1. SCIENCE
    Barry used a ramp to transport a load to a truck. The ramp made work easier by : 1) reducing the size of the input force 2) reducing the input force to zero 3)changing the distance over, which the input force was exerted 4) reducing the output force to zero I think #3
  2. Science
    My sister plays her PS4 all day and whenever her remote vibrates while it's sitting on the couch, I can feel the vibration from a different seat. I don't understand how the vibration of a little remote can move throughout a whole, large couch.
  3. SCIENCE
    The handle of a tennis racket is enclosed in rubber. What is the function of the rubber handle? 1)to increase energy 2)to increase weight 3)to increase friction 4)to increase force I think # 3
  4. science
    how many grams of nacl are required to neutralize 100 ml of 1M h2so4???
  5. Science
    Draw a dot plot representative of a flow cytometry test that looks at two markers. One marker is diagnostic, while the other marker is prognostic. Identify and name your markers and their detecting antibodies. Complete the plot as you wish and correctly interpret it. 
  6. Science:Just need quick help
    I am very tired and can hardly think straight. Thanks in advance to those who help. The amount of each size particle in soil is the particle size distribution. Is putting soil and/or sand in a bottle of water a good way to determine particle size distribution? Why or why not?
  7. Science (HELP ASAP)
    1. Which of these is not an environmental effect of building dams A. Reduced fertility downstream<<< B. Weed growth downstream C. Increased water temperature D. Soil erosion upstream 2. Which of these is not an environmental effect of destroying wetlands A.smog B....
  8. Science
    Electromagnetic and mechanical waves have different characteristics that make them advantageous for certain applications. Select the reasons that mechanical waves, such as ultrasound, are used for soft tissue imaging and to identify fractures in metals. Question 1 options: ...
  9. Science
    When plants grow toward sunlight they____ A. Live longer B. Get more light C. Get smaller D. Die faster
  10. Science
    Which of the following boxes below represent a stable system? Describe how a disturbance to this box would affect it. Use the terms center of mass and equilibrium in your response. Box A: Shaped like a diamond on a flat surface with an arrow pointing downwards. Box B: A square...
  11. physical science
    If sam drops a 40 kg mass from a height of 20 meters on earth how much was the potential energy of the mass before he dropped it a-800 j b-784 n-m c-800 n-m d-7840 j e- 200 j
  12. physical science
    a 500 kg elevator is lifted 10. How much work was done a 50 j b 50 j /kg c 5000 j d 5000 j/kg degree c
  13. Creating High-Quality Centers
    Which of the following statements accurately reflects what we know about facilitating science learning for infants and toddlers? A. It's important to have a science circle each week where the teacher demonstrates a science concept to the infants and toddlers. B. Infant and ...
  14. science
    If sam drops a 40 kg mass from a height of 20 meters on earth how much was the potential energy of the mass before he dropped it a-800 j b-784 n-m c-800 n-m d-7840 j e- 200 j
  15. Physical Science
    What are the products of a double replacement reaction between potassium bromide and silver nitrate? Name the resulting compounds.
  16. science
    1) At body temperature of 36.5 ° C the osmotic pressure of the blood is of 7.80 atm. Calculate the mass of glucose (C6H12O6) that must be added to one liter of a solution containing 5 g / L of NaCl to be able to inject directly into a vein.
  17. science
    Suppose an ideal car jack has an input work 2750 J. It lifts a car 0.35 meters in 8 seconds. a. What is the output work of the jack? b. How much power is required to lift the car? c. What is the efficiency of the jack? I can't give a answer because I am very confused.
  18. science
    Suppose an ideal car jack has an input work 2750 J. It lifts a car 0.35 meters in 8 seconds. a. What is the output work of the jack? b. How much power is required to lift the car? c. What is the efficiency of the jack?
  19. Science
    Which of the following would best explain why a species of wildflower native to Switzerland is observed growing in the wild in Montana? Wind dispersed seeds of the wildflower.* Water dispersed seeds of the wildflower. A human brought and dispersed the seeds. Is this right?
  20. maths
    In a group of 50students,35 students like only one subject out of english & science.The ratio of students who like both & who dont like both is 1:2.Find the number of students who like both the subject.
