An observer moving with a light clock in a spaceship sees a light flash bouncing up and down between parallel mirrors in 1 nanosecond. An observer at rest outside the spaceship sees the same up-and-down flash in
A) 1 nanosecond also.
B) less than 1 nanosecond.
C) more than 1 nanosecond.
Question 2
An astronaut is orbiting a black hole with a mass of 2.0 1031 kg at a distance of 126 km from its center. The astronaut is positioned in the spacecraft so that his 0.10-kg cheeks are 0.050 m on either side of the orbital circle.
What is the net tidal force pulling his cheeks apart? G = 6.67 x 10-11 Nm2/kg2. A) 1,000 N
B) 2,000 N
C) 10,000 N
D) 20,000 N
E) 100,000 N