The engineer determines that the machine increased at a constant rate the disk’s angular speed from 100 rad/s to 300 rad/s over a time of 5 seconds. what was the angular displacement of the disk during those 5 seconds?

The disk's average angular speed during those 5 seconds was

(1/2) (100 + 300) rad/s = 200 rad/sec

Spinning for 5 sec at an average angular speed of 200 rad/s, the disk turned

(200 rad/s) x (5 s)  =  1,000 radians

(That's 500/pi revolutions = roughly 159.2 revolutions.)

i guess it’s a and b

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

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