Aspaceship is built to reach a star system 15 light-years away.

(a) how fast must the spaceship move (in units of c) so that the round trip time experienced by the crew is 20 years?

(b) how much time would the round trip take as measured by observers on earth?

The material that keeps its new shape after it is stretched is called?

In what direction does an applied force move an object

9. an object is moved from the outdoors, which is at a temperature of 100 ºf, to a room at a temperature of 70 º f. what happens to the object when it’s placed in the room with a lower temperature? the object gives off more energy than it absorbs until it reaches a new lower thermal equilibrium where the amount of energy absorbed and given off is the same. the object gives off the same amount of energy as it absorbs until it reaches a new lower thermal equilibrium where the amount of energy given off is greater than the amount of energy it absorbs. the object gives off more energy than it absorbs until it reaches a new higher thermal equilibrium where the amount of energy absorbed and given off is the same. the object absorbs more energy than it gives off until it reaches a new lower thermal equilibrium where the amount of energy absorbed and given off is the same.