Rotation with Constant Rotational Acceleration regarding a disk...?

Question

A disk rotates about its central axis starting from rest and accelerates with constant rotational acceleration. At one time it is rotating at 10 rev/s; 60 revolutions later, its rotational speed is 15 rev/s. Calculate (a) the rotational acceleration, (b) the time required to complete the 60 revolutions, (c) the time required to reach the 10 rev/s rotational speed, and finally (d) the number of revolutions from rest until the time the disk reaches the 10 rev/s rotational speed. What equations would you use, and can you explain your answer?

Answer 1

a) The disk increased from 10 rev/s to 15 rev/s. Acceleration was constant so the average speed was 12.5 rev/s. At that average speed, how many seconds did it take to make 60 revs?
60 revs * 1 s/12.5 revs = 4.8 seconds. Round to 5 seconds.

Therefore the acceleration was
(delta rev/s) / (delta time) = (5 rev/s) / 5 s = 1.0 rev/s^2

b) See above, that was 5 seconds

c) An acceleration of 1 rev/s^2 means each second the speed increases 1 rev/s. So it took 10 seconds to reach 10 rev/s.

d) The average speed from start to the time speed reached 10 rev/s was 5 rev/s. In 10 seconds at that speed it would make 50 revolutions.

Answer 2

there is not any relation yet between rotational acceleration and velocity,you`ll discover no formula for this... so,in case you have a difficulty,you`ll attain a lifeless end... there is acceleration for consistent velocity,through fact velocity it`s changing direction,that`s the difficulty.... often for consistent velocity acceleration is 0,yet not in rotational circulate so,if an merchandise has a continuing rotational acceleration,you are able to not say the way it`s his velocity,consistent or not