A helicopter blade starts to rotate from rest with a constant angular acceleration of \alpha=\:α = 0.98 radians/second2. How many revolutions will the blade make before it is rotating at 500 revolutions per minute (RPM)?

n = 223 revolutions

Explanation:

It is given that,

The angular acceleration of a helicopter blade,

Initial speed of the helicopter blade,

The final speed of the blade,

We need to find the number of revolutions. Firstly we will find the angle turned by the blade. Let the angle is . So,

Let there are n number of revolutions made by the blade. So,

or

n = 223 rev

So, there are 223 revolutions.

b.a device that inputs heat into a cool object