Question

A planet has a circular orbit around a star. It is a distance of 98,000,000 km from the centre of the star. It orbits at an average speed of 45,000 km/h. How many Earth days does it take the planet to orbit the star? Give your answer to 2 sf.

Answer 1

91 days

Explanation:

Given that,

A planet is at a distance of 98,000,000 km from the centre of the star.

It orbits at an average speed of 45,000 km/h.

The speed of an object is given by the distance covered divided by the time taken. So,

`v=(d)/(t)\\\\t=(d)/(v)\\\\t=(98,000,000)/(45,000)\\\\t= $$2177.77\ h`

or

t = 90.74 days ≅ 91 days

So, the planet take 91 days to orbit the star.