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Homework Help: Assignment help needed. (banked curves, newton's second law)

  1. Oct 19, 2009 #1
    I was solving my assignment questions, and found two questions particularly challenging.
    So I post this thread to get some helps.

    1. The problem statement, all variables and given/known data
    Question 1.

    Astronauts have connected a line between their 3500kg space tug and a 6200 kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. They are at rest, 450 m apart. How much time does it take for them to meet?

    3. The attempt at a solution
    At first glance, I thought that net force is 490N, and can never be stronger. Thus I concluded that this can be simplified such that the space tug is completely still and the asteroid is moving towards the tug with (490/9700)m/s^2. But I'm not so sure about this. In fact I think it's probably wrong. Should I distribute the force to each objects by their percent mass?

    1. The problem statement, all variables and given/known data
    Question 2.
    A suitcase is on a baggage carousel at an airport. The case does not slid and is going around at a constant speed on a circle (r=11,0). The static friction is 0.760 and the angle is 36.
    How much time is required for the suit case to go around once?

    3. The attempt at a solution
    For this one, I don't even know where to start. I used the equation g*r*tan (theta). After that, I was not able to go any further.

  2. jcsd
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