quiz7

  1. A 50gram dart his fired straight at a nearby dartboard at a speed of 10.00m/s. The board has a mass of 1.95kg and is mounted so that a spring compresses when struck by the dart (like your bathroom scale but mounted on the wall). This can measure how hard you threw the dart. All motion and compression is horizontal...gravity is negligible here. What is the initial momentum and kinetic energy of the dart.
    a) 500kg m/s, 2500J
    b) 0.500kg m/s, 2500J
    c) 0.500kg m/s, 2.50J
    d) 0.500kg m/s, 5.00J
    e) 10.0kg m/s, 2.50J
    No answer given yet
  2. Immediately after the dart sticks into the board (before the spring has any time to compress yet), what is the momentum and kinetic energy of the total system?
    a) 0.0025kg m/s, 5.00J
    b) 0.0025kg m/s, 2.50J
    c) 0.500kg m/s, 0.0625J
    d) 3.160kg m/s, 2.50J
    e) 3.160kg m/s, 0.0625J
    No answer given yet
  3. The dart and dartboard system cause the spring to compress by a maximum of 0.500cm. What is the spring constant of the spring?
    a) 2.00E5 N/m
    b) 500.0 N/m
    c) 4.00E5 N/m
    d) 5000 N/m
    e) 125 N/m
    No answer given yet