You are at a train station, standing next to the train at the front of the first car. The train starts moving with constant acceleration, and 7.0 s later the back of the first car passes you. Part A How long does it take after the train starts moving until the back of the seventh car passes you

Transfer chemicals from one location to another to weather objects. a-water b-physical weathering c-chemical weathering

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

The amount of potential energy possessed by an elevated object is equal to what?