SATHEE: Kinematics Question 521

Kinematics Question 521

Question: A person walks at the rate of $3 k m / h r$ . Rain appears to him in vertical direction at the rate of $3 \sqrt{3} k m / h r$ . Find the magnitude and direction of true velocity of rain.

Options:

A) $6 k m / h r$ , inclined at an angle of $45^{\circ}$ to the vertical towards the person’s motion.

B) $3 k m / h r$ , inclined at an angle of $30^{\circ}$ to the vertical towards the person’s motion.

C) $6 k m / h r$ , inclined at an angle of $30^{\circ}$ to the vertical towards the person’s motion.

D) $6 k m / h r$ , inclined at an angle of $60^{\circ}$ to the vertical towards the person’s motion.

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Answer:

Correct Answer: C

Solution:

[c] ${\vec{v}}_{r / m} = {\vec{v}}_{r} - {\vec{v}}_{m}$

${\vec{v}}_{r} = {\vec{v}}_{r / m} + {\vec{v}}_{m}$

$| {\vec{v}}_{r} | = \sqrt{v_{r / m}^{2} + v_{m}^{2}}$

$= \sqrt{{(3)}^{2} + {(3 \sqrt{3})}^{2}} = 6 k m / h r$

$\tan θ = \frac{3}{3 \sqrt{3}} = \frac{1}{\sqrt{3}} \Rightarrow θ = 30^{\circ}$

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Kinematics Question 521

Question: A person walks at the rate of $3 k m / h r$ . Rain appears to him in vertical direction at the rate of $3 \sqrt{3} k m / h r$ . Find the magnitude and direction of true velocity of rain.

Options:

Answer:

Solution:

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 Question 521

Question: A person walks at the rate of 3km/hr . Rain appears to him in vertical direction at the rate of 33km/hr . Find the magnitude and direction of true velocity of rain.

Options:

Answer:

Solution:

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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Question: A person walks at the rate of $3 k m / h r$ . Rain appears to him in vertical direction at the rate of $3 \sqrt{3} k m / h r$ . Find the magnitude and direction of true velocity of rain.