  21. science
    a car is used to move a crest of mass of 645kg on a horizontal road the horizontal force exerted is 15000n the coefficient of kinetic friction is 0.8 calculate the acceleration of the car
  22. Science
    1. What is the main difference between mechanical and electromagnetic waves? A. Mechanical waves involve transfer of energy, electromagnetic waves do not. B. Mechanical waves require a medium to travel in, electromagnetic waves do not.~~~~ C. Mechanical waves have amplitude ...
  23. Science
    1. What is the main difference between mechanical and electromagnetic waves? A. Mechanical waves involve transfer of energy, electromagnetic waves do not. B. Mechanical waves require a medium to travel in, electromagnetic waves do not.~~~~ C. Mechanical waves have amplitude ...
  24. Science
    1. What is the main difference between mechanical and electromagnetic waves? A. Mechanical waves involve transfer of energy, electromagnetic waves do not. B. Mechanical waves require a medium to travel in, electromagnetic waves do not.~~~~ C. Mechanical waves have amplitude ...
  25. Science
    Hybridisation of C in [ CH triplebond C sinlebond CH doublebond CH2 ]
  26. science
    Two objects slide over a frictionless horizontal surface. The object A with a mass of 5000g is moves at a speed of 4.5m/s toward the object B (mB= 2500g) which is initially at rest. After the collision, both objects are directed to 30O on either side of the original line of ...
  27. science
    Write the structural formula of 2,3,5-trimethyl-4-propylheptane.
  28. science
    1 litre of coffee at 80oC need to be cooled to 40oC. Assuming that all the ice melts and no heat is lost to the environment. Take the specific heat capacity of coffee to be 4200J/kgK, density of coffee to be 1000kg/m3 and latent heat of fusion of water to be 3.34 x 105 J/kg. ...
  29. basic science
    1 litre of coffee at 80oC need to be cooled to 40oC. Assuming that all the ice melts and no heat is lost to the environment. Take the specific heat capacity of coffee to be 4200J/kgK, density of coffee to be 1000kg/m3 and latent heat of fusion of water to be 3.34 x 105 J/kg. ...
  30. Science
    The following sphere is responsible for forming the solid shell of Earth that holds up life? -Hydrosphere -Lithosphere -Atmosphere -Biosphere** Explain the interaction between the four main components of Earth's physical systems. Be sure to include the name of each system and ...
  31. Science
    where is the crater of the asteroid that killed the dinosaurs
  32. Science
    What is the main difference between mechanical and electromagnetic waves? A. Mechanical weaves involved transfers energy; electromagnetic waves do not B. Mechanical waves require a medium to travel in; electromagnetic waves do not***** C. mechanical waves have amplitude and ...
  33. science
    An elephant of mass 500kg stand with all four feet on the ground.Each foot has an area of 0.08m2.Calculate the pressure exerted on the ground.(g=10/s2)
  34. Science
    What is the difference between short-circuiting and overloading? From what I can gather from my textbook, both happen as a result of external resistance being lesser than the sum of internal resistance.
  35. Science - Plate Tectonics
    Where does the source of heat for Earth’s convection currents come from
  36. Science-tectonic plates
    What occurrence is caused when transform plates get stuck?
  37. science
    why does the load reaches 50 meters from the ground will the correct position of the PE and KE that the problem isa crane lifted a 1000 kg load to a height of 50 meters from the ground. at which position are the PE and KE of the load equal
  38. Science
    Find molecular mass of an element having- Density= 1.56 gm/l Temp.= 65 degree Celsius Press.= 745mm
  39. Science
    Which tunable property is the great thrust in biological and medical sciences? A) physical B) chemical C) biological D) none
  40. Science
    What is the increment in power if current increases by 1% and resistance remain constant
  41. Math,science,social,Hindi,english
    A person weighing 50kg runs up a hill raising himself vertically 10m in 20sec. Calculate the power of the person.
