(c) Twelve waves pass an observer in four seconds.
What is the frequency of the waves? Show clearly how you work out your answer
and give the unit.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

Why do astronauts in the space shuttle weigh less?