A cargo ship loaded with iron is floating in a harbor. A crane lifts the iron out of the ship and places it into the water beside it.| PEimpact - Recognizing the impact of PEs
A large fan is mounted to the ceiling of a factory. It’s turned off and perfectly still. An engineer climbs up and places a ping pong ball| PEimpact - Recognizing the impact of PEs
A cylindrical tank with a hole at the bottom drains in exactly 60 minutes when full. How long will it take to drain?| PEimpact - Recognizing the impact of PEs
