An aircraft is travelling at a constant speed of 180 m s' in a horizontal circle of radius 20 km. A plumbline, attached to the roof of the cabin, settles at an angle ø to the vertical while the aircraft is turning. (a) Find the centripetal acceleration of the aircraft. (b) Name the forces which act on the bob of the plumbline, and draw a labelled diagram to show the directions of these forces, and of their resultant. (c) Find the angle ø.

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.