I'm Turkish . Where ? I not know speak canada​

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

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

What causes the formation of ocean currents?