An ordinary workshop grindstone has a radius of 7.50 cm and rotates at 6500 rev/min. (a) calculate the magnitude of the centripetal acceleration at its edge in meters per second squared and convert it to multiples of g . (b) what is the linear speed of a point on its edge

To solve this problem it is necessary to apply the concepts related to the relationship between tangential velocity and centripetal velocity, as well as the kinematic equations of angular motion. By definition we know that the direction of centripetal acceleration is perpendicular to the direction of tangential velocity, therefore:

Where,

V = the linear speed

r = Radius

Angular speed

The angular speed is given by

Replacing at our first equation we have that the centripetal acceleration would be

To transform it into multiples of the earth's gravity which is given as the equivalent of 1g.

PART B) Now the linear speed would be subject to:

Therefore the linear speed of a point on its edge is 51.05m/s

a coal burning power plant

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer