From corner A of a square raft, a dog jumped into the water and swam around the raft. Draw the dog's trajectory relative to the shore if it is swimming along the sides of the raft, and its speed relative to the water is \frac{4}{3} of the speed of the river current.

Solutions of Savchenko Problems in Physics

Aliaksandr Melnichenka
October 2023

    <h3 id="back-link"><a href="/#1.4">$\leftarrow$Back</a></h3>

    <h3> Statement </h3>
    <p>
        $1.4.4.$ From corner $A$ of a square raft, a dog jumped into the water and swam around the raft. Draw the dog's trajectory relative to the shore if it is swimming along the sides of the raft, and its speed relative to the water is $\frac{4}{3}$ of the speed of the river current.

    <h3>Solution</h3>
    <p>
        <p >

Let's consider the dog's movement relative to the shore

On segment $AB$ the dog swims $4\\, m$ vertically and is washed away $3\\, m$ horizontally.

Next, on $BC$ the dog swims $4\\, m$ horizontally along the river current and is washed away $3\\, m$ in the same direction.

On $CD$ the dog swims $4\\, m$ vertically, but in a different direction, and is again washed away $3\\, m$ along the river current.

On the last segment, the dog swims against the river current for $4\\, m$, and the river washes away for $3\\, m$, making a total movement of $1\\, m$ against the river current.

    <h4>Answer</h4>
    <p>
        <a href="#ans">See figure</a></h3>
    </p>


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