Recent content by JUSTaROCK

  1. J

    Work done by motor pulling up elevator

    i got it thank you
  2. J

    Work done by motor pulling up elevator

    sorry don't follow you on the work done per unit time but i do understand the 0 acceleration
  3. J

    Work done by motor pulling up elevator

    Homework Statement A fully loaded freight elevator has a cab with a total mass of 1490 kg, which is required to travel upward 58 m in 2.1 minutes, starting and ending at rest. The elevator's counterweight has a mass of only 985 kg, so the elevator motor must help. What average power is...
  4. J

    Calculate Length of Tinfoil Roll from Mass & Thickness

    rectangle? so find the area of it as a rectangle ok ha ha don't know why i never thought of that
  5. J

    Surface area of basket ball full of sand

    Thank you so much guys really appreciate it
  6. J

    Surface area of basket ball full of sand

    so your saying divide the volume of the basketball by the volume of a grain? then multiply that by the surface area of a grain?
  7. J

    Calculate Length of Tinfoil Roll from Mass & Thickness

    Homework Statement Aluminum, which has a mass of 2.7 grams for each cubic centimeter of volume, can be rolled into thin sheets which your grandparents probably called "tinfoil." If a lump of aluminum of mass 0.75 kg is rolled into such a sheet 18 μm thick and 25 cm wide, approximately how...
  8. J

    Surface area of basket ball full of sand

    Homework Statement A regulation NCAA basketball is a sphere of radius approximately 12 cm. Grains of Texas beach sand are approximately spheres of radius 25 μm. If the inside volume of a basketball were completely filled with sand (assume perfect packing with no empty space) what is the...