To outside observers at rest, the overall sizes of objects ...

[Beheh]

To outside observers at rest, the overall sizes of objects traveling at relativistic speeds are
 
  A) larger.
  B) smaller.
  C) the same size.

Question 2

An astronaut traveling forward at 0.87c holds a meterstick in spear-like fashion. An observer at rest sees the spear's length as
 
  A) 0.5 m.
  B) 0.87 m.
  C) 1 m.
  D) 1.25 m.
  E) 1.5 m.

Question 3

The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of 44 g/mole is 396 m/s. What is the rms speed of water molecules, with a molecular weight of 18 g/mol at the same temperature?
 
  A) 253 m/s
  B) 387 m/s
  C) 421 m/s
  D) 506 m/s
  E) 619 m/s

[anyusername12131]

Answer to Question 1

Answer: B

Answer to Question 2

Posted another one can you check that one too? Thanks.

Answer to Question 3

E

[Beheh]

Wow, this really help

[rachel]

Great answer, keep it coming