An airplane propeller rotates at 1050 rev/min while the airplane flies at a speed of 510 km/h relative to the ground. The plane's velocity is parallel to the propeller's axis of rotation.
What is the linear speed of a point on the tip of the propeller, at radius 1.5 m, as seen by (a) the pilot and (b) an observer on the ground?

Explanation:

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found in the nucleus

has mass of one amu

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )