A flywheel rotates at 7200 rpm when the power is suddenly cut off. The flywheel decelerates at a constant rate of 2.1 rad/s2 and comes to rest 5 min later. How many revolutions does the flywheel make before coming to rest?

20960.7 revolutions

Explanation:

Convert from revolutions-per-minute to angular speed (rad/s) knowing that each revolution has a 2π angle and each minute has 60 seconds

7200 rpm = 7200 (rev/min) * 2π (rad/rev) * (1/60) (min/sec) = 754 rad/s

We can use the following equation of motion to calculate the angle swept by the flywheel during the deceleration of t = 5 minute = 300 s

Again we can convert this to number of revolution

131700 rad * (1/2π) (rev/rad) = 20960.7 rev

explanation:

considering the bohr theory, the type of connection that requires the transfer the answer conuldn't be right

talk back to him about the sport and show him your expertise or leave the room