The answer is d I took the test
Answer:
(a) 8.362 rad/sec
(b) 6.815 m/sec
(c) 9.446 
(d) 396.22 revolution
Explanation:
We have given that diameter d = 1.63 m
So radius 
Angular speed N = 79.9 rev/min
(a) We know that angular speed in radian per sec

(b) We know that linear speed is given by

(c) We have given final angular velocity 
And 
Time t = 63 sec
Angular acceleration is given by 
(d) Change in angle is given by

There’s 10mm in a cm: 22mm
300 miles / 6 hours = 50 miles per hour
Use of electromagnetic because it moves very faster than others for example xrays theynar very very slow so that not It it is d.