You Are the Science Officer on a Visit to a Distant

question 74

Multiple Choice

You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 1.8 × 10⁷ m. You have previously determined that the planet orbits 2.9 × 10¹¹ m from its star with a period of 402 earth days. Once on the surface you find that the acceleration due to gravity is 19.5 m/s². What are the masses of (a) the planet and (b) the star? (G = 6.67 × 10^-11 N ? m²/kg²)

• A)(a)2.4 kg × \(10^{25}\) kg, (b)1.2 kg × \(10 ^ { 31 }\) kg
• B)(a)4.3 kg × \(10^{25}\) kg, (b)1.2 kg × \(10 ^ { 31 }\) kg
• C)(a)2.4 kg × \(10^{25}\) kg, (b)7.1 kg × \(10 ^ { 30 }\) kg
• D)(a)4.3 kg × \(10^{25}\) kg, (b)7.1 kg × \(10 ^ { 30 }\) kg

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Definitions:

Hybrid Sterility

A condition in hybrid animals or plants where they are unable to produce offspring due to genetic and chromosomal differences between the parents.

Hybrid Inviability

Hybrid inviability is a postzygotic barrier where hybrid offspring fail to survive to maturity, reducing the chances of genes being exchanged between different species.

Temporal Isolation

A mechanism of reproductive isolation in which two species breed at different times, preventing them from interbreeding.

Hybrid Breakdown

A postzygotic barrier where hybrid offspring have reduced survival or fertility rates.