Question
The rogue starship Galaxa is being chased by the battlecruiser Millenia. The Millenia is catching up to the Galaxa at a rate of $0.55 c$ when the captain of the Millenia decides it is time to fire a missile. First the captain shines a laser range finder to determine the distance to the Galaxa and then he fires a missile that is moving at a speed of $0.45 c$ with respect to the Millenia. What speed does the Galaxa measure for (a) the laser beam and (b) the missile as they both approach the starship?
Step 1
Therefore, the speed of the laser beam as measured by the Galaxa is the speed of light, which is $c=3.0010^{8} \mathrm{m} / \mathrm{s}$. Show more…
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The rogue starship Galaxa is being chased by the battle cruiser Millenia. The Millenia is catching up to the Galaxa at a rate of 0.55 $c$ when the captain of the Millenia decides it is time to fire a missile. First the captain shines a laser range finder to determine the distance to the Galaxa and then he fires a missile that is moving at a speed of $0.45 c$ with respect to the Millenia. What speed does the Galaxa measure for (a) the laser beam and (b) the missile as they both approach the starship?
A Klingon spacecraft moves away from the Earth at a speed of $0.800 c$ (Fig. $\mathrm{P} 39.26$ ). The starship Enterprise pursues at a speed of $0.900 c$ relative to the Earth. Observers on the Earth see the Enterprise overtaking the Klingon craft at a relative speed of $0.100 c .$ With what speed is the Enterprise overtaking the Klingon craft as seen by the crew of the Enterprise?
A Klingon space ship moves away from the Earth at a speed of $0.800 c$ (Fig. P39.25). The starship Enterprise pursues at a speed of $0.900 c$ relative to the Earth. Observers on Earth see the Enterprise overtaking the Klingon ship at a relative speed of $0.100 c$. With what speed is the Enterprise overtaking the Klingon ship as seen by the crew of the Enterprise?
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