Identical balls are dropped from the same initial height and bounce back to half the initial height. in case 1 the ball bounces off a cement floor and in case 2 the ball bounces off a piece of stretchy rubber. 1)in which case is the average force acting on the ball during the collision the biggest?

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

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.