Answer to Question #168074 in Mechanics | Relativity for Roaa Mohamed

Question #168074

Moving walkways are often found in airports. One moving walkway carries passengers up an incline of 30°, A single passenger of mass 72 kg stands on the walkway. The speed of the walkway is 0.51ms−1. Show that the rate at which the walkway does work on the passenger is about 200W.


1
Expert's answer
2021-03-02T18:04:45-0500

The weight of the passenger is


W=mgW = mg

where m=72kgm = 72kg is they mass, and g=9.8N/kgg = 9.8N/kg is the gravitational acceleration. The component of the weight that acts along the walkway is:


Wa=WsinθW_a = W\sin \theta

where θ=30°\theta = 30\degree.

By definition, the power is:


P=WvP = Wv

where v=0.51m/sv = 0.51m/s is the speed of motion. Thus, obtain:


P=mgvsinθP=729.80.51sin30°180WP = mgv\sin\theta\\ P = 72\cdot 9.8\cdot 0.51\cdot \sin 30\degree \approx 180W

Answer. 180 W.


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Comments

Roaa Mohamed
03.03.21, 14:04

Thanks a lot !!

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