1. Physics

    Two boys of the same mass, 45 kg, are on a playground merry-go-round that has a diameter of 4.0 meters. Both boys are at the very edge of the ride. One boy stands with the coefficient of friction between his shoes and eh ride being .45 whereas the other is on his knees with a ...
  2. Physics

    The power radiated by the sun is 3.90 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.50 1011 m. The earth's axis of rotation is tilted by 27° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator perpendicularly...
  3. maths

    16. A pole of length 10 m casts a shadow 2 m long on the ground. At the same time a tower casts a shadow of length 50 m on the ground, then find the height of the tower.
  4. Trigonometry

    The shadow of an electric pole is 5 m. long when thr angle of elevation of the seen is 60 degrees. Find the length of the shadow when the angle of elevation of the seen is 45 degrees
  5. math

    The shadow of an electric pole is 5 m. long when thr angle of elevation of the seen is 60 degrees. Find the length of the shadow when the angle of elevation of the seen is 45 degrees
  6. Geometry

    Two forces are pushing on an object, one at 12 lbs of Force and one at 5.66 lbs of Force. The angle between them is 35° (each is 72.5 from horizontal, such that the forces make a v with the object in the center). 17. What is the total Force on the object? 18. What is the ...
  7. Fluid Mechanics

    A circular disc having a diameter of 125cm is immersed in water so that the distance of its perimeter measured vertically below the water surface varies between 60cm and 150cm. Find the total force due to the water acting on one side of the lamina, and the vertical distance of...
  8. Physics

    In a city grid, each block o the east-west streets is 180 meters long. Each block on the north-south streets is also 180 meters long. A walker walks 4 blocks north and then 3 blocks east. How much father did the walker travel than the actual distance between the start and end ...
  9. physics

    In a city grid, each block on the east-west streets is 180 meters long. Each block on the north-south streets is also 180 meters long. A walker walks 4 blocks north and then 3 blocks east. How much farther did the walker travel than the actual distance between the start and ...
  10. History

    Which of the following statements is true regarding the Korean War? A. The Chinese armed and trained the North Korean army. B. Stalin was outraged by the North Korean attack on South Korea. C. Stalin approved the North Korean attack in advance. D. Both Stalin and Mao expected ...
  11. Physics

    At what distance above the surface of the earth is the acceleration due to the earth's gravity 0.790 m/s^2 if the acceleration due to gravity at the surface has magnitude .
  12. Algebra

    The mass of Earth is about 3 × 10-3 times the mass of Jupiter. The mass of Earth is about 6 × 10 24 kg. What is the mass of Jupiter? Give your answer in scientific notation.
  13. physics

    If the sun is 372 times farther from the Earth than the Moon, and the Moon is falling around the earth at 1.4 mm/s, what is the rate that the Sun is "falling?" Is it 1/(372^2) or 7.22*10^-6 mm/s?
  14. Calculus

    An air ambulance is travelling from Barrie to Toronto. Toronto is located 90 km [S5°E] of Barrie. If the wind is blowing from the South with a velocity of 62 km/h, and the plane’s air speed is 375 km/h, what direction must the pilot fly to make it to Toronto? What on earth ...
  15. Environmental Science

    On Earth in the extreme northern and southern latitudes, how does the relationship between GPP and NPP change during an entire year’s time?
  16. Environmental Science

    On Earth in the extreme northern and southern latitudes, how does the relationship between GPP and NPP change during an entire year’s time?
  17. Maths

    the speed of light is 3 * 10^ 8m/s. Jupiter is 778 million km from the sun. Calculate the number of minutes it takes for sunlight to reach Jupiter ? A star is 300 lights away from Earth. If the speed of light is 3 * 10^5 km/s. calculate the disatance from the star to Earth. ...
  18. Science

    Geologist believe that The crystals inside a geode probably form when... A: Lava suddenly cools on earth’s surface B: Minerals dissolved in a solution evaporate C: Minerals dissolved in a solution crystallize D: magma cools slowly inside Earth Ok so I’m Almost positive ...
  19. Chemistry

    11. Semiconductors (metalloids) have properties of both metals and nonmetals.-T? 13. Covalent bonding occurs when electrons are transferred from one atom to another.- F? 17. Bonding involves all the electrons in an atom.- T? 20. Nonpolar bonds form when electrons are shared ...
  20. Physics

    For two identical satellites in circular motion around the Earth, which statement is true? a. The one in the higher orbit has more kinetic energy b. The one in the lower orbit has more total energy c. The one in the lower orbit has less total energy d. Both have the same total...
  21. Physics

