1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
blagie [28]
3 years ago
5

Squids propel themselves by expelling water. They do this by keeping water in a cavity and then suddenly contracting the cavity

to force out the water through an opening. A 9 kg squid (including the water in the cavity) at rest suddenly sees a dangerous predator. If the squid expels 2 kg of water out of its body with a speed of 8 m/s, what would be its own escape speed
Physics
1 answer:
Musya8 [376]3 years ago
8 0

Answer:

v_squid = - 2,286 m / s

Explanation:

This exercise can be solved using conservation of the moment, the system is made up of the squid plus the water inside, therefore the force to expel the water is an internal force and the moment is conserved.

Initial moment. Before expelling the water

          p₀ = 0

the squid is at rest

Final moment. After expelling the water

         p_{f} = M V_squid + m v_water

         p₀ = p_{f}

          0 = M V_squid + m v_water

           c_squid = -m v_water / M

The mass of the squid without water is

            M = 9 -2 = 7 kg

let's calculate

           v_squid = 2 8/7

           v_squid = - 2,286 m / s

The negative sign indicates that the squid is moving in the opposite direction of the water

You might be interested in
Mr. hitch taught us about sedimentary, metamorphic, and igneous rocks. he described how they were formed, what they contain, and
Tems11 [23]
Mr. Hitch taught us about sedimentary, metamorphic, and igneous rocks. He described how they were formed, what they contain, and showed us samples of each. He is a good geologist. 

The missing word and answer is: geologist.
3 0
2 years ago
Electricity that comes into our homes from the grid is known as:
il63 [147K]
Power grid
All the poles and wires you see along the highway and in front of your house are called the electrical transmission and distribution system. Today, generating stations all across the country are connected to each other through the electrical system (sometimes called the "power grid").
7 0
2 years ago
Would it be m/s or kg?
Nesterboy [21]

Answer:

m.s

Explanation:

3 0
2 years ago
At takeoff, a commercial jet has a speed of 72 m/s. Its tires have a diameter of 0.89 m. Part (a) At how many rev/min are the ti
34kurt

Answer:

a) Revolutions per minute = 2.33

b) Centripetal acceleration = 11649.44 m/s²

Explanation:

a) Angular velocity is the ratio of linear velocity and radius.

Here linear velocity = 72 m/s

Radius, r  = 0.89 x 0. 5 = 0.445 m

Angular velocity

         \omega =\frac{72}{0.445}=161.8rad/s

Frequency

         f=\frac{2\pi}{\omega}=\frac{2\times \pi}{161.8}=0.0388rev/s=2.33rev/min

Revolutions per minute = 2.33

b) Centripetal acceleration

               a=\frac{v^2}{r}

  Here linear velocity = 72 m/s

  Radius, r  = 0.445 m

Substituting

   a=\frac{72^2}{0.445}=11649.44m/s^2

Centripetal acceleration = 11649.44m/s²

6 0
2 years ago
explain how metamorphic rocks are formed, and explain the differences between regional and contact metamorphism?
Igoryamba
Metamorphic rocks form when pre-existing or parent rocks (whether igneous, sedimentary, or even metamorphic) are altered by heat, pressure, and the chemical activity of fluids. When the dominant altering factor is heat, usually  from direct contact , it may undergo fundamental change  in texture and recrystallization is called contact metamorphism. While regional metamorphism,  where rocks texture and minerals are changed by heat and pressure.
5 0
3 years ago
Other questions:
  • Ajar can hold 60 mL of liquid. It is 10 cm high and 2 cm wide. The length of the jar is:
    12·2 answers
  • A current of 0.5A flows in a circuit. Determine the quantity of charge that crosses a point in 4 minutes
    13·1 answer
  • What is the shape of a projectile
    15·1 answer
  • If the seafloor is spreading why isn't earth getting bigger?
    9·1 answer
  • Which of the following shows kinetic energy being converted into potential energy?
    12·1 answer
  • True or false? A proton carries a positive charge.
    7·1 answer
  • Solutions to environmental problems ________.
    14·1 answer
  • A passenger in a car moving at a 40 m/s is not moving when which frame reference is used?
    6·1 answer
  • Which object would have the greatest acceleration?
    7·1 answer
  • Nikki has a momentum of 45 Kilogram meters per second and a mass of 30 Kilograms. What is her velocity?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!