1. Physics

    a canon fires shell at 300m/s. at what angle must it aim to hit a target 5.0km away?
  2. earth science

    which term is best defined as a measure of the amount of space a subtance occupies? volume It looks like you have answered your own question. If it is three dimensional, it is volume. However, if it is two dimensional, it is area. I hope this helps a little more. Thanks for ...
  3. 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 ...
  4. 3rd grade English

    I'm trying too see if my daughter is doing her homework correctly .... The question is use each word or phrase as the subject of a sentence .add a verb describing an action that takes place in the present . Make sure each verb agrees with its subject Her answer was - the earth...
  5. spanish

    Part 4—Listening Comprehension Directions: Listen to this short story called “What ought a man to do on earth?”—¿Qué debe hacer sobre la tierra un hombre? You will hear the story two times. After listening to the story, answer these questions. 17. How many ministers ...
  6. physics

    ( 1.) A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is not true?< (A) The passenger is in motion relative to the passer-by (B) The passer-by is stationery relative to the ...
  7. Earth Science

    A classification system is based on the use of (1)the human senses to infer properties of objects (2)instruments to infer properties of objects (3)observed properties to group objects with similar characteristics Is it (3)?
  8. HISTORY

    Does this sentence make any sense and is it accurate? The Soviet Union, however, rejected the Marshall Plan due to the belief that they could not keep a close eye on the satellite states in the Eastern bloc and that the West was trying to enforce their democratic ideas. ++++ ...
  9. Physical Chemistry

    The escape velocity, the velocity required by an object to escape from the gravitational field is given V^e = (2gr)^1/2 where r is the radius for Earth (6.37 x 10^6m). At what temperature will the c of an H2 molecule and of an N2 molecule attain the escape velocity?
  10. Algebra 1

    What is the solution to the system? use elimination . -18.6x+ 17.2y=90.2 14.2x+ 3.4y= -35.8 a.(3,2) b.(-3,2) c.(2/3,4/9) d.(2,3) IS IT D?? Terry and ed start a lawn mowing business and purchase mowers and equipment for $800. They charge $20 for each lawn and $4 worth of gas ...
  11. English

    1. What are the dangerous things which can happen around us? (Is this OK?) 2. What did Mina's friends and Giho's friends each submit homework about? 2-1. About what did Mina's friends and Giho's friends each submit homework? (Are both correct? Which one is a colloquial ...
  12. 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.
  13. Health - Law and Ethics - HIPAA

    We are to go to the hhs.gov sire and reaserch the site for answers to questions below. Be sure to carefully read the PDF file “Summary of HIPAA Privacy Rule.” (Note that covered entity means those who are subject to the HIPAA rules—like health plans, doctors, hospitals, ...
  14. Physics

    At what speed must one frame of reference be moving relative to another for the two frames to disagree about lengths by 1%? Express your result as a fraction of the speed of light. At what speed must one frame of reference be moving relative to another for the two frames to ...
  15. math/117

    Could someone look over this paper before I turn it in? Thanks Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of...
  16. Physics

    You (m=75.0 kg) are floating outside your space station, and- oh no- a siren sounds, and the doors start to close! At the instant the siren sounds, you are exactly 10.0 m from the station doors and floating away from the space station at a speed of 1.00 m/s. The doors will ...
  17. physical geography

    A-When Magellan’s crew left Spain to sail around the world, it took nearly three years to return to spain. Although Magellan had died, and only a skeleton crew arrived back in Spain, they had the incorrect day on their calendars, they were a day behind, although accused of ...
  18. computers

    TMA1PHY111 ( 1.) A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is not true?< (A) The passenger is in motion relative to the passer-by (B) The passer-by is stationery relative ...
  19. Algebra

    Thank you bobpursley. In question 2, if sea level is 3963 miles from the center of the earth can I change the equation to figure out the weight of a 100 pound weight at lea level by doing something like this? 100=sqrt C/3963^2 ?
  20. Chemistry

    A gas-filled balloon having a volume of 3.50 L at 1.2 atm and 25°C is allowed to rise to the stratosphere (about 30 km above the surface of Earth), where the temperature and pressure are −23°C and 3.00 10−3 atm, respectively. Calculate the final volume of the ...
  21. Science

