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Eduardwww [97]
3 years ago
10

American eels (Anguilla rostrata) are freshwater fish with long, slender bodies that we can treat as uniform cylinders 1.0 m lon

g and 10 cm in diameter. An eel compensates for its small jaw and teeth by holding onto prey with its mouth and then rapidly spinning its body around its long axis to tear off a piece of flesh. Eels have been recorded to spin at up to 14 revolutions per second when feeding in this way. Although this feeding method is costly in terms of energy, it allows the eel to feed on larger prey than it otherwise could. The eel has a certain amount of rotational kinetic energy when spinning at 14 spins per second. If it swam in a straight line instead, about how fast would the eel have to swim to have the same amount of kinetic energy as when it is spinning? (a) 0.5 m/s; (b) 0.7 m/s; (c) 3 m/s; (d) 5 m/s.
Physics
1 answer:
algol [13]3 years ago
5 0

Answer:

(c) 3 m/s;

Explanation:

Moment of inertia of the fish eels about its long body as axis

= 1/2 m R ² where m is mass of its body and R is radius of transverse cross section of body .

= 1/2 x m x (5 x 10⁻² )²

I  = 12.5 m x 10⁻⁴ kg m²

angular velocity of the eel

ω = 2 π n where n is revolution per second

=2 π n

= 2 π x 14

= 28π

Rotational kinetic energy

= 1/2 I ω²

= .5 x 12.5 m x 10⁻⁴  x(28π)²

= 4.8312m  J

To match this kinetic energy let eel requires to have linear velocity of V

1 / 2 m V² = 4.8312m

V = 3.10

or 3 m /s .

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The visible light portion of the electromagnetic spectrum is often subdivided into the colors of red, orange, yellow, green, blu
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<h3><u>Explanation:</u></h3>

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3 years ago
The block in the figure below has a mass of 5.1 kg and it rests on an incline of angle . You pull on the rope with a force F = 3
viktelen [127]

42.9°

Explanation:

Let's assume that the x-axis is aligned with the incline and the positive direction is up the incline. We can then apply Newton's 2nd law as follows:

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6 0
2 years ago
You connect five identical resistors in series to a battery whose EMF is 12.0 V and whose internal resistance is negligible. You
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Explanation:

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Answer:

The steps are outlined in the explanation below.

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