Carry out the following conversions using the factor-label method. show all your work.
1. how many seconds are in a year (365 days)?
2. how many centimeters are in 0.14 m?
3. how many kilograms are in 20 grams?
4. how many meters are in 637 nanometers?
5. how many meters are in 3.2 kilometers?
6. how many meters are in 24.0 micrometers?

If a clock aboard a space ship traveling at 0.900 c of the speed of light relative to earth chimes once at the beginning of the hour and again when it reads one hour later, how much time would an observer on earth say elapsed between the two chimes?

Apassenger walks toward the rear of a moving train. describe her motion as seen from a reference point on the train. then describe it from a reference point on the ground

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve