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  1. K

    Very hard mechanics question

    1. Homework Statement a pendulum of mass m and length L is pulled back an angle θ and released. After the pendulum swings through its lowest point, it encounters a peg α degrees out and r meters from the top of the string. The mass swings up about the peg until the string becomes slack with the...
  2. K

    A free falling object

    Can somebody please show me how to solve this problem? A flowerpot falls off a windowsill and falls past the window below. You may ignore air resistance. It takes the pot 0.420 s to pass this window, which is 1.90 m high. How far is the top of the window below the windowsill from which the...
  3. K

    Dr. Evil Problem

    Can somebody help me please to solve this problem? helicopter carrying Dr. Evil takes off with a constant upward acceleration of Secret agent Austin Powers jumps on just as the helicopter lifts off the ground. After the two men struggle for 10.0 s, Powers shuts off the engine and steps out of...
  4. K

    Automobile Airbags

    The human body can survive an acceleration trauma incident ( sudden stop) if the magnitude of the acceleration is less than If you are in an automobile accident with an initial speed of and you are stopped by an airbag that inflates from the dashboard, over what distance must the airbag stop you...