Welcome to College Confidential!

The leading college-bound community on the web

Sign Up For Free

Join for FREE, and start talking with other members, weighing in on community discussions, and more.

Also, by registering and logging in you'll see fewer ads and pesky welcome messages (like this one!)

As a CC member, you can:

  • Reply to threads, and start your own.
  • Post reviews of your campus visits.
  • Find hundreds of pages of informative articles.
  • Search from over 3 million scholarships.

SAT physics question

Basketboy09Basketboy09 Registered User Posts: 16 New Member

Two identical, human looking robots are standing and facing forward in separate spaceships. Both ships are moving at 0.8c but are travelling in opposite directions, as shown above. (apologies for not being able to provide diagram, you can find the exact question with diagram here: http://ttlearning.com/wp-content/uploads/2013/05/Magazine_May2013-web-eng.pdf) If a person on the spaceship with robot A could make measurements on both robots, which of the following would the person observe to be different.
A) the robots' heights
B) the length of the robots' feet from toe to heel
C) the width of the robots' faces
D) The length of the robot's legs
E) the width of the robot's shoulders

Please help?

Replies to: SAT physics question

  • BigIsBigIs Registered User Posts: 1,057 Senior Member
    B. It is the only dimension moving towards the observing robot. It will appear to be shorter. All the other dimensions remain the same. Of course, if the robot lies down head towards the observer, A, and D are correct. If the robot turns sideways to the observer, C and E are correct.
This discussion has been closed.