Mar 28th 2017, 11:33 AM
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Junior Member
Join Date: Mar 2017
Posts: 9
| Q24, specimen paper 1
24) The diagram shows the turbine of a wind generator. The tip of one blade moves in a circle of diameter 64.0 m.
The rotor blades make 300 revolutions per hour.
What is the centripetal acceleration of the tip of the rotor blades?
A 0.26 ms^–2 B 4.39 ms^–2 ---> correct answer
C 17.5 ms^–2
D 1.58×104 ms^–2
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My working out: r = 32 m, T = (60*60)/300 = 12 secs, ω = 2π/12 = π/6
a = v^2/r = (rw)^2/32 = (16/3π^2)/32 = 8.77 ------> which is 2*(B)
Last edited by akra99; Mar 28th 2017 at 02:01 PM.
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