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24-09-2017
Mathematics

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I don’t understand number 89! please help I have a test tomorrow!

I dont understand number 89 please help I have a test tomorrow class=

Respuesta :

24-09-2017

v = rw

where; v = velocity , r = radius , w = angular speed

you're given the diameter = 0.5 miles so the radius = 0.25 miles

180 = (0.25)w
180/0.25 = w
720 radians per hour = w

2pi radians in 1 revolution

720 rad/hr * 1 rev / 2pi rad = 720/2pi rev/hr
= 114.6 rev/hr

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