PLEASE HELP MEE PLEASE!​

What is the rate of change in a objects position?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?