Question 12 (1 point) question 12 unsaved which of the following indicates the velocity on a position-time graph? question 12 options: y-axis slope area under the line x-axis

=force × distance a. work b. velocity c. pressure d. momentum

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

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.