Huck Finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft's motion relative to the shore). The raft is traveling down the Mississippi River at a speed of 1.41 m/s relative to the river bank (see the figure ).


What is Huck's velocity (speed and direction) relative to the river bank? ______m/s

Angle from the right horizontal direction ____

Respuesta :

Answer

given,

speed of huck walk = 0.6 m/s

speed of raft on Mississippi river = 1.41 m/s

hunk velocity relative to the river bank

[tex]V_{hR} = \sqrt{V_{h}^2+V_{raft}^2}[/tex]

[tex]V_{hR} = \sqrt{0.6^2+1.41}^2}[/tex]

[tex]V_{hR} = \sqrt{2.3481}[/tex]

[tex]V_{hR} = 1.53\ m/s[/tex]

angle made with horizontal

huck move perpendicular to the shaft

[tex]\theta = tan^{-1}(\dfrac{y}{x})[/tex]

[tex]\theta = tan^{-1}(\dfrac{0.6}{1.41})[/tex]

[tex]\theta = tan^{-1}(0.426)[/tex]

θ = 23.05°

Huck's velocity relative to the river bank is [tex]1.53m/s[/tex]

The Angle from the right horizontal direction is [tex]23.05[/tex] degrees.

Resultant velocity:

Given that, Huck Finn speed is [tex]0.60 m/s[/tex] across his raft.

and the raft is traveling with speed of [tex]1.41m/s .[/tex]

So that, [tex]V_{h}=0.6m/s,V_{r}=1.41m/s[/tex]

Let us consider that Huck's velocity relative to the river bank is [tex]V_{hr}[/tex].

           [tex]V_{hr}=\sqrt{V_{h}^{2}+V_{r}^{2} }\\ \\V_{hr}=\sqrt{(0.6)^{2}+(1.41)^{2} } \\\\V_{hr}=\sqrt{2.348} \\\\V_{hr}=1.53m/s[/tex]

Angle from the right horizontal direction is,

               [tex]\theta=tan^{-1}(\frac{0.6}{1.41} ) \\\\\theta=tan^{-1}(0.426)\\\\\theta=23.05degrees[/tex]

Learn more about the relative velocity here:

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