Question

astronaut has a heart rate of 65 beats/min at rest . what is the heart rate when space ship moves at speed 0.6c

Answer 1

Each heartbeat takes :

1/65 min

This is equal to :

Δt₀ = 1/65

Δt = (Δt₀) / √(1 - v²/c²)

Doing the substitution:

Δt = (1/65) / √(1 - (0.6)²

= 0.015385 / √0.64

= 0.015385 / 0.8 = 0.019231

= 0.019231 min/beat

To get beats per minute we get the reciprocal.

= 1/0.019231 = 51.999

= 52 beats per second