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I have problem with an A2 physics question:

A planet is orbiting a star at an average distance of 10^9 km. The period of its orbit is 500 Earth days. The gravitational constant is 6.67x10^-11 Nm^2kg^2.

a) Calculation the mass of the star.

b)Explain why you cannot determine the mass of the planet from this information.

answer:

I think I should use this equation:

T^2=4π^2r^3/GM

not sure how should I calculate T from 500!

r is 10^9km I suppose!

for part b I'm not sure what should I say.

I appreciate any help with this question. Many thanks

A planet is orbiting a star at an average distance of 10^9 km. The period of its orbit is 500 Earth days. The gravitational constant is 6.67x10^-11 Nm^2kg^2.

a) Calculation the mass of the star.

b)Explain why you cannot determine the mass of the planet from this information.

answer:

I think I should use this equation:

T^2=4π^2r^3/GM

not sure how should I calculate T from 500!

r is 10^9km I suppose!

for part b I'm not sure what should I say.

I appreciate any help with this question. Many thanks

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