Physics Help Forum Find the velocity of the rain drops with respect to the man?

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Jul 27th 2018, 07:55 AM #1 Junior Member   Join Date: Jul 2018 Posts: 14 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? Attached Thumbnails
 Jul 27th 2018, 08:52 PM #2 Senior Member   Join Date: Apr 2017 Posts: 477 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
Jul 27th 2018, 10:26 PM   #3
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Join Date: Jul 2018
Posts: 14
 Originally Posted by oz93666 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?

Jul 28th 2018, 02:26 AM   #4
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Join Date: Apr 2017
Posts: 477
 Originally Posted by Indranil 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.

 Tags drops, find, man, rain, respect, velocity

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