Which changes to observed time and length occur when objects approach the speed of light?
time moves slower and length increases.
time moves slower and length decreases.
time moves faster and length increases.
time moves faster and length decreases.

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.

Explain why you think this diagram shows what happened to the carbon in the biodome.