An astronaut at rest has a heart rate of 65 beats/min. What will ...

[xclash]

An astronaut at rest has a heart rate of 65 beats/min. What will her heart rate be as measured by an earth observer when the astronaut's spaceship goes by the earth at a speed of 0.80c?
 a. 108 beats/min
  c. 81 beats/min
  b. 39 beats/min
  d. 52 beats/min

Question 2

A ground observer measures the period of a pendulum moving as a part of an inertial frame of reference to be 2.30 s as the inertial frame moves by at a velocity of 0.800c. What would the observed period be of the same pendulum if its inertial frame were at rest with respect to the observer?
 a. 3.03 s
  c. 1.84 s
  b. 1.38 s
  d. 4.25 s

[macmac]

Answer to Question 1

B

Answer to Question 2

B

[xclash]

Thanks for the timely response, appreciate it

[cpetit11]

Excellent