Home › AP Physics C: Mechanics › Physics › Linear Momentum and Collisions › How does a jellyfish move itself through water, …
How does a jellyfish move itself through water, according to the source's discussion of momentum conservation?
AIt relies entirely on ocean currents to drift along
BIt flaps a pair of external fins like a fish does
CIt fills its umbrella with water, then jets it out oppositely
DIt uses static electricity to repel itself from the water
Answer & Solution
Correct answer: C. It fills its umbrella with water, then jets it out oppositely
1. Jellyfish propulsion is a clear example of momentum conservation in aquatic animals.
2. A jellyfish fills its umbrella section with water and then pushes that water out as a jet.
3. By conservation of momentum, the jellyfish itself moves in the direction opposite to that jet of water.
4. This is a self-generated jet mechanism, not external fins, ocean currents, or any electrical repulsion.
_Source: OpenStax College Physics (CC BY 4.0), Ch 8 "Linear Momentum and Collisions", section 8.3 Conservation of Momentum_
Related questions
Which parts of the space shuttle does the source describe as reusable across multiple fligWhy does the source say multistage rockets are used instead of trying to build a single-stA single-stage rocket needing to overcome both air resistance and gravity during launch faTo escape Earth's gravity from rest, ignoring air resistance and gravity's effect during tUsing the acceleration and mass of the Saturn V rocket at liftoff, what does the source saA Saturn V rocket has a liftoff mass of 2.80 times ten to the sixth kg, a fuel burn rate oAccording to the source, what is the practical limit on exhaust velocity for conventional,It is a common misconception that a rocket's exhaust pushes against the ground or the surr