1. physics

    Two artificial satellites, 1 and 2, orbit the Earth in circular orbits having radii R1 and R2. If R2=2R1, the accelerations a2 and a1 of the satellites are related how?
  2. physics

    How long would our year be if our Sun were two fifths its present mass and the radius of the Earth’s orbit were six times its present value?
  3. Statistics

    The national centre of health statistics reports that the mean systolic blood pressure for males 35-44 years of age is 128 and a standard deviation of 15. A group of 50 executives selected at random are tested and found to have an avarage of 132.3. Is
  4. Chemistry

    Which of the following processes are spontaneous? (Select all that apply.) a. average car prices increasing b. a soft-boiled egg becoming raw c. a satellite falling to Earth d. water decomposing to H2 and O2 at 298 K and 1 atm I thought it would c and
  5. physics

    Suppose a spherical planet P has a uniform density of 4.96*10^3 kg/m^3 and a radius R=1904 km. For a parcel that weighs 73 N on the surface of the (spherical) earth, what is A) gp/ge and B) its weight on the surface of P? Using the "tunnel mail" system
  6. physics

    Calculate the period of a satellite orbiting the Moon, 95 km above the Moon’s surface. Ignore effects of the Earth. The radius of the Moon is 1740 km.
  7. physics

    When an electron jumps from the 4th orbit to the 2nd orbit which series line does it get?
  8. chemistry

    1)why bohr orbit are called stationary orbit? 2)what do you mean by saying energy of electron is quantised?
  9. chemistry

    1)why bohr orbit are called stationary orbit? 2)what do you mean by saying energy of electron is quantised?
  10. Physics

    Two manned satellites approaching one another at a relative speed of 0.200 m/s intend to dock. The first has a mass of 2.00 multiplied by 103 kg, and the second a mass of 7.50 multiplied by 103 kg. If the two satellites collide elastically rather than
  11. Physics

    A 6 kg rock is suspended by a massless string from one end of a 6m measuring stick. What is the mass of the measuring stick if it is balanced by a support force at the 1m mark? answer in units of kg. Thanks for any help Rather than just posting the
  12. Science

    We determine the structure of the Earth's core using ? deep mine shafts. satellite imaging. radar and sonar. seismic wave data. magnetic resonance imaging.
  13. geology

    We determine the structure of the Earth's core using: a)deep mine shafts b)satellite imaging c)radar and sonar d)seismic wave data e)magnetic resonance imaging
  14. help help help

    The asteroid belt between Mars and Jupiter consists of many fragments (which some space scientists think came from a planet that once orbited the Sun but was destroyed). (a) If the center of mass of the asteroid belt is about 2 times farther from the Sun
  15. biomechanics

    calculate the following body segment parameters for the thigh of a subject with a height of 180cm and mass of 72kg a) segment mass b) segment length c) centre of mass position relative to proximal end d) radius of gyration about proximal end e) Moment of
  16. 3rd grade - Solor System

    How many years does it take Jupiter to orbit the sun? One year on the this planet would actually be how many earth years long?
  17. math question

    Problem Find an approximate value for the rate at which the moon orbits the earth. Assume that the moon’s orbit is circular.
  18. physics please help

    What is the angular momentum of the Moon in its orbit around Earth in kg m2/s? I do not have any information about the moon, so I looked it up, but I got the question wrong so I don't know what values I should be using...I got 5.7 * 10^35. Thank you!
  19. science

    A beam 6 m long is simply supported at the ends,and carries a uniform distributed load of 1500kg/m (including its own weight ) and three concentrated loads of 1000,2000 and 3000 kg acting respectively at the left quarter point,centre point and right
  20. physics

    A beam 6 m long is simply supported at the ends,and carries a uniform distributed load of 1500kg/m (including its own weight ) and three concentrated loads of 1000,2000 and 3000 kg acting respectively at the left quarter point,centre point and right
  21. Physics

    Two manned satellites approaching one another at a relative speed of 0.200 m/s intend to dock. The first has a mass of 4.50 multiplied by 103 kg, and the second a mass of 7.50 multiplied by 103 kg. Assume that the positive direction is directed from the
  22. French =)

    Please could you check my French homework for mistakes? The first part is a presentation and the second part is my half of a role play. Also do you know of any websites that can help you with pronunciation? Hugh Heffner Mesdames et messieurs, je vous
  23. maths

    Pls help me with this... Helen had $140 more than Tom. Tom spent as much as Helen at a shopping centre. How much did Tom have at first if he spent 0.8 of his money while Helen spent 2/3 of hers?
  24. Physics

    The mass of a satellite is 2 Kg. Assuming that the mass is evenly distributed throughout the satellite, calculate the moments of inertia about the X, Y and Z axes.
  25. English

    I urgently need you to check these sentences. 1) Tourists spend their holiday in bed and breakfasts and go to restaurants. 2) I like the countryside because the air is cleaner and the atmosphere is quieter.There is always something to do, like going for a
  26. math - 8th grade

    I have a table to complete.Given that points A and B belong to a circle with centre O; If the area of the sector bounded by central angle AOB is 14.13cm squared and the measure of central angle AOB=45cm squared. What is the radius of the disk(cm)and what
  27. French

    Can someone please check my work? Read what the following people are doing and then explain why, using "avoir" and one of the expressions in the list. faim soif chaud froid model: Alice mange une pizza. (Elle a faim.) 1. Je mets mon pull. (J'ai froid.) 2.
  28. Astronomy

    Calculate the approximate circumference of Earths orbit around sun, assuming that orbit is a circle with radius of 1.5 X 10 to the eighth.
  29. Math

    The path of a basketball foul shot is modelled by the relation h=-0.44d*2+4.4d+7, where h is the height in feet and d is the horizontal distance in feet. At what height is the ball released? What was the maximum height the ball reached? The centre of the
  30. maths

    A town planner is using a map of a town centre with a scale of 1: 1250 A path in the town is 8cm long on the map. How long is the path in the town? Give your answers in metres. how do i work this out?? set up the proportion: 1/1250 = 8/x x=1250*8 cm =
  31. Physics

    At the heighest point on earth, the distance to the center of the earth is approximately equal to 1.0014 times the radius of the earth. What would be in N/kg the magnitude of the gravitational field (g) due to the earth at that position? Assume 9.8 N/kg
  32. Math

    show that graphs of (x-2x)/(x+2y)=1/3 and (x-y)/(x+y)=3/5 coincide...how do you solve it?
  33. Math

    show that graphs of x-2x/x+2y=1/3 and x-y/x+y=3/5 coincide...how do you solve it?
  34. Earth physics I think

    Keplerian motion/Analemma Does the earth actually alter speed or is it a result of the earth being closer to the sun at some points in its eliptical orbit or BOTH? Additionally does anyone know where the value of the earth/sun analemma can be found. I read
  35. physics - HELP

    A 62.9 kg spacewalking astronaut pushes off a 697.0 kg satellite, exerting a 117.0 N force for the 0.977 s it takes him to straighten his arms. How far apart are the astronaut and the satellite after 3.57 min?
  36. physics

    A 62.9 kg spacewalking astronaut pushes off a 697.0 kg satellite, exerting a 117.0 N force for the 0.977 s it takes him to straighten his arms. How far apart are the astronaut and the satellite after 3.57 min?
  37. physics

    A 62.9 kg spacewalking astronaut pushes off a 697.0 kg satellite, exerting a 117.0 N force for the 0.977 s it takes him to straighten his arms. How far apart are the astronaut and the satellite after 3.57 min?
  38. Maths

    An item of jewellery consists of two identical pyramids, PABCD and QABCD, joined at their common rectangular base. AB = 8mm, BC = 12mm and PQ = 30mm. The line pq passes through the centre of the rectangle ABCD. Calculate the area of triangle ABP Calculate
  39. physorbit

    A spacecraft is in orbit around a planet. The radius of the orbit is 3.2 times the radius of the planet (which is R = 71490 km). The gravitational field at the surface of the planet is 24 N/kg. What is the period of the spacecraft's orbit?
  40. physic

    4. The physics class is having a tug of war – the men against the women. For a long time the two teams are pulling with equal force and the knot in the centre of the rope isn’t going anywhere. But then one boy sneezes and stops pulling as hard for just
  41. Math show work

    If a hypothetical planet in our Solar System had a sidereal period of 11.1 Earth years and a circular orbit, how far from the Sun in Astronomical Units would it be? Enter your answer to the nearest 0.01 AU.
  42. Physics

    9.) A 1 570 kg satellite orbits a planet in a circle of radius 5.94 x 106 m. Relative to zero at infinity the gravitational potential energy of this satellite is -9.32 x 1011 J. What is the mass of the planet?
  43. science help pls pls

    A star is observed from two positions of Earth in its orbit, in summer and winter. Which of these is the best method to calculate the approximate distance of the star from Earth? measure the parallax and use it in calculations measure the red shift of
  44. math!!!

