Two protons are separated from a single electron by a distance of 2*10^-5 m. Find the electrostatic force between them. Is this force attractive or repulsive? Show all work.

Acylindrical specimen of a nickel alloy having an elastic modulus of 207 gpa (30 × 106psi) and an original diameter of 10.2 mm (0.40 in.) experiences only elastic deformation when a tensile load of 8900 n (2000 lbf) is applied. compute the maximum length of the specimen before deformation if the maximum allowable elongation is 0.25 mm (0.010 in.)

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

What is the major limitation to the light microscope?