The force of attraction between a divalent cation and a divalent anion is 2.16 × 10-8 N. If the ionic radius of the cation is 0.074 nm, what is the anion radius?

The de broglie relation λ=h/p can be rewritten in terms of the wave number k as p=kℏ. recall that wave number is defined by k=2π/λ. using the fact that λ=v/f, find the wave numbers k1 and k2 corresponding to frequencies f1 and f2. express your answer as two expressions

What kind of simple machine is a catapult?

A1.5m wire carries a 2 a current when a potential difference of 52 v is applied. what is the resistance of the wire?