Recent content by c_programmer

  1. C

    Which angle is theta and when do I use sin or cos?

    They don't seem interchangeable. Here's a specific problem I just did (and got right). Is the way I used trig towards the top correct (I reasoned that the component passes though the adjacent and hypotenuse so it must be cos)?
  2. C

    Which angle is theta and when do I use sin or cos?

    Not a direct problem but this is a homework related question so I'm posting it here. When getting components with respect to gravity it is often intuitive, this isn't always the case. None of my classes thus far have talked about why when to use sin or cos, they just do. I'm wondering how I can...
  3. C

    How does static friction do work?

    I think I might have an answer. Imagine a box on top of another, there is a large static friction coefficient between the two boxes and none on the floor. When the bottom box is moved the static friction will cause the box to move, thus doing work. Is this correct?
  4. C

    How does static friction do work?

    Homework Statement Static friction can never do work on an object. a. True b. False Homework Equations The answer is False, indicating that static friction can do work. The Attempt at a Solution W=fd, when d=0 w=0 regardless of the force. How does this work? Or is the online...
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