What are the wavelengths of electromagnetic wave in free space that have the following frequencies?
(a) 4.00 1019 Hz
(b) 5.50 109 Hz

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

Four identical lab carts each have a mass of 200 kg. different masses are added to the carts and the velocities are measured. all carts move to the right.

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine