A crane lifts a 425 kg steel beam vertically upward a distance of ...

[chads108]

A crane lifts a 425 kg steel beam vertically upward a distance of 95m How much work does the crane do on the beam if the beam accelerates upward at 1.8 m/s2? Neglect frictional forces.
 
  A) 4.0  105 J B) 3.2  105 J C) 4.7  105 J D) 2.7  105J

Question 2

A centrifuge in a medical laboratory rotates at a rotational speed of 3600 rev/min. When switched off, it makes 50 complete turns at a constant angular acceleration before coming to rest.
 
  (a) What was the magnitude of the angular acceleration of the centrifuge as it slowed down?
  (d) How long did it take for the centrifuge to come to rest after being turned off?

[blakeserpa]

Answer to Question 1

C

Answer to Question 2

(a) 230 rad/s2 (b) 1.7 s

[chads108]

Excellent

[helenmarkerine]

TYSM