A spaceship with a constant speed of 0.800c relative to Earth travels to a star that is 4.30 light-years from Earth. How much time for this trip would elapse on a clock on board the spaceship?

A) 3.23 y B) 5.38 y C) 4.40 y D) 5.15 y


A

Physics & Space Science

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Suppose you built a scale-model atom in which the nucleus is the size of a tennis ball. About how far would the cloud of electrons extend

A) several kilometers B) a few meters C) several centimeters D) to the Sun

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a. is not related to its relativistic momentum. b. increases with increasing relativistic momentum. c. decreases with increasing relativistic momentum. d. is a constant.

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At decoupling, the electrons and protons were made from neutron decay

Indicate whether the statement is true or false

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