Recent content by Error

  1. E

    Instantaneous Acceleration for Uniform Circular Motion

    Homework Statement A normally functioning clock has a radius of 30cm. What is the average acceleration in the first 15 seconds if the second hand starts at 12? What is the instantaneous acceleration when the second hand is at 12? Homework Equations v = d/t a = Δv / Δt limit as Δt...
  2. E

    Weight on a Scale Down an Incline vs. True Weight

    Weight on a Scale Down an Incline vs. True Weight Homework Statement Judy fastened a set of bathroom spring scales to a wedge shaped skate board as shown and coasted freely down a 30 degree slope. The wheels were well oiled and the platform supporting the scales was horizontal. What...
  3. E

    Newton's Laws, Finding Correct Acceleration and Applied Force

    Thank you very much!
  4. E

    Newton's Laws, Finding Correct Acceleration and Applied Force

    If I add John and Brian's mass together, I think I should get: FUN = (m1 + m2)a1 FA = (80 + 60)(7.35) FA = 1029 N
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    Newton's Laws, Finding Correct Acceleration and Applied Force

    Oh! I think I understand! Instead of putting a mass of 0, I should use 80 kg because that is John's mass? I would get: FUN = m3a1 - m2a1 FA = (80)(7.35) - (60)(7.35) FA = 147 N Is 147 N correct?
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    Newton's Laws, Finding Correct Acceleration and Applied Force

    Homework Statement John (mass = 80 kg) rests on the top face of a light cube (mass = 0). A light rope passes horizontally from him over the front edge, and vertically down to Brian (mass = 60 kg) who hangs in contact with the front face as shown. The cube rests on a horizontal surface and...