Does electro magnetic waves require a medium to travel though one location

What type of relationship exists between the length of a wire and the resistance, if all other factors remain the same? Resistance is directly related to length. Resistance is directly related to the square of the length.

What do elements in the first two columns of the periodic table have in common? A. They have two valence electrons. B. They tend to lose electrons to gain stability. C. They react strongly with the alkali metals. D. hey do not react with halogens.

Two fluids that make use of water

Summarize what you read on the three websites you visited by identifying the advantages and disadvantages of using plastics.

Estimate how much solar energy reaches the earth per year (in Joule).

A book is sitting on a table at rest. Which of the following best describes the forces acting on the book? A.

When NASA's Skylab reentered the Earth's atmosphere on July 11, 1979, it broke into a myriad of pieces. One of the largest fragments was a 1770-kg lead-lined film vault, and it landed with an estimated speed of 120 m/s.?

A spring gains 2.34 joules of elastic potential energy as it is compressed 0.250 meter from its equilibrium position. What is the spring constant of this spring? (1) 9.36 N/m (3) 37.4 N/m (2) 18.7 N/m (4) 74.9 N/m

Form hypothesis: Where do you think we humans get energy?

The distance from home plate to the pitchers mound is 18.5 meters. For a pitcher capable of throwing at 3.85m/s (86mi/hr), how much time elapses between the release of the ball and the ball passing home plate?