Posts by s

Total # Posts: 560

  1. math

    oh ok thank you very much
  2. math

    Oh alright so i got 1.601 *10^9 or do i round it if it is like that ? 1.6 * 10^9
  3. math

    when it wants me to multiply 800.5 times the expression. like how would i do that?
  4. math

    determine the product 800.5*(2*10^6)
  5. math

    ohh okay now i get it, thank you
  6. math

    thanks for helping i guess.
  7. math

    Ms. sue i don't know anything its a new unit for me.
  8. math

    a lab has two bacteria cultures. culture a contains 8*10^4 bacteria, and culture B contains 4*10^6 bacteria. how do the two cultures compare in size?
  9. msth

    oh yeah i should of thought of that then i understand it better now though, i will try your way more
  10. msth

    the part im stuck at is part B to the question: how many times greater is the mass of earth than the mass of the moon, express your answer in scientific notation
  11. msth

    oh its because at my school they taught us a complicated way to solve it and its really confusing but i did get 6.04 * 10^23 so i was off by one
  12. msth

    but then i did it again and got a different answer after checking it i think its correct
  13. msth

    i got 1.5 *10^5 the first time i just tried it and the second time i did it a different way and got 3.75 *10^6
  14. msth

    thank you !
  15. msth

    the mass of earth is 5.97*10^24 kilograms the mass of the moon is 7.34 *^22 kilograms what is the combines mass of earth ad the moon. express your answer in scientific notation
  16. math

    NEED HELP the combines volume of all the tanks at an aquarium is 1.25*10^6 gallons. the aquarium plans to install a new dolphin tank with a volume of 250,000 gallons. what will be the total volume of all the tanks at the aquarium after the new dolphin tank is installed?
  17. Chemistry

    Can you please show the working out for e?
  18. Chemistry

    A calorimeter, with calorimeter constant 7.31 J K–1, was used to measure the heat of reaction for mixing 100.0 mL of 0.100 M Ag+ with 100.0 mL of 0.100 M Cl–. The temperature change was +0.770 K for the 200.0 g of solution (specific heat capacity = 4.35 J K–1g&#...
  19. Chemistry

    At 20.0°C the vapour pressure of pure methanol is 11.8 kPa and that of pure ethanol is 5.93 kPa. A gaseous mixture of methanol and ethanol is cooled and compressed until the first drops of liquid form at 20.0°C and a total pressure of 10.0 kPa. Assuming the liquid ...
  20. chemistry

    Air consists of 21 % oxygen, 78 % nitrogen and 1 % argon by volume. Calculate: * (a)  the partial pressures in Pa, if total pressure is 1 atm, ? * (b)  the concentration in mol m–3, of each gas at 273 K, ? * (c)  the average molar mass of air, ? * (d)  ...
  21. Chemistry

    High quality coal (anthracite) is almost pure carbon. The combustion of carbon to carbon dioxide releases 393 kJ per mol of carbon burnt. If 1.000 kg of anthracite is burnt: (i) How much heat is released? (ii) How much ice (in kg) at 273 K could be melted to give water at 273 ...
  22. CS/Programming

    Hi,I'm an absolute beginner in this field and this may be a dumb idea.But as mind came up with this,I simply doesn't feel like neelcting the idea asking for some advice.So here it is. If I want my phone to play a song when it's fully charged, can I use Python for ...
  23. Maths

    A sum of rs400 amounts to rs480 in 4years. What will it amount to if the rate of interest is increased by 2% p.a
  24. Physics

    In an 8.00 km race, one runner runs at a steady 12.0 km/h and another runs at 14.6 km/h
  25. Physics

    Excellent human jumpers can leap straight up to a height of 100 cm off the ground. To reach this height, with what speed would a person need to leave the ground?
  26. Physics

    In a 5.00 km race, one runner runs at a steady 11.3 km/h and another runs at 14.9 km/h . How long does the faster runner have to wait at the finish line to see the slower runner cross?
  27. Physics

    A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 58.8 m/s2 . The acceleration period lasts for time 5.00 s until the fuel is exhausted. After that, the rocket is in free fall. Max height
  28. Physics

    A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 58.8 m/s2 . The acceleration period lasts for time 5.00 s until the fuel is exhausted. After that, the rocket is in free fall.
  29. Physics

    When striking, the pike, a predatory fish, can accelerate from rest to a speed of 3.6 m/s in 0.11 s . Distance?
  30. Physical Chemistry

    15.The Rydberg constant for the Be3+ ion is 109731 cm–1. Calculate the ionization energy of a ground-state Be3+ ion. 22.How many electrons can occupy the following subshells: (a) 2s, (b) 4d, (c) 6f, (d) 6g, (e) 6h?
  31. Math

    on a map 1/2 inch represents 50 miles. How long would a line need to be to represent 750 miles. so I thought I should divide 750 by 50 than multiply 15 { the answer I got } by 1/2 but I have a feeling its wrong
  32. English

    Yes it’s right
  33. English Writing

    Thank you so much
  34. English Writing

    I'm not a native speaker. Can you please teach me? Is this sounds weird? I was worrying to stay in English class. However, she made me feel comfortable and fun to stay her class through every class.
  35. MATH

    During halftime of a football?game, a sling shot launches? T-shirts at the crowd. A? T-shirt is launched from a height of 33 feet with an initial upward velocity of 64 feet per second. The? T-shirt is caught 48 feet above the field. How long will it take the? T-shirt to reach ...
  36. Nait

    pythagorean theorem!! x^2 (leg 1) + y^2 (leg 2) = z^2 (hypotenuse = the ladder) x^2 = (12)^2 - (8)^2 x^2 = 80 x = sq root (80) ~ 8.944
  37. Math

    If u scored 85,89,89,91 on a test but u need an average mean of 90 what will u have to score on ur last test to get 90?
  38. Physics

    A horizontal forces of magnitude 500N pulls two blocks of masses m1=10 kg and m2=20 kg which are connected by the light inextensible string and lying on the horizontal frictionless surface. Find the tension in the strings and acceleration of each mass when forces is applied on...
  39. US HISTORY

    Who attacked first on the Battle of Little Bighorn??? The natives or the army?
  40. Geology

    ss
  41. Culture

    As an ABC (Australian Born Chinese), Who is an avid watcher of korean entertainment ( dramas, variety, movies etc), listener of k-pop, watch anime from japan, listen to j-pop, watch chinese tv shows and movies. Having studied German , French . It perplexes me that to this day...
  42. science

    0m/s^2
  43. stats

    working on the same two questions tonight!
  44. Math

    A room is 8 meter long and 6 meter wide.if floor is paved of square tiles then what should be the maximum size of the tile?sole it
  45. Algebra

    Hugh earns $33.33. I am assuming 'they' refers to Leslie and JOhn together.... Set it up like this: 3+H=J 2H-2=L J+L=100 Substitute the first two equations into the third one, and solve for H, and you got it!
  46. Physics

    So average acceleration is just the 'slope' of the velocity vs time graph.. The equation would be (Vf - V0)/t = average acceleration... (12.2-3.7)/7.99 = 1.06 m/s^2 because the units are (m/s)/s
  47. AP physics

    Since there is air resistance that affects the experimental value for g, it is hard to find that out. If there is an inclined plane that has very little friction, then all that is needed is the angle of the plane with respect to the ground, and the value would be accurate..
  48. Social Studies

    The only ones that make any sense are A and C, but I believe the answer is A..
  49. math

    A sum of money Lent at simple interest amount to
  50. Calc

    find the equation of the line that is tangent to the curve 𝙛(𝑥)= 5 +3x² -x⁵ at the point (1,7)
  51. Chemistry

    Static charge can interfere with the production of plastic products by attracting dust and dirt. to reduce it, manufacturers expose the area to polonium-210, which has a half-life of 138 days. How much of a 25.0-g sample will remain after one year (365 days)? N = N0(1/2)t/T...
  52. chemistry

    Write the oxidation and reduction half-reactions for a silver-chromium voltaic cell. Identify the anode, cathode, and the direction of electron flow. Ag+ + e-  Ag Cr  Cr2+ + 2e- or Cr  Cr3+ + 3e- ????? Which is the correct equation for the chromium side...
  53. Physics

    tf
  54. Spanish

    nu
  55. Stat

    I typed the question correctly maybe my homework has a typo...
  56. Stat

    Mean of 10 observations is 100. One of the observations is dropped from the data. The mean of the remaining observations is 9. What is the value of the dropped observation?
  57. Math

