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## The spaceship Lilac, based on the Purple Planet, is 721 m long when measured at rest. When the Lilac passes Earth, observers there measure i

Question

The spaceship Lilac, based on the Purple Planet, is 721 m long when measured at rest. When the Lilac passes Earth, observers there measure its length to be 661 m. At what speed v is the Lilac moving with respect to Earth? Express your answer as a multiple of the speed of light c.

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Physics
5 months
2021-09-05T08:13:40+00:00
2021-09-05T08:13:40+00:00 1 Answers
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## Answers ( )

Answer:The speed of Lilac is 0.399c.Explanation:The size of spaceship Lilac measured at the rest position = 721 m

The length of Lilac when it passes Earth = 661 m

Below is the calculation for speed at which Lilac is moving.Here, L, is the length of spaceship when it passes the earth.

is the length of spaceship measured at rest.

V is the speed.