Doc Brown holds on to the end of the minute hand of the clock atop city hall. The tangential velocity of the minute hand is 0.419 m/s. If the minute hand is 4.0 meters long, what is the professor's centripetal acceleration?

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

the part of the wave he is travelling on is the crest

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )