Gear Ratios When two spur gears (or any other type of gears)are in mesh, the number of teeth in one geardivided by the number of teeth in the other iscalled the gear ratio.Teeth #1 Ã· Teeth #2 = Gear Ratio 2. Gear Ratios and Structures Henri deVick A bout 1000 years ago, three inventions weremade in Europe.peed of Rotation, RPM The spinning or rotational speed of a gear ismeasured in Revolutions Per Minute (RPM).If a gear spins completely around exactly 16times in one minute, itâs going 16 RPM. If itspins exactly 1000.9 times itâs going 1000.9RPM.
In good weather conditions, a wolf can smell its prey from about 1.75 miles away. As the pack of wolves moves closer towards the prey, they will maneuver ahead of the prey for final confrontation. Just by its a sense of smell, a wolf can find and identify other pack members.
A great white shark, for example, would be able to detect a single drop of blood in an Olympic-size pool. Most sharks can detect blood and animal odors from many miles away. Another amazing thing about a shark's sense of smell is that it's directional. The twin nasal cavities act something like your two ears: Smell coming from the left of the shark will arrive at the left cavity just before it arrives at the right cavity. In this way, a shark can figure out where a smell is coming from and head in that direction. Sharks also have a very acute sense of hearing.