    For two identical satellites in circular motion around the Earth, which statement is true? a. The one in the higher orbit has more kinetic energy b. The one in the lower orbit has more total energy c. The one in the lower orbit has less total energy d. Both have the same total...
  22. Physics

    For two identical satellites in circular motion around the Earth, which statement is true? a. The one in the higher orbit has more kinetic energy b. The one in the lower orbit has more total energy c. The one in the lower orbit has less total energy d. Both have the same total...
  23. History

    After the First Seminole War, the Seminole tribe was __________. A.forced to move south to avoid settlement and the US government B.given old lands to the north to encourage assimilation C.forced to leave its lands and be removed to the West D.given lands lost by the Creek ...
  24. physics

    You're in an auto traveling at 25.0m/s toward a pole mounted warning siren. If the siren's frequency is 365 Hz, what frequency do you hear? Use 343m/s as the speed of sound.
  25. Chemistry

    A hypothetical covalent molecule, X–Y, has a dipole moment of 1.62 D and a bond length of 179 pm. Calculate the partial charge on a pole of this molecule in terms of e (where e is the charge on an electron).
  26. Math: Angles of Elevation and Depression

    the angle of elevation to the top of a flagpole is 40° from a point 30m away from The base of the pole.How high is the flagpole to the nearest meter?
  27. Physics

    The captain of a boat wants to travel directly across a river that flows due east with a speed of 1.09 m/s. He starts from the south bank of the river and wants to reach the north bank by travelling straight across the river. The boat has a speed of 6.44 m/s with respect to ...
  28. physics

    If a more complicated atom has two energy levels for its electrons at (-15) eV and (-30.1) eV, what is the wavelength of the photon (in nm) that is emitted when an electron transitions between these two levels?
  29. science

    I'm stuck on the following questions 1)The geocentric model of the universe states that the Earth is the center of the universe. This is an example of a A)scientific conclusion B)pseudoscience C)scientific law*** D)Scientific method Through process of elimination i know its ...
  30. Please CHECK thanks

    Please check and tell me what I got wrong and let me know the correct answer for the problem. Thanks. 1. Diarrhea can be caused by a change in diet and different minerals in the water. True (yes) False 2. Fusion produces less radioactivity than fission. True False (yes) 3. ...
  31. Physics

    Two 0.20 g metal spheres are hung from a common point by non-conducting threads that are 30 cm long. Both are given identical charges, and the electrostatic repulsion forces them apart until the angle between the threads is 20 degrees. How much charge was placed on each sphere?
  32. Math

    Three circular pipes with 30cm diamters are strapped together. Find the length of the strap to the nearest centimeter. I got the circumference of the circle which is 94.25cm but that's where i got stuck. Can you please help? you are wrong sorry to tell ya. the circumfrence of ...
  33. r n

    if two forces acting on a body at angle ¤ to each other and exerts a force of 20N,their resultant is 30N.what is the angle between them?
  34. Social Studies

    Why were Northern states in favor of Hamilton's protective traffic? The traffic protected the North from paying any additional fees when exporting their goods. The traffic allowed manufacturers in the North less expensive than imported goods. The traffic made goods produced in...
  35. algebra

    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 an object varies on different planets, but did you know that ...
  36. algebra

    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 an object varies on different planets, but did you know that ...
  37. college

    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 an object varies on different planets, but did you know that ...
  38. Math

    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 an object varies on different planets, but did you know that ...
  39. Science

    How did the brightness or intensity of the light change as the degree of tilt increased? Which degree of tilt produced light similar to what North America experiences in the summer? What would be the effect on the seasons and the northern and southern hemispheres if earth were...
  40. physics

    A 8.01-nC charge is located 1.95 m from a 4.06-nC point charge. (a) Find the magnitude of the electrostatic force that one charge exerts on the other. (b) Is the force attractive or repulsive?
  41. Science--Physics--check answers

    1. A football player pushes a dummy forwards at a constant 0.85m/s for 11m using 7150 J of energy. The dummy has a mass of 120 kg. Find the force the football player exerts, find the frictional force the dummy exerts. - for my answer I got 1176N as the force the football ...
  42. English

    I have three pictures. In Picture One, there are one green ball and one red ball. You can describe what you have in the picture using the phrase "one - the other." For example, I have two balls. One is green and the other is red. Can you make sentences like this containing the...
  43. Science

