When observing an object, you determine it is moving at a constant velocity and in a straight line. which of these best describe the situation? a) there are no forces acting on the object b) the net force acting on the object must be zero c) the net force acting on the object is pushing in the same direction the object is traveling d) the net force acting on the object is pushing in the opposite direction the object is traveling

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

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