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  1. F

    Nonrelativistic Lab-frame Velocity as a function of kinetic energy per unit mass

    Hi everyone--I'm a bit stuck trying to follow a calculation in an article (Nucl. Phys. B360 (1991) p. 145-179) regarding the lab-frame relative velocity of two colliding particles as a function of the kinetic energy per unit mass. (I'll include references to equations in the article, but the...
  2. N

    Thermodynamics work required per unit mass problem

    Having trouble with a thermodynamics problem I'm having a bit of a problem with some of the homework in my thermodynamics class. Question (Water at 20 C, 100 kPa is compressed isothermally to 50 MPa. Determine the work required per unit mass. ) using the tables I found: State 1 T_1=20C...
  3. R

    Measuring Mass per Unit Area of a Soft Blanket

    hi I'm doing a question involving the mass of a blanket ... I just need to know the following : could somebody please tell me : what it means by mass per unit area ? and for a blanket, how is the mass/unit area measured because the blanket is soft ? Roger
  4. A

    Pressure is the change in force per unit of area

    i read somewhere that pressure is the change in force per unit of area and can be represented as the derivative P(A) = dF/dA but in order for it to be the derivative shouldn't it be P(A) = dF/dA lim dA -> 0
  5. dav2008

    What is the density in atoms per unit volume of most nebulas?

    Or is it Nebulae...anyways What is the density in atoms per unit volume of most nebulas? I am just looking for a rough estimate to help me picture it.. And what would it look like if u were inside one..would u even see anything?
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