1. Science- Calorimetry
    Are the "q" solution and the "delta H" solution always equal?
  2. history
    Which option suggests the wide-ranging influence of the refugee Nazi scientists on US technology? A-these scientist proved themselves trustworthy by designing the atomic bomb, leading to the Saturn V rocket. B-These scientists developed the first working pro type of what would...
  3. Science
    A student measures the volume of a liquid and finds it to be 40ml. How many significant figures are in the measurement ? Really confused can someone help me out ?
  4. Life science
    Explain the scientific interpretation of the fossils found in the Cradle of humankind.
  5. science
    Which of the following questions is most testable through scientific experimentation? 1. Which gelatin takes longer to set: gelatin with fruit or gelatin without fruit? ***? 2. Which fruit looks more attractive in gelatin: bananas or apples? 3. Which tastes better: gelatin ...
  6. Science
    Which of the following is a valid reason to study science? A. All employers require an in-depth knowledge of science. B. Carrying out scientific experiments is a requirement of everyday life. C. Most colleges require advanced science classes. D. Understanding basic scientific ...
  7. Science
    0.02mole of the HCL and in 2leter of the pH solution
  8. science
    A slab of a thermal insulator is 100 cm² in cross section and 2 cm thick. Its thermal conductivity is 2.4 x 10-4 cal/s.cm.°C. If the temperature difference between the opposite faces is 100 degrees Celsius, how much heat flows through the slab in one day?
  9. Physical science
    The speed sound in air 330 m.s-1 Lightning flash is 1,5 km 1.calculate the time from the moment that you can see the lightning flash until you hear the thunder
  10. Science
    Why a study on environmental issues that cause Ill health a necessity
  11. Science
    A farmer wants to determine if a new fertilizer gives her a better crop yield than her old fertilizer. She spreads the old fertilizer in field A, which has a brand new irrigation system. She spreads the new fertilizer in field B, which has an irrigation system that will be ...
  12. science
    Which of the following best describes a scientific theory? A scientific theory is a rule of nature that can never be changed A scientific theory is an educated guess about the possible results of an experiment A scientific theory is description of a pattern of observations ...
  13. Science
    A mark on the rim of a rotating circular wheel of 0.50m radius is moving with a speed of 10s^-1a.find the angular speed
  14. Maths; science; agriculture; life science
    Inhumane farming wethods
  15. science
    can a food chain have a quaternary consumer without having secondary or tertiary consumer
  16. science
    Layers of shell or coral sand and mud form limestone
  17. Science
    How much carbon dioxide is produced on heating of 1kg of carbon
  18. Science
    How many grams of h2so4 are needed to neutralize completely 10 litre of ammonia gas at ntp
  19. Science
    Two balls of equal masses roll with velocities v and 4v,respectively .What is the ratio of their Kinetic Energies?
  20. english
    can you help me with passive voice misuse, and punctuation in compound and complex sentences. I was using a grammar checker website and it told me what was wrong. Mathematics resolves abstract problem situations of daily life, strengthens the mental calculation, having as the ...
  21. science
    the radius of a CD is 0.06 m and it rotates at 3.5 rew/ s when playing music at the outer edge.find the maximum tangential speed of the disk.
  22. Science
    2.40g of copper (ii)tetraoxosulphate(iv) crystals are prepared from 0.45g of copper (ii) oxide.the copper (ii) tetraoxosulphate(vi) crystals contain 0.45g of water of crystallisation.what mass of crystals and what is the mass of water of crystallisation would be obtained from ...
  23. science
    An organism is capable of both sexual and asexual reproduction. How could this affect the variability of genes in the members of its species?
  24. science
    1.Write 2 paragraphs to explain what you understand by trends and demand of the job market
  25. English
    Can you check for punctuation errors, and improper formatting in my essay? Thank you so much Mathematics resolves abstract problem situations of daily life, strengthens the mental calculation, having as the base a logical order that contributes to the study of numbers, figures...
  26. science
    write an equation relating the concentration of a reactant A at t=0 to that of t=t for a first order reaction. Define all the terms and give their units. Do the same for a second order reaction.
  27. science
    write an equation relating the concentration of a reactant A at t=0 to that at t= t for a first order reaction.
  28. 6th grade math
    it takes harrison 1 1//2 hours to finish his history project. it takes miles 3 2/3 hours to finish his science project. how many times as long does it takes miles to finish his science project than it takes harrison to finish his history project? Do I have to subtract or divide?
  29. Algebra
    A student receives his grade report from a local community college, but the GPA is smudged. He took the following classes: a 2 hour credit art, a 3 hour credit history, a 4 hour credit science course, a 3 hour credit mathematics course, and a 1 hour science lab. He received a...
  30. science
    an object in equilibrium the net torque acting on it vanishes only if each torque is calculated as: a. The center of mass b. The center of gravity c. The geometric center d. The point of application of force e. The same point
  32. Science
    What is Biotechnology? Examples of Biotechnology and the use of it in society.
  33. science
    the potential difference between a cloud and the earth is 1000000000. in a lightning bolt 20c of charge pass from the cloud to the earth in a time of 0.004. calculate the current that flows from the cloud to the earth.
  34. Science- Chemistry
    The proteins in a mammalian cell account for 18% of its net weight. If the density of a typical mammalian cell is about 1.1 g/mL, and the volume of the cell is 4x10-9 mL, what is the concentration of protein in mg/mL?
  35. science
    a sphere A of mass 3.0kg moving at 8.0m/s collides with another sphere B of mass 5.0kg moving in opposite direction to A at 4.0m/s.find the velocities of the spheres immadiately after the impact if e=0.30
  36. Science
    The t1/2 for a first order rxn is 20 s.the time required for 99.9 percent decomposition is
  37. Science
    In how many years will a 80 mg of sample of C14 with t1/2 5760 years be reduced to 20 mg
  38. Life science
    Explain the scientific interpretation of the fossil found in the credle of humankind
  39. Science
    How can two people hold the same piece of paper at the same time without being able to touch each other and without tearing the paper?
  40. math
    Find my average science test score is : 89,90,95,72,83,100,94
  41. science
    an object of 3cm length is placed 5cm away from thin converging lens. The image formed by the lens is upright, virtual and of length 5cm by a ray diagram, determine the focal length of the lens
  42. physically science
    Two point charges are fixed on the y axis, a negative point charge q1 = −25 µC at y1 = +0.22 m and a positive point charge q2 at y2 = +0.34 m. A third point charge q = +8.4 µC is fixed at the origin. The electrostatic force exerted on the charge q by the other two charges ...
  43. Science
    What is the history of the QUANTUM THEORY?
  44. Science
    A net force of 200n gives a body of mass m1 an acceleration of 80m/s2 and a body of mass m2, an acceleration of 240m/s2. The acceleration that this force causes when the masses combine together is -
  45. Maths literacy.geography,life science,history
    I have passed matric..Which career is suitable for me if am doing this subjects? maths literacy level 2#agricultural sciences level 3#geograpy level2#history level 3#life sciences level 2#lsixhosa level 6# English FAL level 3.. I really need help
  46. Science
    Newton 3rd law
  47. Science
    The eighth term of a linear sequence is 18 and twelveth term is 26.Find the first term,common difference and 20th term
  48. science
    a stone 5kg was tied to an elastic rope 12m of length it was pulled until 60 was made at the top ,when 180m reach ,calculate the distance which the stone move and force which was applied to move the stone
  49. science
    Harmful substances could contaminate food
  50. Science
    What is the IUPAC name FOR CH3COOC2H5
  51. science
    is the earth flat?
  52. maths lit ... Geography ..life science tourism
    so which career can I follow using this subjets
  53. Earth science
    How do I calculate 220grams of c-14 to 55 grams of c-4?
  54. science
    how will you seperate water salt wood shavings small pins and marbles in 5 steps
  55. English
    1. (1) On the last day of February, Forrest wanted to see whether or not it was finally warming up outside. (2) To find out, he donned his favorite coat, which he had received for his birthday, and headed outdoors. (3) He shut the door behind him, locked it, and started ...
  56. Science
    Mass of the moon is7×10^32kg and radius is 1740km
  57. Science
    Mass of the moon is7×10^32kg and radius is 1740km
  58. Science
    Mass nof the moon is7×10^32kg and radius is 1740km
  59. Maths literacy life science and geography
    Can i become a nurse if i studyed maths literacy life science and geography?
  60. Research
    What Science Investigatory Project ideas can you recommend for a tenth grader?
  61. Science
    Which of the following is true about the single-celled paramecium? A. It is an example of a higher form of animal B. It has life functions similar to ours C. It lacks the ability to circulate D. It lacks life functions
  62. computer science
    In a database system,within a banking system application,transaction between A is transferring 1000 from Acc1 to account Acc2 at the same time,transaction B is processing every records and adding interest payment by increasing each balance by 1.5 percent initially Acc1 has a ...
  63. Science
    Write the valency of E from EO3.
  64. Science
    What is the valency of E from E2(O3).
  65. Science
    The magnitude of the electrostatic force between two identical ions that are separated by a distance of 5.0A is 3.7×10^-9N. a) what is the charge of each ion? b) how many electrons are missing from each ion( thus giving the ion its charge imbalance)?