    Molten plastic is injected into the centre of a circular mold of constant height, H, through a small hole. The rate of injection is such that the radius of the plastic inside the mould increases so that r(t)= 3t^2 -2t^3 where the mold has maximum radius of
  45. Physics

    Kate (m = 50 kg) is swinging on a tire tied by a (light) rope (L = 3 m) to a tree limb. Her twin Ashley comes along and squeezes into the tire with her. Assume that at all times the centre of mass of the person(s) riding the tire is at the end of the rope.
  46. Math

    The pedals of a bicycle are mounted on a bracket whose centre is 29.0 cm above the ground. Each pedal is 16.5 the bracket The bicycle is pedalled at the rate of 12 cycles per minute. a) Write an equation for the height of one pedal at time t, in seconds,
  47. Astronomy

    The average distance between the Earth and the Sun is called the astronomical unit (AU), which is about 150 million km (1.5 x 108 km). Jupiter is 780 million km from the sun. a) How far is Jupiter from the sun in astronomical units (AU)? b) Based on your
  48. algebra

    A satellite dish has a parabolic cross section and is 6 ft deep. The focus is 4 ft from the vertex. Find the width of the satellite dish at the opening. Round your answer to the nearest foot. Thank you
  49. general physics

    His spacecraft, Vostok I, was a sphere about 2.3 m in diameter, and it reached a maximum altitude above Earth’s surface of 327 km. What was the spacecraft’s speed at this point in its orbit?
  50. physics

    A mass m1 = 6.0 kg sits on a frictionless table, and rotates at a constant speed v = 3.0 m/sin a circle of radius R = 1.5 m. m1 is attached by a massless string which passes through a hole in the centre of the table to a second m2 (which hangs freely
  51. Engineering

    ANPR system takes two images of each passing car. each image is 840 pixels wide and 320 pixels high. each pixel is stored in one byte. on average six car pass per minute. if each uncompressed image is sent back to the control centre for processing, what is
  52. 8th grade

    draw a diagram showing the motion of a satellite around Earth. Draw the force vectors acting on the sattelite. Is the sattelite accelerating?
  53. Physics

    A girl standing on a stationary uniform plank 10m long. The plank can move with negligible friction along the surface of the water. A) the girl walks along the plank with a velocity of 2ms-1 relative to the plank until she reaches the end of the plank. The
  54. Physics

    A satellite with a mass of 284 kg approaches a large planet at a speed vi,1 = 14.4 km/s. The planet is moving at a speed vi,2 = 11.0 km/s in the opposite direction. The satellite partially orbits the planet and then moves away from the planet in a
  55. Physics

    Asteroid satellite: While on its way to Jupiter in 1993, the Galileo spacecraft made a flyby of asteroid Ida. Images captured (Fig. P5.66) of Ida discovered that the asteroid has a tiny moon of its own, since given the name Dactyl. Measurements found that
  56. trig problem

    Hi, A fountain in a shopping centre has a single jet of water. The height of the jet of water varies according to a sinusoidal function. A student notes that, in exactly one minute, the jet goes from a minimum height of 2m to a maximum height of 6m and
  57. Physics

    A spherical satellite has 12 identical monopropellant thrust chambers for attitude control with the following performance characteristics: thrust (each unit): 5 lbf; Is (steady state or more than 2 sec): 240 sec; Is (pulsing duration 20 msec): 150 sec; Is
  58. space

    What is the force of gravity at 220 miles above Earth's surface? Calculate how much of a g force the astronauts are actually experiencing. The solution for this math problem is a percentage. You can calculate it using the Algebraic equation: gr = R2/r2 x g
  59. Science

    A cricket bowler bowls a cricket ball witha mass of 150g and a radius of 52mm. The bowler's arm weighs 3.4kg and has a length of 0.68m. The centre of mass of the bowler's arm act's at it's midpoint. The moment of inertia of the cricket ball and bowler's
  60. PHYSICS

    A cricket bowler bowls a cricket ball witha mass of 150g and a radius of 52mm. The bowler's arm weighs 3.4kg and has a length of 0.68m. The centre of mass of the bowler's arm act's at it's midpoint. What is the moment of inertia of the cricket ball and
  61. physics

    Two people, George who has a mass of 93.0 kg and Victoria who has a mass of 60.0 kg, are on a frozen circular pond. They stand at the very centre and push off of each other. The distance from one side of the pond to the other is 83.0 m and it takes George
  62. Math Gr12 Advanced Functions

    I am stuck on this one part of this question: The function S(d)=93(logd)+65 relates the speed of the wind S, in miles per hours, near the centre of a tornado to the distance that the tornado travels,d,in miles. If a tornado has sustained winds of about 250
  63. Math

    From two tracking stations, A and B, 450km apart, a satellite is sighted at C directly above the line joining A to B. At the moment of sighting, angle A is 39 and angle B is 45. Find the height of the satellite. Please show all your steps clearly and asap,
  64. maths

    A villager Itwaari has a plot of land of the shape of a quadrilateral. The Gram Panchayat of the village decided to take over some portion of his plot from one of the corners to construct a Health Centre. Itwaari agrees to the above proposal with the
  65. physics

    A small stone of mass m is stuck on the periphery of a wheel of radius R rolling along the x-axis with a constant speed v. The centre of the wheel was at x = 0 at time t = 0, and stone was on the ground at that time. Find the angular momentum of the stone
  66. physiscs

    in a simple model of a hydrogen atom, the electron revolves in circular orbit around the proton with a speed of 1.1*10^6m/s. determine the radius of the electrons orbit
  67. physics

    Two identical small spheres of mass 2.0g are fastened to the ends of an insulating thread of length 0.60m The spheres are suspended by a hook in the ceiling from the centre of the thread. The spheres are given identical electric charges and hang in static
  68. Application prob. for Trig.

    Hi, A fountain in a shopping centre has a single jet of water. The height of the jet of water varies according to a sinusoidal function. A student notes that, in exactly one minute, the jet goes from a minimum height of 2m to a maximum height of 6m and
  69. physics

    a square with side length 2.0 cm has a charge of -1.0x10^-6C at every corner. What is the magnitude and direction of the electric force on each charge? What is the force on a fifth charge placed in the centre of this square? Does the sign of the fifth
  70. Physics

    A 59.6 g box is left 17.5 cm from the centre of a merry-go-round. If the box has coefficients of friction of μs = 0.790 and μk = 0.550 with the merry-go-round, what is the maximum speed of the merry-go-round without having the box slide off of
  71. Physics

    A 51.6 g box is left 17.8 cm from the centre of a merry-go-round. If the box has coefficients of friction of μs = 0.790 and μk = 0.480 with the merry-go-round, what is the maximum speed of the merry-go-round without having the box slide off of
  72. Geometry

    A circle of radius 1 is drawn in the plane. Four non-overlapping circles each of radius 1, are drawn (externally) tangential to the original circle. An angle ã is chosen uniformly at random in the interval [0,2ð). The probability that a half ray drawn
  73. math

    1. two circles. x^2+y^2-16x-8y+35=0 and x^2+y^2=5 are given. a. write the equations in the standard form. b.prove that the circles touch each other. c.hence calculate the equation of their common tangent 2. find the equation of a. circle. with centre
  74. Physics 30

    A point charge q=+4.7nC is placed at each corner of an equilateral triangle with sides of 0.21m in length. a) What is the magnitude of the electric field at the midpoint of the three side of the triangle? b) Is the magnitude of the electric field at the
  75. Mathamatics

    A conference centre charges £120 to hire a room, with an additional charge of £8 for each delegate. (a) Find the total cost (including room hire) of a conference with 30 delegates. (b) Write down a formula for the total cost, C,in £,ofhiring a room for
  76. physics

    4. The physics class is having a tug of war – the men against the women. For a long time the two teams are pulling with equal force and the knot in the centre of the rope isn’t going anywhere. But then one boy sneezes and stops pulling as hard for just
  77. math

    A town planner is using a map of a town centre with a scale of 1: 1250 A new section of road will be 180 cm. How long will it be on the map? Give your answers in centimetres. how do i work this ouit? Please check your figures and the wording of your
  78. maths --plse help me..

