9. Think & Calculate A train on a straight track goes in the positive direction for 5.9 km, and then backs up for 3.8 km. (a) Is the distance covered by the train greater than, less than or equal to its displacement? Explain. (b) What is the distance covered by the train? (c) What is the train's displacement?

Newton's law of universal gravitation states that the force f between two masses, m1 and m2, is given below, where g is a constant and d is the distance between the masses. find an equation that gives an instantaneous rate of change of f with respect to d. (assume m1 and m2 represent moving points.)

Which object is most likely represented by a dot?

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