Friday
July 29, 2016

Homework Help: Science: Earth

Recent Homework Questions About Earth

Science
When did the first human exist? And when did they start populating the earth?
Wednesday, July 27, 2016 by Isaiah

Physics
If you weigh 670 N on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter of 15.0 km ? Take the mass of the sun to be ms = 1.99×1030 kg , the gravitational constant to be G = 6.67×10−11 N&#...
Friday, July 22, 2016 by Ane

Physics
A second's pendulum is taken on the surface of moon where acceleration due to gravity is 1/6th of that of earth.Will the time period of pendulum remain same or increase or decrease?Give a reason.
Wednesday, July 20, 2016 by Yashasvi

Math
The earth takes 365 1/4 days to go around the sun. Mercury takes 3 days less than 1/4 of this time. How many days does Mercury take to go around the sun? I believe I would have to find 1/4 of the 365 1/4 days then take 3 days out. I was given this do as home work but was not ...
Tuesday, July 19, 2016 by Arianna

Physics
Horizontal electric power lines supported by vertical poles can carry large currents. Assume that Earth’s magnetic field runs parallel to the surface of the ground from south to north with a magnitude of 0.50××10^-4 Tesla and that the supporting poles are 38 m...
Tuesday, July 19, 2016 by Mike

math
If earth rotates at about 1000 mph and it rotates constantly each day. How many rotations will it complete after 4th hour, 8th hour and 24th hour.
Sunday, July 17, 2016 by gieian

Physics
What would happen if the earth's radius decreased
Friday, July 15, 2016 by Spaceinstein

Science
If you weigh 300 N on earth, then what is your mass and weight in mars?
Thursday, July 14, 2016 by Charlaine

physics
the acceleration of free fall on the moon is one sixth of that on earth. what would be the period on the moon of a simple pendulum which has a period of one second on the earth?
Saturday, July 9, 2016 by SUBHAN

science
A simple pendulum with bob of mass m and conducting wire of length L swings(is hanging ) under gravity thro' an angle 2theetha. The earth's magnetic feild component in the direction perpendicular to swing is B. the max potential diff induced across pendulum is?
Thursday, July 7, 2016 by somya

Physics
An astronaut wearing a spacesuit can jump 0.5 m vertically at the surface of the earth. The gravitational acceleration on Mars is 0.4 times that on the earth. If her takeoff velocity is the same, how high can the astronaut jump on Mars?
Wednesday, July 6, 2016 by Mathusha

Biology
1. When and where was the first cell born? How did it happen? 2. What are the circumstances that make the appearance of the cell in this earth? 3. What are the differences between prokaryotic and eukaryotic cell? How about plant and animal cell?
Sunday, July 3, 2016 by mike

Physics
A planet with density equal to Earth is 2R times far away from earth, if we double the distancs from 2R to 4R then "g" becomes:-
Saturday, July 2, 2016 by Sagar

Physics
A satellite orbits the Earth with a radius of 7000km. The acceleration of gravity at this distance=8.17m/s/s. How do I find the velocity of the satellite? I'm really struggling with finding the correct formula. I know the answer but can't figure out how to get there. ...
Wednesday, June 29, 2016 by Leslie

science
How Do the Earth's Four Subsystems Work Together?
Wednesday, June 29, 2016 by LESTER

Physics
I'm really struggling trying to understand what formulas to use for the following: A satellite orbits the earth with a radius of 7000 km. (a) what is the acceleration of gravity at this distance? (b) what is the velocity of the satellite? (c) how long does it take the ...
Wednesday, June 29, 2016 by Anna

Physics
I'm really struggling trying to understand what formulas to use for the following: A satellite orbits the earth with a radius of 7000 km. (a) what is the acceleration of gravity at this distance? (b) what is the velocity of the satellite? (c) how long does it take the ...
Tuesday, June 28, 2016 by Anna

geometry
The summit of Mount Everest is approximately 29,035 ft above sea level. What is the distance from the summit to the horizon, rounded to the nearest mile? Assume that the distance from the Earth's center to any point on Earth's surface is 4,000 miles. How do I solve this?
Tuesday, June 28, 2016 by Cole

math
Help? The summit of Mount Everest is approximately 29,035 ft above sea level. What is the distance from the summit to the horizon, rounded to the nearest mile? Assume that the distance from the Earth's center to any point on Earth's surface is 4,000 miles.
Tuesday, June 28, 2016 by Cole

