1. A futuristic spaceship flies past MARS with a speed of 0.66c relative to the surface of MARS. Inside the spaceship, a pendulum is swinging. Each swing takes 1.60 seconds as measured by an astronaut performing an experiment inside the spaceship. (a) How long will each swing take as measured by a technician at mission control on MARS watching that experiment? (b) Suppose a person on the spaceship measures a bench on the ship and finds the length to be L₁ = 3.50 m along the direction of motion. What would be the length of the bench to a technician at mission control on MARS?

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.