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) a) Suppose your normal resting heart rate is 60 beats per minute. You board a space ship,
which travels away from Earth at 0.9c, going towards a star 9 light years away. While on ship,
you measure your heart rate. What will it be?
b) A spaceship has a rest mass of 500,000 tons. If you could measure its mass when it was
traveling at half the speed of light, what would it be?

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