Velocity of fly relative to train tracks

In summary, the fly is crawling north across the waiter at 3.0mi/hr. The velocity of the fly relative to the tracks is 3.0mi/hr.
  • #1
drumbum
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Homework Statement


A train is moving eastward at 60.0mi/hr. A waiter is walking westward at 2.0mi/hr. A fly is crawling north across the waiter at 3.0mi/hr. What is the velocity of the fly relative to the tracks?




The Attempt at a Solution


I don't understand what it means by the fly is crawling ACROSS the waiter. And how I can find out the velocity relative to the tracks.
 
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  • #2
Maybe you are having trouble visualizing it. The waiter is on the train and the fly is on the waiter. Imagine the waiter walking around in the train carrying a large plate of food and the fly is crawling across the plate.

Once you visualize it draw out the vectors and add them up
 
  • #3
I still don't understand how I would draw it. I draw the 60 mi/hr one, being the train. The head is going to the left. But where is the waiter standing?? Is her tail touching the trains tail??

Thank you so much.
 
  • #4
Ok, one way to draw it. You draw the train arrow as you stated. Then you draw the waiter arrow with her tail starting on the head of the train arrow (you will trace back over the train arrow that is ok). Try to draw the arrow sizes relative to one another (the train arrow should be much longer than waiter arrow). Then you draw the bug arrow with the tail starting at the head of the waiter arrow. Then you can make a net (relative) velocity arrow starting from the origin and pointing to the end of the bug arrow. The length of that arrow will the be the relative velocity. You will be able to solve for the length of the net arrow. Remember that the net velocity will have magnitude and direction.
 
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  • #5
Makes SOOO much more sense.

THANK YOU SO MUCH.
 

FAQ: Velocity of fly relative to train tracks

What is the velocity of a fly relative to train tracks?

The velocity of a fly relative to train tracks can vary greatly depending on the speed of the train and the direction that the fly is flying. However, it is generally accepted that a fly's velocity relative to the train tracks is equal to the velocity of the train plus the velocity of the fly in the opposite direction of the train's motion.

How is the velocity of a fly relative to train tracks measured?

The velocity of a fly relative to train tracks can be measured using a variety of methods, such as radar guns or tracking software. However, the most accurate way to measure it is by using a high-speed camera to capture the fly's movement in relation to the train tracks.

Does the size of the fly affect its velocity relative to train tracks?

Yes, the size of the fly can affect its velocity relative to train tracks. Smaller flies tend to have a higher velocity relative to train tracks due to their lighter weight and ability to fly faster. However, the difference in velocity may be negligible in practical scenarios.

Can the velocity of a fly relative to train tracks be negative?

Yes, the velocity of a fly relative to train tracks can be negative. This occurs when the fly is flying in the opposite direction of the train's motion, resulting in a negative value for its velocity relative to the train tracks.

How does wind affect the velocity of a fly relative to train tracks?

Wind can have a significant impact on the velocity of a fly relative to train tracks. If the wind is blowing in the same direction as the train's motion, it can increase the fly's velocity relative to the train tracks. However, if the wind is blowing in the opposite direction, it can decrease the fly's velocity relative to the train tracks.

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