Saturday, August 27, 2011

Why is water stored below a shuttle launch pad

Water is not stored, but rather sprayed below a shuttle launch pad because, the water mist consists of tiny water molecules floating through the air that are capable of absorbing the tremendous sound energy caused at the shuttle take off. By absorbing the energy the mist prevents reflection of any of it back on to the shuttle and hence prevents damage. Quite a bit of it also evaporates into steam which is seen during take off, but the primary purpose is not cooling, but rather absorption of the sound.

Wednesday, August 24, 2011

Testing a TV remote with a cellphone

To test a remote, put your cell phone in camera  mode and face the remote towards the phone and push a button.Cell phones can see light outside of the visible spectrum and if the remote works you will see the light flash on your camera screen.