Question

---- A centrifuge is a common laboratory instrument that separates components of differing densities in solution. This is accomplished by spinning a sample around in a circle with a large angular speed. Suppose that after a centrifuge in a medical laboratory is turned off, it continues to rotate with a constant angular deceleration for 10.7 s before coming to rest.

A) If its initial angular speed was 3830 rpm , what is the magnitude of its angular deceleration?

B) How many revolutions did the centrifuge complete after being turned off?

-----The hour hand on a certain clock is 9.3 cm long.

A) Find the tangential speed of the tip of this hand.

----- A Ferris wheel with a radius of 9.1 m rotates at a constant rate, completing one revolution every 38 s .
Suppose the Ferris wheel begins to decelerate at the rate of 0.21 rad/s2 when the passenger is at the top of the wheel.

A) Find the direction of the passenger's acceleration at that time.

Answer 1