Why is it that when a steadily flowing gas flows from a larger diameter pipe to a smaller diameter pipe, what causes the pressure in the smaller pipe to drop?

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

How would a small bar magnet be oriented when placed at position x?

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?