    3. Which of the following conditions would likely cause the activation energy to be high? A.atoms are close together B.the temperature is hot C.atoms are not close together * D.a catalyst is present 4. Which of the following materials will burn the fastest in open air? A.a log...
  44. Language Arts

    Which sentence contains a proper noun? A.We danced around the May Pole B.We went to a dance last weekend C.They ran in a special race every year D.Her mother came to watch the race Is the answer A?
  45. pre calc

    I am sooo confused on my homework. #1 Two cars lave an intersection at the same time. One is headed south at a constant speed of 30mph. the other is heading west at a constant speed of 40mph. Build a model that expresses the distance (d) between thec ars as a funtion of time (...
  46. Help w/this one again(Math!!)

    Write one or two equations to represent the situation below. Solve the equation(s). Show all your work. Two cars leave town going in opposite directions. The car heading north travels at 55 mph. The car heading south travels at 75 mph. How long will it take them to get 715 ...
  47. Physics

    I have a question about the International Space Station-Its been orbiting earth at 350km-If the radius of the earth is 6,370 km, what is the period of orbit for the Space Station? Secondly, if it was moved to a geosynchronous orbit, what would the new altitude of the station ...
  48. PHYSICS

    A yoyo of mass m=2 kg and moment of inertia ICM=0.09 kg m2 consists of two solid disks of radius R=0.3 m, connected by a central spindle of radius r=0.225 m and negligible mass. A light string is coiled around the central spindle. The yoyo is placed upright on a flat rough ...
  49. physics

    It takes you 7.6 min to walk with an average velocity of 2.5 m/s to the north from the bus stop to the museum entrance. How far did you walk? Answer in units of m What is your direction? (multiple choice) 1. West 2. North 3. South 4. East
  50. geography

    most known mineral deposits in the region are located: A)along thepacific coast and south of the equator B)along the atlantic coast and south of equator C)along the pacific coast and north of the equator D)along the atlantic coast and north of the equator my choose is a
  51. Physics

    A beam of protons is accelerated through a potential difference of 0.745 kV and then enters a uniform magnetic field traveling perpendicular to the field. (a) What magnitude of field is needed to bend these protons in a circular arc of diameter 1.75 m? (b) What magnetic field ...
  52. yes or no question

    hi i have to do a project where i have to find media bias between two articles for government. and i was wondering if it is okay if i could just post little pieces of those two articles and ask for help. when i read the two articles, it doesn't seem like it's bias but i just ...
  53. Physics

    In moving a 35.0 kg desk from one side of a classroom to the other, a professor finds that a horizontal force of 300 N is necessary to set the desk in motion, and a force of 185 N is necessary to keep it in motion at a constant speed. (a) What is the coefficient of static ...
  54. physics

    I am not sure how to setup this problem. I posted it earlier and "BOB PURSELY" responded we are happy to critique your thinking. I have know idea how to solve this problem or even where to start. Please help!!! A tetherball leans against the smooth, frictionless post to which ...
  55. Physics

    I am not sure how to setup this problem. I posted it earlier and "BOB PURSELY" responded we are happy to critique your thinking. I have know idea how to solve this problem or even where to start. Please help!!! A tetherball leans against the smooth, frictionless post to which ...
  56. Chemistry

    Use these answers for questions 4 - 7. (A) 1s2 2s22p5 3s23p5 (B) 1s2 2s22p6 3s23p6 (C) 1s2 2s22p62d10 3s23p6 (D) 1s2 2s22p6 3s23p63d5 (E) 1s2 2s22p6 3s23p63d3 4s2 4. An impossible electronic configuration 5. The ground-state configuration for the atoms of a transition element ...
  57. physics

    An astronaut weighs 696 N on the Earth. What is her weight on planet X, which has a radius Rx = Rearth 1.60 and a mass Mx = Mearth 8.60? -the only equation I know for weight is "w = m x g"...I don't know how to solve for w using force.
  58. Math

    The ocean covers about 71% of the Earth's surface. If the total surface area of the Earth is about 510 million square kilometers, how many square kilometers are covered by the ocean? 362.10
  59. Need Help Physics

    The captain of a boat wants to travel directly across a river that flows due east with a speed of 1.09 m/s. He starts from the south bank of the river and wants to reach the north bank by travelling straight across the river. The boat has a speed of 6.44 m/s with respect to ...
  60. Earth Science

    WAT IS THE DIFFERENCE BETWEEN SCIENCE AND TECHNOLOGY? plz help and thank you
  61. physics

