Astronaut is traveling in a space vehicle moving at 0.510c relative to the earth. the astronaut measures her pulse rate at 61.0 beats per minute. signals generated by the astronaut's pulse are radioed to the earth when the vehicle is moving in a direction perpendicular to the line that connects the vehicle with an observer on the earth. (due to vehicle's path there will be no doppler shift in the signal.) what pulse rate does the earth-based observer measure?

45.13 beats/min

Explanation:

Speed of space vehicle  = 0.51c

the pulse rate measured by the astronaut= 61.0 beats per minute

Pulse rate measured by the Earth observer is given by

putting vales we get

= 45.13 beats/min

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.