A star is 21.6 light years from earth. How long would it take a spacecraft traveling 0.950c to reach that star as measured by observers?a. On earth (seconds)b Wn the spacecraft (seconds)c. what is the distance traveled according to observers on the spacecraft (meters)d. what will the spacecraft occupants compute their speed to be from the results of b and c?

If this plastic cup is heated to its melting point, what will eventually happen to all the particles in the plastic? a. the particles will begin to move enough that they slide past each other. b. bonds will form and the liquid will become a solid. c. the spaces between the particles will get smaller. d. the particles will change state and become a crystalline solid.

Rosa records the distance that a toy car rolls and the time it takes to cover the distance. what scientific practice is this? collecting data asking a question providing explanations communicating results

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?