Find the velocity of the rain drops with respect to the man?

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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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  • #2
phinds
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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 do you think?
what does '-v man.street' denote on the diagram?
What does a minus sign mean on ANY vector diagram that is oriented with the +x direction as the positive vector direction?
 
  • #3
anorlunda
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what does '-v man.street' denote on the diagram?

The horizontal component of the rain relative to the man.

If +velocity is to the right (the direction of the man's walk), then the horizontal component of rain relative to the man is in the opposite direction; minus.
 
  • #4
phinds
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Whatever happened to the Socratic Method, as opposed to just spoon-feeding the answer?
 
  • #5
anorlunda
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Whatever happened to the Socratic Method, as opposed to just spoon-feeding the answer?
Whoops. You're right.
 

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