Bob is in a spaceship going by you at 90% of the speed of light,but in an upright standing position.Bob measures his mass to be 50 kg,his height to be 2.0 meters,and his waist size to be 80 cm.What would you say about his measurements?
A)His mass is more than 50 kg,his height is still 2.0 meters,and his waist size is less than 80 cm.
B)His mass is more than 50 kg,his height is less than 2.0 meters,and his waist size is less than 80 cm.
C)His mass is less than 50 kg,his height is more 2.0 meters,and his waist size is less than 80 cm.
D)You would measure the same mass and size as he does.

Question

Quizplus · Accepted Answer

According to the theory of relativity, as an object approaches the speed of light, its mass will increase. Therefore, Bob's mass would be more than 50 kg from your perspective. However, his height and waist size should remain the same as they are not affected by his velocity.

Bob Is in a Spaceship Going by You at 90