1. The period of a pendulum attached in a spaceship is 2 s while the spaceship is parked on Earth. What is the period to an observer on Earth when the spaceship moves at 0.6c with respect to the Earth?
(a) Less than 2 s.
(b) More than 2 s.
(c) 2 s.
2. Two spaceships, each moving at a speed 0.75c relative to the Earth, are headed directly toward each other. What do occupants of one ship measure the speed of other ship to be?
(a) 0.96c.
(b) 1.0c.
(c) 1.5c.
(d) 1.75c.
(e) 0.75c.