check out this question

1.                             1.    A cubical box of edge 0.5-m flies past us at a speed of 0.80 c.  If one edge of the box is parallel to its motion, determine the volume of the box that we measure from the Earth

One)              0.025 m³      

Two)              0.045 m³        

Three)          0.027 m³          

Four)             0.125 m³      

Five)      0.075 m³

Twin Paradox- Concept which challenges common sense

1.    A and B are twin brothers of 10 year age.   A makes a round trip to a galaxy 100 Light years away with a speed of 0.85 C, while B remains on the earth.  What is the age difference between A and B when they meet again?