  66. Science
    When H2SO4(aq) is exactly neutralised by Mg(OH)2, the hydroxide ion concentration in the resulting solution will be ?
  67. science
    Cell structure involved his photosynthesis and respiration.
  68. Science
    Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia? A) water B)urea C)lysozymes D)sebum Is it (A)?
  69. Science
    A study demonstrates that treatment of peptic ulcers with antibiotics results in improvement in a large number of patients. This implies that A. antibiotics neutralize stomach acid. B. these ulcers are caused by a bacterial infection. C. pressure ulcers can be treated in the ...
  70. science
    Independant variable: Temperature of the room (three temperatures) Dependant variable: Length of the candle after it has burned for 30 minutes Constants (control variables): Type and length of candle, diameter of candle, and time that the candle is allowed to burn. Need help ...
  71. science
    What volume of 0.1M Of sulphuric acid is needed to neutralize 100cm³ of a solution of sodium carbonate of mass concentration 20gram over dm³
  72. science
    define combustion?
  73. Science
    Topic: Candles I was given a task to write an introduction for a report and according to the marking rubric, it must "justify the purpose of the investigation with relevance to real world applications with sources cited. Provides sufficient relevant background information and ...
  74. science
    I have been given the task to prove a hypothesis by conducting an experiment. Hypothesis: A candle will burn slower in a cooler environment. Independant variable: Temperature of the room (three temperatures) Dependant variable: Length of the candle after it has burned for 30 ...
  75. Science
    What is the significant concentration of 75.0 of ethanol dissolve in 580.0 g of water?
  76. Science
    How will you prepare a 200cm³ of 70% of ethanol solution?
  77. Science
    Show that FαβFαβ is Lorentz invariant, where the symbols carry their usual meaning. In second Fαβ are in prefix..
  78. science
    Why do projectile motoin follow a parabolic path way
  79. Science
    What is the gap called in the neuron? a. dendrites b.axon c.myelin sheath
  80. Science
    How many moles of kmno4 are required to oxidised 2moles of ferric oxilate into ferric ion and CO2 gas in acidic medium.
  81. Rock view science Bcs,education
    A criminal is escaping across a rooftop and run off the roof horizontally, the horizontal distance between the two buildings is 3.4m and roof of the adjacent building is 2m below the jumping off point. What would be the maximum speed needed by the criminal?
  82. Natural science
    What will happen if a positively charged glass rod is brought near another positively charged glass rod that is suspended by a silk thread
  83. Science
    Find the first partial derivative of the functon f ( x , y ) = 2 x 3 y 2 + y 3
  84. Natural science
    What will happen if a positively charged glass rod is brought near another positively charged glass rod that is suspended by a silk thread
  85. Science
    What is the collective term for isoterm,isomer,isobar,isotone, and isotope?
  86. science
    A man pulls a box with a force of 70N along the positive Y-axis, while a boy pulls it with a force of 50N, making an angle of 80°counter clockwise with the positive Y-axis. (1)In what direction should the second boy apply a force of 60N so that the box will move along the ...
  87. Math
    Vikram spent 1/4 of his money on a science textbook and 2/3 of the remainder on stationary. What fraction of his money did he have left ?
  88. Science
    A particle completes 4 revolution per second on a circular path of radius 0.25m. Calculate the angular velocity of partical
  89. Science
    What is the difference between an atom and a molecule?
  90. Science
    The dimensional formula of density of pressure is D= force/ area = Md^-1T^-2 What does M, d and T and their exponents mean?
  91. Maths lit , science, tourism, Speedo,geography
    Can I do nursing with those subject?
  92. Science
    A sample of natural gas is 80.0% CH4 and 20.0% C2H6 by mass. What is the heat from the combustion of 1.00 g of this mixture?
  93. Science
    Why does sound waves travel faster in wood than in air or water?
  94. Science
    Bubbles appear when you open a bottle of soda but not when open a bottle of mineral water. why?
  95. Science
    Sound waves travels faster in wood than in air or water.why?
  96. Science- dimensional analysis
    What is the wavwlentgh in meters of orange light of wavelength 615nm? Convert 6ft to meters and 168lb to kg.
  97. Science
    Whatvis the difference bet extensive and intensive properties? Please give an example thanks
  98. Science- significant figures
    Find the answer with its correct number of significant figures. 4.311 x 0.07 =?
  99. science
    results of the investigation effects of molecular forces on the surface shape of meniscus shape of droplet . substances are water , oil ,glycerine , nail polish remover and methylated spirit
  100. science
    A study demonstrates that treatment of peptic ulcers with antibiotics results in improvement in a large number of patients. this implies which of the following
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