Water flows through a multisectional pipe placed horizontally on the ground. the velocity is 3.0 m/s at the entrance and 2.1 m/s at the exit. what is the pressure difference between these two points? neglect friction.

Phase changes are chemical changes. true or false

You will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. (refer to the walk-through video to locate the online lab within the online textbook).

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron