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Old Jul 27th 2018, 07:55 AM   #1
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Find the velocity of the rain drops with respect to the man?

Q. A man is walking on a level road at a speed of 3.0 km/h. Raindrops fall vertically at a speed of 4.0 km/h. Find the velocity of the raindrops with respect to the man,
A. The explanation is below:
Here I don't understand the diagram. Why the resultant vector left downward is between -v man.street and v rain.street? what does '-v man.street' denote on the diagram?
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Old Jul 27th 2018, 08:52 PM   #2
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The diagram is slightly confusing , I wouldn't worry about it ...

The main point is we have rain falling 4km/hr ... at right angles to the man walking at 3km/hr ... a 3:4:5 right angled triangle ,the man feels the rain hitting his face at 5K/hr
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Old Jul 27th 2018, 10:26 PM   #3
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Originally Posted by oz93666 View Post
The diagram is slightly confusing , I wouldn't worry about it ...

The main point is we have rain falling 4km/hr ... at right angles to the man walking at 3km/hr ... a 3:4:5 right angled triangle ,the man feels the rain hitting his face at 5K/hr
Could you show me which triangle shows 3:4:5 in the diagram?
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Old Jul 28th 2018, 02:26 AM   #4
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Originally Posted by Indranil View Post
Could you show me which triangle shows 3:4:5 in the diagram?
We have the triangle with the angle theta indicated .....the side going strait down represents the rain velocity 4.... the side going at an angle is 5 the velocity the man sees ... the side of the triangle horizontal is 3 and represents the man's speed.
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