A 6.0kg block rests on top of a 7.0kg block, which rests on a horizontal table. (Hint: change in direction but same magnitude) a. What is the force (magnitude and direction) exerted by the 7.0kg block on the 6.0kg block?

b. What is the force (magnitude and direction) exerted by the 6.0‐kg block on the 7.0‐kg block?

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 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. 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 warm balloon expands and rises. the cold balloon shrinks and sinks.