    Answers please. Please
  58. chemistry

    the solubility of CaF in water is 7*10^-2 gm/l. find its solubility in 0.5m CaCl2 soln
  59. Pre calc

    Give an example of an exponential function that has a range (3,infinity)
  60. Physics

    a box of mass 7 kg is pulled up a frictionless 30 degree incline by a force of 381 N which acts parallel to the incline surface. the box has an initial speed of 5m/s and is pulled 9m. what is the speed of the box at the end of the 9m.
  61. Physics

    a mass, m = 2.1 kg, is ejected horizontally from a compressed coil with a force constant, k = 5.2 N/m and compression, x = 25 cm, onto a rough ramp that is 1.5 cm long with one end raised to a height, h= 120 cm. the speed at the bottom of the rough ramp is v=+3.037 m/s. the ...
  62. Physics

    998114 N
  63. Physics

    old faithful geyser in yellowstone park shoots water hourly to a height of 44.8m. with what velocity does the water move when it is at 24.4m above the ground (on its way up)?
  64. Physics

    so is it 196 or 191J?
  65. Physics

    a block of mass 2kg moves on a frictionless inline (none of the forces on the block are shown). its initial velocity is v initial=3m/s, and it slides a vertical distance h=10m up the slope and its final velocity is v final=2m/s. find the external work done on the block.
  66. Physics

    so 14m/s?
  67. Physics

    a skier, mass 61 kg is at the top of a hill and starts down with an initial speed of 5m/s. he does no work on the way down, assume that the hill surface is frictionless. find his speed at the bottom of the hill which is 10m below the top.
  68. Physics

    determine the point of zero gravitation force, as measured from the centre of earth (mass 5.97 x 10^24 kg) to the sun ( mass 1.99 x 10^30 kg) if the earth-sun distance is 150 x 10^6 km.
  69. Physics

    a 1.2 kg magnet is capable of holding up a 0.5 kg mass. the magnet is placed on a vertical refrigerator door and given an initial push so that it slides up the door with an initial velocity of 0.11 m/s. if the coefficient of kinetic friction between the magnet and the door is ...
  70. Physics

    a 35 kg child slides down a 26 degree incline. the coefficient of kinetic friction is 0.33. what is her speed after sliding for 2.5 seconds starting from rest?
  71. Physics

    help pls
  72. Physics

    answers can be: 27.4, 13.2, 14.2, 11.42, 0.5 (all are N)
  73. Physics

    A 2kg mass, m1 and a 10 kg mass, m2 are in contact on a horizontal frictionless surface. a constant horizontal force 13.7 N in the positive X direction is applied to m1 and a constant horizontal force 10.7 N in the negative X direction is applied to m2. the masses stay in ...
  74. Physics

    a 61.6 kg person on a diet stand on a bathroom scale in an elevator. to their great pleasure the scale reads 46.8 kg. what is the acceleration of the elevator? (up is positive)
  75. Physics

    A 2 635-kg sailboat experiences an eastward force of 2 710 N by the ocean tide and a wind force against its sails with magnitude of 5 748 N directed toward the northwest (45° N of W). What is the direction of the resultant acceleration?
  76. Physics

    a stone is thrown at an angle of 30 degrees above the horizontal from the top edge of a cliff with an initial speed of 12m/s. a stop watch measures the stone's trajectory time from top of cliff to bottom to be 8s. how far out from the cliff's edge does the stone travel...
  77. Physics

    an airplane has a velocity of 499 km/h relative to the moving air. at the same time, a wind blows northward with a speed of 87 km/h relative to the earth. the airplane is moving in an easterly direction relative to the earth. find speed of airplane to relative to earth.
  78. Physics

    A tennis player strikes a ball when it is 2.20m above the ground, with a velocity 18.7 m/s at 20 degrees above the horizontal. The net is 5m away horizontally and it is 0.90m high. after 0.37 seconds, what is the direction of the ball with respect to the horizontal?
  79. Physics

    the distance of a planet from its sun is 19000000 miles. if there are 29400000 seconds in one orbit, find the speed of the planet in its orbit about the sun. (assume a circular orbit)
  80. Biology

