The average speed of sound in water is 1,500 m/s. How long would it take a sound wave to travel 250,000 km? (HINT: Use your dimensional analysis and metric conversion skills and remember:
K H D u d c m)

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.