Physics, asked by Naidubabu8342, 9 months ago

The stream of river is flowing with a speed of 2 km/h. A swimmer can swim at a speed of 4km/h What shouldde me direction of the swimmer with respect to the flow of the river to cross the river straight?(1) 90(2) 120(3) 60(4) 150​

Answers

Answered by Anonymous
1

\color{darkblue}\underline{\underline{\sf Given-}}

  • River speed = 2km/h
  • Swimmer speed = 4km/h

\color{darkblue}\underline{\underline{\sf To \: Find-}}

  • Direction of swimmer with respect to the flow to river to cross the river straight

━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Swimmer to cross the river -

\implies{\sf v_s\:sin\theta=v_r }

\implies{\sf 4\:sin\theta=2}

\implies{\sf sin\theta=\dfrac{1}{2}}

\color{red}\implies{\sf \theta=30° }

Direction of swimmer with respect to the flow to river to cross the river straight

\implies{\sf 90°+30°}

\color{red}\implies{\sf 120°}

\color{darkblue}\underline{\underline{\sf Answer-}}

Option (2) 120°

Direction of swimmer with respect to the flow to river to cross the river straight is \color{red}{\sf 120°}.

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