Digital bits on a 12.0-cm diameter audio cd are encoded along an outward spiraling path that starts at radius r1=2.5cm and finishes at radius r2=5.8cm. the distance between the centers of neighboring spiral-windings is 1.6μm(=1.6×10−6m). part a determine the total length of the spiraling path. [hint: imagine "unwinding" the spiral into a straight path of width 1.6μm, and note that the original spiral and the straight path both occupy the same area.]

How much work would be needed to raise the payload from the surface of the moon (i.e., x = r) to an altitude of 5r miles above the surface of the moon (i.e., x = 6r)?

Most energy in an ecosystem comes originally from_

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.