SATHEE: Kinematics 3 Question 1

Kinematics 3 Question 1

1. The stream of a river is flowing with a speed of $2 k m / h$ . A swimmer can swim at a speed of $4 k m / h$ . What should be the direction of the swimmer with respect to the flow of the river to cross the river straight?

(2019 Main, 9 April I)

(a) $60^{\circ}$

(b) $120^{\circ}$

(d) $150^{\circ}$

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Answer:

Correct Answer: 1. (b)

Solution:

Let the velocity of the swimmer is $v_{s} = 4 k m / h$ and velocity of river is $v_{r} = 2 k m / h$

Also, angle of swimmer with the flow of the river (down stream) is $α$ as shown in the figure below

From diagram, angle $θ$ is

$\begin{aligned} \sin θ & = \frac{v_{r}}{v_{s r}} = \frac{2 k m / h}{4 k m / h} = \frac{1}{2} \Rightarrow θ = 30^{\circ} \\ Clearly, α & = 90^{\circ} + 30^{\circ} = 120^{\circ} \end{aligned}$

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Kinematics 3 Question 1

1. The stream of a river is flowing with a speed of $2 k m / h$ . A swimmer can swim at a speed of $4 k m / h$ . What should be the direction of the swimmer with respect to the flow of the river to cross the river straight?

Answer:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

Kinematics 3 Question 1

1. The stream of a river is flowing with a speed of 2km/h. A swimmer can swim at a speed of 4km/h. What should be the direction of the swimmer with respect to the flow of the river to cross the river straight?

Answer:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

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1. The stream of a river is flowing with a speed of $2 k m / h$ . A swimmer can swim at a speed of $4 k m / h$ . What should be the direction of the swimmer with respect to the flow of the river to cross the river straight?