    Which of the following is true for the nucleus? A) It has no definite structure B) It is surrounded by membrane C) It is the eukaryotic cell's energy-producing organelle D) It is closely associated with the Golgi apparatus. E) It is always bluish purple in colour
  81. math

    6.93 kg
  82. statistics help

    Nevermind, thanks for the help!
  83. statistics help

    What is SEm??
  84. statistics help

    Tests on a Chevy Cobalt incdicate a population mean of 32 mpg and a population standard deviation of 3.5 mpg. You take an SRS (sample random sample) of 10 cars to get a sample mean. What is the probability that your sample mean is greater than 34 mpg? I am not sure how to go ...
  85. Chemistry

    3. Choose the hybridization schemes for the following species. (a) AsBr6− sp sp2 sp3 sp3d sp3d2 (b) CSe2 sp sp2 sp3 sp3d sp3d2 (c) PbCl4 sp sp2 sp3 sp3d sp3d2 (d) SeO32− sp sp3 sp2 sp3d sp3d2 (e) BiF5 sp sp2 sp3 sp3d sp3d2
  86. Chemistry

    2. Which of the following molecules is/are trigonal pyramidal? N2O NH3 C2H2 SiF4 HN3 HCN SO3 H2S CF4 PF3 H2O BF3 COS O3 SO2 CS2 AsH3
  87. Chemistry

    1. [ PF4 ]+ (a) What is the electron-group geometry, according to VSEPR theory? (b) What is the molecular geometry? (c) Is this species polar or nonpolar?
  88. statistics help

    The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that AT LEAST 175 home are going to be used as investment property?
  89. statistics help??

    Someone flips a coin 50 times and gets 50 heads in a row. You suspect it is a 2 headed coin. Write the null and alternative hypotheses. Use the binomial theorem to get a p-value of getting exactly 50 hears in 50 trials.
  90. statistics

    A manufacturer claims that the mean lifetime of its lithium batteries is 1400 hours. A homeowner selects 25 of these batteries and finds the mean lifetime to be 1380 hours with a standard deviation of 80 hours. Test the manufacturers claim. Use alpha = 0.05. Round the test ...
  91. stat

    Construct a 90% confidence interval for the population mean. Assume the population has a normal distribution. A same of 15 randomly selected math majors has a grade point average of 2.86 with a standard deviation of 0.78. Round to the nearest hundredth. Answers: a) (2.41,3.42...
  92. statistics

    A university dean is interested in determining the proportion of students who receive some sort of financial aid. Rather than examine the records for all students, the dean randomly selects 200 students and finds that 118 of them are receiving financial aid. Use a 95% ...
  93. physics

    A 189.4 kg uniform, horizontal beam is hinged at one end and at the other is supported by a cable that is at 37 degrees to the vertical. The beam is 3.85 m long. Calculate the magnitude of the force at the hinge.
  94. math

    verify sin0/sin0+cos0=tan0/1+tan0
  95. algebra

    0 A bag contains 9 marbles: 3 are green, 4 are red, and 2 are blue. Heather chooses a marble at random, and without putting it back, chooses another one at random. What is the probability that both marbles she chooses are blue?
  96. Chemistry

    For a Sc atom in ground electronic state: 1. how many electrons are there in 4s orbitals? 2. how many electrons are there in 3d orbitals? 3. how many electrons are there in 4p orbitals? 4. how many unpaired electrons are there? 5. to what block does Sc belong to in the ...
  97. Chemistry

    Consider the 5p orbital of a hydrogen atom. 1. how many different 5p orbitals are there? 2. how many radial nodes are there? 3. how many angular nodes are there? (i.e. how many nodal planes or surfaces, not including radial nodes)
  98. Chemistry

    For each of the following experimental conditions determine whether molar mass would be: 1) too high, B) too low or C) unaffected. In each case, /explain/ how this result occurs a) after removing the flask from the water bath, the experimenter cools the flask to room ...
  99. Science

    For each of the following experimental conditions determine whether molar mass would be: 1) too high, B) too low or C) unaffected. In each case, explain how this result occurs a) after removing the flask from the water bath, the experimenter cools the flask to room temperature...
  100. Chemistry

    For each of the following experimental conditions determine whether molar mass would be: 1) too high, B) too low or C) unaffected. In each case, /explain/ how this result occurs a) after removing the flask from the water bath, the experimenter cools the flask to room ...
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