keannu
VIP Member
- Joined
- Dec 27, 2010
- Member Type
- Student or Learner
- Native Language
- Korean
- Home Country
- South Korea
- Current Location
- South Korea
Is this drag made by the rope or the natural one of the water? It's confusing. If it is the water one, how is it related to pulled rope? I'm all confused.
ex)Some scientists measured the drag that a seal must overcome in swimming. To do it, first they trained seals to chomp down on a rubber mouthpiece that could be pulled by a rope. Then they measured the pounds of force on the rope when the seals were towed at a different speeds both at the surface and sumberged in a swimmming pool. As expected, the faster the seal was moving, the greater the drag force that worked against that movement. At a higher speed of four miles an hour the surface drag was almost three times greater than the submerged drag. But even at the seal's low cruising speed of three miles per hour, drag at the surface was almost two times greater than the drag when submerged. The researchers concluded that swimming below the surface must be a lot easier.
ex)Some scientists measured the drag that a seal must overcome in swimming. To do it, first they trained seals to chomp down on a rubber mouthpiece that could be pulled by a rope. Then they measured the pounds of force on the rope when the seals were towed at a different speeds both at the surface and sumberged in a swimmming pool. As expected, the faster the seal was moving, the greater the drag force that worked against that movement. At a higher speed of four miles an hour the surface drag was almost three times greater than the submerged drag. But even at the seal's low cruising speed of three miles per hour, drag at the surface was almost two times greater than the drag when submerged. The researchers concluded that swimming below the surface must be a lot easier.
