Two trains start at opposite ends of a 1 km railroad system. The first train moves right at 25 m/s and the second train moves left at 20 m/s. Assume that the first train moves with a positive velocity. Calculate the point at which these two trains meet.

What type of nuclear decay causes the atomic number of an element to increase by 1?

Which statements describe the movement of ocean currents around the globe? check all that apply. strong winds force warm water to sink to the ocean floor. the coriolis effect causes warm and cold water to mix. cool dense water sinks to the ocean floor. warm water replaces cool surface water. wind blowing parallel to the shore causes upwelling of cool water.

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