Bio
Which of the following best describes the influence of latitude on climate? A. Temperate regions receive more solar energy and heat per unit area than tropical regions. B. Polar regions receive less solar energy and heat per unit area than tropical regions. C. Earth's ...
Monday, June 27, 2016 by Anonymous

science
How much below the surface of the earth does the acceleration due to gravity become 1percent of its value at the earth surface? The earth is assume to be a sphere of radius 6.4×10^6m.
Saturday, June 25, 2016 by Ioba Bolwary Marak

Physics
A satellite orbits at a distance from the Earth's center of abut 3.00 earth radii and takes 7.30 hours to go around once. What distance (in meters) does the satellite travel in one day? And, what is the orbital velocity (in m/s)? I'm completely lost. I haven't ...
Thursday, June 23, 2016 by Leslie

General Physics
Clarification: this is calculus-based physics, so the methodology is not restricted to trigonometry only. I have two questions, so hopefully I can divide them up nice and evenly. Also, if you know where I should copy and paste proper vector notation from, please tell me so I ...
Thursday, June 23, 2016 by Justin

Math
The path of a satellite orbiting the earth causes it to pass directly over two tracking stations A and B, which are 35 mi apart. When the satellite is on one side of the two stations, the angles of elevation at A and B are measured to be 87.0° and 84.2°, respectively...
Wednesday, June 22, 2016 by Jennifer

Earth science
the land will heat up the most because _____ ???
Wednesday, June 22, 2016 by Nikki

Earth science
How do the heating of land and water compare?
Wednesday, June 22, 2016 by Nikki

Physical Science
Many people mistakenly believe that the astronauts who orbit Earth are "above gravity." Earth's mass is 6×1024kg, and its radius is 6.38×106m (6380 km). Use the inverse-square law to find a height above Earth's surface at that the force of gravity...
Tuesday, June 21, 2016 by Hannah

Physical Science
Using the formula for gravity, find the force of gravity on a 0.80-kg mass at Earth's surface. (The mass of Earth is 6×10^24kg, and its radius is 6.4×10^6m.).
Tuesday, June 21, 2016 by Hannah

science
The occurrence of earthquakes along plate boundaries indicates that the 1) plates are stationary 2) earth will eventually break apart 3) earth is shrinking 4) coast of California will break off and slide into the ocean 5) plates are moving
Tuesday, June 21, 2016 by Anonymous

math
radio signal travels 3.00*10^8 meters per seconded. how many seconds will it take for a radio signal to travel from a satellite to the surface of earth if the satellite is orbiting at a height of 3.54*10^7 meters? I am so confused @Mrssue
Monday, June 20, 2016 by lory PLEASE HELP!

urgent help please i have an exam !!
A light pole of height 15 meter has a lamp hanging at its top . from a distance 12 meter from the base of the pole , a ball is thrown vertically upwards with velocity 5m/sec . find the rate at which the shadow of the ball on the earth moves away from the base of the pole after...
Friday, June 17, 2016 by Momen

Math
A light pole of height 15 meter has a lamp hanging at its top . from a distance 12 meter from the base of the pole , a ball is thrown vertically upwards with velocity 5m/sec . find the rate at which the shadow of the ball on the earth moves away from the base of the pole after...
Friday, June 17, 2016 by Momen

science
The mass of the girl in earth is 24kg. What is her mass and weight in moon if the moon's gravity is 1/6 of the earth' gravity?
Wednesday, June 15, 2016 by angela

physics
In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 532 N, to ...
Tuesday, June 14, 2016 by sonam

Physics
A satellite experiences a gravitational force of 228 N at an altitude of 4.0xE7 m above Earth. What is the mass of this satellite ?
Tuesday, June 14, 2016 by L

Physics
A 620 kg satellite orbits the earth where the acceleration due to gravity is 0.233 m/s^2. What is the kinetic energy of this orbiting satellite?
Tuesday, June 14, 2016 by L

Math
Lined up 6.7 billion people assume that each person occupied 12inches of the line.how many times around earth would they reach
Monday, June 13, 2016 by Vonn

English
"When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume among the powers of the earth, the separate and equal station to which the Laws of Nature and of Nature's God...
Sunday, June 12, 2016 by MK

Science
The Environmental Defense Fund, The Friends of the Earth, and The Natural Defense Council, are all divisions of The Environmental Protection Agency. True*** False After the first Earth Day, the Sierra Club expanded to 20 states in 1970. In 1971, the anti-environmental group ...
Sunday, June 12, 2016 by Kaai97

math and science
A space shuttle with a mass of 4,06 X 10kg,orbits earth at a height of 720km above the surface of the earth.calculate the gravitational force experienced by the shuttle
Sunday, June 12, 2016 by Tsuu-mani

Physics
You use a rope to slowly pull a sled and its passenger 45 m up a 20∘ incline, exerting a 125-N force on the rope. How much work did Earth do on the sled for the trip in Part B? The answer for part is -5630 J I'm not sure what to do. I tried -5630 J * 9.8 then I tried...
Saturday, June 11, 2016 by T

Physics
You recently read that a new possibly habitable planet was discovered. The planet, Burt, receives 1700 W/m2 from it’s companion star. If planet Burt has a a radius of 6500 km and acts like a blackbody ( emissivity =1 ) and thus radiates same amount of energy it absorbs, ...
Saturday, June 11, 2016 by Anonymous

Physics
ou recently read that a new possibly habitable planet was discovered. The planet, Burt, receives 2100 W/m2 from it’s companion star. If planet Burt has a a radius of 7500 km and acts like a blackbody ( emissivity =1 ) and thus radiates same amount of energy it absorbs, ...
Friday, June 10, 2016 by Anonymous

Physics
At high noon (sun rays fall perpendicular to the surface of the earth), the sun delivers 990 W to each square meter of a blacktop road, emissivity of 1 (blackbody). If the hot asphalt loses energy only by radiation, what is its equilibrium temperature? I have everything ...
Friday, June 10, 2016 by Anonymous

Science
Your journey to the centre of the earth took 64 hours at 100km/h. What was the total distance you traveled??
Thursday, June 9, 2016 by Kim

Math
1. Subtract (4x + 2y) – (8x – 3y). –4x – y 12x – y 12x + 5y –4x + 5y 2. Determine the best name for the quadrilateral. Graphic rectangle rhombus trapezoid parallelogram 3. Which figure has rotational symmetry for an angle of rotation of 270°? ...
Wednesday, June 8, 2016 by Help me PLEASE

Math help plz??
24. A radio signal travels at 3.00 x 10^8 meters per second. How many seconds will it take for a radio signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height of 3.54 x 10^7 meters? im guessing its 118 seconds but im not sure..
Tuesday, June 7, 2016 by othilia

Science
what the definition of age range in earth science?
Monday, June 6, 2016 by Jessica

Math
As the earth revolves around the sun, distant objects can be seen from different locations. This idea can be used to measure the distance between earth and nearby stars and is called stellar parallax. To see how this process works, consider the simplified scenario below. A.) A...
Sunday, June 5, 2016 by Cameron

Science
can you guy check my answers for science 1. Which of the following is ture about the electric charges below? A. The ball on the right had a positive charge and the ball on the left has a negative charge. B. The ball on the left has a positive change and the ball on the right ...
Sunday, June 5, 2016 by checking my answers

maths
the longest and shortest distance of eareth from sun are r1 and r2. what is the distance of the earth from the sun when it is perpendicular to it
Sunday, June 5, 2016 by lekshmysuresh

Earth Science
Why are boats more efficient than airplanes? They use less fossil fuels to move
Saturday, June 4, 2016 by mike

Physics I (Classical)
Determine the magnitude of the centripetal acceleration of an object on the surface of the Earth at a latitude of 71.6°. Consider the Earth to be a sphere of radius R = 6.38 ✕ 106 m.
Friday, June 3, 2016 by Victoria

English
Khianna is preparing an informational presentation for her science class. Her presentation discusses three different theories about what killed the dinosaurs 65 million years ago. The first theory is that an asteriod hit the earth, the second theory is climate change, and the ...
Friday, June 3, 2016 by Bob

Math help plz??
i just need a little help...with this A radio signal travels at 3 x 10^8 meters per second. How many seconds will it take for a radio signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height of 3.54 x 10^7?
Wednesday, June 1, 2016 by othilia....yes you prob know me...

SCIENCE PLZZ HELP!!!
____ is rate of change of position. Speed Velocity Acceleration Displacement 2. Which of the following is the difference between speed and velocity? direction units speed none of the above 3. A planet is discovered that is the same size as Earth and has the same gravitational...
Sunday, May 29, 2016 by gabby

earth science
state the mostly reason for the differences in the weathering rate of the three rock materials
Wednesday, May 25, 2016 by Celest

CHECK MY WORLD HISTORY ANSWERS
* at the end of each question and a couple **** at the end of my answer 1. All of the following can be identified as being part of the counterculture which arose with Baby Boomers during the 1960’s EXCEPT: * a. “Don’t trust anyone over 30” b. Woodstock c. ...
Tuesday, May 24, 2016 by Anonymous

earth science
When I bumped the table, the coffee in my cup spilled out. Newton's _____ law explains this reaction. 1st 2nd 3rd
Tuesday, May 24, 2016 by r

social studies
1. Some Polynesian islands are ring­shaped coral islands that surround a body of water, or (1 point) copra. coral. atolls. plates. 2. In the mid­1800s, what event played a part in the large increase in British immigration to Australia? (1 point) Aborigines moved to the...
Monday, May 23, 2016 by HELPPPPPP

grade 9
A 40m deep well with radius 3.5m is dug & the earth taken out is evenly spead to from a platform of dimension 28m by 22m.find the heght of the platfoem?
Sunday, May 22, 2016 by fira

science
Tom is making the locations of the active volcanoes on a world map. Explain how the locations of the volcanoes are related to earth's plates? please help me im begging you
Thursday, May 19, 2016 by please help

math
The volume of Jupiter is about 1.43*10^15 cubic kilometers. The volume of Earth is about 1.09*10^12 cubic kilometers. The number of Earths that can fit inside Jupiter can be found by dividing Jupiter's volume by Earth's volume. Find this quotient and express the answer...
Thursday, May 19, 2016 by Claire

Science
Explain the law of motion needed to solve this problem and then solve it. On Planet Zorg a 30 kg barbell can be lifted by only exerting a force of 180 N. What is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change if on Earth. Is it ...
Wednesday, May 18, 2016 by Aiecha

Science
If the earth exerts a 500 N gravitational force on an object in near space, how much force does this object exert on the earth, and by what law can this be asserted?
Wednesday, May 18, 2016 by Alyssa

Language arts
1. Read the sentence from "Zoos: Joys or Jails?" What clue word is used to show contrast between the two points of view? "Although the circumstances and reasons for animals being in zoos vary, its concept has faults many don't notice during their visit with ...
Tuesday, May 17, 2016 by Polar

Math3(Reiny Please Help)
An object on Earth falls with an acceleration of a=9.81 m/s^2. A function exists between the height from which the object falls, the initial velocity of the object and the time the object spends in the air. h(t)= Vt + at^2 V=initial velocity. T= time. A= acceleration due to ...
Tuesday, May 17, 2016 by Heaven

math
an agriculture field is rectangular, with dimensions 100m by 42m.a 20 m deep well of diameter 14 m is dug in a corner of the field and the earth taken out is spread evenly over the remaining part of the field.find the increase in the level of the field
Tuesday, May 17, 2016 by abel

