# Helicopters rotor blades, could spin at high speed of 440 rpm. Find the angular displacement in radian for 1 hour(s) operation.?

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- oldschoolLv 72 months ago
This is a dimensional analysis exercise. Arrange or orient the conversion factors so that the units are correct. You want radians. You have radians/min and 1 hour:

440 rev/min * 60min/hr * 1hr * 2π rad/rev = 165,876 radians or about

166,000 radians

- billrussell42Lv 72 months ago
440 rev/min x 1 hr x 60 min/hr x 2π rad/rev = 166000 rad

or

440 rev/min x 1 hr x 60 min/hr x 360º/rev = 9504000º

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