  42. Science
    Granite lasts a long time when it is used for building in areas where
  43. Materials Science
    The atomic radii of Mg2+ and F-1 ions are 0.072 and 0.133 nm, respectively. (a) Calculate the force of attraction between these two ions at their equilibrium interionic separation (i.e., when the ions just touch one another). (b) What is the force of repulsion at this same ...
  44. Science
    How many grams of NaOH will be needed to prepare 250ml of 0.1M solution:-
  45. Science
    When a silvery powdery substance was added to boiling beans,the beans get cooked quicker than normal. what may this be?
  46. science
    were must be the pivot situated on a straight lever 2m long,if a downward effort of 200N at one end is to lift a mass of 50kg at the other end.state the distance from the effort.
  47. Physical Science
    If Argon is 39.948, calculate average at kc mass of argon
  48. Mrs Sue Plz help (Science)
    How is an mold and a cast related
  49. science
    A 13,500 kg jet is moved with a thrust of 5,224,700 Newtons west. what is the acceleration of the jet?
  50. science
    How does a sequoia tree sustain itself and support bad weather if its roots are short?
  51. Science
    How are a mold and a cast related Someone plz help
  52. natural science/bio
    flow diagram of circulatory and respiratory system combined
  53. Science (check my answers)
    14. Chemical runoff from fields, oil spills, and erosion is the major source of a. air pollution b. water pollution*** c. hydropower d. renewable energy 15. Which compound causes the depletion of earth's ozone layer? a. ultraviolet radiation*** b. chlorofluorocarbon c. carbon ...
  54. Science (check my answers)
    11. How do fossil fuels contribute to air pollution? A. By releasing carbon dioxide into the air*** B. By recycling oxygen C. By reversing the greenhouse affect D. By releasing nitrogen into the air
  55. Science
    1. Which of the following is the most effective way to preserve biodiversity? A. Captive Breeding B. habitat destruction C. habitat preservation*** D. habitat fragmentation 2.which of the following would result in the greatest reduction of waste A)composting food waste B)...
  56. Science
    Plzz Help me i need help Why is California's high speed rail such a groundbreaking effort??
  57. Science
    Which statement correctly describes the sun and earth? a. the sun and earth both have water. b. the sun and earth both have a surface called the crust. c. the sun and earth both have an atmosphere d. the sun and earth both have breathable air
  58. science
    A ray of light travelling in air strikes the water surface at an Angle of 30 degree calculate the Angle of light refraction if refractive index of glass is 1.5
  59. chemistry
    name an invention or event (related to science or technology) from the past 100 years that you think has helped shape the roles of women today.
  60. science
    Formic acid ,HCOOH, is a monoprotic acid. circle the acidic hydrogen. Write the formula of the conjugate base after the acidic hydrogen is lost.
  61. Science
    Calculate and give answer of appropriate number of significant digits A. 7.6 x21.9 B. 2,15 x 3.1 x 100 C. 38/7
  62. Science, 10th class
    Is the resistance of a resistor change when it cuts into 3pieces
  63. Science
    1- Freezing of water is ____ change. 2- A solid which dissolve in water is called ____
  64. Science
    In a heat engine, if 700 J of heat enters the system, and the piston does 400 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200?
  65. Physical Science
    A 10 N object rests on a 10° incline. What is the normal force? What is the parallel force? A 10 kg object rests on a 10° incline. What are the normal and the parallel forces?
  66. science
    A ray of light travelling in air strikes the water surface at an angle of 30 degree calculate the angle of refraction if refractive index of glass is 1.5
  67. Science
    How much more concentrated is 1ml of 0.5mg/ml haemoglobin in 10% sucrose at an absorbance of 2.4, compared to a solution of 0.1ml of 0.5mg/ml haemoglobin in 10% sucrose and 0.9ml of 10% sucrose at an absorbance of 0.350
  68. Science
    Why is it better to use a micropipette that can transfer 200 microlitres or less, to transfer 200 microlitres, over using a pipette that can transfer 200 microlitres or more?
  69. science
    How many moles of carbon monoxide are needed to react completely with 108 kg of Fe2O3. Fe2O3(s)+CO(g)→Fe(s)+CO2(g)
  70. Science
    The seeds develop into BLANK and are dipersed
  71. Science
    Can Someone explain this? Should other states wait to see if the high-speed rail system works well before starting their own plans for similar systems?
