1.

Two identical charges, each 8.00 E5 C, are separated by a distance of 20.0 cm (100 cm = 1 m). What is the force of repulsion? Coulombs constant is 9.00 E9 N*m²/C² Remember to identify all data (givens and unknowns), list equations used, show all your work, and include units and the proper number of significant digits.

2.

Find the amount of work done in vertically lifting a steel beam of mass 600. kg at uniform speed through a distance of 38.0 m. Remember to identity all of your data, write the equation, and show your work.

3.

Find the wavelength of a wave traveling at 3.26 E6 m/s with a period of 0.0125 s. Remember to identify all data (givens and unknowns), list equations used, show all your work, and include units and the proper number of significant digits.

4.

How would you explain the concept of an expanding universe to a fellow scientist?

please write clearly