14, 2014 at 7:24am

8th Grade Earth Science Help?
:-)
Friday, March 14, 2014 at 12:30am

Earth science
The greenhouse effect is a result of A. consumption of fruits and vegetables that produce a biofuel. B. absorption and radiation of energy in the hydrosphere. C. absorption and radiation of energy in the atmosphere. D. consumption and radiation of energy in the atmosphere. D?
Thursday, March 13, 2014 at 11:29pm

Earth science
1. Which of the following is not a natural cause of climatic change? A. Earth's tilt B. Solar activity C. Human activity D. Volcanic activity I think it is C
Thursday, March 13, 2014 at 11:27pm

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