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fiasKO [112]
2 years ago
15

a snail takes 16 minutes 40 seconds to cover a distance of 1 m calculate the average speed of the swimmer​

Physics
2 answers:
matrenka [14]2 years ago
8 0
The snail’s speed is 0.001042. Hope this helps!

77julia77 [94]2 years ago
5 0
<h2>Answer: </h2>

<u><em>1 cm per 10 seconds </em></u>

<h2>Explanation: </h2>

<em>16 minutes and 40 seconds is 1000 seconds so take the 1 meter turn it into 100 centimeters then divide both sides by 100 and you get your answer which is </em><u><em>1 centimeter every 10 seconds.</em></u>

<em />

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True or false?
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1. False

Explanation: it's exactly the opposite. In fact, Lenz's law states that the induced current and the induced emf in a conductor are generated in such a direction that opposes to the change in magnetic flux through the coil. This is summarized by the negative sign in the Faraday's Newmann Lenz law:

\epsilon= -\frac{d\Phi }{dt}

where \epsilon is the emf induced and \frac{d\Phi}{dt} is the rate of change of magnetic flux through the coil.

Lenz's law is a consequence of the law of conservation of energy. In fact, we have:

- If the magnetic flux through a coil is increasing, then the induced current has a direction such that the magnetic field generated by the coil is opposite to the direction of the external magnetic field, in order to decrease the total flux

- If the magnetic flux through a coil is decreasing, then the induced current has a direction such that the magnetic field generated by the coil is in the same direction as the external field, in order to increase the total flux

2. False

Explanation: the magnetic flux through a surface is given by

\Phi = BA cos \theta

where

B is the magnitude of the magnetic field

A is the surface area

\theta is the angle between the direction of B and the normal vector to the surface

As we see, the magnetic flux depends not only on B and A, but also on the orientation of the coil with respect to the magnetic field.

3. False

Explanation:

- Sound waves are mechanical waves: mechanical waves are waves consisting of oscillations of the particles in a medium. Due to their nature, therefore, mechanical waves can propagate only in the presence of a medium

- Electromagnetic waves are NOT mechanical waves: they consist of oscillations of electric and magnetic fields, in a direction perpendicular to the direction of propagation of the wave. Since em waves are not mechanical waves, they do NOT need a medium to propagate, since they can also travel through a vacuum; therefore the original statement is false.

5 0
2 years ago
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