Biology
Describe the traits that distinguish animals from other organisms Explain the diversity of invertebrates, chordates, and primates using the theory of evolution Describe the structures and body systems of animals that allow them to maintain homeostasis Describe the structures ...
Monday, May 16, 2016 by lola

Science
Historical models of the solar system include: A.Helliocentric,B.nebular,C.Geocentric model or earth centered universe and a _ model or sun centered universe
Monday, May 16, 2016 by Hailey

chemistry
The pressure of the earth's atmosphere at sea level is 14.7 lb/in2. What is the pressure when expressed in kg/m2? (2.54 cm = 1 in., 2.205 lb = 1 kg) 2.62×102 kg/m2 5.02×104 kg/m2 4.30×10-3 kg/m2 2.09×10-2 g/m2 1.03×104 kg/m2
Sunday, May 15, 2016 by Ha

physics
at what attitude the value of g would become one forth than on the surface of the earth?
Sunday, May 15, 2016 by zoya

Science
The moon is about 384000 km the earth and its paths around earth is circular. The moon taken 24hr to complete one orbit. The speed at which the moon orbits the earth in km/ hour is
Sunday, May 15, 2016 by Ali

Science
Where is most of the surface water on earth found? a) as freshwater in rivers b) as frozen water near the pole c) as groundwater under the surface d) as salt water in oceans I think its either A or D. Am I correct?
Thursday, May 12, 2016 by Val

Science PLEASE CHECK ALL
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...
Tuesday, May 10, 2016 by Karen

English
“One day, as I scanned the sandy expanse of Northern Africa, I couldn’t find any of the familiar landmarks—colorful outcroppings of rocks in Chad, irrigated patches of the Sahara. Then I realized they were obscured by a huge dust storm, a cloud of sand that ...
Tuesday, May 10, 2016 by quick help needed

Science CHECK ALL
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...
Monday, May 9, 2016 by Karen

1question last one plz help meeeeeeeeeeeeeeeeeeeee
5. Identify the benefits that your space mission might provide for modern society. Explore the possibility of connecting your space mission with satellites that are already gathering information as they orbit Earth. I DONT UNDERSTAND THIS ONE QUESTION I UNDERSTAND THE REST...
Monday, May 9, 2016 by MS.SUE,DAMON,REED ANYONE

PLZ HELP MT MIND WILL EXPLODE I DONT UNDERSTAND!!!
4. Explain the data you will want to collect on your mission, and list the instruments that you’ll need so that you can collect and store samples while on your mission. Describe how any collected data will be used when you return from your mission. 3 points 5. Identify ...
Monday, May 9, 2016 by I NEED HELP ASAP

Check my answers? Science
The order of events and ages of rocks by examining positions is *relative dating*. Gaps in rock layers are called *unconformities*. What uses properties of atoms to find ages of rocks? *Absolute Dating*. A life form in Precambrian Time was *Cyanobacteria*. What signaled the ...
Monday, May 9, 2016 by Ava

physics
Calculate the angular momentum of the Earth the arises from its spinning on its axis. Also calculate the angular momentum of the Earth that arises from its orbital motion around the sun. Please help I'm stumped on a take home test.
Sunday, May 8, 2016 by nouh

English
“One day, as I scanned the sandy expanse of Northern Africa, I couldn’t find any of the familiar landmarks—colorful outcroppings of rocks in Chad, irrigated patches of the Sahara. Then I realized they were obscured by a huge dust storm, a cloud of sand that ...
Sunday, May 8, 2016 by quick help please

PHYS 400
The gravitational potential energy of a low-Earth orbit satellite has been estimated at 1.5 million joules. If the satellite has a mass of 417 grams, and g=9.8ms-2, at what altitude (in meters) is the satellite orbiting? Give your answer to the nearest meter.
Sunday, May 8, 2016 by odee

Math
A40m deep wellwith radius 3.5m is dug and the earth taken out is evenly spread to form a plat form ofdimensions 28mby 22m. find the height of the platform.
Saturday, May 7, 2016 by Hiwot