    A villager Itwaari has a plot of land of the shape of a quadrilateral. The Gram Panchayat of the village decided to take over some portion of his plot from one of the corners to construct a Health Centre. Itwaari agrees to the above proposal with the
  79. math

    the vertices are at (2,1) and (2,7) and focus is at (2,*) write the equation of the hyperbola that meets each set of conditions. Is the asterisk supposed to be an 8? It has to be some number. I will set this up for you later of you respond. The fomulas you
  80. physics....

    1) Thin films, such as soap bubbles or gasoline on water, often have a multi-coloured appearance that sometimes changes while you are watching. Explain the multi-coloured appearance of these films and why their appearance changes with time. 2) Yellow light
  81. maths --plse help me..

    A villager Itwaari has a plot of land of the shape of a quadrilateral. The Gram Panchayat of the village decided to take over some portion of his plot from one of the corners to construct a Health Centre. Itwaari agrees to the above proposal with the
  82. automobile engineering

    For an automobile with wheel base 2.5m, the centre of gravity lies 0.6 m above the ground and 1.15 m in front of the rear axle. The automobile is moving on level ground with a speed of 45 km/hr. Find the minimum stopping distance when (a) Only rear wheels
  83. maths

    A rope AB attached to a small block of neglible dimensions and passes over apulley C so that its free end hangs 1.5 metres above ground. When block rests on the floor. The end A of the rope is moved horizontally in astraight line by a man walking at a
  84. Science

    The time period of simple pendulum in earth surface is T. then time period in satellite is
  85. Physics 1 - Mechanics

    You are making a trip in a space shuttle, and your friend Jimmy is in another space shuttle. He shares the same circular orbit with you, which is 420 km above the Earth, but he is 21 km ahead of you. (a) How long will it take you to catch up with your
  86. phy

    A wheel rotates about an axis passinG through the centre and perpendicular to the plane with slowly increasinG angular speed.thus it has? A. Radial velocity and radial acceleration B. Tangential velocity and radial acceleration C. Tangential velocity and
  87. SraJMcGin: French

    I've corrected my work. I think I got everything. About the Hugh Heffner presentation, the bit about the A levels. I wanted to say that he now has ten A*s at GCSE level and 4 As at A level. Those are the exams you have to take in England, though I suppose
  88. Physics

    In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the
  89. Physics

    In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the
  90. Physics

    A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal
  91. Physics

    A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal
  92. Physics

    A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal
  93. Science

    I know what a baseline is, but what baseline is used in astronomy? y do we need vary the length of baselines we use? Is the baseline the diameter of the earth's orbit? I really do not get the 2nd part.
  94. Physics

    This is what I have to do. I dont get it, I've tried and tried. Contacted my teacher and still dont get it. Please help. I'm frustrated. The projectile’s mass is not needed.  The projectile must be launched on the horizontal plane.  The
  95. Physics

    You have probably seen films of astronauts floating weightless in orbiting satellites. People often get the idea that the astronauts are weightless because they are so far from the gravity of the earth. Let us see if that explanation is correct. Typically,
  96. physics

    You have probably seen films of astronauts floating weightless in orbiting satellites. People often get the idea that the astronauts are weightless because they are so far from the gravity of the earth. Let us see if that explanation is correct. Typically,
  97. Science

    ....Unit 2 Which type of eclipse would you expect to see if the moon passes directly between Earth and the Sun A. A solar Eclipse B. a lunar eclipse C. a total lunar eclipse D. a penumbra Which of the following happens during a lunar eclipse? A.a lunar
  98. French

    Can you make sure these are right, and some of them i just don't know XD l'écu - shield la couronne - cap Les supports - supports devises - No idea @_@ le cimier et le tortil - crest and ? le casque et les mantelets - helmet and short cape la terrasse -
  99. physics

    A geostationary satellite for communications seems to be in a fixed spot above the equator because it has the same angular velocity as the earth.A) show that if it goes round once a day,its angular velocity is a little over 7×10 race to negative 5 rad
  100. precal

    The Singapore Flyer, currently the world's largest Ferris wheel, completes one rotation every 37 minutes. Measuring 150m in diameter, the Flyer is set atop a terminal building, with a total height of 165 m from the ground to the top of the wheel. When