An unmanned spacecraft leaves for venus. which statements about the spacecraft’s journey are true?
the weight of the spacecraft keeps changing.
the mass of the spacecraft keeps changing.
the weight of the spacecraft remains the same.
the mass of the spacecraft remains the same.
the gravitational pull on the spacecraft remains the same.

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