help i am confused about this riddle. IF NOTHING IS FASTER THAN LIGHT HOW DID THE DARK GET THERE FIRST

Identify the type of synthetic material used in each object

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.