The diagram shows changing wavelengths along the electromagnetic spectrum. which labels belong in the areas marked y and z? y: ultraviolet z: radio y: gamma rays z: visible light y: x-rays z: infrared y: radio z: gamma rays

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.