corkscrew: a physics problem
Post on 06-Jan-2016
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DESCRIPTIONAnika J ä ckel, Sherry Gu, and Jahnavi Singh. Corkscrew: A Physics Problem. The Problem. When standing thirty meters away, the top of the corkscrew is at an angle of 35° at an eye height of 172 centimetres. The train takes twenty seconds to reach the top. - PowerPoint PPT Presentation
Corkscrew:A Physics ProblemAnika Jckel, Sherry Gu, and Jahnavi Singh
The ProblemWhen standing thirty meters away, the top of the corkscrew is at an angle of 35 at an eye height of 172 centimetres
The train takes twenty seconds to reach the top.
Suppose the train weighs fifteen tonnes and the ride uses an engine with five hundred horse power to pull the train up.
What is the efficiency of the engine?
The Solutionh = dtan + heye heighth = (30) tan(35) + 1.72h = 21 + 1.72h = 22.7 m
Engine = 500 hp
t = 20s
m = 15 tonne 172cm3530 mhEfficiency = Wo x 100% WI
Efficiency = (15 000) (9.8) (22.7) x 100% (500) (746) (20)
Efficiency = 3 336 900 x 100% 7 460 000
Efficiency = 45%
The engine has an efficiency of 45%.
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