the first time you hear a sound it took 2.6seconds and takes 7.1 seconds for you to hear an echo the speed of sound is 340m. s how wide is the river

What are chlorofluorocarbons and what impact do they have on the atmosphere?

The 10-kg double wheel with radius of gyration of 125mm about o is connected to the spring of stiffness k = 600 n/m by a cord which is wrapped securely around the inner hub. if the wheel is released from rest on the incline with the spring stretched 225 mm, calculate the maximum velocity v of its center o during the ensuing motion. the wheel rolls without slipping

For which pair of objects would adding the same a