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# Helicopters rotor blades could spin at high speed of 400 rpm. Find the angular displacement in radians for 7 hours operation.

The rotor blades spin at 400 revolutions per minute. So, in seven hours, the blades perform ﻿﻿ revolutions.

Since one revolution is ﻿﻿ radians, we can deduce the angular displacement of the blades : ﻿﻿ radians.

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