A15.0-kg board (2.30 meters in length), sits horizontally at rest atop two vertical springs (spring constants of 680 n/m). spring #1 is at the left end of the board while spring #2 is 0.60 meters from the right. describe a free-body diagram for the board. type, source, receiver, and direction must be specified for each force. determine the magnitudes of each of the forces exerted upon the board. determine the compression of each of the springs. note that you will get different answers for each spring, but you should still assume that the board is horizontal (otherwise the problem gets ridiculously complicated).

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.