The spaceship lilac, based on the purple planet, is 717 m717 m long, as measured at rest. when lilac passes earth, observers there measure its length to be 655 m655 m . at what fraction of the speed of light is lilac moving with respect to earth?

The graph below represents the work done by a student while running up flights of stairs. determine the student's power output after 10 seconds: 1600 j/s 8000 j/s 160 j/s 800 j/s

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?