    Hello! I need help on this one question. I know that the Earth's gravitational force pulls the train towards the ground, but I do not understand how the other forces act on it. Explain how gravitational, electrical, and magnetic forces act on a maglev train. Thank you for any ...
  22. Physics question bout falling

    Objects that are falling toward Earth in free fall move a)faster and faster. b)slower and slower. c)at a constant velocity. d)slower then faster.
  23. Physics

    Help please A wire carries a current of 5.2 A from east to west through a 6.0 m section of wire in the earth's magnetic field of 1 × 10^-5 T at a location where the magnetic field points south. What is the magnitude of the magnetic force acting on the wire? 3.1 × 10^-4 N 3.1...
  24. earth

    an area of high pressure is referred to as a anticyclone, and an area of low pressure is called a cyclone. is percipitation generally accosiated with a cyclone or anticyclone?
  25. EARTH SCIENCE

    What are some observations about our solar system that are explained by the nebular hypothesis? Are there any observations that are not easily explained by the nebular hypothesis?
  26. Science

    The force of gravity on an object on the surface of Mars is less than the force of gravity on an identical object on the surface of Earth. Which of the following explains why this is true?
  27. science

    An astronauts boots weigh 100N on earth where the acceleration of free fall is 10m/s2. How much will they weigh on Mars where the acceleration of free fall is 4m/s2?
  28. science

    An astronauts boots weigh 100N on earth where the acceleration of free fall is 10m/s2. How much will they weigh on Mars where the acceleration of free fall is 4m/s2?
  29. chem

    Which shows the greatest metallic character? -Na -K -Rb -Cs Also, What ions are very important for the proper functioning of biologic systems such as nerves and muscles? --oxygen ions --nitride ions --alkali metal ions --alkaline earth metal ions --hydrogen ions
  30. physics

    above the earth, a 500nT magnetic field captures particles coming from the sun. If a proton moving at 600km/s runs into this magnetic field, what is the radius of motion of the proton? and also how long does it take the proton to travel in one circle?
  31. science

    Geologists have divided the history of the earth into four different eras. Which era below is not one of the four? a) Mesozoic Era b) Cenozoic Era c) Precambrian Era d) Stone Era e) Paleozoic Era Just need to know if my answer or right or wrong. Thanks! :) c
  32. Math

    Satelite orbits vary in their distance from the earth. Orbits can be anywhere from 252,800 to 35,200,000 yards. What is the greatest distance between satelite orbits? Round to the nearest ten thousand to estimate. For problem 3, find the exact difference
  33. science

    which of the following will make it harder in the future to develop sustainable methods for humans using resources? A. there will be fewer renewable resources B.more humans will populate the earth C.biodiversity naturally reduces over time D.more humans will recycle materials
  34. Science

    "Earth's energy sources include both renewable and nonrenewable resources. Name at least three sources of energy that could be used in your house. Then describe the ideal source of energy for generating most of your home's electricity, and explain why you chose that source."
  35. science

    Earth's energy sources include both renewable and nonrenewable resources. name at least three sources of energy that could be used in your house. then describe the ideal energy source for generating most of your home's electricity, and explain why you choose that source
  36. Science

    Earth's energy sources include both renewable and nonrenewable resources. Name at least three sources of energy that could be used in your house. Then describe the ideal energy source for generating most of your home's electricity, and explain why you chose that source.
  37. Word Problems

    Will someone please write an expression for these? I am horrible at this, i will solve them though. 1.) Logan withdrew $32 from her bank account. After her withdrawal, her balance was $8. How much was originally in her account? 2.)The baseball birthday batter package at a ...
  38. science

    what is a earthquake look it up in a dictionary science is hard but hang in there If you want to read about earthquakes, an encyclopedia can give much information. Look on plate tectonics. The core of the earth is very hot and consists of molten magma. There are a number of "...
  39. EARTH SCIENCE

    How are carbon dioxide and other trace gases thought to be potentially related to global warming? Are the levels of these gases in our atmosphere increasing or decreasing? Why? Finally, what are some of the observed climatic trends and possible consequences associated with ...
  40. Earth Science

    What are the sequences of weather events a city goes through when an idealized, middle latitude,mature cyclone that hasn't developed an occluded front passes over it. Assume the center of the wave cyclone passes, west to east, at 150 to the north of the city.
  41. Stuctures of the Earth

    If you measure one thing, its gives you clues about something else. Give an example. I am not seeming to understand this question. It kind of tends to relate in with theories and such that scientists have made by doing investigations which have provided them clues about other ...
  42. Physics

    At what rate will a pendulum clock run on the Moon, where the acceleration due to gravity is 1.63 m/s2 , if it keeps time accurately on Earth? That is, find the time (in hours) it takes the clock’s hour hand to make one revolution on the Moon. provide solutions and ...
  43. physics

    A flying-saucer shaped fairground ride is rotating in a horizontal plane. If the rider’s circular path has a radius of 8 m, at how many revolutions per minute the ride should spin in order for the rider to feel a centripetal acceleration of about 1.5 times Earth’s ...
  44. Math

    There is a population of 6.848 billion people. There are roughly 57.9 million square miles of land on Earth, of which about 22% are favorbale for agriculture. Round answer to the nearest person. There are ___ people/ mile^2 of farmable land. I DIVIDED 6.848BILL / 57.9MILL & ...
  45. english poetry

    What effect does Bryant’s use of personification of nature have on the theme of the poem "Thanatopsis"? Thanatopsis William Cullen Bryant (1794 – 1878) To him who in the love of Nature holds Communion with her visible forms, she speaks A various language; for his gayer ...
  46. Economics

    Professor Martin is considering leaving the university and opening a consultant business. His services as a consultant he would be paid $75,000 a year. To open the business professor Martin must convert a house from which he collects rent of $10,000/year for office space and ...
  47. SPANISH

    HOW DO i WRITE A SENTENCE IN SPANISH ABOUT MY FAMILY Do this: Start with a sentence about your family in English. Then translate it to spanish. Get your dictionary out. We will be happy to check it for you. mi famila es grande, el amar y bueno Thank you for using the Jiskha ...
  48. English

    Hello! Need some ideas and suggestions.How can I explain to the learners of English as a foreign language (4th grade, 4th year of learning) the following two things: 1.They have a picture of a traffic in the street in their books. First they are repeating the names of the ...
  49. Physics please check

    As you climb a mountain, your ears "pop" because of the changes in (a) In which direction does your eardrum move as you climb up? inward outward eardrum does not move Give your reasoning. I think the eardrum moves outward because the further you go away from the earth's center...
  50. anthropology

    Is my answer correct First describe how colonization and globalization have affected sociopolitical systems, and then discuss how political systems change. Give examples for each objective. Colonization is the practice of one country taking over another with their people. ...
  51. Earth and Space Science

    Clouds form primarily at the boundary between a)the stratosphere and mesosphere b)the mesosphere and ionosphere c)the troposphere and mesosphere d)the troposphere and stratosphere e)the hydrosphere and troposphere
  52. English

    Can you please check these sentences, please? Thank you very much for your previous corrections! 1) How can I get to school? Can you tell me the way to school, please? 2) Do you know the bank in Cross Street? Is Oxford street the road near the station? Yes, it is. 3) You have ...
  53. Physics 2

    A 60 cm long wire is oriented from east to west directly above the equator and carries a current of 5 A (toward the east). What is the magnitude and direction of the magnetic force on this wire due to the earth’s magnetic field (30 µT oriented south and north)?
  54. Pre-Calculus

    Two cities are due north of each other. One city has a latitude of 32¢ª45'12" and the second city has a latitude of 51¢ª12'45". Assuming that the earth is a sphere with a radius of 4000 miles, how far apart are the two cities?
  55. Physics help!

    The earth has an electric field of about 150 N/c pointed downward. A 1.00 (micrometer) radius of water droplet is suspended in a calm air. Find the 1) mass of the water droplet 2) charge on the water droplet 3) number of access electrons in the water droplet.
  56. Science

    Because the tilt of Earth's axis always points in the same direction, the seasons in the Northern and Southern Hemispheres are always _______ Options: A : Same B : Opposite C : three months apart. D : six months apart. PLEASE HELP ME ASAP
  57. statistics

    In the case of Castaneda vs Partida, it was noted that although 80% of the population in a Texas county was Mexican-American, only 39% of those summoned for grand juries were Mexican-American. Assume that 12 jurors are to be summoned from a population that 80% Mexican-American...
  58. Math(Please check answers)

    1) Solve the equation: 15(7x-6) = 3x-5 My answer is (-85/108) 2) Mary and her brother collect coins. Mary has 4 times the number of coins that her brother has. Together they have 175 coins. How many does Mary have? My answer is 140 3) Perform the indicated operations. Express ...
  59. Math/117 University of Phoenix

    Could someone look over this paper before I turn it in? Thanks Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of...
  60. calculus

    newtons law of gravitation says that the magnitude F of the force exerted by a body of mass m on a bod of mass M is F=GmM/r^2 where G is the gravitational constant and r is the distance between the bodies. a)find dF/dr and explain its meaning. What does te minue sign mean? b)...
  61. Bio 100

    I am researching a few animals for a scientific taxonomy and earth's biodiversity paper, and I am having trouble with one area... I chose the nine-banded armadillo and I need to answer this question....To what order does the mamal species you selected belong? Describe why it ...
  62. Bio 100

    I am researching a few animals for a scientific taxonomy and earth's biodiversity paper, and I am having trouble with one area... I chose the nine-banded armadillo and I need to answer this question....To what order does the mamal species you selected belong? Describe why it ...
  63. Physics

    A very important experiment was carried out at the end of the 1800’s involving testing for the speed of the earth through the ether. (a) State the name of this experiment (b) Describe why the light beams are perpendicular to each other at one stage of the experiment. (c) ...
  64. Environmental Sciencee

    Please help me on this question: 33. Wind and water alter the Earth's sufrface by a. blowing away soil and eroding soft rocks b. eroding coastlines c. carving deep gorges d. all of the above I read about this a long time ago, so I don't even remember where it is in my book. ...
  65. Physics

    The plane tectonic theory describes the motion of the continents across the face of Earth. Measurements suggest that Africa and South America were once connected and are drifting apart at an average rate of 3cm/yr. If the two continents are now 7x10^8 cm apart, how long has ...
  66. 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 except...
  67. Science

    A person roller skates down a street heading West. What is true about friction in this case? the choices are 1- does not effect the skates 2- pulls the skates eastward 3- pulls the skates downward toward the center of the earth 4- pulls the skates westward my answer is # 4
  68. Science

    A person roller skates down a street heading West. What is true about friction in this case? the choices are 1- does not effect the skates 2- pulls the skates eastward 3- pulls the skates downward toward the center of the earth 4- pulls the skates westward my answer is # 4
  69. Math

    1,6,3,7,9,4,5,7=17 only plus or minus can be out in between the numbers and they must stay in the order shown EX. 1-6+3-7+9-4+5+7=17 It must equal 17 Here's a hint. Add all the numbers up first, then see what number needs to be subtracted in order to get 17. Then find a ...
  70. English

    1. He is honest in himself. (Is this sentence grammatical? What is the meaning of 'in himself' then?) 2. He must be angry because she's not saying anything. 3. He has to be angry because she's not saying anything. (Are both the same and grammatical?) 4. He must have been angry...
  71. Chemistry Logic

    How can I tell a conjugate base from a regular base and a conjugate acid from a regular acid? For example, in: H2O + HONH3 (reversible arrows) HONH2 + H3O+ What is the acid, base, conjugate base, conjugate acid? Is there no base and conjugate base since HONH3 is an acid? The ...
  72. math

    on earth, in the absence of air, the rock in excersise 13 would reach a height of s=24t- 4.9t^2 meters in t seconds. How high would the rock go? (exercise 13:a rock thrown vertically upward from the surface of the moon at a velocity of 24m/sec reaches aheight of s=24t-0.t^2.
  73. Science

    Can someone please help me with these questions below thank you. 1. What do you think the impact of the earth's climate will be like if everyone enjoyed the same lifestyle? 2. What will it be like for The health of ecosystems and biodiversity? 3. What will the impact be like ...
  74. HELP I DON'T UNDERSTAND THIS QUESTION !

    Earth's energy sources include both renewable and nonrenewable resources. Name at least three sources of energy that could be used in your house.Then describe the ideal energy source for generating most of your home's electricity and explain why you chose that source.
  75. Math

    A plane leaves an airport A (38.5N, 37.05W) and flies dues North to a point B on latitude 52N (a) Find the distance covered by the plane (b) The plane then flies due east to a point C, 2400km from B. Determine the position of C Take the value ∏ of as 22/7 and radius of ...
  76. Earth Science

    Quartz is made up of___________ a.)silicon and oxygen b.)iron and oxygen c.)silicon and carbon d.)iron and silicon
  77. Math

    If a valid time on a 12 hour time period has the hour hand and minute hand switched, how many times will that result in another valid time? I have found 11, which is when the hour hand points at the same place as the minute hand. I know there is much more, but I can't figure ...
  78. Physics problem

    An object with a mass of 100kg is dropped from an 80 meter high building and leaves an impression in the ground of 15cm. A.What is the time needed to hit the ground? B. What is the speed of the object when it hits the ground? C. What is the coefficient of the friction between ...
  79. Physics problem

    An object with a mass of 100kg is dropped from an 80 meter high building and leaves an impression in the ground of 15cm. A.What is the time needed to hit the ground? B. What is the speed of the object when it hits the ground? C. What is the coefficient of the friction between ...
  80. java

    Write a menu driven program that either accepts words and their meanings, or displays the list of words in lexicographical order (i.e. as in a dictionary). When an entry is to be added to the dictionary you must first enter the word as one string, and then enter the meaning as...
  81. computer

    Write a menu driven program that either accepts words and their meanings, or displays the list of words in lexicographical order (i.e. as in a dictionary). When an entry is to be added to the dictionary you must first enter the word as one string, and then enter the meaning as...
  82. Science

    What would happen to an object if the force of gravity on earth was decreased by half A. It’s mass would decrease B. It’s weight would decrease**** C. It’s density would decrease D. It’s volume would decrease
  83. physics

    Two balls having different masses reach the same height when shot into the air from the ground. If there is no air drag, which of the following statements must be true? (More than one statement may be true.) A. Both balls left the ground with the same speed. B. Both balls left...
  84. science

    wat causes an apple to fall down from a tree a pulling force towards the tree or a pulling force towards the earth
  85. science

    what physical components do the sun and earth have in common ? a) core and mantle b) core and atmosphere c) crust and atmosphere d) mantle and crust
  86. Chemistry (Gas)

    A cylinder is filled with 120L of air at 101 kPa and 20*C. How long could the cylinder be used "just underwater" on earth assuming 2L is used every 5 seconds. I don't understand what the pressure and temperature would be "just underwater." Is it assumed that it is SATP?
  87. 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.
  88. chemistry

    ____?____g of glucose C6H12O6 must be dissolved in 400 g of water to give a solution that is 0.258 m(molality).
  89. spelling

    fifteen is to five as nine is to ? must start with one of the following :scr,spr,str, snd thr
  90. DrBob222

    For the medium to remain undisturbed as two pulses pass the same point, they must have. different amplitudes
  91. English/Spelling

    Analogies must start with scr, spr, str, thr 5 letters broom : sweep :: brush :
  92. english

    Complete the sentence below by interrupting it with two parallel if clauses: The problem of race relations, if………., and if………. must be solved.
  93. Caculus I

    If f is decreasing and f(20)=10, which of the following must be incorrect? Explain. a. (f^-1)'(20)=-3 b. (f^-1)'(10)=12 how do i work this problem? i'm kind of confused about inverse functions.
  94. Algebra

    GIven any positive integers, show that at least two must exist whose sum or difference is divisible by 10.
  95. Social Studies

    Research and Present findings on the countries that annually perform the hajj and it must be in a five year time?
  96. Geography

    Difference between ozone depletion and global warming Must include 2 cause, 3 effects, 3 solutions and 2 internet information
  97. chemistry

    How many grams of zinc must react with HCl in order to produce 4.35 liters of hydrogen gas, measured at STOP?
  98. world geography

    what do australia and new zealand must import? machinery and raw materials to set up export manugfactoring
  99. science

    look..i'm not really good in english..but i really2 need help here..why jellyfish must be in buoyancy of water group???
  100. 5th grade

    A glass flute does not expand with humidity so you must tune it before every use a. true b. false
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