Science one question dont understand plz help ASAP
i know that from earth to the moon is 238,855 miles but i dont know how much that is in months
Wednesday, May 4, 2016 by Thikra

Science
The tracks of the astronauts who landed on the moon are still there in the dust and show no signs of being worn away. This is attruted to the lack of atmosphere on the moon. Which of the following best accounts for the lack of atmosphere. 1)the moon's weak gravity 2)the ...
Wednesday, May 4, 2016 by Zay

mqth and science early childhood
​Children do not need a variety of concrete experiences that enable them to learn the properties of Earth's materials
Wednesday, May 4, 2016 by latavia robinson

math nid this asap tyy
(Velocity and acceleration.) The acceleration of gravity on the surface of the Moon is a = 1.6 m/s2, as opposed to g = 9.8 m/s2 on Earth. An Olympic high-jumper can jump to about 2.35 m on the surface of the Earth. What height could an Olympic high-jumper reach on the surface ...
Wednesday, May 4, 2016 by Than

Biology
What percentage of animals on earth are vertibrates? 5% 25% 50% 95%
Tuesday, May 3, 2016 by Lala

science
Tom is markina locations of active volcanoes on a world map explain how the locations of the volcanoes are related to Earth's plates
Tuesday, May 3, 2016 by kyle

Science
1. Which of the following is the correct definition of minerals? A) A naturally occurring, inorganic solid that has a crystal shape and definite chemical composition. B) A naturally occurring, inorganic solid that forms through crystallization of melted materials. C) A ...
Monday, May 2, 2016 by Tim

Earth science
What is an example of a stable system? How were you able to determine whether or not this system is stable? Please don't attach files, my parents do not allow me to click on any attached files!
Monday, May 2, 2016 by Please help!!!!!!!

Math
24. A radio signal travels at 3.00 x 10^8 meters per second. How many seconds will it take for a radio signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height of 3.54 x 10^7 meters?
Sunday, May 1, 2016 by Leet Speaker

LA
2. Read the passage. What technique is the author using to develop point of view? "Though zoos are meant to be a joy to viewers and teach lessons about our earth, the zoo jails its inhabitants and passes on faulty knowledge." a. state a claim b. persuasive language c...
Sunday, May 1, 2016 by Fred

Language Arts, can anyone check?
1. Which statement is shared by both "Zoos: Joys or Jails?" and "Why Do We Need Zoos?" a. clearly stated claim b. humorous introduction c. unsupported facts d. one-sided argument 23 Read the passage. What technique is the author using to develop point of ...
Sunday, May 1, 2016 by Fred

Chemistry
1. Before the Industrial Revolution, the concentration of CO2 in Earth’s atmosphere was about 275 ppm. Considering the effect of CO2 only, calculate the effect that the increase in CO2 has had on the pH of precipitation
Saturday, April 30, 2016 by Jana

Science Check answers
2) What phenomenon naturally warms Earth's lower atmosphere and surface? • the formation of sunspots • changes in the shape of Earth's orbit • global warming (MY ANSWER) • the greenhouse effect 3) Which of the following is an example of human impact...
Friday, April 29, 2016 by Jessica

LA, Check!
Read the statements Which group is contrasting in point of view? A. "Some people feel that there is lots of wild space that animals should only live there. Other people feel that there is very little wild space left." B. "Humans are destroying the Earth's ...
Thursday, April 28, 2016 by Lauren

lang art
1. Read the sentence from "Zoos: Joys or Jails?" What clue word is used to show contrast between the two points of view? "Although the circumstances and reasons for animals being in zoos vary, its concept has faults many don't notice during their visit with ...
Thursday, April 28, 2016 by heeeeelpppp

Re-post - Science - from Spitfireredhead
Posted by SpitFireRedHead on Wednesday, April 27, 2016 at 8:23am. Please check this. Thanks! 1. Which of the following shows fossils as evidence of continental drift? a. Limestone layers in the Appalachian Mountains of North America were exactly the same as the limestone in ...
Wednesday, April 27, 2016 by Writeacher

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Homework Help: Science