A science museum designs an experiment to show the fall of a feather in a vertical glass vacuum tube. The time of fall from test is too close to 0.5 s. What length of tube is required?
Correct answer: A. 1.3 m
- A. 1.3 m
- B. 2.5 m
- C. 5.0 m
- D. 10.0 m
Explanation
We must calculate the length of the tube, i.e distance traveled by the feather. We can use the formula for linear motion s = ut + 1/2at2. We have been provided with:The feather falls from rest thus initial velocity u = 0Acceleration is the acceleration of free fall = 9.81Time taken = 0.5 sS = 0 + ½ (9.81)(0.5)2 = 1.226 = 1.3
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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About Acceleration
Acceleration measures the rate at which velocity changes with time, including changes in speed, direction or both. Work includes average and instantaneous acceleration, the relation a = Δv/Δt, uniform acceleration equations, and interpreting velocity time and displacement time graphs, with acceleration carefully distinguished from velocity.
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