Question

Squids and octopuses propel themselves by expelling water. They do this by taking the water into a
cavity and then suddenly contracting the cavity, forcing the water to shoot out of an opening. A 6.50
daN squid (including the water in the cavity) that is at rest suddenly sees a dangerous predator.
(a) If this squid has 1.75 kg of water in its cavity, at what speed must it expel the water to suddenly
achieve a speed of 2.50 m/s to escape the predator? Neglect any drag effects of the surrounding
water.
(b) How much kinetic energy does the squid create for this escape maneuver?

Answer 1

The answers are:
a)6.79 m/s
b) 55.2J

Not too sure on how to get these answers!!Please Help!

Answer 2

what is most likely explanation for why the shang had little interaction with non-chinese cultures

Answer 3

to use conservation of momentum you must know all masses and speeds

This :::::

" cavity and then suddenly contracting the cavity, forcing the water to shoot out of an opening. A 6.50
daN squid (including the water in the cavity) that is at rest suddenly sees a dangerous predator.
..."

Is gibberish