    A force of 120.0 N is applied to 2.00 cm diameter piston in a closed container of water with a density of 1,000 kg/m2. What is the force on another piston with diameter of 25.0 cm connected to the container?
  62. Math

    I Need Help With Two Questions The First One Is Find The Distance Between Riverside And Milton If They Are 12 Cm Apart On A Map With A Scale Of 4 cm : 21 Km And The Second One Is Oak Grove And Salem Are 87 Mi From Each Other . How Far Apart Would The Cities Be On A Map That ...
  63. science + check over

    please check my answers + help me improve them. * 1.) explain why earth & other planets were not solid when they formed during the beginning of the precambrian, approximately 4,600 million years ago + what was this particular time period called & why is this time period not ...
  64. Somebody check this plz..and thanks.

    Please check and tell me what I got wrong and let me know the correct answer for the problem. Thanks. 1. Diarrhea can be caused by a change in diet and different minerals in the water. True (yes) False 2. Fusion produces less radioactivity than fission. True False (yes) 3. ...
  65. physics

    Which of these two bodies gets its internal heat from nuclear processes? A) Both.B) Sun.C) Neither.D) Earth.
  66. Physics

    Electrons are accelerated though a potential of 60V and then from a beam that hits two slits separated by 2.5x10^-8m. (a) What is the wavelength of these electrons (hint: first find the momentum)? (b) How far is the second order bright spot from the center spot on a screen 4....
  67. Physics

    How fast does a rocket need to be going to break free of Earth's gravity? How fast would it have to be going in order to completely leave the solar system? (For the second part of this problem, assume that the Sun is the only mass in the solar system and that the rocket is ...
  68. Physics

    How fast does a rocket need to be going to break free of Earth's gravity? How fast would it have to be going in order to completely leave the solar system? (For the second part of this problem, assume that the Sun is the only mass in the solar system and that the rocket is ...
  69. physics

    A student of weight 990 N was sent to another planet called Nerdland. If Nerdland has a mass that is three times the mass of the earth and a radius that is half the radius of the earth, what would be the mass in kg of the student when on Nerdland?
  70. physics

    A student of weight 600 N was sent to another planet called Nerdland. If Nerdland has a mass that is three times the mass of the earth and a radius that is half the radius of the earth, what would be the mass in kg of the student when on Nerdland?
  71. phsics

    A student of weight 830 N was sent to another planet called Nerdland. If Nerdland has a mass that is three times the mass of the earth and a radius that is half the radius of the earth, what would be the mass in kg of the student when on Nerdland?
  72. PHYSICS

    A student of weight 830 N was sent to another planet called Nerdland. If Nerdland has a mass that is three times the mass of the earth and a radius that is half the radius of the earth, what would be the mass in kg of the student when on Nerdland?
  73. science

    if you weigh 100 pounds on earth than how much would you weigh on each other planet in our solar system
  74. space

    the pull of gravity between earth and the sun acts across how many kilometers of space.
  75. Physics

    What is the centre of mass if the mass of the earth is 81 times that of the moon and the distance between them is 384 Mm=60 rj ?
  76. Chemistry(Please check)

    1)For an atom of carbon how many valence electrons are "s" electrons? 2 2) How many are "p" electrons? 4 3)How many (total) electrons in carbon are paired? 2 4) How many are unpaired? 1 Are these correct.
  77. Calculus

    Two forces act on an object at 20 degree to each other. One force has a magnitude of 200N, and the resultant has a magnitude of 340N. Determine the magnitude of the second force and the direction it makes with the resultant.
  78. math/calc

    The hypotenuse of a right triangle has one end at the origin and one end on the curve y+x^2e^(-3x), with x > or = 0. One of the other two sides is on the x-asis, the other side is parallel to the y-axis. Find the maximum area of such a triangle. At what x-value does it occur?
  79. math/calc

    The hypotenuse of a right triangle has one end at the origin and one end on the curve y+x^2e^(-3x), with x > or = 0. One of the other two sides is on the x-asis, the other side is parallel to the y-axis. Find the maximum area of such a triangle. At what x-value does it occur?
  80. science

    A rope is stretched between two boats at rest. A sailor in the first boat pulls the rope with a constant force of 100 N. First boat with the sailor has a mass of 250 kg whereas the mass of second boat is double of this mass. If the initial distance between the boats was 30 m, ...
  81. physics

    Four ropes are tied to a stake, and each is pulled toward a compass direction, N, S, E, or W. A force of 10 lb is applied to the rope pulled toward the east. Forces of 20, 30, and 40 lb are applied toward the south, west, and north, respectively. What is the net force exerted ...
  82. Word problem

    earth and cement block filling a box weighs 390mlb.the block weigh 2.4times as much as water and earth weighs 1.5times as much as water.water filling the box weighs 2000lb.find the weigh of the cement block.bl? plz help help help!!!! Show work
  83. physics

    Evaluate the following statement (T/F/N), explain: If you reduce by half the distance between two point charges, you double the magnitude of electrical force that each exerts on the other.
  84. Science

    In the Earth Science Reference Tables (you can find them at google), on pg 11 on the bottom where there's the Earthquake Travel Time Graph, on the y-axis, what does each box equal? like for the x-axis, each box between 1 and 2, and 2 and 3 is 200 km, what what about the boxes ...
  85. physics

    An apple weighs 2 KG. The earth exerts a force of 20 Newtons on the apple. How fast does the apple fall ? ( 1 Newton = kg/m/s2)
  86. physics

    The De-orbit Burn The Shuttle must reduce its velocity at a pre-calculated point in its orbit in order to return to Earth. In order to reduce the velocity and change the orbit of the Shuttle, a maneuver called the de-orbit burn is performed. For this maneuver, the Shuttle is ...
  87. physics

    Two vehicles with the same mass collide and lock together traveling 28 m/s at 37 degrees north of east after the collision. How fast was the car traveling that was heading north while the other vehicle was traveling east?
  88. physics

    Two vehicles with the same mass collide and lock together traveling 28 m/s at 37 degrees north of east after the collision. How fast was the car traveling that was heading north while the other vehicle was traveling east?
  89. physics

    A river flows due east at 1.50 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 9.2 m/s due north relative to the water. (a) What is the velocity of the boat as viewed by an observer on the shore? m/s at ° east of ...
  90. Science

    Can someone help me/check with this work? 1. _______ is the rate of change of position. A.Speed***** B.Velocity C.Acceleration D.Deceleration 2. Which of the following is the difference between speed and velocity? A. direction***** B.units C.speed D.none of the above 3.A ...
  91. U. Physics

    Two loudspeakers are placed 3.00m apart. They emit 485 Hz sounds, in phase. A microphone is placed 3.20m distant from a point midway between the two speakers, where an intensity maximum is recorded. How far must the microphone be moved to the right to find the first intensity ...
  92. Social Studies (MAPS)

    grid north is west of true north by 0 degrees, 57 minutes, which is equal to 17 mils. (There are 6,400 mils in a circle.) Magnetic north is east of true north by 8 degrees, which is equal to 142 mils. *B. What is the difference (in degrees and minutes) between true north (star...
  93. physics

    An astronaut in full gear has a weight of 2900 N on Earth. Jupiter; weight on planet relative to earth is 2.53 and weight of a 150-lb person is 380. How much will the astronaut weigh on the Jupiter? W_{Jupiter} =________________ N Neptune; weight on planet relative to earth is...
  94. math

    How high is a treethat cast a 26-ft shadow at the same time a 4-ft pole cast a shadow which is 7-ft long? The hieght of the tree is____ ft. I believe that this answer is 23-ft tall is that correct?
  95. math

    A cable 20 feet long connects the top of a flagpole to apoint on the ground that is 16 feet from the base of the pole.how tall is the flagpole? (A) 26ft (B) 10ft (C)12ft (D)8ft..
  96. physics help

    The distance between the midponts of two metal balls.P and Q,respectively of masses 55 kg and 70 kg is 80 cm calculate the gravitational force that P exerts on Q7 (b)give only the magnitude of the force that Q exerts on P (c)if Q Is now replaced by a ball that 1/2 its original...
  97. probability

    Consider a deck of 52 cards with the following characteristics: 13 red cards, numbered 1 through 13 13 blue cards, numbered 1 through 13 13 green cards, numbered 1 through 13 13 black cards, numbered 1 through 13 1. Describe the steps necessary to calculate the theoretical ...
  98. Probability

    Consider a deck of 52 cards with the following characteristics: 13 red cards, numbered 1 through 13 13 blue cards, numbered 1 through 13 13 green cards, numbered 1 through 13 13 black cards, numbered 1 through 13 1. Describe the steps necessary to calculate the theoretical ...
  99. spanish

    where can i find the short story: What ought a man to do on earth.
  100. 8th grade earth science

    how to find the longitude of meridians
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