Light clock thought experiment

Antoine is a molecular exo-biologist on his way to a planet orbiting a star that is exactly 7 light years away from Earth to begin studying the suitability of the planet to support human life. He is eager to begin work as he says goodbye to his family and boards the spaceship for the long journey ahead…

After Antoine arrives at his destination he is anxious to get started but needs the additional supplies he ordered half way through his voyage before he can begin. What is the earliest he can expect the additional supplies to arrive?

Select one:

A. ABOUT 2.3 YEARS

B. MORE THAN 10 YEARS

C. 3 MILLION YEARS

D. FROM HIS POINT OF VIEW THE SUPPLIES WILL NEVER ARRIVE

Parker and Stan perform a simple experiment timing how long it takes a ball to drop while riding on a roller coaster and notice different results than when they perform the same experiments in the lab. What is the likely reason?

Select one:

A. ON THE ROLLER COASTER THEY DON’T HAVE AS GOOD EQUIPMENT AS IN THE LAB.

B. ON THE ROLLER COASTER THEY ARE UNDERGOING ACCELERATION AND NON-UNIFORM MOTION WITH RESPECT TO THE LAB.

C. THE ACCELERATION DUE TO GRAVITY ON THE ROLLER COASTER IS DIFFERENT THAN THE GRAVITY IN THE LAB.

D. ON THE ROLLER COASTER THEY HAVE TO DEAL WITH WIND RESISTANCE WHICH IS NOT A FACTOR IN THE LAB.

What of the following are challenges to deep space exploration at high velocity caused by relativistic considerations?

Select one:

A. STARS ARE SO CLOSE TOGETHER THAT THERE IS A GREAT RISK OF COLLISION.

B. FOOD, WATER AND AIR FOR AN EXTENDED VOYAGE WOULD NEED TO BE RECYCLED.

C. TIME WOULD PASS VERY DIFFERENTLY FOR THE EXPLORERS COMPARED TO PEOPLE BACK ON EARTH.

D. RADIATION HAZARDS IN THE INTERSTELLAR MEDIUM ARE RELATIVELY UNKNOWN.

Clock A and Clock B are synchronized and then Clock B is placed on a spaceship departing Earth at 80% the speed of light while Clock A stays on Earth. When the ship returns 10 years later and the clocks are compared, what is found?

Select one:

A. CLOCK A AND CLOCK B SHOW THE EXACT SAME TIME.

B. CLOCK A SHOWS MORE TIME HAS PASSED THAN CLOCK B.

C. CLOCK B SHOWS MORE TIME HAS PASSED THAN CLOCK A.

D. NEITHER CLOCK IS CORRECT.

Dan and Dave who are identical twins. Dan left on a trip to a different solar system in the year 3172 and returned in 3197. Dave remained at home on Earth. When reunited one twin is visibly older than the other. Which twin is older and what is the most logical reason?