I KNOW ITS NOT D BUT I NEED HELP Which sentence best states the main idea of this passage from Roosevelt's Four Freedoms speech? A. We are in an emergency situation and must find a quick solution to the problem B. People will have to sacrifice many of their freedoms in order to fight this war. C. All obstacles must be overcome in order to ensure the safety of the United States. D. All Americans must be prepared to fight for the safety and freedom of the United States

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

Who was the first scientist to measure speed as distance over time?