Recent content by bec2008

Homework Statement A proton, initially at rest, is accelerated through an electric potential difference of 500V. What is the speed of the proton? Homework Equations V=k(q/r) Solving for r: r=k(q/v) v=d/t known charge of a proton: 1.6E-19C known value of k: 9E9Nm^2/C2 The...

But I think I'm looking for the tension in the backbone...

Question: A mother leans horizontally over the crib to lift her 16.7 kg baby. The moment arm of the baby about the hip joint is b = 0.53 m. Her upper body has a mass of 58.0 kg and a moment arm of t = 0.450 m. The back muscles are equivalent to a single muscle with an angle theta = 11.5° to the...