Author Question: Einstein's Relativity seems to say that, if Mort and Velma are twins and Velma goes on a trip and ... (Read 89 times)

dalyningkenk · **on:** Jul 29, 2018

Einstein's Relativity seems to say that, if Mort and Velma are twins and Velma goes on a trip and then returns, Velma will then be younger than Mort and Mort will be younger than Velma. What is wrong with this reasoning?

A) Nothing is wrong with it.
B) The prediction about Velma's observation is not correct, because Velma is accelerated.
C) The effects of the theory of relativity cancel out due to Velma's acceleration, so that they are both really the same age when they get back together.
D) The prediction about Mort's observation is not correct, because Velma is accelerated.
E) What's wrong with this reasoning is that Albert Einstein was a fool and a hothead.

Question 2

An old 78 rpm record rotates through an angle of 320 as it slows down uniformly from 78.0 rpm to 22.8 rpm. What is the magnitude of the angular acceleration of the record?

A) 2.34 rad/s2
B) 5.46 rad/s2
C) 6.50 rad/s2
D) 8.35 rad/s2
E) 10.9 rad/s2