How far away is a train if you see the steam from is nozzle 4.5 seconds before you hear its sound?(take speed of sound as 331 m/sec)​

The government has declared that a hurricane is likely to hit the east coast. which government division is part of acf and provides guidance to citizens? a. job opportunities for low-income individuals b. office of human services emergency preparedness and response c. assets for independence d. low-income home energy assistance program

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

In a hydrogen molecule there are a total of four charges, 2 protons in the two nuclei, and 2 electrons. how many unique charge-pairs are there (without double counting)?