Recent content by Maged

  1. M

    What is the Length of the Ski Slope?

    I think the mass of the skier should be given to find the acceleration and solve.
  2. M

    Finding total mass of hemisphere that has a variable density

    you're true ... so dm=\rho dV only and the term Vd\rho is wrong ...
  3. M

    Finding total mass of hemisphere that has a variable density

    I think something is wrong in your solution My first thoughts: since m=\rhoV \Rightarrow dm=Vd\rho+\rhodV but in spherical : dV=r2sin(\theta)dr d\theta d\phi and z=r cos(\theta) \Rightarrow dz=cos(\theta) dr - r sin(\theta)d\theta hence, d\rho=2 r z dr + r2 dz and substitute for dz then...
  4. M

    NASA Is NASA's direction being reviewed for the future of space science?

    Sorry.. but, What is The Big One?