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  1. J

    Ballistic Pendulum and Arrow

    So, I need to find the velocities of two arrows but I don't know what formulas to use. Can anyone point me in the right direction? http://img247.imageshack.us/img247/9376/okjen2.jpg [Broken]
  2. J

    Force, distance, and a constant

    Homework Statement As an exercise, a woman pulls on both sides of a stiff spring to work on her chest muscles. The spring stretches 7.2 cm when she pulls on it with a force of 111 N. She then makes a greater effort and stretches the spring 17 cm. a. Write an equation relating the force, F...
  3. J

    Width measurements and conversions

    So I converted 0.18 centimeters to micrometers and got 1800 micrometers. So then, I just take 1800 micrometers divded by 9.45 micrometers to get how many will fit across? 1800/9.45. I came up with 190.476, but since I can only have two significant figures in my answer, it would be 190 algae...
  4. J

    Width measurements and conversions

    Couldn't I just convert 9.45 micrometers to centimeters and divide by 0.18 cm to get the thickness between the gaps in terms of algae thicknesses?
  5. J

    Width measurements and conversions

    Homework Statement a. How wide is the gap between tiles in centimeters? b. How wide is the gap in inches c. How many algae-thicknesses is the gap between tiles Homework Equations The Attempt at a Solution First off, I just want to know if I did a and b correctly. To set up...
  6. J

    Need to make sure I am doing these problems correctly.

    So you think that this setup is fine?
  7. J

    Need to make sure I am doing these problems correctly.

    Thanks for the input. Good to meet you.
  8. J

    Need to make sure I am doing these problems correctly.

    Measurement problems: Mass, weight, unit conversion Homework Statement Homework Equations 1 galbitter = 3.831 Kg 1 galpure = 3.785 1 gal = 8 pints 1 lb = 0.4535 Kg 1 lb = 16 ounces The Attempt at a Solution So, for a I took 1 galbitter= (3.831Kg/1gal) x (1lb/0.4535Kg) =...
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