A 15 N force and a 45 N force act on in object in opposite directions. What is the net force on the object?

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

In the first law of thermodynamics, triangle e=q-w, what does q stand for

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