  72. Science
    Match the question with the correct conversion factor needed. Column A 1.What is the mass, in grams, of a single atom of carbon?: 2.What is the mass, in grams, of a single atom of iron?: 3.What is the mass, in grams, of a single molecule of water?: 4.What is the mass, in grams...
  73. Science
    What mass of sodium has the same number of atoms as 50.0 g of calcium?
  74. Science
    Discuss your opinion of the consequences of artificial selection and the advantages and disadvantages of using genetic information in society. Use facts from your research to support your opinion. Cite the sources for your facts. Also, discuss your answer to the Apply the Big ...
  75. science
    10. How does a star's life begin
  76. Science
    1.Acceleration involves a change in? A.time B.direction C.speed D.both direction and speed I think it's D?
  77. Science Plz help
    How were the Aborigine people affected when their children were forced to live with British families or in institutions?
  78. Science: Chemistry
    What is the mass percent of oxygen in sodium bicarbonate(NaHCO3)?
  79. Science
    1. groups/ family of elements are ones which: A. Have the same number of electrons in the valence/ outer engery level B. Have exactly 8 electrons in the valence shell outer energy level C. Have the same number of protons in the nucleus 2. A period represents elements which? A...
  80. Science
    What are 4 producers, 4 consumers, and 2 decomposers you would find in a Pennsylvania ecosystem
  81. Science
    PLEASE CHECK MY ANSWERS :) answers marked below 1. Which of Earth’s spheres contains most of its mass? (1 point) atmosphere *** hydrosphere geosphere biosphere 2. Erosion and weathering are examples of which types of forces? (1 point) constructive forces destructive forces...
  82. Science
    Jordan is doing a science fair project on the effects of music and growth of tomatoes.he has two tomato plants, plant A and plant B that he grows in a window and gives the same amount of water. Plant A is exposed to classical music using headphones atttached to the soil. ...
  83. science
    How do we identify or interpret when to get the screen away or towards the mirror in different situations? Please tell me diff. cases---phy practicals
  84. Science
    How are cheetos made?
  85. Science
    How do you fix an ink machine
  86. Science
    What unit would be the most appropriate to use when measuring(in S1 units)the length of a pencil
  87. science
    The half life of radium is 1590 yrs. how long will it take to 1 gm of element to loose 0.1gm
  88. Science
    18. The description of the structure of the atom is called the ___. ATOMIC MODEL 19. In a water molecule, two atoms of hydrogen and one atom of oxygen share electrons. A ______ bond is found in a water molecule. COVALENT BOND 20. Sodium chloride is formed when the metal ...
  89. Essentials og Psychology
    The science of the mind questions please for Penn foster. No need of answers. Please help.
  90. Science
    1. granite lasts a long time when it is used for building in areas where
  91. Science
    1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer.  I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper.  2. A bucket of paint spills on your ...
  92. Science
    A uniform have metre rule,pivoted at 20cm mark balances horizontally when a mass of 50g is suspended from 4cm mark calculate the mass of the metre rule.
  93. science
    1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer. I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper. 2. A bucket of paint spills on your classroom ...
  94. Science
    which of the following planets are considard rocky venus neptune saturn uranus i think uranus
  95. Science
    When the temperature equals the dew point, what is the relative humidity? A.zero B.10% C.50% D.100%
  96. SCience
    After watching the Farmers and their Lost Dreams: The Dust Bowl Years video segment, reflect back on the stories of two American farming families as they struggled to survive the dust storms that overtook the plains Write a paragraph in reaction to what the survivor shares as ...
  97. Science- Astronomy
    How are Earth and Venus different? I already wrote that they have different atmospheres but I need another reason why are different so can someone help me please?
  98. science
    Astronauts who are working outside the space shuttle require an audio speaker in their helmets because ________. PLEASE HELP!!!!!!
  99. science plz check
    Describe the outer planets. The outer planets, unlike the inner planets, are much larger and made up of gases. They have many moons, and larger rings of ice that go around the entire planet.
  100. science
    describe the inner planets.
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